:root {
  --bg: #f5f7fb;
  --paper: #ffffff;
  --ink: #172033;
  --muted: #667085;
  --line: #dfe5ee;
  --line-soft: #edf1f6;
  --brand: #d44b2a;
  --brand-dark: #9f2d18;
  --blue: #2563eb;
  --green: #12805c;
  --amber: #a15c07;
  --red: #b42318;
  --violet: #7357c4;
  --shadow: 0 18px 50px rgba(23, 32, 51, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Avenir Next", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    linear-gradient(135deg, rgba(212, 75, 42, 0.08), transparent 34%),
    linear-gradient(180deg, #ffffff 0, var(--bg) 360px);
  color: var(--ink);
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand-dark); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid rgba(223, 229, 238, 0.88);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
}

.brandmark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: max-content;
}

.brandmark__logo {
  width: 40px;
  height: 40px;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 7px 14px rgba(212, 75, 42, 0.22));
}

.brandmark strong,
.brandmark small {
  display: block;
  line-height: 1.1;
}

.brandmark strong {
  font-size: 17px;
  letter-spacing: 0;
}

.brandmark small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.topnav form { margin: 0; }

.topnav__group {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 0;
}

.topnav__group::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 10px;
  height: 10px;
  border-left: 1px solid rgba(223, 229, 238, 0.95);
  border-top: 1px solid rgba(223, 229, 238, 0.95);
  background: rgba(255, 255, 255, 0.98);
  transform: translateX(-50%) translateY(8px) rotate(45deg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.topnav__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  min-width: 74px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #334155;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.topnav__link:hover {
  border-color: #f0c8bc;
  background: #fff7f3;
  color: var(--brand-dark);
}

.topnav__group:hover::after,
.topnav__group:focus-within::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0) rotate(45deg);
}

.topnav__link.is-active {
  border-color: rgba(212, 75, 42, 0.22);
  background: linear-gradient(180deg, #fff8f5 0%, #fff1eb 100%);
  color: var(--brand-dark);
  box-shadow: inset 0 -1px 0 rgba(212, 75, 42, 0.08), 0 8px 20px rgba(212, 75, 42, 0.08);
}

.topnav__submenu {
  position: absolute;
  top: calc(100% - 1px);
  left: 50%;
  z-index: 30;
  display: grid;
  min-width: 168px;
  padding: 8px 0;
  border: 1px solid rgba(223, 229, 238, 0.95);
  border-radius: 12px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(250, 252, 255, 0.98));
  box-shadow: 0 18px 48px rgba(23, 32, 51, 0.14), 0 1px 0 rgba(255, 255, 255, 0.9) inset;
  transform: translateX(-50%) translateY(-6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
  backdrop-filter: blur(18px);
}

.topnav__submenu::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}

.topnav__group:hover .topnav__submenu,
.topnav__group:focus-within .topnav__submenu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.topnav__sublink {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 38px;
  padding: 0 18px 0 22px;
  border: 0;
  border-radius: 0;
  color: #475467;
  font-size: 13.5px;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
  transition: background 0.16s ease, color 0.16s ease, padding-left 0.16s ease;
}

.topnav__sublink::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 999px;
  background: currentColor;
  opacity: 0;
  transform: scaleY(0.5);
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.topnav__sublink:hover,
.topnav__sublink.is-active {
  background: linear-gradient(90deg, rgba(212, 75, 42, 0.09), transparent 78%);
  color: var(--brand-dark);
  padding-left: 25px;
}

.topnav__sublink:hover::before,
.topnav__sublink.is-active::before {
  opacity: 1;
  transform: scaleY(1);
}

.user-pill,
.version-pill {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}

.user-pill.is-active,
.user-pill:hover {
  border-color: rgba(212, 75, 42, 0.22);
  background: #fff7f3;
  color: var(--brand-dark);
}

.icon-button,
.button,
button {
  border: 0;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  padding: 9px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.button,
.icon-button { display: inline-flex; align-items: center; justify-content: center; }

.button--ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 34px 22px 70px;
}

.workspace-hero {
  min-height: 190px;
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: end;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(120deg, rgba(212, 75, 42, 0.14), rgba(255, 255, 255, 0.72) 34%),
    #fff;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.workspace-hero h1 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.1;
}

.workspace-hero p {
  max-width: 680px;
  margin: 12px 0 0;
  color: var(--muted);
}

.workspace-stat {
  min-width: 136px;
  padding: 16px;
  border-left: 3px solid var(--brand);
  background: rgba(255, 255, 255, 0.72);
}

.workspace-stat strong {
  display: block;
  font-size: 36px;
  line-height: 1;
}

.workspace-stat span { color: var(--muted); font-size: 13px; }

.lesson-filters {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 12px 34px rgba(23, 32, 51, 0.05);
}

.lesson-filters__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.lesson-filters__head strong,
.lesson-filters__head span {
  display: block;
}

.lesson-filters__head strong {
  font-size: 16px;
  line-height: 1.3;
}

.lesson-filters__head span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.lesson-filter-form {
  display: grid;
  grid-template-columns: repeat(5, minmax(126px, 1fr)) auto;
  gap: 10px;
  align-items: end;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.lesson-filter-form label {
  display: grid;
  gap: 6px;
}

.lesson-filter-form label span {
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.lesson-filter-form select {
  min-height: 42px;
  margin: 0;
}

.lesson-filter-form button {
  min-height: 42px;
  padding-inline: 18px;
  background: var(--brand);
  white-space: nowrap;
}

.lesson-list { margin-top: 20px; display: grid; gap: 12px; }

.lesson-row {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(160px, 300px) auto;
  gap: 18px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.lesson-row__main a {
  display: inline-block;
  font-size: 18px;
  font-weight: 800;
}

.lesson-row__meta,
.lesson-row__tags,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 8px;
}

.lesson-row__meta span,
.lesson-row__tags span,
.tag-row span,
.meta-grid span {
  padding: 4px 8px;
  border-radius: 6px;
  background: #f2f5f9;
  color: var(--muted);
  font-size: 12px;
}

.lesson-row__actions { display: flex; gap: 8px; align-items: center; justify-content: end; }

.empty-state,
.panel {
  margin-top: 20px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

/* ============================================================
   Question Bank — Document Conversion Workbench
   Clean SaaS surface · bento layout · status clarity · a11y
   ============================================================ */
.qb-shell {
  --qb-radius: 10px;
  --qb-radius-lg: 14px;
  --qb-edge: #e6eaf1;
  --qb-edge-soft: #eef2f7;
  --qb-surface: #ffffff;
  --qb-tint: #f7f9fc;
  --qb-shadow-sm: 0 1px 2px rgba(23, 32, 51, 0.04), 0 6px 16px rgba(23, 32, 51, 0.045);
  --qb-shadow-md: 0 14px 36px rgba(23, 32, 51, 0.07);
  width: min(100%, 1240px);
  margin: 0 auto;
  padding: 22px 22px 56px;
}
.qb-shell--review { width: min(100%, 1400px); }

.qb-shell svg {
  display: block;
  flex: 0 0 auto;
  max-width: 100%;
  max-height: 100%;
}

/* ---------- Buttons ---------- */
.qb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 40px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: var(--qb-radius);
  background: var(--ink);
  color: #fff;
  font: inherit;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .12s ease, box-shadow .18s ease;
}
.qb-btn svg { width: 16px; height: 16px; flex: 0 0 auto; }
.qb-btn--primary { background: var(--brand); box-shadow: 0 8px 20px rgba(212, 75, 42, 0.22); }
.qb-btn--primary:hover { background: var(--brand-dark); color: #fff; }
.qb-btn--ghost {
  background: #fff;
  color: var(--ink);
  border-color: var(--qb-edge);
  box-shadow: var(--qb-shadow-sm);
}
.qb-btn--ghost:hover {
  color: var(--brand-dark);
  border-color: color-mix(in srgb, var(--brand) 38%, var(--qb-edge));
  background: #fffaf7;
}
.qb-btn--danger { background: #b42318; color: #fff; box-shadow: 0 8px 20px rgba(180, 35, 24, 0.16); }
.qb-btn--danger:hover { background: #912018; color: #fff; }
.qb-btn.is-error {
  border-color: #f0b8ae;
  background: #fff4f2;
  color: var(--red);
}
.qb-btn--sm { min-height: 34px; padding: 6px 12px; font-size: 13px; }
.qb-btn--lg { min-height: 46px; padding: 12px 22px; font-size: 15px; }
.qb-btn--lg svg { width: 18px; height: 18px; }
.qb-btn--block { width: 100%; }
.qb-btn:disabled { opacity: 0.55; cursor: wait; }
.qb-btn:active { transform: translateY(1px); }

/* ---------- Hero / command bar ---------- */
.qb-hero {
  display: flex;
  flex-wrap: wrap;
  gap: 22px 28px;
  align-items: center;
  justify-content: space-between;
  padding: 26px 28px;
  margin-bottom: 18px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(212, 75, 42, 0.13), transparent 46%),
    linear-gradient(180deg, #ffffff, #fffaf7);
  box-shadow: var(--qb-shadow-md);
}
.qb-hero__lead { min-width: min(100%, 300px); flex: 1 1 320px; }
.qb-hero__lead .eyebrow { margin: 0 0 8px; }
.qb-hero__title { margin: 0; font-size: clamp(24px, 2.4vw, 32px); line-height: 1.15; letter-spacing: -0.01em; }
.qb-hero__desc { margin: 10px 0 0; max-width: 62ch; color: var(--muted); font-size: 14.5px; }
.qb-hero__side {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 16px;
  justify-content: flex-end;
}
.qb-hero__stats { display: flex; flex-wrap: wrap; gap: 10px; }
.qb-stat {
  min-width: 96px;
  padding: 12px 16px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(6px);
}
.qb-stat strong { display: block; font-size: 24px; line-height: 1; font-variant-numeric: tabular-nums; }
.qb-stat span { display: block; margin-top: 5px; color: var(--muted); font-size: 12.5px; }
.qb-stat--ok strong { color: var(--green); }
.qb-stat--busy strong { color: var(--blue); }
.qb-stat--review strong { color: #a15c07; }
.qb-stat--failed strong { color: var(--red); }

/* ---------- Card primitive ---------- */
.qb-card {
  overflow: hidden;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background: var(--qb-surface);
  box-shadow: var(--qb-shadow-sm);
}
.qb-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--qb-edge-soft);
}
.qb-card__head h2 { margin: 0; font-size: 16px; line-height: 1.25; }
.qb-card__head > div > span { display: block; margin-top: 3px; color: var(--muted); font-size: 12.5px; }

.qb-status-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--qb-edge-soft);
}

.qb-status-filter__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--qb-edge);
  border-radius: 999px;
  background: #fff;
  color: #556173;
  font-size: 12.5px;
  font-weight: 900;
  text-decoration: none;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}

.qb-status-filter__item:hover {
  border-color: color-mix(in srgb, var(--brand) 32%, var(--qb-edge));
  color: var(--brand-dark);
}

.qb-status-filter__item.is-active {
  border-color: var(--brand);
  background: #fff6f0;
  color: var(--brand-dark);
}

.list-page-size-form {
  margin-left: auto;
}

.list-page-size-form label,
.compact-select {
  display: grid;
  gap: 5px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.list-page-size-form select,
.compact-select select {
  min-height: 32px;
  padding: 5px 28px 5px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
}

.list-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 13px;
}

.list-pagination__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.is-disabled {
  pointer-events: none;
  opacity: .48;
}

/* ---------- Workspace (list) ---------- */
.qb-workspace {
  display: grid;
  grid-template-columns: minmax(300px, 340px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

/* ---------- Upload panel ---------- */
.qb-upload { position: sticky; top: 82px; }
.qb-upload__form { display: grid; gap: 12px; padding: 18px; }
.qb-dropzone {
  position: relative;
  display: grid;
  place-items: center;
  gap: 10px;
  min-height: 168px;
  padding: 22px 18px;
  border: 1.5px dashed #cdd6e3;
  border-radius: var(--qb-radius);
  background: linear-gradient(180deg, #fff, #fbfcfe);
  color: var(--ink);
  cursor: pointer;
  text-align: center;
  transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
.qb-dropzone:hover,
.qb-dropzone.is-dragging {
  border-color: var(--brand);
  background: #fff6f2;
  box-shadow: inset 0 0 0 3px rgba(212, 75, 42, 0.08);
}
.qb-dropzone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.qb-dropzone__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--ink);
  color: #fff;
}
.qb-dropzone__icon svg { width: 22px; height: 22px; }
.qb-dropzone__text { display: grid; gap: 3px; }
.qb-dropzone__text strong { font-size: 14.5px; }
.qb-dropzone__text small {
  max-width: 240px;
  overflow: hidden;
  color: var(--muted);
  font-size: 12.5px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Pipeline stepper ---------- */
.qb-pipeline { list-style: none; margin: 0; padding: 16px 18px 20px; }
.qb-pipeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 12px;
  padding: 4px 0 16px;
}
.qb-pipeline__item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 30px;
  bottom: 0;
  width: 2px;
  background: var(--qb-edge);
}
.qb-pipeline__item:last-child { padding-bottom: 0; }
.qb-pipeline__item:last-child::before { display: none; }
.qb-pipeline__no {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 2px solid var(--qb-edge);
  border-radius: 50%;
  background: #fff;
  color: #7a8499;
  font-size: 13px;
  font-weight: 800;
  z-index: 1;
}
.qb-pipeline__body strong { display: block; font-size: 13.5px; color: var(--ink); }
.qb-pipeline__body span { display: block; color: var(--muted); font-size: 12px; }

/* ---------- Jobs table ---------- */
.qb-jobs__scroll { overflow-x: auto; }
.qb-table { width: 100%; border-collapse: collapse; min-width: 900px; table-layout: fixed; }
.qb-table thead th {
  padding: 12px 16px;
  text-align: left;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
  background: var(--qb-tint);
  border-bottom: 1px solid var(--qb-edge-soft);
}
.qb-table tbody td {
  padding: 14px 16px;
  vertical-align: top;
  background: #fff;
  border-bottom: 1px solid var(--qb-edge-soft);
}
.qb-table__row { transition: background .15s ease; }
.qb-table__row:hover td { background: #fffaf7; }
.qb-table__row:last-child td { border-bottom: 0; }
.qb-file-list {
  display: grid;
  gap: 5px;
}
.qb-file-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 7px;
  max-width: 360px;
}
.qb-file-item span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 20px;
  border-radius: 6px;
  background: #eef4ff;
  color: #315c9f;
  font-size: 11px;
  font-weight: 800;
}
.qb-file-item:nth-child(2) span {
  background: #fff0e8;
  color: #a64e1d;
}
.qb-table__file strong {
  display: block;
  min-width: 0;
  overflow: hidden;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-overflow: ellipsis;
  white-space: nowrap;
}
.qb-table__file code { display: block; margin-top: 3px; color: var(--muted); font-size: 11.5px; }
.qb-table__time { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.qb-table thead th:nth-child(1) { width: 32%; }
.qb-table thead th:nth-child(2) { width: 96px; }
.qb-table thead th:nth-child(3) { width: 260px; }
.qb-table thead th:nth-child(4) { width: 140px; }
.qb-table thead th:nth-child(5) { width: 236px; text-align: right; }
.qb-table tbody td:nth-child(5) { text-align: right; }
.qb-row-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 7px;
}
.qb-row-actions .qb-btn { min-width: 62px; }

/* ---------- Status pill (color + dot + text) ---------- */
.qb-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: #eef2f7;
  color: #475467;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}
.qb-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.9;
}
.qb-status--pending { background: #f2f4f7; color: #646e81; }
.qb-status--running { background: #eaf2ff; color: var(--blue); }
.qb-status--pending_review { background: #fff6df; color: #a15c07; }
.qb-status--reviewed { background: #e7f6ef; color: var(--green); }
.qb-status--failed { background: #fdece9; color: var(--red); }
.qb-status--cancelled { background: #f2f4f7; color: #8a93a4; }
.qb-status--deleted { background: #f2f4f7; color: #8a93a4; }
.qb-status--running::before { animation: qb-pulse 1.1s ease-in-out infinite; }

/* ---------- Progress bar ---------- */
.qb-progress {
  position: relative;
  width: min(220px, 100%);
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: #eef2f7;
}
.qb-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--brand), #f0916b);
  transition: width .4s ease;
}
.qb-progress__step { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; }

/* ---------- Pills & tags ---------- */
.qb-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border: 1px solid var(--qb-edge);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
}
.qb-tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 9px;
  border-radius: 6px;
  background: #eef2f7;
  color: #475467;
  font-size: 12px;
  font-weight: 800;
}
.qb-tag--brand { background: #fff0ea; color: var(--brand-dark); }

/* ---------- Empty / in-progress states ---------- */
.qb-empty {
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 56px 24px;
  text-align: center;
}
.qb-empty__icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  min-width: 56px;
  flex: 0 0 56px;
  margin-bottom: 4px;
  overflow: hidden;
  border-radius: 16px;
  background: linear-gradient(180deg, #fff5f1, #fde7dd);
  color: var(--brand);
  contain: layout paint;
}
.qb-empty__icon svg {
  width: 28px;
  height: 28px;
  min-width: 28px;
  max-width: 28px;
  min-height: 28px;
  max-height: 28px;
}
.qb-empty h2 { margin: 0; font-size: 17px; }
.qb-empty p { margin: 0; max-width: 44ch; color: var(--muted); font-size: 13.5px; }
.qb-spinner {
  width: 40px;
  height: 40px;
  margin-bottom: 4px;
  border: 3px solid #f3e0d8;
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: qb-spin 0.9s linear infinite;
}

/* ---------- Review header ---------- */
.qb-review-head {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: flex-end;
  justify-content: space-between;
  padding: 22px 24px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background: linear-gradient(120deg, rgba(212, 75, 42, 0.08), transparent 42%), #fff;
  box-shadow: var(--qb-shadow-md);
}
.qb-review-head__lead { min-width: 0; }
.qb-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 8px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 800;
}
.qb-back svg { width: 16px; height: 16px; }
.qb-review-head__lead h1 { margin: 0; font-size: clamp(20px, 2.2vw, 28px); line-height: 1.2; word-break: break-word; }
.qb-review-head__lead p { margin: 8px 0 0; max-width: 72ch; color: var(--muted); font-size: 14px; }
.qb-review-head__actions { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; }
.qb-review-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; }
.qb-review-meta code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.qb-error {
  max-height: 220px;
  overflow: auto;
  margin: 14px 0 0;
  padding: 12px 14px;
  border: 1px solid #ffd7d2;
  border-radius: var(--qb-radius);
  background: #fff8f7;
  color: var(--red);
  font-size: 12.5px;
  white-space: pre-wrap;
}

/* feedback line (upload / save / publish) */
.qb-feedback { margin: 0; min-height: 1em; color: var(--muted); font-size: 13px; }
.qb-feedback.is-error { color: var(--red); font-weight: 700; }
.qb-feedback.is-success { color: var(--green); font-weight: 700; }

/* ---------- Review workspace ---------- */
.qb-review-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 460px);
  gap: 16px;
  align-items: start;
  margin-top: 16px;
}
.qb-review-main { min-width: 0; display: grid; gap: 14px; }

/* bento summary */
.qb-bento { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.qb-bento__cell {
  padding: 16px 18px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius);
  background: #fff;
  box-shadow: var(--qb-shadow-sm);
}
.qb-bento__cell strong { display: block; font-size: 24px; line-height: 1.1; font-variant-numeric: tabular-nums; }
.qb-bento__cell span { display: block; margin-top: 4px; color: var(--muted); font-size: 12.5px; }
.qb-bento__cell--accent { border-left: 3px solid var(--brand); }

.qb-source-editor {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background: #fff;
  box-shadow: var(--qb-shadow-sm);
}
.qb-source-editor__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.qb-source-editor__head h2 { margin: 0; font-size: 15px; }
.qb-source-editor__head p { margin: 4px 0 0; color: var(--muted); font-size: 12.5px; }
.qb-source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.qb-source-grid label { display: grid; gap: 5px; min-width: 0; }
.qb-source-grid span { color: #667085; font-size: 11.5px; font-weight: 800; }
.qb-source-grid input {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--qb-edge);
  border-radius: 7px;
  background: var(--qb-tint);
  font-size: 13px;
}

/* ---------- Question cards ---------- */
.qb-questions { display: grid; gap: 14px; }
.qb-q {
  overflow: hidden;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background: #fff;
  box-shadow: var(--qb-shadow-sm);
  transition: box-shadow .18s ease;
}
.qb-q:hover { box-shadow: var(--qb-shadow-md); }
.qb-q__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--qb-edge-soft);
  background: linear-gradient(180deg, #fff, #fbfcfe);
}
.qb-q__id { display: flex; align-items: center; gap: 10px; min-width: 0; flex-wrap: wrap; }
.qb-q__no {
  display: grid;
  place-items: center;
  min-width: 32px;
  height: 28px;
  padding: 0 8px;
  border-radius: 7px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}
.qb-q__origin {
  display: inline-flex;
  align-items: center;
  max-width: min(260px, 42vw);
  height: 28px;
  padding: 0 9px;
  border: 1px solid var(--qb-edge);
  border-radius: 7px;
  background: #f7f9fc;
  color: #475467;
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.qb-q__conf { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 700; color: var(--muted); white-space: nowrap; }
.qb-q__conf::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--c, #98a2b3); }
.qb-q__conf--good { color: var(--green); --c: var(--green); }
.qb-q__conf--warn { color: var(--amber); --c: var(--amber); }
.qb-q__conf--low { color: var(--red); --c: var(--red); }
.qb-q__head-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 12px; }
.qb-q__delete {
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid #f2b8b5;
  border-radius: 7px;
  background: #fff7f7;
  color: #b42318;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
}
.qb-q__delete:hover { border-color: #d92d20; background: #fef3f2; }
.qb-q__delete:focus-visible { outline: 2px solid #d92d20; outline-offset: 2px; }
.qb-q__body { display: grid; gap: 14px; padding: 16px 18px; }
.qb-q__field h3 { margin: 0 0 5px; font-size: 11.5px; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; color: #97a1b3; }
.qb-q__field p { margin: 0; white-space: pre-wrap; font-size: 14.5px; line-height: 1.72; color: #293449; }
.qb-q__field--answer p { color: #14462f; }
.qb-q__images { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; padding: 0 18px 16px; }
.qb-q__images:empty { display: none; }
.qb-image-tile {
  display: grid;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius);
  background: var(--qb-tint);
  transition: border-color .15s ease, transform .15s ease;
}
.qb-image-tile:hover { border-color: color-mix(in srgb, var(--brand) 40%, var(--qb-edge)); transform: translateY(-1px); }
.qb-image-tile img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; border-radius: 6px; background: #fff; }
.qb-image-tile span { color: var(--muted); font-size: 11.5px; text-align: center; }
.qb-warns { display: grid; gap: 8px; padding: 0 18px 16px; }
.qb-warns > span {
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  padding: 9px 12px;
  border-left: 3px solid #d88a22;
  border-radius: 8px;
  background: #fff8ed;
  color: #8d4e08;
  font-size: 13px;
  font-weight: 650;
  line-height: 1.65;
  white-space: normal;
  overflow-wrap: break-word;
}
.qb-warns .katex {
  white-space: nowrap;
  font-size: 1em;
}
.qb-warns .katex-display {
  max-width: 100%;
  margin: 6px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---------- Question bank management ---------- */
.qb-manage { width: min(100%, 1280px); }
.qb-manage .qb-card + .qb-card { margin-top: 16px; }
.qb-manage-filter {
  position: relative;
  z-index: 12;
  overflow: visible;
  margin-bottom: 16px;
}
.qb-question-list {
  position: relative;
  z-index: 1;
}
.qb-question-filter-form {
  display: grid;
  grid-template-columns: minmax(120px, 0.75fr) minmax(120px, 0.75fr) minmax(220px, 2fr) minmax(96px, 0.55fr) auto;
  gap: 10px;
  align-items: end;
  padding: 16px 18px 18px;
}
.qb-question-filter-form--wide {
  grid-template-columns: minmax(220px, 1.45fr) minmax(108px, 0.7fr) minmax(108px, 0.7fr) minmax(220px, 1.7fr) minmax(100px, 0.65fr) minmax(116px, 0.72fr) minmax(82px, 0.5fr) auto;
}
.qb-question-filter-form__similar-sort { min-width: 116px; }
.qb-question-filter-form label,
.qb-question-filter-field {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.qb-question-filter-form > label > span,
.qb-question-filter-field > span {
  color: #667085;
  font-size: 11.5px;
  font-weight: 900;
}
.qb-question-filter-form select,
.qb-question-filter-form input[type="search"],
.qb-edit-field select,
.qb-edit-field textarea {
  width: 100%;
  min-height: 40px;
  padding: 8px 34px 8px 11px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
}
.qb-question-filter-form input[type="search"] {
  padding-right: 11px;
}
.qb-source-file-picker {
  position: relative;
  min-width: 0;
}
.qb-source-file-picker__control {
  position: relative;
  display: flex;
  align-items: center;
}
.qb-source-file-picker__control > svg {
  position: absolute;
  left: 11px;
  z-index: 1;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: #7b8798;
  stroke-width: 1.8;
  pointer-events: none;
}
.qb-question-filter-form .qb-source-file-picker__control input[type="search"] {
  padding-right: 34px;
  padding-left: 35px;
}
.qb-source-file-picker__control > button {
  position: absolute;
  right: 7px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #7b8798;
  font-size: 18px;
  cursor: pointer;
}
.qb-source-file-picker__control > button:hover { background: #f1f4f8; color: #344054; }
.qb-source-file-picker.is-open .qb-source-file-picker__control input {
  border-color: #d97555;
  box-shadow: 0 0 0 3px rgba(212, 75, 42, 0.11);
}
.qb-source-file-picker__panel {
  position: absolute;
  top: calc(100% + 7px);
  right: auto;
  left: 0;
  z-index: 30;
  width: min(560px, calc(100vw - 56px));
  max-height: 300px;
  overflow-y: auto;
  padding: 6px;
  border: 1px solid #d9e0e9;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 42px rgba(34, 47, 66, 0.18);
  backdrop-filter: blur(10px);
}
.qb-source-file-picker__option {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  padding: 10px 11px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #29374b;
  text-align: left;
  cursor: pointer;
}
.qb-source-file-picker__option:hover,
.qb-source-file-picker__option.is-active { background: #fff1eb; color: #8b351f; }
.qb-source-file-picker__option strong {
  overflow: hidden;
  font-size: 13px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.qb-source-file-picker__option span {
  padding: 3px 7px;
  border-radius: 999px;
  background: #eef2f6;
  color: #667085;
  font-size: 11px;
  font-weight: 850;
  white-space: nowrap;
}
.qb-source-file-picker__empty { margin: 0; padding: 14px 11px; color: #7b8798; font-size: 12.5px; }
.qb-source-file-picker__empty.is-error { color: #b42318; }
.qb-source-file-picker__hint { min-height: 17px; color: #8a94a4; font-size: 11px; line-height: 1.45; }
.qb-source-file-picker__hint.is-selected { color: #28745a; font-weight: 800; }
.qb-source-file-picker__hint.is-error { color: #b42318; font-weight: 800; }
.qb-edit-field textarea {
  min-height: 92px;
  padding: 10px 12px;
  line-height: 1.65;
  resize: vertical;
}
.qb-render-field {
  position: relative;
  min-height: 58px;
  padding: 13px 14px;
  border: 1px solid #edf1f6;
  border-radius: var(--qb-radius);
  background:
    linear-gradient(180deg, #ffffff, #fbfcfe);
  color: #263349;
  font-size: 14.5px;
  line-height: 1.8;
  white-space: pre-wrap;
  cursor: text;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}
.qb-render-field:hover {
  border-color: rgba(212, 75, 42, 0.25);
  background: #fffdfb;
}
.qb-render-field:empty::before {
  content: "未填写";
  color: #98a2b3;
}
.qb-render-field em {
  position: absolute;
  right: 10px;
  top: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: #fff7f3;
  color: var(--brand-dark);
  font-size: 11px;
  font-style: normal;
  font-weight: 900;
  opacity: 0;
  transition: opacity 0.16s ease;
}
.qb-render-field:hover em,
.qb-render-field:focus-visible em {
  opacity: 1;
}
.qb-render-edit.is-editing .qb-render-field { display: none; }
.qb-render-edit.is-editing textarea[hidden] { display: block; }
.qb-edit-field textarea:disabled,
.qb-edit-field select:disabled {
  color: #475467;
  background: #f8fafc;
  cursor: default;
}
.qb-tag-filter {
  position: relative;
  min-width: 0;
}
.qb-tag-filter::before,
.qb-tag-filter::after {
  position: absolute;
  z-index: 48;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .15s ease, transform .15s ease;
}
.qb-tag-filter::before {
  content: "";
  left: 24px;
  top: calc(100% + 3px);
  border: 6px solid transparent;
  border-bottom-color: #25364d;
}
.qb-tag-filter::after {
  content: attr(data-full-label);
  left: 0;
  top: calc(100% + 14px);
  width: max-content;
  max-width: min(520px, calc(100vw - 32px));
  padding: 10px 13px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 9px;
  background: #25364d;
  color: #fff;
  box-shadow: 0 12px 28px rgba(24,36,52,.22);
  font-size: 12.5px;
  font-weight: 750;
  line-height: 1.55;
  white-space: normal;
}
.qb-tag-filter.is-truncated:not(.is-open):hover::before,
.qb-tag-filter.is-truncated:not(.is-open):hover::after,
.qb-tag-filter.is-truncated:not(.is-open):focus-within::before,
.qb-tag-filter.is-truncated:not(.is-open):focus-within::after {
  opacity: 1;
  transform: translateY(0);
}
.qb-tag-filter__trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 40px;
  padding: 8px 10px 8px 12px;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius);
  background: linear-gradient(180deg, #ffffff, #fbfcfe);
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
}
.qb-tag-filter__trigger span {
  min-width: 0;
  overflow: hidden;
  color: #344054;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.qb-tag-filter__trigger.has-value span { color: var(--brand-dark); }
.qb-tag-filter__trigger svg {
  color: #7a8499;
  transition: transform .16s ease;
}
.qb-tag-filter.is-open .qb-tag-filter__trigger {
  border-color: rgba(212, 75, 42, 0.38);
  box-shadow: 0 0 0 3px rgba(212, 75, 42, 0.11);
}
.qb-tag-filter.is-open .qb-tag-filter__trigger svg { transform: rotate(180deg); }
.qb-tag-filter__panel {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 6px);
  z-index: 35;
  overflow: hidden;
  border: 1px solid rgba(223, 229, 238, 0.96);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 20px 48px rgba(23, 32, 51, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}
.qb-tag-filter__search {
  position: relative;
  border-bottom: 1px solid var(--qb-edge-soft);
  background: #fbfcfe;
}
.qb-tag-filter__search input {
  width: 100%;
  min-height: 42px;
  padding: 9px 38px 9px 12px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  outline: 0;
}
.qb-tag-filter__search input::-webkit-search-cancel-button,
.qb-tag-filter__search input::-webkit-search-decoration {
  appearance: none;
  -webkit-appearance: none;
}
.qb-tag-filter__search button {
  position: absolute;
  right: 8px;
  top: 9px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: #eef2f7;
  color: #667085;
  cursor: pointer;
  line-height: 1;
}
.qb-tag-filter__search button:hover {
  background: #fee2e2;
  color: #b42318;
}
.qb-tag-filter__tree {
  max-height: min(360px, 48vh);
  overflow: auto;
  padding: 6px 0;
}
.qb-tag-filter__row {
  --depth: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  width: 100%;
  min-height: 38px;
  padding: 6px 12px 6px calc(12px + var(--depth) * 18px);
  border: 0;
  border-left: 3px solid transparent;
  background: transparent;
  color: #273449;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.qb-tag-filter__row:hover {
  border-left-color: rgba(212, 75, 42, 0.45);
  background: #fffaf7;
}
.qb-tag-filter__row.is-selected {
  border-left-color: var(--brand);
  background: #fff3ed;
}
.qb-tag-filter__row.is-branch {
  cursor: default;
  opacity: 0.76;
}
.qb-tag-filter__row span {
  overflow: hidden;
  font-size: 13.5px;
  font-weight: 850;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.qb-tag-filter__row small {
  overflow: hidden;
  color: #7a8499;
  font-size: 11.5px;
  font-weight: 700;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.qb-tag-filter__row mark {
  padding: 0 2px;
  border-radius: 3px;
  background: #fff0a6;
  color: inherit;
}
.qb-tag-filter__empty {
  padding: 18px 14px;
  color: var(--muted);
  font-size: 13px;
}
.qb-question-list__items { display: grid; }
.qb-question-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 15px 18px;
  border-bottom: 1px solid var(--qb-edge-soft);
  background:
    linear-gradient(90deg, rgba(212, 75, 42, 0), rgba(212, 75, 42, 0));
  transition: background .16s ease, color .16s ease, box-shadow .16s ease;
}
.qb-question-row:last-child { border-bottom: 0; }
.qb-question-row:hover {
  background:
    linear-gradient(90deg, rgba(212, 75, 42, 0.07), rgba(212, 75, 42, 0.015) 42%, transparent 100%);
  color: inherit;
  box-shadow: inset 3px 0 0 rgba(212, 75, 42, 0.72);
}
.qb-question-row__no {
  display: grid;
  place-items: center;
  width: 42px;
  height: 34px;
  padding: 0 7px;
  border-radius: 8px;
  background: #f1f5f9;
  color: #334155;
  font-size: 12.5px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}
.qb-question-row__main {
  display: grid;
  gap: 6px;
  min-width: 0;
}
.qb-question-row__main strong {
  color: #273449;
  font-size: 14.5px;
  font-weight: 800;
  line-height: 1.7;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.qb-question-row__figures {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.qb-question-row__figures a {
  display: block;
  width: min(180px, 100%);
  padding: 5px;
  border: 1px solid #e2e8f0;
  border-radius: 9px;
  background: #fff;
}
.qb-question-row__figures img {
  display: block;
  width: 100%;
  max-height: 150px;
  object-fit: contain;
}
.qb-question-row__main small {
  overflow: hidden;
  color: var(--muted);
  font-size: 12.5px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.qb-question-row__source {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  max-width: min(100%, 720px);
  min-height: 26px;
  padding: 3px 10px;
  border: 1px solid #e7edf5;
  border-radius: 7px;
  background: linear-gradient(180deg, #fbfcfe, #f6f8fb);
  color: #536176;
  font-size: 12.5px;
  font-weight: 750;
  line-height: 1.45;
  letter-spacing: 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.92);
}
.qb-question-row:hover .qb-question-row__no {
  background: #fff1eb;
  color: var(--brand-dark);
}
.qb-question-row:hover .qb-question-row__source {
  border-color: #f0c8bc;
  background: #fffaf7;
  color: #7a3d2a;
}
.qb-question-row__meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  min-width: 210px;
  flex-wrap: wrap;
}
.qb-question-row__meta em,
.qb-question-row__meta b {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 12px;
  font-style: normal;
  font-weight: 900;
  white-space: nowrap;
}
.qb-question-row__meta em { background: #fff3e8; color: var(--brand-dark); }
.qb-question-row__meta b { border: 1px solid var(--qb-edge); color: #475467; }
.qb-row-action { display:inline-flex; align-items:center; gap:6px; min-height:34px; padding:0 11px; border:1px solid #d8dee8; border-radius:9px; background:#fff; color:#475569; font-size:12px; font-weight:850; cursor:pointer; transition:.16s ease; }
.qb-row-action svg { width:15px; height:15px; fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }
.qb-row-action:hover { border-color:#aeb9c8; background:#f7f9fc; color:#243247; transform:translateY(-1px); }
.qb-row-action--relation { border-color:#efc5b7; background:#fff8f4; color:var(--brand-dark); }
.qb-row-action--relation:hover { border-color:var(--brand); background:#fff0e9; }
.qb-feedback.is-leaving { opacity:0; transform:translateY(-5px); transition:opacity .35s ease,transform .35s ease; }
.qb-sim-modal[hidden] { display: none; }
.qb-sim-modal { position: fixed; inset: 0; z-index: 1200; display: grid; place-items: center; padding: 28px; }
.qb-sim-modal__backdrop { position: absolute; inset: 0; background: rgba(21, 28, 38, .62); backdrop-filter: blur(5px); }
.qb-sim-modal__dialog {
  position: relative;
  display: flex;
  flex-direction: column;
  width: min(1120px, 96vw);
  max-height: min(880px, 92vh);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 18px;
  background: #f7f4ee;
  box-shadow: 0 28px 90px rgba(10, 18, 28, .34);
}
.qb-sim-modal__head { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; background: #233246; color: #fff; }
.qb-sim-modal__head span { color: #f1a27d; font-size: 10px; font-weight: 900; letter-spacing: .18em; }
.qb-sim-modal__head h2 { margin: 3px 0 0; font-size: 21px; }
.qb-sim-modal__close { display:grid; place-items:center; width:40px; height:40px; padding:0; border:1px solid rgba(255,255,255,.25); border-radius:50%; background:rgba(255,255,255,.04); color:#fff; cursor:pointer; transition:.16s ease; }
.qb-sim-modal__close svg { width:18px; height:18px; fill:none; stroke:currentColor; stroke-width:2; stroke-linecap:round; }
.qb-sim-modal__close:hover { border-color:rgba(255,255,255,.58); background:rgba(255,255,255,.12); transform:rotate(4deg); }
.qb-sim-modal__seed { padding: 16px 24px; border-bottom: 1px solid #ddd6ca; background: #fffdf9; }
.qb-sim-modal__seed b { color: var(--brand-dark); font-size: 11px; letter-spacing: .08em; }
.qb-sim-modal__seed .qb-sim-rendered { margin: 6px 0; color: #243247; font-size: 14px; font-weight: 800; line-height: 1.65; }
.qb-sim-modal__seed span { color: var(--muted); font-size: 12px; }
.qb-sim-modal__seed.qb-has-figures { display:grid; grid-template-columns:minmax(0,1fr) minmax(240px,320px); grid-template-rows:auto 1fr auto; column-gap:28px; align-items:start; }
.qb-sim-modal__seed.qb-has-figures > b,
.qb-sim-modal__seed.qb-has-figures > .qb-sim-rendered,
.qb-sim-modal__seed.qb-has-figures > span { grid-column:1; }
.qb-sim-modal__seed.qb-has-figures > .qb-sim-figures { grid-column:2; grid-row:1 / 4; align-self:center; margin:0; }
.qb-sim-modal__content { overflow: auto; padding: 18px 24px 24px; }
.qb-sim-modal__relations { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
.qb-relation-stat { position:relative; display:grid; grid-template-columns:minmax(0,1fr) auto; gap:10px 20px; min-height:150px; padding:20px; overflow:hidden; border:1px solid #ded7cc; border-radius:14px; background:#fff; box-shadow:0 4px 16px rgba(35,50,70,.05); }
.qb-relation-stat::before { content:""; position:absolute; inset:0 auto 0 0; width:4px; background:#ef7f54; }
.qb-relation-stat--indirect::before { background:#71849c; }
.qb-relation-stat small { color:#a85a3d; font-size:9px; font-weight:950; letter-spacing:.15em; }
.qb-relation-stat--indirect small { color:#60758e; }
.qb-relation-stat h3 { margin:8px 0 4px; color:#26364a; font-size:17px; }
.qb-relation-stat p { margin:0; color:var(--muted); font-size:12px; }
.qb-relation-stat strong { color:#233246; font-size:42px; font-variant-numeric:tabular-nums; line-height:1; }
.qb-relation-stat button { grid-column:1/-1; display:inline-flex; align-items:center; justify-content:center; gap:6px; width:fit-content; min-height:34px; padding:0 13px; border:0; border-radius:8px; background:#233246; color:#fff; font-size:12px; font-weight:850; cursor:pointer; }
.qb-relation-stat button svg { width:14px; height:14px; fill:none; stroke:currentColor; stroke-width:2; }
.qb-relation-stat button:hover { background:#31445d; }
.qb-relation-stat button:disabled { background:#d6d8dc; color:#8a929e; cursor:not-allowed; }
.qb-sim-modal__section { min-width: 0; }
.qb-sim-modal__section h3 { display: flex; gap: 8px; align-items: center; margin: 0 0 10px; font-size: 14px; }
.qb-sim-modal__section h3 span { display: grid; place-items: center; min-width: 23px; height: 23px; border-radius: 99px; background: #e7e0d5; font-size: 11px; }
.qb-sim-card { display:grid; gap:10px; padding:14px; border:1px solid #ded7cc; border-radius:12px; background:#fff; transition:border-color .15s ease,box-shadow .15s ease; }
.qb-sim-card:hover { border-color:#c8b8a8; box-shadow:0 6px 18px rgba(35,50,70,.08); }
.qb-sim-card + .qb-sim-card { margin-top: 8px; }
.qb-sim-rendered { margin:0; color:#26364a; font-size:13px; font-weight:750; line-height:1.65; white-space:pre-wrap; overflow-wrap:anywhere; }
.qb-sim-rendered .katex-display { max-width:100%; margin:.45em 0; overflow-x:auto; overflow-y:hidden; }
.qb-sim-figures { display:flex; flex-wrap:wrap; gap:8px; margin-top:9px; }
.qb-sim-figures a { display:grid; place-items:center; width:min(220px,100%); min-height:100px; padding:6px; border:1px solid #e1ddd5; border-radius:9px; background:#faf9f6; }
.qb-sim-figures img { display:block; width:100%; max-height:180px; object-fit:contain; }
.qb-sim-card small { color: var(--muted); }
.qb-sim-card form { margin: 0; }
.qb-sim-card__actions,.qb-relation-item__actions { display:flex; align-items:center; justify-content:flex-end; gap:8px; }
.qb-icon-action,.qb-add-action,.qb-remove-action,.qb-refresh-action,.qb-back-action { display:inline-flex; align-items:center; justify-content:center; gap:6px; min-height:34px; padding:0 11px; border:1px solid #d7dee8; border-radius:8px; background:#fff; color:#42536a; font-size:12px; font-weight:850; cursor:pointer; }
.qb-icon-action svg,.qb-add-action svg,.qb-remove-action svg,.qb-refresh-action svg,.qb-back-action svg { width:15px; height:15px; fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }
.qb-icon-action:hover,.qb-back-action:hover { border-color:#9eabbc; background:#f5f8fb; color:#233246; }
.qb-add-action { border-color:#df5b34; background:#df5b34; color:#fff; }
.qb-add-action:hover { border-color:#c84420; background:#c84420; }
.qb-remove-action { border-color:#edc3bb; color:#b73527; }
.qb-remove-action:hover { border-color:#c94334; background:#fff3f0; }
.qb-refresh-action { border-color:#d4a793; background:#fff8f4; color:#a74427; }
.qb-refresh-action:hover { border-color:#df5b34; background:#fff0e9; }
.qb-sim-modal__candidates { margin-top: 20px; padding-top: 17px; border-top: 1px solid #d8d0c4; }
.qb-sim-modal__candidate-head { display: flex; align-items: center; gap: 12px; }
.qb-sim-modal__candidate-head h3 { margin-right: auto; }
.qb-sim-modal__candidate-head p { margin: 0; color: var(--muted); font-size: 12px; }
.qb-sim-candidate-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 9px; }
.qb-sim-mode-tabs { display:flex; gap:6px; width:fit-content; margin-bottom:15px; padding:4px; border:1px solid #d7d0c5; border-radius:11px; background:#ebe6dd; }
.qb-sim-mode-tabs button { display:grid; grid-template-columns:auto auto; gap:3px 10px; align-items:center; min-width:158px; min-height:46px; padding:7px 13px; border:0; border-radius:8px; background:transparent; color:#6b7280; text-align:left; cursor:pointer; transition:background .16s ease,box-shadow .16s ease,color .16s ease; }
.qb-sim-mode-tabs button span { font-size:13px; font-weight:900; }
.qb-sim-mode-tabs button small { grid-column:2; color:inherit; font-size:10px; font-weight:700; }
.qb-sim-mode-tabs button.is-active { background:#fff; color:#26364a; box-shadow:0 2px 8px rgba(35,50,70,.11); }
.qb-sim-mode-tabs button.is-active::before { content:""; grid-row:1 / 3; width:4px; height:24px; border-radius:9px; background:#df5b34; }
.qb-file-picker { position:relative; display:grid; grid-template-columns:84px minmax(260px,1fr); gap:8px 12px; align-items:center; margin-bottom:14px; padding:14px; border:1px solid #d8d0c4; border-radius:12px; background:rgba(255,255,255,.64); }
.qb-file-picker > label { color:#6c7480; font-size:11px; font-weight:900; letter-spacing:.06em; }
.qb-file-picker__search { position:relative; display:flex; align-items:center; min-height:42px; border:1px solid #cfd5dd; border-radius:9px; background:#fff; box-shadow:0 2px 8px rgba(35,50,70,.04); }
.qb-file-picker__search:focus-within { border-color:#df5b34; box-shadow:0 0 0 3px rgba(223,91,52,.12); }
.qb-file-picker__search svg { flex:0 0 auto; width:17px; height:17px; margin-left:12px; fill:none; stroke:#64748b; stroke-width:1.8; stroke-linecap:round; }
.qb-file-picker__search input { min-width:0; flex:1; height:40px; padding:0 10px; border:0; outline:0; background:transparent; color:#26364a; font:inherit; font-size:13px; }
.qb-file-picker__search > span { flex:0 0 auto; margin-right:6px; padding:5px 8px; border-radius:6px; background:#f1ece5; color:#8a654f; font-size:10px; font-weight:850; }
.qb-file-picker__results { position:absolute; z-index:8; top:62px; right:14px; width:calc(100% - 110px); max-height:260px; overflow:auto; padding:6px; border:1px solid #cfd5dd; border-radius:10px; background:#fff; box-shadow:0 16px 38px rgba(31,41,55,.2); }
.qb-file-picker__results[hidden] { display:none; }
.qb-file-picker__results p { margin:0; padding:12px; color:#7b8491; font-size:12px; }
.qb-file-picker__results p.is-error { color:#b42318; }
.qb-file-picker__results button { display:grid; gap:3px; width:100%; padding:10px 11px; border:0; border-radius:7px; background:transparent; color:#26364a; text-align:left; cursor:pointer; }
.qb-file-picker__results button:hover,.qb-file-picker__results button:focus-visible { outline:0; background:#fff3ed; }
.qb-file-picker__results button b { overflow:hidden; font-size:12.5px; text-overflow:ellipsis; white-space:nowrap; }
.qb-file-picker__results button span { color:#7b8491; font-size:10.5px; }
.qb-selected-paper,.qb-file-candidate-placeholder { grid-column:1 / -1; display:flex; align-items:center; justify-content:space-between; gap:16px; min-width:0; padding:11px 13px; border:1px solid #d8e1eb; border-left:3px solid #df5b34; border-radius:9px; background:#fff; }
.qb-selected-paper > div { display:grid; gap:2px; min-width:0; }
.qb-selected-paper small { color:#a85136; font-size:9px; font-weight:900; letter-spacing:.1em; }
.qb-selected-paper b { overflow:hidden; color:#26364a; font-size:12.5px; text-overflow:ellipsis; white-space:nowrap; }
.qb-selected-paper span { color:#778291; font-size:10.5px; }
.qb-selected-paper button { flex:0 0 auto; min-height:30px; padding:0 10px; border:1px solid #d6dde5; border-radius:7px; background:#f8fafc; color:#4d6077; font-size:11px; font-weight:850; cursor:pointer; }
.qb-selected-paper button:hover { border-color:#df5b34; color:#a74427; }
.qb-file-candidate-placeholder { display:grid; justify-content:stretch; gap:3px; border-left-color:#8b9aad; }
.qb-file-candidate-placeholder b { color:#43546a; font-size:12px; }
.qb-file-candidate-placeholder span { color:#7b8491; font-size:11px; }
.qb-file-candidate-placeholder.is-complete { grid-column:1 / -1; min-height:90px; place-content:center; text-align:center; }
.qb-file-candidate-list { min-height:72px; }
.qb-sim-candidate-grid--file .qb-sim-card { position:relative; padding-top:17px; }
.qb-sim-card--file::before { content:"FILE"; position:absolute; top:0; right:14px; padding:3px 7px; border-radius:0 0 6px 6px; background:#edf1f5; color:#66778c; font-size:8px; font-weight:950; letter-spacing:.13em; }
.qb-sim-card.is-added { border-color:#a9d4bd; background:#f8fdf9; }
.qb-file-candidate__meta { display:flex; flex-wrap:wrap; gap:6px; align-items:center; }
.qb-file-candidate__meta > * { max-width:100%; padding:4px 7px; border-radius:6px; background:#f2f4f7; color:#5f6d7f; font-size:10px; font-weight:700; overflow-wrap:anywhere; }
.qb-file-candidate__meta b { background:#26364a; color:#fff; }
.qb-file-candidate__meta strong { background:#e9f7ef; color:#197044; }
.qb-sim-card--file.is-direct { border-color:#8fc8aa; box-shadow:inset 3px 0 0 #2b8a5b; }
.qb-added-state { display:inline-flex; align-items:center; gap:5px; min-height:34px; padding:0 11px; border:1px solid #9dccb2; border-radius:8px; background:#edf9f2; color:#197044; font-size:12px; font-weight:900; }
.qb-added-state svg { width:15px; height:15px; fill:none; stroke:currentColor; stroke-width:2.2; stroke-linecap:round; stroke-linejoin:round; }
.qb-file-candidate-pagination { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:12px; padding-top:12px; border-top:1px solid #d8d0c4; }
.qb-file-candidate-pagination > span { color:#6f7885; font-size:11px; font-variant-numeric:tabular-nums; }
.qb-file-candidate-pagination > div { display:flex; align-items:center; gap:7px; }
.qb-file-candidate-pagination button { min-height:32px; padding:0 12px; border:1px solid #ccd4de; border-radius:7px; background:#fff; color:#3f526a; font-size:11px; font-weight:850; cursor:pointer; }
.qb-file-candidate-pagination button:hover:not(:disabled) { border-color:#df5b34; color:#a74427; }
.qb-file-candidate-pagination button:disabled { opacity:.42; cursor:not-allowed; }
.qb-file-page-jump { display:flex; align-items:center; gap:6px; margin:0; padding:3px 3px 3px 9px; border:1px solid #d8dee6; border-radius:8px; background:#f6f8fa; }
.qb-file-page-jump label { display:flex; align-items:center; gap:5px; color:#66758a; font-size:11px; font-weight:750; white-space:nowrap; }
.qb-file-page-jump input { width:54px; height:26px; padding:0 5px; border:1px solid #c8d1dc; border-radius:5px; outline:0; background:#fff; color:#26364a; font:inherit; font-variant-numeric:tabular-nums; text-align:center; }
.qb-file-page-jump input:focus { border-color:#df5b34; box-shadow:0 0 0 2px rgba(223,91,52,.12); }
.qb-file-page-jump button { min-height:26px; padding:0 9px; border-color:#26364a; background:#26364a; color:#fff; }
.qb-file-page-jump button:hover:not(:disabled) { border-color:#df5b34; background:#df5b34; color:#fff; }
.qb-relation-detail { display:grid; gap:16px; }
.qb-back-action { width:fit-content; }
.qb-relation-detail__head { display:flex; align-items:end; justify-content:space-between; padding-bottom:12px; border-bottom:1px solid #d8d0c4; }
.qb-relation-detail__head small { color:#b65a3a; font-size:9px; font-weight:950; letter-spacing:.15em; }
.qb-relation-detail__head h3 { margin:5px 0 0; font-size:20px; }
.qb-relation-detail__head b { display:grid; place-items:center; width:42px; height:42px; border-radius:50%; background:#233246; color:#fff; font-size:17px; }
.qb-relation-detail__list { display:grid; gap:9px; }
.qb-relation-item { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:14px; align-items:center; padding:14px 16px; border:1px solid #ded7cc; border-radius:11px; background:#fff; }
.qb-relation-item small { color:#a85a3d; font-size:10px; font-weight:900; }
.qb-relation-item .qb-sim-rendered { margin-top:5px; }
.qb-sim-empty,.qb-sim-loading { color: var(--muted); font-size: 13px; }
body.is-modal-open { overflow: hidden; }
.qb-question-detail {
  display: grid;
  gap: 16px;
}
.qb-similarity__body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 18px;
}
.qb-similarity__column { min-width: 0; }
.qb-similarity__column h3 { margin: 0 0 10px; font-size: 14px; }
.qb-similarity-item {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--qb-edge);
  border-radius: 10px;
  background: #fff;
}
.qb-similarity-item + .qb-similarity-item { margin-top: 8px; }
.qb-similarity-item > a { color: var(--ink); font-weight: 750; line-height: 1.55; text-decoration: none; }
.qb-similarity-item > a:hover { color: var(--brand-dark); }
.qb-similarity-item > span { color: var(--muted); font-size: 12px; }
.qb-similarity-item form { margin: 0; }
.qb-similarity__empty { color: var(--muted); font-size: 13px; }
.qb-similarity__candidates { border-top: 1px solid var(--qb-edge); }
.qb-similarity-candidate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 18px;
}
@media (max-width: 760px) {
  .qb-sim-modal { padding: 0; }
  .qb-sim-modal__dialog { width: 100%; max-height: 100vh; height: 100%; border-radius: 0; }
  .qb-sim-modal__relations,.qb-sim-candidate-grid { grid-template-columns: 1fr; }
  .qb-sim-modal__seed.qb-has-figures { grid-template-columns:1fr; }
  .qb-sim-modal__seed.qb-has-figures > .qb-sim-figures { grid-column:1; grid-row:auto; margin-top:9px; }
  .qb-sim-modal__candidate-head { align-items: flex-start; flex-wrap: wrap; }
  .qb-sim-mode-tabs { width:100%; }
  .qb-sim-mode-tabs button { min-width:0; flex:1; }
  .qb-file-picker { grid-template-columns:1fr; }
  .qb-file-picker__results { top:108px; right:14px; width:calc(100% - 28px); }
  .qb-selected-paper,.qb-file-candidate-placeholder { grid-column:1; }
  .qb-file-candidate-pagination { align-items:flex-start; flex-direction:column; }
  .qb-file-candidate-pagination__actions { width:100%; flex-wrap:wrap; }
  .qb-similarity__body,
  .qb-similarity-candidate-grid { grid-template-columns: 1fr; }
}
.qb-question-edit {
  display: grid;
  gap: 16px;
}
.qb-question-editor { margin-top: 0; }
.qb-question-editor__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 14px;
  padding: 18px;
}
.qb-edit-field {
  display: grid;
  gap: 7px;
  min-width: 0;
}
.qb-edit-field--full { grid-column: 1 / -1; }
.qb-edit-field span {
  color: #667085;
  font-size: 11.5px;
  font-weight: 900;
}
.qb-inline-figures {
  display: grid;
  gap: 9px;
  grid-column: 1 / -1;
}
.qb-inline-figures > span {
  color: #667085;
  font-size: 11.5px;
  font-weight: 900;
}
.qb-edit-field .katex-display,
.qb-question-editor .katex-display {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}
.qb-figure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  padding: 16px 18px 18px;
}
.qb-figure-grid--inline {
  grid-template-columns: repeat(auto-fill, minmax(180px, 260px));
  padding: 0;
}
.qb-figure-tile img {
  aspect-ratio: 5 / 4;
  min-height: 180px;
}
.qb-figure-grid--editor {
  grid-column: 1 / -1;
  padding: 0;
}
.qb-empty--compact {
  min-height: 180px;
}

/* ---------- JSON editor panel ---------- */
.qb-json {
  position: sticky;
  top: 82px;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 104px);
  overflow: hidden;
  border: 1px solid var(--qb-edge);
  border-radius: var(--qb-radius-lg);
  background: var(--qb-surface);
  box-shadow: var(--qb-shadow-sm);
}
.qb-json__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex: 0 0 auto;
  padding: 14px 16px;
  border-bottom: 1px solid var(--qb-edge-soft);
}
.qb-json__head h2 { margin: 0; font-size: 15px; }
.qb-json__head > div > span { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; }
.qb-json__tools { display: flex; flex-direction: column; align-items: flex-end; gap: 7px; }
.qb-json__state {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 22px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 800;
}
.qb-json__state::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.qb-json__state.is-valid { background: #e7f6ef; color: var(--green); }
.qb-json__state.is-invalid { background: #fdece9; color: var(--red); }
.qb-json textarea {
  flex: 1 1 auto;
  width: 100%;
  height: calc(100vh - 252px);
  min-height: 460px;
  margin: 0;
  padding: 16px;
  border: 0;
  border-radius: 0;
  background: #1e293b;
  color: #e2e8f0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.65;
  resize: none;
  overflow: auto;
  tab-size: 2;
}
.qb-json__footer { flex: 0 0 auto; padding: 10px 16px; border-top: 1px solid var(--qb-edge-soft); background: var(--qb-tint); }

/* ---------- Focus + motion ---------- */
.qb-shell :focus-visible {
  outline: 2px solid color-mix(in srgb, var(--brand) 60%, var(--blue));
  outline-offset: 2px;
}
.qb-dropzone:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(212, 75, 42, 0.15);
}
@keyframes qb-pulse { 0%, 100% { opacity: 0.35; transform: scale(0.8); } 50% { opacity: 1; transform: scale(1.2); } }
@keyframes qb-spin { to { transform: rotate(360deg); } }

.practice-form__lecture{grid-column:1/-1}.practice-form__lecture select{font-weight:800}.practice-form__lecture small{min-height:18px;color:#a54a2d;font-size:12px}.practice-difficulty{grid-column:1/-1;display:grid;grid-template-columns:repeat(5,minmax(0,1fr)) auto;gap:10px;align-items:end;margin:2px 0;padding:16px;border:1px solid #dce2ea;border-radius:12px;background:#f8fafc}.practice-difficulty legend{padding:0 6px;color:#42536a;font-size:12px;font-weight:900}.practice-difficulty label{gap:7px}.practice-difficulty label>div{display:grid;grid-template-columns:32px minmax(44px,1fr) 32px;border:1px solid #d5dde8;border-radius:9px;background:#fff;overflow:hidden}.practice-difficulty input{width:100%;min-height:38px!important;padding:0!important;border:0!important;border-radius:0!important;text-align:center;font-weight:900;-moz-appearance:textfield}.practice-difficulty input::-webkit-inner-spin-button{display:none}.practice-difficulty button{border:0;background:#f0f4f8;color:#43536a;font-size:18px;cursor:pointer}.practice-difficulty button:hover{background:#e6ecf3}.practice-difficulty output{padding:0 8px 9px;color:#667085;font-size:12px;white-space:nowrap}.practice-difficulty output strong{color:#df5b34;font-size:22px}.practice-generate:disabled{opacity:.45;cursor:not-allowed}@media(max-width:900px){.practice-difficulty{grid-template-columns:repeat(3,1fr)}.practice-difficulty output{align-self:end}}@media(max-width:560px){.practice-difficulty{grid-template-columns:repeat(2,1fr)}}

.practice-form__lecture select{width:100%;min-width:0;text-overflow:ellipsis}.practice-form__lecture option{white-space:normal}.practice-shortage{display:grid;gap:4px;margin:0;padding:13px 16px;border:1px solid #f0c7a7;border-radius:10px;background:#fff8ed;color:#8a4b20;font-size:13px;font-weight:750}.practice-shortage strong{color:#713b1a}.practice-shortage span:last-child{color:#76563e;font-size:12px;font-weight:650}.practice-candidate-impact{display:inline-flex;align-items:center;min-height:22px;margin-top:8px;padding:0 8px;border-radius:999px;background:#f1f3f6;color:#667085;font-size:10px;font-style:normal;font-weight:850}.practice-candidate-impact.is-gap{background:#e9f7f0;color:#267052}

.practice-question{grid-template-columns:28px 34px minmax(0,1fr) auto;transition:opacity .15s ease,transform .15s ease,box-shadow .15s ease}.practice-question.is-dragging{opacity:.55;transform:scale(.995);box-shadow:0 10px 28px rgba(35,50,70,.14);background:#fffaf6}.practice-drag{display:grid!important;place-items:center;width:28px;min-height:40px!important;padding:0!important;border:0!important;background:transparent!important;color:#8793a3!important;cursor:grab!important}.practice-drag:active{cursor:grabbing!important}.practice-drag svg{width:18px;height:22px;fill:currentColor}.practice-paper .qb-card__head em{color:#667085;font-size:12px;font-style:normal}.practice-paper .qb-card__head em.is-saved{color:#27815d}.practice-paper .qb-card__head em.is-error{color:#b73527}@media(max-width:900px){.practice-question{grid-template-columns:26px 30px 1fr}.practice-question__actions{grid-column:3}}

.practice-nav-btn{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:0 12px;border:1px solid rgba(255,255,255,.24);border-radius:9px;background:rgba(255,255,255,.05);font-size:12px;font-weight:850;transition:.16s ease}.practice-nav-btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.practice-nav-btn:hover{border-color:rgba(255,255,255,.55);background:rgba(255,255,255,.12);transform:translateX(-2px)}.practice-detail__head>div:last-child a{display:inline-flex!important;align-items:center;justify-content:center;box-shadow:inset 0 1px 0 rgba(255,255,255,.12);transition:.16s ease}.practice-detail__head>div:last-child a:hover{border-color:#aeb9ca;background:rgba(255,255,255,.1);transform:translateY(-1px)}.practice-detail__head>div:last-child a.is-primary:hover{border-color:#f36c43;background:#ef6840}.practice-question__actions button{transition:.15s ease}.practice-question__actions button:hover{border-color:#9ba9ba;background:#f5f8fb;transform:translateY(-1px)}.practice-question__actions button.danger:hover{border-color:#d75b4c;background:#fff2ef}.practice-pool.is-replacing{border-color:#e37853;box-shadow:0 0 0 3px rgba(223,91,52,.12),var(--qb-shadow-sm)}.practice-pool.is-replacing>div{background:#fff3ec}.practice-pool.is-replacing>div p{color:#ad4829;font-weight:850}.practice-pool [data-cancel-replace]{border-color:#d7a18e;background:#fff;color:#a64227}.practice-pool [data-cancel-replace]:hover{border-color:#df5b34;background:#fff4ef}

.practice-question__actions{align-self:end!important;justify-self:end;align-items:center!important;padding-top:14px}.practice-question__actions button{min-height:34px!important;padding:0 12px!important;border-radius:9px!important;font-size:12px;box-shadow:0 1px 2px rgba(35,50,70,.05)}.practice-question__actions>button:first-child{border-color:#cfd8e5!important;background:#f7f9fc!important;color:#33475f!important}.practice-question__actions>button:first-child::before{content:'↻';margin-right:5px;font-size:15px}.practice-question__actions button.danger{border-color:#ecc9c2!important;background:#fff8f6!important;color:#ad382b!important}.practice-question__actions button.danger::before{content:'×';display:inline-grid;place-items:center;width:16px;height:16px;margin-right:5px;border:1px solid currentColor;border-radius:50%;font-size:12px;line-height:1}.practice-pool article form{display:flex;justify-content:flex-end;margin-top:10px}.practice-pool article form button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:94px;min-height:36px!important;padding:0 14px!important;border:1px solid #d9542f!important;border-radius:9px!important;background:linear-gradient(180deg,#e9633d,#d94f2b)!important;color:#fff!important;font-size:12px;font-weight:900;box-shadow:0 5px 12px rgba(217,79,43,.18);transition:.16s ease}.practice-pool article form button::before{content:'＋';font-size:16px;font-weight:500}.practice-pool article form button:hover{transform:translateY(-1px);box-shadow:0 7px 16px rgba(217,79,43,.25);filter:saturate(1.08)}.practice-pool.is-replacing article form button{background:linear-gradient(180deg,#2f425a,#233246)!important;border-color:#233246!important;box-shadow:0 5px 12px rgba(35,50,70,.18)}.practice-pool.is-replacing article form button::before{content:'↻'}@media(max-width:900px){.practice-question__actions{grid-column:3!important}}@media(max-width:560px){.practice-question__actions{grid-column:2/4!important;width:100%;justify-content:flex-end}}

.practice-source{display:inline-flex;align-items:center;min-height:22px;padding:0 8px;border:1px solid transparent;border-radius:999px;font-size:11px;font-weight:900;line-height:1}.practice-source--direct_similarity,.practice-source--source_direct_similarity{border-color:#efb4a2;background:#fff0ea;color:#a63e22}.practice-source--cluster_similarity,.practice-source--source_cluster_similarity{border-color:#b8cce8;background:#eef5ff;color:#315b91}.practice-source--knowledge{border-color:#b8d9c9;background:#edf8f2;color:#2b7252}

.qb-sim-risk{display:grid;gap:3px;padding:9px 10px;border:1px solid #efcf9a;border-radius:9px;background:#fff8e8;color:#7c4b12;font-size:11px;line-height:1.5}.qb-sim-risk b{font-size:10px;letter-spacing:.08em}.qb-shortest-path{margin-top:9px;padding:9px 10px;border:1px solid #d9e2ef;border-radius:9px;background:#f6f9fd}.qb-shortest-path b{display:block;margin-bottom:7px;color:#49647f;font-size:10px;letter-spacing:.04em}.qb-shortest-path ol{display:flex;align-items:center;gap:6px;margin:0;padding:0;list-style:none;overflow-x:auto}.qb-shortest-path li{display:inline-flex;align-items:center;min-height:24px;padding:0 8px;border-radius:999px;background:#e6edf6;color:#354c65;font-size:10px;white-space:nowrap}.qb-shortest-path li+li::before{content:'→';margin-left:-13px;margin-right:7px;color:#8496aa}
@media (prefers-reduced-motion: reduce) {
  .qb-status--running::before,
  .qb-spinner { animation: none; }
  .qb-btn,
  .qb-q,
  .qb-image-tile,
  .qb-progress span { transition: none; }
}

/* ---------- 专项加练 ---------- */
.practice-lab,.practice-detail{display:grid;gap:18px}.practice-hero{display:flex;align-items:end;justify-content:space-between;padding:30px 34px;border-radius:18px;background:#223249;color:#fff;box-shadow:0 18px 50px rgba(30,45,65,.18)}.practice-hero span{color:#f1a27d;font-size:10px;font-weight:950;letter-spacing:.18em}.practice-hero h1{margin:8px 0 5px;font-size:34px}.practice-hero p{margin:0;color:#cdd6e1}.practice-hero>b{text-align:right;color:#cdd6e1;font-size:13px}.practice-hero strong{color:#fff;font-size:24px}.practice-form{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;padding:20px}.practice-form label{display:grid;gap:6px}.practice-form label>span{color:#667085;font-size:11px;font-weight:900}.practice-form select,.practice-form input{min-height:42px;padding:0 11px;border:1px solid #d9e0e9;border-radius:9px;background:#fff}.practice-form__name{grid-column:1/4}.practice-generate{display:flex;align-items:center;justify-content:center;gap:8px;align-self:end;min-height:42px;border:0;border-radius:9px;background:#df5b34;color:#fff;font-weight:900;cursor:pointer}.practice-generate svg{width:16px;fill:none;stroke:currentColor;stroke-width:2}.practice-history>a{display:flex;justify-content:space-between;padding:14px 18px;border-top:1px solid var(--qb-edge-soft);color:#26364a}.practice-history>a span{color:var(--muted)}.practice-detail__head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:22px;align-items:center;padding:20px 24px;border-radius:15px;background:#223249;color:#fff}.practice-detail__head>a{color:#dce4ee}.practice-detail__head form{display:flex;gap:8px}.practice-detail__head input{width:min(520px,100%);padding:8px 10px;border:1px solid #506078;border-radius:8px;background:#fff;color:#233246;font-size:18px;font-weight:850}.practice-detail__head button{border:1px solid #708097;border-radius:8px;background:transparent;color:#fff}.practice-detail__head p{margin:6px 0 0;color:#bfcbd9;font-size:12px}.practice-detail__head>div:last-child{display:flex;gap:8px}.practice-detail__head>div:last-child a{padding:10px 13px;border:1px solid #738198;border-radius:8px;color:#fff;font-size:12px;font-weight:850}.practice-detail__head>div:last-child a.is-primary{border-color:#df5b34;background:#df5b34}.practice-workspace{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(320px,.8fr);gap:16px;align-items:start}.practice-paper,.practice-pool{border:1px solid var(--qb-edge);border-radius:14px;background:#fff;box-shadow:var(--qb-shadow-sm)}.practice-question{display:grid;grid-template-columns:38px minmax(0,1fr) auto;gap:12px;padding:18px;border-top:1px solid var(--qb-edge-soft)}.practice-question>b{color:#df5b34;font-size:17px}.practice-question p,.practice-pool article p{margin:0;color:#273449;font-weight:750;line-height:1.7}.practice-question small,.practice-pool small{display:block;margin-top:8px;color:var(--muted)}.practice-question__actions{display:flex;align-items:start;gap:5px}.practice-question__actions form{margin:0}.practice-question__actions button,.practice-pool button{min-height:31px;padding:0 9px;border:1px solid #d6dde7;border-radius:7px;background:#fff;color:#46566c;font-weight:800;cursor:pointer}.practice-question__actions button.danger{color:#b73527}.practice-pool{position:sticky;top:82px;max-height:calc(100vh - 104px);overflow:auto}.practice-pool>div{position:sticky;top:0;z-index:2;padding:17px;background:#f7f4ee;border-bottom:1px solid #ded7cc}.practice-pool h2{margin:0}.practice-pool>div p{margin:5px 0;color:var(--muted);font-size:12px}.practice-pool article{padding:15px;border-bottom:1px solid var(--qb-edge-soft)}.practice-pool article form{text-align:right}.practice-pool article button{border-color:#df5b34;background:#df5b34;color:#fff}@media(max-width:900px){.practice-form{grid-template-columns:repeat(2,1fr)}.practice-form__name{grid-column:1/-1}.practice-workspace{grid-template-columns:1fr}.practice-pool{position:static;max-height:none}.practice-detail__head{grid-template-columns:1fr}.practice-question{grid-template-columns:30px 1fr}.practice-question__actions{grid-column:2;flex-wrap:wrap}}@media(max-width:560px){.practice-form{grid-template-columns:1fr}.practice-hero{align-items:start;gap:20px}.practice-hero>b{display:none}}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .qb-workspace,
  .qb-review-workspace { grid-template-columns: 1fr; }
  .qb-question-filter-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qb-question-filter-form__wide { grid-column: 1 / -1; }
  .qb-question-editor__body { grid-template-columns: 1fr; }
  .qb-source-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qb-upload { position: static; }
  .qb-json { position: static; max-height: none; }
  .qb-json textarea { height: 480px; min-height: 480px; max-height: 640px; resize: vertical; }
  .qb-hero { align-items: flex-start; }
}
@media (max-width: 640px) {
  .qb-shell { padding: 16px 14px 44px; }
  .qb-hero,
  .qb-review-head { padding: 18px; }
  .qb-source-editor__head { display: grid; }
  .qb-source-grid { grid-template-columns: 1fr; }
  .qb-question-filter-form { grid-template-columns: 1fr; padding-left: 14px; padding-right: 14px; }
  .qb-question-row {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    padding: 14px;
  }
  .qb-question-row__meta {
    grid-column: 2;
    justify-content: flex-start;
    min-width: 0;
  }
  .qb-question-row__main strong,
  .qb-question-row__main small { white-space: normal; }
  .qb-question-editor__body { padding: 14px; }
  .qb-figure-grid { grid-template-columns: 1fr; padding-left: 14px; padding-right: 14px; }
  .qb-figure-grid--editor { padding-left: 0; padding-right: 0; }
  .qb-hero__stats,
  .qb-review-head__actions { width: 100%; }
  .qb-review-head__actions .qb-btn { flex: 1 1 auto; }
  .qb-card__head,
  .qb-upload__form,
  .qb-pipeline { padding-left: 14px; padding-right: 14px; }
  .qb-status-filter { padding-left: 14px; padding-right: 14px; }
  /* table → stacked cards */
  .qb-jobs__scroll { overflow: visible; }
  .qb-table { min-width: 0; }
  .qb-table thead { display: none; }
  .qb-table,
  .qb-table tbody,
  .qb-table tr,
  .qb-table td { display: block; width: 100%; }
  .qb-table tr {
    padding: 14px;
    margin-bottom: 10px;
    border: 1px solid var(--qb-edge);
    border-radius: var(--qb-radius);
    background: #fff;
    box-shadow: var(--qb-shadow-sm);
  }
  .qb-table tbody td { padding: 6px 0; border: 0; background: transparent; }
  .qb-table tbody td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 3px;
    color: #97a1b3;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-transform: uppercase;
  }
  .qb-table__row:hover td { background: transparent; }
  .qb-file-item { max-width: none; }
  .qb-table__file strong { white-space: normal; }
  .qb-progress { width: 100%; }
}

.narrow { max-width: 440px; margin: 70px auto; }
.stack { display: grid; gap: 14px; }
.muted { color: var(--muted); font-size: 14px; }
.error { color: var(--red); }
.success { color: var(--green); }

.auth-shell {
  min-height: calc(100vh - 170px);
  display: grid;
  place-items: center;
}

.auth-card {
  width: min(100%, 560px);
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.auth-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.auth-card__head > div {
  min-width: 0;
}

.auth-logo {
  display: block;
  flex: 0 0 auto;
  width: 118px;
  height: 118px;
  object-fit: contain;
  margin: -14px -4px -2px 0;
  filter: drop-shadow(0 12px 22px rgba(212, 75, 42, 0.2));
}

.auth-card h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.12;
}

.auth-card .muted { margin: 10px 0 0; }

.profile-shell {
  min-height: calc(100vh - 150px);
  display: grid;
  align-items: start;
  justify-items: center;
  padding: 54px 18px;
}

.profile-card {
  width: min(100%, 620px);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.profile-card__head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin-bottom: 20px;
}

.profile-card__head h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.12;
}

.profile-card__head .muted { margin: 8px 0 0; }

.profile-avatar {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  border: 1px solid rgba(18, 128, 92, 0.22);
  border-radius: 50%;
  background: #ecfdf5;
  color: var(--green);
  font-size: 24px;
  font-weight: 900;
}

.profile-message {
  margin: 0 0 16px;
  padding: 11px 12px;
  border-radius: 8px;
  background: #f8fafc;
  font-weight: 800;
}

.profile-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.profile-form label {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.profile-form input {
  width: 100%;
  min-width: 0;
}

.profile-actions {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.password-field {
  position: relative;
  display: block;
}

.password-field input { padding-right: 46px; }

.password-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #667085;
  cursor: pointer;
  transform: translateY(-50%);
}

.password-toggle:hover {
  background: #f2f5f9;
  color: var(--ink);
}

.password-toggle:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--brand) 45%, white);
  outline-offset: 1px;
}

.password-toggle__eye-off,
.password-toggle.is-visible .password-toggle__eye { display: none; }
.password-toggle.is-visible .password-toggle__eye-off { display: block; }

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 11px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 112px;
  resize: vertical;
  line-height: 1.65;
}

select {
  appearance: none;
  background:
    linear-gradient(45deg, transparent 50%, #657084 50%) calc(100% - 17px) 50% / 7px 7px no-repeat,
    linear-gradient(135deg, #657084 50%, transparent 50%) calc(100% - 12px) 50% / 7px 7px no-repeat,
    #fff;
  padding-right: 32px;
}

input:disabled {
  background: #f5f7fb;
  color: var(--muted);
}

.lesson-layout {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 0;
}

.lesson-sidebar {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 18px 14px;
  border-right: 1px solid var(--line);
  background: #eef3f8;
}

.sidebar-title {
  padding: 10px 10px 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 10px;
}

.sidebar-title span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.sidebar-title strong {
  display: block;
  margin-top: 4px;
  line-height: 1.35;
}

.lesson-sidebar a {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  color: #2f3a4f;
  font-size: 13px;
}

.lesson-sidebar a:hover { background: #dfe7f1; color: var(--ink); }

.sidebar-index {
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: #cbd8e6;
  font-size: 11px;
  font-weight: 800;
}

.sidebar-section {
  margin: 16px 10px 6px;
  color: #738093;
  font-size: 11px;
  font-weight: 800;
}

.lesson-main {
  min-width: 0;
  max-width: 1040px;
  width: 100%;
  margin: 0 auto;
  padding: 34px 32px 72px;
}

.lesson-hero,
.content-section,
.segment-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.04);
}

.lesson-hero { overflow: hidden; margin-bottom: 24px; }

.lesson-hero__bar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 22px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.lesson-hero__content {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 22px 16px;
}

.lesson-hero h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
}

.hero-subtitle {
  max-width: 720px;
  margin: 12px 0 0;
  color: var(--muted);
}

.hero-actions { display: flex; align-items: start; gap: 8px; }

.meta-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  padding: 0 22px 16px;
}

.meta-grid span {
  display: grid;
  gap: 3px;
  margin: 0;
}

.meta-grid strong {
  color: #8a95a6;
  font-size: 11px;
}

.tag-row { padding: 0 22px 22px; margin-top: 0; }

.model-compare {
  margin-bottom: 24px;
  padding: 22px;
  border: 1px solid #cbd8e6;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08), transparent 36%),
    linear-gradient(315deg, rgba(212, 75, 42, 0.08), transparent 40%),
    #fff;
  box-shadow: 0 14px 38px rgba(23, 32, 51, 0.06);
  scroll-margin-top: 82px;
}

.model-compare__head {
  margin-bottom: 16px;
}

.model-compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: start;
}

.model-compare-card {
  --model-accent: #2563eb;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--model-accent) 24%, var(--line));
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 30px rgba(23, 32, 51, 0.06);
}

.model-compare-card--openai {
  --model-accent: #d44b2a;
}

.model-compare-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--model-accent) 18%, var(--line-soft));
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--model-accent) 13%, transparent), transparent 52%),
    #fff;
}

.model-compare-card__head span,
.model-compare-card__head strong {
  display: block;
}

.model-compare-card__head span {
  color: color-mix(in srgb, var(--model-accent) 82%, #182230);
  font-size: 12px;
  font-weight: 900;
}

.model-compare-card__head strong {
  margin-top: 2px;
  color: #172033;
  font-size: 22px;
  line-height: 1;
}

.model-compare-card__head em {
  flex: 0 0 auto;
  padding: 4px 8px;
  border-radius: 999px;
  background: #e9f7ef;
  color: var(--green);
  font-size: 12px;
  font-style: normal;
  font-weight: 900;
}

.model-compare-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 12px 14px 0;
}

.model-compare-card__meta span,
.model-compare-card__meta time {
  padding: 3px 8px;
  border-radius: 999px;
  background: #f2f5f9;
  color: #596579;
  font-size: 12px;
  font-weight: 800;
}

.model-compare-card__note {
  margin: 10px 14px 0;
  padding: 9px 10px;
  border-left: 3px solid var(--model-accent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--model-accent) 7%, #fff);
  color: #405066;
  font-size: 12.5px;
  line-height: 1.55;
}

.model-compare-section,
.model-example-mini {
  margin: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
}

.model-compare-section summary,
.model-example-mini summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 11px;
  cursor: pointer;
  list-style: none;
  color: #223047;
  font-size: 13px;
  font-weight: 900;
}

.model-compare-section summary::-webkit-details-marker,
.model-example-mini summary::-webkit-details-marker {
  display: none;
}

.model-compare-section summary span {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: color-mix(in srgb, var(--model-accent) 14%, #fff);
  color: color-mix(in srgb, var(--model-accent) 82%, #182230);
  font-size: 11px;
}

.model-compare-section__body,
.model-example-mini__body {
  display: grid;
  gap: 10px;
  padding: 10px;
  border-top: 1px solid var(--line-soft);
}

.model-overview-mini,
.model-mini-block {
  display: grid;
  gap: 9px;
}

.model-overview-mini h4,
.model-mini-block h4 {
  margin: 2px 0 0;
  color: #3f4a5e;
  font-size: 13px;
}

.model-compare-card .content-card,
.model-compare-card .compound-card {
  box-shadow: none;
}

.model-compare-card .content-card {
  grid-template-columns: minmax(70px, 98px) minmax(0, 1fr);
  padding: 11px 12px;
}

.model-compare-card .content-card__body,
.model-compare-card .compound-card__text {
  font-size: 13.5px;
  line-height: 1.7;
}

.model-compare-card .compound-card__head {
  padding: 10px 11px;
}

.model-compare-card .compound-card__body {
  padding-inline: 11px;
}

.model-compare-card .body-image-tile img,
.model-compare-card .ref-tile img {
  max-height: 220px;
}

.edit-banner {
  margin: 0;
  padding: 12px 22px;
  border-top: 1px solid #f1d6cb;
  background: #fff4ee;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 700;
}

.metadata-form {
  margin: 0;
  padding: 18px 22px 22px;
  border-top: 1px solid var(--line-soft);
  background: #fbfcfe;
}

.metadata-form__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.metadata-form__head strong,
.metadata-form__head span {
  display: block;
}

.metadata-form__head strong {
  font-size: 15px;
}

.metadata-form__head span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.metadata-form__head button {
  background: var(--brand);
  white-space: nowrap;
}

.metadata-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metadata-grid label {
  display: grid;
  gap: 6px;
}

.metadata-grid label span {
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.metadata-grid input,
.metadata-grid textarea {
  margin: 0;
  background: #fff;
}

.metadata-grid textarea {
  min-height: 82px;
}

.metadata-grid__wide { grid-column: span 2; }
.metadata-grid__full { grid-column: 1 / -1; }

.content-section,
.segment-panel {
  padding: 22px;
  margin-bottom: 22px;
  scroll-margin-top: 82px;
}

.section-head,
.segment-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.section-number,
.segment-head > span {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-weight: 900;
}

.section-head h2,
.segment-head h2 {
  margin: 0;
  font-size: 21px;
  line-height: 1.25;
}

.section-head p,
.segment-head p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.overview-grid { display: grid; gap: 14px; }

.overview-panel,
.materials-panel,
.feedback-panel,
.group-card,
.lesson-details {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
}

.overview-panel {
  padding: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 251, 255, 0.86)),
    #fff;
  box-shadow: 0 10px 28px rgba(23, 32, 51, 0.04);
}
.overview-panel h3,
.materials-panel h3 {
  margin: 0 0 12px;
  color: #30394b;
  font-size: 15px;
}

.overview-panel__items,
.group-card__body,
.segment-intro,
.details-body,
.feedback-panel,
.materials-panel {
  display: grid;
  gap: 10px;
}

.content-card {
  --card-accent: #98a2b3;
  --card-bg: #fff;
  --card-ink: #273247;
  --label-bg: #f1f4f8;
  --label-ink: #48556a;
  position: relative;
  display: grid;
  grid-template-columns: minmax(76px, 118px) minmax(0, 1fr);
  gap: 10px;
  padding: 13px 14px;
  border: 1px solid color-mix(in srgb, var(--card-accent) 20%, var(--line-soft));
  border-left: 4px solid var(--card-accent);
  border-radius: 8px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--card-accent) 8%, transparent), transparent 42%),
    var(--card-bg);
  box-shadow: 0 8px 22px rgba(23, 32, 51, 0.045);
}

.content-card::after {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 26px;
  height: 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--card-accent) 55%, transparent);
}

.content-card__label {
  align-self: start;
  width: fit-content;
  max-width: 100%;
  padding: 4px 8px;
  border: 1px solid color-mix(in srgb, var(--card-accent) 20%, transparent);
  border-radius: 999px;
  background: var(--label-bg);
  color: var(--label-ink);
  font-size: 12px;
  font-weight: 900;
  line-height: 1.35;
}

.content-card__body {
  min-width: 0;
  color: var(--card-ink);
  font-size: 14.5px;
  line-height: 1.78;
}

.download-link {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  color: var(--brand);
  font-weight: 900;
  text-decoration: none;
}

.download-link:hover {
  text-decoration: underline;
}

.content-card__body img {
  display: inline-block;
  max-width: 100%;
  height: auto;
  margin: 8px auto;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fff;
}

.content-card--overview,
.content-card--knowledge,
.content-card--role-knowledge {
  --card-accent: #2563eb;
  --card-bg: #f8fbff;
  --label-bg: #eaf2ff;
  --label-ink: #174ea6;
}

.content-card--method,
.content-card--role-method {
  --card-accent: #b86510;
  --card-bg: #fffaf4;
  --label-bg: #fff0db;
  --label-ink: #7a3f00;
}

.content-card--highlight,
.content-card--role-highlight {
  --card-accent: #d39b0f;
  --card-bg: #fffdf3;
  --label-bg: #fff3bf;
  --label-ink: #765100;
}

.content-card--role-highlight .content-card__body {
  font-weight: 650;
  color: #3f3320;
}

.content-card--board,
.content-card--role-board {
  --card-accent: #7357c4;
  --card-bg: #fbf8ff;
  --label-bg: #f0e9ff;
  --label-ink: #563d98;
}

.content-card--stem,
.content-card--role-stem {
  --card-accent: #12805c;
  --card-bg: #f5fbf8;
  --label-bg: #def7ea;
  --label-ink: #0d684a;
}

.content-card--guide,
.content-card--role-transition {
  --card-accent: #0f8a7a;
  --card-bg: #f3fbf8;
  --label-bg: #dff7ef;
  --label-ink: #0b695d;
}

.content-card--role-transition .content-card__body,
.content-card--role-script .content-card__body {
  color: #273247;
}

.content-card--error,
.content-card--role-error {
  --card-accent: #b42318;
  --card-bg: #fff8f7;
  --label-bg: #ffe5e0;
  --label-ink: #9f1d13;
}

.content-card--role-error .content-card__body {
  color: #4b2b27;
}

.content-card--role-question-chain {
  --card-accent: #0891b2;
  --card-bg: #f5fcff;
  --label-bg: #dff5fb;
  --label-ink: #056174;
}

.content-card--role-question-chain .content-card__body {
  padding-left: 12px;
  border-left: 1px solid color-mix(in srgb, var(--card-accent) 35%, transparent);
  color: #23384a;
}

.content-card--role-script {
  --card-accent: #475467;
  --card-bg: #fbfcfe;
  --label-bg: #eef2f6;
  --label-ink: #3f4a5e;
}

.content-card--feedback {
  --card-accent: #0891b2;
  --card-bg: #f5fcff;
  --label-bg: #dff5fb;
  --label-ink: #056174;
}

.compound-card {
  --compound-accent: #64748b;
  --compound-bg: #fff;
  --compound-label-bg: #eef2f6;
  --compound-label-ink: #3f4a5e;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--compound-accent) 18%, var(--line-soft));
  border-radius: 8px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--compound-accent) 6%, transparent), transparent 46%),
    var(--compound-bg);
  box-shadow: 0 10px 28px rgba(23, 32, 51, 0.05);
}

.compound-card__head {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 13px 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--compound-accent) 15%, var(--line-soft));
  background: color-mix(in srgb, var(--compound-accent) 7%, #fff);
}

.compound-card__icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: color-mix(in srgb, var(--compound-accent) 14%, #fff);
  color: var(--compound-accent);
  font-size: 15px;
  font-weight: 900;
}

.compound-card__head strong,
.compound-card__head small {
  display: block;
}

.compound-card__head strong {
  color: #1f2a3d;
  font-size: 15px;
  line-height: 1.25;
}

.compound-card__head small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.compound-card__body {
  display: grid;
  gap: 0;
  padding: 2px 14px 12px;
}

.compound-card__item {
  display: grid;
  grid-template-columns: minmax(76px, 112px) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed color-mix(in srgb, var(--compound-accent) 18%, var(--line-soft));
}

.compound-card__item:last-child {
  border-bottom: 0;
}

.compound-card__tag {
  align-self: start;
  width: fit-content;
  max-width: 100%;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--compound-label-bg);
  color: var(--compound-label-ink);
  font-size: 12px;
  font-weight: 900;
  line-height: 1.35;
}

.compound-card__text {
  min-width: 0;
  color: #273247;
  font-size: 14.5px;
  line-height: 1.78;
}

.compound-card__item--highlight .compound-card__text,
.compound-card__item--method .compound-card__text {
  font-weight: 650;
}

.compound-card__item--question-chain .compound-card__text {
  padding-left: 12px;
  border-left: 1px solid color-mix(in srgb, var(--compound-accent) 35%, transparent);
}

.compound-card__item .body-images {
  grid-column: 2;
  margin-top: 0;
}

.compound-card--knowledge {
  --compound-accent: #2563eb;
  --compound-bg: #f8fbff;
  --compound-label-bg: #eaf2ff;
  --compound-label-ink: #174ea6;
}

.compound-card--method {
  --compound-accent: #b86510;
  --compound-bg: #fffaf4;
  --compound-label-bg: #fff0db;
  --compound-label-ink: #7a3f00;
}

.compound-card--highlight {
  --compound-accent: #d39b0f;
  --compound-bg: #fffdf3;
  --compound-label-bg: #fff3bf;
  --compound-label-ink: #765100;
}

.compound-card--board {
  --compound-accent: #7357c4;
  --compound-bg: #fbf8ff;
  --compound-label-bg: #f0e9ff;
  --compound-label-ink: #563d98;
}

.compound-card--guide {
  --compound-accent: #0f8a7a;
  --compound-bg: #f3fbf8;
  --compound-label-bg: #dff7ef;
  --compound-label-ink: #0b695d;
}

.compound-card--error {
  --compound-accent: #b42318;
  --compound-bg: #fff8f7;
  --compound-label-bg: #ffe5e0;
  --compound-label-ink: #9f1d13;
}

.group-card {
  overflow: hidden;
  background: #fff;
  box-shadow: 0 8px 24px rgba(23, 32, 51, 0.04);
}

.group-card__head {
  position: relative;
  padding: 9px 12px 9px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: #f4f7fb;
  color: #3f4a5e;
  font-size: 13px;
  font-weight: 900;
}

.group-card__head::before {
  content: "";
  position: absolute;
  top: 9px;
  bottom: 9px;
  left: 8px;
  width: 3px;
  border-radius: 999px;
  background: #98a2b3;
}

.group-card__body { padding: 10px; }

.group-card--highlight .group-card__head { background: #fff7d6; color: #7a5300; }
.group-card--highlight .group-card__head::before { background: #d39b0f; }
.group-card--board .group-card__head { background: #f3edff; color: #5c45a0; }
.group-card--board .group-card__head::before { background: #7357c4; }
.group-card--method .group-card__head { background: #fff1df; color: #8a4b05; }
.group-card--method .group-card__head::before { background: #b86510; }
.group-card--knowledge .group-card__head { background: #eaf2ff; color: #174ea6; }
.group-card--knowledge .group-card__head::before { background: #2563eb; }

.lesson-details {
  margin-top: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 12px 32px rgba(23, 32, 51, 0.045);
}

.lesson-details summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line-soft);
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.06), transparent 44%),
    #fff;
  cursor: pointer;
  list-style: none;
}

.lesson-details summary::-webkit-details-marker { display: none; }

.lesson-details summary span {
  padding: 3px 8px;
  border-radius: 999px;
  background: #eaf2ff;
  color: #174ea6;
  font-size: 12px;
  font-weight: 900;
}

.lesson-details summary strong {
  min-width: 0;
  color: #1f2a3d;
  font-size: 15.5px;
}

.details-body {
  padding: 14px;
  background: #fbfcfe;
}

.example-details summary {
  background:
    linear-gradient(90deg, rgba(18, 128, 92, 0.07), transparent 44%),
    #fff;
}

.example-details summary span {
  background: #def7ea;
  color: #0d684a;
}

.segment-transcript {
  margin-top: 16px;
  overflow: hidden;
  border: 1px solid #d9d3c5;
  border-radius: 10px;
  background: #fffdf8;
  box-shadow: 0 10px 26px rgba(65, 52, 28, 0.055);
}

.segment-transcript summary {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 14px 16px;
  background:
    linear-gradient(90deg, rgba(187, 137, 38, 0.1), transparent 56%),
    #fffdf8;
  cursor: pointer;
  list-style: none;
  transition: background-color 160ms ease;
}

.segment-transcript summary:hover {
  background-color: #fff9eb;
}

.segment-transcript summary:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.28);
  outline-offset: -3px;
}

.segment-transcript summary::-webkit-details-marker { display: none; }

.segment-transcript__mark {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid #d6b566;
  border-radius: 8px;
  background: #fff8df;
  color: #805d12;
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 17px;
  font-weight: 900;
}

.segment-transcript__title {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.segment-transcript__title strong {
  color: #40351f;
  font-size: 15px;
}

.segment-transcript__title small {
  color: #81755f;
  font-size: 12px;
}

.segment-transcript__chevron {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 2px solid #8c7547;
  border-bottom: 2px solid #8c7547;
  transform: rotate(45deg) translate(-2px, 2px);
  transition: transform 180ms ease;
}

.segment-transcript[open] .segment-transcript__chevron {
  transform: rotate(225deg) translate(-2px, 2px);
}

.segment-transcript__body {
  padding: 18px 20px 20px;
  border-top: 1px solid #e9e2d4;
  background:
    repeating-linear-gradient(180deg, transparent 0, transparent 31px, rgba(145, 119, 67, 0.07) 32px),
    #fffefb;
}

.segment-transcript__text {
  max-width: 78ch;
  color: #3f3a30;
  font-size: 15px;
  line-height: 2.08;
  letter-spacing: 0.012em;
}

.segment-transcript .content-card--transcript {
  --card-accent: #b88b2f;
  --card-bg: rgba(255, 255, 255, 0.82);
}

.chapter-divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 24px 0;
  color: #7a8597;
  font-size: 13px;
  font-weight: 900;
}

.chapter-divider::before,
.chapter-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

.refs-grid,
.materials-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.source-materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.source-material-card {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(185, 28, 28, 0.055), transparent 46%),
    #fff;
  color: var(--ink);
  font: inherit;
  text-align: left;
  box-shadow: 0 8px 22px rgba(23, 32, 51, 0.045);
  cursor: pointer;
  transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}

.source-material-card:hover,
.source-material-card:focus-visible {
  border-color: #b9c5d8;
  box-shadow: 0 12px 28px rgba(23, 32, 51, 0.08);
  transform: translateY(-1px);
  outline: none;
}

.source-material-card .sm-icon {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #fee2e2;
  color: #b91c1c;
  font-size: 13px;
  font-weight: 900;
}

.source-material-card .sm-meta {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.source-material-card .sm-meta strong {
  display: block;
  overflow: hidden;
  color: #263047;
  font-size: 14px;
  font-weight: 900;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-material-card .sm-meta span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

body.material-preview-lock { overflow: hidden; }

.material-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.material-preview-modal[hidden] { display: none; }

.material-preview-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.58);
  opacity: 0;
  transition: opacity .18s ease;
}

.material-preview-modal__dialog {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: min(1040px, 100%);
  height: min(760px, calc(100vh - 48px));
  overflow: hidden;
  border: 1px solid rgba(221, 228, 238, 0.9);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.28);
  opacity: 0;
  transform: translateY(10px) scale(.985);
  transition: opacity .18s ease, transform .18s ease;
}

.material-preview-modal.is-open .material-preview-modal__backdrop { opacity: 1; }
.material-preview-modal.is-open .material-preview-modal__dialog {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.material-preview-modal__head,
.material-preview-modal__foot {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: #fff;
}

.material-preview-modal__head {
  justify-content: space-between;
  border-bottom: 1px solid var(--line-soft);
}

.material-preview-modal__head h2 {
  max-width: min(680px, 70vw);
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.28;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.material-preview-modal__head span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.material-preview-modal__close {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #f8fafc;
  color: #475569;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.material-preview-modal__close:hover,
.material-preview-modal__close:focus-visible {
  border-color: #b9c5d8;
  background: #fff;
  color: var(--ink);
  outline: none;
}

.material-preview-modal__body {
  flex: 1;
  min-height: 0;
  background: #eef2f7;
}

.material-preview-modal__body iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.material-preview-modal__foot {
  justify-content: flex-end;
  border-top: 1px solid var(--line-soft);
}

.ref-tile {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px dashed #c7d1df;
  border-radius: 8px;
  background: #fbfdff;
}

.ref-tile strong,
.ref-tile span { display: block; }
.ref-tile span { color: var(--muted); font-size: 12px; }
.ref-tile img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  width: auto;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
  object-fit: contain;
}

.ref-empty {
  display: grid;
  min-height: 88px;
  place-items: center;
  border: 1px dashed #d5dde8;
  border-radius: 8px;
  background: #f5f8fc;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.ref-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 8px;
  align-items: center;
}

.ref-actions input {
  min-width: 0;
  padding: 8px;
  font-size: 13px;
}

.ref-actions button {
  white-space: nowrap;
}

.body-images {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.content-card > .body-images {
  grid-column: 2;
}

.body-image-tile {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px dashed #c7d1df;
  border-radius: 8px;
  background: #fbfdff;
}

.body-image-tile img {
  display: block;
  max-width: 100%;
  max-height: 340px;
  width: auto;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
  object-fit: contain;
}

.body-image-uploader {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  padding: 10px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  background: #fff;
}

.body-image-uploader input {
  min-width: 0;
  padding: 8px;
  font-size: 13px;
}

.content-note {
  --note-accent: #64748b;
  --note-bg: #f3f6fa;
  --note-ink: #405066;
  grid-column: 2;
  position: relative;
  padding: 10px 12px 10px 14px;
  border: 1px solid color-mix(in srgb, var(--note-accent) 18%, transparent);
  border-left: 3px solid var(--note-accent);
  border-radius: 8px;
  background: var(--note-bg);
  color: var(--note-ink);
  font-size: 13px;
  line-height: 1.7;
}

.content-note strong {
  display: inline-flex;
  align-items: center;
  margin-right: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--note-accent) 14%, #fff);
  color: color-mix(in srgb, var(--note-accent) 82%, #182230);
  font-size: 12px;
  line-height: 1.4;
}

.content-note--example {
  --note-accent: #b86510;
  --note-bg: #fffaf4;
  --note-ink: #593b1e;
}

.content-note--transition {
  --note-accent: #0f8a7a;
  --note-bg: #f2fbf8;
  --note-ink: #244f49;
}

.content-note--transition::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 7px;
  width: 1px;
  background: color-mix(in srgb, var(--note-accent) 28%, transparent);
}

.quote-block {
  --quote-accent: #d39b0f;
  grid-column: 2;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--quote-accent) 24%, transparent);
  border-left: 3px solid var(--quote-accent);
  border-radius: 8px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--quote-accent) 9%, transparent), transparent 58%),
    #fffaf0;
  color: #3f4a5e;
  font-size: 13px;
  line-height: 1.75;
}

.quote-block span {
  display: block;
  width: fit-content;
  margin-bottom: 7px;
  padding: 2px 7px;
  border-radius: 999px;
  background: #fff1c7;
  color: #8a5b00;
  font-size: 12px;
  font-weight: 900;
}

.inline-edit {
  display: grid;
  gap: 8px;
}

.inline-edit textarea {
  min-height: 120px;
  border-color: #cbd5e1;
  background: #fff;
}

.inline-edit__extra {
  display: grid;
  gap: 5px;
}

.inline-edit__extra span {
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.inline-edit__extra textarea {
  min-height: 72px;
  background: #fbfdff;
}

.inline-edit__footer {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
}

.inline-edit__footer span {
  min-width: 0;
  overflow: hidden;
  color: #8a95a6;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.version-list {
  display: grid;
  gap: 8px;
}

.version-row {
  display: grid;
  grid-template-columns: 60px 130px 190px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}

.version-row strong { color: var(--ink); }
.version-actions {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}
.version-actions input {
  width: 96px;
  min-width: 0;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}
.version-note {
  color: #2f3a4f;
}
.version-row em {
  padding: 3px 8px;
  border-radius: 999px;
  background: #e9f7ef;
  color: var(--green);
  font-style: normal;
  font-weight: 900;
}
.version-row--source { grid-template-columns: 1fr; }

.save-dock {
  position: sticky;
  bottom: 14px;
  z-index: 12;
  display: grid;
  grid-template-columns: minmax(130px, 180px) minmax(0, 1fr) auto;
  gap: 14px;
  align-items: end;
  margin-top: 22px;
  padding: 14px;
  border: 1px solid rgba(212, 75, 42, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 46px rgba(23, 32, 51, 0.14);
  backdrop-filter: blur(12px);
}

.save-dock label {
  display: grid;
  gap: 6px;
}

.save-dock label span {
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.save-dock textarea {
  min-height: 82px;
}

.save-dock input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.save-dock__actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.save-dock__actions button {
  background: var(--brand);
  white-space: nowrap;
}

.user-hero {
  background:
    linear-gradient(120deg, rgba(18, 128, 92, 0.14), rgba(255, 255, 255, 0.72) 34%),
    #fff;
}

.user-hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}

.admin-error {
  max-width: 1180px;
  margin: 18px auto 0;
  padding: 12px 14px;
  border: 1px solid rgba(180, 35, 24, 0.22);
  border-radius: 8px;
  background: #fff8f7;
  font-weight: 800;
}

.admin-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background .16s ease, border-color .16s ease, color .16s ease, transform .16s ease;
}

.admin-action:hover {
  border-color: color-mix(in srgb, var(--brand) 30%, var(--line));
  background: #fff8f4;
  color: var(--brand-dark);
}

.admin-action:active { transform: translateY(1px); }

.admin-action--primary {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}

.admin-action--primary:hover {
  background: var(--brand-dark);
  color: #fff;
}

.admin-action--sm {
  min-height: 32px;
  padding: 0 10px;
  font-size: 12px;
}

.admin-action--block {
  width: 100%;
  margin-top: 14px;
}

.user-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.user-summary-card {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.035);
}

.user-summary-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.user-summary-card strong {
  color: var(--ink);
  font-size: 26px;
  line-height: 1;
}

.user-create-panel,
.user-table-panel {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.04);
}

.user-create-panel {
  padding: 20px;
}

.user-create-panel__head,
.user-table-panel__head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: end;
  margin-bottom: 14px;
}

.user-create-panel__head h2,
.user-table-panel__head h2 {
  margin: 0;
  font-size: 20px;
}

.user-create-panel__head span,
.user-table-panel__head span {
  color: var(--muted);
  font-size: 13px;
}

.user-create-grid {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(160px, 1fr) 150px 130px auto;
  gap: 10px;
  align-items: end;
}

.user-create-grid label {
  display: grid;
  gap: 6px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.user-table-panel { padding: 0; overflow: hidden; }

.user-table-panel__head {
  margin: 0;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line-soft);
}

.user-search-form {
  display: flex;
  align-items: end;
  justify-content: flex-end;
  gap: 8px;
  min-width: min(100%, 420px);
}

.user-search-form label {
  display: grid;
  gap: 6px;
  min-width: 220px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.user-search-form label.compact-select {
  min-width: 92px;
}

.user-search-form input {
  height: 38px;
  padding-block: 0;
}

.user-empty-state {
  padding: 34px 20px 38px;
  text-align: center;
}

.user-empty-state h3 {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
}

.user-empty-state p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.user-table-scroll {
  width: 100%;
  overflow-x: auto;
}

.user-table {
  min-width: 980px;
  table-layout: fixed;
}

.user-table th,
.user-table td {
  vertical-align: middle;
  padding: 12px 14px;
}

.user-table th:nth-child(1) { width: 210px; }
.user-table th:nth-child(2) { width: 260px; }
.user-table th:nth-child(3) { width: 180px; }
.user-table th:nth-child(4) { width: 110px; }
.user-table th:nth-child(5),
.user-table th:nth-child(6) { width: 145px; }
.user-table th:nth-child(7) { width: 120px; }

.account-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.account-cell strong,
.account-cell span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.account-cell span {
  color: var(--muted);
  font-size: 12px;
}

.avatar-token {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  background: #1f2a3d;
  color: #fff;
  font-weight: 900;
}

.user-id-code {
  display: block;
  overflow: hidden;
  padding: 5px 7px;
  border-radius: 6px;
  background: #f5f7fb;
  color: #596579;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-row-form { margin: 0; }

.user-actions {
  display: flex;
  gap: 7px;
  align-items: center;
  justify-content: flex-start;
}

.role-badge,
.status-badge {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.role-badge--admin {
  background: #fff2e8;
  color: var(--brand-dark);
}

.role-badge--viewer {
  background: #edf4ff;
  color: var(--blue);
}

.role-badge--lesson_editor {
  background: #e9f7ef;
  color: var(--green);
}

.role-badge--qbank_operator,
.role-badge--qbank_reviewer {
  background: #fff6df;
  color: #a15c07;
}

.role-manager-panel { overflow: visible; }

.role-create-card {
  margin: 18px 20px 0;
  padding: 14px;
  border: 1px solid color-mix(in srgb, var(--brand) 22%, var(--line-soft));
  border-radius: 8px;
  background: #fffaf7;
}
.role-create-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.role-create-grid label {
  display: grid;
  gap: 6px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}
.role-create-grid__full { grid-column: 1 / -1; }
.role-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  padding: 18px 20px 20px;
}

.role-card {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
}
.role-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.role-card__head strong,
.role-card__head code { display: block; }
.role-card__head code {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}
.role-card__head button {
  min-height: 32px;
  padding: 0 12px;
  white-space: nowrap;
}
.role-card p {
  margin: 10px 0 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.role-card__count {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  background: #eef8f2;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.role-card__permissions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 16px;
  min-height: 36px;
  max-height: 84px;
  overflow: hidden;
}

.role-card__permissions span {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 8px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: #fff;
  color: #536072;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.role-card .admin-action--block {
  margin-top: auto;
  width: 100%;
}

.role-permissions {
  display: grid;
  gap: 8px;
  max-height: 360px;
  overflow: auto;
  padding-right: 4px;
}
.role-permissions--create {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  max-height: 260px;
  margin-top: 12px;
}

.permission-groups {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.permission-group {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
  overflow: hidden;
}

.permission-group[open] {
  border-color: color-mix(in srgb, var(--brand) 18%, var(--line));
  background: #fff;
}

.permission-group summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 58px;
  padding: 11px 13px;
  cursor: pointer;
  list-style: none;
}

.permission-group summary::-webkit-details-marker { display: none; }

.permission-group summary span {
  min-width: 0;
}

.permission-group summary strong,
.permission-group summary small {
  display: block;
}

.permission-group summary strong {
  color: var(--ink);
  font-size: 14px;
  line-height: 1.25;
}

.permission-group summary small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.permission-group summary em {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  background: #eef8f2;
  color: var(--green);
  font-size: 12px;
  font-style: normal;
  font-weight: 900;
  white-space: nowrap;
}

.permission-group__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 8px;
  padding: 0 12px 12px;
}

.permission-check {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 8px;
  border: 1px solid var(--line-soft);
  border-radius: 7px;
  background: #fff;
}
.permission-check input { margin-top: 2px; }
.permission-check strong,
.permission-check small { display: block; }
.permission-check strong {
  color: var(--ink);
  font-size: 13px;
}
.permission-check small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11.5px;
  overflow-wrap: anywhere;
}

.status-badge--active {
  background: #e9f7ef;
  color: var(--green);
}

.status-badge--inactive {
  background: #f2f5f9;
  color: var(--muted);
}

.audit-hero {
  background:
    linear-gradient(120deg, rgba(37, 99, 235, 0.12), rgba(255, 255, 255, 0.76) 36%),
    #fff;
}

.audit-filter-panel {
  margin-top: 20px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.035);
}

.audit-filter-form {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) minmax(130px, 1fr) minmax(130px, 1fr) minmax(180px, 1.35fr) 90px auto;
  gap: 10px;
  align-items: end;
}

.audit-filter-form label {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.audit-filter-form select,
.audit-filter-form input {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfe;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
}

.audit-filter-form__actions {
  display: flex;
  gap: 8px;
}

.audit-panel { overflow: hidden; }

.audit-table {
  min-width: 980px;
  table-layout: fixed;
}

.audit-table th,
.audit-table td {
  vertical-align: middle;
  padding: 12px 14px;
}

.audit-table th:nth-child(1) { width: 170px; }
.audit-table th:nth-child(2) { width: 120px; }
.audit-table th:nth-child(3) { width: 200px; }
.audit-table th:nth-child(4) { width: 130px; }
.audit-table th:nth-child(5) { width: 130px; }
.audit-table th:nth-child(6) { width: auto; }

.audit-table tbody tr {
  border-bottom: 1px solid var(--line-soft);
  background: #fff;
}

.audit-table tbody tr:last-child { border-bottom: 0; }
.audit-table tbody tr:hover { background: #fbfcfe; }

.audit-action {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: #edf4ff;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.audit-time {
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.audit-entity-cell {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}

.audit-entity-cell span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.audit-entity-cell code {
  max-width: 120px;
  overflow: hidden;
  padding: 3px 7px;
  border-radius: 6px;
  background: #f2f5f9;
  color: #596579;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.audit-summary-cell {
  color: #344054;
  font-size: 13px;
  word-break: break-word;
}

body.admin-modal-lock { overflow: hidden; }

.admin-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px;
}

.admin-modal[hidden] { display: none; }

.admin-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.42);
  opacity: 0;
  transition: opacity .16s ease;
}

.admin-modal__dialog {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  max-height: min(760px, calc(100vh - 44px));
  display: flex;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(17, 24, 39, 0.24);
  opacity: 0;
  transform: translateY(10px) scale(.98);
  transition: opacity .16s ease, transform .16s ease;
}

.admin-modal__dialog--wide {
  width: min(860px, 100%);
}

.admin-modal.is-open .admin-modal__backdrop { opacity: 1; }
.admin-modal.is-open .admin-modal__dialog { opacity: 1; transform: translateY(0) scale(1); }

.admin-modal__form {
  display: flex;
  flex: 1;
  min-height: 0;
  flex-direction: column;
}

.admin-modal__head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line-soft);
}

.admin-modal__head h2 {
  margin: 0;
  font-size: 20px;
}

.admin-modal__head span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.admin-modal__close {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.admin-modal__close:hover {
  background: #fff5f2;
  color: var(--brand-dark);
}

.admin-modal__body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 18px 20px;
}

.admin-modal__foot {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 20px;
  border-top: 1px solid var(--line-soft);
  background: #fbfcfe;
}

.admin-modal__note {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.admin-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.admin-form-grid label {
  display: grid;
  gap: 6px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.admin-form-grid__full { grid-column: 1 / -1; }

.user-role-selector {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.user-role-selector legend {
  margin-bottom: 7px;
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}

.user-role-selector__options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 8px;
}

.user-role-selector__options .permission-check {
  cursor: pointer;
}

.permission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 8px;
  margin-top: 14px;
}

table { width: 100%; border-collapse: collapse; }
th, td { padding: 11px 8px; border-bottom: 1px solid var(--line-soft); text-align: left; }
th { color: var(--muted); font-size: 13px; }

@media (max-width: 980px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-sidebar {
    position: static;
    height: auto;
    display: flex;
    overflow-x: auto;
    gap: 6px;
    padding: 10px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .lesson-sidebar .sidebar-title,
  .lesson-sidebar .sidebar-section { display: none; }
  .lesson-sidebar a { white-space: nowrap; }
  .lesson-main { padding: 22px 16px 54px; }
  .meta-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .metadata-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .model-compare-grid { grid-template-columns: 1fr; }
  .save-dock { grid-template-columns: 1fr; }
  .lesson-row { grid-template-columns: 1fr; }
  .lesson-row__actions { justify-content: start; flex-wrap: wrap; }
  .user-summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .user-create-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .user-search-form {
    justify-content: stretch;
    min-width: 0;
  }
  .user-search-form label { min-width: 0; }
  .audit-filter-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .list-page-size-form { width: 100%; margin-left: 0; }
  .audit-filter-form__actions { grid-column: 1 / -1; }
  .audit-table { min-width: 880px; }
}

@media (max-width: 640px) {
  .topbar { padding: 0 14px; }
  .brandmark { gap: 8px; }
  .brandmark__logo { width: 34px; height: 34px; }
  .brandmark strong { font-size: 15px; }
  .topnav__link {
    height: 32px;
    min-width: 0;
    padding: 0 10px;
    font-size: 13px;
  }
  .topnav__group { padding: 10px 0; }
  .topnav__submenu {
    left: auto;
    right: 0;
    transform: translateY(-4px);
  }
  .topnav__group:hover .topnav__submenu,
  .topnav__group:focus-within .topnav__submenu {
    transform: translateY(0);
  }
  .workspace-hero,
  .lesson-hero__content { display: grid; }
  .lesson-filters__head { display: grid; }
  .lesson-filter-form {
    grid-template-columns: repeat(5, minmax(132px, 1fr)) minmax(104px, auto);
    margin-inline: -2px;
    padding-inline: 2px;
  }
  .meta-grid,
  .metadata-grid,
  .refs-grid,
  .materials-grid,
  .source-materials-grid,
  .ref-actions,
  .body-image-uploader { grid-template-columns: 1fr; }
  .metadata-grid__wide,
  .metadata-grid__full { grid-column: 1; }
  .metadata-form__head { display: grid; }
  .content-card,
  .compound-card__item,
  .model-compare-card .content-card { grid-template-columns: 1fr; }
  .content-card > .body-images,
  .compound-card__item .body-images,
  .content-note,
  .quote-block { grid-column: 1; }
  .segment-transcript summary { padding: 12px; }
  .segment-transcript__body { padding: 14px; }
  .segment-transcript__text { font-size: 14px; line-height: 1.95; }
  .version-row { grid-template-columns: 1fr; }
  .save-dock__actions { justify-content: stretch; }
  .save-dock__actions .button,
  .save-dock__actions button { flex: 1; }
  .auth-card { padding: 22px; }
  .auth-card__head { gap: 14px; }
  .auth-logo {
    width: 86px;
    height: 86px;
    margin: -8px -2px 0 0;
  }
  .profile-card { padding: 22px; }
  .profile-card__head { align-items: flex-start; }
  .profile-form { grid-template-columns: 1fr; }
  .profile-actions { flex-direction: column-reverse; }
  .profile-actions .admin-action { width: 100%; }
  .topnav { gap: 6px; overflow: visible; }
  .user-create-panel__head,
  .user-table-panel__head,
  .user-create-grid { grid-template-columns: 1fr; display: grid; }
  .user-hero__actions { justify-content: stretch; }
  .user-hero__actions .workspace-stat,
  .user-hero__actions .admin-action { width: 100%; }
  .user-summary-grid,
  .audit-filter-form,
  .admin-form-grid,
  .permission-grid { grid-template-columns: 1fr; }
  .audit-filter-form__actions { grid-column: 1; }
  .list-pagination { align-items: stretch; flex-direction: column; }
  .list-pagination__actions { justify-content: stretch; }
  .list-pagination__actions > * { flex: 1; }
  .admin-form-grid__full { grid-column: 1; }
  .admin-modal { padding: 0; align-items: stretch; }
  .admin-modal__dialog {
    width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }
  .admin-modal__foot { flex-wrap: wrap; }
  .admin-modal__foot .admin-action { flex: 1; }
  .material-preview-modal {
    align-items: stretch;
    padding: 0;
  }
  .material-preview-modal__dialog {
    width: 100%;
    height: 100%;
    border-radius: 0;
  }
  .material-preview-modal__head h2 {
    max-width: calc(100vw - 88px);
  }
  .material-preview-modal__foot .button {
    width: 100%;
    justify-content: center;
  }
  .user-actions { flex-wrap: wrap; }
}

/* ===== 题库：上传 meta 表单 + 审核界面 inline 编辑 ===== */
.qb-upload__meta { border: none; padding: 0; margin: 14px 0 4px; }
.qb-upload__meta legend { font-weight: 600; font-size: 13px; color: var(--muted, #6b7280); padding: 0; margin-bottom: 8px; }
.qb-meta-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.qb-field { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted, #6b7280); }
.qb-field--full { grid-column: 1 / -1; }
.qb-field span em { color: var(--brand, #d44b2a); font-style: normal; margin-left: 2px; }
.qb-field input,
.qb-field select { height: 38px; padding: 0 10px; border: 1px solid var(--qb-border, #e5e7eb); border-radius: 8px; background: #fff; color: var(--ink, #1f2937); font-size: 14px; }
.qb-field input:focus,
.qb-field select:focus { outline: 2px solid var(--brand, #d44b2a); outline-offset: -1px; border-color: var(--brand, #d44b2a); }
.qb-meta-card { margin-bottom: 16px; }
.qb-meta-card .qb-meta-grid { padding: 16px 18px 18px; }
.qb-meta-card .qb-meta-groups { display: flex; flex-direction: column; gap: 12px; padding: 16px 18px 18px; }
.qb-meta-row { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.qb-meta-row--paper { grid-template-columns: repeat(3, minmax(150px, 1fr)); max-width: calc(60% - 4px); }
.qb-meta-row .qb-field--compact { max-width: 180px; }

@media (max-width: 900px) {
  .qb-meta-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qb-meta-row--paper { max-width: none; }
  .qb-meta-row .qb-field--compact { max-width: none; }
}

@media (max-width: 560px) {
  .qb-meta-row,
  .qb-meta-row--paper { grid-template-columns: minmax(0, 1fr); }
}

.qb-q__body { display: flex; flex-direction: column; gap: 12px; }
.qb-q__field { display: flex; flex-direction: column; gap: 4px; }
.qb-q__field > span { font-size: 12px; font-weight: 600; color: var(--muted, #6b7280); }
.qb-q__field textarea,
.qb-q__field input { width: 100%; padding: 8px 10px; border: 1px solid var(--qb-border, #e5e7eb); border-radius: 8px; background: #fff; color: var(--ink, #1f2937); font: inherit; resize: vertical; line-height: 1.5; box-sizing: border-box; }
.qb-q__field textarea:focus,
.qb-q__field input:focus { outline: 2px solid var(--brand, #d44b2a); outline-offset: -1px; border-color: var(--brand, #d44b2a); }
.qb-q__head .qb-q__type,
.qb-q__head .qb-q__diff { height: 30px; padding: 0 8px; border: 1px solid var(--qb-border, #e5e7eb); border-radius: 7px; background: #fff; font-size: 13px; }
.qb-q__head .qb-q__type { width: 118px; min-width: 92px; }
.qb-q__head .qb-q__type::placeholder { color: var(--muted, #9ca3af); }
.qb-q__row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.qb-steps { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.qb-steps li { display: flex; gap: 6px; align-items: center; }
.qb-steps li input { flex: 1; height: 34px; padding: 0 10px; border: 1px solid var(--qb-border, #e5e7eb); border-radius: 7px; background: #fff; }
.qb-steps-textarea {
  min-height: 92px;
  font-size: 13.5px;
}
.qb-steps__empty { color: var(--muted, #9ca3af); font-size: 13px; }
.qb-step__del { width: 30px; height: 30px; flex: 0 0 30px; border: none; background: #f3f4f6; color: #b91c1c; border-radius: 7px; cursor: pointer; font-size: 16px; line-height: 1; }
.qb-step__del:hover { background: #fee2e2; }
.qb-steps__add { align-self: flex-start; }
.qb-btn--xs { font-size: 12px; padding: 5px 10px; min-height: 30px; }

.qb-tag-picker { display: flex; flex-direction: column; gap: 8px; }
.qb-tag-picker__selected { display: flex; flex-wrap: wrap; gap: 6px; min-height: 34px; align-items: center; padding: 6px 8px; background: #fff7f5; border: 1px solid #fddcd6; border-radius: 7px; }
.qb-tag-chip { display: inline-flex; align-items: center; gap: 5px; max-width: 100%; height: 24px; padding: 0 6px; border-radius: 5px; background: #fff; border: 1px solid #f3c4b9; color: var(--ink, #1f2937); font-size: 12px; }
.qb-tag-chip em { font-style: normal; color: #b45309; font-weight: 700; }
.qb-tag-chip code { color: var(--brand, #d44b2a); font-size: 11px; }
.qb-tag-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.qb-tag-chip button { border: none; background: transparent; color: #9ca3af; cursor: pointer; font-size: 15px; line-height: 1; padding: 0 0 1px; }
.qb-tag-chip button:hover { color: #b91c1c; }
.qb-tag-picker__panel { border: 1px solid var(--qb-border, #e5e7eb); border-radius: 7px; background: #fff; overflow: hidden; }
.qb-tag-picker__search { position: relative; border-bottom: 1px solid #eef2f7; }
.qb-tag-picker__search input { width: 100%; height: 36px; padding: 0 34px 0 10px; border: none; outline: none; box-sizing: border-box; }
.qb-tag-picker__search input:focus { box-shadow: 0 0 0 2px rgba(212, 75, 42, .16) inset; }
.qb-tag-picker__clear-search { position: absolute; right: 7px; top: 7px; width: 22px; height: 22px; border: none; border-radius: 5px; background: #f3f4f6; color: #6b7280; cursor: pointer; line-height: 1; }
.qb-tag-picker__clear-search:hover { background: #fee2e2; color: #b91c1c; }
.qb-tag-picker__tree { max-height: 260px; overflow: auto; padding: 6px 0; }
.qb-tag-tree__row { --depth: 0; display: grid; grid-template-columns: 24px minmax(0, 1fr); align-items: center; gap: 3px; min-height: 32px; padding: 0 8px 0 calc(8px + var(--depth) * 22px); }
.qb-tag-tree__row:hover { background: #f8fafc; }
.qb-tag-tree__row.is-selected { background: #fff7f5; }
.qb-tag-tree__toggle { display: grid; place-items: center; width: 20px; height: 20px; padding: 0; border: 1px solid #d7dde7; border-radius: 50%; background: #f8fafc; color: #64748b; cursor: pointer; font-size: 16px; line-height: 1; font-weight: 700; }
.qb-tag-tree__toggle:disabled { visibility: hidden; cursor: default; }
.qb-tag-tree__label { display: flex; align-items: center; gap: 8px; min-width: 0; height: 30px; border: none; background: transparent; cursor: pointer; text-align: left; color: var(--ink, #1f2937); }
.qb-tag-tree__label:disabled { cursor: default; color: #64748b; }
.qb-tag-tree__label span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.qb-tag-tree__label mark { background: #fff1a8; color: inherit; padding: 0 1px; border-radius: 2px; }
.qb-tag-tree__label code { flex: 0 0 auto; color: var(--brand, #d44b2a); font-size: 11px; opacity: .82; }
.qb-tag-tree__empty { padding: 14px 12px; color: var(--muted, #9ca3af); font-size: 13px; }
.qb-muted { color: var(--muted, #9ca3af); font-size: 13px; }

.qb-btn.is-dirty { box-shadow: 0 0 0 2px var(--brand, #d44b2a) inset; }
.qb-feedback.is-error { color: #b91c1c; }
.qb-feedback.is-success { color: #047857; }

@media (max-width: 640px) {
  .qb-q__row { grid-template-columns: 1fr; }
  .qb-meta-grid { grid-template-columns: 1fr 1fr; }
}

/* 含公式字段：编辑框 + 实时预览框（左右并排） */
.qb-q__field--math .qb-edit-preview { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; align-items: stretch; }
.qb-edit-preview textarea { width: 100%; box-sizing: border-box; }
.qb-edit-preview__view { min-height: 84px; max-height: 320px; padding: 8px 10px; border: 1px dashed var(--qb-border, #e5e7eb); border-radius: 8px; background: #fafafa; overflow: auto; line-height: 1.6; color: var(--ink, #1f2937); white-space: pre-wrap; }
.qb-edit-preview__view .katex-error { color: inherit !important; }
.qb-edit-preview__view:empty::before { content: "预览区（公式自动渲染）"; color: var(--muted, #9ca3af); font-size: 12px; }
.qb-hint { color: var(--muted, #9ca3af); font-weight: 400; font-size: 11px; margin-left: 4px; }
.qb-solution-refine {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  margin-top: 10px;
}
.qb-solution-refine__btn {
  min-height: 36px;
  white-space: nowrap;
}
@media (max-width: 768px) {
  .qb-q__field--math .qb-edit-preview { grid-template-columns: 1fr; }
  .qb-solution-refine { grid-template-columns: 1fr; }
  .qb-solution-refine__btn { width: 100%; }
}

.qb-q__assets {
  display: grid;
  gap: 12px;
  padding: 0 18px 16px;
}
.qb-image-group {
  border: 1px solid var(--qb-edge-soft);
  border-radius: 10px;
  background: #fbfcfe;
  overflow: hidden;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.qb-image-group:focus,
.qb-image-group:focus-within {
  border-color: color-mix(in srgb, var(--brand) 55%, var(--qb-edge));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 14%, transparent);
  background: #fff;
}
.qb-image-group.is-uploading {
  border-color: color-mix(in srgb, var(--brand) 70%, var(--qb-edge));
  background: #f8fbff;
}
.qb-image-group--solution {
  background: #fffdfa;
}
.qb-image-group__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--qb-edge-soft);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}
.qb-image-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.qb-image-paste-hint {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 8px;
  border-radius: 7px;
  background: #eef6ff;
  color: #175cd3;
  font-size: 12px;
  font-weight: 800;
}
.qb-image-add {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--qb-edge);
  border-radius: 7px;
  background: #fff;
  color: var(--brand-dark);
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}
.qb-image-add input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.qb-image-group .qb-q__images {
  padding: 12px;
}
.qb-image-group .qb-q__images--solution {
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}
.qb-image-tile--editable {
  position: relative;
}
.qb-image-tile--editable a {
  display: block;
  min-width: 0;
}
.qb-image-tile__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.qb-image-delete {
  border: 0;
  border-radius: 6px;
  background: #fff1f0;
  color: #b42318;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}
.qb-image-delete:hover { background: #fee2e2; }
.qb-image-empty {
  display: grid;
  place-items: center;
  min-height: 64px;
  border: 1px dashed var(--qb-edge);
  border-radius: 8px;
  color: var(--muted);
  font-size: 13px;
}

/* ============================================================
   Question Bank — Upload Modal + compact form
   Dialog pattern · focus-trap friendly · progressive disclosure
   ============================================================ */
body.qb-modal-lock { overflow: hidden; }

.qb-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.qb-modal[hidden] { display: none; }
.qb-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(23, 32, 51, 0.48);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity .22s ease;
}
.qb-modal__dialog {
  position: relative;
  width: min(100%, 600px);
  max-height: min(90vh, 780px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 24px 64px rgba(23, 32, 51, 0.28);
  transform: translateY(10px) scale(0.97);
  opacity: 0;
  transition: transform .26s cubic-bezier(0.22, 1, 0.36, 1), opacity .2s ease;
}
.qb-modal.is-open .qb-modal__backdrop { opacity: 1; }
.qb-modal.is-open .qb-modal__dialog { transform: translateY(0) scale(1); opacity: 1; }

.qb-modal__form { display: flex; flex-direction: column; min-height: 0; flex: 1; }

.qb-modal__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 22px 16px;
  border-bottom: 1px solid var(--qb-edge-soft);
}
.qb-modal__head h2 { margin: 0; font-size: 18px; line-height: 1.25; }
.qb-modal__head > div > span { display: block; margin-top: 4px; color: var(--muted); font-size: 12.5px; }
.qb-modal__close {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border: 1px solid var(--qb-edge);
  border-radius: 9px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.qb-modal__close:hover { background: #fff5f2; color: var(--brand-dark); border-color: color-mix(in srgb, var(--brand) 32%, var(--qb-edge)); }
.qb-modal__close svg { width: 18px; height: 18px; }

.qb-modal__body {
  display: grid;
  gap: 14px;
  padding: 18px 22px;
  overflow-y: auto;
  min-height: 0;
}

.qb-docmode {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0;
  margin: 0;
  border: 0;
}
.qb-docmode legend {
  grid-column: 1 / -1;
  margin-bottom: 2px;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 800;
}
.qb-docmode__option {
  position: relative;
  display: grid;
  gap: 3px;
  min-height: 86px;
  padding: 12px 13px 12px 38px;
  border: 1px solid var(--qb-edge);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  transition: border-color .16s ease, box-shadow .16s ease, background .16s ease;
}
.qb-docmode__option:hover {
  border-color: #efb9a7;
  background: #fffaf7;
}
.qb-docmode__option.is-selected {
  border-color: rgba(212, 75, 42, 0.58);
  background: #fff7f2;
  box-shadow: inset 0 0 0 1px rgba(212, 75, 42, 0.18);
}
.qb-docmode__option input {
  position: absolute;
  left: 13px;
  top: 15px;
  width: 16px;
  height: 16px;
  accent-color: var(--brand);
}
.qb-docmode__option strong {
  font-size: 13.5px;
  line-height: 1.3;
}
.qb-docmode__option small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.qb-modal__foot {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 22px;
  border-top: 1px solid var(--qb-edge-soft);
  background: var(--qb-tint);
}

/* Dropzone — tightened for the modal context */
.qb-modal .qb-dropzone {
  min-height: 132px;
  padding: 18px;
  border-radius: 12px;
}
.qb-upload-rules {
  display: grid;
  gap: 5px;
  padding: 12px 14px;
  border: 1px solid #f1d4a5;
  border-left: 4px solid #d9822b;
  border-radius: 8px;
  background: #fff9ed;
  color: #68420d;
  font-size: 12.5px;
  line-height: 1.55;
}
.qb-upload-rules strong {
  color: #50330b;
  font-size: 13px;
}
.qb-upload-rules span {
  display: block;
}

/* ---------- Grouped fieldsets ---------- */
.qb-fieldset { border: none; padding: 0; margin: 0; }
.qb-fieldset > legend {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 0 0 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--qb-edge-soft);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 700;
}
.qb-fieldset > legend em {
  font-style: normal;
  padding: 2px 7px;
  border-radius: 999px;
  background: #fff0ea;
  color: var(--brand-dark);
  font-size: 11px;
  font-weight: 800;
}

/* ---------- Optional metadata section ---------- */
.qb-optional {
  display: grid;
  grid-template-rows: auto auto;
  border: 1px solid var(--qb-edge-soft);
  border-radius: 12px;
  background: var(--qb-tint);
  overflow: visible;
}
.qb-optional__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--qb-edge-soft);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
}
.qb-optional__head small { color: var(--muted); font-weight: 500; font-size: 12px; }
.qb-optional__grid { padding: 14px; }

/* ---------- Compact horizontal pipeline ---------- */
.qb-flow {
  display: flex;
  align-items: stretch;
  gap: 6px;
  margin: 4px 0 0;
  padding: 12px 14px;
  list-style: none;
  border-radius: 12px;
  background: linear-gradient(180deg, #fbfcfe, #f5f8fc);
  border: 1px solid var(--qb-edge-soft);
}
.qb-flow li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 1;
  min-width: 0;
}
.qb-flow li::after {
  content: "";
  flex: 0 0 16px;
  width: 16px;
  height: 2px;
  background: var(--qb-edge);
  border-radius: 2px;
}
.qb-flow li:last-child { flex: 0 0 auto; }
.qb-flow li:last-child::after { display: none; }
.qb-flow__no {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid color-mix(in srgb, var(--brand) 30%, var(--qb-edge));
  color: var(--brand-dark);
  font-size: 11px;
  font-weight: 800;
}
.qb-flow strong { display: block; font-size: 12.5px; line-height: 1.2; color: var(--ink); white-space: nowrap; }
.qb-flow small { display: block; margin-top: 2px; color: var(--muted); font-size: 11px; }

/* Modal — tighten grid so 2 columns read cleanly inside 600px */
.qb-modal .qb-meta-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.qb-modal .qb-field--full { grid-column: 1 / -1; }

@media (max-width: 560px) {
  .qb-modal { padding: 0; align-items: stretch; }
  .qb-modal__dialog { max-height: 100vh; height: 100%; border-radius: 0; }
  .qb-docmode { grid-template-columns: 1fr; }
  .qb-modal .qb-meta-grid { grid-template-columns: 1fr; }
  .qb-flow { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  .qb-modal__backdrop,
  .qb-modal__dialog { transition: opacity .15s ease; transform: none; }
}

/* Final practice item layout overrides: keep actions at the lower-right. */
.practice-question {
  grid-template-columns: 28px 34px minmax(0, 1fr);
  align-items: start;
}
.practice-question > div:not(.practice-question__actions) { grid-column: 3; }
.practice-question__actions {
  grid-column: 3;
  align-self: end !important;
  justify-self: end;
  display: flex;
  flex-direction: row;
  align-items: center !important;
  justify-content: flex-end;
  gap: 8px;
  width: auto;
  margin-top: 14px;
  padding-top: 0;
}
.practice-question__actions form { display: inline-flex; margin: 0; }
.practice-question__actions button {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 76px;
  white-space: nowrap;
}
@media (max-width: 560px) {
  .practice-question { grid-template-columns: 24px 30px minmax(0, 1fr); }
  .practice-question__actions { grid-column: 2 / 4 !important; width: 100%; }
}

/* ============================================================
   练习工作台 P2 / P3：以教师确认为核心的引导流程
   ============================================================ */
[hidden] { display: none !important; }

.training-hub,
.training-flow {
  display: grid;
  gap: 20px;
}

.training-hub .practice-hero {
  position: relative;
  isolation: isolate;
  min-height: 210px;
  overflow: hidden;
  background:
    radial-gradient(circle at 84% 12%, rgba(255, 196, 119, .28), transparent 30%),
    linear-gradient(125deg, #18283e 0%, #263a52 64%, #344b60 100%);
}
.training-hub .practice-hero::after {
  content: "5";
  position: absolute;
  right: 26px;
  bottom: -52px;
  z-index: -1;
  color: rgba(255,255,255,.055);
  font-family: Georgia, "Songti SC", serif;
  font-size: 210px;
  font-weight: 700;
  line-height: 1;
}
.training-hub .practice-hero p { max-width: 680px; }

.training-entry-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.training-entry {
  --entry-accent: #56687c;
  position: relative;
  display: grid;
  align-content: start;
  min-height: 230px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid #dfe5ec;
  border-top: 4px solid var(--entry-accent);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(31, 47, 67, .055);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.training-entry::after {
  content: "";
  position: absolute;
  right: -32px;
  bottom: -52px;
  width: 150px;
  height: 150px;
  border: 22px solid color-mix(in srgb, var(--entry-accent) 8%, transparent);
  border-radius: 50%;
}
.training-entry:hover {
  color: inherit;
  border-color: color-mix(in srgb, var(--entry-accent) 35%, #dfe5ec);
  box-shadow: 0 20px 42px rgba(31, 47, 67, .11);
  transform: translateY(-3px);
}
.training-entry.is-knowledge { --entry-accent: #087d72; }
.training-entry.is-question { --entry-accent: #d65832; }
.training-entry small {
  color: var(--entry-accent);
  font-size: 11px;
  font-weight: 950;
  letter-spacing: .08em;
}
.training-entry h2 {
  margin: 18px 0 5px;
  font-family: Georgia, "Songti SC", serif;
  font-size: 26px;
  line-height: 1.2;
}
.training-entry p {
  max-width: 310px;
  margin: 0;
  color: #667085;
  font-size: 14px;
}
.training-entry strong {
  align-self: end;
  margin-top: 30px;
  color: var(--entry-accent);
  font-size: 13px;
}

.training-flow > .practice-nav-btn {
  justify-self: start;
  border-color: #d9e1e9;
  background: #fff;
  color: #415168;
  box-shadow: 0 3px 10px rgba(30,45,65,.04);
}
.training-flow > .practice-nav-btn:hover {
  border-color: #bbcad7;
  background: #f8fafc;
  color: #1f334c;
}
.training-flow__head {
  position: relative;
  padding: 27px 30px 25px 34px;
  overflow: hidden;
  border-left: 6px solid #df5b34;
  border-radius: 4px 15px 15px 4px;
  background:
    linear-gradient(90deg, rgba(255,255,255,.98), rgba(247,249,252,.92)),
    repeating-linear-gradient(90deg, transparent 0 31px, rgba(35,50,73,.05) 32px);
  box-shadow: 0 12px 32px rgba(30,45,65,.075);
}
.training-flow__head > span {
  color: #c44c2b;
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .16em;
}
.training-flow__head h1 {
  margin: 7px 0 4px;
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(29px, 4vw, 39px);
  line-height: 1.15;
}
.training-flow__head p { margin: 0; color: #667085; }

.training-form {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  padding: 26px;
}
.training-form > * { min-width: 0; }
.training-form > .training-step,
.training-form > .training-search,
.training-form > .training-tag-results,
.training-form > .training-tag-picker,
.training-form > .practice-difficulty,
.training-form > .practice-form__name,
.training-form > .practice-generate,
.training-form > .training-upload,
.training-form > .training-text-input,
.training-form > .training-input-switch,
.training-form > .training-privacy,
.training-form > .training-warning,
.training-form > .seed-group { grid-column: 1 / -1; }

.training-step {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-top: 8px;
  padding-top: 18px;
  border-top: 1px solid #edf0f4;
}
.training-step:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.training-step > b {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border-radius: 50%;
  background: #24384f;
  color: #fff;
  font-family: Georgia, serif;
  font-size: 16px;
  box-shadow: 0 0 0 5px #edf2f6;
}
.training-step h2 { margin: 0; font-size: 17px; line-height: 1.3; }
.training-step p { margin: 3px 0 0; color: #778295; font-size: 12px; }

.training-scope-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.training-form label { display: grid; gap: 7px; }
.training-form label > span {
  color: #596579;
  font-size: 12px;
  font-weight: 900;
}
.training-form select,
.training-form input,
.training-form textarea {
  width: 100%;
  border: 1px solid #d7dfe8;
  border-radius: 9px;
  background: #fff;
  color: #243349;
  font: inherit;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.training-form select,
.training-form input { min-height: 43px; padding: 0 12px; }
.training-form textarea { padding: 12px 13px; line-height: 1.7; resize: vertical; }
.training-form select:focus,
.training-form input:focus,
.training-form textarea:focus {
  border-color: #dd7657;
  box-shadow: 0 0 0 3px rgba(221, 91, 52, .12);
}
.training-form :disabled { cursor: not-allowed; }
.training-form select:disabled,
.training-form input:disabled { background: #f2f5f8; color: #98a2b3; }

.training-search {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
}
.training-search > span { grid-column: 1 / -1; }
.training-search button {
  min-height: 43px;
  padding-inline: 22px;
  background: #24384f;
}
.training-search button:hover { background: #18283e; }
.training-search button:disabled { opacity: .45; }

.training-tag-results { display: grid; gap: 8px; }
.training-tag-picker {
  display: grid;
  gap: 10px;
}
.training-tag-picker__selected {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 58px;
  padding: 10px 14px;
  border: 1px solid #cfe3df;
  border-left: 4px solid #1e887d;
  border-radius: 10px;
  background: #f4fbf9;
}
.training-tag-picker__selected > span { color: #728092; font-size: 12px; }
.training-tag-picker__selected > div { display: grid; min-width: 0; gap: 2px; }
.training-tag-picker__selected strong { color: #176c63; font-size: 14px; }
.training-tag-picker__selected > div span { overflow: hidden; color: #657487; font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.training-tag-picker__selected > small { flex: 0 0 auto; color: #3c6c66; font-size: 11px; font-weight: 850; }
.training-tag-picker__panel {
  overflow: hidden;
  border: 1px solid #d8e0e8;
  border-radius: 11px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(31, 47, 67, .055);
}
.training-tag-picker__search { position: relative; padding: 10px; border-bottom: 1px solid #e9edf2; background: #f8fafc; }
.training-tag-picker__search input { min-height: 40px; padding-right: 42px; background: #fff; }
.training-tag-picker__search button {
  position: absolute;
  top: 18px;
  right: 18px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: #e9eef3;
  color: #657487;
  cursor: pointer;
  line-height: 1;
}
.training-tag-picker__search button:hover { background: #fde8e2; color: #ad3d24; }
.training-tag-picker__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px;
  gap: 10px;
  padding: 8px 14px 8px 46px;
  border-bottom: 1px solid #edf0f4;
  background: #fff;
  color: #8490a0;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .05em;
}
.training-tag-picker__head span:last-child { text-align: right; }
.training-tag-picker .training-tag-results {
  display: block;
  height: 360px;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 6px 0;
  scrollbar-gutter: stable;
}
.training-tag-picker .training-tag-results > .qb-empty { margin: 12px; }
.training-tag-tree__row {
  --depth: 0;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: stretch;
  min-height: 43px;
  padding-left: calc(10px + var(--depth) * 19px);
  border-bottom: 1px solid #f1f3f6;
}
.training-tag-tree__row:hover { background: #f8fafb; }
.training-tag-tree__row.is-selected { background: #edf8f5; box-shadow: inset 3px 0 0 #1e887d; }
.training-tag-tree__toggle {
  align-self: center;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  padding: 0;
  border: 1px solid #cad4df;
  border-radius: 50%;
  background: #fff;
  color: #52657a;
  cursor: pointer;
  font-size: 14px;
  font-weight: 900;
  line-height: 1;
}
.training-tag-tree__toggle:hover { border-color: #1e887d; color: #176c63; }
.training-tag-tree__toggle:disabled { visibility: hidden; }
.training-tag-tree__label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 6px 14px 6px 5px;
  border: 0;
  background: transparent;
  color: #26364a;
  text-align: left;
  cursor: pointer;
}
.training-tag-tree__label > span { display: grid; min-width: 0; gap: 1px; }
.training-tag-tree__label strong { overflow: hidden; font-size: 13px; font-weight: 850; text-overflow: ellipsis; white-space: nowrap; }
.training-tag-tree__label small { overflow: hidden; color: #8793a3; font-size: 10px; text-overflow: ellipsis; white-space: nowrap; }
.training-tag-tree__label em { color: #53677c; font-size: 11px; font-style: normal; font-weight: 850; text-align: right; white-space: nowrap; }
.training-tag-tree__label:hover strong { color: #176c63; }
.training-tag-tree__label:focus-visible { outline: 2px solid #df7657; outline-offset: -2px; border-radius: 5px; }
.training-tag-tree__row.is-branch .training-tag-tree__label { cursor: default; }
.training-tag-tree__row.is-branch .training-tag-tree__label strong { color: #667487; }
.training-tag-tree__row.is-branch .training-tag-tree__label em { color: #9aa4b1; font-weight: 700; }
.training-tag-option,
.seed-option {
  position: relative;
  display: grid;
  gap: 3px;
  width: 100%;
  padding: 13px 46px 13px 15px;
  border: 1px solid #dfe5ec;
  border-radius: 10px;
  background: #fff;
  color: #26364a;
  text-align: left;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
.training-tag-option::after,
.seed-option::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 15px;
  height: 15px;
  border: 2px solid #bdc7d3;
  border-radius: 50%;
  transform: translateY(-50%);
}
.training-tag-option:hover,
.seed-option:hover { border-color: #aebdca; background: #fafcfd; }
.training-tag-option.is-selected,
.seed-option.is-selected {
  border-color: #1e887d;
  background: #f1fbf8;
  box-shadow: inset 4px 0 0 #1e887d;
}
.training-tag-option.is-selected::after,
.seed-option.is-selected::after {
  border: 5px solid #1e887d;
  background: #fff;
}
.training-tag-option strong,
.seed-option strong { overflow-wrap: anywhere; font-size: 14px; line-height: 1.5; }
.training-tag-option span,
.seed-option span { color: #607086; font-size: 12px; }
.training-tag-option small { color: #8792a2; font-size: 11px; }
.qb-empty { margin: 0; padding: 18px; border: 1px dashed #ccd5df; border-radius: 9px; color: #7a8798; text-align: center; }

.training-input-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  justify-self: start;
  padding: 4px;
  border: 1px solid #dce3ea;
  border-radius: 10px;
  background: #f1f4f7;
}
.training-input-switch button { min-width: 150px; background: transparent; color: #69778a; }
.training-input-switch button.is-active { background: #24384f; color: #fff; box-shadow: 0 5px 14px rgba(30,45,65,.18); }
.training-upload {
  min-height: 250px;
  place-items: center;
  align-content: center;
  padding: 28px;
  overflow: hidden;
  border: 2px dashed #b8c5d2;
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(36,56,79,.035) 25%, transparent 25%) 0 0 / 22px 22px,
    #fbfcfd;
  text-align: center;
  transition: border-color .16s ease, background-color .16s ease, box-shadow .16s ease;
}
.training-upload:hover,.training-upload:focus-within { border-color: #df7657; background-color: #fffaf7; box-shadow:0 0 0 4px rgba(223,91,52,.08); }
.training-upload.has-image { border-style:solid; border-color:#78aa9e; background:#f8fcfb; }
.training-upload input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.training-upload__prompt{display:grid;place-items:center;gap:8px}.training-upload__prompt strong{font-size:17px}.training-upload__prompt>span{max-width:560px;color:#7a8798;font-size:12px}.training-upload.has-image .training-upload__prompt{display:none}.training-upload__actions{display:flex;justify-content:center;margin-top:9px}.training-upload__actions label{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 17px;border:1px solid #d95731;border-radius:9px;background:#d95731;color:#fff;font-size:12px;font-weight:900;cursor:pointer}.training-upload__actions label:hover{background:#c94a27}.training-upload__selected{display:grid;width:min(100%,680px);gap:10px}.training-upload__selected>div{display:flex;align-items:center;justify-content:space-between;gap:12px}.training-upload__selected span{overflow:hidden;color:#42536a;font-size:12px;font-weight:850;text-overflow:ellipsis;white-space:nowrap}.training-upload__selected button{flex:0 0 auto;min-height:34px;padding:0 12px;border:1px solid #e0aaa0;border-radius:8px;background:#fff6f4;color:#a93225;font-size:12px;font-weight:900;cursor:pointer}.training-upload__selected button:hover{border-color:#c64b39;background:#ffebe7}.training-upload__selected img{max-width:100%;max-height:420px;border:1px solid #d9e1e9;border-radius:9px;object-fit:contain;box-shadow:0 12px 30px rgba(30,45,65,.1)}.training-upload>small{max-width:620px;color:#788699;font-size:11px;line-height:1.55}.training-upload>small[data-state="success"]{color:#197361;font-weight:800}.training-upload>small[data-state="error"]{color:#b42318;font-weight:800}
.training-text-input textarea { min-height: 240px; }
.training-privacy { margin: -4px 0 0; padding: 11px 13px; border-left: 4px solid #d28a2f; background: #fff8e9; color: #76501f; font-size: 12px; }

.training-warning,
.training-error,
.training-success {
  padding: 18px;
  border-radius: 10px;
}
.training-warning { border: 1px solid #efd49c; background: #fff9eb; color: #674719; }
.training-warning ul { margin: 7px 0 0; padding-left: 20px; }
.training-tag-evidence {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px 14px;
  align-items: center;
  padding: 13px 15px;
  border: 1px solid #d8e9e5;
  border-left: 4px solid #1e887d;
  border-radius: 9px;
  background: #f4fbf9;
  color: #365d58;
  font-size: 12px;
}
.training-tag-evidence strong { color: #176c63; }
.training-tag-evidence small { color: #667085; white-space: nowrap; }
.training-error { border-left: 5px solid #b42318; }
.training-error h2,
.training-success h2 { margin-top: 0; }
.training-error a,
.training-success a { color: #c94f2d; font-weight: 900; }
.training-success { border-left: 5px solid #16816f; }

.seed-group { display: grid; gap: 8px; }
.seed-group h3 { margin: 5px 0 1px; color: #415168; font-size: 13px; }
.question-confirm .seed-option strong { font-weight: 750; }
.training-form > .practice-generate { justify-self: end; min-width: 230px; }

@media (max-width: 900px) {
  .training-entry-grid { grid-template-columns: 1fr; }
  .training-entry { min-height: 185px; }
  .training-scope-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .training-scope-grid > :last-child:nth-child(odd) { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .training-flow__head { padding: 22px 20px; }
  .training-form { grid-template-columns: 1fr; padding: 18px; }
  .training-scope-grid { grid-template-columns: 1fr; }
  .training-scope-grid > :last-child:nth-child(odd) { grid-column: auto; }
  .training-input-switch { width: 100%; }
  .training-input-switch button { min-width: 0; padding-inline: 8px; }
  .training-search { grid-template-columns: 1fr; }
  .training-search > span { grid-column: auto; }
  .training-tag-picker__selected { align-items: start; flex-direction: column; gap: 5px; }
  .training-tag-picker .training-tag-results { height: 320px; }
  .training-tag-tree__row { padding-left: calc(7px + var(--depth) * 15px); }
  .training-tag-tree__label { grid-template-columns: minmax(0, 1fr) 58px; padding-right: 9px; }
  .training-tag-picker__head { grid-template-columns: minmax(0, 1fr) 58px; padding-left: 42px; padding-right: 9px; }
  .training-form > .practice-generate { width: 100%; min-width: 0; }
  .training-upload { min-height: 210px; padding: 20px 14px; }
  .training-tag-evidence { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .training-entry,
  .training-tag-option,
  .seed-option { transition: none; }
}