:root {
  color-scheme: light;
  --bg: #f6f9fd;
  --surface: #ffffff;
  --surface-soft: #f9fbff;
  --ink: #102033;
  --muted: #64748b;
  --line: #dbe5f1;
  --line-strong: #c7d5e6;
  --primary: #1769d3;
  --primary-dark: #0f4f9f;
  --primary-soft: #e8f1ff;
  --success: #12805c;
  --success-soft: #e8f8f1;
  --danger: #c03221;
  --danger-soft: #fff0ee;
  --warning: #b7791f;
  --warning-soft: #fff8e5;
  --shadow: 0 18px 44px rgba(22, 43, 72, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, #eef6ff 0, rgba(246, 249, 253, 0) 360px),
    var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
}

textarea {
  resize: vertical;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(219, 229, 241, 0.85);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.brand-block,
.header-actions,
.section-heading,
.quiz-actions,
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.product-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
}

.app-header h1,
.home-hero h2,
.panel h2,
.quiz-sidebar h2,
.question-panel h2,
.section-title h2 {
  margin: 0;
  letter-spacing: 0;
}

.app-header h1 {
  font-size: 24px;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  white-space: nowrap;
}

main {
  width: min(1200px, calc(100% - 32px));
  margin: 30px auto 72px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  align-items: stretch;
  margin-bottom: 18px;
}

.home-hero > div,
.metric-card,
.feature-tile,
.update-strip,
.panel,
.question-panel,
.quiz-sidebar {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.home-hero > div:first-child {
  padding: 34px;
}

.home-hero h2 {
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.04;
}

.hero-copy {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.today-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px;
}

.today-panel span,
.metric-card span,
.quiz-stat-grid span,
.result-card span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.today-panel strong {
  margin: 8px 0 16px;
  font-size: 46px;
}

.progress-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf6;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.metric-card {
  padding: 18px;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 30px;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  min-height: 150px;
  padding: 22px;
  text-align: left;
  color: var(--ink);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.feature-tile:hover,
.primary-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
}

.feature-tile span {
  font-size: 22px;
  font-weight: 900;
}

.feature-tile small {
  margin-top: 24px;
  color: var(--muted);
  line-height: 1.55;
}

.primary-tile {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #0b4b96);
}

.primary-tile small {
  color: #dbeafe;
}

.update-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
  padding: 20px 24px;
}

.update-strip h3 {
  margin: 0;
}

.update-strip strong {
  display: inline-flex;
  margin: 4px 4px 0;
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--primary-soft);
}

.panel {
  padding: 28px;
}

.section-title {
  margin-bottom: 20px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 800;
}

.toggle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 22px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.toggle-row input {
  width: auto;
  min-height: auto;
}

.official-subject-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.official-subject-card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  color: var(--ink);
}

.official-subject-card input {
  width: 18px;
  min-height: 18px;
  margin-top: 2px;
}

.official-subject-card strong,
.official-blueprint strong {
  display: block;
  color: var(--ink);
}

.official-subject-card small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.5;
}

.official-blueprint {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 22px;
}

.official-blueprint article {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.official-blueprint span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-weight: 800;
}

.primary-button,
.ghost-button,
.danger-button {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 900;
}

.primary-button {
  color: #fff;
  background: var(--primary);
}

.primary-button:hover {
  background: var(--primary-dark);
}

.ghost-button {
  color: var(--primary);
  border-color: var(--line-strong);
  background: #fff;
}

.danger-button {
  color: #fff;
  background: var(--danger);
}

.full-width {
  width: 100%;
}

.quiz-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
}

.quiz-sidebar {
  position: sticky;
  top: 98px;
  height: fit-content;
  padding: 20px;
}

.quiz-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.quiz-stat-grid article {
  min-height: 76px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.quiz-stat-grid strong {
  display: block;
  margin-top: 5px;
  font-size: 22px;
}

.question-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 0 0 16px;
}

.nav-dot {
  min-height: 36px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: #f1f5f9;
  font-weight: 900;
}

.nav-dot.answered {
  color: var(--success);
  background: var(--success-soft);
  border-color: rgba(18, 128, 92, 0.35);
}

.nav-dot.current {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}

.question-panel {
  padding: 28px;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.meta-chip {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: #f1f6fc;
  font-size: 13px;
  font-weight: 800;
}

.options-list {
  display: grid;
  gap: 12px;
  margin: 24px 0;
}

.option-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

.option-row input {
  width: auto;
  min-height: auto;
  margin-top: 5px;
}

.option-row.correct {
  border-color: rgba(18, 128, 92, 0.5);
  background: var(--success-soft);
}

.option-row.incorrect {
  border-color: rgba(192, 50, 33, 0.5);
  background: var(--danger-soft);
}

.feedback {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  line-height: 1.75;
}

.feedback-section {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.feedback-section:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.feedback-section h3 {
  margin: 0 0 6px;
  color: var(--primary-dark);
  font-size: 15px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.result-card,
.list-item,
.analytics-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.result-card strong {
  display: block;
  margin-top: 6px;
  font-size: 27px;
}

.summary-box,
.ai-analysis {
  padding: 18px;
  margin: 18px 0;
  border: 1px solid #bfdbfe;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  background: #eff6ff;
  line-height: 1.75;
}

.official-result {
  display: grid;
  gap: 18px;
}

.official-result h3 {
  margin: 0;
}

.official-result-head,
.official-insight-card,
.official-stat-row {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.official-result-head h3 {
  margin: 0 0 6px;
  font-size: 22px;
}

.official-result-head p {
  margin: 0;
}

.official-table {
  display: grid;
  gap: 10px;
}

.official-table.compact .official-stat-row {
  padding: 12px 14px;
}

.official-stat-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.4fr) minmax(160px, 2fr) 56px;
  align-items: center;
  gap: 14px;
}

.official-stat-row span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

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

.official-insight-grid section {
  display: grid;
  gap: 10px;
}

.official-insight-card span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
}

.coverage-summary-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.coverage-metric,
.coverage-card,
.coverage-gap-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.coverage-metric {
  padding: 16px;
}

.coverage-metric span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.coverage-metric strong {
  display: block;
  margin-top: 6px;
  font-size: 28px;
}

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

.coverage-card {
  padding: 18px;
}

.coverage-card h3 {
  margin: 0 0 14px;
}

.coverage-wide {
  grid-column: 1 / -1;
}

.coverage-chart {
  display: grid;
  gap: 10px;
}

.coverage-chart.compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.coverage-bar-row {
  display: grid;
  grid-template-columns: minmax(180px, 0.9fr) minmax(0, 1.5fr) 130px;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-soft);
}

.coverage-bar-row.warning {
  border-color: rgba(183, 121, 31, 0.45);
  background: var(--warning-soft);
}

.coverage-bar-row strong {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.coverage-bar-row span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

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

.coverage-gap-card {
  padding: 14px;
  background: var(--surface-soft);
}

.coverage-gap-card.warning {
  border-color: rgba(183, 121, 31, 0.45);
}

.coverage-gap-card h4 {
  margin: 0;
}

.coverage-gap-list {
  display: grid;
  gap: 8px;
  max-height: 360px;
  overflow: auto;
  padding-right: 4px;
}

.coverage-gap-list article {
  display: grid;
  gap: 4px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.coverage-gap-list span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.review-book {
  max-width: 1120px;
  margin: 0 auto;
}

.review-mode-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.review-mode-button {
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-weight: 900;
}

.review-mode-button.active {
  color: #fff;
  border-color: var(--primary);
  background: var(--primary);
}

.review-progress-card {
  display: grid;
  grid-template-columns: minmax(160px, 0.3fr) minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding: 16px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.review-progress-card span {
  color: var(--muted);
  font-weight: 800;
}

.review-progress-card strong {
  display: block;
  margin-top: 5px;
  font-size: 24px;
}

.review-book-content {
  display: grid;
  gap: 18px;
}

.review-ebook-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.review-ebook-toc {
  position: sticky;
  top: 18px;
  max-height: calc(100vh - 36px);
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.review-ebook-toc strong {
  display: block;
  margin-bottom: 10px;
  color: var(--ink);
}

.review-ebook-toc nav {
  display: grid;
  gap: 4px;
}

.review-ebook-toc a {
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 900;
  text-decoration: none;
}

.review-ebook-toc a:hover {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.review-ebook-toc .section-link {
  margin-left: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.review-ebook-main {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.review-chapter {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.review-material-chapter {
  display: grid;
  gap: 28px;
  padding: 34px;
  scroll-margin-top: 18px;
}

.review-material-chapter.is-read {
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(147, 197, 253, 0.22);
}

.review-chapter-heading,
.review-card-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.review-chapter-heading {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.review-chapter-heading h3,
.review-section h4,
.review-knowledge-card h5 {
  margin: 0;
}

.review-section {
  padding-top: 16px;
}

.review-section h4 {
  color: var(--primary-dark);
  font-size: 16px;
}

.review-knowledge-list {
  display: grid;
  gap: 12px;
  margin-top: 10px;
}

.review-knowledge-card {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.review-knowledge-card.is-read {
  border-color: #93c5fd;
  background: #eff6ff;
}

.review-quick-card {
  gap: 14px;
  background: #fff;
}

.review-quick-card .review-card-heading {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.review-card-heading span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.review-card-heading h5 {
  margin-top: 3px;
  font-size: 20px;
}

.review-note-block {
  display: grid;
  gap: 7px;
}

.review-note-block strong {
  color: var(--ink);
}

.review-note-block p,
.review-note-block ul {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.review-note-block ul {
  padding-left: 20px;
}

.review-material-block {
  display: grid;
  gap: 16px;
}

.review-material-block + .review-material-block {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.review-material-block h4,
.review-material-section h5 {
  margin: 0;
  color: var(--ink);
}

.review-material-block h4 {
  font-size: 22px;
}

.review-material-block p,
.review-material-block li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
}

.review-material-block p,
.review-material-block ul {
  margin: 0;
}

.review-material-block ul {
  padding-left: 20px;
}

.review-material-section {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.05);
  scroll-margin-top: 18px;
}

.review-material-section-heading {
  display: grid;
  gap: 8px;
}

.review-material-section h5 {
  font-size: 24px;
}

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

.review-lesson-block {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.review-lesson-block h6 {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
}

.review-lesson-block p,
.review-lesson-block li {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.review-lesson-block ul {
  margin: 0;
  padding-left: 20px;
}

.review-lesson-block.warning {
  border-color: #fde68a;
  background: #fffbeb;
}

.review-lesson-block.danger {
  border-color: #fecaca;
  background: #fef2f2;
}

.review-lesson-block.summary {
  border-color: #bfdbfe;
  background: #eff6ff;
}

.review-callout {
  display: grid;
  gap: 8px;
  padding: 13px;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  background: #eff6ff;
}

.review-callout strong,
.review-related-row span {
  color: var(--primary-dark);
  font-weight: 900;
}

.review-related-row,
.review-practice-box {
  display: grid;
  gap: 10px;
}

.review-section-practice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  background: #eff6ff;
}

.review-section-practice strong {
  display: block;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

.review-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.review-flow div {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  background: #eff6ff;
}

.review-flow span {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
}

.review-flow p {
  margin: 0;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 900;
  line-height: 1.45;
}

.review-table-wrap {
  overflow-x: auto;
}

.review-comparison-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.review-comparison-table th,
.review-comparison-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.65;
  text-align: left;
  vertical-align: top;
}

.review-comparison-table th {
  color: var(--ink);
  background: var(--surface-soft);
  font-size: 13px;
}

.review-comparison-table tr:last-child td {
  border-bottom: 0;
}

.review-scenario {
  display: grid;
  gap: 8px;
}

.review-scenario strong {
  color: var(--ink);
}

.review-comparison-list {
  display: grid;
  gap: 10px;
}

.review-comparison-list article {
  display: grid;
  gap: 6px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.review-comparison-list strong {
  color: var(--primary-dark);
}

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

.review-wrong-list article {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.review-wrong-list span {
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 900;
}

.review-wrong-list p {
  margin: 0;
}

.toolbar {
  flex-wrap: wrap;
  margin: 18px 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.toolbar label {
  min-width: 210px;
}

.question-list,
.bar-list,
.analytics-list,
.admin-list {
  display: grid;
  gap: 12px;
}

.list-item h3,
.analytics-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.list-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}

.bar-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 64px;
  gap: 12px;
  align-items: center;
}

.bar-track {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf6;
}

.bar-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
}

.knowledge-map {
  display: grid;
  gap: 10px;
  margin: 14px 0 24px;
}

.knowledge-base-shell,
.knowledge-admin-layout {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  min-height: 720px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow);
}

.knowledge-sidebar {
  min-width: 0;
  border-right: 1px solid var(--line);
  background: #f8fbff;
}

.knowledge-list {
  display: grid;
  gap: 10px;
  max-height: 720px;
  padding: 14px;
  overflow: auto;
}

.knowledge-card {
  display: grid;
  gap: 7px;
  width: 100%;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  text-align: left;
}

.knowledge-card.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 3px rgba(23, 105, 211, 0.1);
}

.knowledge-card span,
.knowledge-card small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.knowledge-card strong {
  color: var(--ink);
  font-size: 17px;
}

.knowledge-detail {
  min-width: 0;
  padding: 24px;
  overflow: auto;
}

.knowledge-detail-hero,
.knowledge-detail-block {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.knowledge-detail-hero h2,
.knowledge-detail-block h3 {
  margin: 0;
}

.knowledge-detail-hero p,
.knowledge-detail-block p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.knowledge-group {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.knowledge-group h4 {
  margin: 0 0 12px;
}

.node-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.node-button {
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--primary-dark);
  background: #fff;
  font-weight: 800;
}

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

.future-grid article {
  padding: 18px;
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  background: var(--surface-soft);
  font-weight: 900;
}

.future-grid span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.admin-shell {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
}

.admin-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
  background: #fbfdff;
}

.admin-header h2 {
  margin: 0;
}

.admin-header .muted {
  margin: 6px 0 0;
}

.admin-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.admin-tabs {
  display: flex;
  gap: 6px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: #fbfdff;
}

.admin-tab {
  min-height: 46px;
  padding: 0 14px;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  background: transparent;
  font-weight: 900;
}

.admin-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.admin-tab-panel {
  display: none;
}

.admin-tab-panel.active {
  display: block;
}

.import-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--muted);
  background: #f8fafc;
  font-weight: 900;
}

.import-button input {
  display: none;
}

.admin-layout {
  display: grid;
  grid-template-columns: 380px minmax(0, 1fr);
  min-height: 720px;
}

.admin-sidebar {
  min-width: 0;
  border-right: 1px solid var(--line);
  background: #f8fbff;
}

.admin-filter-card {
  position: sticky;
  top: 82px;
  z-index: 2;
  display: grid;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 251, 255, 0.94);
  backdrop-filter: blur(10px);
}

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

.admin-filter-grid label {
  font-size: 12px;
}

.admin-list {
  display: grid;
  gap: 10px;
  max-height: 720px;
  padding: 14px;
  overflow: auto;
}

.admin-question-card {
  display: grid;
  gap: 9px;
  width: 100%;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  text-align: left;
  box-shadow: 0 5px 18px rgba(15, 79, 159, 0.04);
}

.admin-question-card:hover {
  border-color: #b7cdf0;
  transform: translateY(-1px);
}

.admin-question-card.active {
  border-color: var(--primary);
  background: #edf5ff;
  box-shadow: 0 0 0 3px rgba(23, 105, 211, 0.12);
}

.admin-card-id {
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 900;
}

.admin-question-card strong {
  display: -webkit-box;
  overflow: hidden;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.admin-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.admin-card-tags span {
  padding: 4px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #f8fafc;
  font-size: 12px;
  font-weight: 800;
}

.admin-editor {
  display: grid;
  align-content: start;
  gap: 16px;
  min-width: 0;
  max-height: 820px;
  padding: 18px;
  overflow: auto;
  background: #fff;
}

.admin-form-section,
.admin-preview {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.admin-form-section h3,
.admin-preview h3 {
  margin: 0;
  font-size: 16px;
}

.admin-section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.admin-section-heading > span:not(.status-pill) {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

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

.admin-field-grid.compact {
  grid-template-columns: 180px;
}

.admin-preview {
  position: sticky;
  bottom: 0;
  background: #f8fbff;
}

.admin-preview-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.admin-preview-card h4 {
  margin: 0;
  font-size: 19px;
  line-height: 1.55;
}

.admin-preview-options {
  display: grid;
  gap: 9px;
}

.admin-preview-options div {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.admin-preview-options .is-answer {
  border-color: rgba(18, 128, 92, 0.5);
  background: var(--success-soft);
}

.admin-preview-answer {
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--success);
  background: var(--success-soft);
  font-weight: 900;
}

.factory-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 18px;
  background: #fff;
}

.factory-card,
.draft-review-panel,
.draft-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.factory-card h3,
.draft-review-panel h3,
.draft-card h4 {
  margin: 0;
}

.factory-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.import-status {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: #f8fafc;
  font-weight: 800;
}

.import-status.is-ok {
  color: var(--success);
  border-color: rgba(18, 128, 92, 0.35);
  background: var(--success-soft);
}

.pdf-drop-zone {
  display: grid;
  place-items: center;
  min-height: 160px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  color: var(--muted);
  background: #f8fafc;
  text-align: center;
}

.pdf-drop-zone input {
  display: none;
}

.draft-review-panel {
  margin: 0 18px 18px;
  background: #fbfdff;
}

.draft-list {
  display: grid;
  gap: 12px;
}

.draft-card {
  background: #fff;
}

.quality-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
  gap: 16px;
  padding: 18px;
  background: #fff;
}

.quality-card {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.quality-card h3 {
  margin: 0;
}

.quality-summary-card,
.quality-review-list-card {
  grid-column: 1 / -1;
}

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

.quality-metric {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
}

.quality-metric span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.quality-metric strong {
  display: block;
  margin-top: 6px;
  font-size: 28px;
}

.quality-list,
.quality-question-list,
.quality-bars {
  display: grid;
  gap: 10px;
}

.quality-list-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fafc;
}

.quality-list-item p {
  flex-basis: 100%;
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.quality-list-item.warning {
  border-color: rgba(183, 121, 31, 0.45);
  background: var(--warning-soft);
}

.quality-bar-item {
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(0, 1fr) 110px;
  gap: 12px;
  align-items: center;
}

.quality-question-row {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) 190px;
  gap: 12px;
  align-items: center;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  text-align: left;
}

.quality-question-row.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 3px rgba(23, 105, 211, 0.1);
}

.quality-question-row span,
.quality-question-row em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
  font-weight: 800;
}

.quality-question-row strong {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.preview-mode-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.preview-mode {
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-weight: 900;
}

.preview-mode.active {
  color: #fff;
  border-color: var(--primary);
  background: var(--primary);
}

.quality-preview {
  display: grid;
  justify-content: center;
}

.quality-preview-card {
  display: grid;
  gap: 14px;
  width: 100%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.quality-preview.mobile .quality-preview-card {
  max-width: 390px;
  border-color: #a8c4ea;
  box-shadow: 0 18px 50px rgba(16, 32, 51, 0.12);
}

.quality-preview.exam .quality-preview-card {
  border-color: #b8c7d9;
  background: #fcfcfd;
}

.quality-preview-card h4 {
  margin: 0;
  font-size: 20px;
  line-height: 1.6;
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--muted);
}

@media (max-width: 980px) {
  .home-hero,
  .metric-grid,
  .action-grid,
  .form-grid,
  .toggle-grid,
  .official-subject-grid,
  .official-blueprint,
  .official-insight-grid,
  .coverage-summary-grid,
  .coverage-dashboard-layout,
  .coverage-chart.compact,
  .coverage-gap-grid,
  .review-progress-card,
  .review-ebook-layout,
  .review-lesson-grid,
  .review-flow,
  .quiz-shell,
  .result-grid,
  .future-grid,
  .admin-layout,
  .knowledge-base-shell,
  .knowledge-admin-layout,
  .factory-layout,
  .quality-layout,
  .quality-summary-grid,
  .admin-field-grid {
    grid-template-columns: 1fr;
  }

  .quiz-sidebar {
    position: static;
  }

  .review-ebook-toc {
    position: static;
    max-height: 280px;
  }

  .bar-item {
    grid-template-columns: 1fr;
  }

  .quality-summary-card,
  .quality-review-list-card {
    grid-column: auto;
  }

  .quality-bar-item,
  .official-stat-row,
  .coverage-bar-row,
  .quality-question-row {
    grid-template-columns: 1fr;
  }

  .admin-layout {
    min-height: 0;
  }

  .admin-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .knowledge-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .admin-filter-card {
    position: static;
  }

  .admin-list,
  .knowledge-list,
  .admin-editor {
    max-height: none;
  }

  .admin-preview {
    position: static;
  }
}

@media (max-width: 720px) {
  .app-header,
  .header-actions,
  .section-heading,
  .admin-header,
  .admin-toolbar,
  .update-strip,
  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .review-chapter-heading,
  .review-card-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .review-material-chapter {
    padding: 20px;
  }

  .review-material-section {
    padding: 18px;
  }

  .review-section-practice {
    align-items: stretch;
    flex-direction: column;
  }

  .review-wrong-list article {
    grid-template-columns: 1fr;
  }

  .brand-block {
    align-items: flex-start;
  }

  .home-hero > div:first-child,
  .panel,
  .question-panel {
    padding: 22px;
  }

  .admin-filter-grid {
    grid-template-columns: 1fr;
  }

  .admin-tabs {
    overflow-x: auto;
    padding: 0 14px;
  }

  .factory-actions,
  .factory-card,
  .draft-review-panel {
    align-items: stretch;
  }

  .admin-shell {
    border-radius: 10px;
  }
}