:root {
  --bg: #efe7da;
  --panel: rgba(255, 251, 245, 0.9);
  --panel-strong: rgba(255, 248, 239, 0.98);
  --line: #d8c7b1;
  --text: #2d241c;
  --muted: #756553;
  --accent: #8a3b12;
  --accent-strong: #5b2208;
  --accent-soft: #efdbc8;
  --shadow: 0 18px 40px rgba(87, 58, 30, 0.08);
  --shadow-strong: 0 24px 60px rgba(87, 58, 30, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(180, 115, 60, 0.18), transparent 26%),
    radial-gradient(circle at 85% 15%, rgba(111, 76, 45, 0.12), transparent 22%),
    linear-gradient(180deg, #f7f3eb 0%, #efe7db 100%);
  font-family: "STKaiti", "Kaiti SC", "Songti SC", serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: 42px 20px 80px;
}

.page-narrow {
  max-width: 1020px;
}

.hero,
.panel {
  border: 1px solid rgba(138, 59, 18, 0.12);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero {
  padding: 34px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) 290px;
  gap: 24px;
}

.hero-side {
  display: grid;
  gap: 14px;
}

.hero-card,
.metric-card {
  padding: 22px;
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(255, 250, 244, 0.98), rgba(245, 228, 210, 0.94));
  border: 1px solid rgba(138, 59, 18, 0.1);
}

.hero-card span,
.metric-card span,
.period-row span,
.glyph-meta span,
.timeline-caption,
.recommend-card span,
.intro,
.stat-note,
.bullet-list,
.empty-inline {
  color: var(--muted);
}

.hero-card strong,
.metric-card strong {
  display: block;
  margin-top: 10px;
  font-size: 40px;
  line-height: 1;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p,
ul {
  margin-top: 0;
}

h1 {
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.05;
  margin-bottom: 18px;
}

h2 {
  font-size: clamp(32px, 4vw, 44px);
  margin-bottom: 14px;
}

h3 {
  font-size: clamp(22px, 2vw, 30px);
  margin-bottom: 0;
}

.intro {
  max-width: 760px;
  font-size: 18px;
  line-height: 1.75;
}

.sample-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.sample-links a,
.sibling-list a,
.ghost-button,
.tag {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 248, 241, 0.8);
  color: var(--accent);
}

.sample-links a,
.sibling-list a,
.ghost-button,
.zoom-button,
.lightbox-close,
.filter-form button {
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.sample-links a:hover,
.sibling-list a:hover,
.ghost-button:hover,
.zoom-button:hover,
.lightbox-close:hover,
.filter-form button:hover {
  transform: translateY(-1px);
}

.panel {
  margin-top: 24px;
  padding: 28px;
}

.search-workbench {
  background:
    linear-gradient(140deg, rgba(255, 251, 245, 0.96), rgba(245, 235, 224, 0.92));
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 18px;
}

.section-head.compact {
  margin-bottom: 22px;
}

.filter-form {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(3, minmax(150px, 1fr)) auto;
  gap: 14px;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  color: var(--muted);
  font-size: 15px;
}

.field input,
.field select {
  min-width: 0;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
}

.filter-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.filter-form button,
.ghost-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 52px;
}

.filter-form button {
  padding: 0 24px;
  border: none;
  border-radius: 18px;
  background: linear-gradient(135deg, #8a3b12, #b15b26);
  color: #fffaf5;
  cursor: pointer;
  box-shadow: 0 12px 24px rgba(138, 59, 18, 0.18);
}

.practice-head {
  margin-bottom: 24px;
}

.practice-intro {
  max-width: 860px;
  margin-top: 12px;
  margin-bottom: 0;
}

.practice-shell {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
}

.practice-sidebar {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 249, 242, 0.86);
  border: 1px solid rgba(138, 59, 18, 0.1);
}

.practice-sidebar-title {
  margin-bottom: 14px;
  color: var(--muted);
}

.practice-char-list {
  display: grid;
  gap: 10px;
}

.practice-char-button,
.practice-question,
#practice-complete {
  border: none;
  cursor: pointer;
}

.practice-char-button {
  display: flex;
  flex-direction: column;
  align-items: start;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  transition: transform 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.practice-char-button strong {
  font-size: 24px;
}

.practice-char-button span,
.practice-question,
.practice-empty,
.practice-detail-card span,
.practice-ai-card span,
.practice-ai-card small {
  color: var(--muted);
}

.practice-char-button.is-active,
.practice-question.is-active {
  background: linear-gradient(135deg, #8a3b12, #b15b26);
  color: #fffaf5;
  box-shadow: 0 14px 26px rgba(138, 59, 18, 0.16);
}

.practice-char-button.is-active span,
.practice-question.is-active {
  color: #fff2e7;
}

.practice-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 20px;
}

.practice-board,
.practice-result {
  margin-top: 0;
}

.practice-board {
  padding: 24px;
  border-radius: 26px;
  border: 1px solid rgba(138, 59, 18, 0.12);
  background:
    radial-gradient(circle at top, rgba(166, 110, 60, 0.08), transparent 34%),
    rgba(255, 251, 245, 0.92);
}

.practice-board-top,
.practice-result-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.practice-actions,
.practice-question-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

#practice-complete {
  min-height: 52px;
  padding: 0 22px;
  border-radius: 18px;
  background: linear-gradient(135deg, #8a3b12, #b15b26);
  color: #fffaf5;
  box-shadow: 0 12px 24px rgba(138, 59, 18, 0.18);
}

#practice-complete:disabled {
  opacity: 0.7;
  cursor: wait;
}

.practice-canvas-wrap {
  position: relative;
  margin-top: 22px;
  aspect-ratio: 1 / 1;
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid rgba(138, 59, 18, 0.12);
  background:
    linear-gradient(rgba(138, 59, 18, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 59, 18, 0.08) 1px, transparent 1px),
    #f8f1e7;
  background-size: 25% 25%, 25% 25%, auto;
}

#practice-reference,
#practice-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#practice-reference {
  object-fit: contain;
  padding: 10%;
  opacity: 0.18;
  filter: sepia(1) saturate(0.8);
  pointer-events: none;
}

#practice-canvas {
  touch-action: none;
}

.practice-question-row {
  margin-top: 18px;
}

.practice-question {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 247, 238, 0.86);
}

.practice-empty {
  line-height: 1.8;
}

.practice-detail-grid {
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(0, 1fr);
  gap: 16px;
  margin-top: 18px;
}

.practice-detail-card,
.practice-ai-card {
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(138, 59, 18, 0.1);
  background: rgba(255, 252, 247, 0.92);
}

.practice-detail-card img {
  width: 100%;
  margin-top: 10px;
  border-radius: 16px;
  background: #f7f0e6;
}

.practice-detail-card p,
.practice-ai-card p,
.practice-ai-card small {
  line-height: 1.7;
}

.practice-ai-card {
  margin-top: 16px;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.metric-card p {
  margin-bottom: 0;
}

.dossier {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 20px;
}

.tag-board {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-content: start;
}

.results-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  margin-top: 24px;
}

.results-main,
.results-side {
  min-width: 0;
}

.side-panel h3 {
  margin-bottom: 14px;
}

.bullet-list {
  padding-left: 18px;
  line-height: 1.7;
  margin-bottom: 0;
}

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

.period-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 252, 247, 0.88);
}

.glyph-grid,
.feature-grid,
.recommend-grid {
  display: grid;
  gap: 16px;
}

.glyph-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.recommend-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.glyph-card,
.feature-grid article,
.recommend-card,
.timeline-item {
  position: relative;
  padding: 16px;
  border: 1px solid rgba(138, 59, 18, 0.12);
  border-radius: 22px;
  background: rgba(255, 252, 247, 0.9);
}

.product-card {
  padding-top: 52px;
}

.glyph-card img,
.timeline img,
.recommend-card img,
.detail-image img,
.lightbox img {
  width: 100%;
  display: block;
  border-radius: 16px;
  background: #f7f0e6;
}

.glyph-meta,
.recommend-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.glyph-meta a {
  color: var(--accent);
}

.zoom-button {
  position: absolute;
  right: 16px;
  top: 14px;
  padding: 8px 12px;
  border: 1px solid rgba(138, 59, 18, 0.16);
  border-radius: 999px;
  background: rgba(255, 248, 241, 0.96);
  color: var(--accent);
  cursor: pointer;
}

.zoom-button.in-detail {
  top: 12px;
  right: 12px;
  z-index: 2;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}

.timeline-rich small {
  margin-top: 8px;
  color: var(--muted);
}

.timeline-period {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 14px;
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(280px, 400px) minmax(0, 1fr);
  gap: 24px;
}

.detail-image {
  position: relative;
  align-self: start;
}

.back-link {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--accent);
}

@media (max-width: 1080px) {
  .practice-shell,
  .practice-stage,
  .dossier,
  .results-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .practice-board-top,
  .practice-result-head,
  .filter-form {
    grid-template-columns: 1fr;
    display: grid;
  }

  .practice-detail-grid,
  .summary-strip {
    grid-template-columns: 1fr;
  }

  .practice-shell {
    gap: 16px;
  }
}

.sibling-list {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.empty-state {
  text-align: center;
}

.empty-inline {
  padding: 24px;
  border-radius: 18px;
  background: rgba(255, 247, 238, 0.92);
}

.lightbox[hidden] {
  display: none;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  background: rgba(27, 16, 8, 0.78);
  backdrop-filter: blur(6px);
}

.lightbox-inner {
  max-width: min(900px, 100%);
  max-height: calc(100vh - 60px);
  padding: 18px;
  border-radius: 24px;
  background: var(--panel-strong);
  box-shadow: var(--shadow-strong);
}

.lightbox-inner img {
  max-height: calc(100vh - 180px);
  object-fit: contain;
}

.lightbox-inner p {
  margin: 12px 4px 0;
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 24px;
  padding: 10px 16px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 248, 241, 0.96);
  color: var(--accent-strong);
  cursor: pointer;
}

@media (max-width: 980px) {
  .hero-grid,
  .dossier,
  .results-layout,
  .detail-layout,
  .summary-strip {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .page {
    padding: 24px 14px 40px;
  }

  .hero,
  .panel {
    padding: 20px;
    border-radius: 20px;
  }

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

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

  .glyph-grid,
  .feature-grid,
  .recommend-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .lightbox {
    padding: 14px;
  }

  .lightbox-close {
    top: 12px;
    right: 14px;
  }
}