:root,
[data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.72rem + 0.18vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.22vw, 1rem);
  --text-base: clamp(1rem, 0.96rem + 0.22vw, 1.08rem);
  --text-lg: clamp(1.12rem, 1rem + 0.5vw, 1.4rem);
  --text-xl: clamp(1.6rem, 1.26rem + 1vw, 2.2rem);
  --text-2xl: clamp(2.2rem, 1.5rem + 2.6vw, 3.8rem);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --color-bg: #efe3cf;
  --color-surface: #fbf5eb;
  --color-surface-2: #f5ecdf;
  --color-surface-offset: #e6d8bf;
  --color-ink: #2b231b;
  --color-text: #2b231b;
  --color-text-muted: #635748;
  --color-text-faint: #857667;
  --color-primary: #506b5b;
  --color-primary-hover: #3f5649;
  --color-primary-soft: #dbe6dc;
  --color-accent: #8d5f3a;
  --color-accent-soft: #ead5be;
  --color-border: rgba(58, 40, 24, 0.16);
  --color-divider: rgba(58, 40, 24, 0.08);
  --color-overlay: rgba(26, 19, 14, 0.62);
  --shadow-sm: 0 6px 18px rgba(40, 28, 18, 0.08);
  --shadow-md: 0 16px 40px rgba(40, 28, 18, 0.14);
  --shadow-lg: 0 24px 70px rgba(26, 18, 13, 0.18);
  --radius-sm: 0.5rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.2rem;
  --radius-xl: 1.75rem;
  --radius-pill: 999px;
  --font-body: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --font-display: 'Noto Serif TC', serif;
  --font-script: 'Ma Shan Zheng', cursive;
  --transition: 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg: #17120e;
  --color-surface: #211913;
  --color-surface-2: #2a2119;
  --color-surface-offset: #372b22;
  --color-ink: #f4eadc;
  --color-text: #f4eadc;
  --color-text-muted: #d0c3b1;
  --color-text-faint: #aa9986;
  --color-primary: #8fb19d;
  --color-primary-hover: #a8c3b3;
  --color-primary-soft: #324238;
  --color-accent: #cc9c69;
  --color-accent-soft: #4a3828;
  --color-border: rgba(255, 239, 221, 0.12);
  --color-divider: rgba(255, 239, 221, 0.08);
  --color-overlay: rgba(0, 0, 0, 0.7);
  --shadow-sm: 0 6px 18px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgba(102, 132, 114, 0.1), transparent 22%),
    linear-gradient(180deg, rgba(141,95,58,0.06), transparent 22%),
    var(--color-bg);
}

a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button, input { font: inherit; }
button { cursor: pointer; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-pill);
  z-index: 300;
}
.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.ink-wash {
  position: fixed;
  inset: auto;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  filter: blur(44px);
  pointer-events: none;
  opacity: 0.18;
}
.ink-a { top: -5rem; right: -6rem; background: rgba(80, 107, 91, 0.22); }
.ink-b { bottom: 10%; left: -6rem; background: rgba(141, 95, 58, 0.18); }

.site-shell {
  position: relative;
  width: min(1240px, calc(100% - 1rem));
  margin: 0 auto;
  padding: 1rem 0 4rem;
}

.site-header,
.panel,
.site-footer,
.toolbar,
.symptom-card,
.point-card,
.featured-point,
.index-card,
.routine-card,
.reference-item,
.detail-card,
.image-card,
.video-card,
.modal-shell,
.scroll-card {
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header {
  position: sticky;
  top: 1rem;
  z-index: 70;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-8);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
}
.brand-seal {
  width: 3.4rem;
  height: 3.4rem;
  color: var(--color-accent);
}
.brand-sub,
.section-kicker,
.modal-kicker {
  margin: 0 0 0.2rem;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
}
.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.quick-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.quick-nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.theme-toggle,
.modal-close {
  min-width: 44px;
  min-height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
}

.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr;
  gap: var(--space-6);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  border-radius: calc(var(--radius-xl) + 0.3rem);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(141,95,58,0.05) 45%, transparent 100%);
  pointer-events: none;
}
.hero-script {
  margin: 0 0 var(--space-3);
  font-family: var(--font-script);
  font-size: clamp(1.5rem, 1rem + 2vw, 2.6rem);
  color: var(--color-accent);
}
.hero h2,
.section-heading h2,
.references-section h2,
.disclaimer h2,
.modal-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.14;
}
.hero-text,
.section-note,
.modal-summary,
.prose-block p,
.prose-block li,
blockquote {
  color: var(--color-text-muted);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.8rem 1.3rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}
.button:hover,
.symptom-card:hover,
.point-card:hover,
.featured-point:hover,
.filter-chip:hover,
.theme-toggle:hover,
.modal-close:hover,
.video-preview:hover,
.quick-nav a:hover { transform: translateY(-2px); }
.button-primary {
  background: var(--color-primary);
  color: #fff;
}
.button-primary:hover { background: var(--color-primary-hover); }
.button-secondary {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.hero-scroll { display: flex; align-items: center; }
.scroll-card {
  width: 100%;
  padding: var(--space-5);
  border-radius: 1.4rem;
  background: linear-gradient(180deg, var(--color-surface), var(--color-surface-2));
}
.scroll-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-script);
  font-size: 1.8rem;
  color: var(--color-accent);
}
.scroll-card ul {
  margin: 0;
  padding-left: 1.2rem;
}

.toolbar,
.featured-section,
.references-section,
.disclaimer,
.guide-section {
  padding: var(--space-6);
  border-radius: var(--radius-xl);
}
.toolbar {
  margin: var(--space-8) 0;
  display: grid;
  gap: var(--space-4);
}
.search-wrap input {
  width: 100%;
  min-height: 52px;
  padding: 0 1rem;
  border-radius: 1rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
}
.filter-wrap,
.tag-list,
.inline-tags,
.guide-video-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.filter-chip,
.tag,
.tag-list span,
.guide-video-list a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  text-decoration: none;
}
.filter-chip.is-active,
.tab-button.is-active {
  background: var(--color-primary-soft);
  color: var(--color-text);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.section-heading h2 { font-size: var(--text-xl); }
.section-note { max-width: 42ch; margin: 0; }
.symptom-section,
.results-section,
.featured-section,
.guide-section,
.references-section,
.disclaimer { margin-bottom: var(--space-8); }
.symptom-grid,
.point-grid,
.featured-grid,
.index-grid {
  display: grid;
  gap: var(--space-4);
}
.symptom-grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.point-grid,
.featured-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.index-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

.symptom-card,
.point-card,
.featured-point,
.index-card,
.routine-card,
.reference-item,
.detail-card {
  padding: var(--space-5);
  border-radius: 1.35rem;
  text-align: left;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.symptom-card {
  min-height: 280px;
  background: linear-gradient(180deg, rgba(255,251,245,0.96), rgba(230,216,191,0.35));
}
.symptom-card h3,
.point-card h3,
.featured-point h3,
.index-card h4,
.routine-card h4,
.detail-card h3,
.video-meta h4,
.guide-block h3 {
  margin: 0;
  font-size: var(--text-lg);
  font-family: var(--font-display);
}
.card-top,
.card-bottom { display: grid; gap: var(--space-3); }
.card-icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: 1rem;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 1.2rem;
}
.point-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.trail {
  min-height: 1.5rem;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}
.empty-state {
  padding: var(--space-6);
  border-radius: 1.2rem;
  border: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  background: rgba(255,255,255,0.18);
}

.parchment {
  background:
    linear-gradient(180deg, rgba(251,245,235,0.96), rgba(245,236,223,0.92)),
    repeating-linear-gradient(180deg, transparent 0 30px, rgba(141,95,58,0.02) 30px 31px);
}
.guide-head { align-items: center; }
.prose-block {
  max-width: 78ch;
}
.guide-block + .guide-block {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.prose-block ul,
.prose-block ol {
  padding-left: 1.25rem;
}
.prose-block blockquote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--color-accent);
  background: rgba(141,95,58,0.06);
  border-radius: 0 1rem 1rem 0;
}
.sleep-routine-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}
.reference-list {
  display: grid;
  gap: var(--space-3);
}
.reference-item a {
  color: var(--color-primary);
  word-break: break-all;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-xl);
  color: var(--color-text-muted);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: 90;
}
.detail-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 100;
}
.modal-shell {
  width: min(1120px, 100%);
  max-height: min(92vh, 960px);
  overflow: auto;
  padding: var(--space-6);
  border-radius: 2rem;
  backdrop-filter: blur(12px);
}
.modal-close {
  position: sticky;
  top: 0;
  margin-left: auto;
}
.modal-header {
  display: grid;
  gap: var(--space-3);
  padding-right: 3rem;
}
.modal-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-5) 0;
}
.tab-button {
  min-height: 42px;
  padding: 0 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}
.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.single-column { grid-template-columns: 1fr; }
.detail-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
}
.media-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
.image-card {
  padding: var(--space-4);
  border-radius: 1.4rem;
}
.image-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 1rem;
  background: var(--color-surface-offset);
}
.image-card figcaption {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.video-stack { display: grid; gap: var(--space-4); }
.video-card {
  overflow: hidden;
  border-radius: 1.4rem;
}
.video-preview,
.video-frame {
  width: 100%;
  padding: 0;
  border: 0;
  background: var(--color-surface-offset);
}
.video-thumb,
.video-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.video-preview { position: relative; }
.play-badge {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(33, 25, 19, 0.76);
  color: #fff;
}
.video-meta {
  padding: var(--space-4);
  display: grid;
  gap: var(--space-2);
}

[hidden] { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 960px) {
  .site-header,
  .section-heading,
  .site-footer,
  .header-tools,
  .hero,
  .detail-grid,
  .media-layout,
  .sleep-routine-grid {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }
  .hero { display: grid; }
}

@media (max-width: 720px) {
  .site-shell { width: min(100% - 0.75rem, 100%); }
  .toolbar,
  .featured-section,
  .references-section,
  .disclaimer,
  .guide-section,
  .site-header { padding: var(--space-4); }
  .symptom-card { min-height: 240px; }
  .detail-modal {
    padding: 0;
    align-items: end;
  }
  .modal-shell {
    width: 100%;
    min-height: 100vh;
    max-height: 100vh;
    border-radius: 1.5rem 1.5rem 0 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}