/* 儒濟生 · 中醫溫書 — shared styles */

/* ---------- fonts ---------- */
@import url('https://cdn.jsdelivr.net/npm/lxgw-wenkai-webfont@1.1.0/style.css');

:root {
  --paper: #FBF8F1;
  --paper-2: #F4EEE3;
  --paper-3: #E8E0D2;
  --ink: #1F1B16;
  --ink-2: #4A4239;
  --ink-3: #6D6358;
  --cinnabar: #A83E2E;
  --cinnabar-light: #C75B49;
  --cinnabar-pale: #F7E9E6;
  --jade: #4D7A68;
  --jade-light: #E6F0EA;
  --gold: #B08D57;
  --gold-pale: #F5EFE3;
  --ink-blue: #3F5E7A;
  --ink-blue-pale: #E8EEF4;
  --plum: #6E4B6E;
  --plum-pale: #F2EAF2;
  --border: #E0D7C8;
  --shadow: 0 6px 24px rgba(31, 27, 22, 0.08);
  --radius: 12px;
  --font-serif: "LXGW WenKai", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
  font-size: 17px;
}

a { color: var(--cinnabar); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- progress bar ---------- */
#progressBar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--cinnabar);
  z-index: 2000;
  transition: width 0.1s linear;
}

/* ---------- navigation ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(251, 248, 241, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}

.brand-seal {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 4px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--ink-2);
  position: relative;
  padding: 4px 0;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--cinnabar);
  text-decoration: none;
}

.nav-links a.active::after,
.nav-links a:hover::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cinnabar);
  border-radius: 1px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--ink);
  cursor: pointer;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(31,27,22,0.72) 0%, rgba(31,27,22,0.25) 45%, rgba(31,27,22,0.12) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 24px 64px;
  width: 100%;
  color: #fff;
}

.hero-seal {
  position: absolute;
  right: 24px;
  bottom: 48px;
  width: clamp(100px, 18vw, 180px);
  height: auto;
  opacity: 0.18;
  filter: brightness(0) invert(1);
  pointer-events: none;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-eyebrow::before {
  content: "";
  width: 28px;
  height: 1.5px;
  background: var(--cinnabar-light);
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.15;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  opacity: 0.92;
  max-width: 640px;
  line-height: 1.6;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  opacity: 0.8;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ---------- layout ---------- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 72px 0;
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title .line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.section-intro {
  color: var(--ink-3);
  margin-bottom: 40px;
  max-width: 720px;
}

/* ---------- cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(31, 27, 22, 0.12);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.card-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cinnabar);
  font-weight: 600;
}

.card-status {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.status-active { background: var(--jade-light); color: var(--jade); }
.status-pending { background: var(--paper-3); color: var(--ink-3); }

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.95rem;
  color: var(--ink-3);
  line-height: 1.7;
  flex: 1;
}

.card-link {
  margin-top: 16px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cinnabar);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ---------- lesson list ---------- */
.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lesson-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: start;
  gap: 20px;
  transition: border-color 0.15s;
}

.lesson-item:hover {
  border-color: var(--cinnabar-light);
}

.lesson-item.pending {
  opacity: 0.72;
}

.lesson-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--paper-2);
  color: var(--cinnabar);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
}

.lesson-item.pending .lesson-num {
  background: var(--paper-3);
  color: var(--ink-3);
}

.lesson-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--ink);
}

.lesson-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--ink-3);
}

.lesson-excerpt {
  font-size: 0.92rem;
  color: var(--ink-3);
  margin-top: 6px;
  line-height: 1.65;
}

.lesson-action {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  white-space: nowrap;
}

.lesson-action.read {
  background: var(--cinnabar);
  color: #fff;
}

.lesson-action.wait {
  background: var(--paper-3);
  color: var(--ink-3);
}

/* ---------- about box ---------- */
.about-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}

.about-box h2 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.about-box p {
  color: var(--ink-2);
  margin-bottom: 1em;
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.7);
  padding: 48px 0;
  margin-top: 40px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a { color: rgba(255,255,255,0.85); }

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-seal {
  width: 40px;
  height: auto;
  opacity: 0.7;
  filter: brightness(0) invert(1);
}

/* ---------- article page ---------- */
.article-hero {
  padding: 56px 0 24px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

.article-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cinnabar);
  margin-bottom: 14px;
}

.article-hero h1 {
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  line-height: 1.2;
  font-weight: 700;
  max-width: 800px;
  margin: 0 auto 16px;
}

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--ink-3);
}

.breadcrumb {
  max-width: 760px;
  margin: 0 auto 24px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ink-3);
}

.breadcrumb a { color: var(--cinnabar); }

.article-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 100px;
}

.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5 {
  font-weight: 700;
  line-height: 1.35;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

.article-content h2 { font-size: 1.55rem; margin-top: 2em; }
.article-content h3 { font-size: 1.3rem; color: var(--cinnabar); }
.article-content h4 { font-size: 1.25rem; color: var(--cinnabar); }
.article-content h5 { font-size: 1.05rem; }

.preamble {
  font-size: 0.95rem;
  color: var(--ink-3);
  font-style: italic;
  margin-bottom: 1.5em;
}

.article-content p {
  color: var(--ink-2);
  margin-bottom: 1.4em;
}

.article-content strong { color: var(--ink); font-weight: 700; }

.article-content ul,
.article-content ol {
  margin: 0.8em 0 1.4em 1.4em;
  color: var(--ink-2);
}

.article-content li { margin-bottom: 0.5em; }

.article-content blockquote {
  border-left: 3px solid var(--cinnabar);
  padding: 1.1em 1.4em;
  margin: 1.6em 0;
  background: #fff;
  border-radius: 0 10px 10px 0;
  color: var(--ink-2);
  box-shadow: var(--shadow);
}

.article-content blockquote p:last-child { margin-bottom: 0; }

.callout {
  border-radius: 10px;
  padding: 1.1em 1.4em;
  margin: 1.6em 0;
  background: #fff;
  box-shadow: var(--shadow);
}

.callout-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.5em;
}

.callout-note { border-left: 3px solid var(--jade); background: var(--jade-light); }
.callout-note .callout-title { color: var(--jade); }

.callout-info { border-left: 3px solid var(--gold); background: var(--gold-pale); }
.callout-info .callout-title { color: var(--gold); }

.callout-danger { border-left: 3px solid var(--cinnabar); background: var(--cinnabar-pale); }
.callout-danger .callout-title { color: var(--cinnabar); }

hr {
  border: none;
  margin: 2em 0;
  text-align: center;
}
hr::after {
  content: "· · ·";
  color: var(--cinnabar);
  font-size: 1.2rem;
  letter-spacing: 0.5em;
}

.toc-container {
  margin: 2em 0;
  padding: 1.8em;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.toc-container h2 {
  margin-top: 0;
  font-size: 1.3rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.45em;
}

.toc-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.toc-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cinnabar);
  min-width: 2em;
}

.toc-list a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--paper-3);
  transition: border-color 0.15s, color 0.15s;
}

.toc-list a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
  text-decoration: none;
}

.table-wrapper {
  overflow-x: auto;
  margin: 1.6em 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}

.table-wrapper table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92em;
}

.table-wrapper th,
.table-wrapper td {
  padding: 0.65em 1em;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.table-wrapper th {
  background: var(--paper-2);
  font-weight: 700;
  color: var(--ink);
}

.table-wrapper tr:last-child td { border-bottom: none; }

.article-footer {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--ink-3);
}

/* ---------- subject portal cards (hub + reusable) ---------- */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.subject-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(31, 27, 22, 0.04);
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: inherit;
  text-decoration: none;
}

.subject-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(31, 27, 22, 0.10);
  text-decoration: none;
}

.subject-card .accent {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.subject-card h3 {
  font-size: 1.12rem;
  color: var(--ink);
  margin: 4px 0 2px;
}

.subject-card.jichu { border-top: 4px solid var(--cinnabar); }
.subject-card.jichu .accent { background: var(--cinnabar-pale); color: var(--cinnabar); }

.subject-card.zhenduan { border-top: 4px solid var(--jade); }
.subject-card.zhenduan .accent { background: var(--jade-light); color: var(--jade); }

.subject-card.zhongyao { border-top: 4px solid var(--gold, #a07d1c); }
.subject-card.zhongyao .accent { background: var(--gold-pale, #faf3dd); color: var(--gold, #a07d1c); }

.subject-card.fangji { border-top: 4px solid var(--ink-blue, #3F5E7A); }
.subject-card.fangji .accent { background: var(--ink-blue-pale, #E8EEF4); color: var(--ink-blue, #3F5E7A); }

.subject-card.placeholder { border-top: 4px dashed var(--border); opacity: 0.62; }
.subject-card.placeholder .accent { background: var(--paper-2); color: var(--ink-3); }

/* ---------- subject sub-hero / lesson section / footer (unified across topics) ---------- */
.sub-hero {
  border-bottom: 1px solid var(--border);
  padding: 64px 24px 48px;
  text-align: center;
}
.sub-hero .badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  font-family: var(--font-sans);
  margin-bottom: 14px;
  color: var(--paper);
  background: var(--accent, var(--cinnabar));
}
.sub-hero h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.4;
}
.sub-hero .subtitle {
  color: var(--ink-2);
  font-size: 1.05rem;
  max-width: 720px;
  margin: 0 auto 8px;
}
.sub-hero .meta {
  color: var(--ink-3);
  font-size: 0.9rem;
  font-family: var(--font-sans);
}
.sub-hero .meta a { color: var(--accent, var(--cinnabar)); margin-right: 14px; }

/* accent modifiers: set --accent / --accent-pale; gradient only applies when paired with .sub-hero */
.sub-hero--jichu { --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
.sub-hero--jichu.sub-hero { background: linear-gradient(135deg, var(--cinnabar-pale) 0%, var(--paper) 100%); }
.sub-hero--zhenduan { --accent: var(--jade); --accent-pale: var(--jade-light); }
.sub-hero--zhenduan.sub-hero { background: linear-gradient(135deg, var(--jade-light) 0%, var(--paper) 100%); }
.sub-hero--zhongyao { --accent: var(--gold, #a07d1c); --accent-pale: var(--gold-pale, #faf3dd); }
.sub-hero--zhongyao.sub-hero { background: linear-gradient(135deg, var(--gold-pale, #faf3dd) 0%, var(--paper) 100%); }
.sub-hero--fangji { --accent: var(--ink-blue, #3F5E7A); --accent-pale: var(--ink-blue-pale, #E8EEF4); }
.sub-hero--fangji.sub-hero { background: linear-gradient(135deg, var(--ink-blue-pale, #E8EEF4) 0%, var(--paper) 100%); }

.lesson-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px 24px 40px;
}
.lesson-section h2 {
  font-size: 1.45rem;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent, var(--cinnabar));
  display: flex;
  align-items: center;
  gap: 10px;
}
.lesson-section h2 .badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  font-weight: 600;
  background: var(--accent-pale, var(--cinnabar-pale));
  color: var(--accent, var(--cinnabar));
}
.lesson-section .lead {
  color: var(--ink-2);
  margin-bottom: 24px;
  font-size: 0.98rem;
  line-height: 1.7;
}

.subject-foot {
  text-align: center;
  padding: 40px 24px 64px;
  color: var(--ink-3);
  font-family: var(--font-sans);
  font-size: 0.88rem;
}
.subject-foot a { color: var(--cinnabar); margin: 0 8px; }

@media (max-width: 640px) {
  .sub-hero { padding: 40px 18px 32px; }
  .sub-hero h1 { font-size: 1.55rem; }
  .lesson-section { padding: 36px 18px; }
}

/* ---------- search box + results ---------- */
.search-input {
  width: 100%;
  max-width: 560px;
  padding: 14px 18px;
  font-size: 1.05rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
  outline: none;
  display: block;
}

.search-input:focus { border-color: var(--cinnabar); }

.search-results {
  margin-top: 16px;
  display: none;
  flex-direction: column;
  gap: 8px;
}

.search-result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.15s;
}

.search-result-item:hover {
  border-color: var(--cinnabar-light);
  text-decoration: none;
}

.search-result-title { font-weight: 600; }

.search-result-subject {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  white-space: nowrap;
}

.search-result-empty {
  padding: 12px 16px;
  color: var(--ink-3);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { border-bottom: 1px solid var(--border); }
  .nav-links li:last-child { border-bottom: none; }
  .nav-links a { display: block; padding: 12px 0; }
  .menu-toggle { display: block; }

  .lesson-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .lesson-action { justify-self: start; }

  .site-footer .container { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .section { padding: 48px 0; }
  .hero-content { padding: 48px 20px; }
  .about-box { padding: 24px; }
  .article-wrap { padding: 0 20px 80px; }
  .search-input { font-size: 0.95rem; padding: 12px 14px; }
}

/* ============================================================
   Session 3 — SPA index theme (reference: 中醫自學)
   warm paper · serif headings · cinnabar/jade/gold accents
   ============================================================ */

/* improve Traditional-Chinese rendering */
:root {
  --font-serif: "LXGW WenKai", "Noto Serif TC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans TC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

/* ---- top subject tabs (replaces old .site-nav on index) ---- */
.top-tabs {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 10px 24px;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
}
.top-tabs .tab {
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--ink-3);
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.top-tabs .tab:hover { background: var(--paper-2); color: var(--ink); }
.top-tabs .tab.active {
  color: #fff;
  background: var(--accent, var(--cinnabar));
  border-color: var(--accent, var(--cinnabar));
}
.top-tabs .tab.home-tab {
  font-weight: 600;
  color: var(--cinnabar);
  margin-right: 6px;
  border: 1px solid var(--border);
}
.top-tabs .tab.home-tab:hover { background: var(--cinnabar-pale); color: var(--cinnabar); }
.top-tabs .tab.locked {
  color: var(--ink-3);
  background: var(--paper-2);
  border: 1px dashed var(--border);
  cursor: not-allowed;
  opacity: .7;
}
.top-tabs .tab.locked::after {
  content: "準備中";
  font-size: 10px;
  margin-left: 6px;
  opacity: .75;
}
.top-tabs--jichu   { --accent: var(--cinnabar); }
.top-tabs--zhenduan { --accent: var(--jade); }
.top-tabs--zhongyao { --accent: var(--gold, #a07d1c); }
.top-tabs--fangji   { --accent: var(--ink-blue, #3F5E7A); }
.top-tabs--neike    { --accent: var(--plum, #6E4B6E); }

/* ---- compact lesson rows ---- */
.lesson-list { max-width: 880px; margin: 0 auto; padding: 28px 24px 16px; }
.lesson-row {
  display: block;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
}
.lesson-row:last-child { border-bottom: none; }
.lesson-row .title {
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--ink);
  text-decoration: none;
}
.lesson-row .title:hover { color: var(--accent, var(--cinnabar)); text-decoration: underline; }

/* ---- subject view container (SPA toggling) ---- */
.subject-view { display: none; }
.subject-view.active { display: block; }
.subject-view .view-head {
  max-width: 880px; margin: 0 auto; padding: 36px 24px 0; text-align: center;
}
.subject-view .view-head h2 {
  font-family: var(--font-serif); font-weight: 700; font-size: 1.7rem; color: var(--ink); margin: 0 0 6px;
}
.subject-view .view-head p { color: var(--ink-3); font-size: 14px; margin: 0; }

/* ---- future tools shelf — 極簡「準備中」標籤（2026-09-11）---- */
.tool-shelf {
  max-width: 880px; margin: 22px auto 0; padding: 16px 24px 0;
  border-top: 1px solid var(--border);
}
.tool-shelf h3 { display: none; }
/* 極簡行：文字串連，低調不搶眼 */
.tool-shelf--placeholder .tool-grid {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 0; row-gap: 6px;
}
.tool-shelf--placeholder .tool-grid::before {
  content: ""; width: 100%;
}
.tool-shelf--placeholder .tool-chip {
  position: static; display: inline-flex; align-items: center;
  background: none; border: none; border-radius: 0;
  padding: 0; margin: 0; filter: none; opacity: 1; cursor: default;
  font-family: var(--font-sans); font-size: 12.5px; letter-spacing: .06em;
  color: var(--ink-3);
}
.tool-shelf--placeholder .tool-chip + .tool-chip::before {
  content: "·"; margin: 0 10px; color: var(--border);
}
.tool-shelf--placeholder .tool-chip .t-badge { display: none; }
.tool-shelf--placeholder .tool-chip .t-name { white-space: nowrap; }
.tool-shelf--placeholder .tool-chip .t-desc { display: none; }
.tool-shelf--placeholder .tool-chip::after {
  content: "準備中"; margin-left: 6px;
  font-size: 10px; letter-spacing: .1em;
  color: var(--ink-3); opacity: .6;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 0 6px; line-height: 1.5;
}
/* 舊版 grid 保留（其他頁可能仍用 .tool-grid 但無 placeholder class） */
.tool-grid {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px;
}
.tool-chip {
  position: relative;
  display: flex; flex-direction: row; align-items: center; gap: 6px;
  padding: 7px 10px;
  background: var(--paper-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--ink-3);
  text-decoration: none;
  cursor: not-allowed;
  filter: grayscale(1);
  opacity: .62;
}
.tool-chip .t-name { font-family: var(--font-sans); font-weight: 500; font-size: 12.5px; white-space: nowrap; }
.tool-chip .t-desc { display: none; }
.tool-chip .t-badge {
  position: static; font-family: var(--font-sans); font-size: 9px; letter-spacing: .08em;
  padding: 1px 6px; border-radius: 999px;
  background: var(--paper-3); color: var(--ink-3);
}
@media (max-width: 640px) {
  .tool-grid { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
}
/* comparison app panel: takes over as main content when 對照表庫 is opened */
.zy-panel { padding-top: 4px; }
body.zy-mode .subject-view[data-subject="zhongyao"] .lesson-list,
body.zy-mode .subject-view[data-subject="zhongyao"] .view-head { display: none; }
.zy-back {
  display: inline-block; margin: 4px 0 10px;
  font-family: var(--font-sans); font-size: 13px;
  color: var(--accent, #a07d1c); text-decoration: none;
}
.zy-back:hover { text-decoration: underline; }

/* quiz panel: takes over as main content when 測驗 is opened */
.qz-panel { padding-top: 4px; --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
body.qz-mode .subject-view[data-subject="jichu"] .lesson-list,
body.qz-mode .subject-view[data-subject="jichu"] .view-head { display: none; }
.qz-back {
  display: inline-block; margin: 4px 0 10px;
  font-family: var(--font-sans); font-size: 13px;
  color: var(--cinnabar); text-decoration: none;
}
.qz-back:hover { text-decoration: underline; }

/* 工具架已統一為一行細版（見上方 .tool-shelf），唔再分模式切換 */

/* flashcards panel: takes over as main content when Flashcards 字卡 is opened */
.fc-panel { padding-top: 4px; --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
body.fc-mode .subject-view[data-subject="jichu"] .lesson-list,
body.fc-mode .subject-view[data-subject="jichu"] .view-head { display: none; }
.fc-back {
  display: inline-block; margin: 4px 0 10px;
  font-family: var(--font-sans); font-size: 13px;
  color: var(--cinnabar); text-decoration: none;
}
.fc-back:hover { text-decoration: underline; }

/* notes-tables panel: takes over as main content when 對照表庫 is opened (中基/診斷) */
.tbl-panel { padding-top: 4px; }
.tbl-panel--jichu { --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
.tbl-panel--zhenduan { --accent: var(--jade); --accent-pale: var(--jade-light); }
body.tbl-mode .subject-view[data-subject="jichu"] .lesson-list,
body.tbl-mode .subject-view[data-subject="jichu"] .view-head,
body.tbl-mode .subject-view[data-subject="zhenduan"] .lesson-list,
body.tbl-mode .subject-view[data-subject="zhenduan"] .view-head { display: none; }
.tbl-back {
  display: inline-block; margin: 4px 0 10px;
  font-family: var(--font-sans); font-size: 13px;
  color: var(--accent, var(--jade)); text-decoration: none;
}
.tbl-back:hover { text-decoration: underline; }

/* live tool chip (對照表庫 on 中藥學 / Flashcards 字卡 on 中醫基礎理論) */
.tool-chip-live--zhongyao { --accent: var(--gold, #a07d1c); --accent-pale: var(--gold-pale, #faf3dd); }
.tool-chip-live--jichu { --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
a.tool-chip-live {
  color: var(--ink);
  cursor: pointer;
  filter: none;
  opacity: 1;
  border-color: var(--accent);
  background: var(--accent-pale, var(--paper-2));
}
.tool-chip-live .t-badge { background: var(--accent); color: #fff; }
.tool-chip-live:hover { transform: translateY(-1px); box-shadow: 0 2px 10px rgba(0, 0, 0, .07); }

/* 工具掣統一外觀：全部用同一套朱砂色，唔跟科目變色（2026-09-10） */
.tool-shelf .tool-chip-live { --accent: var(--cinnabar); --accent-pale: var(--cinnabar-pale); }
.tool-shelf .tool-chip-live .t-name { font-size: 13px; font-weight: 500; }

/* ---- note-page slim top bar (self-contained, injected) ---- */
.note-topbar {
  position: sticky; top: 0; z-index: 999;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 7px 18px;
  background: #FBF8F1; border-bottom: 1px solid #E0D7C8;
  font-family: var(--font-sans, "Noto Sans SC", system-ui, sans-serif); font-size: 13px;
}
.note-topbar .nb-brand { font-weight: 700; color: #A83E2E; text-decoration: none; letter-spacing: .04em; }
.note-topbar a.nb-link { color: #4A4239; text-decoration: none; padding: 4px 10px; border-radius: 6px; }
.note-topbar a.nb-link:hover { background: #F7E9E6; color: #A83E2E; }
.note-topbar .nb-spacer { flex: 1; }

@media (max-width: 640px) {
  .top-tabs { padding: 8px 14px; gap: 3px; }
  .top-tabs .tab { font-size: 13px; padding: 6px 11px; }
  .lesson-list { padding: 20px 16px 8px; }
  .lesson-row { grid-template-columns: 28px 1fr; gap: 12px; padding: 11px 0; }
  .lesson-row .title { font-size: 15.5px; }
  .tool-grid { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
}

/* tool chip unavailable for the active subject (home: per-tab availability) */
.tool-chip-off { opacity: .32 !important; filter: grayscale(1) !important; cursor: not-allowed; }

/* ============================================================
   v2 — Home hero / subject page hero / footer (2026-09-10)
   ============================================================ */

/* ---- home hero ---- */
body.home-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(to bottom,
      rgba(251, 248, 241, 0) 0%,
      rgba(251, 248, 241, 0) 42%,
      rgba(251, 248, 241, 0.82) 78%,
      var(--paper) 100%),
    url("../images/hero.webp") center 40% / cover no-repeat var(--paper);
}
body.home-page main { margin-top: auto; }
.home-hero {
  position: relative;
  /* 山水畫已移至 body.home-page 鋪滿全屏，並於底部漸變淡出 */
  display: flex;
  align-items: flex-start;
}
/* home-hero 背景已移至 body.home-page，無需此處覆寫 */
/* 底部漸變已改由 body.home-page 背景處理 */
.home-hero-inner {
  position: relative; z-index: 2;
  max-width: 1100px; width: 100%;
  margin: 0 auto; padding: 23vh 24px 36px; text-align: center;
}
.home-hero .eyebrow {
  font-family: var(--font-sans);
  font-size: 12.5px; letter-spacing: .2em; color: var(--cinnabar);
  display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 18px;
}
.home-hero .eyebrow::before,
.home-hero .eyebrow::after { content: ""; width: 32px; height: 1.5px; background: var(--cinnabar); }
.home-hero h1 {
  font-family: "Songti SC", "SimSun", "STSong", "Noto Serif SC", "LXGW WenKai", serif;
  font-size: clamp(2.7rem, 6.6vw, 4.5rem);
  line-height: 1.28; font-weight: 400; color: var(--ink);
  letter-spacing: .06em; margin: 0;
}
.home-hero h1 .h1-seal {
  height: 1.75em; width: auto;
  margin-left: 20px; vertical-align: middle;
  transform: none;
  filter: drop-shadow(0 3px 8px rgba(168, 62, 46, .28));
}
@media (max-width: 640px) {
  .home-hero h1 .h1-seal { height: 1.35em; margin-left: 12px; }
}
.home-hero .hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--ink-2); max-width: 560px; line-height: 1.8; margin: 0;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; align-items: center; }
.hero-btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-size: 15px; font-weight: 600;
  padding: 12px 28px; border-radius: 999px; text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s, color .15s;
}
.hero-btn--primary {
  background: var(--cinnabar); color: #fff;
  box-shadow: 0 6px 18px rgba(168, 62, 46, .26);
}
.hero-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(168, 62, 46, .32); text-decoration: none; }
.hero-btn--ghost {
  border: 1.5px solid var(--border); color: var(--ink-2);
  background: rgba(255, 255, 255, .55);
}
.hero-btn--ghost:hover { border-color: var(--cinnabar); color: var(--cinnabar); text-decoration: none; }
@media (max-width: 640px) {
  .home-hero-inner { padding: 16vh 20px 32px; }
}

/* ---- subject page hero (v4 — 修正比例：容器貼近原圖, 2026-09-11) ---- */
.page-hero {
  position: relative;
  /* 容器比例由各科 hero 圖決定（見下方 .page-hero--{subject}），
     避免 cover 過度裁切令主體消失 */
  aspect-ratio: 2.05 / 1;
  max-height: 64vh;
  min-height: 300px;
  display: flex; align-items: flex-start; justify-content: center;
  overflow: hidden;
  background: var(--paper);
}
/* 各科按自己 hero 圖的原生比例設定，令主體完整不被裁 */
.page-hero--jichu    { aspect-ratio: 2.58 / 1; }
.page-hero--zhenduan { aspect-ratio: 2.58 / 1; }
.page-hero--zhongyao { aspect-ratio: 2.58 / 1; }
.page-hero--fangji   { aspect-ratio: 2.05 / 1; }
.page-hero--neike    { aspect-ratio: 2.5 / 1; }
.page-hero .ph-bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: center 58%;
}
/* 只保留必要的文字保護：標題區輕柔，底部只作極輕微溶接 */
.page-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to bottom,
    rgba(251, 248, 241, .70) 0%,
    rgba(251, 248, 241, .28) 20%,
    rgba(251, 248, 241, .02) 42%,
    rgba(251, 248, 241, .00) 70%,
    rgba(251, 248, 241, .18) 92%,
    rgba(251, 248, 241, .42) 100%);
}
.page-hero-inner {
  position: relative; z-index: 2;
  max-width: 1000px; width: 100%; margin: 0 auto;
  padding: 46px 24px 20px; text-align: center;
}
/* 標題區柔光襯底：範圍收窄，避免蓋住下方圖案 */
.page-hero-inner::before {
  content: ""; position: absolute; z-index: -1;
  left: 50%; top: 42%; transform: translate(-50%, -50%);
  width: min(680px, 88%); height: 108%;
  background: radial-gradient(ellipse at center,
    rgba(251, 248, 241, .90) 0%,
    rgba(251, 248, 241, .62) 46%,
    rgba(251, 248, 241, .16) 72%,
    rgba(251, 248, 241, 0) 100%);
  pointer-events: none;
}
/* kicker：同封面 .eyebrow 一樣，朱砂色＋左右細線 */
.page-hero .ph-kicker {
  font-family: var(--font-sans);
  font-size: 12.5px; letter-spacing: .22em; color: var(--cinnabar);
  display: flex; align-items: center; justify-content: center; gap: 12px;
  margin-bottom: 22px;
}
.page-hero .ph-kicker::before,
.page-hero .ph-kicker::after { content: ""; width: 32px; height: 1.5px; background: var(--cinnabar); }
/* 標題：宋楷 + 朱砂印章，與封面 h1 同款 */
.page-hero h1 {
  font-family: "Songti SC", "SimSun", "STSong", "Noto Serif SC", "LXGW WenKai", serif;
  font-size: clamp(2.2rem, 5.4vw, 3.5rem);
  line-height: 1.3; font-weight: 400; letter-spacing: .08em;
  color: var(--ink); margin: 0 0 16px;
  display: flex; align-items: center; justify-content: center; gap: 18px;
  flex-wrap: wrap;
}
.page-hero h1 .h1-seal {
  height: 1.55em; width: auto; vertical-align: middle;
  filter: drop-shadow(0 3px 8px rgba(168, 62, 46, .26));
}
.page-hero .ph-teacher {
  font-family: var(--font-sans); font-size: 14.5px; color: var(--ink-2);
  letter-spacing: .04em;
}
.page-hero .ph-teacher::before { content: "授課 · "; color: var(--cinnabar); font-weight: 600; }
@media (max-width: 640px) {
  .page-hero { aspect-ratio: 1.5 / 1; max-height: none; min-height: 260px; }
  .page-hero .ph-bg { object-position: center 58%; }
  .page-hero-inner { padding: 34px 20px 16px; }
  .page-hero h1 { gap: 10px; }
  .page-hero h1 .h1-seal { height: 1.3em; }
}

/* ---- home: subject entry cards (2026-09-10, 5 科版 2026-09-11) ---- */
.subject-cards {
  max-width: 1180px; margin: 0 auto;
  padding: 20px 24px 34px;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px;
}
@media (max-width: 1080px) { .subject-cards { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 700px)  { .subject-cards { grid-template-columns: repeat(2, 1fr); } }
.scard {
  display: flex; flex-direction: column; align-items: stretch;
  background: rgba(251, 248, 241, 0.88);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none; color: inherit;
  box-shadow: 0 2px 8px rgba(31, 27, 22, .04);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.scard:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(31, 27, 22, .12);
  border-color: var(--cinnabar-light);
  text-decoration: none;
}
.scard-img { display: block; flex: 0 0 auto; }
.scard-img img {
  display: block; width: 100%; height: auto; aspect-ratio: 4 / 3;
  object-fit: cover; object-position: center 40%;
}
.scard-body { padding: 10px 12px 12px; display: flex; flex-direction: column; justify-content: center; flex: 1; min-width: 0; }
.scard-body h2 { font-size: 0.95rem; font-weight: 700; color: var(--ink); margin: 0 0 2px; }
.scard-teacher {
  font-family: var(--font-sans); font-size: 11.5px; color: var(--cinnabar);
  font-weight: 600; margin: 0;
}
.scard-meta { font-family: var(--font-sans); font-size: 11.5px; color: var(--ink-3); margin: 0 0 9px; }
.scard-go {
  margin-top: auto; font-family: var(--font-sans); font-size: 12px;
  font-weight: 600; color: var(--cinnabar);
}
@media (max-width: 640px) {
  .subject-cards { padding: 16px 18px 22px; gap: 10px; }
}

/* ---- home: per-subject banner (same images as the subject pages) ---- */
.sv-banner {
  max-width: 880px; margin: 22px auto 0; padding: 0 24px;
}
.sv-banner img {
  display: block; width: 100%; height: 190px;
  object-fit: cover; object-position: center 32%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
@media (max-width: 640px) {
  .sv-banner { margin-top: 16px; }
  .sv-banner img { height: 130px; }
}

/* ---- footer ---- */
.home-footer {
  border-top: 1px solid var(--border);
  padding: 16px 24px 22px; text-align: center;
  font-family: var(--font-sans); font-size: 13px; color: var(--ink-3);
  background: var(--paper);
}
.home-footer .hf-seal {
  font-family: var(--font-serif); color: var(--cinnabar);
  font-weight: 700; margin-right: 10px; font-size: 14.5px;
}