@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --ink: #2c2c2c;
  --ink-light: #5a5a5a;
  --ink-faint: #8a8a8a;
  --paper: #f5f0e8;
  --paper-warm: #ede5d8;
  --paper-deep: #e2d9ca;
  --accent: #b8860b;
  --accent-light: rgba(184,134,11,0.1);
  --accent-red: #c0392b;
  --accent-blue: #2e6b8a;
  --accent-green: #4a7c59;
  --accent-teal: #2a7a6e;
  --accent-purple: #6b4c8a;
  --accent-gold: #b8860b;
  --star-color: #d4a843;
  --shadow-ink: rgba(44,44,44,0.08);
  --font-serif: 'Noto Serif SC','Songti SC',serif;
  --font-sans: 'Noto Sans SC','PingFang SC',sans-serif;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body { font-family:var(--font-sans); background:var(--paper); color:var(--ink); line-height:1.8; font-size:15px; }
body::before { content:''; position:fixed; inset:0; background:radial-gradient(ellipse at 20% 30%,rgba(180,160,130,0.06) 0%,transparent 50%),radial-gradient(ellipse at 75% 70%,rgba(160,140,110,0.04) 0%,transparent 40%); pointer-events:none; z-index:0; }

/* === 顶部导航 === */
.top-nav { position:sticky; top:0; z-index:100; background:rgba(245,240,232,0.92); backdrop-filter:blur(12px); border-bottom:1px solid rgba(44,44,44,0.1); padding:10px 20px; display:flex; align-items:center; gap:16px; }
.top-nav a { color:var(--ink-light); text-decoration:none; font-size:13px; transition:color 0.2s; }
.top-nav a:hover { color:var(--accent); }
.top-nav .sep { color:var(--ink-faint); font-size:11px; }
.top-nav .current { color:var(--ink); font-weight:500; }
.nav-meridians { margin-left:auto; display:flex; gap:5px; }
.nav-meridians a { width:28px; height:28px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:11px; background:var(--paper-warm); border:1px solid rgba(44,44,44,0.1); transition:all 0.2s; }
.nav-meridians a:hover, .nav-meridians a.active { background:var(--accent); color:#fff; border-color:var(--accent); }

/* === 容器 === */
.container { max-width:860px; margin:0 auto; padding:0 24px; position:relative; z-index:1; }

/* === 英雄区 === */
.hero { padding:60px 0 40px; text-align:center; }
.hero-badge { display:inline-flex; align-items:center; gap:6px; background:var(--accent-light); border:1px solid rgba(var(--accent-rgb,184,134,11),0.15); border-radius:20px; padding:4px 14px; font-size:12px; color:var(--accent); margin-bottom:20px; letter-spacing:1px; }
.hero h1 { font-family:var(--font-serif); font-size:40px; font-weight:700; letter-spacing:6px; margin-bottom:8px; }
.hero .subtitle { font-family:var(--font-serif); font-size:18px; color:var(--ink-light); letter-spacing:3px; margin-bottom:24px; }
.hero .meta-row { display:flex; justify-content:center; gap:20px; flex-wrap:wrap; }
.meta-tag { display:flex; align-items:center; gap:6px; font-size:13px; color:var(--ink-faint); background:var(--paper-warm); border-radius:6px; padding:6px 12px; }
.meta-tag .dot { width:6px; height:6px; border-radius:50%; flex-shrink:0; }

/* === 章节导航 === */
.section-nav { display:flex; gap:8px; padding:20px 0; overflow-x:auto; scrollbar-width:none; }
.section-nav::-webkit-scrollbar { display:none; }
.section-nav a { flex-shrink:0; padding:8px 16px; border-radius:20px; font-size:13px; text-decoration:none; color:var(--ink-light); background:var(--paper-warm); border:1px solid transparent; transition:all 0.25s; white-space:nowrap; }
.section-nav a:hover { border-color:var(--accent); color:var(--accent); }

/* === 模块 === */
.module { padding:48px 0; border-bottom:1px solid rgba(44,44,44,0.06); }
.module:last-child { border-bottom:none; }
.section-title { font-family:var(--font-serif); font-size:24px; font-weight:600; letter-spacing:2px; padding-bottom:12px; margin-bottom:24px; position:relative; }
.section-title::after { content:''; position:absolute; bottom:0; left:0; width:48px; height:2px; background:var(--accent); border-radius:1px; }
.section-subtitle { font-size:14px; color:var(--ink-faint); margin-top:-20px; margin-bottom:20px; }

/* === 名片卡 === */
.name-explain { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:16px; }
.name-part { text-align:center; padding:16px 12px; background:var(--paper-warm); border-radius:10px; border:1px solid rgba(44,44,44,0.05); }
.name-part .char { font-family:var(--font-serif); font-size:28px; font-weight:700; color:var(--accent); margin-bottom:4px; }
.name-part .meaning { font-size:13px; color:var(--ink-light); }
.profile-card { background:var(--paper-warm); border-radius:12px; padding:28px; border:1px solid rgba(44,44,44,0.06); position:relative; overflow:hidden; margin-top:24px; }
.profile-card .bg-char { position:absolute; right:-10px; top:-20px; font-family:var(--font-serif); font-size:160px; font-weight:700; color:rgba(44,44,44,0.03); pointer-events:none; line-height:1; }
.profile-card h3 { font-family:var(--font-serif); font-size:17px; font-weight:600; margin-bottom:4px; }
.profile-card .desc { font-size:14px; color:var(--ink-light); }
.profile-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:16px; }
.profile-item { padding:12px 16px; background:rgba(245,240,232,0.7); border-radius:8px; }
.profile-item .label { font-size:11px; color:var(--ink-faint); letter-spacing:2px; margin-bottom:4px; }
.profile-item .value { font-family:var(--font-serif); font-size:15px; font-weight:500; }
.metaphor-box { background:linear-gradient(135deg,rgba(var(--accent-rgb,184,134,11),0.06),rgba(var(--accent-rgb,184,134,11),0.02)); border-left:3px solid var(--accent); border-radius:0 8px 8px 0; padding:16px 20px; margin-top:20px; }
.metaphor-box p { font-size:14px; color:var(--ink-light); line-height:1.8; }

/* === 循行 === */
.flow-steps { display:flex; flex-direction:column; }
.flow-step { position:relative; padding:16px 20px 16px 36px; border-left:2px solid var(--paper-deep); }
.flow-step::before { content:''; position:absolute; left:-6px; top:22px; width:10px; height:10px; border-radius:50%; background:var(--paper-deep); border:2px solid var(--paper); }
.flow-step.active { border-left-color:var(--accent); }
.flow-step.active::before { background:var(--accent); }
.flow-step .step-tag { font-size:11px; color:var(--accent); letter-spacing:1px; margin-bottom:4px; }
.flow-step .step-text { font-size:14px; line-height:1.8; }
.flow-step .step-note { font-size:12px; color:var(--ink-faint); margin-top:6px; padding:8px 12px; background:var(--paper-warm); border-radius:6px; }

/* 古文 & 通用折叠 */
.classical-text { background:var(--paper-warm); border-radius:10px; padding:20px 24px; margin-top:24px; border:1px solid rgba(44,44,44,0.06); }
.toggle-btn { display:flex; align-items:center; gap:8px; background:none; border:none; font-family:var(--font-serif); font-size:14px; color:var(--ink-light); cursor:pointer; padding:0; transition:color 0.2s; }
.toggle-btn:hover { color:var(--accent); }
.toggle-btn .arrow { transition:transform 0.3s; font-size:10px; }
.toggle-btn.open .arrow { transform:rotate(90deg); }
.collapse { max-height:0; overflow:hidden; transition:max-height 0.4s ease; }
.collapse.show { max-height:3000px; }
.classical-inner { padding-top:16px; font-family:var(--font-serif); font-size:14px; line-height:2; color:var(--ink-light); }
.classical-inner .original { padding:12px 16px; background:rgba(44,44,44,0.03); border-radius:6px; margin-bottom:12px; letter-spacing:1px; }
.classical-inner .note { font-size:12px; color:var(--ink-faint); }

/* === 主治 === */
.symptom-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:16px; }
.symptom-category { padding:20px; border-radius:10px; border:1px solid rgba(44,44,44,0.06); }
.symptom-category h4 { font-family:var(--font-serif); font-size:15px; font-weight:600; margin-bottom:12px; display:flex; align-items:center; gap:8px; }
.icon-circle { width:28px; height:28px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:14px; flex-shrink:0; }
.symptom-category ul { list-style:none; }
.symptom-category li { font-size:14px; padding:5px 0; border-bottom:1px solid rgba(44,44,44,0.04); color:var(--ink-light); display:flex; align-items:baseline; gap:8px; }
.symptom-category li::before { content:'·'; color:var(--ink-faint); font-weight:700; }
.symptom-category li:last-child { border-bottom:none; }
/* 四色分类 */
.cat-a { background:rgba(var(--accent-rgb,184,134,11),0.04); }
.cat-a h4 { color:var(--accent); }
.cat-a .icon-circle { background:var(--accent-light); color:var(--accent); }
.cat-b { background:rgba(46,107,138,0.04); }
.cat-b h4 { color:var(--accent-blue); }
.cat-b .icon-circle { background:rgba(46,107,138,0.1); color:var(--accent-blue); }
.cat-c { background:rgba(107,76,138,0.04); }
.cat-c h4 { color:var(--accent-purple); }
.cat-c .icon-circle { background:rgba(107,76,138,0.1); color:var(--accent-purple); }
.cat-d { background:rgba(74,124,89,0.04); }
.cat-d h4 { color:var(--accent-green); }
.cat-d .icon-circle { background:rgba(74,124,89,0.1); color:var(--accent-green); }
.judgment-box { margin-top:20px; padding:16px 20px; background:linear-gradient(135deg,rgba(42,122,110,0.06),rgba(42,122,110,0.02)); border-left:3px solid var(--accent-teal); border-radius:0 8px 8px 0; }
.judgment-box h4 { font-family:var(--font-serif); font-size:14px; font-weight:600; color:var(--accent-teal); margin-bottom:8px; }
.judgment-box p { font-size:13px; color:var(--ink-light); line-height:1.8; }

/* === 穴位卡片 === */
.acupoint-controls { display:flex; gap:8px; margin-bottom:20px; flex-wrap:wrap; }
.filter-btn { padding:6px 14px; border-radius:16px; border:1px solid rgba(44,44,44,0.12); background:transparent; font-size:12px; color:var(--ink-light); cursor:pointer; font-family:var(--font-sans); transition:all 0.2s; }
.filter-btn:hover, .filter-btn.active { background:var(--accent); border-color:var(--accent); color:#fff; }
.point-group { margin-bottom:24px; }
.point-group-title { font-family:var(--font-serif); font-size:16px; font-weight:600; color:var(--accent); margin-bottom:12px; padding:8px 16px; background:var(--accent-light); border-radius:8px; display:flex; align-items:center; gap:8px; }
.point-group-title .badge { font-size:11px; background:rgba(var(--accent-rgb,184,134,11),0.2); padding:2px 8px; border-radius:8px; }
.acupoint-card { background:var(--paper-warm); border-radius:10px; margin-bottom:8px; border:1px solid rgba(44,44,44,0.06); overflow:hidden; transition:box-shadow 0.3s; }
.acupoint-card:hover { box-shadow:0 3px 16px var(--shadow-ink); }
.acupoint-card.starred .card-header { border-left:3px solid var(--star-color); }
.card-header { display:flex; align-items:center; padding:11px 16px; cursor:pointer; gap:10px; transition:background 0.2s; user-select:none; }
.card-header:hover { background:rgba(44,44,44,0.02); }
.card-num { width:28px; height:28px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:11px; font-weight:500; background:var(--accent-light); color:var(--accent); flex-shrink:0; }
.card-header .name-group { flex:1; min-width:0; }
.card-header .cn-name { font-family:var(--font-serif); font-size:15px; font-weight:600; }
.card-header .pinyin { font-size:11px; color:var(--ink-faint); }
.tags { display:flex; gap:4px; flex-wrap:wrap; }
.tag { font-size:10px; padding:2px 7px; border-radius:10px; letter-spacing:0.5px; white-space:nowrap; }
.tag-star { background:rgba(212,168,67,0.15); color:var(--accent-gold); }
.tag-type { background:var(--accent-light); color:var(--accent); }
.card-arrow { color:var(--ink-faint); font-size:11px; transition:transform 0.3s; flex-shrink:0; }
.acupoint-card.open .card-arrow { transform:rotate(90deg); }
.card-body { max-height:0; overflow:hidden; transition:max-height 0.45s ease; }
.card-body-inner { padding:0 16px 16px; }
.card-section { margin-bottom:12px; }
.card-section:last-child { margin-bottom:0; }
.card-section-title { font-size:12px; font-weight:500; color:var(--accent); letter-spacing:2px; margin-bottom:6px; display:flex; align-items:center; gap:6px; }
.card-section-title::before { content:''; width:12px; height:1px; background:var(--accent); }
.card-section p { font-size:13px; color:var(--ink-light); line-height:1.8; }
.tip-box { padding:10px 14px; background:rgba(74,124,89,0.06); border-radius:6px; font-size:13px; color:var(--accent-green); line-height:1.7; }
.warn-box { padding:10px 14px; background:rgba(192,57,43,0.05); border-radius:6px; font-size:13px; color:var(--accent-red); line-height:1.7; }

/* === 测验 === */
.quiz-card { background:var(--paper-warm); border-radius:12px; padding:24px; margin-bottom:16px; border:1px solid rgba(44,44,44,0.06); }
.quiz-num { font-size:11px; color:var(--accent); letter-spacing:2px; margin-bottom:8px; }
.quiz-question { font-family:var(--font-serif); font-size:15px; font-weight:500; margin-bottom:14px; line-height:1.7; }
.quiz-options { display:flex; flex-direction:column; gap:8px; }
.quiz-opt { padding:10px 16px; border-radius:8px; border:1px solid rgba(44,44,44,0.1); background:rgba(245,240,232,0.5); cursor:pointer; font-size:14px; color:var(--ink-light); transition:all 0.2s; display:flex; align-items:center; gap:10px; }
.quiz-opt:hover { border-color:var(--accent); color:var(--ink); }
.opt-letter { width:24px; height:24px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:12px; font-weight:500; background:rgba(44,44,44,0.05); flex-shrink:0; }
.quiz-opt.correct { border-color:var(--accent-green); background:rgba(74,124,89,0.08); color:var(--accent-green); }
.quiz-opt.correct .opt-letter { background:var(--accent-green); color:#fff; }
.quiz-opt.wrong { border-color:var(--accent-red); background:rgba(192,57,43,0.05); color:var(--accent-red); opacity:0.7; }
.quiz-opt.disabled { pointer-events:none; }
.quiz-explain { margin-top:12px; padding:12px 16px; background:rgba(74,124,89,0.06); border-radius:8px; font-size:13px; color:var(--accent-green); line-height:1.7; display:none; }
.quiz-explain.show { display:block; }
.quiz-score { text-align:center; padding:20px; font-size:14px; color:var(--ink-light); display:none; }

/* === 歌诀 === */
.rhyme-box { background:var(--paper-warm); border-radius:12px; padding:24px; border:1px solid rgba(44,44,44,0.06); position:relative; }
.rhyme-box .bg-char { position:absolute; right:20px; top:10px; font-family:var(--font-serif); font-size:80px; font-weight:700; color:rgba(44,44,44,0.03); pointer-events:none; }
.rhyme-line { font-family:var(--font-serif); font-size:14px; line-height:2.2; letter-spacing:1px; cursor:pointer; padding:2px 4px; border-radius:4px; transition:color 0.2s; }
.rhyme-line:hover { background:var(--accent-light); color:var(--accent); }
.rhyme-annotation { font-size:12px; color:var(--ink-faint); font-family:var(--font-sans); letter-spacing:0; padding:4px 12px; background:rgba(44,44,44,0.02); border-radius:6px; margin:2px 0 6px; display:none; line-height:1.6; }
.rhyme-annotation.show { display:block; }

/* === 延伸阅读 === */
.extend-grid { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-top:16px; }
.extend-card { padding:18px; border-radius:10px; background:var(--paper-warm); border:1px solid rgba(44,44,44,0.06); cursor:pointer; transition:all 0.25s; }
.extend-card:hover { box-shadow:0 4px 16px var(--shadow-ink); transform:translateY(-2px); }
.extend-card h4 { font-family:var(--font-serif); font-size:14px; font-weight:600; margin-bottom:6px; }
.extend-card > p { font-size:12px; color:var(--ink-faint); line-height:1.6; }
.extend-detail { max-height:0; overflow:hidden; transition:max-height 0.4s ease; }
.extend-detail.show { max-height:1000px; }
.extend-detail-inner { padding-top:12px; font-size:13px; color:var(--ink-light); line-height:1.8; border-top:1px solid rgba(44,44,44,0.06); margin-top:10px; }

/* === 底部导航 === */
.bottom-nav { display:flex; justify-content:space-between; padding:40px 0 60px; gap:16px; }
.bottom-nav a { display:flex; align-items:center; gap:10px; padding:16px 24px; border-radius:10px; background:var(--paper-warm); border:1px solid rgba(44,44,44,0.08); text-decoration:none; color:var(--ink); transition:all 0.25s; flex:1; max-width:48%; }
.bottom-nav a:hover { border-color:var(--accent); box-shadow:0 4px 16px var(--shadow-ink); }
.bottom-nav a:last-child { justify-content:flex-end; text-align:right; }
.nav-label { font-size:11px; color:var(--ink-faint); letter-spacing:1px; }
.nav-name { font-family:var(--font-serif); font-size:15px; font-weight:500; }
#back-top { position:fixed; bottom:24px; right:24px; width:40px; height:40px; border-radius:50%; background:var(--paper-warm); border:1px solid rgba(44,44,44,0.1); display:none; align-items:center; justify-content:center; cursor:pointer; box-shadow:0 2px 8px var(--shadow-ink); z-index:99; font-size:14px; color:var(--ink-faint); }

/* === 响应式 === */
@media(max-width:680px) {
  .hero h1 { font-size:28px; letter-spacing:4px; }
  .profile-grid, .symptom-grid, .name-explain, .extend-grid { grid-template-columns:1fr; }
  .nav-meridians { display:none; }
  .container { padding:0 16px; }
}