/* ============================================================
   人体使用说明书 · 代谢篇 — 全局样式
   主色调：琥珀橙 (#92400e → #d97706)
   能量感 / 温暖 / 代谢主题
   ============================================================ */

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

:root {
    --primary:       #d97706;
    --primary-light: #fef3c7;
    --primary-dark:  #92400e;
    --accent:        #059669;
    --accent-light:  #d1fae5;
    --warning:       #b91c1c;
    --warning-light: #fee2e2;
    --danger:        #7c2d12;
    --danger-light:  #fef2f2;
    --purple:        #7c3aed;
    --purple-light:  #ede9fe;
    --teal:          #0f766e;
    --teal-light:    #ccfbf1;
    --cyan:          #0891b2;
    --cyan-light:    #e0f2fe;
    --blue:          #1d4ed8;
    --blue-light:    #dbeafe;
    --gray-50:  #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius:    12px;
    --shadow:    0 1px 3px rgba(0,0,0,0.1),0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07),0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1),0 4px 6px rgba(0,0,0,0.05);
}

body {
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;
    line-height: 1.8;
    color: var(--gray-800);
    background: var(--gray-50);
}

/* ===================================================
   顶部导航
   =================================================== */
.top-nav {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}
.top-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 44px;
}
.top-nav .logo {
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}
.top-nav .logo:hover { opacity:.9; }
.top-nav .nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    flex-wrap: wrap;
    align-items: center;
}
.top-nav .nav-links a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    transition: all 0.2s;
    white-space: nowrap;
}
.top-nav .nav-links a:hover,
.top-nav .nav-links a.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

/* 下拉菜单 */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { cursor: pointer; display: flex; align-items: center; gap: 4px; }
.nav-arrow { font-size: 0.7rem; transition: transform 0.2s; }
.nav-dropdown.open .nav-arrow { transform: rotate(180deg); }
.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    min-width: 220px;
    display: none;
    z-index: 200;
    overflow: hidden;
}
.nav-dropdown.open .nav-dropdown-menu { display: block; }
.nav-dropdown-menu.chapters-menu { min-width: 480px; display: none; }
.nav-dropdown.open .nav-dropdown-menu.chapters-menu { display: flex; gap: 0; flex-wrap: wrap; }
.dropdown-group {
    padding: 10px 0;
    min-width: 155px;
    flex: 1;
    border-right: 1px solid var(--gray-100);
}
.dropdown-group:last-child { border-right: none; }
.dropdown-label {
    padding: 4px 14px;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}
.nav-dropdown-menu a {
    display: block;
    padding: 7px 14px;
    color: var(--gray-700) !important;
    font-size: 0.85rem;
    text-decoration: none;
    transition: all 0.15s;
    background: none !important;
}
.nav-dropdown-menu a:hover { background: var(--primary-light) !important; color: var(--primary-dark) !important; }
.nav-dropdown-menu a.active { background: var(--primary-light) !important; color: var(--primary) !important; font-weight: 600; }

/* 汉堡按钮 */
.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: white;
    border-radius: 2px;
    transition: all 0.3s;
}

/* 侧边栏（移动端） */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 150;
}
.nav-overlay.show { display: block; }
.nav-sidebar {
    position: fixed;
    top: 0;
    right: -320px;
    width: 300px;
    height: 100vh;
    background: linear-gradient(160deg, var(--primary-dark), #1c0a00);
    z-index: 160;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.nav-sidebar.open { right: 0; }
.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    color: white;
    font-weight: 700;
    font-size: 1rem;
}
.sidebar-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}
.sidebar-close:hover { background: rgba(255,255,255,0.1); }
.sidebar-body {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}
.sidebar-link {
    display: block;
    padding: 9px 1.5rem;
    color: rgba(255,255,255,0.8) !important;
    text-decoration: none;
    font-size: 0.88rem;
    transition: all 0.15s;
}
.sidebar-link:hover { background: rgba(255,255,255,0.1); color: white !important; }
.sidebar-link.active { background: rgba(255,255,255,0.15); color: white !important; font-weight: 600; }
.sidebar-section {
    padding: 8px 1.5rem 4px;
    font-size: 0.72rem;
    font-weight: 700;
    color: rgba(255,255,255,0.4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 6px;
}

/* FAB 首页按钮 */
.fab-home {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: all 0.2s;
    z-index: 90;
}
.fab-home:hover { background: var(--primary-dark); transform: scale(1.1); }

/* ===================================================
   面包屑
   =================================================== */
.breadcrumb {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem 0;
    font-size: 0.85rem;
    color: var(--gray-500);
}
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; }

/* ===================================================
   页面 Hero
   =================================================== */
.page-hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 2rem 1rem;
}
.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}
.page-hero .subtitle {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 700px;
}
.chapter-badge {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 12px;
}

/* ===================================================
   主内容布局
   =================================================== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem 3rem;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 2rem;
    align-items: start;
}
.main-content.full-width { grid-template-columns: 1fr; }
.content-body { min-width: 0; }
.content-body h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary);
    display: inline-block;
    scroll-margin-top: 72px;
}
.content-body h2:first-child { margin-top: 0; }
.content-body h3 { font-size: 1.2rem; font-weight: 600; color: var(--gray-800); margin: 1.8rem 0 0.8rem; }
.content-body h4 { font-size: 1.05rem; font-weight: 600; color: var(--gray-700); margin: 1.2rem 0 0.5rem; }
.content-body p { margin-bottom: 1rem; color: var(--gray-700); }
.content-body ul,
.content-body ol { margin: 0.5rem 0 1rem 1.5rem; color: var(--gray-700); }
.content-body li { margin-bottom: 0.4rem; }
.content-body strong { color: var(--gray-900); }

/* ===================================================
   右侧目录栏
   =================================================== */
.sidebar { position: sticky; top: 72px; }
.sidebar-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.sidebar-card h3 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.sidebar-card .toc-list { list-style: none; padding: 0; }
.sidebar-card .toc-list li { margin-bottom: 2px; }
.sidebar-card .toc-list a {
    display: block;
    padding: 6px 10px;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.85rem;
    border-radius: 6px;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}
.sidebar-card .toc-list a:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-left-color: var(--primary);
}

/* ===================================================
   章节导入框
   =================================================== */
.chapter-intro {
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    border: 2px solid #fcd34d;
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}
.ci-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.ci-badge {
    background: var(--primary);
    color: white;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}
.ci-phase {
    background: white;
    color: var(--primary-dark);
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    border: 1px solid #fcd34d;
}
.chapter-intro h3 {
    margin: 0 0 10px;
    font-size: 1rem;
    color: var(--primary-dark);
}
.intro-hooks {
    list-style: none;
    padding: 0;
    margin: 0;
}
.intro-hooks li {
    padding: 6px 0 6px 24px;
    position: relative;
    color: var(--gray-700);
    font-size: 0.95rem;
    border-bottom: 1px dashed #fcd34d;
}
.intro-hooks li:last-child { border-bottom: none; }
.intro-hooks li::before { content: "❓"; position: absolute; left: 0; }

/* ===================================================
   知识卡片（info-box 系列）
   =================================================== */
.info-box {
    border-radius: var(--radius);
    padding: 1.2rem 1.5rem;
    margin: 1.5rem 0;
}
.info-box.blue   { background: var(--cyan-light);    border-left: 4px solid var(--cyan); }
.info-box.green  { background: var(--accent-light);  border-left: 4px solid var(--accent); }
.info-box.yellow { background: var(--primary-light); border-left: 4px solid var(--primary); }
.info-box.red    { background: var(--warning-light); border-left: 4px solid var(--warning); }
.info-box.purple { background: var(--purple-light);  border-left: 4px solid var(--purple); }
.info-box.teal   { background: var(--teal-light);    border-left: 4px solid var(--teal); }
.info-box .box-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 6px;
    color: var(--gray-800);
}
.info-box p { margin-bottom: 0.5rem; color: var(--gray-700); }
.info-box p:last-child { margin-bottom: 0; }
.info-box ul { margin: 0.3rem 0 0 1.2rem; color: var(--gray-700); }
.info-box li { margin-bottom: 0.3rem; }

/* ===================================================
   关键概念框
   =================================================== */
.key-concept {
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 1.2rem 1.5rem;
    margin: 1.5rem 0;
    color: var(--gray-800);
}
.key-concept::before {
    content: "🔑 核心概念";
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--primary-dark);
    display: block;
    margin-bottom: 6px;
}

/* ===================================================
   生活案例框
   =================================================== */
.life-example {
    background: linear-gradient(135deg, #fff7ed, #fed7aa);
    border-radius: var(--radius);
    padding: 1.2rem 1.5rem;
    margin: 1.2rem 0;
    color: var(--gray-800);
}
.life-example::before {
    content: "💡 生活场景";
    font-weight: 700;
    font-size: 0.85rem;
    color: #c2410c;
    display: block;
    margin-bottom: 6px;
}

/* ===================================================
   临床关联框
   =================================================== */
.clinical-link {
    background: linear-gradient(135deg, #fff1f2, #ffe4e6);
    border: 1px solid #fecdd3;
    border-left: 4px solid var(--warning);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 1.2rem 1.5rem;
    margin: 1.2rem 0;
    color: var(--gray-800);
}
.clinical-link::before {
    content: "🏥 临床关联";
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--warning);
    display: block;
    margin-bottom: 6px;
}

/* ===================================================
   误区提示
   =================================================== */
.misconception {
    background: #fef9c3;
    border: 1px solid #fde047;
    border-left: 4px solid #ca8a04;
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 1.2rem 1.5rem;
    margin: 1.2rem 0;
}
.misconception .myth {
    color: var(--warning);
    font-weight: 700;
    text-decoration: line-through;
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}
.misconception .truth {
    color: var(--accent);
    font-weight: 700;
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}
.misconception p { margin: 0.3rem 0 0; color: var(--gray-700); font-size: 0.92rem; }

/* ===================================================
   对比表格
   =================================================== */
.compare-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    font-size: 0.9rem;
}
.compare-table th {
    background: var(--primary);
    color: white;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
}
.compare-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-700);
    vertical-align: top;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: var(--gray-50); }

/* ===================================================
   统计网格
   =================================================== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(160px,1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.stat-item {
    background: white;
    border-radius: var(--radius);
    padding: 1.2rem;
    text-align: center;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--primary);
}
.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    display: block;
}
.stat-label {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 4px;
}

/* ===================================================
   流程步骤
   =================================================== */
.flow-steps {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin: 1.5rem 0;
}
.flow-step {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 8px 16px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.88rem;
    white-space: nowrap;
    border: 1px solid #fcd34d;
}
.flow-arrow { color: var(--primary); font-size: 1.2rem; font-weight: 700; }

/* 竖排流程（用于复杂进展链） */
.flow-chain {
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.flow-node {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: white;
    border: 1px solid var(--gray-200);
    border-bottom: none;
    font-size: 0.9rem;
    color: var(--gray-700);
}
.flow-node:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.flow-node:last-child { border-bottom: 1px solid var(--gray-200); border-radius: 0 0 var(--radius) var(--radius); }
.flow-node-num {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
}
.flow-node-body strong { color: var(--gray-900); }
.flow-node-body small { color: var(--gray-500); display: block; margin-top: 2px; }
.flow-node.fn-alert { background: #fff7ed; border-color: #fed7aa; }
.flow-node.fn-danger { background: #fff1f2; border-color: #fecdd3; }

/* ===================================================
   四要素卡片（四问模型）
   =================================================== */
.four-questions {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.fq-item {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.2rem;
    border-top: 3px solid var(--primary);
}
.fq-item.fq-what  { border-top-color: var(--primary); }
.fq-item.fq-why   { border-top-color: var(--cyan); }
.fq-item.fq-matter{ border-top-color: var(--warning); }
.fq-item.fq-action{ border-top-color: var(--accent); }
.fq-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.fq-num {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.fq-item.fq-why .fq-num   { background: var(--cyan); }
.fq-item.fq-matter .fq-num { background: var(--warning); }
.fq-item.fq-action .fq-num { background: var(--accent); }
.fq-label { font-weight: 700; font-size: 0.95rem; color: var(--gray-900); }
.fq-content { font-size: 0.9rem; color: var(--gray-700); line-height: 1.7; margin: 0; }

/* ===================================================
   对比双栏框
   =================================================== */
.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
}
.cb-normal, .cb-path {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.2rem;
}
.cb-normal { border-top: 3px solid var(--accent); }
.cb-path   { border-top: 3px solid var(--warning); }
.cb-label {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--gray-800);
}
.cb-content ul { margin: 0 0 0 1.2rem; }
.cb-content li { font-size: 0.88rem; color: var(--gray-700); margin-bottom: 4px; }

/* ===================================================
   行动清单
   =================================================== */
.action-list {
    background: var(--accent-light);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 1px solid #6ee7b7;
}
.action-list h3 { color: #065f46; margin: 0 0 12px; font-size: 1rem; }
.action-list ul { margin: 0 0 0 1.2rem; }
.action-list li { color: #064e3b; font-size: 0.92rem; margin-bottom: 6px; }
.action-list li strong { color: #022c22; }

/* ===================================================
   警告清单（紧急就医）
   =================================================== */
.warning-list {
    background: var(--warning-light);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 1px solid #fca5a5;
}
.warning-list h3 { color: #7c2d12; margin: 0 0 12px; font-size: 1rem; }
.warning-list ul { margin: 0 0 0 1.2rem; }
.warning-list li { color: #991b1b; font-size: 0.92rem; margin-bottom: 6px; }

/* ===================================================
   数值范围卡片
   =================================================== */
.range-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(160px,1fr));
    gap: 10px;
    margin: 1.5rem 0;
}
.range-card {
    background: white;
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
}
.range-card.rc-normal  { border-top: 3px solid var(--accent); }
.range-card.rc-warn    { border-top: 3px solid var(--primary); }
.range-card.rc-danger  { border-top: 3px solid var(--warning); }
.range-val { font-size: 1.2rem; font-weight: 800; display: block; margin-bottom: 4px; }
.rc-normal  .range-val { color: var(--accent); }
.rc-warn    .range-val { color: var(--primary-dark); }
.rc-danger  .range-val { color: var(--warning); }
.range-label { font-size: 0.8rem; color: var(--gray-500); }
.range-note  { font-size: 0.78rem; color: var(--gray-400); margin-top: 4px; }

/* ===================================================
   章节底部导航
   =================================================== */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--gray-200);
    gap: 1rem;
}
.chapter-nav a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--primary-dark);
    font-weight: 600;
    padding: 12px 20px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.2s;
    max-width: 48%;
}
.chapter-nav a:hover { box-shadow: var(--shadow-md); background: var(--primary-light); }
.chapter-nav a.next { margin-left: auto; }
.chapter-nav .nav-label { font-size: 0.75rem; color: var(--gray-500); font-weight: 400; display: block; }

/* ===================================================
   首页 Hero
   =================================================== */
.index-hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #f59e0b 100%);
    color: white;
    padding: 3rem 2rem 2.5rem;
    text-align: center;
    min-height: calc(100vh - 44px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.index-hero-inner { max-width: 820px; margin: 0 auto; text-align: center; width: 100%; }
.index-hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 6px 18px;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(4px);
}
.index-hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}
.index-hero-sub {
    font-size: 1.15rem;
    opacity: 0.9;
    max-width: 640px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}
.index-hero-stats {
    display: flex;
    justify-content: center;
    gap: 0;
    background: rgba(255,255,255,0.12);
    border-radius: var(--radius);
    padding: 1rem;
    margin: 2rem auto;
    max-width: 560px;
    backdrop-filter: blur(6px);
    flex-wrap: wrap;
}
.ihs-item { text-align: center; padding: 0.5rem 1.5rem; flex: 1; min-width: 90px; }
.ihs-num { font-size: 2rem; font-weight: 800; display: block; }
.ihs-label { font-size: 0.8rem; opacity: 0.8; }
.ihs-divider { width: 1px; background: rgba(255,255,255,0.3); margin: 0.5rem 0; }
.index-hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-btn-primary {
    background: white;
    color: var(--primary-dark);
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 700;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}
.hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }
.hero-btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.7);
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.2s;
}
.hero-btn-outline:hover { background: rgba(255,255,255,0.15); border-color: white; }
.index-hero-icons { margin-top: 2rem; font-size: 2rem; display: flex; justify-content: center; gap: 1rem; opacity: 0.6; flex-wrap: wrap; }

/* ===================================================
   首页内容区
   =================================================== */
.home-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem 1rem;
}
.home-section-header { margin-bottom: 1.5rem; }
.home-section-header h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.3rem;
}
.section-sub { color: var(--gray-500); font-size: 0.95rem; }
.phase-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 16px;
    border-radius: 6px;
    margin-bottom: 1rem;
    display: inline-block;
}
.phase-amber  { background: var(--primary-light); color: var(--primary-dark); }
.phase-green  { background: var(--accent-light);  color: #065f46; }
.phase-purple { background: var(--purple-light);  color: #4c1d95; }

/* 章节卡片（首页） */
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(300px,1fr));
    gap: 1.5rem;
    margin: 1rem 0 2rem;
}
.chapter-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
    border-left: 4px solid var(--primary);
    display: block;
}
.chapter-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.chapter-card .ch-num {
    display: inline-block;
    background: var(--primary);
    color: white;
    width: 34px; height: 34px;
    border-radius: 50%;
    text-align: center; line-height: 34px;
    font-size: 0.85rem; font-weight: 700;
    margin-bottom: 10px;
}
.chapter-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.chapter-card p { font-size: 0.88rem; color: var(--gray-500); margin: 0; line-height: 1.5; }
.chapter-card .tag {
    display: inline-block;
    background: var(--gray-100);
    color: var(--gray-600);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-top: 8px;
}
.chapter-card.phase-1 { border-left-color: var(--primary); }
.chapter-card.phase-1 .ch-num { background: var(--primary); }
.chapter-card.phase-2 { border-left-color: var(--teal); }
.chapter-card.phase-2 .ch-num { background: var(--teal); }
.chapter-card.phase-3 { border-left-color: var(--purple); }
.chapter-card.phase-3 .ch-num { background: var(--purple); }

/* 工具页卡片 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
    gap: 1.2rem;
    margin: 1rem 0 2rem;
}
.tool-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    border-top: 3px solid var(--primary);
}
.tool-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.tool-card.tool-amber { border-top-color: var(--primary); }
.tool-card.tool-green { border-top-color: var(--accent); }
.tool-card.tool-blue  { border-top-color: var(--cyan); }
.tool-icon { font-size: 2rem; flex-shrink: 0; }
.tool-name { font-weight: 700; font-size: 1rem; color: var(--gray-900); margin-bottom: 4px; }
.tool-desc { font-size: 0.85rem; color: var(--gray-500); line-height: 1.5; }

/* 使用逻辑 4步格 */
.path-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
    gap: 1rem;
    margin: 1rem 0 2rem;
}
.path-step {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--gray-200);
    transition: all 0.2s;
}
.path-step:hover { border-top-color: var(--primary); }
.path-step-icon { font-size: 2rem; margin-bottom: 10px; }
.path-step-name { font-weight: 700; font-size: 1rem; color: var(--gray-900); margin-bottom: 4px; }
.path-step-sub  { font-size: 0.82rem; color: var(--primary-dark); font-weight: 600; margin-bottom: 8px; }
.path-step-desc { font-size: 0.85rem; color: var(--gray-500); line-height: 1.5; }

/* Tip卡片 */
.tip-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(240px,1fr));
    gap: 1rem;
    margin: 1rem 0 2rem;
}
.tip-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
}
.tip-card.tc-amber  { border-left-color: var(--primary); }
.tip-card.tc-green  { border-left-color: var(--accent); }
.tip-card.tc-blue   { border-left-color: var(--cyan); }
.tip-card.tc-purple { border-left-color: var(--purple); }
.tip-card-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 8px; color: var(--gray-900); }
.tip-card-body  { font-size: 0.88rem; color: var(--gray-600); line-height: 1.6; }

/* ===================================================
   工具页专用（指标速查/药物）
   =================================================== */
.lookup-search {
    display: flex;
    gap: 10px;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}
.lookup-search input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}
.lookup-search input:focus { border-color: var(--primary); }
.filter-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 1.5rem; }
.filter-btn {
    padding: 6px 14px;
    border: 2px solid var(--gray-200);
    background: white;
    border-radius: 25px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary-dark); }
.filter-btn.active { background: var(--primary); border-color: var(--primary); color: white; font-weight: 600; }

.indicator-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.indicator-table th {
    background: var(--primary);
    color: white;
    padding: 12px 14px;
    text-align: left;
    font-size: 0.85rem;
    font-weight: 600;
}
.indicator-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 0.88rem;
    color: var(--gray-700);
    vertical-align: top;
}
.indicator-table tr:last-child td { border-bottom: none; }
.indicator-table tr:hover td { background: #fffbeb; }
.cat-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
}
.cat-glucose { background: #fef3c7; color: #92400e; }
.cat-thyroid { background: #ede9fe; color: #5b21b6; }
.cat-uric    { background: #dbeafe; color: #1e40af; }
.cat-lipid   { background: #d1fae5; color: #065f46; }
.cat-bone    { background: #fce7f3; color: #9d174d; }
.cat-liver   { background: #fff7ed; color: #c2410c; }
.cat-body    { background: #f0fdf4; color: #166534; }
.normal-val  { color: var(--accent); font-weight: 600; }
.warn-val    { color: var(--primary-dark); font-weight: 600; }
.danger-val  { color: var(--warning); font-weight: 600; }

/* ===================================================
   页脚
   =================================================== */
.site-footer {
    background: var(--gray-800);
    color: var(--gray-300);
    text-align: center;
    padding: 2rem;
    font-size: 0.85rem;
    margin-top: 2rem;
}

/* ===================================================
   响应式
   =================================================== */
@media (max-width: 900px) {
    .main-content { grid-template-columns: 1fr; padding: 1rem 1.2rem 3rem; }
    .sidebar { position: static; }
    .top-nav .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .index-hero-title { font-size: 2rem; }
    .comparison-box { grid-template-columns: 1fr; }
    .four-questions { grid-template-columns: 1fr; }
    .nav-dropdown-menu.chapters-menu { min-width: 280px; flex-direction: column; }
    .dropdown-group { min-width: unset; border-right: none; border-bottom: 1px solid var(--gray-100); }
}
@media (max-width: 600px) {
    .page-hero { padding: 1.2rem 1rem 0.5rem; }
    .page-hero h1 { font-size: 1.6rem; }
    .breadcrumb { padding: 0.8rem 1rem 0; }
    .home-section { padding: 2rem 1rem 0.5rem; }
    .ihs-divider { display: none; }
    .ihs-item { min-width: 0; padding: 0.3rem 0.6rem; }
    .hero-btn-primary, .hero-btn-outline { padding: 10px 16px; font-size: .9rem; }
    .index-hero-cta { gap: 10px; }
}

/* ===== 紧凑布局修正 ===== */
.main-content { padding: 0 2rem 3rem; }
.home-section { margin: 0.4rem 0; }
.home-section-header { margin-bottom: 0.5rem; padding-bottom: 6px; }
.home-section-header h2 { margin: 0; }
.phase-label { padding: 3px 12px; margin: 0.6rem 0 0.4rem; }
.chapter-grid { gap: 0.6rem; margin: 0.4rem 0; }
.chapter-card { padding: 1rem 1.2rem; display: flex; align-items: center; gap: .9rem; }
.chapter-card .ch-num { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; font-size: 0.82rem; }
.chapter-card .ch-body { min-width: 0; }
.chapter-card h3 { font-size: 1rem; margin: 0 0 3px; }
.chapter-card p { font-size: 0.85rem; margin: 0; line-height: 1.4; }