/* ============================================
   个人数字资产空间 — 样式表
   纯 CSS · 零依赖 · 响应式 · 亮色/暗色双主题
   ============================================ */

/* ---------- CSS 变量 / 主题 ---------- */
:root {
    /* 亮色主题（默认） */
    --bg: #f8f7f4;
    --bg-alt: #f1efe9;
    --bg-card: #ffffff;
    --bg-nav: rgba(248, 247, 244, 0.85);
    --text: #1a1a1a;
    --text-secondary: #555;
    --text-muted: #888;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.14);
    --accent: #c2410c;
    --accent-soft: rgba(194, 65, 12, 0.08);
    --accent-glow: rgba(194, 65, 12, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --font-serif: 'Songti SC', 'Noto Serif SC', 'STSong', 'SimSun', Georgia, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, 'Courier New', monospace;
}

[data-theme="dark"] {
    --bg: #0d0d0f;
    --bg-alt: #131316;
    --bg-card: #1a1a1e;
    --bg-nav: rgba(13, 13, 15, 0.85);
    --text: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-muted: #666;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);
    --accent: #f97316;
    --accent-soft: rgba(249, 115, 22, 0.10);
    --accent-glow: rgba(249, 115, 22, 0.20);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ---------- 重置 ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition-slow), color var(--transition-slow);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- 通用容器 ---------- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text);
    transition: color var(--transition);
}

.nav-logo:hover { color: var(--accent); }

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
    transition: width var(--transition);
}

.nav-link:hover {
    color: var(--text);
}

.nav-link:hover::after {
    width: 20px;
}

.nav-link.active {
    color: var(--accent);
}

.nav-link.active::after {
    width: 20px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 语言切换按钮 */
.lang-toggle {
    width: 44px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    letter-spacing: 0.02em;
}

.lang-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

/* 导航栏顶端分享按钮 */
.nav-share {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-share:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.hamburger span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
    margin: 0 auto;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero 首屏 ---------- */
.hero {
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 80px 24px 40px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.hero-glow-1 {
    width: 500px;
    height: 500px;
    background: var(--accent);
    top: -100px;
    right: -100px;
}

.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: #6366f1;
    bottom: -50px;
    left: -50px;
    animation-delay: -4s;
    opacity: 0.15;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-avatar {
    width: 100px;
    height: 100px;
    margin: 0 auto 32px;
    position: relative;
}

.avatar-ring {
    position: absolute;
    inset: -4px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    opacity: 0.3;
    animation: pulse-ring 3s ease-in-out infinite;
}

@keyframes pulse-ring {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

.avatar-inner {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-text {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.02em;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 24px;
    letter-spacing: 0.08em;
}

.hero-badges {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 48px;
    margin-bottom: 36px;
}

.badge {
    padding: 6px 16px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 100px;
    letter-spacing: 0.05em;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 32px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
    color: var(--text);
    border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 通用 Section ---------- */
.section {
    padding: 100px 0;
    position: relative;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 56px;
}

.section-num {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 0.1em;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 700;
    letter-spacing: 0.03em;
}

.section-header::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
    margin-left: 8px;
}

/* ---------- 关于 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-text p:first-child {
    font-size: 1.15rem;
    color: var(--text);
    font-weight: 400;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: all var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.stat-num {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ---------- 筛选标签 ---------- */
.filter-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.filter-tag {
    padding: 8px 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    transition: all var(--transition);
}

.filter-tag:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.filter-tag.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ---------- 文档卡片 ---------- */
.doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.doc-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    opacity: 1;
    transform: scale(1);
}

.doc-card.hidden {
    display: none;
}

.doc-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.doc-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.doc-type {
    padding: 4px 12px;
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.05em;
}

.doc-type-research { background: rgba(99, 102, 241, 0.1); color: #6366f1; }
.doc-type-essay { background: var(--accent-soft); color: var(--accent); }
.doc-type-note { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.doc-type-translation { background: rgba(168, 85, 247, 0.1); color: #a855f7; }

[data-theme="dark"] .doc-type-research { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
[data-theme="dark"] .doc-type-essay { background: rgba(249, 115, 22, 0.15); color: #fb923c; }
[data-theme="dark"] .doc-type-note { background: rgba(16, 185, 129, 0.15); color: #34d399; }
[data-theme="dark"] .doc-type-translation { background: rgba(168, 85, 247, 0.15); color: #c084fc; }

.doc-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.doc-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 12px;
    color: var(--text);
}

.doc-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    flex: 1;
}

.doc-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.doc-tags span {
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-alt);
    padding: 3px 10px;
    border-radius: 4px;
}

.doc-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    transition: gap var(--transition);
}

.doc-link:hover {
    letter-spacing: 0.02em;
}

/* ---------- 专题卡片 ---------- */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.topic-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.topic-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: var(--radius-md);
    color: var(--accent);
    margin-bottom: 4px;
}

.topic-title {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
}

.topic-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
}

.topic-count {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 0.03em;
}

/* ---------- 联系 ---------- */
.contact-wrap {
    max-width: 760px;
    margin: 0 auto;
}

.contact-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
    color: var(--accent);
}

.contact-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 2px;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    font-family: var(--font-mono);
}

/* ---------- 页脚 ---------- */
.footer {
    border-top: 1px solid var(--border);
    padding: 48px 0;
    background: var(--bg);
}

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

.footer-logo {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
}

.footer-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.footer-copy,
.footer-built {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: right;
}

.footer-built {
    margin-top: 4px;
    font-family: var(--font-mono);
}

/* ICP 备案号（工信部链接） */
.footer-icp {
    margin-top: 8px;
    font-size: 0.75rem;
    text-align: right;
}

.footer-icp a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-icp a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ---------- 动画入场 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-nav);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 16px 24px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-200%);
        transition: transform var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-link {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .nav-link:hover {
        background: var(--accent-soft);
    }

    .nav-link::after { display: none; }

    .hamburger { display: flex; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .section { padding: 64px 0; }

    .section-header { margin-bottom: 40px; }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }

    .btn {
        text-align: center;
    }

    .doc-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-copy, .footer-built {
        text-align: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-badges { gap: 8px; }
    .badge { font-size: 0.72rem; padding: 5px 12px; }
    .stat-card { padding: 16px; }
    .stat-num { font-size: 1.5rem; }
    .filter-tag { padding: 6px 14px; font-size: 0.8rem; }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}

/* ============================================
   第三阶段新增样式
   a 链接卡片适配 · noscript 兜底 · CC 许可
   ============================================ */

/* 文档卡片改为 <a> 元素后的样式适配 */
a.featured-card,
a.doc-list-item,
a.doc-card.recommend-item {
    text-decoration: none;
    color: inherit;
}

a.featured-card:focus-visible,
a.doc-list-item:focus-visible,
a.doc-card.recommend-item:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* 页脚 CC 许可 */
.footer-cc {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

.footer-cc a {
    color: var(--accent);
    font-weight: 500;
}

.footer-cc a:hover {
    text-decoration: underline;
}

/* noscript 静态兜底样式（JS 禁用/不执行 JS 的爬虫可见） */
.noscript-fallback {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 24px;
    background: var(--bg-card);
}

.noscript-fallback h2 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text);
}

.noscript-fallback .ns-block {
    margin-bottom: 20px;
}

.noscript-fallback .ns-block h3 {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 8px;
}

.noscript-fallback .ns-block ul {
    list-style: none;
    padding: 0;
}

.noscript-fallback .ns-block li {
    padding: 4px 0;
    border-bottom: 1px solid var(--border);
}

.noscript-fallback .ns-block li:last-child {
    border-bottom: none;
}

.noscript-fallback .ns-block a {
    color: var(--text);
    font-size: 0.88rem;
    transition: color var(--transition);
}

.noscript-fallback .ns-block a:hover {
    color: var(--accent);
}

.noscript-fallback .ns-block small {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.7rem;
}

@media (max-width: 768px) {
    .footer-cc {
        text-align: center;
    }
}

/* ============================================
   第二阶段新增样式
   搜索 · 关键词推荐 · 分类区块 · 置顶概要 · 推荐区
   ============================================ */

/* ---------- 搜索区 ---------- */
.search-wrap {
    position: relative;
    max-width: 560px;
    margin: 32px auto 0;
    text-align: left;
    z-index: 50;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    padding: 6px 8px 6px 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-md);
}

.search-icon {
    color: var(--text-muted);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text);
    padding: 8px 0;
    min-width: 0;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-clear {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    line-height: 1;
    color: var(--text-muted);
    background: var(--bg-alt);
    border-radius: 50%;
    transition: all var(--transition);
}

.search-clear:hover {
    color: var(--text);
    background: var(--border);
}

.search-clear.show {
    display: flex;
}

/* 关键词推荐 chips */
.keyword-suggest {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.keyword-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.keyword-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.keyword-chip {
    padding: 4px 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    cursor: pointer;
    transition: all var(--transition);
}

.keyword-chip:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* 搜索结果下拉 */
.search-results {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 380px;
    overflow-y: auto;
    z-index: 9999;        /* 提升到最高层级，不被 cat-block 覆盖 */
    animation: fadeInDown 0.25s ease-out;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.search-result-item {
    display: block;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover,
.search-result-item.highlight {
    background: var(--accent-soft);
}

.search-result-top {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.search-result-cat {
    padding: 2px 8px;
    font-size: 0.68rem;
    font-weight: 600;
    border-radius: 100px;
    flex-shrink: 0;
}

.search-result-title {
    font-family: var(--font-serif);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-title mark {
    background: transparent;
    color: var(--accent);
    font-weight: 700;
}

.search-result-excerpt {
    font-size: 0.78rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-excerpt mark {
    background: transparent;
    color: var(--accent);
}

.search-results-empty {
    padding: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.search-results-hint {
    padding: 10px 20px;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    letter-spacing: 0.05em;
}

/* ---------- 分类区块 ---------- */
.cat-block {
    margin-bottom: 72px;
    scroll-margin-top: 80px;
}

.cat-block:last-child {
    margin-bottom: 0;
}

.cat-block-header {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.cat-block-name {
    font-family: var(--font-serif);
    font-size: clamp(1.3rem, 3vw, 1.7rem);
    font-weight: 700;
    letter-spacing: 0.03em;
}

.cat-block-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    align-self: center;
}

.cat-block-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    flex-basis: 100%;
    margin-left: 26px;
    line-height: 1.6;
}

.cat-block-count {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-left: auto;
    white-space: nowrap;
}

/* 分类内分隔线 */
.cat-block-divider {
    height: 1px;
    background: var(--border);
    margin: 16px 0 24px 26px;
    position: relative;
}

.cat-block-divider::after {
    content: '';
    position: absolute;
    left: 0;
    top: -2px;
    width: 60px;
    height: 5px;
    border-radius: 3px;
    background: var(--cat-color, var(--accent));
    opacity: 0.6;
}

/* 空分类提示 */
.cat-block-empty {
    margin: 4px 0 24px 26px;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* 置顶内容概要（大卡片） */
.featured-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.featured-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.featured-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--cat-color, var(--accent));
    opacity: 0.8;
}

.featured-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--cat-color, var(--accent));
}

.featured-pin {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--cat-color, var(--accent));
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}

.featured-pin svg {
    flex-shrink: 0;
}

.featured-title {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 10px;
    color: var(--text);
}

.featured-excerpt {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.featured-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.featured-meta .readtime {
    font-family: var(--font-mono);
}

.featured-arrow {
    margin-left: auto;
    color: var(--cat-color, var(--accent));
    font-size: 1.1rem;
    transition: transform var(--transition);
}

.featured-card:hover .featured-arrow {
    transform: translateX(4px);
}

/* 分类内其他文档（紧凑行） */
.doc-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-card);
}

.doc-list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.doc-list-item:last-child {
    border-bottom: none;
}

.doc-list-item:hover {
    background: var(--accent-soft);
}

.doc-list-title {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.doc-list-tags {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.doc-list-tags span {
    font-size: 0.68rem;
    color: var(--text-muted);
    background: var(--bg-alt);
    padding: 2px 8px;
    border-radius: 4px;
}

.doc-list-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.doc-list-date {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
}

.doc-list-arrow {
    color: var(--text-muted);
    font-size: 1rem;
    transition: all var(--transition);
}

.doc-list-item:hover .doc-list-arrow {
    color: var(--accent);
    transform: translateX(3px);
}

/* ---------- 推荐区 ---------- */
.section-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: -32px;
    margin-bottom: 32px;
}

.doc-card.recommend-item {
    cursor: pointer;
    position: relative;
}

.doc-card.recommend-item::after {
    content: '推荐';
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 3px 10px;
    border-radius: 100px;
    letter-spacing: 0.08em;
}

/* 推荐原因 */
.recommend-reason {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.recommend-reason svg {
    flex-shrink: 0;
}

/* ---------- 文档提示 toast ---------- */
.doc-toast {
    position: fixed;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--bg);
    font-size: 0.85rem;
    padding: 12px 24px;
    border-radius: 100px;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    animation: toastIn 0.3s ease-out;
    max-width: 90vw;
    text-align: center;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(12px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ---------- 响应式补充 ---------- */
@media (max-width: 768px) {
    .featured-grid {
        grid-template-columns: 1fr;
    }

    .cat-block-count {
        margin-left: 0;
        flex-basis: 100%;
    }

    .doc-list-item {
        flex-wrap: wrap;
        gap: 8px;
    }

    .doc-list-title {
        flex-basis: 100%;
    }

    .search-wrap {
        max-width: 100%;
    }

    .search-results {
        max-height: 300px;
    }
}

@media (max-width: 480px) {
    .keyword-label {
        display: none;
    }

    .featured-card {
        padding: 22px;
    }
}

/* ============================================
   分享功能样式
   浮动按钮 + 分类分享图标 + 分享面板
   ============================================ */

/* 浮动分享按钮（首页右下角，在回到顶部按钮上方） */
.share-fab {
    position: fixed;
    bottom: 88px;
    right: 32px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 16px;
    height: 44px;
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    box-shadow: var(--shadow-md);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}

.share-fab.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.share-fab:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.share-fab-label {
    font-family: inherit;
}

/* 分类标题旁的小分享图标 */
.cat-share {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-muted);
    transition: all var(--transition);
    margin-left: auto;
    flex-shrink: 0;
}

.cat-share:hover {
    color: var(--accent);
    background: var(--accent-soft);
}

/* 分类"查看全部"链接 */
.cat-more {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 4px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    transition: all var(--transition);
    flex-shrink: 0;
    margin-left: 10px;
}

.cat-more:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* 最新文章区标题旁的"全部文章"按钮（靠右，与分类区块呼应） */
.latest-more {
    margin-left: auto;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 4px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    transition: all var(--transition);
    flex-shrink: 0;
}

.latest-more:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* 文档页标题下方的分享按钮 */
.doc-share {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 6px 14px;
    font-size: 0.85rem;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 100px;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.doc-share:hover {
    background: var(--accent);
    color: #fff;
}

/* 分享面板（弹层） */
.share-panel {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}

.share-panel.show {
    opacity: 1;
    pointer-events: auto;
}

.share-panel-inner {
    max-width: 480px;
    width: 100%;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: shareIn 0.25s ease-out;
}

@keyframes shareIn {
    from { opacity: 0; transform: translateY(16px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.share-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.share-panel-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
}

.share-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition);
}

.share-close:hover {
    background: var(--bg-alt);
    color: var(--text);
}

.share-panel-body {
    padding: 20px;
}

/* 二维码卡片 */
.share-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    margin-bottom: 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.qr-canvas {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border-radius: 8px;
    padding: 8px;
    box-shadow: var(--shadow-sm);
}

.qr-canvas canvas {
    display: block;
}

.qr-hint {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 500;
}

.qr-fallback {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* 分享操作项 */
.share-qr-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 8px;
}

.share-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 8px;
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
    font-size: 0.8rem;
    font-family: inherit;
}

.share-item:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.share-item svg {
    color: inherit;
    flex-shrink: 0;
}

.share-item.copied {
    background: #10b981;
    border-color: #10b981;
    color: #fff;
}

.share-wechat-hint {
    grid-column: 1 / -1;
    margin-top: 4px;
    padding: 12px 16px;
    font-size: 0.78rem;
    color: var(--text-muted);
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    text-align: center;
}

@media (max-width: 768px) {
    .share-fab {
        right: 20px;
        bottom: 76px;
        padding: 0 14px;
        height: 40px;
    }

    .share-fab-label {
        display: none;
    }

    .share-qr-actions {
        grid-template-columns: repeat(3, 1fr);
    }

    .share-item {
        padding: 12px 6px;
        font-size: 0.72rem;
    }
}