:root {
    --primary: #ea580c;
    --accent: #d97706;
    --bg: #fffbf5;
    --text: #1c1917;
    --border: #1c1917;
    --font-mono: 'SF Mono', 'Fira Code', 'Courier New', monospace;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.8;
    font-weight: 400;
    letter-spacing: -0.01em;
    overflow-x: hidden;
}

/* 光晕背景 */
.glow-bg {
    position: relative;
    background: 
        radial-gradient(ellipse at 15% 20%, rgba(234, 88, 12, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 85% 65%, rgba(217, 119, 6, 0.08) 0%, transparent 60%),
        var(--bg);
}

/* 导航 */
.nav-section {
    border-bottom: 2px solid var(--border);
    background: rgba(255, 251, 245, 0.92);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-inner {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 40px;
}

.brand {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: -0.04em;
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    line-height: 1;
}

.brand i {
    font-size: 1.8rem;
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: all 0.25s;
    padding: 4px 0;
    letter-spacing: -0.01em;
}

.nav-links a:hover {
    border-bottom-color: var(--primary);
    color: var(--primary);
}

.mobile-toggle {
    display: none;
    background: none;
    border: 2px solid var(--border);
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    padding: 2px 12px;
    line-height: 1.4;
}

/* Hero 视差 */
.hero {
    position: relative;
    padding: 120px 40px 100px;
    max-width: 1440px;
    margin: 0 auto;
    border-bottom: 2px solid var(--border);
}

.hero-meta {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 24px;
    display: block;
    font-weight: 500;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 6.5rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 40px;
    max-width: 900px;
}

.hero h1 .highlight {
    color: var(--primary);
    position: relative;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    margin-top: 32px;
    border-top: 2px solid var(--border);
    padding-top: 32px;
    width: fit-content;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 500;
    line-height: 1.2;
    color: var(--text);
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text);
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.hero-desc {
    max-width: 600px;
    font-size: 1.15rem;
    line-height: 1.9;
    color: rgba(28, 25, 23, 0.85);
    margin-top: 32px;
    padding-left: 24px;
    border-left: 4px solid var(--accent);
    font-weight: 400;
}

/* 分栏长文 */
.content-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 100px 40px;
    border-bottom: 2px solid var(--border);
}

.section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    border-bottom: 2px solid var(--border);
    padding-bottom: 16px;
    margin-bottom: 64px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    color: var(--text);
}

.section-tag {
    font-family: var(--font-mono);
    color: var(--primary);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.two-col-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.long-text p {
    margin-bottom: 1.6rem;
    font-size: 1.05rem;
    color: rgba(28, 25, 23, 0.9);
    line-height: 2;
}

.long-text p strong {
    color: var(--primary);
    font-weight: 700;
}

/* 时间线样式 */
.timeline-wrap {
    margin: 48px 0 0;
}

.timeline-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 24px;
    margin-bottom: 32px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 100px;
    top: 12px;
    bottom: -24px;
    width: 2px;
    background: var(--border);
    opacity: 0.15;
}

.timeline-item:last-child::before { display: none; }

.timeline-year {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 1.2rem;
    color: var(--primary);
    line-height: 1.6;
    text-align: right;
}

.timeline-content h4 {
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.timeline-content p {
    opacity: 0.75;
    line-height: 1.8;
}

/* 对比表格 */
.compare-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 100px 40px;
    border-bottom: 2px solid var(--border);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 40px;
}

.compare-table th, .compare-table td {
    border: 2px solid var(--border);
    padding: 20px 24px;
    text-align: left;
    font-size: 1.05rem;
}

.compare-table th {
    background: transparent;
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
    color: var(--primary);
    border-bottom: 3px solid var(--border);
    width: 33%;
}

.compare-table td:first-child {
    font-weight: 700;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    background: rgba(217, 119, 6, 0.05);
}

.compare-table td i {
    color: var(--primary);
    margin-right: 10px;
}

/* FAQ */
.faq-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 100px 40px;
    border-bottom: 2px solid var(--border);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 48px 64px;
}

.faq-item h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.faq-item h4 i {
    color: var(--primary);
    font-size: 1rem;
}

.faq-item p {
    opacity: 0.78;
    line-height: 1.8;
}

/* 特色标签页切换 */
.feature-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 100px 40px;
    border-bottom: 2px solid var(--border);
}

.feature-tabs {
    display: flex;
    gap: 0;
    margin: 48px 0 32px;
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
}

.feature-tab {
    background: none;
    border: 2px solid transparent;
    border-bottom: none;
    padding: 14px 28px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text);
    transition: all 0.3s;
    letter-spacing: -0.01em;
    position: relative;
    top: 2px;
}

.feature-tab.active {
    border: 2px solid var(--border);
    border-bottom: 2px solid var(--bg);
    color: var(--primary);
    font-weight: 800;
}

.feature-tab:hover {
    color: var(--primary);
}

.feature-panel {
    display: none;
    padding: 40px 0;
    animation: fadeIn 0.5s ease;
}

.feature-panel.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.feature-panel h3 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.feature-panel p {
    opacity: 0.8;
    line-height: 2;
}

.feature-panel ul {
    list-style: none;
    margin-top: 20px;
}

.feature-panel ul li {
    padding: 8px 0;
    border-bottom: 1px dashed rgba(28, 25, 23, 0.2);
    display: flex;
    align-items: center;
    gap: 12px;
}

.feature-panel ul li i {
    color: var(--primary);
    font-size: 0.9rem;
}

/* CTA */
.cta-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 100px 40px;
    text-align: center;
    border-bottom: 2px solid var(--border);
}

.cta-section h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    margin-bottom: 32px;
    line-height: 1.2;
}

.cta-section .cta-btn {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    padding: 18px 48px;
    text-decoration: none;
    transition: all 0.3s;
    border: 2px solid var(--border);
    letter-spacing: 0.02em;
}

.cta-section .cta-btn:hover {
    background: var(--accent);
    transform: translateY(-2px);
}

/* 友情链接 */
.links-section {
    max-width: 1440px;
    margin: 0 auto;
    padding: 48px 40px;
    border-bottom: 2px solid var(--border);
}

.links-section h5 {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.links-section h5 i {
    color: var(--primary);
}

.link-box {
    padding: 24px;
    border: 2px solid var(--border);
    background: rgba(255, 251, 245, 0.5);
}

/* 回到顶部 */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--border);
    color: var(--primary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 999;
    box-shadow: none;
}

#backToTop.show {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-4px);
}

/* 页脚 */
.footer {
    max-width: 1440px;
    margin: 0 auto;
    padding: 60px 40px;
    background: var(--text);
    color: var(--bg);
    margin-top: 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer .brand-light {
    font-size: 1.8rem;
    font-weight: 900;
    color: #fffbf5;
    letter-spacing: -0.03em;
    text-decoration: none;
}

.footer-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.footer-links a {
    color: rgba(255, 251, 245, 0.7);
    text-decoration: none;
    font-size: 0.95rem;
    border-bottom: 1px solid transparent;
    transition: all 0.2s;
}

.footer-links a:hover {
    color: var(--bg);
    border-bottom-color: var(--primary);
}

.copyright {
    width: 100%;
    text-align: center;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 251, 245, 0.15);
    font-size: 0.9rem;
    opacity: 0.7;
    font-family: var(--font-mono);
}

/* 响应式 */
@media (max-width: 992px) {
    .two-col-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feature-panel.active {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 2px solid var(--border);
        padding: 20px 40px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .nav-links.open {
        display: flex;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero {
        padding: 80px 24px;
    }
    
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .content-section, .compare-section, .faq-section, .feature-section, .cta-section, .links-section, .footer {
        padding-left: 24px;
        padding-right: 24px;
    }
    
    .hero-stats {
        gap: 32px;
        flex-wrap: wrap;
    }
    
    .stat-num {
        font-size: 2.5rem;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .brand {
        font-size: 1.6rem;
    }
    
    .timeline-item {
        grid-template-columns: 70px 1fr;
        gap: 16px;
    }
    
    .compare-table th, .compare-table td {
        padding: 12px;
        font-size: 0.9rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}

/* --- 子页面追加 --- */
.about-hero { padding: 4rem 0 2rem; }
.about-hero h1 { font-size: 2.6rem; font-weight: 800; margin-bottom: 1rem; }
.about-hero .lead { max-width: 720px; margin: 0 auto 1.5rem; opacity: .85; font-weight: 400; }
.about-meta { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; margin-top: 1.5rem; }
.about-meta span { font-family: var(--font-mono); font-size: .9rem; background: rgba(234,88,12,.08); padding: .35rem 1rem; border-radius: 100px; border: 1px solid rgba(234,88,12,.25); }
.about-stats-row { display: flex; justify-content: center; gap: 3rem; flex-wrap: wrap; margin: 2rem 0; padding: 1.5rem 0; border-top: 1px dashed rgba(28,25,23,.2); border-bottom: 1px dashed rgba(28,25,23,.2); }
.about-stats-row .item { text-align: center; }
.about-stats-row .num { font-size: 2rem; font-weight: 800; color: var(--primary); }
.about-stats-row .label { font-size: .85rem; opacity: .7; }
.about-block { max-width: 780px; margin: 0 auto 3rem; }
.about-block h2 { font-size: 1.7rem; font-weight: 700; margin-bottom: 1.2rem; display: flex; align-items: center; gap: .6rem; }
.about-block h2 i { color: var(--primary); font-size: 1.4rem; }
.about-block p { line-height: 1.8; margin-bottom: 1.2rem; }
.about-block .note-box { background: rgba(234,88,12,.06); border-left: 4px solid var(--primary); padding: 1rem 1.4rem; border-radius: 0 8px 8px 0; margin: 1.5rem 0; }
.about-block .note-box p { margin: 0; font-size: .95rem; }
.value-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.2rem; margin: 2rem 0; }
.value-item { border: 1px solid rgba(28,25,23,.15); border-radius: 12px; padding: 1.4rem; background: rgba(255,255,255,.6); transition: .3s; }
.value-item:hover { border-color: var(--primary); box-shadow: 0 4px 20px rgba(234,88,12,.1); }
.value-item i { font-size: 1.8rem; color: var(--primary); margin-bottom: .8rem; display: block; }
.value-item h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: .5rem; }
.value-item p { font-size: .9rem; line-height: 1.6; opacity: .8; margin: 0; }
.timeline-about { list-style: none; padding: 0; margin: 2rem 0; }
.timeline-about li { display: flex; gap: 1.2rem; margin-bottom: 1.5rem; align-items: flex-start; }
.timeline-about .year { font-family: var(--font-mono); font-weight: 700; color: var(--primary); min-width: 70px; font-size: 1rem; padding-top: .2rem; }
.timeline-about .desc { flex: 1; }
.timeline-about .desc p { margin: 0 0 .4rem; }
.about-hero h1 { font-size: 2rem; }
.about-hero .lead { font-size: .95rem; }

/* --- 子页面追加 --- */
/* 保证子页面与首页视觉完全一致 —— 只额外补充指南特有的小结构 */
    .guide-hero {
      padding: 3.5rem 0 1.5rem;
    }
.step-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 3rem;
      height: 3rem;
      background: rgba(234, 88, 12, 0.08);
      border: 1px solid var(--border);
      border-radius: 50%;
      font-size: 1.4rem;
      color: var(--primary);
      margin-right: .8rem;
    }
.guide-card {
      border: 1px solid var(--border);
      background: #fff;
      background: rgba(255, 255, 255, 0.7);
      backdrop-filter: blur(2px);
      padding: 1.6rem 1.5rem;
      border-radius: 1rem;
      box-shadow: 0 4px 14px rgba(0,0,0,0.02);
      transition: 0.2s ease;
      height: 100%;
    }
.guide-card:hover {
      transform: translateY(-3px);
      border-color: var(--primary);
      box-shadow: 0 8px 20px rgba(234,88,12,0.08);
    }
.guide-card h3 {
      font-size: 1.35rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-top: .8rem;
      margin-bottom: .7rem;
      display: flex;
      align-items: center;
    }
.guide-card p {
      font-size: 0.98rem;
      line-height: 1.6;
      color: #292524;
    }
.guide-card .tag {
      display: inline-block;
      font-size: .75rem;
      letter-spacing: .04em;
      text-transform: uppercase;
      font-weight: 600;
      border-bottom: 2px solid var(--primary);
      padding-bottom: 2px;
      margin-bottom: 12px;
    }
.shortcut-list {
      list-style: none;
      padding-left: 0;
      margin-bottom: 0;
    }
.shortcut-list li {
      display: flex;
      justify-content: space-between;
      padding: .45rem 0;
      border-bottom: 1px dashed rgba(28,25,23,0.15);
      font-size: .95rem;
    }
.shortcut-list li:last-child {
      border-bottom: none;
    }
.shortcut-key {
      font-family: var(--font-mono);
      background: #f1f0ef;
      padding: .15rem .7rem;
      border-radius: 6px;
      font-size: .8rem;
      border: 1px solid var(--border);
      font-weight: 500;
      color: var(--primary);
    }
.accent-block {
      background: rgba(234,88,12,0.04);
      border-left: 5px solid var(--primary);
      padding: 1.2rem 1.4rem;
      border-radius: 0 12px 12px 0;
      margin: 1.8rem 0;
    }
.mono {
      font-family: var(--font-mono);
    }

/* --- 子页面追加 --- */
/* 本页专属小范围样式，自动合并进站点CSS */
        .privacy-hero {
            padding: 80px 0 40px;
            background: var(--bg);
            border-bottom: 2px solid var(--border);
        }
.privacy-content {
            padding: 60px 0;
        }
.privacy-block {
            margin-bottom: 48px;
        }
.privacy-block h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--primary);
            display: inline-block;
            color: var(--text);
        }
.privacy-block h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 12px;
            color: var(--primary);
        }
.privacy-block p {
            line-height: 1.8;
            margin-bottom: 16px;
            color: var(--text);
        }
.privacy-block ul {
            margin-bottom: 16px;
            padding-left: 20px;
        }
.privacy-block li {
            margin-bottom: 8px;
            line-height: 1.7;
        }
.last-updated {
            font-family: var(--font-mono);
            font-size: 0.9rem;
            color: var(--accent);
            margin-bottom: 32px;
        }
.table-of-contents {
            background: var(--bg);
            border: 2px solid var(--border);
            padding: 24px;
            margin-bottom: 48px;
            box-shadow: 4px 4px 0 var(--border);
        }
.table-of-contents h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
.table-of-contents a {
            display: block;
            padding: 6px 0;
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
        }
.table-of-contents a:hover {
            color: var(--primary);
        }
.highlight-box {
            background: rgba(234, 88, 12, 0.05);
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            margin: 20px 0;
        }
.highlight-box p {
            margin-bottom: 0;
        }
.privacy-block strong {
            color: var(--primary);
        }
.privacy-block a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
.privacy-block a:hover {
            color: var(--accent);
        }
.divider {
            border-top: 2px dashed var(--border);
            margin: 32px 0;
        }