:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --light: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
    --success: #22c55e;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #0ea5e9 100%);
    --gradient-dark: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
}

a {
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--dark);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn-outline {
    background: transparent;
    color: var(--dark);
    border: 2px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark);
    cursor: pointer;
}

.mobile-panel {
    display: none;
    border-top: 1px solid var(--border);
    background: white;
}

.mobile-panel.open {
    display: block;
}

.mobile-panel a {
    display: block;
    padding: 14px 24px;
    text-decoration: none;
    color: var(--dark);
    border-bottom: 1px solid #f1f5f9;
    font-weight: 600;
}

.doc-hero {
    padding: 152px 0 88px;
    background: linear-gradient(180deg, #f8fafc 0%, #fff 100%);
    position: relative;
    overflow: hidden;
}

.doc-hero::before {
    content: "";
    position: absolute;
    top: -220px;
    right: -180px;
    width: 620px;
    height: 620px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
}

.doc-hero::after {
    content: "";
    position: absolute;
    bottom: -260px;
    left: -180px;
    width: 560px;
    height: 560px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
}

.doc-hero .container {
    position: relative;
    z-index: 1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
}

.page-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.doc-hero h1 {
    font-size: 3.15rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.doc-hero p {
    font-size: 1.18rem;
    color: var(--gray);
    margin-bottom: 32px;
    line-height: 1.75;
}

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

.hero-panel {
    background: white;
    border: 1px solid rgba(99, 102, 241, 0.14);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 30px 70px rgba(15, 23, 42, 0.12);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 18px;
}

.panel-title i {
    color: var(--primary);
}

.quick-list {
    list-style: none;
    display: grid;
    gap: 14px;
}

.quick-list li {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 12px;
    align-items: start;
    color: var(--gray);
    font-size: 0.95rem;
}

.quick-list i {
    color: var(--success);
    margin-top: 4px;
}

.doc-shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 44px;
    padding: 80px 24px 100px;
}

.toc {
    position: sticky;
    top: 96px;
    align-self: start;
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
}

.toc h2 {
    font-size: 0.85rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}

.toc a {
    display: block;
    color: var(--dark);
    text-decoration: none;
    padding: 9px 0;
    font-size: 0.95rem;
    border-top: 1px solid #e8eef7;
}

.toc a:hover {
    color: var(--primary);
}

.doc-content {
    min-width: 0;
}

.doc-section {
    scroll-margin-top: 100px;
    margin-bottom: 64px;
}

.doc-section h2 {
    font-size: 2rem;
    line-height: 1.2;
    margin-bottom: 16px;
}

.doc-section > p {
    color: var(--gray);
    margin-bottom: 24px;
    font-size: 1.05rem;
}

.info-grid,
.step-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.info-card,
.step-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.05);
    min-width: 0;
}

.info-card h3,
.step-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.08rem;
    margin-bottom: 12px;
}

.info-card h3 i,
.step-card h3 i {
    color: var(--primary);
}

.info-card p,
.step-card p,
.info-card li,
.step-card li {
    color: var(--gray);
    font-size: 0.95rem;
}

.info-card ul,
.step-card ul {
    padding-left: 18px;
}

.info-card li,
.step-card li {
    margin: 8px 0;
}

.callout {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(14, 165, 233, 0.08));
    border: 1px solid rgba(99, 102, 241, 0.18);
    border-radius: 16px;
    padding: 22px 24px;
    margin: 24px 0;
    color: var(--dark);
}

.callout strong {
    color: var(--primary-dark);
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 16px;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

th,
td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

th {
    background: var(--light);
    font-size: 0.88rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

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

code {
    font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
    background: #eef2ff;
    color: var(--primary-dark);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 0.9em;
    overflow-wrap: anywhere;
    word-break: break-word;
}

pre {
    background: #0f172a;
    color: #a5f3fc;
    border-radius: 16px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    font-size: 0.92rem;
    line-height: 1.7;
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    overflow-wrap: normal;
    word-break: normal;
}

.checklist {
    display: grid;
    gap: 12px;
}

.check-item {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: 12px;
    align-items: start;
    padding: 14px 16px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--gray);
}

.check-item i {
    color: var(--success);
    margin-top: 3px;
}

.footer {
    background: var(--dark);
    color: white;
    padding: 56px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 44px;
    margin-bottom: 36px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.65);
    margin-top: 16px;
    font-size: 0.95rem;
}

.footer-col h4 {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.72);
    text-decoration: none;
    font-size: 0.95rem;
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.88rem;
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

@media (max-width: 1024px) {
    .nav-links,
    .nav-buttons {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

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

    .toc {
        position: static;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 720px) {
    .container {
        padding: 0 20px;
    }

    .doc-hero {
        padding: 120px 0 64px;
    }

    .doc-hero h1 {
        font-size: 2.3rem;
    }

    .doc-hero p {
        font-size: 1.02rem;
    }

    .hero-actions,
    .footer-bottom {
        flex-direction: column;
    }

    .info-grid,
    .step-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .doc-shell {
        padding: 56px 20px 80px;
    }

    pre code {
        white-space: pre-wrap;
        overflow-wrap: anywhere;
        word-break: break-word;
    }
}