:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fa8;
    --primary-soft: #eaf4ff;
    --ink: #102033;
    --muted: #637083;
    --line: #d9e7f6;
    --panel: #ffffff;
    --bg: #f6f9fd;
    --soft-bg: #eef6ff;
    --radius: 18px;
    --shadow: 0 12px 34px rgba(18, 63, 118, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f6f9fd 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}
.header-inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
    color: #0e2744;
}
.logo { width: 36px; height: 36px; border-radius: 10px; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    color: var(--ink);
    font-size: 20px;
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 6px; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #223650;
    font-size: 15px;
}
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.container, .content-container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}
.section { padding: 46px 0; }
.section-title { margin: 0 0 16px; font-size: clamp(25px, 4vw, 38px); line-height: 1.25; }
.section-lead { margin: 0 0 24px; color: var(--muted); max-width: 760px; }

.docs-hero {
    width: min(100% - 32px, 1160px);
    margin: 26px auto 0;
    padding: 28px 0 36px;
    display: grid;
    gap: 24px;
    align-items: center;
}
.hero-copy {
    padding: 8px 0;
}
.eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}
h1 {
    font-size: clamp(32px, 7vw, 58px);
    line-height: 1.12;
    margin: 14px 0 16px;
    letter-spacing: -0.04em;
}
.hero-copy p { color: var(--muted); font-size: 17px; margin: 0 0 20px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span {
    border: 1px solid var(--line);
    background: #fff;
    color: #334963;
    padding: 7px 11px;
    border-radius: 999px;
    font-size: 13px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    border: 1px solid var(--primary);
    box-shadow: 0 10px 26px rgba(70,139,223,.22);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); box-shadow: 0 14px 30px rgba(70,139,223,.26); }
.hero-visual {
    position: relative;
    padding: 18px;
    border-radius: 28px;
    background: linear-gradient(135deg, #eef7ff, #ffffff 62%, #e8f3ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.app-frame {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    align-items: center;
}
.app-image {
    width: min(270px, 76vw);
    margin: 0 auto;
    border-radius: 26px;
    box-shadow: 0 18px 46px rgba(20, 69, 120, .16);
}
.status-stack { display: grid; gap: 12px; }
.status-card, .security-panel, .document-card, .category-card, .faq-item, .risk-item, .step-card, .plain-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.status-card { padding: 14px; }
.status-card strong { display: block; margin-bottom: 4px; color: #17365f; }
.status-card p { margin: 0; color: var(--muted); font-size: 14px; }

.safety-strip {
    width: min(100% - 32px, 1160px);
    margin: 0 auto 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 16px;
    border-radius: 18px;
    background: var(--primary-soft);
    border: 1px solid var(--line);
}
.safety-strip span {
    flex: 1 1 210px;
    color: #244664;
    font-weight: 650;
    font-size: 14px;
}
.docs-layout {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
    display: grid;
    gap: 22px;
}
.docs-sidebar {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 14px;
    box-shadow: var(--shadow);
}
.docs-sidebar-title { font-size: 13px; color: var(--muted); font-weight: 800; margin: 0 0 10px; }
.docs-sidebar nav { display: grid; gap: 8px; }
.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #25425f;
    background: #f8fbff;
    border: 1px solid transparent;
    font-size: 14px;
}
.docs-sidebar a:hover { border-color: var(--line); background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 24px; min-width: 0; }
.doc-section {
    background: rgba(255,255,255,.86);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.doc-section h2 { margin: 0 0 12px; font-size: clamp(22px, 3vw, 32px); }
.doc-section h3 { margin: 20px 0 8px; font-size: 20px; }
.doc-section p { color: var(--muted); margin: 0 0 12px; }
.docs-category-grid, .risk-grid, .feature-grid, .faq-grid, .check-grid {
    display: grid;
    gap: 14px;
}
.category-card, .document-card, .risk-item, .faq-item, .plain-card { padding: 18px; }
.category-card h3, .document-card h3, .risk-item h3, .faq-item h3, .plain-card h3 { margin: 0 0 8px; font-size: 19px; }
.category-card p, .document-card p, .risk-item p, .faq-item p, .plain-card p { margin: 0 0 12px; color: var(--muted); }
.card-link { color: var(--primary-dark); font-weight: 800; }
.docs-steps { display: grid; gap: 12px; counter-reset: step; }
.step-card {
    position: relative;
    padding: 18px 18px 18px 58px;
}
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 16px;
    top: 18px;
    width: 30px;
    height: 30px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 12px;
}
.step-card h3 { margin: 0 0 6px; }
.step-card p { margin-bottom: 8px; }
.principle-list { display: grid; gap: 12px; }
.principle-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}
.principle-item span {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}
.principle-item strong { display: block; margin-bottom: 4px; }
.principle-item p { margin: 0; }
.notice-box, .tip-box {
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    border-radius: 16px;
    padding: 15px 16px;
    color: #244664;
}
.notice-box strong, .tip-box strong { display: block; margin-bottom: 4px; color: #12375b; }
.cta-section {
    width: min(100% - 32px, 960px);
    margin: 0 auto 56px;
    text-align: center;
    padding: 34px 20px;
    border-radius: 28px;
    background: linear-gradient(135deg, #edf7ff, #fff 70%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.cta-section h2 { margin: 0 0 10px; font-size: clamp(24px, 4vw, 36px); }
.cta-section p { margin: 0 auto 20px; max-width: 680px; color: var(--muted); }

.doc-page-header {
    width: min(100% - 32px, 960px);
    margin: 30px auto 0;
    padding: 26px 0 10px;
}
.doc-page-header h1 { font-size: clamp(30px, 5vw, 48px); margin-bottom: 12px; }
.doc-page-header p { max-width: 760px; color: var(--muted); margin: 0; }
.doc-page-layout {
    width: min(100% - 32px, 960px);
    margin: 22px auto 56px;
    display: grid;
    gap: 20px;
}
.article-body {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.article-body h2 { margin: 24px 0 10px; font-size: 24px; }
.article-body p { color: var(--muted); }
.article-body ul, .article-body ol { color: var(--muted); padding-left: 20px; }
.side-note { align-self: start; }
.side-note .plain-card { margin-bottom: 14px; }
.info-list { display: grid; gap: 10px; margin: 18px 0; padding: 0; list-style: none; }
.info-list li {
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #f9fcff;
}
.download-line { margin-top: 24px; }

.download-steps { counter-reset: down; display: grid; gap: 12px; margin: 22px 0; }
.download-steps div {
    counter-increment: down;
    padding: 15px 16px 15px 52px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    position: relative;
}
.download-steps div::before {
    content: counter(down);
    position: absolute;
    left: 16px;
    top: 15px;
    width: 26px;
    height: 26px;
    border-radius: 9px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    display: grid;
    place-items: center;
    font-weight: 900;
}

.faq-list { display: grid; gap: 14px; }
.faq-item { box-shadow: none; }
.faq-item h2, .faq-item h3 { margin: 0 0 8px; font-size: 20px; }
.faq-item p { margin: 0; }

.site-footer {
    border-top: 1px solid var(--line);
    background: #fff;
}
.footer-inner {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
    padding: 28px 0;
    display: grid;
    gap: 18px;
    color: var(--muted);
}
.footer-brand { color: var(--ink); font-weight: 900; margin-bottom: 6px; }
.footer-inner p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { padding: 7px 10px; border-radius: 999px; background: #f3f8ff; color: #31506d; font-size: 14px; }

@media (min-width: 720px) {
    .docs-category-grid, .risk-grid, .feature-grid, .faq-grid, .check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .app-frame { grid-template-columns: 0.9fr 1.1fr; }
    .article-body { padding: 30px; }
}

@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { font-size: 14px; }
    .docs-hero { grid-template-columns: minmax(0, 1.02fr) minmax(420px, .98fr); gap: 40px; padding: 52px 0 42px; }
    .docs-layout { grid-template-columns: 250px minmax(0, 1fr); align-items: start; }
    .docs-sidebar { position: sticky; top: 92px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .doc-page-layout { grid-template-columns: minmax(0, 1fr) 280px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}