:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1e5fab;
    --primary-soft: #eef6ff;
    --bg: #f7fbff;
    --text: #152033;
    --muted: #5e718d;
    --line: #dfeaf6;
    --card: #ffffff;
    --deep: #0f2442;
    --shadow: 0 16px 40px rgba(33, 86, 148, .08);
    --radius: 18px;
}
* { 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(--text);
    background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f8fbff 100%);
    line-height: 1.75;
    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,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(210,225,242,.8);
}
.header-inner, .container, .footer-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--deep); letter-spacing: -.02em; }
.logo { width: 36px; height: 36px; object-fit: contain; }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 12px;
    padding: 7px 10px;
    font-size: 20px;
    color: var(--deep);
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 66px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 10px;
}
.site-nav.open { display: grid; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #344966;
    font-size: 15px;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.section { padding: 46px 0; }
.docs-hero {
    width: min(1160px, calc(100% - 32px));
    margin: 30px auto 18px;
    display: grid;
    gap: 24px;
    align-items: center;
}
.hero-copy {
    background: linear-gradient(135deg, #fff 0%, #f3f9ff 100%);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 30px 22px;
    box-shadow: var(--shadow);
}
.eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 11px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { color: var(--deep); line-height: 1.22; margin: 0 0 14px; }
h1 { font-size: clamp(32px, 7vw, 58px); letter-spacing: -.06em; }
h2 { font-size: clamp(24px, 4vw, 34px); letter-spacing: -.03em; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero-copy p { font-size: 16px; }
.download-btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 16px 30px rgba(70,139,223,.28); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 22px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.security-tags span {
    padding: 7px 10px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: #425876;
    font-size: 13px;
}
.hero-visual {
    border: 1px solid var(--line);
    border-radius: 24px;
    background: radial-gradient(circle at 50% 12%, rgba(70,139,223,.18), transparent 40%), #fff;
    padding: 22px;
    box-shadow: var(--shadow);
}
.app-stage {
    min-height: 300px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    align-items: center;
}
.product-img { width: min(260px, 80%); margin: 0 auto; }
.security-panel {
    display: grid;
    gap: 10px;
}
.security-panel .panel-item {
    background: rgba(255,255,255,.86);
    border: 1px solid var(--line);
    border-left: 4px solid var(--primary);
    border-radius: 16px;
    padding: 12px 14px;
}
.panel-item strong { display: block; color: var(--deep); }
.panel-item span { display: block; color: var(--muted); font-size: 13px; line-height: 1.6; }
.safety-strip {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto 22px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 14px;
    border: 1px solid #cfe2f8;
    border-radius: 18px;
    background: linear-gradient(135deg, #edf6ff 0%, #f8fbff 100%);
    color: #244464;
}
.safety-strip span { flex: 1 1 230px; font-size: 14px; }
.docs-layout {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 22px;
}
.docs-sidebar {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 16px;
    box-shadow: var(--shadow);
}
.docs-sidebar strong { display: block; margin-bottom: 10px; color: var(--deep); }
.docs-sidebar nav { display: grid; gap: 7px; }
.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #455d7b;
    background: #f8fbff;
    border: 1px solid transparent;
}
.docs-sidebar a:hover { border-color: #cfe2f8; color: var(--primary-dark); }
.docs-content { min-width: 0; }
.content-panel, .doc-card, .category-card, .faq-item, .risk-item, .principle-item, .step-item, .notice, .whitepaper-block {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 26px rgba(33, 86, 148, .05);
}
.content-panel { padding: 24px; margin-bottom: 20px; }
.section-title { margin-bottom: 18px; }
.section-title span { color: var(--primary-dark); font-weight: 800; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.docs-steps { display: grid; gap: 12px; }
.step-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    padding: 16px;
}
.step-num {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}
.step-item a, .category-card a, .risk-item a, .faq-link, .text-link { color: var(--primary-dark); font-weight: 800; }
.docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .info-grid { display: grid; gap: 14px; }
.category-card, .doc-card, .risk-item, .faq-item { padding: 18px; }
.category-card { background: linear-gradient(180deg, #fff 0%, #f7fbff 100%); }
.principle-list { display: grid; gap: 12px; }
.principle-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 16px;
}
.principle-index {
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 18px;
}
.notice {
    border-left: 5px solid var(--primary);
    background: var(--primary-soft);
    padding: 16px;
    color: #244464;
}
.notice p { margin-bottom: 0; color: #355679; }
.risk-item strong { color: var(--deep); display: block; margin-bottom: 6px; }
.cta-section {
    width: min(1160px, calc(100% - 32px));
    margin: 10px auto 52px;
    padding: 34px 20px;
    text-align: center;
    border-radius: 24px;
    border: 1px solid #cfe2f8;
    background: linear-gradient(135deg, #edf6ff 0%, #ffffff 100%);
    box-shadow: var(--shadow);
}
.page-hero {
    width: min(920px, calc(100% - 32px));
    margin: 34px auto 24px;
    padding: 28px 22px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: linear-gradient(135deg, #fff 0%, #f2f8ff 100%);
    box-shadow: var(--shadow);
}
.doc-page-layout {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto 50px;
    display: grid;
    gap: 22px;
}
.article-body { display: grid; gap: 16px; }
.article-body .download-wrap { margin-top: 8px; }
.aside-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 18px;
    height: fit-content;
}
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li {
    padding: 10px 12px;
    border-radius: 12px;
    background: #f7fbff;
    border: 1px solid var(--line);
    color: #405773;
}
.check-list li::before { content: "✓"; color: var(--primary-dark); font-weight: 900; margin-right: 8px; }
.number-list { counter-reset: item; list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.number-list li {
    counter-increment: item;
    padding: 14px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 16px;
}
.number-list li::before {
    content: counter(item, decimal-leading-zero);
    display: inline-flex;
    margin-right: 10px;
    color: var(--primary-dark);
    font-weight: 900;
}
.site-footer {
    background: #10233c;
    color: #d9e7f7;
    padding: 34px 0;
}
.site-footer p { color: #aebfd4; max-width: 620px; }
.footer-inner { display: grid; gap: 22px; }
.footer-brand { color: #fff; font-size: 20px; font-weight: 900; margin-bottom: 8px; }
.footer-links { display: grid; gap: 8px; }
.footer-links a { color: #d9e7f7; }
@media (min-width: 680px) {
    .docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .app-stage { grid-template-columns: minmax(180px, 260px) 1fr; }
    .page-hero { padding: 34px; }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav {
        display: flex;
        position: static;
        box-shadow: none;
        border: 0;
        background: transparent;
        padding: 0;
        align-items: center;
        gap: 4px;
    }
    .docs-hero { grid-template-columns: 1.05fr .95fr; margin-top: 46px; }
    .hero-copy { padding: 44px; }
    .docs-layout { grid-template-columns: 245px minmax(0, 1fr); align-items: start; }
    .docs-sidebar { position: sticky; top: 88px; }
    .docs-sidebar nav { display: grid; }
    .docs-sidebar a { background: #fff; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid, .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .doc-page-layout { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; }
    .article-body { max-width: 720px; }
    .aside-card { position: sticky; top: 88px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: start; }
    .footer-links { grid-template-columns: repeat(2, auto); column-gap: 22px; }
}