:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1d5fb5;
    --primary-soft: #eaf4ff;
    --ink: #102033;
    --muted: #617084;
    --line: #dbe7f6;
    --panel: rgba(255,255,255,.88);
    --bg: #f6faff;
    --radius: 20px;
    --shadow: 0 18px 45px rgba(34, 92, 150, .10);
}
* { 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, #ffffff 0%, #f4f9ff 46%, #ffffff 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: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,231,246,.85);
}
.header-inner, .container, .footer-inner { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 16px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo img { width: 36px; height: 36px; border-radius: 10px; }
.nav-toggle { display: inline-flex; border: 1px solid var(--line); background: white; border-radius: 12px; padding: 8px 11px; font-size: 20px; color: var(--ink); }
.main-nav { display: none; position: absolute; left: 16px; right: 16px; top: 74px; padding: 14px; background: white; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.main-nav.is-open { display: grid; }
.main-nav a { padding: 10px 12px; color: var(--muted); border-radius: 12px; font-size: 15px; }
.main-nav a:hover { color: var(--primary); background: var(--primary-soft); }
.section { padding: 54px 0; }
.section-title { margin: 0 0 10px; font-size: clamp(26px, 3vw, 38px); line-height: 1.22; letter-spacing: -.04em; }
.section-subtitle { margin: 0 0 26px; color: var(--muted); max-width: 760px; }
.docs-hero { padding: 64px 0 28px; }
.docs-hero .hero-layout { display: grid; gap: 28px; align-items: center; }
.hero-copy { padding: 22px 0; }
.eyebrow, .doc-badge, .tag { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; color: var(--primary-dark); background: var(--primary-soft); border: 1px solid #d2e7ff; padding: 6px 12px; font-size: 13px; font-weight: 700; }
.hero-copy h1 { font-size: clamp(34px, 7vw, 62px); line-height: 1.08; letter-spacing: -.06em; margin: 18px 0; }
.hero-copy p { color: var(--muted); font-size: 17px; max-width: 680px; }
.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; box-shadow: 0 12px 24px rgba(70,139,223,.24); border: 1px solid rgba(70,139,223,.25); 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-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.product-panel { position: relative; background: linear-gradient(135deg, #ffffff, #edf7ff); border: 1px solid var(--line); border-radius: 28px; padding: 22px; box-shadow: var(--shadow); overflow: hidden; }
.product-panel:before { content: ''; position: absolute; inset: -90px -80px auto auto; width: 220px; height: 220px; background: radial-gradient(circle, rgba(70,139,223,.24), transparent 70%); }
.app-frame { width: min(260px, 70%); margin: 0 auto; border-radius: 30px; filter: drop-shadow(0 24px 40px rgba(30,72,120,.16)); }
.status-stack { display: grid; gap: 12px; margin-top: 18px; }
.status-card, .small-card, .doc-card, .category-card, .risk-item, .faq-item, .principle-item, .note-card, .feature-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: 0 10px 25px rgba(47,102,162,.06); }
.status-card strong, .doc-card strong, .risk-item strong, .principle-item strong { display: block; margin-bottom: 4px; }
.status-card span, .small-card span, .doc-card p, .risk-item p, .principle-item p, .feature-card p { color: var(--muted); }
.safety-strip { margin: 22px auto 0; padding: 16px; background: #eef7ff; border: 1px solid #cfe7ff; border-left: 5px solid var(--primary); border-radius: 18px; display: grid; gap: 10px; color: #29415d; }
.safety-strip span { display: flex; gap: 8px; align-items: flex-start; }
.docs-layout { display: grid; gap: 26px; align-items: start; }
.docs-sidebar { background: rgba(255,255,255,.9); border: 1px solid var(--line); border-radius: 22px; padding: 16px; box-shadow: var(--shadow); }
.docs-sidebar .sidebar-title { font-size: 13px; color: var(--muted); font-weight: 800; letter-spacing: .12em; margin: 0 0 10px; }
.docs-sidebar a { display: block; padding: 10px 12px; color: #35506d; border-radius: 12px; font-weight: 650; }
.docs-sidebar a:hover { color: var(--primary); background: var(--primary-soft); }
.docs-content { min-width: 0; }
.doc-section { padding: 26px; background: rgba(255,255,255,.74); border: 1px solid var(--line); border-radius: 26px; margin-bottom: 22px; box-shadow: 0 12px 36px rgba(44,94,148,.07); }
.doc-section h2 { margin: 0 0 10px; font-size: clamp(23px, 3vw, 32px); letter-spacing: -.035em; }
.doc-section h3 { margin: 0 0 8px; }
.docs-steps { display: grid; gap: 14px; margin-top: 18px; }
.step-row { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.step-num { width: 40px; height: 40px; border-radius: 14px; display: inline-flex; align-items: center; justify-content: center; background: var(--primary); color: white; font-weight: 900; }
.inline-link { color: var(--primary-dark); font-weight: 800; border-bottom: 1px solid rgba(70,139,223,.35); }
.docs-category-grid, .feature-grid, .risk-grid, .scenario-grid { display: grid; gap: 16px; margin-top: 18px; }
.category-card, .feature-card { display: grid; gap: 8px; }
.category-card a, .doc-card a, .risk-item a, .scenario-card a { color: var(--primary-dark); font-weight: 800; }
.principle-list { display: grid; gap: 12px; margin-top: 18px; counter-reset: principle; }
.principle-item { display: grid; grid-template-columns: auto 1fr; gap: 14px; }
.principle-item:before { counter-increment: principle; content: counter(principle, decimal-leading-zero); width: 42px; height: 42px; border-radius: 14px; background: #e7f3ff; color: var(--primary-dark); display: inline-flex; align-items: center; justify-content: center; font-weight: 900; }
.risk-item { border-left: 4px solid var(--primary); }
.faq-list { display: grid; gap: 12px; margin-top: 18px; }
.faq-item summary { cursor: pointer; font-weight: 800; }
.faq-item p { color: var(--muted); margin-bottom: 0; }
.cta-section { text-align: center; background: linear-gradient(135deg, #eef7ff, #ffffff); border: 1px solid var(--line); border-radius: 28px; padding: 34px 20px; box-shadow: var(--shadow); }
.cta-section p { color: var(--muted); max-width: 720px; margin: 0 auto 20px; }
.page-hero { padding: 54px 0 22px; }
.page-hero-card { background: linear-gradient(135deg, rgba(255,255,255,.96), #edf7ff); border: 1px solid var(--line); border-radius: 28px; padding: 28px; box-shadow: var(--shadow); }
.page-hero-card h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.15; letter-spacing: -.05em; margin: 14px 0; }
.page-hero-card p { color: var(--muted); max-width: 820px; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-main { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 24px; box-shadow: 0 12px 32px rgba(48,100,153,.07); }
.article-main h2 { margin-top: 4px; }
.article-main p { color: #41546a; }
.article-aside { display: grid; gap: 14px; }
.check-list, .plain-list { padding-left: 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .plain-list li { position: relative; padding-left: 28px; color: #41546a; }
.check-list li:before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 900; }
.plain-list li:before { content: '•'; position: absolute; left: 6px; color: var(--primary); font-weight: 900; }
.process-list { display: grid; gap: 12px; margin: 18px 0; }
.process-list .step-row { background: #f9fcff; }
.download-single { margin-top: 24px; }
.site-footer { margin-top: 64px; background: #0f2742; color: rgba(255,255,255,.78); }
.footer-inner { display: grid; gap: 24px; padding: 34px 0; }
.footer-logo { color: #fff; font-weight: 900; font-size: 20px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: rgba(255,255,255,.78); padding: 8px 10px; border-radius: 10px; background: rgba(255,255,255,.06); }
@media (min-width: 700px) {
    .safety-strip { grid-template-columns: repeat(3, 1fr); }
    .docs-category-grid, .feature-grid, .risk-grid, .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .status-stack { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 980px) {
    .nav-toggle { display: none; }
    .main-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .docs-hero .hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr); }
    .docs-layout { grid-template-columns: 250px minmax(0, 1fr); }
    .docs-sidebar { position: sticky; top: 96px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid, .scenario-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article-main { padding: 34px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}