:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(32, 92, 168);
    --primary-soft: rgba(70,139,223,.10);
    --ink: #14233b;
    --muted: #607089;
    --line: #dce8f8;
    --paper: #ffffff;
    --soft: #f5f9ff;
    --soft-2: #eef6ff;
    --shadow: 0 14px 40px rgba(40, 85, 140, .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 38%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--primary-dark); font-size: 18px; }
.logo { width: 36px; height: 36px; border-radius: 11px; }
.site-nav { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.site-nav a { padding: 8px 11px; color: #3d4f6b; border-radius: 999px; font-size: 14px; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-hero { padding: 42px 0 22px; }
.docs-hero-grid { display: grid; gap: 28px; align-items: center; }
.eyebrow, .doc-badge { display: inline-flex; align-items: center; gap: 6px; width: fit-content; padding: 6px 12px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-size: 13px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0; color: var(--ink); }
h1 { font-size: clamp(30px, 7vw, 56px); letter-spacing: -1.5px; margin-top: 16px; }
h2 { font-size: clamp(24px, 4.5vw, 34px); margin-bottom: 16px; letter-spacing: -.5px; }
h3 { font-size: 18px; }
p { margin: 0; color: var(--muted); }
.lead { font-size: 17px; margin: 18px 0 22px; color: #4a5d78; max-width: 720px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .mini-tag { padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: #49627f; font-size: 13px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 10px 24px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 14px 30px rgba(70,139,223,.32); }
.hero-device-panel { position: relative; min-height: 440px; border-radius: 28px; padding: 26px; background: linear-gradient(145deg, rgba(70,139,223,.10), rgba(255,255,255,.92)); border: 1px solid var(--line); box-shadow: var(--shadow); overflow: hidden; }
.hero-device-panel:before { content: ""; position: absolute; inset: 18px 18px auto auto; width: 160px; height: 160px; background: radial-gradient(circle, rgba(70,139,223,.20), transparent 70%); border-radius: 50%; }
.app-shot { width: min(235px, 58vw); margin: 0 auto; filter: drop-shadow(0 22px 32px rgba(43, 91, 150, .18)); }
.float-card { position: relative; margin: 14px 0 0 auto; max-width: 310px; padding: 15px; border-radius: 18px; background: rgba(255,255,255,.86); border: 1px solid rgba(220,232,248,.9); box-shadow: 0 16px 35px rgba(28, 80, 140, .10); }
.float-card strong { display: block; color: var(--primary-dark); }
.status-list { display: grid; gap: 9px; margin-top: 12px; }
.status-list span { display: flex; justify-content: space-between; gap: 12px; color: #52657f; font-size: 13px; }
.status-list em { font-style: normal; color: var(--primary-dark); font-weight: 700; }
.section { padding: 54px 0; }
.safety-strip { margin: 22px auto 0; display: grid; gap: 10px; padding: 14px; border-radius: 20px; background: #edf6ff; border: 1px solid var(--line); }
.safety-strip div { padding: 10px 12px; border-radius: 14px; background: rgba(255,255,255,.72); color: #334965; font-size: 14px; }
.docs-layout { display: grid; gap: 24px; align-items: start; }
.docs-sidebar { background: rgba(255,255,255,.92); border: 1px solid var(--line); border-radius: 22px; padding: 16px; box-shadow: var(--shadow); }
.docs-sidebar strong { display: block; color: var(--ink); margin-bottom: 10px; }
.docs-sidebar a { display: block; padding: 10px 12px; border-radius: 14px; color: #52657f; font-size: 14px; }
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 34px; min-width: 0; }
.doc-section { padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.92); box-shadow: var(--shadow); }
.section-kicker { color: var(--primary-dark); font-weight: 800; letter-spacing: .08em; font-size: 12px; text-transform: uppercase; margin-bottom: 8px; }
.doc-intro { margin-bottom: 22px; }
.docs-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; display: grid; gap: 8px; padding: 18px; border-radius: 18px; background: #f8fbff; border: 1px solid var(--line); }
.step-card .num { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; border-radius: 12px; background: var(--primary); color: #fff; font-weight: 800; }
.step-card a, .doc-link { color: var(--primary-dark); font-weight: 800; }
.docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .card-grid { display: grid; gap: 16px; }
.category-card, .document-card, .risk-item, .faq-item, .info-card { padding: 20px; border-radius: 20px; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 26px rgba(43, 91, 150, .06); }
.category-card:hover, .document-card:hover { border-color: rgba(70,139,223,.45); transform: translateY(-2px); transition: .2s ease; }
.category-card small { color: var(--primary-dark); font-weight: 800; }
.document-card h3, .category-card h3, .risk-item h3, .faq-item h3 { margin-bottom: 8px; }
.principle-list { display: grid; gap: 14px; }
.principle { display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 18px; border-radius: 18px; background: #f8fbff; border: 1px solid var(--line); }
.principle b { width: 40px; height: 40px; border-radius: 14px; display: inline-flex; align-items: center; justify-content: center; background: var(--primary-soft); color: var(--primary-dark); }
.notice-box, .tip-box { padding: 18px; border-radius: 18px; background: #eef6ff; border-left: 4px solid var(--primary); color: #43566f; }
.risk-item { display: grid; gap: 8px; }
.risk-item .suggest { padding: 10px 12px; border-radius: 14px; background: var(--primary-soft); color: #365371; font-size: 14px; }
.cta-section { text-align: center; padding: 44px 24px; border-radius: 28px; background: linear-gradient(135deg, #eff7ff, #ffffff); border: 1px solid var(--line); }
.cta-section p { max-width: 720px; margin: 12px auto 22px; }
.page-hero { padding: 48px 0 22px; }
.page-hero .container { display: grid; gap: 16px; }
.doc-page-layout { display: grid; gap: 24px; align-items: start; padding-bottom: 56px; }
.article { padding: 26px; border-radius: 24px; background: rgba(255,255,255,.95); border: 1px solid var(--line); box-shadow: var(--shadow); }
.article p { margin: 14px 0; }
.article h2 { margin-top: 28px; }
.reading-width { max-width: 820px; }
.aside-panel { padding: 20px; border-radius: 22px; background: #f7fbff; border: 1px solid var(--line); }
.check-list, .plain-list { margin: 16px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .plain-list li { padding: 12px 14px; border-radius: 14px; background: #fff; border: 1px solid var(--line); color: #40546e; }
.check-list li:before { content: "✓"; color: var(--primary-dark); font-weight: 900; margin-right: 8px; }
.table-steps { display: grid; gap: 12px; margin-top: 18px; }
.table-step { display: grid; gap: 8px; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fbfdff; }
.table-step span { color: var(--primary-dark); font-weight: 900; }
.faq-list { display: grid; gap: 14px; }
.site-footer { margin-top: 30px; padding: 42px 0 20px; background: #0f2440; color: #dce8f8; }
.site-footer p, .site-footer a { color: #b8c7dc; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; margin-bottom: 12px; }
.site-footer a { display: block; margin: 8px 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 26px; padding-top: 18px; color: #96a9c2; font-size: 13px; }
@media (max-width: 760px) {
    .header-inner { align-items: flex-start; flex-direction: column; padding: 12px 0; }
    .site-nav { justify-content: flex-start; width: 100%; }
    .site-nav a { background: #f4f8ff; }
    .doc-section, .article { padding: 20px; }
    .hero-device-panel { min-height: auto; }
    .download-btn { width: 100%; }
}
@media (min-width: 680px) {
    .safety-strip { grid-template-columns: repeat(3, 1fr); }
    .docs-category-grid, .feature-grid, .risk-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .docs-hero { padding-top: 70px; }
    .docs-hero-grid { grid-template-columns: minmax(0, 1.04fr) minmax(340px, .96fr); }
    .docs-layout { grid-template-columns: 245px minmax(0, 1fr); }
    .docs-sidebar { position: sticky; top: 92px; }
    .docs-category-grid, .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .doc-page-layout { grid-template-columns: minmax(0, 820px) 270px; }
    .docs-steps { grid-template-columns: repeat(2, 1fr); }
    .table-step { grid-template-columns: 130px 1fr; align-items: start; }
}