:root {
  --primary: rgb(70,139,223);
  --primary-dark: #245d9f;
  --primary-soft: #edf6ff;
  --ink: #122033;
  --muted: #637083;
  --line: #d9e7f7;
  --card: #ffffff;
  --bg: #f7fbff;
  --shadow: 0 16px 42px rgba(46, 96, 150, .10);
  --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(--ink);
  line-height: 1.75;
  background: linear-gradient(180deg, #f6fbff 0%, #fff 42%, #f8fbff 100%);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.92); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #10223a; letter-spacing: .02em; }
.logo img { width: 38px; height: 38px; border-radius: 12px; }
.site-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: #fff; padding: 12px 16px 18px; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
.site-nav.open { display: grid; gap: 8px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #405168; font-weight: 650; }
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 8px 12px; color: var(--primary-dark); font-size: 22px; }
.section { padding: 58px 0; }
.section-head { margin-bottom: 24px; }
.section-kicker, .doc-badge { display: inline-flex; align-items: center; gap: 6px; color: var(--primary-dark); background: var(--primary-soft); border: 1px solid var(--line); padding: 5px 12px; border-radius: 999px; font-size: 13px; font-weight: 750; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: #0f2036; }
h1 { font-size: clamp(32px, 8vw, 56px); letter-spacing: -0.04em; }
h2 { font-size: clamp(24px, 5vw, 34px); letter-spacing: -0.02em; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; color: var(--muted); }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }
.docs-hero { padding: 54px 0 32px; background: radial-gradient(circle at 82% 10%, rgba(70,139,223,.18), transparent 32%), linear-gradient(135deg, #fff 0%, #f2f8ff 100%); border-bottom: 1px solid var(--line); }
.docs-hero-grid { display: grid; gap: 30px; align-items: center; }
.hero-copy p { font-size: 17px; max-width: 680px; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; margin: 20px 0 0; }
.hero-tags span { background: #fff; border: 1px solid var(--line); color: #42617f; padding: 8px 12px; border-radius: 999px; font-size: 13px; font-weight: 700; }
.hero-visual { background: linear-gradient(145deg, #fff, #eef7ff); border: 1px solid var(--line); border-radius: 28px; padding: 22px; box-shadow: var(--shadow); }
.app-frame { display: grid; grid-template-columns: 1fr; gap: 16px; align-items: center; }
.app-frame img { width: min(280px, 80%); margin: 0 auto; filter: drop-shadow(0 22px 28px rgba(46, 96, 150, .18)); }
.status-card, .security-panel, .info-card, .doc-card, .category-card, .faq-item, .risk-item, .principle-item, .step-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: 0 10px 28px rgba(42, 90, 150, .06); }
.status-card strong { display: block; color: #0f2036; margin-bottom: 8px; }
.status-list { display: grid; gap: 10px; margin-top: 10px; }
.status-list span { display: block; padding-left: 18px; position: relative; color: var(--muted); }
.status-list span::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--primary); position: absolute; left: 0; top: .75em; }
.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 14px 30px rgba(70,139,223,.26); border: 1px solid rgba(70,139,223,.55); transition: transform .2s ease, box-shadow .2s ease; }
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 18px 34px rgba(70,139,223,.32); }
.safety-strip { margin-top: 28px; background: #eef7ff; border: 1px solid var(--line); border-left: 5px solid var(--primary); border-radius: 18px; padding: 16px; display: grid; gap: 10px; color: #365671; font-weight: 650; }
.docs-layout { display: grid; gap: 24px; align-items: start; }
.docs-sidebar { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 14px; display: grid; gap: 6px; }
.docs-sidebar a { color: #48617c; padding: 10px 12px; border-radius: 12px; font-weight: 700; }
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 28px; min-width: 0; }
.doc-section { background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: 24px; padding: 22px; }
.docs-steps { display: grid; gap: 14px; }
.step-card { display: grid; gap: 6px; }
.step-num { width: 38px; height: 38px; border-radius: 12px; display: inline-grid; place-items: center; background: var(--primary); color: #fff; font-weight: 800; }
.step-card a, .category-card a, .risk-item a, .inline-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 { display: grid; gap: 8px; }
.principle-list { display: grid; gap: 14px; }
.principle-item { display: grid; grid-template-columns: auto 1fr; gap: 14px; }
.principle-item b { color: var(--primary-dark); font-size: 18px; }
.notice-box { background: #eef7ff; border-left: 5px solid var(--primary); border-radius: 16px; padding: 16px 18px; color: #315775; }
.warning-box { background: #fff8ed; border-left: 5px solid #e6a53f; border-radius: 16px; padding: 16px 18px; color: #76561f; }
.check-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.check-list li { padding: 12px 14px; background: #f7fbff; border: 1px solid var(--line); border-radius: 14px; color: #516176; }
.check-list li::before { content: '✓'; color: var(--primary); font-weight: 900; margin-right: 8px; }
.doc-page { padding: 44px 0 70px; }
.doc-article { display: grid; gap: 24px; }
.doc-hero-small { max-width: 860px; }
.doc-hero-small h1 { font-size: clamp(30px, 6vw, 46px); margin-top: 14px; }
.reading-layout { display: grid; gap: 24px; align-items: start; }
.reading-main { background: rgba(255,255,255,.82); border: 1px solid var(--line); border-radius: 24px; padding: 22px; min-width: 0; }
.aside-panel { background: #f4f9ff; border: 1px solid var(--line); border-radius: 22px; padding: 18px; }
.process-list { counter-reset: step; display: grid; gap: 12px; padding: 0; list-style: none; }
.process-list li { counter-increment: step; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.process-list li::before { content: counter(step, decimal-leading-zero); display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; margin-right: 10px; border-radius: 10px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; }
.cta-section { text-align: center; background: linear-gradient(135deg, #eef7ff, #fff); border: 1px solid var(--line); border-radius: 26px; padding: 34px 20px; }
.download-page-card { max-width: 880px; margin: 0 auto; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #10223a; }
.faq-item p { margin-top: 12px; }
.site-footer { border-top: 1px solid var(--line); background: #f6fbff; padding: 40px 0 22px; }
.footer-grid { display: grid; gap: 22px; }
.footer-brand { font-weight: 900; color: #10223a; margin-bottom: 8px; }
.site-footer h3 { font-size: 15px; margin-bottom: 8px; }
.site-footer a { display: block; color: #526981; padding: 4px 0; }
.footer-bottom { color: #728399; font-size: 13px; margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); }
@media (min-width: 720px) {
  .docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .safety-strip { grid-template-columns: repeat(3, 1fr); }
  .app-frame { grid-template-columns: .85fr 1fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 980px) {
  .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 { grid-template-columns: 1.04fr .96fr; }
  .docs-layout { grid-template-columns: 260px minmax(0, 1fr); }
  .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(3, minmax(0, 1fr)); }
  .reading-layout { grid-template-columns: minmax(0, 1fr) 300px; }
  .reading-main { padding: 30px; }
}
@media (max-width: 520px) {
  .container { width: min(100% - 24px, 1160px); }
  .section { padding: 42px 0; }
  .download-btn { width: 100%; }
  .doc-section, .reading-main { padding: 18px; border-radius: 20px; }
  .principle-item { grid-template-columns: 1fr; }
}