:root {
  --primary: rgb(70,139,223);
  --primary-dark: rgb(34,86,154);
  --primary-soft: rgba(70,139,223,.12);
  --bg: #f7fbff;
  --surface: #ffffff;
  --surface-blue: #eef6ff;
  --text: #142338;
  --muted: #60708a;
  --line: #dce8f5;
  --shadow: 0 16px 40px rgba(36, 85, 140, .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 48%, #f8fbff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  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(--text); }
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { letter-spacing: .02em; }
.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
}
.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 76px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #31415b;
  font-size: 15px;
  font-weight: 700;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow-container { width: min(860px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 48px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(26px, 4vw, 42px); line-height: 1.25; letter-spacing: -.03em; }
.section-lead { margin: 0 0 24px; color: var(--muted); font-size: 16px; }
.docs-hero {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}
.hero-copy {
  padding: 28px 22px;
  background: linear-gradient(135deg, #ffffff 0%, #f2f8ff 100%);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(32px, 7vw, 58px); line-height: 1.12; letter-spacing: -.045em; }
.hero-copy p { margin: 0 0 22px; color: var(--muted); font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.tag, .doc-badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
}
.hero-visual {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 18px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 20% 10%, rgba(70,139,223,.18), transparent 36%), #fff;
  box-shadow: var(--shadow);
}
.app-frame { display: flex; justify-content: center; padding: 8px; }
.app-frame img { width: min(300px, 80vw); }
.security-stack { display: grid; gap: 12px; }
.security-panel, .info-card, .doc-card, .category-card, .faq-item, .risk-item, .step-card, .principle-item, .notice-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 28px rgba(36, 85, 140, .06);
}
.security-panel { padding: 16px; }
.security-panel strong { display: block; margin-bottom: 5px; }
.security-panel p { margin: 0; color: var(--muted); font-size: 14px; }
.safety-strip {
  width: min(1120px, calc(100% - 32px));
  margin: 8px auto 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px;
  background: var(--surface-blue);
  border: 1px solid #cfe4fb;
  border-left: 5px solid var(--primary);
  border-radius: 18px;
}
.safety-strip span { flex: 1 1 220px; font-size: 14px; color: #2f4866; }
.docs-layout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}
.docs-sidebar {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.docs-sidebar-title { font-size: 13px; color: var(--muted); margin: 0 0 10px; font-weight: 800; }
.docs-sidebar nav { display: grid; grid-template-columns: 1fr; gap: 8px; }
.docs-sidebar a { padding: 9px 10px; border-radius: 12px; background: #f7fbff; color: #31415b; font-weight: 700; font-size: 14px; }
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-main { display: grid; gap: 34px; min-width: 0; }
.docs-section { scroll-margin-top: 90px; }
.docs-section h2 { margin: 0 0 12px; font-size: clamp(24px, 4vw, 34px); line-height: 1.25; }
.docs-section p { color: var(--muted); margin: 0 0 16px; }
.docs-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { padding: 18px; display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.step-num {
  width: 38px; height: 38px; border-radius: 14px;
  display: grid; place-items: center;
  background: var(--primary); color: #fff; font-weight: 900;
}
.step-card h3 { margin: 0 0 6px; font-size: 18px; }
.step-card p { margin: 0 0 8px; }
.docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .cards-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.category-card, .doc-card, .risk-item, .faq-item, .info-card, .notice-card { padding: 18px; }
.category-card h3, .doc-card h3, .risk-item h3, .faq-item h3, .info-card h3 { margin: 0 0 8px; font-size: 18px; }
.category-card p, .doc-card p, .risk-item p, .faq-item p, .info-card p, .notice-card p { margin: 0 0 10px; color: var(--muted); }
.card-link { font-weight: 900; color: var(--primary-dark); }
.principle-list { display: grid; gap: 12px; }
.principle-item { padding: 18px; display: grid; grid-template-columns: 46px 1fr; gap: 14px; }
.principle-number { font-size: 20px; color: var(--primary); font-weight: 900; }
.principle-item h3 { margin: 0 0 6px; }
.principle-item p { margin: 0; color: var(--muted); }
.safety-notice {
  background: var(--surface-blue);
  border: 1px solid #cfe4fb;
  border-left: 5px solid var(--primary);
  border-radius: 16px;
  padding: 16px;
  color: #2f4866;
}
.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 !important;
  font-weight: 900;
  box-shadow: 0 12px 26px rgba(70,139,223,.22);
  transition: transform .18s ease, box-shadow .18s ease;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 16px 34px rgba(70,139,223,.28); }
.cta-section {
  text-align: center;
  padding: 34px 20px;
  border-radius: 24px;
  background: linear-gradient(135deg, #eef6ff 0%, #ffffff 100%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.cta-section h2 { margin: 0 0 10px; font-size: clamp(24px, 4vw, 34px); }
.cta-section p { margin: 0 auto 18px; max-width: 680px; color: var(--muted); }
.page-hero { padding: 42px 0 20px; }
.page-hero-box {
  background: linear-gradient(135deg, #ffffff, #f0f7ff);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 26px;
  box-shadow: var(--shadow);
}
.page-hero h1 { margin: 12px 0 12px; font-size: clamp(30px, 6vw, 48px); line-height: 1.18; letter-spacing: -.03em; }
.page-hero p { color: var(--muted); margin: 0 0 18px; }
.article-layout { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: 1fr; gap: 20px; align-items: start; }
.article-body { min-width: 0; display: grid; gap: 20px; }
.article-body section, .article-side { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: 0 10px 28px rgba(36,85,140,.05); }
.article-body h2 { margin: 0 0 12px; font-size: 24px; }
.article-body p { margin: 0 0 14px; color: var(--muted); }
.article-body ul, .article-body ol { margin: 0; padding-left: 22px; color: var(--muted); }
.article-side { display: grid; gap: 14px; }
.article-side h2 { margin: 0; font-size: 20px; }
.check-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.check-list li { padding: 10px 12px; border-radius: 12px; background: #f6fbff; border: 1px solid var(--line); color: #38506d; }
.faq-list { display: grid; gap: 14px; }
.faq-list .faq-item h2 { margin: 0 0 8px; font-size: 20px; }
.download-steps { display: grid; gap: 12px; list-style: none; margin: 0; padding: 0; }
.download-steps li { display: flex; gap: 12px; align-items: flex-start; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.download-steps span { flex: 0 0 auto; width: 32px; height: 32px; border-radius: 12px; display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 900; }
.site-footer { margin-top: 52px; background: #102238; color: #dbe8f7; }
.footer-inner { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 34px 0; display: grid; gap: 20px; }
.footer-brand { color: #fff; font-weight: 900; margin-bottom: 8px; }
.site-footer p { margin: 0; color: #b8c8dc; max-width: 680px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { color: #e7f1ff; background: rgba(255,255,255,.08); padding: 8px 10px; border-radius: 999px; }
@media (min-width: 700px) {
  .docs-category-grid, .feature-grid, .cards-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .risk-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-hero-box { padding: 34px; }
}
@media (min-width: 960px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; padding: 0; background: transparent; border: 0; box-shadow: none; gap: 4px; }
  .site-nav a { font-size: 14px; }
  .docs-hero { grid-template-columns: 1.05fr .95fr; padding: 64px 0 28px; }
  .hero-copy { padding: 46px; }
  .hero-visual { grid-template-columns: .9fr 1fr; align-items: center; padding: 26px; }
  .docs-layout { grid-template-columns: 260px 1fr; gap: 30px; }
  .docs-sidebar { position: sticky; top: 92px; }
  .docs-sidebar nav { grid-template-columns: 1fr; }
  .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .article-layout { grid-template-columns: minmax(0, 1fr) 300px; }
  .article-side { position: sticky; top: 92px; }
  .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}