:root {
  --brand: rgb(70,139,223);
  --brand-dark: #1f5eaa;
  --brand-soft: #edf6ff;
  --brand-line: #cfe4ff;
  --ink: #13243a;
  --muted: #60718a;
  --panel: #ffffff;
  --surface: #f7fbff;
  --surface-strong: #eef7ff;
  --border: #dce9f7;
  --shadow: 0 16px 38px rgba(31, 94, 170, .08);
  --radius: 18px;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f5faff 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: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(207,228,255,.75);
}
.header-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; color: #14345d; }
.logo img { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle {
  width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 14px; background: #fff;
  display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { width: 18px; height: 2px; border-radius: 2px; background: var(--ink); }
.main-nav {
  position: absolute; left: 16px; right: 16px; top: 74px; display: none; flex-direction: column; gap: 4px;
  padding: 12px; background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow);
}
.main-nav.open { display: flex; }
.main-nav a { padding: 10px 12px; color: var(--muted); border-radius: 12px; font-size: 15px; }
.main-nav a.active, .main-nav a:hover { color: var(--brand-dark); background: var(--brand-soft); }
.page-container, .hero-container, .section, .doc-page, .cta-section, .safety-strip, .docs-layout {
  width: min(var(--max), calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}
.docs-hero {
  padding: 42px 0 26px;
  background:
    radial-gradient(circle at 12% 10%, rgba(70,139,223,.15), transparent 26%),
    radial-gradient(circle at 85% 20%, rgba(70,139,223,.11), transparent 25%);
}
.hero-container { display: grid; gap: 24px; align-items: center; }
.eyebrow, .doc-badge {
  display: inline-flex; align-items: center; gap: 8px; width: max-content;
  padding: 6px 12px; border-radius: 999px; color: var(--brand-dark); background: var(--brand-soft);
  border: 1px solid var(--brand-line); font-size: 13px; font-weight: 700;
}
h1 { margin: 14px 0 14px; font-size: clamp(30px, 8vw, 56px); line-height: 1.12; letter-spacing: -.04em; color: #10243e; }
h2 { margin: 0 0 14px; font-size: clamp(24px, 5vw, 34px); line-height: 1.25; letter-spacing: -.025em; color: #12365f; }
h3 { margin: 0 0 8px; font-size: 19px; line-height: 1.35; color: #12365f; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 17px; color: #465b75; max-width: 720px; }
.download-btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px;
  border-radius: 999px; background: var(--brand); color: #fff; font-weight: 800; box-shadow: 0 12px 24px rgba(70,139,223,.22);
  border: 1px solid rgba(70,139,223,.15); transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-1px); background: var(--brand-dark); box-shadow: 0 15px 28px rgba(70,139,223,.26); }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span { padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--border); color: #31516f; font-size: 14px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 22px; }
.hero-visual { position: relative; }
.app-frame {
  background: linear-gradient(150deg, #ffffff, #edf6ff); border: 1px solid var(--border); border-radius: 28px; padding: 18px;
  box-shadow: var(--shadow);
}
.app-frame img { margin: 0 auto; max-height: 420px; object-fit: contain; }
.status-cards { display: grid; gap: 10px; margin-top: 14px; }
.status-card, .safety-card, .category-card, .doc-card, .risk-item, .faq-item, .principle-item, .feature-card, .step-item, .info-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 10px 24px rgba(31,94,170,.05);
}
.status-card { padding: 14px; }
.status-card strong { color: #143b66; display: block; margin-bottom: 3px; }
.safety-strip {
  margin-top: 16px; margin-bottom: 34px; padding: 14px; display: grid; gap: 10px; background: var(--brand-soft);
  border: 1px solid var(--brand-line); border-radius: 20px;
}
.safety-strip span { display: flex; gap: 8px; align-items: flex-start; color: #31516f; font-size: 14px; }
.safety-strip span::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--brand); margin-top: 10px; flex: 0 0 auto; }
.section { padding: 34px 0; }
.section-header { margin-bottom: 22px; max-width: 780px; }
.docs-layout { display: grid; gap: 22px; align-items: start; padding: 10px 0 32px; }
.docs-sidebar {
  background: rgba(255,255,255,.86); border: 1px solid var(--border); border-radius: 22px; padding: 12px; display: grid; gap: 6px;
}
.docs-sidebar a { padding: 10px 12px; border-radius: 12px; color: #49627d; font-weight: 650; font-size: 14px; }
.docs-sidebar a:hover { background: var(--brand-soft); color: var(--brand-dark); }
.docs-content { display: grid; gap: 28px; }
.content-block { background: #fff; border: 1px solid var(--border); border-radius: 24px; padding: 22px; }
.content-block.alt { background: linear-gradient(180deg, #ffffff, #f7fbff); }
.docs-steps { display: grid; gap: 14px; counter-reset: step; }
.step-item { padding: 18px; display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.step-number {
  width: 38px; height: 38px; border-radius: 14px; background: var(--brand-soft); color: var(--brand-dark); display: inline-flex; align-items: center; justify-content: center;
  font-weight: 900; border: 1px solid var(--brand-line);
}
.step-item a, .category-card a, .risk-item a, .doc-card a, .inline-link { color: var(--brand-dark); font-weight: 800; }
.docs-category-grid, .risk-grid, .feature-grid, .faq-grid, .info-grid { display: grid; gap: 14px; }
.category-card, .doc-card, .risk-item, .feature-card, .faq-item, .info-card { padding: 18px; }
.category-card:hover, .doc-card:hover { border-color: var(--brand-line); transform: translateY(-1px); transition: .2s ease; }
.principle-list { display: grid; gap: 12px; }
.principle-item { padding: 16px; display: grid; gap: 8px; }
.principle-index { color: var(--brand-dark); font-weight: 900; letter-spacing: .08em; }
.safety-panel {
  padding: 18px; border-left: 4px solid var(--brand); background: var(--brand-soft); border-radius: 16px; color: #31516f; margin: 18px 0;
}
.safety-panel strong { color: #143b66; }
.check-list, .simple-list { padding-left: 0; list-style: none; display: grid; gap: 10px; margin: 14px 0; }
.check-list li, .simple-list li { position: relative; padding-left: 28px; color: #526a84; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--brand-dark); font-weight: 900; }
.simple-list li::before { content: "•"; position: absolute; left: 5px; top: 0; color: var(--brand); font-weight: 900; }
.doc-page { padding: 34px 0 56px; }
.doc-shell { display: grid; gap: 22px; align-items: start; }
.doc-main { max-width: 840px; width: 100%; }
.doc-article { background: #fff; border: 1px solid var(--border); border-radius: 26px; padding: 22px; box-shadow: 0 14px 30px rgba(31,94,170,.05); }
.doc-aside { background: var(--surface); border: 1px solid var(--border); border-radius: 22px; padding: 18px; }
.doc-aside a { display: block; padding: 10px 0; color: var(--brand-dark); font-weight: 750; border-bottom: 1px solid var(--border); }
.doc-aside a:last-child { border-bottom: 0; }
.page-hero { width: min(940px, calc(100% - 32px)); margin: 0 auto; padding: 40px 0 18px; }
.page-hero.center { text-align: center; }
.page-hero.center .doc-badge { margin-left: auto; margin-right: auto; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin-bottom: 6px; }
.cta-section {
  margin-top: 24px; margin-bottom: 48px; padding: 30px 20px; text-align: center; border-radius: 28px;
  background: linear-gradient(135deg, #eef7ff, #ffffff 58%, #edf6ff); border: 1px solid var(--brand-line);
}
.cta-section p { max-width: 680px; margin: 0 auto 18px; }
.site-footer { border-top: 1px solid var(--border); background: #fff; }
.footer-inner { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; padding: 28px 0; display: grid; gap: 18px; }
.footer-brand { display: flex; gap: 12px; align-items: flex-start; }
.footer-brand img { width: 42px; height: 42px; border-radius: 13px; }
.footer-brand p { margin: 4px 0 0; font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: #4e6680; font-size: 14px; }
.download-panel { text-align: center; background: #fff; border: 1px solid var(--border); border-radius: 28px; padding: 28px; box-shadow: var(--shadow); }
.download-steps { display: grid; gap: 12px; margin: 22px 0; text-align: left; }
.download-steps .step-item { grid-template-columns: auto 1fr; }
@media (min-width: 700px) {
  .docs-category-grid, .feature-grid, .faq-grid, .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .safety-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 960px) {
  .nav-toggle { display: none; }
  .main-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; background: transparent; border: 0; box-shadow: none; }
  .main-nav a { padding: 8px 11px; }
  .docs-hero { padding: 68px 0 34px; }
  .hero-container { grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr); gap: 48px; }
  .status-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .docs-layout { grid-template-columns: 260px minmax(0, 1fr); gap: 28px; }
  .docs-sidebar { position: sticky; top: 90px; }
  .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .doc-shell { grid-template-columns: minmax(0, 840px) 280px; }
  .doc-aside { position: sticky; top: 90px; }
  .principle-item { grid-template-columns: 90px 1fr; align-items: start; }
  .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}
@media (max-width: 420px) {
  .page-container, .hero-container, .section, .doc-page, .cta-section, .safety-strip, .docs-layout, .page-hero { width: min(100% - 24px, var(--max)); }
  .doc-article, .content-block { padding: 18px; border-radius: 20px; }
  .download-btn { width: 100%; }
  .hero-actions { align-items: stretch; }
}