:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1f5fa8;
  --primary-soft: #eaf3ff;
  --ink: #102033;
  --muted: #5c6b7d;
  --line: #dce9f7;
  --card: rgba(255, 255, 255, 0.88);
  --bg: #f7fbff;
  --shadow: 0 18px 50px rgba(38, 91, 150, 0.12);
  --radius: 22px;
}
* { 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, #f3f9ff 0%, #ffffff 44%, #f8fbff 100%);
  line-height: 1.72;
  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; }
.section { padding: 58px 0; }
.section-head { max-width: 760px; margin-bottom: 26px; }
.section-kicker, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid #d5e9ff;
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 14px; color: #0b2138; }
h1 { font-size: clamp(34px, 7vw, 64px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 4vw, 42px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
ul, ol { padding-left: 20px; color: var(--muted); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(220,233,247,0.8);
}
.nav-wrap { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #122a44; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.site-nav { display: none; flex-direction: column; position: absolute; top: 70px; left: 16px; right: 16px; padding: 14px; border: 1px solid var(--line); background: #fff; border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.is-open { display: flex; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #34465b; font-size: 15px; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.nav-toggle { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 12px; width: 42px; height: 42px; font-size: 22px; }
.hero-layout {
  display: grid;
  gap: 34px;
  align-items: center;
  padding: 58px 0 48px;
}
.hero-copy { max-width: 640px; }
.hero-copy p { font-size: 17px; }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.tag, .mini-tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.76);
  border: 1px solid var(--line);
  color: #24435f;
  font-size: 13px;
  font-weight: 700;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 26px rgba(70,139,223,0.28);
  border: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 30px rgba(70,139,223,0.32); }
.hero-panel {
  position: relative;
  padding: 22px;
  border-radius: 30px;
  background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(233,244,255,0.92));
  border: 1px solid rgba(210,230,250,0.9);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-panel::before { content: ''; position: absolute; inset: -90px -90px auto auto; width: 220px; height: 220px; border-radius: 50%; background: rgba(70,139,223,.16); }
.app-frame { position: relative; display: grid; place-items: center; padding: 18px; border-radius: 24px; background: rgba(255,255,255,.68); border: 1px solid rgba(255,255,255,.8); }
.app-frame img { width: min(310px, 86%); filter: drop-shadow(0 26px 40px rgba(23, 66, 109, .18)); }
.status-grid { display: grid; gap: 12px; margin-top: 16px; }
.status-card, .metric-card, .category-card, .feature-card, .scenario-card, .faq-item, .principle-card, .doc-card, .tip-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 28px rgba(38,91,150,.07);
}
.status-card { padding: 14px; }
.status-card strong { display: block; color: #0c2742; margin-bottom: 4px; }
.metrics { display: grid; gap: 12px; }
.metric-card { padding: 20px; }
.metric-card span { color: var(--primary-dark); font-weight: 800; font-size: 14px; }
.metric-card p { margin-bottom: 0; }
.path-grid, .category-grid, .feature-grid, .scenario-grid, .recommend-grid { display: grid; gap: 16px; }
.path-card, .category-card, .feature-card, .scenario-card { padding: 22px; }
.path-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 24px; }
.step-number { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 12px; color: #fff; background: var(--primary); font-weight: 800; margin-bottom: 12px; }
.read-link { display: inline-flex; margin-top: 8px; color: var(--primary-dark); font-weight: 800; }
.category-card { min-height: 150px; }
.category-card.featured { background: linear-gradient(145deg, #ffffff, #eaf4ff); }
.feature-card.large { background: linear-gradient(145deg, #ffffff, #edf6ff); }
.security-layout { display: grid; gap: 22px; align-items: start; }
.security-panel { display: grid; gap: 12px; }
.principle-card { padding: 18px; }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step { display: grid; grid-template-columns: 46px 1fr; gap: 12px; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px 20px; }
.faq-item h3 { font-size: 18px; }
.cta-section { text-align: center; padding: 54px 20px; border-radius: 30px; background: linear-gradient(135deg, #edf7ff, #ffffff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 58px 0 28px; }
.page-hero .summary { max-width: 760px; font-size: 17px; }
.doc-layout { display: grid; gap: 24px; align-items: start; }
.article-body { max-width: 760px; }
.article-body h2 { font-size: 28px; margin-top: 28px; }
.tip-card, .doc-card { padding: 20px; }
.side-stack { display: grid; gap: 16px; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { padding: 12px 14px; background: #f5faff; border: 1px solid var(--line); border-radius: 14px; color: #40546a; }
.check-list li::before { content: '✓'; color: var(--primary-dark); font-weight: 900; margin-right: 8px; }
.process-steps { display: grid; gap: 12px; margin: 20px 0; }
.process-card { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.site-footer { margin-top: 60px; padding: 46px 0 24px; background: #0f253d; color: #d7e5f5; }
.footer-grid { display: grid; gap: 24px; }
.footer-grid p, .footer-bottom { color: #9db2c9; }
.footer-grid h3 { color: #fff; font-size: 16px; }
.footer-grid a { display: block; color: #c9dbef; padding: 5px 0; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 12px; color: #fff; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.footer-bottom { margin-top: 28px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; }
@media (min-width: 680px) {
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .category-grid, .feature-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(2, 1fr); }
  .status-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; background: transparent; box-shadow: none; }
  .hero-layout { grid-template-columns: 1.03fr .97fr; padding: 86px 0 74px; }
  .metrics { grid-template-columns: repeat(4, 1fr); }
  .path-grid { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .category-card.featured { grid-column: span 2; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-card.large { grid-column: span 2; }
  .security-layout { grid-template-columns: 1fr .9fr; }
  .scenario-grid { grid-template-columns: repeat(5, 1fr); }
  .scenario-card { grid-column: span 1; }
  .doc-layout { grid-template-columns: minmax(0, 760px) 320px; }
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1120px); }
  .download-btn { width: 100%; }
  .hero-tags .tag { width: 100%; justify-content: center; }
}