:root {
  --primary: rgb(70, 139, 223);
  --primary-dark: rgb(40, 95, 172);
  --primary-soft: rgba(70, 139, 223, .12);
  --ink: #112033;
  --muted: #607086;
  --line: #dbe8f8;
  --panel: rgba(255, 255, 255, .82);
  --bg: #f6faff;
  --card-shadow: 0 18px 50px rgba(32, 90, 162, .09);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}
* { 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:
    radial-gradient(circle at 20% 0%, rgba(70,139,223,.16), transparent 30%),
    linear-gradient(180deg, #ffffff 0%, #f4f9ff 42%, #ffffff 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: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(211,226,247,.8);
}
.nav-shell, .container, .footer-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}
.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo img { border-radius: 12px; box-shadow: 0 8px 18px rgba(70,139,223,.18); }
.primary-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 76px;
  display: none;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--card-shadow);
}
.primary-nav.open { display: grid; }
.primary-nav a { padding: 10px 12px; color: #55677c; border-radius: 12px; font-size: 14px; }
.primary-nav a.active, .primary-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary-dark);
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 700;
}
.section { padding: 64px 0; }
.section-tight { padding: 40px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 5vw, 44px); line-height: 1.15; letter-spacing: -.04em; }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.eyebrow, .category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid rgba(70,139,223,.18);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 16px;
}
.hero-banner { padding: 64px 0 42px; }
.hero-layout {
  display: grid;
  gap: 28px;
  align-items: center;
}
.hero-copy h1 {
  margin: 0;
  font-size: clamp(36px, 9vw, 68px);
  line-height: 1.05;
  letter-spacing: -.06em;
}
.hero-copy p { color: var(--muted); font-size: 17px; margin: 20px 0 24px; }
.hero-tags, .status-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .status-tags span, .tag-row span {
  font-size: 13px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.76);
  border: 1px solid var(--line);
  color: #44617f;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(70,139,223,.26);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 32px rgba(70,139,223,.3); }
.hero-visual {
  position: relative;
  padding: 18px;
  border: 1px solid rgba(199,221,248,.9);
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(236,246,255,.86));
  box-shadow: var(--card-shadow);
  overflow: hidden;
}
.hero-visual:before {
  content: "";
  position: absolute;
  inset: auto -70px -90px auto;
  width: 240px;
  height: 240px;
  background: rgba(70,139,223,.16);
  border-radius: 50%;
}
.app-stage { position: relative; z-index: 1; display: grid; gap: 14px; }
.app-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 18px;
  min-height: 330px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.app-card img { max-height: 420px; object-fit: contain; border-radius: 24px; }
.status-card {
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 12px 32px rgba(50,95,150,.08);
}
.status-card strong { display: block; color: #14365a; }
.status-card span { color: var(--muted); font-size: 13px; }
.metrics-strip, .feature-grid, .category-grid, .scenario-grid, .recommend-grid, .mini-grid {
  display: grid;
  gap: 16px;
}
.metrics-strip { grid-template-columns: 1fr; }
.metric, .feature-card, .category-card, .scenario-card, .faq-item, .principle-card, .doc-card, .step-card, .process-card, .recommend-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: 0 10px 30px rgba(50,95,150,.06);
}
.metric strong { display: block; font-size: 18px; margin-bottom: 6px; }
.metric p, .feature-card p, .category-card p, .scenario-card p, .principle-card p, .doc-card p, .step-card p, .process-card p, .recommend-card p { margin: 0; color: var(--muted); }
.feature-grid, .category-grid, .scenario-grid, .recommend-grid { grid-template-columns: 1fr; }
.feature-card.large { background: linear-gradient(145deg, #fff, #eef7ff); }
.feature-icon, .step-num {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 900;
  margin-bottom: 14px;
}
.card-link { display: inline-flex; color: var(--primary-dark); font-weight: 800; margin-top: 12px; }
.steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; overflow: hidden; }
.step-card:after {
  content: "";
  position: absolute;
  left: 36px;
  bottom: -30px;
  width: 2px;
  height: 42px;
  background: var(--line);
}
.step-card:last-child:after { display: none; }
.security-layout {
  display: grid;
  gap: 24px;
  align-items: start;
}
.security-panel {
  border-radius: var(--radius-xl);
  padding: 26px;
  background: linear-gradient(145deg, #ffffff, #edf7ff);
  border: 1px solid var(--line);
  box-shadow: var(--card-shadow);
}
.principle-list { display: grid; gap: 12px; margin-top: 18px; }
.principle-card { padding: 16px; }
.process-steps { display: grid; gap: 16px; }
.process-card h3, .feature-card h3, .category-card h3, .scenario-card h3, .recommend-card h3 { margin: 0 0 8px; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
  text-align: center;
  padding: 48px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.92));
  box-shadow: var(--card-shadow);
}
.cta-section p { color: var(--muted); max-width: 680px; margin: 0 auto 20px; }
.doc-hero { padding: 54px 0 24px; }
.doc-hero h1 { margin: 0 0 14px; font-size: clamp(32px, 7vw, 54px); line-height: 1.12; letter-spacing: -.05em; }
.doc-hero p { color: var(--muted); max-width: 820px; }
.doc-layout { display: grid; gap: 22px; align-items: start; }
.doc-content {
  background: rgba(255,255,255,.82);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--card-shadow);
}
.doc-content h2 { margin-top: 0; }
.doc-content p { color: #4e5f73; }
.check-list { display: grid; gap: 10px; padding: 0; margin: 16px 0; list-style: none; }
.check-list li {
  padding: 12px 14px;
  border-radius: 14px;
  background: #f5faff;
  border: 1px solid var(--line);
}
.notice {
  border-left: 4px solid var(--primary);
  padding: 16px;
  border-radius: 14px;
  background: rgba(70,139,223,.09);
  color: #30506f;
}
.aside-panel { display: grid; gap: 14px; }
.site-footer { margin-top: 40px; padding: 42px 0; background: #0f2742; color: rgba(255,255,255,.82); }
.footer-shell { display: grid; gap: 22px; }
.footer-brand { font-weight: 900; color: #fff; font-size: 20px; margin-bottom: 8px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: rgba(255,255,255,.75); padding: 8px 10px; border: 1px solid rgba(255,255,255,.14); border-radius: 999px; }
@media (min-width: 640px) {
  .metrics-strip, .category-grid, .scenario-grid, .recommend-grid, .mini-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .primary-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .hero-layout { grid-template-columns: 1fr 1fr; gap: 46px; }
  .hero-banner { padding: 88px 0 58px; }
  .app-stage { grid-template-columns: 1.3fr .8fr; align-items: center; }
  .app-card { grid-row: span 4; min-height: 480px; }
  .metrics-strip { grid-template-columns: repeat(4, 1fr); }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-card.large { grid-column: span 2; }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .category-card.wide { grid-column: span 2; }
  .security-layout { grid-template-columns: 1fr .86fr; gap: 38px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .step-card:after { left: auto; right: -26px; top: 50%; bottom: auto; width: 36px; height: 2px; }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
  .doc-content { padding: 34px; }
  .scenario-grid { grid-template-columns: repeat(5, 1fr); }
  .scenario-card:nth-child(1), .scenario-card:nth-child(2) { grid-column: span 2; }
  .recommend-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-shell { grid-template-columns: 1fr auto; align-items: center; }
}
@media (max-width: 380px) {
  .download-btn { width: 100%; }
  .hero-copy h1 { font-size: 34px; }
}