:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1f66b8;
  --primary-soft: #eaf4ff;
  --ink: #112238;
  --muted: #607088;
  --line: #dce8f6;
  --card: #ffffff;
  --bg: #f6f9fe;
  --bg-2: #eef6ff;
  --shadow: 0 16px 48px rgba(31, 91, 154, .10);
  --radius: 22px;
}

* { 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: linear-gradient(180deg, #f8fbff 0%, #ffffff 42%, #f5f9ff 100%);
  line-height: 1.72;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, 1160px); margin: 0 auto; }
.section { padding: 54px 0; }
.section-tight { padding: 34px 0; }
.section-head { margin-bottom: 24px; max-width: 760px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-kicker, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  border: 1px solid rgba(70,139,223,.18);
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: var(--ink); }
h1 { font-size: clamp(30px, 7vw, 58px); letter-spacing: -1.2px; }
h2 { font-size: clamp(24px, 4vw, 36px); letter-spacing: -.5px; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; color: var(--muted); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(218,231,246,.86);
}
.nav-wrap {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800; color: #17314f; }
.logo { width: 36px; height: 36px; object-fit: contain; }
.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--primary-dark);
  font-size: 20px;
}
.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 74px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 8px; }
.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #334a66;
  font-weight: 650;
}
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.hero {
  padding: 42px 0 56px;
  background:
    radial-gradient(circle at 20% 10%, rgba(70,139,223,.16), transparent 30%),
    radial-gradient(circle at 86% 8%, rgba(70,139,223,.10), transparent 30%),
    linear-gradient(180deg, #f7fbff, #fff);
}
.hero-layout { display: grid; gap: 30px; align-items: center; }
.hero-copy { max-width: 660px; }
.hero-copy p.lead { font-size: 17px; color: #455b76; margin-bottom: 22px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }
.hero-tags span, .soft-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  color: #24496f;
  background: rgba(255,255,255,.75);
  border: 1px solid rgba(70,139,223,.18);
  box-shadow: 0 8px 24px rgba(70,139,223,.06);
  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;
  letter-spacing: .2px;
  box-shadow: 0 14px 30px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  border: 0;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 34px rgba(70,139,223,.32); }
.hero-visual {
  position: relative;
  min-height: 420px;
  border-radius: 30px;
  background: linear-gradient(145deg, #ffffff, #edf6ff);
  border: 1px solid rgba(70,139,223,.18);
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: 24px;
}
.app-frame {
  width: min(290px, 74vw);
  margin: 0 auto;
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 28px 58px rgba(28,86,145,.16);
  border: 1px solid rgba(70,139,223,.16);
  padding: 12px;
}
.status-card, .mini-card {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(70,139,223,.18);
  border-radius: 18px;
  box-shadow: 0 14px 34px rgba(34,91,151,.12);
  padding: 14px;
}
.status-card { margin-top: 16px; }
.status-line { display: flex; justify-content: space-between; align-items: center; margin: 8px 0; color: #47617d; font-size: 14px; }
.status-dot { width: 9px; height: 9px; border-radius: 999px; background: var(--primary); display: inline-block; margin-right: 6px; }
.float-tags { display: grid; gap: 10px; margin-top: 14px; }
.float-tags span {
  padding: 10px 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid rgba(70,139,223,.16);
  color: #2b5179;
  font-size: 13px;
  font-weight: 700;
}

.stats-bar {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.stat-item { padding: 14px; border-radius: 16px; background: linear-gradient(180deg, #f8fbff, #eef6ff); }
.stat-item strong { display: block; font-size: 17px; color: #173f6c; }
.stat-item span { color: var(--muted); font-size: 14px; }

.grid, .category-grid, .feature-grid, .scenario-grid, .related-grid { display: grid; gap: 16px; }
.card, .category-card, .feature-card, .scenario-card, .faq-item, .guide-card, .info-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 12px 34px rgba(26,84,145,.07);
}
.category-card, .scenario-card, .guide-card { transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.category-card:hover, .scenario-card:hover, .guide-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.42); box-shadow: var(--shadow); }
.card-link { display: inline-flex; margin-top: 8px; color: var(--primary-dark); font-weight: 800; }
.feature-card .icon, .category-card .icon {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 900;
  margin-bottom: 12px;
}

.process-steps { counter-reset: step; display: grid; gap: 14px; }
.step-card {
  position: relative;
  padding: 22px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(35,88,145,.06);
}
.step-card::before {
  counter-increment: step;
  content: counter(step);
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
}
.security-layout { display: grid; gap: 22px; align-items: center; }
.security-panel {
  border-radius: 28px;
  padding: 24px;
  background: linear-gradient(145deg, #ffffff, #eef7ff);
  border: 1px solid rgba(70,139,223,.18);
  box-shadow: var(--shadow);
}
.security-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: #47617d;
}
.security-row:last-child { border-bottom: 0; }
.security-row b { color: #173f6c; }

.article-hero { padding: 46px 0 24px; background: linear-gradient(180deg, #f4f9ff, #fff); }
.article-wrap { width: min(100% - 32px, 920px); margin: 0 auto; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-content h2 { margin-top: 28px; }
.article-content ul, .article-content ol { padding-left: 20px; color: var(--muted); }
.article-content li { margin-bottom: 8px; }
.tip-box {
  padding: 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, #f6fbff, #eaf4ff);
  border: 1px solid rgba(70,139,223,.18);
  margin: 22px 0;
}
.notice-list { display: grid; gap: 10px; margin: 18px 0; }
.notice-list div { padding: 14px; border-radius: 16px; background: #f7fbff; border: 1px solid var(--line); }

.cta-section {
  text-align: center;
  padding: 42px 24px;
  border-radius: 30px;
  background: linear-gradient(135deg, #eaf4ff, #ffffff 58%, #edf7ff);
  border: 1px solid rgba(70,139,223,.18);
  box-shadow: var(--shadow);
}
.text-link { color: var(--primary-dark); font-weight: 800; border-bottom: 1px solid rgba(70,139,223,.35); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin-bottom: 8px; }

.site-footer {
  margin-top: 54px;
  padding: 42px 0 20px;
  background: #10243d;
  color: #d9e7f7;
}
.site-footer p, .site-footer a { color: #b9cbe0; }
.footer-grid { display: grid; gap: 22px; }
.footer-brand { font-size: 20px; font-weight: 900; color: #fff; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; margin: 8px 0; }
.footer-bottom { width: min(100% - 32px, 1160px); margin: 26px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #91a6bf; font-size: 13px; }

@media (min-width: 680px) {
  .category-grid, .feature-grid, .scenario-grid, .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-card { padding: 34px; }
}
@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; border-radius: 0; box-shadow: none; background: transparent; }
  .site-nav a { padding: 9px 12px; }
  .hero { padding: 72px 0 76px; }
  .hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 46px; }
  .hero-visual { min-height: 520px; }
  .float-tags { position: absolute; left: 24px; right: 24px; bottom: 24px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .status-card { position: absolute; right: 24px; top: 28px; width: 236px; margin-top: 0; }
  .app-frame { margin-left: 26px; }
  .stats-bar { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid, .scenario-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .security-layout { grid-template-columns: 1fr .92fr; }
  .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 1160px) {
  .section { padding: 72px 0; }
}