:root {
  --primary: rgb(70,139,223);
  --primary-dark: rgb(38,92,164);
  --primary-soft: rgba(70,139,223,.12);
  --ink: #102033;
  --muted: #607083;
  --line: #dbe8f8;
  --panel: #ffffff;
  --soft-bg: #f4f8ff;
  --blue-bg: #eaf4ff;
  --radius: 20px;
  --shadow: 0 14px 36px rgba(34, 82, 140, .10);
}
* { 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, #f7fbff 0%, #ffffff 35%, #f5f9ff 100%);
  line-height: 1.7;
  font-size: 16px;
  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; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,232,248,.9);
}
.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -.02em;
}
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { font-size: 18px; color: var(--primary-dark); }
.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  color: var(--primary-dark);
  font-size: 22px;
}
.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.96);
  box-shadow: var(--shadow);
}
.site-nav.open { display: grid; gap: 6px; }
.site-nav a {
  padding: 11px 12px;
  border-radius: 12px;
  color: #2b4158;
  font-weight: 600;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.section { padding: 56px 0; }
.section-tight { padding: 38px 0; }
.section-head { max-width: 760px; margin-bottom: 28px; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid rgba(70,139,223,.2);
  font-weight: 700;
  font-size: 13px;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; }
h1 { font-size: clamp(32px, 9vw, 58px); letter-spacing: -.05em; }
h2 { font-size: clamp(26px, 6vw, 38px); letter-spacing: -.035em; }
h3 { font-size: 20px; letter-spacing: -.02em; }
p { color: var(--muted); margin: 0 0 16px; }
ul, ol { color: var(--muted); padding-left: 20px; }
.hero {
  padding: 44px 0 42px;
  background:
    radial-gradient(circle at top left, rgba(70,139,223,.22), transparent 34%),
    linear-gradient(135deg, #f7fbff 0%, #eef7ff 48%, #ffffff 100%);
}
.hero-layout { display: grid; gap: 30px; align-items: center; }
.hero-copy p { font-size: 18px; max-width: 650px; }
.hero-tags, .mini-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 26px; }
.hero-tags span, .mini-tags span {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.86);
  border: 1px solid var(--line);
  color: #31506d;
  font-weight: 650;
  font-size: 14px;
}
.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;
  border: 1px solid rgba(70,139,223,.35);
  box-shadow: 0 12px 24px rgba(70,139,223,.22);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 14px 30px rgba(70,139,223,.26); }
.hero-visual {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
  padding: 20px;
}
.phone-card {
  position: relative;
  width: min(330px, 86vw);
  padding: 18px;
  border-radius: 34px;
  background: linear-gradient(180deg, #ffffff, #eef6ff);
  box-shadow: var(--shadow);
  border: 1px solid rgba(70,139,223,.18);
}
.phone-card img { width: 100%; border-radius: 28px; }
.status-card, .risk-card, .asset-card {
  position: absolute;
  z-index: 2;
  width: 190px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(39, 84, 139, .11);
}
.status-card { left: 4px; top: 24px; }
.asset-card { right: 0; bottom: 68px; }
.risk-card { left: 18px; bottom: 16px; }
.card-label { color: var(--muted); font-size: 12px; font-weight: 700; }
.card-value { margin-top: 4px; color: var(--ink); font-weight: 850; }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--primary); display: inline-block; margin-right: 6px; }
.data-strip {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.74);
  box-shadow: var(--shadow);
}
.data-item { padding: 14px; background: #fff; border-radius: 16px; border: 1px solid #edf3fb; }
.data-item strong { display: block; font-size: 24px; color: var(--primary-dark); }
.data-item span { color: var(--muted); font-size: 14px; }
.grid, .category-grid, .feature-grid, .scenario-grid, .article-grid, .steps-grid {
  display: grid;
  gap: 16px;
}
.category-grid { grid-template-columns: 1fr; }
.card, .category-card, .feature-card, .scenario-card, .faq-item, .notice-card, .step-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 10px 28px rgba(32, 83, 138, .07);
}
.category-card, .feature-card, .scenario-card, .step-card { transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.category-card:hover, .feature-card:hover, .scenario-card:hover, .step-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.42); box-shadow: var(--shadow); }
.card-icon, .step-num {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  margin-bottom: 12px;
}
.card-link { color: var(--primary-dark); font-weight: 800; }
.security-layout, .split-layout, .download-layout { display: grid; gap: 22px; align-items: center; }
.security-panel {
  padding: 24px;
  border-radius: 28px;
  background: linear-gradient(145deg, rgba(70,139,223,.12), #fff 70%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.security-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(219,232,248,.9);
}
.security-row:last-child { border-bottom: 0; }
.security-row span { color: var(--muted); }
.security-row strong { color: var(--primary-dark); text-align: right; }
.process-line { counter-reset: step; display: grid; gap: 14px; }
.process-item {
  position: relative;
  padding: 20px 20px 20px 58px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.process-item:before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 20px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
}
.cta-section {
  text-align: center;
  padding: 42px 22px;
  border-radius: 30px;
  background:
    radial-gradient(circle at top right, rgba(70,139,223,.20), transparent 34%),
    linear-gradient(135deg, #eff7ff, #ffffff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.page-hero {
  padding: 48px 0 28px;
  background: linear-gradient(145deg, #f6fbff 0%, #eef7ff 58%, #ffffff 100%);
}
.page-hero .container { max-width: 920px; }
.article-wrap { max-width: 920px; margin: 0 auto; }
.article-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.article-card + .article-card { margin-top: 18px; }
.tip-box {
  padding: 18px;
  border-radius: 18px;
  background: var(--blue-bg);
  border: 1px solid rgba(70,139,223,.22);
  color: #31506d;
}
.callout-list { display: grid; gap: 12px; margin-top: 18px; }
.callout-list div { padding: 14px; border-radius: 16px; background: #f8fbff; border: 1px solid var(--line); }
.faq-list { display: grid; gap: 14px; }
.faq-item h2, .faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.download-layout .card { background: linear-gradient(180deg, #fff, #f7fbff); }
.single-download { margin-top: 22px; }
.site-footer {
  margin-top: 56px;
  padding: 44px 0 24px;
  background: #102033;
  color: #dbe8f8;
}
.site-footer p, .site-footer a, .footer-bottom { color: #aebed2; }
.footer-grid { display: grid; gap: 26px; }
.footer-logo { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; padding: 4px 0; }
.footer-brand span { color: #fff; font-weight: 850; }
.footer-bottom {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.1);
  display: grid;
  gap: 8px;
  font-size: 13px;
}
@media (min-width: 640px) {
  .category-grid, .scenario-grid, .steps-grid, .data-strip { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
  .article-card { padding: 30px; }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  .site-nav a { font-size: 15px; }
  .hero { padding: 72px 0 64px; }
  .hero-layout, .security-layout, .split-layout, .download-layout { grid-template-columns: 1.02fr .98fr; }
  .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .data-strip { grid-template-columns: repeat(4, 1fr); }
  .process-line { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-bottom { display: flex; justify-content: space-between; align-items: center; }
}
@media (max-width: 430px) {
  .container { width: min(100% - 24px, 1120px); }
  .hero-visual { min-height: 470px; padding: 10px; }
  .status-card, .asset-card, .risk-card { width: 162px; padding: 12px; font-size: 13px; }
  .status-card { left: 0; top: 8px; }
  .asset-card { right: 0; bottom: 54px; }
  .risk-card { left: 0; bottom: 0; }
  .download-btn { width: 100%; }
}