:root {
  --primary: rgb(70,139,223);
  --primary-dark: #2768b8;
  --primary-soft: #eaf3ff;
  --ink: #122033;
  --muted: #617087;
  --line: #dce8f7;
  --card: #ffffff;
  --bg: #f7fbff;
  --shadow: 0 18px 46px rgba(31, 83, 137, .10);
  --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, #f3f8ff 0%, #ffffff 36%, #f8fbff 100%);
  line-height: 1.7;
  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: 20;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(220,232,247,.84);
}
.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--ink);
  font-size: 20px;
}
.main-nav {
  position: absolute;
  top: 68px;
  left: 16px;
  right: 16px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.97);
  box-shadow: var(--shadow);
}
.main-nav.open { display: flex; }
.main-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #3e4f66;
  font-size: 15px;
}
.main-nav a.active, .main-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.section { padding: 58px 0; }
.section-tight { padding: 34px 0; }
.section-title { max-width: 780px; margin-bottom: 28px; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: rgba(70,139,223,.11);
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 { margin: 0 0 14px; line-height: 1.22; color: var(--ink); }
h1 { font-size: clamp(34px, 8vw, 58px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 5vw, 38px); letter-spacing: -0.025em; }
h3 { font-size: 20px; }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: 18px; color: #465a73; }
.mini { font-size: 14px; color: #718197; }

.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 14px 26px rgba(70,139,223,.28);
  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 34px rgba(70,139,223,.32); }

.hero {
  padding: 54px 0 34px;
  background:
    radial-gradient(circle at 12% 16%, rgba(70,139,223,.20), transparent 28%),
    linear-gradient(135deg, #f4f9ff 0%, #ffffff 52%, #eaf4ff 100%);
  border-bottom: 1px solid rgba(220,232,247,.78);
}
.hero-layout { display: grid; gap: 34px; align-items: center; }
.hero-copy { display: grid; gap: 18px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .small-tag {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  background: #fff;
  color: #46617d;
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 700;
}
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }
.hero-visual {
  position: relative;
  min-height: 470px;
  border-radius: 32px;
  padding: 24px;
  background: linear-gradient(145deg, rgba(255,255,255,.88), rgba(234,244,255,.92));
  border: 1px solid rgba(220,232,247,.9);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-visual:before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: rgba(70,139,223,.16);
  right: -120px;
  top: -90px;
}
.app-shot { width: 235px; margin: 18px auto 0; position: relative; z-index: 2; filter: drop-shadow(0 26px 36px rgba(28,75,124,.22)); }
.float-card, .asset-card, .risk-card {
  position: absolute;
  z-index: 3;
  width: min(78%, 260px);
  padding: 14px;
  border-radius: 18px;
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(220,232,247,.92);
  box-shadow: 0 16px 34px rgba(35,80,124,.12);
  backdrop-filter: blur(12px);
}
.float-card { left: 18px; top: 22px; }
.asset-card { right: 16px; bottom: 88px; }
.risk-card { left: 18px; bottom: 22px; }
.card-line { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 8px; font-size: 14px; color: #53657d; }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 6px rgba(70,139,223,.12); }

.stats-strip {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.82);
  box-shadow: 0 12px 28px rgba(31,83,137,.06);
}
.stat-item { padding: 14px; border-radius: 18px; background: #f7fbff; }
.stat-item strong { display: block; margin-bottom: 4px; color: var(--primary-dark); font-size: 18px; }

.grid, .feature-grid, .category-grid, .scenario-grid, .page-card-grid, .faq-grid { display: grid; gap: 18px; }
.card, .category-card, .feature-card, .scenario-card, .faq-item, .guide-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.9);
  box-shadow: 0 12px 32px rgba(31,83,137,.07);
}
.card, .category-card, .feature-card, .scenario-card, .guide-panel { padding: 22px; }
.category-card { transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.45); }
.category-card span { color: var(--primary-dark); font-weight: 800; font-size: 14px; }
.feature-card .icon, .category-card .icon, .scenario-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: 14px;
}

.steps { display: grid; gap: 14px; counter-reset: step; }
.step-card {
  position: relative;
  padding: 22px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(31,83,137,.06);
}
.step-card:before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
  margin-bottom: 12px;
}
.step-card a { color: var(--primary-dark); font-weight: 800; }

.security-layout { display: grid; gap: 24px; align-items: center; }
.security-panel {
  padding: 24px;
  border-radius: 28px;
  background: linear-gradient(150deg, #ffffff, #eef7ff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.security-list { display: grid; gap: 12px; margin: 18px 0 0; padding: 0; list-style: none; }
.security-list li {
  display: flex;
  gap: 12px;
  padding: 12px;
  border-radius: 16px;
  background: rgba(255,255,255,.78);
  border: 1px solid rgba(220,232,247,.86);
}
.security-list li:before { content: "✓"; color: var(--primary-dark); font-weight: 900; }

.cta-section {
  padding: 34px;
  border-radius: 30px;
  text-align: center;
  background: linear-gradient(135deg, #eaf4ff, #ffffff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.faq-item { padding: 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 12px; margin-bottom: 0; }

.page-hero {
  padding: 48px 0 30px;
  background: linear-gradient(135deg, #f2f8ff, #ffffff);
  border-bottom: 1px solid var(--line);
}
.page-layout { display: grid; gap: 24px; }
.article-body {
  padding: 24px;
  border-radius: 28px;
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  box-shadow: 0 12px 30px rgba(31,83,137,.07);
}
.article-body p { font-size: 16px; }
.notice {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid rgba(70,139,223,.25);
  background: rgba(70,139,223,.08);
  color: #3d5874;
}
.check-list, .plain-list { padding-left: 0; list-style: none; display: grid; gap: 10px; margin: 16px 0; }
.check-list li, .plain-list li {
  padding: 12px 14px;
  border-radius: 14px;
  background: #f7fbff;
  border: 1px solid var(--line);
  color: #53657d;
}
.check-list li:before { content: "✓ "; color: var(--primary-dark); font-weight: 900; }
.timeline { display: grid; gap: 14px; margin: 18px 0; }
.timeline-item { padding: 16px; border-left: 3px solid var(--primary); background: #f7fbff; border-radius: 0 16px 16px 0; }
.download-wrap { margin-top: 22px; }

.site-footer { margin-top: 60px; padding: 42px 0 22px; background: #0f2744; color: #d8e7f8; }
.site-footer p, .site-footer a, .footer-bottom { color: #a9bfd7; }
.footer-grid { display: grid; gap: 24px; }
.footer-grid a { display: block; margin: 8px 0; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 14px; }

@media (min-width: 640px) {
  .stats-strip, .category-grid, .scenario-grid, .page-card-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .feature-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .main-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    width: auto;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }
  .main-nav a { padding: 8px 12px; }
  .hero { padding: 78px 0 54px; }
  .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 56px; }
  .hero-visual { min-height: 560px; }
  .app-shot { width: 300px; }
  .section { padding: 76px 0; }
  .stats-strip { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .feature-grid, .category-grid, .scenario-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .steps { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .security-layout { grid-template-columns: .95fr 1.05fr; }
  .page-layout { grid-template-columns: minmax(0, 1fr) 330px; align-items: start; }
  .article-body { padding: 34px; }
  .footer-grid { grid-template-columns: 1.5fr .7fr .7fr; }
}

@media (min-width: 1180px) {
  .steps.home-steps { grid-template-columns: repeat(6, minmax(0,1fr)); }
  .steps.home-steps .step-card { padding: 18px; }
}