:root {
  --primary: rgb(70,139,223);
  --primary-dark: #255fba;
  --primary-soft: #eaf3ff;
  --text: #14223a;
  --muted: #5f7088;
  --line: #dce8f7;
  --card: rgba(255,255,255,0.92);
  --bg: #f6faff;
  --shadow: 0 18px 45px rgba(29, 82, 145, 0.11);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
  background: linear-gradient(180deg, #f7fbff 0%, #eef6ff 46%, #ffffff 100%);
  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(255,255,255,0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(214, 229, 247, 0.72);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); letter-spacing: 0.02em; }
.logo img { width: 36px; height: 36px; border-radius: 12px; box-shadow: 0 8px 20px rgba(70,139,223,.18); }
.nav-toggle { border: 1px solid var(--line); background: #fff; border-radius: 12px; width: 42px; height: 42px; color: var(--primary-dark); font-size: 20px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 72px; padding: 12px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.98); box-shadow: var(--shadow); }
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a { padding: 11px 12px; border-radius: 12px; color: #30425c; font-weight: 600; }
.site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.section { padding: 54px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(28px, 5.5vw, 42px); line-height: 1.18; letter-spacing: -0.04em; }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.hero { padding: 42px 0 58px; background: radial-gradient(circle at 20% 0%, rgba(70,139,223,.22), transparent 30%), radial-gradient(circle at 90% 15%, rgba(110,181,255,.22), transparent 32%); }
.hero-layout { display: grid; gap: 28px; align-items: center; }
.hero h1 { margin: 0 0 18px; font-size: clamp(34px, 8vw, 62px); line-height: 1.08; letter-spacing: -0.06em; }
.hero p { color: #445874; font-size: 17px; margin: 0 0 22px; }
.hero-tags, .pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.tag, .badge, .category-badge { display: inline-flex; align-items: center; border: 1px solid rgba(70,139,223,.2); background: rgba(255,255,255,.74); color: var(--primary-dark); padding: 7px 12px; border-radius: 999px; font-size: 13px; font-weight: 700; }
.category-badge { background: var(--primary-soft); margin-bottom: 16px; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 14px 28px 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 36px rgba(70,139,223,.34); }
.hero-visual { position: relative; min-height: 470px; border-radius: 32px; padding: 24px; background: linear-gradient(135deg, rgba(255,255,255,.92), rgba(234,243,255,.82)); border: 1px solid rgba(255,255,255,.8); box-shadow: var(--shadow); overflow: hidden; }
.phone-frame { width: min(260px, 78%); margin: 8px auto 0; border-radius: 34px; padding: 13px; background: #fff; box-shadow: 0 24px 60px rgba(34, 80, 140, .18); }
.phone-frame img { border-radius: 24px; width: 100%; }
.float-card { position: absolute; left: 18px; right: 18px; padding: 14px 16px; background: rgba(255,255,255,.92); border: 1px solid rgba(214,232,247,.8); border-radius: 18px; box-shadow: 0 12px 34px rgba(50, 92, 140, .12); }
.float-card strong { display: block; margin-bottom: 4px; }
.float-card span { color: var(--muted); font-size: 13px; }
.float-one { top: 20px; right: 22px; left: auto; width: 210px; }
.float-two { bottom: 30px; width: 230px; }
.float-three { bottom: 118px; left: auto; right: 20px; width: 210px; }
.status-grid, .metrics-bar { display: grid; gap: 14px; }
.metrics-bar { grid-template-columns: 1fr; }
.metric { padding: 20px; border-radius: 20px; background: rgba(255,255,255,.9); border: 1px solid var(--line); box-shadow: 0 10px 28px rgba(34, 86, 150, .08); }
.metric strong { display: block; color: var(--primary-dark); font-size: 18px; margin-bottom: 4px; }
.metric span { color: var(--muted); font-size: 14px; }
.category-grid, .feature-grid, .scenario-grid, .guide-grid, .faq-grid { display: grid; gap: 16px; }
.category-card, .feature-card, .scenario-card, .guide-card, .faq-item, .panel-card, .step-card, .notice-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 10px 30px rgba(43, 88, 150, .07);
}
.category-card:hover, .guide-card:hover { transform: translateY(-2px); border-color: rgba(70,139,223,.45); transition: .2s ease; }
.category-card h3, .feature-card h3, .scenario-card h3, .guide-card h3, .faq-item h3 { margin: 0 0 8px; font-size: 19px; }
.category-card p, .feature-card p, .scenario-card p, .guide-card p, .faq-item p, .notice-card p { margin: 0; color: var(--muted); }
.card-link { display: inline-flex; margin-top: 14px; color: var(--primary-dark); font-weight: 800; }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 74px; }
.step-card::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 22px; width: 34px; height: 34px; border-radius: 12px; display: grid; place-items: center; color: #fff; background: var(--primary); font-weight: 900; }
.step-card h3 { margin: 0 0 6px; }
.step-card p { margin: 0 0 8px; color: var(--muted); }
.security-layout { display: grid; gap: 20px; align-items: center; }
.security-panel { border-radius: 28px; background: linear-gradient(145deg, #ffffff, #ecf5ff); border: 1px solid var(--line); padding: 22px; box-shadow: var(--shadow); }
.security-line { display: flex; justify-content: space-between; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.security-line:last-child { border-bottom: 0; }
.security-line span { color: var(--muted); }
.article-hero { padding: 54px 0 26px; background: radial-gradient(circle at 20% 0%, rgba(70,139,223,.18), transparent 34%), linear-gradient(180deg, #fff, #f3f8ff); }
.article-hero h1 { margin: 0 0 14px; font-size: clamp(30px, 6vw, 48px); line-height: 1.15; letter-spacing: -0.04em; }
.article-hero p { max-width: 820px; color: var(--muted); margin: 0 0 20px; }
.article-layout { display: grid; gap: 22px; }
.article-content { background: rgba(255,255,255,.82); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 10px 30px rgba(43,88,150,.06); }
.article-content h2 { margin: 26px 0 10px; font-size: 24px; }
.article-content h2:first-child { margin-top: 0; }
.article-content p { color: #40536f; margin: 0 0 14px; }
.article-content ul, .article-content ol { color: #40536f; padding-left: 22px; }
.aside-stack { display: grid; gap: 16px; align-content: start; }
.notice-card { background: linear-gradient(145deg, #ffffff, #f0f7ff); }
.notice-card h3 { margin: 0 0 8px; }
.check-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.check-list li { padding: 12px 14px; border-radius: 15px; background: #f7fbff; border: 1px solid var(--line); color: #40536f; }
.process-list { display: grid; gap: 12px; margin: 18px 0; }
.process-item { display: grid; grid-template-columns: 38px 1fr; gap: 12px; align-items: start; padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.process-item span { width: 34px; height: 34px; border-radius: 12px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; }
.cta-section { text-align: center; padding: 44px 22px; border-radius: 30px; background: linear-gradient(135deg, #eef7ff, #ffffff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-section h2 { margin: 0 0 10px; font-size: clamp(26px, 5vw, 38px); }
.cta-section p { color: var(--muted); margin: 0 auto 22px; max-width: 720px; }
.site-footer { margin-top: 56px; padding: 44px 0 20px; background: #11233c; color: #dfeafb; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 20px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; }
.site-footer p { margin: 12px 0 0; color: #aebed4; }
.site-footer a { display: block; color: #bdd0e9; padding: 4px 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 26px; padding-top: 18px; color: #91a7c4; font-size: 13px; }
@media (min-width: 640px) {
  .metrics-bar { grid-template-columns: repeat(2, 1fr); }
  .category-grid, .feature-grid, .scenario-grid, .guide-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; position: static; align-items: center; gap: 4px; padding: 0; border: 0; background: transparent; box-shadow: none; }
  .site-nav a { padding: 8px 12px; }
  .hero { padding: 76px 0 74px; }
  .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 46px; }
  .metrics-bar { grid-template-columns: repeat(4, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .feature-grid, .scenario-grid, .guide-grid { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .security-layout { grid-template-columns: 1fr .9fr; gap: 42px; }
  .article-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
  .article-content { padding: 34px; }
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; }
}
@media (min-width: 1180px) {
  .container { width: min(1160px, calc(100% - 56px)); }
}