:root {
  --primary: rgb(70,139,223);
  --primary-dark: #2367b8;
  --primary-soft: #eaf4ff;
  --text: #172033;
  --muted: #65738a;
  --line: #dbe8f6;
  --surface: #ffffff;
  --surface-soft: #f6faff;
  --shadow: 0 18px 45px rgba(42, 93, 153, 0.12);
  --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(--text);
  background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 34%, #f7fbff 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, 1180px); 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(219,232,246,0.9);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 18px; }
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #17304f; }
.brand img, .footer-brand img { width: 38px; height: 38px; border-radius: 12px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 74px; padding: 14px; border-radius: 18px; background: #fff; box-shadow: var(--shadow); border: 1px solid var(--line); }
.site-nav.open { display: grid; gap: 8px; }
.site-nav a { padding: 11px 13px; color: #41516a; border-radius: 12px; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { width: 44px; height: 44px; border: 1px solid var(--line); background: #fff; border-radius: 14px; display: grid; place-content: center; gap: 5px; }
.nav-toggle span { width: 20px; height: 2px; background: #244364; border-radius: 999px; display: block; }

.section { padding: 58px 0; }
.section-title { max-width: 740px; margin: 0 auto 30px; text-align: center; }
.section-title.left { text-align: left; margin-left: 0; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 11px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-size: 13px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: #172033; }
h1 { font-size: clamp(34px, 7vw, 62px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 4vw, 40px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 18px; color: #52647a; }
.text-link { color: var(--primary-dark); font-weight: 700; }

.hero { padding: 44px 0 64px; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: -180px -120px auto auto; width: 470px; height: 470px; background: radial-gradient(circle, rgba(70,139,223,0.18), rgba(70,139,223,0)); pointer-events: none; }
.hero-layout { display: grid; gap: 34px; align-items: center; }
.hero-copy { position: relative; z-index: 1; }
.hero-copy .lead { max-width: 670px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 26px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,0.78); border: 1px solid var(--line); color: #41516a; font-size: 14px; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; min-width: 144px; padding: 13px 22px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 12px 28px rgba(70,139,223,0.28); transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 36px rgba(70,139,223,0.33); }
.hero-visual { position: relative; min-height: 500px; display: grid; place-items: center; }
.product-stage { position: relative; width: min(100%, 470px); border-radius: 34px; background: linear-gradient(145deg, rgba(255,255,255,0.84), rgba(234,244,255,0.88)); border: 1px solid rgba(219,232,246,0.9); box-shadow: var(--shadow); padding: 26px; }
.product-stage img { width: 78%; margin: 0 auto; filter: drop-shadow(0 20px 25px rgba(30,70,120,0.14)); }
.status-card, .floating-card { background: rgba(255,255,255,0.92); border: 1px solid var(--line); border-radius: 18px; padding: 14px 16px; box-shadow: 0 12px 30px rgba(42,93,153,0.12); }
.status-card { position: absolute; left: 8px; bottom: 18px; max-width: 220px; }
.status-card strong { display: block; color: #183a5c; }
.status-dot { width: 9px; height: 9px; display: inline-block; border-radius: 50%; background: #27b87a; margin-right: 8px; }
.floating-tags { display: grid; gap: 10px; position: absolute; right: 0; top: 38px; }
.floating-card { font-size: 14px; color: #2c4c70; }

.trust-strip { display: grid; gap: 14px; margin-top: -22px; position: relative; z-index: 2; }
.trust-item { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 28px rgba(42,93,153,0.08); }
.trust-item strong { display: block; margin-bottom: 4px; color: #193655; }

.category-grid, .feature-grid, .scenario-grid, .cards-grid { display: grid; gap: 18px; }
.category-card, .feature-card, .scenario-card, .info-card, .faq-item, .content-card, .step, .tip-box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 12px 32px rgba(42,93,153,0.08); }
.category-card { padding: 22px; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: rgba(70,139,223,0.45); }
.category-card span { display: inline-flex; width: 38px; height: 38px; align-items: center; justify-content: center; border-radius: 14px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; margin-bottom: 14px; }
.category-card small { color: var(--primary-dark); font-weight: 700; }
.feature-card, .scenario-card, .content-card, .info-card, .faq-item, .tip-box { padding: 24px; }
.feature-card .icon { width: 44px; height: 44px; border-radius: 16px; display: grid; place-items: center; color: var(--primary-dark); background: var(--primary-soft); font-weight: 900; margin-bottom: 16px; }

.split-layout, .security-layout, .guide-layout { display: grid; gap: 26px; align-items: center; }
.panel-gradient { padding: 26px; border-radius: 28px; background: linear-gradient(145deg, #ffffff, #eef7ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.security-list { display: grid; gap: 12px; padding: 0; margin: 18px 0 0; list-style: none; }
.security-list li { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; background: rgba(255,255,255,0.72); border: 1px solid rgba(219,232,246,0.9); border-radius: 14px; color: #4d5f77; }
.security-list li::before { content: "✓"; color: var(--primary-dark); font-weight: 900; }

.steps { display: grid; gap: 16px; counter-reset: step; }
.step { padding: 22px; position: relative; overflow: hidden; }
.step::before { counter-increment: step; content: counter(step); width: 38px; height: 38px; display: grid; place-items: center; border-radius: 14px; background: var(--primary); color: #fff; font-weight: 900; margin-bottom: 16px; }
.step::after { content: ""; position: absolute; inset: auto -40px -50px auto; width: 120px; height: 120px; border-radius: 50%; background: rgba(70,139,223,0.08); }

.cta-section { margin: 42px 0 0; padding: 34px; border-radius: 30px; text-align: center; background: linear-gradient(135deg, #eef7ff, #ffffff 58%, #eaf4ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.page-hero { padding: 52px 0 28px; }
.page-hero-inner { border-radius: 32px; background: linear-gradient(135deg, rgba(234,244,255,0.92), rgba(255,255,255,0.96)); border: 1px solid var(--line); padding: 34px; box-shadow: var(--shadow); }
.page-hero h1 { font-size: clamp(32px, 6vw, 52px); }
.guide-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 0; }
.guide-meta span { padding: 7px 11px; border-radius: 999px; color: #445873; background: #fff; border: 1px solid var(--line); font-size: 14px; }
.article-body { padding: 32px 0 58px; }
.article-body .content-card + .content-card { margin-top: 18px; }
.note-grid { display: grid; gap: 16px; margin: 22px 0; }
.note { padding: 18px; border-radius: 18px; background: #f6faff; border: 1px solid var(--line); }
.note strong { display: block; color: #173a60; margin-bottom: 6px; }
.check-list { padding: 0; margin: 12px 0 0; list-style: none; display: grid; gap: 10px; }
.check-list li { padding-left: 26px; position: relative; color: #53657c; }
.check-list li::before { content: ""; position: absolute; left: 0; top: 10px; width: 9px; height: 9px; border-radius: 50%; background: var(--primary); }
.download-panel { margin-top: 24px; padding: 26px; border-radius: 26px; background: linear-gradient(135deg, #eaf4ff, #fff); border: 1px solid var(--line); display: grid; gap: 16px; align-items: center; }
.faq-list { display: grid; gap: 16px; }
.faq-item h3 { margin-bottom: 8px; }
.notice { border-left: 4px solid var(--primary); background: #f3f9ff; padding: 16px 18px; border-radius: 16px; color: #4f6077; }

.site-footer { background: #f4f9ff; border-top: 1px solid var(--line); padding: 48px 0 18px; }
.footer-grid { display: grid; gap: 26px; }
.site-footer p { max-width: 420px; }
.site-footer h3 { font-size: 16px; margin-bottom: 12px; }
.site-footer a:not(.footer-brand) { display: block; color: #5f7088; margin: 7px 0; font-size: 14px; }
.site-footer a:hover { color: var(--primary-dark); }
.copyright { border-top: 1px solid var(--line); margin-top: 30px; padding-top: 18px; color: #7a879a; font-size: 13px; }

@media (min-width: 640px) {
  .trust-strip, .category-grid, .feature-grid, .scenario-grid, .cards-grid, .note-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .download-panel { grid-template-columns: 1fr auto; }
}

@media (min-width: 920px) {
  .container { width: min(100% - 48px, 1180px); }
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .site-nav a { padding: 9px 12px; }
  .hero { padding: 72px 0 80px; }
  .hero-layout, .split-layout, .security-layout, .guide-layout { grid-template-columns: 1.05fr .95fr; }
  .trust-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .category-grid, .feature-grid, .scenario-grid, .cards-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
  .page-hero-inner { padding: 48px; }
}

@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1180px); }
  .hero-visual { min-height: 430px; }
  .product-stage { padding: 18px; border-radius: 26px; }
  .status-card { position: static; margin-top: 14px; max-width: none; }
  .floating-tags { position: static; margin-top: 12px; }
  .page-hero-inner, .cta-section { padding: 24px; }
  .download-btn { width: 100%; }
}