:root {
  --primary: rgb(70,139,223);
  --primary-dark: #2469bb;
  --ink: #10233f;
  --muted: #5f7087;
  --soft: #f4f8ff;
  --line: #dbe8f8;
  --card: rgba(255, 255, 255, .88);
  --radius: 22px;
  --shadow: 0 18px 50px rgba(36, 94, 156, .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, #ffffff 0%, #f5f9ff 38%, #ffffff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,232,248,.75);
}
.nav-shell {
  width: min(1140px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.logo { width: 36px; height: 36px; border-radius: 12px; }
.site-nav { display: none; flex-direction: column; position: absolute; top: 68px; left: 16px; right: 16px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.site-nav.open { display: flex; }
.site-nav a { padding: 10px 12px; color: var(--muted); border-radius: 12px; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--primary); background: var(--soft); }
.nav-toggle { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 999px; padding: 8px 14px; font-weight: 700; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow { width: min(820px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 58px 0; }
.centered-hero {
  position: relative;
  padding: 82px 0 34px;
  text-align: center;
  background:
    radial-gradient(circle at 50% 8%, rgba(70,139,223,.18), transparent 38%),
    linear-gradient(180deg, #ffffff 0%, #f6faff 100%);
}
.centered-hero h1, .page-hero h1 { margin: 0 auto 18px; font-size: clamp(34px, 8vw, 72px); line-height: 1.08; letter-spacing: -.055em; max-width: 960px; }
.hero-desc { margin: 0 auto 26px; max-width: 760px; color: var(--muted); font-size: 17px; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  font-weight: 800;
  box-shadow: 0 14px 34px 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 38px rgba(70,139,223,.32); }
.trust-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 18px; }
.tag, .badge { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px; color: var(--primary-dark); background: rgba(70,139,223,.10); border: 1px solid rgba(70,139,223,.16); font-size: 13px; font-weight: 700; }
.product-bento { margin-top: 36px; display: grid; gap: 16px; }
.product-main, .glass-card, .card, .feature-card, .category-card, .scenario-card, .faq-item, .doc-card, .security-card, .road-step {
  background: var(--card);
  border: 1px solid rgba(219,232,248,.95);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.product-main { padding: 22px; position: relative; overflow: hidden; }
.product-main::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.15), transparent 42%); pointer-events: none; }
.app-frame { position: relative; z-index: 1; width: min(350px, 88%); margin: 0 auto; padding: 16px; border-radius: 32px; background: linear-gradient(180deg, #eef6ff, #fff); border: 1px solid rgba(70,139,223,.12); }
.status-stack { display: grid; gap: 14px; }
.status-card { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); box-shadow: 0 12px 30px rgba(36,94,156,.08); }
.status-card strong { display: block; margin-bottom: 4px; }
.section-title { margin-bottom: 24px; }
.section-title h2 { margin: 0 0 10px; font-size: clamp(26px, 4vw, 42px); line-height: 1.18; letter-spacing: -.035em; }
.section-title p { margin: 0; color: var(--muted); max-width: 740px; }
.center { text-align: center; }
.center p { margin-left: auto; margin-right: auto; }
.feature-grid { display: grid; gap: 16px; }
.feature-card, .category-card, .scenario-card, .doc-card { padding: 22px; }
.feature-card h3, .category-card h3, .scenario-card h3, .doc-card h3 { margin: 0 0 8px; font-size: 20px; line-height: 1.3; }
.feature-card p, .category-card p, .scenario-card p, .doc-card p, .security-card p, .road-step p { margin: 0; color: var(--muted); }
.read-link { display: inline-flex; margin-top: 14px; color: var(--primary-dark); font-weight: 800; }
.roadmap { display: grid; gap: 16px; position: relative; }
.road-step { padding: 20px; position: relative; }
.step-num { display: inline-flex; width: 34px; height: 34px; border-radius: 50%; align-items: center; justify-content: center; background: var(--primary); color: #fff; font-weight: 800; margin-bottom: 12px; }
.category-bento, .bento-grid, .scenario-grid, .doc-grid { display: grid; gap: 16px; }
.bento-card { padding: 24px; border-radius: 24px; border: 1px solid var(--line); background: linear-gradient(180deg, #fff, #f8fbff); box-shadow: var(--shadow); }
.bento-card h3 { margin: 0 0 10px; font-size: 22px; }
.bento-card p { margin: 0; color: var(--muted); }
.bento-card.large { background: linear-gradient(135deg, #ffffff, #eef6ff); }
.security-layout { display: grid; gap: 18px; align-items: center; }
.security-panel { padding: 26px; border-radius: 28px; background: linear-gradient(180deg, #eef6ff, #fff); 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 { padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-radius: 16px; color: var(--muted); }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section { padding: 54px 24px; border-radius: 32px; text-align: center; background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.92)); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-section h2 { margin: 0 0 10px; font-size: clamp(26px, 5vw, 42px); letter-spacing: -.035em; }
.cta-section p { margin: 0 auto 22px; max-width: 680px; color: var(--muted); }
.page-hero { padding: 62px 0 28px; background: linear-gradient(180deg, #f5f9ff, #fff); }
.page-hero h1 { font-size: clamp(32px, 6vw, 58px); }
.page-summary { color: var(--muted); font-size: 17px; max-width: 760px; margin: 0; }
.doc-layout { display: grid; gap: 20px; align-items: start; }
.article-body { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-body h2 { margin-top: 0; font-size: 26px; letter-spacing: -.02em; }
.article-body p { color: var(--muted); }
.checklist, .steps-list { display: grid; gap: 12px; padding: 0; margin: 18px 0; list-style: none; }
.checklist li, .steps-list li { padding: 14px 16px; border-radius: 16px; background: var(--soft); border: 1px solid var(--line); color: var(--muted); }
.side-panel { display: grid; gap: 16px; }
.alert-box { padding: 18px; border-radius: 20px; border: 1px solid rgba(70,139,223,.18); background: rgba(70,139,223,.08); color: #315274; }
.download-note { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.download-page-card { width: min(860px, calc(100% - 32px)); margin: 34px auto 0; padding: 28px; border-radius: 30px; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
.process-steps { counter-reset: step; display: grid; gap: 14px; padding: 0; list-style: none; }
.process-steps li { counter-increment: step; padding: 18px; border-radius: 18px; background: var(--soft); border: 1px solid var(--line); color: var(--muted); }
.process-steps li::before { content: counter(step); display: inline-flex; width: 30px; height: 30px; border-radius: 50%; background: var(--primary); color: #fff; align-items: center; justify-content: center; font-weight: 800; margin-right: 10px; }
.site-footer { margin-top: 64px; padding: 46px 0 24px; background: #f6faff; border-top: 1px solid var(--line); }
.footer-grid { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 24px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 8px; }
.site-footer p { color: var(--muted); margin: 0; }
.site-footer h3 { margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: var(--muted); margin: 7px 0; }
.footer-bottom { width: min(1120px, calc(100% - 32px)); margin: 28px auto 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
@media (min-width: 720px) {
  .section { padding: 76px 0; }
  .product-bento { grid-template-columns: 1.4fr .8fr; align-items: stretch; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .category-bento, .scenario-grid, .doc-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; position: static; flex-direction: row; align-items: center; padding: 0; background: transparent; border: 0; box-shadow: none; }
  .site-nav a { padding: 8px 12px; }
  .centered-hero { padding-top: 112px; }
  .feature-grid { grid-template-columns: repeat(4, 1fr); }
  .roadmap { grid-template-columns: repeat(6, 1fr); }
  .road-step:nth-child(even) { margin-top: 30px; }
  .category-bento { grid-template-columns: repeat(4, 1fr); }
  .category-card.big { grid-column: span 2; }
  .bento-grid { grid-template-columns: repeat(6, 1fr); }
  .bento-card.large { grid-column: span 3; min-height: 210px; }
  .bento-card.medium { grid-column: span 2; }
  .bento-card.small { grid-column: span 1; }
  .security-layout { grid-template-columns: 1fr .9fr; gap: 36px; }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 300px; }
  .article-body { padding: 34px; }
}