:root {
  --primary: rgb(70,139,223);
  --primary-dark: #245fba;
  --primary-soft: #edf6ff;
  --ink: #11243d;
  --muted: #5d6b7e;
  --line: #dce9f8;
  --card: rgba(255,255,255,.88);
  --bg: #f7fbff;
  --shadow: 0 18px 55px rgba(45, 92, 152, .12);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(70,139,223,.15), transparent 34rem),
    linear-gradient(180deg, #ffffff 0%, #f7fbff 45%, #ffffff 100%);
  line-height: 1.75;
  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; }
.container.narrow { width: min(860px, calc(100% - 32px)); }
.section { padding: 58px 0; }
.section-head { margin-bottom: 26px; }
.section-kicker, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(70,139,223,.1);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.02em; }
h1 { font-size: clamp(34px, 8vw, 64px); }
h2 { font-size: clamp(25px, 5vw, 42px); }
h3 { font-size: 20px; }
p { margin: 12px 0 0; color: var(--muted); }
ul, ol { color: var(--muted); padding-left: 20px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(220,233,248,.8);
}
.nav-shell {
  width: min(1160px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand-logo { width: 34px; height: 34px; border-radius: 11px; }
.brand-text { letter-spacing: .02em; font-size: 18px; }
.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 10px;
}
.nav-toggle span { height: 2px; background: var(--ink); border-radius: 999px; }
.site-nav {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 72px;
  display: none;
  flex-direction: column;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
  padding: 12px 14px;
  border-radius: 14px;
  color: #41516a;
  font-size: 15px;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 30px rgba(70,139,223,.24);
  transition: transform .18s ease, box-shadow .18s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(70,139,223,.28); }

.centered-hero {
  padding: 78px 0 36px;
  text-align: center;
  background: linear-gradient(180deg, rgba(237,246,255,.82), rgba(255,255,255,0));
}
.hero-copy { max-width: 860px; margin: 0 auto; }
.hero-copy p { font-size: 17px; max-width: 760px; margin-left: auto; margin-right: auto; }
.hero-actions { margin-top: 24px; display: flex; justify-content: center; }
.trust-tags {
  margin: 18px auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.trust-tags span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.76);
  color: #3f5876;
  font-size: 13px;
}

.product-bento {
  display: grid;
  gap: 16px;
  align-items: stretch;
  margin-top: 26px;
}
.product-visual {
  position: relative;
  overflow: hidden;
  min-height: 390px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background:
    radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 44%),
    linear-gradient(145deg, #ffffff, #f2f8ff);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
}
.product-visual img { width: min(250px, 72vw); filter: drop-shadow(0 28px 38px rgba(33,70,115,.2)); }
.status-card, .metric-card, .category-card, .feature-card, .scenario-card, .faq-card, .principle-card, .tip-card, .doc-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 14px 40px rgba(45,92,152,.08);
}
.status-grid { display: grid; gap: 14px; }
.status-card { padding: 18px; }
.status-card small, .metric-card small { display: block; color: var(--primary-dark); font-weight: 800; margin-bottom: 5px; }
.status-card strong, .metric-card strong { display: block; font-size: 19px; }

.metric-grid { display: grid; gap: 14px; }
.metric-card { padding: 20px; }
.roadmap {
  position: relative;
  display: grid;
  gap: 16px;
}
.roadmap-step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.step-no {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 15px;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}
.step-link { display: inline-flex; margin-top: 10px; color: var(--primary-dark); font-weight: 800; }

.category-bento, .bento-grid, .scenario-grid, .faq-grid, .principle-grid, .guide-grid, .check-grid {
  display: grid;
  gap: 16px;
}
.category-card, .feature-card, .scenario-card, .faq-card, .principle-card, .tip-card, .doc-card { padding: 22px; }
.category-card a, .scenario-card a, .faq-card a { color: var(--primary-dark); font-weight: 800; display: inline-block; margin-top: 12px; }
.feature-card.large { background: linear-gradient(145deg, #fff, #eef7ff); }
.feature-card h3, .category-card h3, .scenario-card h3 { margin-bottom: 8px; }
.security-layout { display: grid; gap: 22px; align-items: start; }
.security-panel {
  padding: 24px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, #ffffff, #f0f8ff);
  box-shadow: var(--shadow);
}
.principle-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.principle-list li { padding: 12px 14px; border-radius: 16px; background: rgba(70,139,223,.08); color: #38526d; }

.cta-section {
  margin: 40px 0 70px;
  text-align: center;
}
.cta-card {
  padding: 34px 22px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: linear-gradient(135deg, #f2f8ff, #ffffff 58%, #edf6ff);
  box-shadow: var(--shadow);
}
.cta-card .download-btn { margin-top: 20px; }

.page-hero, .doc-hero {
  padding: 64px 0 34px;
  background: linear-gradient(180deg, rgba(237,246,255,.9), rgba(255,255,255,0));
}
.page-hero .container, .doc-hero .container { display: grid; gap: 18px; }
.doc-hero p { font-size: 17px; }
.doc-layout { display: grid; gap: 22px; align-items: start; }
.doc-content {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255,255,255,.86);
  box-shadow: 0 14px 42px rgba(45,92,152,.08);
}
.doc-content h2 { font-size: clamp(22px, 4vw, 30px); margin-top: 28px; }
.doc-content h2:first-child { margin-top: 0; }
.side-panel { display: grid; gap: 16px; }
.tip-card strong { display: block; margin-bottom: 8px; }
.process-list { display: grid; gap: 12px; margin-top: 18px; }
.process-item {
  padding: 16px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: #fff;
}
.process-item b { color: var(--primary-dark); }
.notice-box {
  margin-top: 18px;
  padding: 18px;
  border-radius: 20px;
  background: #f3f9ff;
  border: 1px solid var(--line);
  color: #3d536e;
}
.faq-list { display: grid; gap: 12px; }
details.faq-item {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  padding: 16px 18px;
}
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 10px; }
.download-steps { counter-reset: step; display: grid; gap: 14px; margin-top: 20px; }
.download-steps li {
  list-style: none;
  position: relative;
  padding: 16px 16px 16px 56px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}
.download-steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.site-footer { border-top: 1px solid var(--line); background: rgba(255,255,255,.8); padding-top: 42px; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; }
.footer-brand img { width: 30px; border-radius: 10px; }
.site-footer h3 { font-size: 15px; margin-bottom: 10px; }
.site-footer a { display: block; color: var(--muted); margin: 7px 0; }
.site-footer a:hover { color: var(--primary-dark); }
.footer-bottom { text-align: center; color: #7b8798; font-size: 13px; padding: 24px 14px; border-top: 1px solid var(--line); margin-top: 34px; }

@media (min-width: 680px) {
  .metric-grid, .scenario-grid, .faq-grid, .guide-grid, .check-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .category-bento { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .bento-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}

@media (min-width: 960px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; box-shadow: none; border: 0; background: transparent; gap: 2px; }
  .site-nav a { padding: 10px 12px; }
  .centered-hero { padding-top: 112px; }
  .product-bento { grid-template-columns: 1.4fr .8fr; }
  .product-visual { min-height: 520px; }
  .status-grid { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .roadmap { grid-template-columns: repeat(6, minmax(0,1fr)); }
  .roadmap-step { grid-template-columns: 1fr; }
  .roadmap-step:nth-child(even) { transform: translateY(22px); }
  .category-bento { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .category-card.wide { grid-column: span 2; }
  .bento-grid { grid-template-columns: repeat(4, minmax(0,1fr)); grid-auto-rows: minmax(170px, auto); }
  .feature-card.large { grid-column: span 2; grid-row: span 2; }
  .feature-card.medium { grid-column: span 2; }
  .security-layout { grid-template-columns: 1.05fr .95fr; }
  .scenario-grid { grid-template-columns: repeat(5, minmax(0,1fr)); }
  .faq-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 310px; }
  .doc-content { padding: 34px; }
}