:root {
  --primary: rgb(70,139,223);
  --primary-dark: rgb(38,96,174);
  --primary-soft: rgba(70,139,223,.12);
  --ink: #102033;
  --muted: #607086;
  --line: #dce8f7;
  --card: rgba(255,255,255,.86);
  --bg: #f6faff;
  --soft: #eef6ff;
  --radius: 24px;
  --shadow: 0 18px 60px rgba(32, 85, 154, .12);
}
* { 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 42%, #ffffff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { color: var(--muted); margin: 0 0 14px; }
h1, h2, h3 { line-height: 1.2; margin: 0; color: var(--ink); letter-spacing: -.03em; }
h1 { font-size: clamp(2.2rem, 8vw, 5rem); }
h2 { font-size: clamp(1.65rem, 4vw, 3rem); }
h3 { font-size: 1.08rem; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(150%) blur(18px);
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid rgba(220,232,247,.7);
}
.nav-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  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-img { width: 36px; height: 36px; border-radius: 12px; }
.brand-text { font-size: 1.02rem; }
.main-nav { display: none; align-items: center; gap: 6px; }
.main-nav a { padding: 8px 12px; border-radius: 999px; color: #526377; font-size: .94rem; transition: .2s ease; }
.main-nav a:hover, .main-nav a.is-active { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 14px; display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; padding: 0 10px; }
.nav-toggle span { display: block; height: 2px; border-radius: 2px; background: var(--ink); }
.main-nav.is-open { display: flex; position: absolute; left: 16px; right: 16px; top: 68px; flex-direction: column; align-items: stretch; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.main-nav.is-open a { padding: 12px 14px; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(820px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 64px 0; }
.section-head { margin-bottom: 28px; }
.section-head.center { text-align: center; max-width: 760px; margin-left: auto; margin-right: auto; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid rgba(70,139,223,.18);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: .84rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.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 12px 26px rgba(70,139,223,.26);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  border: 0;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 32px rgba(70,139,223,.32); }
.centered-hero { padding: 84px 0 40px; text-align: center; position: relative; }
.centered-hero:before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  height: 460px;
  background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 58%);
  pointer-events: none;
  z-index: -1;
}
.hero-copy { max-width: 880px; margin: 0 auto; }
.hero-copy p { max-width: 730px; margin: 18px auto 26px; font-size: 1.04rem; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 20px; }
.hero-tags span, .mini-tag { color: #375472; background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; font-size: .88rem; }
.product-bento {
  margin-top: 38px;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  align-items: stretch;
}
.product-main {
  min-height: 420px;
  border-radius: 30px;
  padding: 24px;
  background: linear-gradient(150deg, #ffffff, #eaf4ff);
  border: 1px solid rgba(70,139,223,.16);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.product-main:after {
  content: '';
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: rgba(70,139,223,.12);
  filter: blur(30px);
}
.app-visual { width: min(290px, 80%); position: relative; z-index: 1; filter: drop-shadow(0 24px 38px rgba(24,79,143,.18)); }
.status-card, .card, .category-card, .feature-card, .scenario-card, .faq-item, .principle-card, .doc-card {
  background: var(--card);
  border: 1px solid rgba(210,225,242,.88);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 12px 40px rgba(34,74,124,.07);
}
.status-card { display: flex; flex-direction: column; justify-content: center; min-height: 126px; }
.status-card strong { font-size: 1rem; }
.status-card small, .muted { color: var(--muted); }
.capability-grid, .scenario-grid, .faq-grid, .note-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
.card .icon-dot, .feature-card .icon-dot, .scenario-card .icon-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--primary); display: inline-block; box-shadow: 0 0 0 6px var(--primary-soft); margin-bottom: 18px; }
.roadmap { position: relative; display: grid; gap: 16px; }
.road-step {
  position: relative;
  padding: 22px 22px 22px 70px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 10px 30px rgba(34,74,124,.06);
}
.road-step:before { content: attr(data-step); position: absolute; left: 20px; top: 22px; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--primary); color: #fff; font-weight: 800; }
.road-step a, .text-link { color: var(--primary-dark); font-weight: 800; }
.category-bento { display: grid; grid-template-columns: 1fr; gap: 16px; }
.category-card { min-height: 150px; display: flex; flex-direction: column; justify-content: space-between; transition: .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.38); }
.category-card a { color: var(--primary-dark); font-weight: 800; }
.bento-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
.feature-card.large { background: linear-gradient(145deg, #ffffff, #eef7ff); }
.feature-card.small { min-height: 145px; }
.security-layout { display: grid; gap: 24px; align-items: center; }
.security-copy { padding: 6px; }
.principle-list { display: grid; gap: 12px; }
.principle-card { padding: 18px; display: flex; gap: 12px; align-items: flex-start; }
.principle-card span { flex: 0 0 auto; width: 28px; height: 28px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); border-radius: 10px; font-weight: 800; }
.scenario-card a { display: inline-flex; margin-top: 8px; color: var(--primary-dark); font-weight: 800; }
.faq-item details { display: block; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 10px; }
.cta-section { padding: 64px 0 80px; }
.cta-card { text-align: center; padding: 44px 24px; border-radius: 32px; background: linear-gradient(135deg, #eef7ff, #ffffff); border: 1px solid rgba(70,139,223,.18); box-shadow: var(--shadow); }
.cta-card p { max-width: 680px; margin: 14px auto 24px; }
.page-hero { padding: 60px 0 26px; background: radial-gradient(circle at 50% -20%, rgba(70,139,223,.15), transparent 52%); }
.page-hero .narrow, .page-hero .container { text-align: left; }
.page-hero h1 { font-size: clamp(2rem, 6vw, 4rem); max-width: 900px; }
.page-summary { font-size: 1.03rem; max-width: 760px; margin-top: 18px; }
.doc-layout { display: grid; gap: 22px; align-items: start; }
.article-body { background: rgba(255,255,255,.7); border: 1px solid rgba(220,232,247,.8); border-radius: 28px; padding: 24px; }
.article-body h2 { font-size: 1.45rem; margin: 28px 0 12px; }
.article-body h2:first-child { margin-top: 0; }
.article-body ul, .article-body ol { margin: 8px 0 18px; padding-left: 1.2rem; color: var(--muted); }
.article-body li { margin-bottom: 8px; }
.side-panel { display: grid; gap: 14px; }
.check-list { list-style: none; padding: 0 !important; }
.check-list li { padding-left: 30px; position: relative; }
.check-list li:before { content: '✓'; position: absolute; left: 0; top: 0; width: 20px; height: 20px; border-radius: 7px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); font-size: .78rem; font-weight: 900; }
.process-list { display: grid; gap: 12px; margin: 18px 0; }
.process-item { display: grid; grid-template-columns: 38px 1fr; gap: 12px; padding: 16px; border: 1px solid var(--line); background: #fff; border-radius: 18px; }
.process-item span { width: 38px; height: 38px; border-radius: 14px; display: grid; place-items: center; color: #fff; background: var(--primary); font-weight: 800; }
.doc-cta { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.about-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
.download-steps { counter-reset: step; display: grid; gap: 14px; margin-top: 24px; }
.download-step { counter-increment: step; padding: 18px 18px 18px 62px; border: 1px solid var(--line); border-radius: 20px; background: #fff; position: relative; }
.download-step:before { content: counter(step); position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; display: grid; place-items: center; background: var(--primary); color: #fff; border-radius: 11px; font-weight: 800; }
.site-footer { margin-top: 40px; border-top: 1px solid var(--line); background: #fff; }
.footer-inner { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 34px 0; display: grid; gap: 24px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; max-width: 520px; }
.footer-logo { width: 42px; height: 42px; border-radius: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { color: #526377; padding: 8px 10px; background: #f6faff; border-radius: 999px; }
.footer-bottom { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 18px 0 28px; color: #7a8797; font-size: .9rem; }
@media (min-width: 720px) {
  .section { padding: 78px 0; }
  .capability-grid, .scenario-grid, .faq-grid, .note-grid { grid-template-columns: repeat(2, 1fr); }
  .category-bento { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
  .article-body { padding: 34px; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .main-nav { display: flex; }
  .centered-hero { padding-top: 112px; }
  .product-bento { grid-template-columns: 1.55fr .85fr; grid-template-rows: repeat(4, minmax(90px, auto)); }
  .product-main { grid-row: span 4; min-height: 560px; }
  .status-card:nth-child(2) { transform: translateY(18px); }
  .status-card:nth-child(4) { transform: translateY(-12px); }
  .capability-grid { grid-template-columns: repeat(4, 1fr); }
  .roadmap { grid-template-columns: repeat(6, 1fr); gap: 12px; }
  .roadmap:before { content: ''; position: absolute; left: 6%; right: 6%; top: 39px; height: 2px; background: linear-gradient(90deg, transparent, var(--line), transparent); }
  .road-step { padding: 70px 16px 20px; min-height: 210px; }
  .road-step:before { left: 16px; top: 18px; }
  .road-step:nth-child(even) { transform: translateY(28px); }
  .category-bento { grid-template-columns: repeat(4, 1fr); }
  .category-card.featured { grid-column: span 2; min-height: 210px; }
  .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(168px, 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, 1fr); }
  .scenario-card:nth-child(1), .scenario-card:nth-child(2) { grid-column: span 2; }
  .scenario-card:nth-child(3) { grid-column: span 1; }
  .scenario-card:nth-child(4), .scenario-card:nth-child(5) { grid-column: span 2; }
  .faq-grid { grid-template-columns: repeat(2, 1fr); }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 310px; }
  .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}