:root {
  --primary: rgb(70,139,223);
  --primary-dark: rgb(38, 92, 169);
  --primary-soft: rgba(70,139,223,.12);
  --bg: #f6f9ff;
  --panel: #ffffff;
  --panel-soft: #f1f7ff;
  --text: #0f1d2f;
  --muted: #5e6d82;
  --line: #dce8f6;
  --shadow: 0 18px 48px rgba(43, 88, 146, .10);
  --radius: 24px;
  --radius-sm: 16px;
  --max: 1160px;
}
* { 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(--text);
  background: linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #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: 40;
  backdrop-filter: blur(18px);
  background: rgba(255,255,255,.86);
  border-bottom: 1px solid rgba(220,232,246,.75);
}
.nav-wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -.02em;
}
.logo { width: 34px; height: 34px; border-radius: 12px; }
.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 14px;
  width: 44px;
  height: 44px;
  font-size: 22px;
  cursor: pointer;
}
.site-nav {
  position: absolute;
  top: 72px;
  left: 16px;
  right: 16px;
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255,255,255,.96);
  box-shadow: var(--shadow);
}
.site-nav.open { display: flex; }
.site-nav a {
  padding: 11px 14px;
  border-radius: 12px;
  color: #263a54;
  font-size: 15px;
}
.site-nav a:hover, .site-nav a.active { background: var(--primary-soft); color: var(--primary-dark); }
.section, .page-hero, .centered-hero, .doc-shell { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }
.centered-hero {
  padding: 76px 0 30px;
  text-align: center;
}
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 13px;
}
.centered-hero h1, .page-hero h1, .doc-header h1 {
  margin: 18px auto 16px;
  max-width: 900px;
  font-size: clamp(34px, 8vw, 72px);
  line-height: 1.05;
  letter-spacing: -.06em;
}
.lead {
  margin: 0 auto;
  max-width: 760px;
  color: var(--muted);
  font-size: 17px;
}
.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 14px 28px rgba(70,139,223,.25);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 36px rgba(70,139,223,.28); }
.hero-actions { margin-top: 28px; display: flex; justify-content: center; }
.security-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 18px auto 0;
}
.security-tags span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.78);
  color: #52657e;
  font-size: 14px;
}
.section { padding: 44px 0; }
.section-head { margin-bottom: 22px; display: grid; gap: 8px; }
.section-head h2, .cta-section h2, .security-copy h2 { margin: 0; font-size: clamp(26px, 5vw, 42px); line-height: 1.15; letter-spacing: -.035em; }
.section-head p, .cta-section p, .security-copy p { margin: 0; color: var(--muted); max-width: 720px; }
.product-bento {
  width: min(var(--max), calc(100% - 32px));
  margin: 18px auto 0;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
.product-main {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 46%), linear-gradient(180deg, #fff, #eef6ff);
  padding: 22px;
  min-height: 460px;
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
}
.product-main:before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 28px;
  border: 1px solid rgba(70,139,223,.10);
  pointer-events: none;
}
.app-shot {
  width: min(340px, 78vw);
  border-radius: 36px;
  filter: drop-shadow(0 24px 34px rgba(32,70,120,.22));
}
.status-card, .feature-card, .category-card, .scenario-card, .faq-item, .principle-card, .doc-card, .step-card {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.88);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(43, 88, 146, .07);
}
.status-stack { display: grid; gap: 16px; }
.status-card { padding: 18px; }
.status-card strong { display: block; margin-bottom: 6px; font-size: 16px; }
.status-card p { margin: 0; color: var(--muted); font-size: 14px; }
.status-dot { width: 10px; height: 10px; display: inline-block; border-radius: 999px; background: var(--primary); box-shadow: 0 0 0 6px var(--primary-soft); margin-right: 8px; }
.capability-grid, .scenario-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.feature-card { padding: 22px; }
.feature-card h3, .category-card h3, .scenario-card h3, .doc-card h3, .step-card h3 { margin: 0 0 8px; font-size: 20px; letter-spacing: -.015em; }
.feature-card p, .category-card p, .scenario-card p, .doc-card p, .step-card p { margin: 0; color: var(--muted); }
.card-link { display: inline-flex; margin-top: 12px; color: var(--primary-dark); font-weight: 800; }
.roadmap {
  display: grid;
  gap: 14px;
  counter-reset: step;
}
.roadmap-step {
  position: relative;
  padding: 20px 20px 20px 74px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 10px 26px rgba(43,88,146,.06);
}
.roadmap-step:before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}
.roadmap-step h3 { margin: 0 0 6px; font-size: 18px; }
.roadmap-step p { margin: 0; color: var(--muted); }
.category-bento, .bento-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.category-card { padding: 22px; position: relative; overflow: hidden; }
.category-card.large { background: linear-gradient(135deg, #fff, #eef6ff); }
.category-card:after {
  content: "";
  position: absolute;
  right: -42px;
  top: -42px;
  width: 110px;
  height: 110px;
  border-radius: 999px;
  background: var(--primary-soft);
}
.bento-grid .feature-card.big { min-height: 230px; background: linear-gradient(145deg, #fff, #eef6ff); }
.bento-grid .feature-card.medium { min-height: 190px; }
.bento-grid .feature-card.small { min-height: 150px; }
.security-layout {
  display: grid;
  gap: 18px;
  align-items: center;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: linear-gradient(135deg, #fff, #f1f7ff);
  box-shadow: var(--shadow);
}
.principles { display: grid; gap: 12px; }
.principle-card { padding: 16px; }
.principle-card strong { display: block; margin-bottom: 4px; }
.principle-card span { color: var(--muted); }
.scenario-card { padding: 20px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
  width: min(var(--max), calc(100% - 32px));
  margin: 42px auto 62px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 34px;
  background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.16), transparent 44%), linear-gradient(180deg, #fff, #eef6ff);
  padding: 38px 18px;
  box-shadow: var(--shadow);
}
.cta-section p { margin: 12px auto 24px; }
.page-hero { padding: 58px 0 22px; text-align: center; }
.page-hero h1 { font-size: clamp(32px, 7vw, 58px); }
.page-panel {
  width: min(940px, calc(100% - 32px));
  margin: 18px auto 56px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(255,255,255,.9);
  box-shadow: var(--shadow);
}
.page-panel p { color: var(--muted); }
.steps-list { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.steps-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px;
  border-radius: 18px;
  background: var(--panel-soft);
}
.steps-list b {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
}
.notice {
  margin-top: 20px;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid rgba(70,139,223,.22);
  background: rgba(70,139,223,.08);
  color: #334a66;
}
.doc-shell { padding: 54px 0 58px; }
.doc-header { max-width: 860px; margin-bottom: 22px; }
.doc-header h1 { font-size: clamp(31px, 7vw, 54px); margin-left: 0; }
.doc-summary { max-width: 760px; color: var(--muted); margin: 0; }
.doc-layout { display: grid; gap: 18px; align-items: start; }
.doc-main, .doc-side {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.92);
  border-radius: 28px;
  box-shadow: var(--shadow);
}
.doc-main { padding: 24px; }
.doc-main p { color: var(--muted); }
.doc-main h2 { margin-top: 28px; font-size: 25px; letter-spacing: -.02em; }
.doc-side { padding: 20px; }
.doc-card { padding: 18px; margin-bottom: 14px; box-shadow: none; background: #fff; }
.check-list { padding: 0; margin: 18px 0; list-style: none; display: grid; gap: 10px; }
.check-list li {
  padding: 13px 14px 13px 38px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  position: relative;
}
.check-list li:before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--primary-dark);
  font-weight: 900;
}
.step-cards { display: grid; gap: 12px; margin: 20px 0; }
.step-card { padding: 18px; }
.inline-cta { margin-top: 22px; }
.about-grid { display: grid; gap: 14px; margin-top: 20px; }
.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 34px 0 22px;
}
.footer-grid {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  gap: 24px;
}
.footer-grid p { color: var(--muted); margin: 12px 0 0; }
.footer-grid h3 { margin: 0 0 10px; font-size: 15px; }
.footer-grid a:not(.footer-brand) { display: block; color: var(--muted); margin: 7px 0; }
.footer-brand img { width: 30px; height: 30px; border-radius: 10px; }
.footer-bottom {
  width: min(var(--max), calc(100% - 32px));
  margin: 28px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #718096;
  font-size: 13px;
}
@media (min-width: 720px) {
  .capability-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .category-bento { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
  .page-panel { padding: 34px; }
  .doc-main { padding: 34px; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    box-shadow: none;
    border: 0;
    padding: 0;
    background: transparent;
  }
  .site-nav a { padding: 9px 12px; }
  .centered-hero { padding: 104px 0 42px; }
  .product-bento { grid-template-columns: minmax(0, 1.6fr) minmax(260px, .7fr); align-items: stretch; gap: 18px; }
  .product-main { min-height: 560px; }
  .status-stack { grid-template-rows: repeat(4, 1fr); }
  .capability-grid { grid-template-columns: repeat(4, 1fr); }
  .roadmap { grid-template-columns: repeat(6, 1fr); align-items: stretch; }
  .roadmap-step { padding: 70px 16px 18px; min-height: 230px; }
  .roadmap-step:before { left: 16px; top: 18px; }
  .roadmap-step:nth-child(even) { transform: translateY(22px); }
  .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(170px, auto); }
  .category-card.large { grid-column: span 2; }
  .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
  .bento-grid .big { grid-column: span 2; grid-row: span 2; }
  .bento-grid .medium { grid-column: span 2; }
  .security-layout { grid-template-columns: 1.08fr .92fr; padding: 38px; }
  .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; }
  .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
  .doc-side { position: sticky; top: 98px; }
  .step-cards { grid-template-columns: repeat(2, 1fr); }
}