:root {
  --primary: rgb(70,139,223);
  --primary-dark: #245fa8;
  --primary-soft: #eaf3ff;
  --primary-light: #f5f9ff;
  --ink: #162033;
  --muted: #5f6e84;
  --line: #dce7f5;
  --panel: #ffffff;
  --bg: #f7fbff;
  --shadow: 0 14px 35px rgba(43, 93, 155, .08);
  --radius: 18px;
}

* { 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: linear-gradient(180deg, #f7fbff 0%, #ffffff 36%, #f8fbff 100%);
  line-height: 1.72;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 14px; color: var(--muted); }
h1, h2, h3 { margin: 0; line-height: 1.25; color: var(--ink); }
h1 { font-size: clamp(2rem, 8vw, 4.25rem); letter-spacing: -0.04em; }
h2 { font-size: clamp(1.45rem, 4vw, 2.25rem); margin-bottom: 18px; }
h3 { font-size: 1.08rem; margin-bottom: 10px; }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(220,231,245,.85);
}
.header-inner, .container, .footer-inner {
  width: min(100% - 32px, 1180px);
  margin: 0 auto;
}
.header-inner {
  min-height: 68px;
  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; }
.brand-logo { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { font-size: 1.18rem; color: #11213a; }
.nav-toggle { display: none; }
.nav-toggle-label {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: grid;
  align-content: center;
  gap: 5px;
  padding: 10px;
  cursor: pointer;
  background: white;
}
.nav-toggle-label span { display: block; height: 2px; background: var(--primary); border-radius: 99px; }
.main-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
  box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav { display: flex; }
.main-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #41516b;
  font-weight: 650;
  font-size: .95rem;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: var(--primary-soft); }

.docs-hero {
  width: min(100% - 32px, 1180px);
  margin: 26px auto 22px;
  display: grid;
  gap: 24px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 15% 20%, rgba(70,139,223,.18), transparent 32%),
    linear-gradient(135deg, #ffffff 0%, #f2f8ff 100%);
  box-shadow: var(--shadow);
}
.hero-copy { display: flex; flex-direction: column; justify-content: center; }
.eyebrow, .doc-badge {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid rgba(70,139,223,.2);
  border-radius: 999px;
  background: rgba(70,139,223,.08);
  color: var(--primary-dark);
  font-size: .82rem;
  font-weight: 750;
  margin-bottom: 14px;
}
.hero-copy p { font-size: 1.04rem; max-width: 650px; margin-top: 18px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.74);
  color: #36506e;
  font-size: .88rem;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 46px;
  margin-top: 24px;
  padding: 0 22px;
  border-radius: 14px;
  background: var(--primary);
  color: white;
  font-weight: 800;
  box-shadow: 0 12px 26px rgba(70,139,223,.25);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); box-shadow: 0 14px 28px rgba(70,139,223,.32); }
.hero-device {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid rgba(70,139,223,.14);
  border-radius: 24px;
  background: rgba(255,255,255,.78);
}
.app-frame {
  min-height: 260px;
  display: grid;
  place-items: center;
  border-radius: 24px;
  background: linear-gradient(160deg, #ecf6ff, #ffffff);
  overflow: hidden;
}
.app-frame img { width: min(72%, 280px); }
.status-card, .mini-card, .security-panel {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
}
.status-card strong, .mini-card strong { display: block; color: #1b3151; margin-bottom: 4px; }
.status-card p, .mini-card p { margin: 0; font-size: .92rem; }

.safety-strip {
  width: min(100% - 32px, 1180px);
  margin: 0 auto 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px;
  border: 1px solid rgba(70,139,223,.14);
  border-radius: 18px;
  background: var(--primary-soft);
}
.safety-strip span {
  flex: 1 1 240px;
  padding: 8px 10px;
  color: #284669;
  font-size: .94rem;
}

.section { padding: 36px 0; }
.section-header { margin-bottom: 20px; }
.section-header p { max-width: 820px; }
.docs-layout {
  width: min(100% - 32px, 1180px);
  margin: 0 auto;
  display: grid;
  gap: 22px;
}
.docs-sidebar {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: white;
  box-shadow: var(--shadow);
}
.docs-sidebar strong { display: block; margin: 2px 8px 10px; color: #1d3353; }
.docs-sidebar a {
  display: block;
  padding: 10px 12px;
  margin: 3px 0;
  border-radius: 12px;
  color: #4a5c74;
  font-size: .94rem;
}
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { min-width: 0; }
.doc-section {
  padding: 22px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: white;
  box-shadow: var(--shadow);
}
.doc-section h2 { display: flex; align-items: center; gap: 10px; }
.num {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: .9rem;
  flex: 0 0 auto;
}

.docs-steps { display: grid; gap: 12px; }
.step-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfdff;
}
.step-no {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  font-weight: 800;
}
.step-item p { margin-bottom: 8px; }
.text-link, .doc-link { color: var(--primary-dark); font-weight: 750; }
.text-link:hover, .doc-link:hover { text-decoration: underline; }
.docs-category-grid, .risk-grid, .feature-grid, .faq-grid {
  display: grid;
  gap: 14px;
}
.category-card, .risk-item, .feature-card, .faq-item, .guide-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.category-card { transition: border-color .2s ease, transform .2s ease; }
.category-card:hover { border-color: rgba(70,139,223,.45); transform: translateY(-2px); }
.category-card p, .feature-card p, .risk-item p, .faq-item p { margin-bottom: 10px; }
.principle-list { display: grid; gap: 12px; }
.principle-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, #fff, #f8fbff);
}
.principle-index {
  min-width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 900;
}
.notice, .tip-box, .check-card {
  border-left: 4px solid var(--primary);
  border-radius: 16px;
  background: var(--primary-soft);
  padding: 16px;
  color: #2f4b6f;
}
.notice strong, .tip-box strong, .check-card strong { color: #18365c; }
.article-notice { margin-top: 18px; }
.cta-section {
  width: min(100% - 32px, 1180px);
  margin: 20px auto 52px;
  padding: 30px;
  text-align: center;
  border: 1px solid rgba(70,139,223,.18);
  border-radius: 28px;
  background: linear-gradient(135deg, #f0f7ff, #ffffff);
  box-shadow: var(--shadow);
}
.cta-section .download-btn { margin-left: auto; margin-right: auto; }

.page-hero {
  width: min(100% - 32px, 1040px);
  margin: 26px auto 18px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(135deg, #ffffff, #f1f7ff);
  box-shadow: var(--shadow);
}
.page-hero h1 { font-size: clamp(1.9rem, 7vw, 3.3rem); }
.page-hero p { max-width: 780px; margin-top: 14px; }
.doc-page-layout {
  width: min(100% - 32px, 1040px);
  margin: 0 auto 52px;
  display: grid;
  gap: 20px;
}
.article-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: white;
  box-shadow: var(--shadow);
}
.article-panel h2 { margin-top: 28px; }
.article-panel h2:first-child { margin-top: 0; }
.side-panel { display: grid; gap: 14px; align-content: start; }
.side-box {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
}
.check-list { display: grid; gap: 10px; margin: 12px 0 0; padding: 0; list-style: none; }
.check-list li {
  padding: 10px 12px;
  border-radius: 12px;
  background: #f7fbff;
  color: #465d79;
}
.info-table { width: 100%; border-collapse: collapse; margin-top: 12px; overflow: hidden; border-radius: 14px; }
.info-table th, .info-table td { border: 1px solid var(--line); padding: 12px; text-align: left; vertical-align: top; }
.info-table th { background: var(--primary-soft); color: #27486d; }
.faq-list { display: grid; gap: 14px; }
.faq-list details {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
}
.faq-list summary { cursor: pointer; font-weight: 800; color: #243b5b; }
.faq-list p { margin-top: 12px; }

.site-footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
}
.footer-inner { padding: 28px 0; display: grid; gap: 18px; }
.footer-brand { display: flex; gap: 14px; align-items: center; }
.footer-logo { width: 42px; height: 42px; border-radius: 13px; }
.footer-brand p { margin: 4px 0 0; font-size: .92rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { padding: 8px 10px; border-radius: 10px; color: #50637b; background: #f6f9fd; }
.footer-bottom { padding: 14px 16px; text-align: center; border-top: 1px solid var(--line); color: #718096; font-size: .88rem; }

@media (min-width: 700px) {
  .docs-category-grid, .feature-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .nav-toggle-label { display: none; }
  .main-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }
  .docs-hero { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); padding: 44px; }
  .docs-layout { grid-template-columns: 250px minmax(0, 1fr); align-items: start; }
  .docs-sidebar { position: sticky; top: 92px; }
  .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .doc-page-layout { grid-template-columns: minmax(0, 1fr) 280px; align-items: start; }
  .side-panel { position: sticky; top: 92px; }
  .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}

@media (max-width: 520px) {
  .header-inner, .container, .footer-inner, .docs-hero, .docs-layout, .safety-strip, .cta-section, .page-hero, .doc-page-layout { width: min(100% - 24px, 1180px); }
  .docs-hero, .page-hero, .article-panel, .doc-section, .cta-section { padding: 20px; border-radius: 22px; }
  .download-btn { width: 100%; min-height: 50px; }
  .step-item, .principle-item { grid-template-columns: 1fr; }
  .app-frame { min-height: 220px; }
}