*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #225fba;
  --primary-soft: #eaf4ff;
  --primary-softer: #f5f9ff;
  --ink: #15243a;
  --muted: #60708a;
  --line: #d9e6f5;
  --panel: #ffffff;
  --panel-blue: #f7fbff;
  --shadow: 0 14px 40px rgba(26, 79, 144, .08);
  --radius: 18px;
  --container: 1180px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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 10% 0%, rgba(70,139,223,.12), transparent 30%),
    linear-gradient(180deg, #f6fbff 0%, #ffffff 46%, #f7fbff 100%);
  line-height: 1.72;
  overflow-x: hidden;
}

a {
  color: var(--primary-dark);
  text-decoration: none;
}

a:hover {
  color: var(--primary);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(217,230,245,.85);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  min-height: 72px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: .02em;
  white-space: nowrap;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.brand-text {
  font-size: 17px;
}

.nav-check {
  display: none;
}

.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: #fff;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  border-radius: 10px;
  background: var(--ink);
}

.site-nav {
  position: absolute;
  left: 18px;
  right: 18px;
  top: 70px;
  display: none;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
}

.nav-check:checked ~ .site-nav {
  display: grid;
  gap: 6px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #37506e;
  font-weight: 650;
  font-size: 14px;
}

.site-nav a:hover,
.site-nav a.active {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.content-container,
.docs-hero,
.safety-strip,
.docs-layout,
.cta-section,
.page-hero,
.page-container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 18px;
  padding-right: 18px;
}

.docs-hero {
  padding-top: 38px;
  padding-bottom: 22px;
  display: grid;
  gap: 28px;
  align-items: center;
}

.eyebrow,
.doc-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 760;
  border: 1px solid rgba(70,139,223,.18);
}

.hero-copy h1,
.page-hero h1 {
  margin: 16px 0 14px;
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.12;
  letter-spacing: -.04em;
}

.hero-copy p,
.page-hero p,
.section-lead {
  color: var(--muted);
  font-size: 16px;
  margin: 0 0 22px;
}

.hero-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.hero-tags span,
.meta-tag {
  padding: 7px 11px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  color: #45617f;
  font-size: 13px;
  font-weight: 650;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: 0 12px 30px rgba(70,139,223,.23);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  border: 0;
  cursor: pointer;
}

.download-btn:hover {
  color: #fff;
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 16px 36px rgba(70,139,223,.28);
}

.hero-visual {
  position: relative;
  min-height: 430px;
  border: 1px solid rgba(217,230,245,.95);
  border-radius: 28px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.92), rgba(234,244,255,.92)),
    radial-gradient(circle at 70% 15%, rgba(70,139,223,.16), transparent 42%);
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: 18px;
  display: grid;
  align-items: center;
}

.hero-app {
  width: min(270px, 76vw);
  margin: 0 auto;
  filter: drop-shadow(0 24px 36px rgba(28, 72, 130, .18));
}

.status-card {
  position: relative;
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.status-card .mini-card {
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px 14px;
  box-shadow: 0 10px 28px rgba(28, 72, 130, .06);
}

.mini-card strong {
  display: block;
  margin-bottom: 2px;
  color: #203856;
}

.mini-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.safety-strip {
  margin-top: 10px;
  margin-bottom: 34px;
}

.safety-strip-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px;
  border-radius: 18px;
  background: var(--primary-soft);
  border: 1px solid rgba(70,139,223,.16);
}

.safety-strip span {
  flex: 1 1 210px;
  color: #315277;
  font-weight: 650;
  font-size: 14px;
}

.docs-layout {
  display: grid;
  gap: 24px;
  padding-top: 8px;
  padding-bottom: 46px;
}

.docs-sidebar {
  background: rgba(255,255,255,.88);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}

.docs-sidebar strong {
  display: block;
  padding: 0 4px 10px;
  font-size: 15px;
}

.docs-sidebar nav {
  display: grid;
  gap: 8px;
}

.docs-sidebar a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: #425b78;
  background: var(--primary-softer);
  font-weight: 650;
}

.docs-sidebar a:hover {
  background: var(--primary-soft);
}

.docs-main {
  display: grid;
  gap: 28px;
}

.doc-section {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 12px 32px rgba(28, 72, 130, .055);
}

.doc-section h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 4vw, 34px);
  letter-spacing: -.025em;
}

.doc-section h3 {
  margin: 20px 0 8px;
  font-size: 20px;
}

.doc-section p {
  color: var(--muted);
}

.note-box,
.tip-box,
.warning-box,
.security-panel {
  border-radius: 16px;
  padding: 15px 16px;
  margin: 16px 0;
  background: var(--primary-softer);
  border-left: 4px solid var(--primary);
  color: #37506e;
}

.warning-box {
  background: #fff9ed;
  border-left-color: #e2a03a;
}

.docs-steps {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.step-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, #fff, #f8fbff);
}

.step-no,
.principle-no {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--primary);
  color: #fff;
  font-weight: 850;
}

.step-item h3,
.category-card h3,
.feature-card h3,
.risk-item h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.step-item p,
.category-card p,
.feature-card p,
.risk-item p {
  margin: 0 0 8px;
  color: var(--muted);
}

.docs-category-grid,
.feature-grid,
.risk-grid,
.faq-grid,
.check-grid {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.category-card,
.document-card,
.feature-card,
.risk-item,
.faq-item,
.check-item {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: #fff;
}

.category-card {
  min-height: 160px;
}

.category-card a,
.step-item a,
.risk-item a,
.inline-link {
  font-weight: 780;
}

.principle-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.principle-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px;
  border-radius: 18px;
  background: var(--primary-softer);
  border: 1px solid var(--line);
}

.principle-item h3 {
  margin: 0 0 4px;
}

.principle-item p {
  margin: 0;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.cta-section {
  padding-top: 12px;
  padding-bottom: 62px;
}

.cta-panel {
  text-align: center;
  padding: 34px 20px;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.95)),
    #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.cta-panel h2 {
  margin: 0 0 10px;
  font-size: clamp(26px, 5vw, 40px);
}

.cta-panel p {
  max-width: 720px;
  margin: 0 auto 22px;
  color: var(--muted);
}

.page-hero {
  padding-top: 36px;
  padding-bottom: 18px;
}

.page-hero h1 {
  font-size: clamp(30px, 6vw, 48px);
  max-width: 850px;
}

.page-container {
  padding-top: 10px;
  padding-bottom: 56px;
}

.article-layout {
  display: grid;
  gap: 24px;
}

.article-main {
  min-width: 0;
  background: rgba(255,255,255,.94);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 12px 32px rgba(28, 72, 130, .055);
}

.article-main h2 {
  margin-top: 28px;
  margin-bottom: 10px;
  font-size: 24px;
}

.article-main h2:first-child {
  margin-top: 0;
}

.article-main p,
.article-main li {
  color: var(--muted);
}

.article-main ul,
.article-main ol {
  padding-left: 22px;
}

.article-aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.aside-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: #fff;
}

.aside-card h3 {
  margin: 0 0 10px;
}

.aside-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.download-single {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.process-list {
  counter-reset: process;
  display: grid;
  gap: 12px;
  padding: 0;
  list-style: none;
}

.process-list li {
  counter-increment: process;
  position: relative;
  padding: 14px 14px 14px 58px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--primary-softer);
}

.process-list li::before {
  content: counter(process);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 30px;
  height: 30px;
  border-radius: 11px;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 850;
}

.site-footer {
  background: #eef6ff;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 26px 18px;
  display: grid;
  gap: 20px;
}

.footer-brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.footer-brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
}

.footer-brand p {
  margin: 4px 0 0;
  color: var(--muted);
  max-width: 560px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-links a {
  padding: 8px 10px;
  border-radius: 12px;
  background: #fff;
  color: #425b78;
  font-weight: 650;
}

.footer-bottom {
  border-top: 1px solid rgba(217,230,245,.95);
  text-align: center;
  color: var(--muted);
  padding: 14px 18px 22px;
  font-size: 13px;
}

@media (min-width: 720px) {
  .docs-category-grid,
  .feature-grid,
  .risk-grid,
  .faq-grid,
  .check-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: 1.2fr .8fr;
    align-items: center;
  }

  .footer-links {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
    gap: 4px;
  }

  .site-nav a {
    padding: 9px 11px;
  }

  .docs-hero {
    grid-template-columns: 1.02fr .98fr;
    padding-top: 62px;
    padding-bottom: 26px;
  }

  .hero-visual {
    min-height: 520px;
    padding: 26px;
  }

  .status-card {
    position: absolute;
    right: 22px;
    bottom: 22px;
    width: min(340px, 80%);
  }

  .docs-layout {
    grid-template-columns: 250px 1fr;
    align-items: start;
  }

  .docs-sidebar {
    position: sticky;
    top: 94px;
  }

  .doc-section {
    padding: 30px;
  }

  .docs-category-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .feature-grid,
  .risk-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .article-main {
    padding: 30px;
  }

  .article-aside {
    position: sticky;
    top: 94px;
  }
}

@media (max-width: 420px) {
  .download-btn {
    width: 100%;
  }

  .hero-tags span,
  .meta-tag {
    width: 100%;
  }

  .step-item,
  .principle-item {
    grid-template-columns: 1fr;
  }

  .step-no,
  .principle-no {
    width: 38px;
    height: 38px;
  }
}