:root {
  --brand: #4361ee;
  --brand-dark: #3651d4;
  --brand-soft: #eef1ff;
  --text: #1a1d26;
  --text-muted: #5c6370;
  --bg: #f7f8fc;
  --card: #ffffff;
  --border: #e4e8f0;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(67, 97, 238, 0.08);
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  pointer-events: none;
  cursor: default;
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 252, 0.88);
  border-bottom: 1px solid rgba(228, 232, 240, 0.8);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), #5b7cfa);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 18px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--brand);
  text-decoration: none;
}

.hero {
  padding: 72px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 28px;
  font-size: 18px;
  color: var(--text-muted);
  max-width: 34em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: default;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-secondary {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}

.hero-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero-card h2 {
  margin: 0 0 16px;
  font-size: 18px;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.feature-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
}

.feature-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--brand-soft);
  color: var(--brand);
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
}

.feature-list strong {
  display: block;
  margin-bottom: 2px;
}

.feature-list span {
  color: var(--text-muted);
  font-size: 14px;
}

.section {
  padding: 24px 0 72px;
}

.section-title {
  margin: 0 0 12px;
  font-size: 28px;
}

.section-desc {
  margin: 0 0 32px;
  color: var(--text-muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

.platform {
  margin-top: 40px;
  padding: 28px;
  border-radius: 20px;
  background: linear-gradient(135deg, #eef1ff, #f8f9ff);
  border: 1px solid #d8e0ff;
}

.platform h3 {
  margin: 0 0 8px;
}

.platform p {
  margin: 0;
  color: var(--text-muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 32px 0 40px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  font-size: 14px;
}

.footer-meta {
  color: var(--text-muted);
  font-size: 13px;
}

.footer-meta p {
  margin: 0 0 6px;
}

.footer-beian {
  margin: 0 0 6px;
  color: var(--text-muted);
}

.footer-beian img {
  vertical-align: middle;
  margin-right: 4px;
}

.footer-contact {
  margin: 0;
  color: var(--text-muted);
}

.doc-section {
  padding-top: 0;
}

.doc-section .doc-shell h3 {
  margin: 24px 0 10px;
  font-size: 17px;
}

.doc-page {
  padding: 48px 0 72px;
}

.doc-shell {
  max-width: 760px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  box-shadow: var(--shadow);
}

.doc-shell h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.doc-date {
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 14px;
}

.doc-shell h2 {
  margin: 28px 0 12px;
  font-size: 18px;
}

.doc-shell p {
  margin: 0 0 12px;
  color: var(--text);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .doc-shell {
    padding: 28px 20px;
  }
}