:root {
  color-scheme: dark;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  color: #dbe2ee;
  background: #0b0f19;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 6%, rgba(99, 102, 241, 0.16), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(45, 212, 191, 0.1), transparent 30rem), #0b0f19;
}

a {
  color: #a5b4fc;
  text-decoration: none;
}

a:hover {
  color: #c7d2fe;
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #f3f4f6;
  font-size: 19px;
  font-weight: 750;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.back-home {
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  color: #9ca3af;
  font-size: 13px;
  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
}

.back-home:hover {
  color: #e5e7eb;
  border-color: rgba(165, 180, 252, 0.5);
  background: rgba(255, 255, 255, 0.04);
}

.document {
  margin: 26px 0 48px;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 20px;
  background: rgba(17, 24, 39, 0.74);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(16px);
}

.document h1 {
  margin: 0;
  color: #f8fafc;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.2;
}

.lead {
  margin: 16px 0 0;
  color: #aab3c2;
  font-size: 16px;
  line-height: 1.85;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
  color: #6b7280;
  font-size: 13px;
}

.document hr {
  height: 1px;
  margin: 30px 0;
  border: 0;
  background: rgba(255, 255, 255, 0.08);
}

.document section + section {
  margin-top: 34px;
}

.document h2 {
  margin: 0 0 13px;
  color: #e8ecf4;
  font-size: 20px;
  line-height: 1.45;
}

.document h3 {
  margin: 22px 0 8px;
  color: #d5dbea;
  font-size: 16px;
}

.document p,
.document li {
  color: #aab3c2;
  font-size: 15px;
  line-height: 1.9;
}

.document p {
  margin: 10px 0;
}

.document ul,
.document ol {
  margin: 10px 0;
  padding-left: 24px;
}

.document li + li {
  margin-top: 6px;
}

.notice {
  margin: 20px 0;
  padding: 15px 17px;
  border-left: 3px solid #818cf8;
  border-radius: 0 10px 10px 0;
  background: rgba(99, 102, 241, 0.09);
  color: #bdc5d4;
  font-size: 14px;
  line-height: 1.8;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.card {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.025);
}

.card strong {
  display: block;
  margin-bottom: 7px;
  color: #e5e7eb;
  font-size: 15px;
}

.card p {
  margin: 0;
  font-size: 14px;
}

.site-footer {
  padding: 0 0 36px;
  color: #5f6877;
  font-size: 13px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 10px;
}

.footer-links a {
  color: #737d8d;
}

.footer-links a[aria-current="page"] {
  color: #a5b4fc;
}

.footer-icp {
  margin-top: 10px;
}

@media (max-width: 520px) {
  .site-header {
    padding: 18px 0;
  }

  .document {
    margin-top: 14px;
  }

  .back-home {
    padding: 7px 11px;
  }
}