:root {
  color-scheme: dark;
  --bg: #0B1224;
  --card: #111B33;
  --text: #EEF4FF;
  --muted: #B8C4D9;
  --accent: #00D4FF;
  --border: #26344F;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.62;
  background: var(--bg);
  color: var(--text);
}
main {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 18px 64px;
}
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.lang a, .product-nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: .95rem;
}
.lang a[aria-current="page"], .product-nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
}
.lang a:focus-visible, .product-nav a:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.product-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 18px 42px rgba(0,0,0,.28);
}
h1, h2, h3 { line-height: 1.25; }
h1 { margin-top: 0; font-size: 2.1rem; }
h2 {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--accent);
  font-size: 1.25rem;
  scroll-margin-top: 16px;
}
h3 { margin-top: 22px; font-size: 1.05rem; color: var(--text); }
p, li { color: var(--muted); }
strong { color: var(--text); }
a { color: var(--accent); }
.toc {
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin: 18px 0;
}
.toc ol {
  margin: 8px 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
}
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 22px;
  overflow-x: auto;
  display: block;
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  color: var(--muted);
  min-width: 120px;
}
th {
  color: var(--text);
  background: rgba(255,255,255,.05);
}
.notice {
  background: rgba(0,212,255,.08);
  border: 1px solid rgba(0,212,255,.35);
  border-radius: 14px;
  padding: 14px 16px;
  margin: 18px 0;
}
.cta {
  display: inline-block;
  margin-top: 8px;
  padding: 12px 18px;
  border-radius: 12px;
  background: rgba(0,212,255,.14);
  border: 1px solid rgba(0,212,255,.4);
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.cta:hover { background: rgba(0,212,255,.22); }
.small { font-size: .95rem; }
@media (max-width: 640px) {
  h1 { font-size: 1.7rem; }
  .card { padding: 20px; }
  th, td { padding: 8px 10px; font-size: .92rem; }
}