:root {
  --bg: #0f1321;
  --surface: #161b2e;
  --text: #eef2ff;
  --muted: #a3a8c3;
  --primary: #4f46e5;
  --primary-600: #4338ca;
  --card: #1b2140;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, var(--bg), #0b0e19 60%);
  color: var(--text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(15, 19, 33, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #222747;
}
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 700; letter-spacing: 0.3px; }
.lang-nav a { color: var(--muted); text-decoration: none; margin: 0 6px; }
.lang-nav a:hover { color: var(--text); }

.hero { text-align: center; padding: 56px 0 24px; }
.hero h1 { margin: 0 0 8px; font-size: 28px; }
.hero p { margin: 0; color: var(--muted); }

.card-grid { margin: 24px 0 40px; }
.card-grid h2 { font-size: 18px; color: var(--muted); font-weight: 600; }
.grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.card {
  display: block;
  background: var(--card);
  border: 1px solid #21274c;
  border-radius: 12px;
  padding: 16px;
  color: var(--text);
  text-decoration: none;
  transition: transform .15s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: 0 10px 30px rgba(79, 70, 229, 0.15);
}
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); }

.site-footer { border-top: 1px solid #222747; padding: 20px 0; color: var(--muted); }

.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 56px;
}
.doc h1 { margin-top: 24px; font-size: 28px; }
.doc h2 { margin-top: 28px; font-size: 20px; }
.doc p, .doc li { line-height: 1.6; color: #cbd0e8; }
.doc a { color: #a5b4fc; }
.doc .muted { color: var(--muted); }
.doc nav.breadcrumb a { color: var(--muted); text-decoration: none; }
.doc nav.breadcrumb span { color: var(--muted); margin: 0 6px; }

code { background: #11152a; padding: 0 4px; border-radius: 4px; }