:root {
  --bg: #0b0f14;
  --card: #121922;
  --text: #e6edf3;
  --muted: #9fb0c0;
  --accent: #3ea6ff;
  --accent-2: #7bd389;
  --danger: #ff6b6b;
  --maxw: 920px;
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0; font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: #f6f8fb; color: #0a0d14;
}
@media (prefers-color-scheme: dark) {
  body { background: var(--bg); color: var(--text); }
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 24px; }
header.nav {
  border-bottom: 1px solid rgba(127,127,127,.2);
  position: sticky; top: 0; backdrop-filter: blur(6px);
  background: rgba(246,248,251,.8);
}
@media (prefers-color-scheme: dark) {
  header.nav { background: rgba(11,15,20,.7); }
}
.nav .brand { font-weight: 700; letter-spacing: .2px; }
.nav .links { display: flex; gap: 16px; flex-wrap: wrap; }
.nav a { color: var(--accent); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--accent-2); font-weight: 600; }

.hero { padding: 32px 0 8px; }
.hero h1 { margin: 0 0 8px; font-size: clamp(24px, 3.5vw, 36px); }
.hero p { margin: 0; color: var(--muted); }

.card { background: white; border-radius: 12px; padding: 20px; box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 32px rgba(0,0,0,.06); }
@media (prefers-color-scheme: dark) {
  .card { background: var(--card); box-shadow: 0 1px 2px rgba(0,0,0,.2), 0 8px 32px rgba(0,0,0,.3); }
}
.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 880px) { .grid { grid-template-columns: 1fr 1fr; } }

h2 { margin: 28px 0 12px; font-size: 20px; }
ul { margin: 10px 0 0 20px; }
li { margin: 4px 0; }
code { padding: 2px 6px; border-radius: 6px; background: rgba(127,127,127,.18); }

.note { padding: 10px 12px; border-radius: 8px; background: rgba(62, 166, 255, .12); color: var(--text); border: 1px solid rgba(62, 166, 255, .35); }
.danger { background: rgba(255,107,107,.12); border-color: rgba(255,107,107,.5); }
.footer { margin: 32px 0 24px; color: var(--muted); font-size: 14px; }

.lang { display: inline-flex; gap: 10px; font-size: 14px; }
.lang b { color: var(--muted); }