:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --text: #1c1b19;
  --muted: #5f5b55;
  --line: #e7e3dd;
  --accent: #0f766e;
  --accent-soft: #e6f4f2;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141412;
    --surface: #1c1c1a;
    --text: #eceae6;
    --muted: #a5a19a;
    --line: #2e2d2a;
    --accent: #5eead4;
    --accent-soft: #15302d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 20px 0; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav.lang { display: flex; gap: 6px; font-size: 14px; }
nav.lang a { padding: 4px 8px; border-radius: 6px; text-decoration: none; color: var(--muted); }
nav.lang a[aria-current="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.hero { padding: 56px 0 24px; }
.hero h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p { color: var(--muted); font-size: 19px; margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; padding: 24px 0 8px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.card h2 { font-size: 16px; margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; padding: 24px 0 48px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 8px; text-decoration: none; font-weight: 600; }
.btn.primary { background: var(--accent); color: var(--bg); }
.btn.ghost { border: 1px solid var(--line); color: var(--text); }
article.doc { padding: 40px 0 24px; }
article.doc h1 { font-size: clamp(26px, 4.5vw, 34px); line-height: 1.2; margin: 0 0 6px; }
article.doc .meta { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
article.doc h2 { font-size: 20px; margin: 32px 0 8px; }
article.doc ul { padding-left: 22px; }
article.doc li { margin: 4px 0; }
.note { background: var(--accent-soft); border-radius: 10px; padding: 14px 16px; }
footer.bottom { border-top: 1px solid var(--line); padding: 20px 0 32px; color: var(--muted); font-size: 14px; }
footer.bottom a { color: var(--muted); }