:root {
  --bg: #f7f8f9;
  --surface: #ffffff;
  --text: #15191d;
  --muted: #5b6670;
  --line: #dde2e6;
  --accent: #0b7a75;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1013;
    --surface: #151a1f;
    --text: #e6eaed;
    --muted: #9aa5ae;
    --line: #262d33;
    --accent: #4fc3bb;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1013;
  --surface: #151a1f;
  --text: #e6eaed;
  --muted: #9aa5ae;
  --line: #262d33;
  --accent: #4fc3bb;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

header.top {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.top .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; min-height: 56px; flex-wrap: wrap;
}
.brand { font-weight: 650; color: var(--text); text-decoration: none; letter-spacing: .01em; }
nav.langs { display: flex; gap: 4px; }
nav.langs a {
  color: var(--muted); text-decoration: none; font-size: 14px;
  padding: 4px 10px; border-radius: 999px; border: 1px solid transparent;
}
nav.langs a[aria-current="true"] { color: var(--text); border-color: var(--line); background: var(--bg); }

main { padding: 32px 0 48px; }
article + article { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--line); }
html.js [data-lang]:not([data-shown]) { display: none; }
html.js article + article { margin-top: 0; padding-top: 0; border-top: 0; }

h1 { font-size: 28px; line-height: 1.25; margin: 0 0 6px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, ul, ol { margin: 8px 0; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 20px; }
a { color: var(--accent); }
.note {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 16px; margin: 16px 0;
}
.cards { display: grid; gap: 12px; margin-top: 20px; }
.cards a {
  display: block; background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; color: var(--text); text-decoration: none;
}
.cards a span { display: block; color: var(--muted); font-size: 14px; }

footer.bottom { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer.bottom .wrap { padding-top: 20px; padding-bottom: 32px; }
footer.bottom a { color: var(--muted); }