:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0062cc;
  --line: #d2d2d7;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #4c9bff;
    --line: #38383a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 48px 16px 64px; }
header.app { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }
header.app img { width: 72px; height: 72px; border-radius: 16px; box-shadow: 0 4px 16px rgba(0, 0, 0, .15); }
header.app .title { font-size: 28px; font-weight: 700; line-height: 1.2; margin: 0; }
header.app .subtitle { color: var(--muted); margin: 2px 0 0; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 8px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
p, li { margin: 8px 0; }
ul { padding-left: 22px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font: 15px ui-monospace, "SF Mono", Menlo, monospace; word-break: break-all; }
.card { background: var(--card); border-radius: 18px; padding: 24px; margin: 20px 0; }
.muted { color: var(--muted); }
.links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.links a { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px; }
nav.top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 16px; margin-bottom: 32px; font-size: 15px; }
nav.top .brand { font-weight: 600; white-space: nowrap; }
nav.top .lang { display: flex; flex-wrap: wrap; gap: 4px 16px; }
nav.top .lang a { white-space: nowrap; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }