:root {
  --bg: #ffffff;
  --text: #1f2933;
  --muted: #5f6b7a;
  --accent: #1d6b52;
  --border: #e3e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181c;
    --text: #e6e9ec;
    --muted: #9aa5b1;
    --accent: #5cc9a1;
    --border: #2a3138;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { border-bottom: 1px solid var(--border); margin-bottom: 24px; padding-bottom: 12px; }
header .brand { font-weight: 600; color: var(--accent); text-decoration: none; }
nav { font-size: 15px; margin-top: 8px; }
nav a { color: var(--muted); margin-right: 16px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin-top: 32px; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }
a { color: var(--accent); }
.updated { color: var(--muted); font-size: 15px; }
.lang-switch { font-size: 15px; }
.provider { border-left: 3px solid var(--border); padding-left: 12px; }
section[lang="en"] { border-top: 1px solid var(--border); margin-top: 48px; padding-top: 24px; }
footer { color: var(--muted); font-size: 14px; margin-top: 48px; }