:root {
  --bg: #f2f4f3;
  --surface: #ffffff;
  --text: #1a1f1d;
  --muted: #4b5552;
  --primary: #c2410c;
  --secondary: #0b5e82;
  --border: #d6dbd9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141816;
    --surface: #1d2321;
    --text: #eef1f0;
    --muted: #b3bcb9;
    --primary: #f97316;
    --secondary: #5cb8e0;
    --border: #2f3734;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}
header {
  background: var(--surface);
  border-bottom: 3px solid var(--primary);
}
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
nav a { color: var(--secondary); margin-left: 16px; text-decoration: none; font-weight: 500; }
nav a:first-child { margin-left: 0; }
.wrap { max-width: 760px; margin: 0 auto; padding: 16px; }
main { padding-bottom: 48px; }
h1 { font-size: 30px; line-height: 1.25; margin: 24px 0 4px; }
h2 { font-size: 21px; margin: 32px 0 8px; color: var(--secondary); }
h3 { font-size: 18px; margin: 20px 0 6px; }
.meta { color: var(--muted); font-size: 15px; margin: 0 0 16px; }
a { color: var(--secondary); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0;
}
.warning {
  background: #fef3c7;
  border-left: 5px solid #b45309;
  color: #78350f;
  border-radius: 6px;
  padding: 12px 16px;
  margin: 16px 0;
}
.lead { font-size: 20px; color: var(--muted); }
.button {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 14px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  min-height: 56px;
}
footer { color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }
footer a { margin-right: 14px; }