:root {
  --bg: #f5faf9;
  --text: #16302e;
  --muted: #4b6663;
  --card: #ffffff;
  --border: #d5e6e3;
  --brand: #0f766e;
  --link: #0f766e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a19;
    --text: #e3efed;
    --muted: #9db6b2;
    --card: #172524;
    --border: #2a3d3b;
    --link: #5eead4;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header {
  background: linear-gradient(135deg, #14b8a6, #0f5f63);
  color: #fff;
  padding: 48px 16px 40px;
  text-align: center;
}
header img { width: 96px; height: 96px; }
header h1 { margin: 12px 0 4px; font-size: 2rem; line-height: 1.2; }
header p { margin: 0; opacity: 0.9; }
nav { margin-top: 20px; }
nav a { color: #fff; margin: 0 10px; font-weight: 600; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px 24px 16px;
  margin-bottom: 24px;
}
h2 { font-size: 1.35rem; margin-top: 20px; }
h3 { font-size: 1.05rem; margin-bottom: 4px; }
a { color: var(--link); }
.muted { color: var(--muted); font-size: 0.9rem; }
.lang { float: right; font-size: 0.85rem; color: var(--muted); font-weight: 600; margin-top: 24px; }