:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --sub: #5b6572;
  --accent: #E86A38;
  --card: #F6F8FB;
  --border: #e3e8ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0E1116;
    --text: #F2F5F9;
    --sub: #9AA5B1;
    --accent: #FF8A5C;
    --card: #171C24;
    --border: #262d38;
  }
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}
h1 { font-size: 1.7em; line-height: 1.25; }
h2 { font-size: 1.2em; margin-top: 1.8em; }
a { color: var(--accent); }
nav { margin-bottom: 2.2em; font-size: 0.95em; }
nav a { margin-right: 1.2em; text-decoration: none; font-weight: 600; }
nav a:hover { text-decoration: underline; }
.muted { color: var(--sub); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 22px;
  margin: 1.2em 0;
}
footer { margin-top: 4em; font-size: 0.9em; color: var(--sub); }
.logo { font-size: 2.4em; }