:root { color-scheme: light dark; --fg: #1a1a1a; --muted: #666; --accent: #2b6cb0; --danger: #c0392b; }
* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; line-height: 1.5;
  max-width: 36rem; margin: 3rem auto; padding: 0 1rem; color: var(--fg); }
.card { padding: 1.5rem; border: 1px solid #ddd; border-radius: 12px; }
h1 { margin-top: 0; font-size: 1.4rem; }
input, button { font: inherit; padding: 0.6rem 0.8rem; border-radius: 8px; border: 1px solid #ccc; }
input { width: 100%; margin: 0.5rem 0; }
button { background: var(--accent); color: #fff; border: none; cursor: pointer; }
button.danger { background: var(--danger); }
.muted { color: var(--muted); font-size: 0.9rem; }
.ok { color: #2a7a2a; font-weight: 600; }
footer { margin-top: 2rem; text-align: center; }
a { color: var(--accent); }