:root { --bg: #f4f1ea; --fg: #222; --tile: #cfe3e8; --accent: #2b7a78; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #1b1d1f; --fg: #eee; --tile: #2c3e44; } }
body { margin: 0; padding: 1rem; background: var(--bg); color: var(--fg); font: 16px/1.4 system-ui, sans-serif; text-align: center; }
a { color: var(--accent); }
button { font: inherit; padding: .5rem 1rem; border-radius: .5rem; border: 2px solid var(--accent); background: none; color: inherit; cursor: pointer; }