:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #0f1117;--surface: #1a1d27;--border: rgba(255, 255, 255, .1);--tile-bg: #2a2d3a;--tile-border: #3d4155;--pip-color: #e8e8e8;--accent: #6c8cff;--accent-hover: #8ba4ff;--green: #4ade80;--red: #f87171;--gold: #fbbf24}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:var(--bg);color:#fafafa}.app{min-height:100vh;display:flex;flex-direction:column;max-width:1200px;margin:0 auto;padding:1rem;gap:1rem}.header{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.header 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p{margin:0;color:#fff9}@media(max-width:640px){.app{padding:.5rem;gap:.5rem}.header{gap:.5rem}.board{min-height:80px;padding:.5rem}.domino-tile.horizontal .tile-half{width:30px;height:38px}.domino-tile.vertical .tile-half{width:38px;height:30px}.domino-back{width:30px;height:38px}}