:root{font-family:system-ui,sans-serif;color:#0f172a;background:#e2e8f0}*{box-sizing:border-box}body{margin:0}#app{max-width:1280px;margin:0 auto;padding:16px}h1{margin:0 0 12px;font-size:1.6rem}h2{margin:8px 0;font-size:1.05rem}.topbar,.playback-controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:12px;border:1px solid #94a3b8;border-radius:8px;background:#fff}#seed{width:130px}.game-layout{display:grid;grid-template-columns:290px minmax(390px,1fr) 290px;gap:16px;align-items:start;margin:16px 0}.player-region,.lane-region,.rival-region{min-width:0;padding:10px;border:1px solid #94a3b8;border-radius:8px;background:#fff}.canvas-grid{position:relative;width:270px;height:270px}canvas{display:block;max-width:100%}#lane{width:100%;min-height:250px}.grid-controls{position:absolute;inset:0;display:grid}.grid-controls button{min-width:0;padding:0;border:1px solid transparent;color:transparent;background:transparent;cursor:pointer}.grid-controls button:disabled{cursor:default}.hand{display:flex;min-height:38px;flex-direction:column;gap:6px;margin-bottom:8px}button,input,select{min-height:36px;padding:6px 10px;font:inherit}button{border:1px solid #475569;border-radius:5px;color:#0f172a;background:#f8fafc}button[aria-pressed=true]{background:#bfdbfe;outline:3px solid #2563eb}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #f97316;outline-offset:2px}button:disabled{opacity:.55}#tick{min-width:220px;flex:1}.message{min-height:24px;color:#b91c1c;font-weight:600}.result{padding:14px;border:2px solid #15803d;border-radius:8px;background:#dcfce7;font-size:1.15rem;font-weight:700}[hidden]{display:none!important}@media(max-width:900px){#app{padding:10px}.game-layout{grid-template-columns:1fr}.player-region,.lane-region,.rival-region{display:flex;flex-direction:column;align-items:flex-start}.canvas-grid{flex:0 0 270px}#tick{min-width:160px}}