:root{--bg: #1a120b;--board: #e9c98a;--board2: #e3bd75;--line: #6b4a23;--red: #b3211f;--black: #16110c;--gold: #d9a441;--panel: #241a10}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(circle at 50% 0%,#2a1d10,var(--bg));color:#f3e4c8;font-family:Segoe UI,system-ui,sans-serif;display:flex;flex-direction:column;align-items:center;min-height:100%;-webkit-user-select:none;user-select:none}h1{font-size:1.5rem;letter-spacing:.06em;margin:.6rem 0 .1rem}h1 .cn{color:var(--gold)}.sub{color:#b79a6a;font-size:.8rem;margin:0 0 .6rem}.bar{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center;justify-content:center;margin-bottom:.5rem}.bar select,.bar button{background:var(--panel);color:#f3e4c8;border:1px solid #4a361f;border-radius:8px;padding:.4rem .7rem;font-size:.85rem;cursor:pointer}.bar button:hover{border-color:var(--gold)}.bar button.primary{background:var(--red);border-color:#d24;color:#fff}#status{min-height:1.4rem;font-size:.95rem;margin:.35rem 0;text-align:center}#status .chk{color:#ffcf6b}#status .win{color:var(--gold);font-weight:700}canvas{background:var(--board);border-radius:10px;box-shadow:0 10px 30px #0008;touch-action:manipulation;display:block;margin-inline:auto}.foot{font-size:.72rem;color:#8a724c;margin:.6rem 1rem 1.2rem;max-width:540px;text-align:center;line-height:1.5}