.board{--cell:clamp(32px, 10vw, 44px);grid-template-columns:repeat(8, var(--cell));background:#0b3b2e;border:1px solid #0b3b2e;gap:1px;width:max-content;margin:16px auto;display:grid}.cell{width:var(--cell);height:var(--cell);perspective:50px;background:#1f9e79;justify-content:center;align-items:center;display:flex}.cell.legal{cursor:pointer}.cell.legal:after{content:"";background:var(--accent);width:35%;height:35%;box-shadow:0 0 8px var(--accent);opacity:.8;border-radius:50%}.disc{width:75%;height:75%;transform-style:preserve-3d;border-radius:50%;transition:transform .4s;position:relative}.disc.white{transform:rotateY(180deg)}.face{backface-visibility:hidden;border-radius:50%;position:absolute;inset:0}.face.front{background:#000}.face.back{background:#fff;transform:rotateY(180deg)}:root{--bg:#0f172a;--panel:#1e293b;--text:#f1f5f9;--muted:#94a3b8;--accent:#2dd4bf}body{background:var(--bg);min-height:100vh;color:var(--text);justify-content:center;align-items:center;margin:0;font-family:system-ui,sans-serif;display:flex}.lobby,.game{box-sizing:border-box;max-width:92vw;padding:clamp(16px,4vw,32px)}.lobby{background:var(--panel);box-shadow:0 10px 40px rgba(0, 0, 0, 0, .5);text-align:center;border-radius:16px}.lobby h1{letter-spacing:4px;margin:0 0 28px}.lobby h1 .disc{color:var(--accent)}.btn{width:100%;color:var(--text);border:1px solid var(--accent);cursor:pointer;background:0 0;border-radius:10px;margin:12px 0;padding:14px;font-size:16px;transition:all .2s;display:block}.btn:hover{background:var(--accent);color:var(--bg);box-shadow:0 0 16px #2dd4bf80}.game{background:var(--panel);text-align:center;border-radius:16px;box-shadow:0 10px 40px #00000080}.status{color:var(--muted);margin:8px 0;font-size:15px}.status .turn{color:var(--accent);font-weight:700}.status.thinking{color:var(--accent);animation:1s ease-in-out infinite pulse}@keyframes pulse{50%{opacity:.4}}.result{color:var(--accent);font-size:18px;font-weight:700}.row{justify-content:center;gap:12px;display:flex}select{background:var(--bg);color:var(--text);border:1px solid var(--muted);border-radius:8px;padding:6px 10px}