.board{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;width:min(100%,340px);aspect-ratio:1;margin:auto;padding:7px;background:#496657;border:1px solid #284b3b;border-radius:8px}.cell{display:flex;align-items:center;justify-content:center;min-width:0;background:#d5dfcc;border-radius:4px;position:relative;font-size:clamp(15px,3.6vw,22px);font-weight:700;color:#234835}.cell.legal{background:#fff9d9;box-shadow:inset 0 0 0 2px #a49442}.stone{display:grid;place-items:center;width:70%;aspect-ratio:1;border-radius:50%;font-size:12px}.stone.player{background:#174c38;color:#fff}.stone.cpu{background:#fffdf3;color:#294333;border:1px solid #879489}.cell.changed .stone{animation:place .3s ease-out}.stage figcaption{font-size:13px;line-height:1.5;text-align:center;margin-top:8px}.candidates{font-weight:700}.action-row{display:flex;gap:8px;flex-wrap:wrap}@keyframes place{from{transform:scale(.65)}to{transform:scale(1)}}@media(prefers-reduced-motion:reduce){.cell.changed .stone{animation:none}}