*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:#f3efe4;font-family:Arial,Noto Sans TC,sans-serif}button,input{font:inherit}.container{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.card{background:#fff;border-radius:16px;width:100%;max-width:420px;padding:36px;box-shadow:0 8px 30px #0000001a}.gameCard{background:#fff;border-radius:16px;width:100%;max-width:760px;padding:28px;box-shadow:0 8px 30px #0000001a}h1{text-align:center;margin-top:0}.subtitle{text-align:center;color:#666;margin-bottom:30px}.primary,.secondary{cursor:pointer;border:0;border-radius:8px;width:100%;padding:14px}.primary{color:#fff;background:#9c2f23}.secondary{color:#fff;background:#222}button:disabled{opacity:.5;cursor:not-allowed}input{text-align:center;letter-spacing:4px;border:1px solid #ccc;border-radius:8px;width:100%;margin-bottom:12px;padding:14px;font-size:20px}.divider{text-align:center;color:#888;margin:20px}.message{text-align:center;color:#555;margin-top:20px}.roomSummary{background:#f7f7f7;border-radius:8px;justify-content:space-between;gap:10px;margin:15px 0 20px;padding:14px;display:flex}.waiting{text-align:center;color:#666;padding:30px}.gameArea{width:100%}.gameHeader{background:#faf6e8;border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:14px;padding:12px 16px;display:flex}.board{background:#d8a45c;border:4px solid #6e441d;border-radius:6px;width:100%;max-width:600px;margin:0 auto;padding:12px}.boardRow{grid-template-columns:repeat(9,1fr);display:grid;position:relative}.boardSquare{aspect-ratio:1;cursor:pointer;background:#f0c67ecc;border:1px solid #502d0fbf;justify-content:center;align-items:center;min-width:0;padding:2px;display:flex}.boardSquare:hover{background:#ffdfa6}.selectedSquare{background:#fff3a1}.chessPiece{aspect-ratio:1;background:#f5d69b;border:3px solid;border-radius:50%;justify-content:center;align-items:center;width:82%;font-family:Noto Serif TC,serif;font-size:clamp(16px,4vw,32px);font-weight:700;display:flex;box-shadow:0 2px 5px #00000040}.redPiece{color:#b21f19}.blackPiece{color:#171717}.river{pointer-events:none;opacity:.32;justify-content:space-around;font-family:serif;font-size:clamp(10px,2.3vw,20px);font-weight:700;display:flex;position:absolute;bottom:-4px;left:0;right:0}.selectedInfo{text-align:center;color:#8b5c20;margin-top:12px}.winner{text-align:center;background:#fff0d6;border-radius:8px;margin-top:20px;padding:16px;font-size:22px;font-weight:700}@media (max-width:640px){.container{padding:8px}.gameCard{padding:12px}.board{padding:5px}.chessPiece{border-width:2px}.roomSummary{text-align:center;flex-direction:column}}
