:root{--bg: #1a1a1a;--bg-2: #242424;--card: #2a2a2a;--text: #f0f0f0;--text-dim: #a8a8a8;--border: #3a3a3a;--accent: #4a90e2;--accent-hover: #5aa3f0;--danger: #e74c3c;--success: #2ecc71;--warn: #f39c12}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,sans-serif;font-size:16px;line-height:1.5;overscroll-behavior:none;-webkit-font-smoothing:antialiased}button{font-family:inherit;font-size:inherit;cursor:pointer}input{font-family:inherit;font-size:inherit}.lobby{min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 16px;gap:8px}.title{font-size:32px;font-weight:700;margin:0;background:linear-gradient(135deg,#e6c389,#cda35e);-webkit-background-clip:text;background-clip:text;color:transparent}.subtitle{color:var(--text-dim);margin:0 0 16px;font-size:14px}.card{width:100%;max-width:360px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:14px}.field{display:flex;flex-direction:column;gap:6px}.field span{font-size:13px;color:var(--text-dim)}.field input{background:var(--bg-2);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:12px 14px;outline:none;transition:border-color .15s;letter-spacing:.04em}.field input:focus{border-color:var(--accent)}.btn{background:var(--bg-2);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:12px 18px;font-weight:500;transition:all .15s;-webkit-user-select:none;user-select:none}.btn:hover:not(:disabled){border-color:var(--accent);background:#2f2f2f}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn-ghost{background:transparent}.divider{display:flex;align-items:center;gap:12px;color:var(--text-dim);font-size:13px}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border)}.error{color:var(--danger);font-size:13px;text-align:center}.footnote{margin-top:12px;color:var(--text-dim);font-size:12px;text-align:center}.game-room{min-height:100%;display:flex;flex-direction:column;align-items:stretch;padding:12px;gap:10px;max-width:720px;margin:0 auto}.game-header{display:flex;align-items:center;gap:10px}.btn-back{background:var(--bg-2);border:1px solid var(--border);color:var(--text);border-radius:10px;width:36px;height:36px;font-size:18px;display:flex;align-items:center;justify-content:center}.room-code{flex:1;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.room-code .label{color:var(--text-dim);font-size:12px}.room-code strong{font-size:18px;letter-spacing:.15em;font-family:SF Mono,Menlo,Consolas,monospace}.btn-tiny{background:var(--bg-2);border:1px solid var(--border);color:var(--text-dim);border-radius:6px;padding:4px 8px;font-size:12px}.btn-tiny:hover{color:var(--text);border-color:var(--accent)}.conn{font-size:12px;padding:4px 10px;border-radius:999px;border:1px solid var(--border)}.conn-open{color:var(--success);border-color:var(--success)}.conn-connecting{color:var(--warn);border-color:var(--warn)}.conn-closed,.conn-error{color:var(--danger);border-color:var(--danger)}.players{display:grid;grid-template-columns:1fr 1fr;gap:8px}.player{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:10px 12px;transition:all .2s}.player.active{border-color:var(--accent);box-shadow:0 0 0 2px #4a90e233}.stone-icon{width:28px;height:28px;border-radius:50%;flex-shrink:0;border:1px solid rgba(0,0,0,.3)}.stone-black{background:radial-gradient(circle at 35% 35%,#5a5a5a,#000)}.stone-white{background:radial-gradient(circle at 35% 35%,#fff,silver)}.stone-none{background:var(--bg-2)}.player-info{display:flex;flex-direction:column;min-width:0}.player-label{font-size:11px;color:var(--text-dim)}.player-name{font-size:15px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.offline{margin-left:6px;font-size:11px;color:var(--danger);font-weight:400}.board-wrapper{width:100%;max-width:min(92vw,calc(100vh - 320px));aspect-ratio:1;margin:4px auto;touch-action:none;-webkit-user-select:none;user-select:none;border-radius:8px;overflow:hidden;box-shadow:0 6px 20px #00000080}.board-canvas{display:block;width:100%;height:100%}.turn-hint{text-align:center;font-size:15px;padding:8px;color:var(--text-dim);min-height:1.5em}.controls{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.controls .btn{flex:1;min-width:80px;max-width:160px}.toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%);background:#000000d9;color:#fff;padding:10px 18px;border-radius:999px;font-size:14px;pointer-events:auto;cursor:pointer;animation:toast-in .2s ease-out;max-width:92vw;text-align:center;z-index:100}@keyframes toast-in{0%{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%)}}.game-loading{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:var(--text-dim);padding:16px}.loading-card{width:100%;max-width:480px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:14px}.loading-card h2{margin:0;text-align:center;font-size:18px;color:var(--text)}.diag{background:var(--bg-2);border:1px solid var(--border);border-radius:10px;padding:12px 14px;font-size:13px;line-height:1.6}.diag-title{margin:0 0 8px;color:var(--warn);font-weight:500}.diag ol{margin:0;padding-left:20px}.diag code{background:#ffffff14;padding:1px 5px;border-radius:4px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:12px}.diag-url{margin-top:8px;padding:8px 10px;background:var(--bg);border-radius:6px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:11px;word-break:break-all;color:var(--accent)}.diag-tip{margin:10px 0 0;font-size:12px;color:var(--text-dim)}.diag-line{font-size:12px;color:var(--danger);text-align:center}.loading-actions{display:flex;gap:8px;justify-content:center}.config-banner{background:var(--danger);color:#fff;padding:10px 14px;text-align:center;font-size:13px;line-height:1.5}.config-banner code{background:#0000004d;padding:1px 6px;border-radius:4px}@media (max-width: 480px){.title{font-size:28px}.controls .btn{padding:10px 12px;font-size:14px}}