:root{color:#26344a;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;background:#f3f6fb;font-family:Microsoft YaHei,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:280px;margin:0}button{font-family:inherit}.app{color:#26344a;background:#f3f6fb;min-height:100vh}.header{background:#fff;border-bottom:1px solid #e5eaf2;justify-content:space-between;align-items:center;gap:12px;min-height:68px;padding:12px 6%;display:flex}.logo{color:#315ecb;white-space:nowrap;font-size:21px;font-weight:800}.version{color:#8491a5;white-space:nowrap;font-size:12px}.header-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;display:flex}.header-action-button{color:#315ecb;cursor:pointer;background:#f0f5ff;border:1px solid #d5e2ff;border-radius:10px;justify-content:center;align-items:center;gap:6px;min-height:38px;padding:8px 14px;font-family:inherit;font-size:13px;font-weight:600;transition:background .15s,transform .15s;display:inline-flex}.header-action-button:hover{background:#e3edff;transform:translateY(-1px)}.header-action-button:active{transform:translateY(0)}.primary-button,.secondary-button{cursor:pointer;border-radius:10px;width:100%;min-height:46px;padding:12px 16px;font-family:inherit;font-size:15px;font-weight:700;transition:background .15s,border-color .15s}.primary-button{color:#fff;background:#376be0;border:1px solid #376be0}.primary-button:hover:not(:disabled){background:#285bd0}.secondary-button{color:#315ecb;background:#edf3ff;border:1px solid #b9ceff}.secondary-button:hover:not(:disabled){background:#e0eaff}.primary-button:disabled,.secondary-button:disabled{opacity:.48;cursor:not-allowed}button:focus-visible,input:focus-visible{outline-offset:2px;outline:3px solid #89aeff}.lobby-page{justify-content:center;align-items:center;min-height:calc(100vh - 68px);padding:30px 16px;display:flex}.lobby-card{text-align:center;background:#fff;border:1px solid #e6eaf1;border-radius:22px;width:100%;max-width:440px;padding:40px 34px;box-shadow:0 12px 45px #273b5917}.lobby-icon{color:#386ce0;font-size:48px}.lobby-card h1{color:#23344f;margin:10px 0;font-size:30px}.lobby-subtitle{color:#8996aa;margin:0 0 25px;font-size:14px}.connection-status{background:#f6f9ff;border-radius:10px;justify-content:center;align-items:center;gap:8px;margin-bottom:26px;padding:12px;font-size:14px;display:flex}.connection-dot{background:#e65b73;border-radius:50%;width:9px;height:9px}.connection-dot.online{background:#21a366}.lobby-divider{color:#8996aa;margin:24px 0 16px;font-size:13px}.room-input{color:#26344a;text-align:center;letter-spacing:3px;background:#f8faff;border:1px solid #d9e2f0;border-radius:10px;width:100%;min-height:46px;margin-bottom:12px;padding:12px;font-family:inherit;font-size:17px}.room-input:focus{border-color:#4c7ae7}.room-code{color:#315ecb;letter-spacing:5px;text-align:center;background:#eaf0ff;border-radius:14px;margin:12px 0 22px;padding:18px 12px;font-size:31px;font-weight:800}.room-code.small{margin:16px 0 22px;padding:14px 10px;font-size:25px}.waiting-room p{color:#657995;line-height:1.7}.waiting-hint{color:#657995;background:#f6f9ff;border-radius:10px;margin:22px 0;padding:16px;font-size:14px}.feedback-message{color:#a96b21;text-align:center;background:#fff4e7;border-radius:10px;margin:18px 0 0;padding:12px 14px;font-size:13px;line-height:1.7}.game-panel,.info-card{background:#fff;border:1px solid #e6eaf1;border-radius:22px;box-shadow:0 10px 35px #273b590f}.game-heading{text-align:center;margin-bottom:26px}.game-heading h1{color:#23344f;margin:0;font-size:32px;font-weight:800}.game-heading p{color:#91a0b5;margin:12px 0 0;font-size:15px}.status-panel{text-align:center;background:#f0f5ff;border-radius:14px;margin-bottom:24px;padding:17px 14px}.status-panel strong{color:#26344a;font-size:21px}.status-panel p{color:#7186a6;margin:6px 0 0;font-size:14px}.player-x{color:var(--skin-x-color,#3276e5)}.player-o{color:var(--skin-o-color,#e65b73)}.board-wrapper{isolation:isolate;width:100%;max-width:780px;margin:0 auto;position:relative}.board{aspect-ratio:1;background-color:var(--skin-board-color,#34445e);background-image:var(--skin-board,none);background-position:50%;background-size:cover;border-radius:13px;grid-template-rows:repeat(3,minmax(0,1fr));grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;width:100%;padding:7px;display:grid;overflow:hidden}.region{background:#e8eef8;border-radius:5px;min-width:0;min-height:0;padding:5px;position:relative;overflow:hidden}.region.allowed{background:var(--skin-allowed,#ffe5a0)}.region.closed{background:#e4eaf4}.region.winning{background:#ffe7a6}.cells{grid-template-rows:repeat(3,minmax(0,1fr));grid-template-columns:repeat(3,minmax(0,1fr));gap:3px;width:100%;height:100%;display:grid}.cell{background-color:#fff;background-image:var(--skin-cell,none);color:#26344a;cursor:pointer;background-position:50%;background-size:cover;border:none;border-radius:3px;justify-content:center;align-items:center;min-width:0;min-height:0;padding:0;font-family:inherit;font-size:clamp(13px,2.7vw,43px);font-weight:800;line-height:1;transition:background-color .12s;display:flex;position:relative}.cell:disabled{cursor:default}.region.allowed .cell:not(:disabled):hover{background-color:#fff4d5}.cell.player-x{color:var(--skin-x-color,#3276e5)}.cell.player-o{color:var(--skin-o-color,#e65b73)}.piece-pop,.piece-static{justify-content:center;align-items:center;width:100%;height:100%;display:flex}.piece-pop{animation:.18s ease-out piece-pop}@keyframes piece-pop{0%{opacity:.5;transform:scale(.65)}to{opacity:1;transform:scale(1)}}.piece-image{object-fit:contain;pointer-events:none;width:75%;height:75%}.region-overlay{z-index:2;pointer-events:none;background:#f6f9ffe8;justify-content:center;align-items:center;font-size:clamp(28px,7vw,100px);font-weight:800;line-height:1;display:flex;position:absolute;inset:0}.region-overlay.overlay-x{color:var(--skin-x-color,#3276e5)}.region-overlay.overlay-o{color:var(--skin-o-color,#e65b73)}.captured-piece-image{object-fit:contain;width:65%;height:65%}.last-move-dot{pointer-events:none;background:#ff9d00;border-radius:50%;width:12px;height:12px;position:absolute;top:5%;right:5%;box-shadow:0 0 0 2px #fff}.cell.last-move{outline-offset:-2px;outline:2px solid #ff9d00}.victory-line{z-index:5;pointer-events:none;width:100%;height:100%;position:absolute;inset:0;overflow:visible}.victory-line line{stroke:#f6b02c;stroke-width:1.4px;stroke-linecap:round;opacity:.95;filter:none}.game-actions{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:22px;display:flex}.game-actions .primary-button,.game-actions .secondary-button{width:auto;min-width:145px}.game-tip{color:#8b9bb1;text-align:center;margin:18px 0 0;font-size:12px;line-height:1.8}.sidebar{flex-direction:column;gap:24px;min-width:0;display:flex}.info-card{padding:25px}.info-card h2{color:#23344f;margin:0 0 20px;font-size:20px;font-weight:800}.info-card p{color:#6c7f9b;margin:12px 0;font-size:14px;line-height:1.85}.info-card .secondary-button{margin-top:10px}.player-card{background:#f4f6fb;border:2px solid #0000;border-radius:12px;justify-content:space-between;align-items:center;gap:10px;min-height:60px;margin-bottom:12px;padding:14px 18px;font-size:16px;display:flex}.player-x-card.active-player{background:#eaf1ff;border-color:#3276e5}.player-o-card.active-player{background:#fff0f3;border-color:#e65b73}.ui-modal-backdrop{z-index:900;background:#17243b8c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.ui-modal-panel{color:#26344a;background:#fff;border:1px solid #e3e9f3;border-radius:20px;flex-direction:column;width:100%;max-width:460px;max-height:min(85vh,720px);display:flex;overflow:hidden;box-shadow:0 22px 65px #16284638}.ui-modal-header{border-bottom:1px solid #edf1f7;justify-content:space-between;align-items:flex-start;gap:16px;padding:22px 24px 18px;display:flex}.ui-modal-header h2{color:#26344a;margin:0;font-size:20px;font-weight:800}.ui-modal-close{color:#65748c;cursor:pointer;background:#f2f5fa;border:none;border-radius:9px;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:25px;line-height:1;display:flex}.ui-modal-close:hover{color:#315ecb;background:#e6edfa}.ui-modal-body{flex:1;min-height:0;padding:22px 24px;overflow-y:auto}.ui-modal-footer{border-top:1px solid #edf1f7;padding:16px 24px 22px}.ui-modal-footer .primary-button{width:100%}.ui-setting-group+.ui-setting-group{border-top:1px solid #edf1f7;margin-top:26px;padding-top:24px}.ui-setting-group h3{color:#26344a;margin:0 0 8px;font-size:16px;font-weight:700}.ui-setting-description{color:#8290a5;margin:0 0 16px;font-size:13px;line-height:1.7}.skin-options{flex-wrap:wrap;gap:12px;display:flex}.skin-option{color:#53657f;cursor:pointer;background:#f5f7fb;border:1px solid #dce4f0;border-radius:10px;flex:1;min-width:120px;min-height:44px;padding:10px 12px;font-family:inherit;font-size:14px}.skin-option.selected{color:#315ecb;background:#eaf1ff;border:2px solid #376be0;font-weight:700}.sound-toggle{color:#53657f;cursor:pointer;background:#f5f7fb;border:1px solid #dce4f0;border-radius:10px;width:100%;min-height:48px;padding:12px;font-family:inherit;font-size:14px}.sound-toggle:hover{background:#eaf1ff}.ui-history-summary{color:#8290a5;margin:6px 0 0;font-size:13px}.ui-history-list{flex-direction:column;gap:7px;display:flex}.ui-history-list .move-history-item{background:#f5f7fb;border:1px solid #0000;border-radius:10px;align-items:center;gap:18px;min-height:46px;padding:10px 14px;font-size:14px;display:flex}.ui-history-list .move-history-item.latest{background:#eaf1ff;border-color:#a9c4ff}.ui-history-number{color:#697991;min-width:26px}.ui-history-position{color:#26344a;font-weight:600}.ui-history-latest{color:#315ecb;background:#d9e7ff;border-radius:6px;margin-left:auto;padding:3px 8px;font-size:11px;font-weight:700}.ui-history-empty{text-align:center;color:#8290a5;padding:36px 12px}.ui-history-empty-icon{margin-bottom:12px;font-size:36px}.ui-history-empty p{color:#53657f;margin:0 0 8px;font-size:15px;font-weight:600}.ui-history-empty span{font-size:13px}.consent-backdrop{z-index:1000;background:#14203799;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.consent-dialog{text-align:center;background:#fff;border-radius:18px;width:100%;max-width:390px;padding:26px;box-shadow:0 16px 45px #0000002e}.consent-dialog h2{color:#26344a;margin:0 0 18px;font-size:21px}.consent-dialog p{line-height:1.8}.consent-description{color:#697991;font-size:14px}.consent-actions{gap:12px;margin-top:24px;display:flex}.consent-actions button{flex:1;min-width:0}@media (width<=1000px){.game-layout{grid-template-columns:minmax(0,1fr);gap:24px;max-width:820px}.sidebar{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;display:grid}.sidebar .info-card:last-child{grid-column:1/-1}}@media (width<=600px){.header{min-height:62px;padding:10px 12px}.logo{font-size:16px}.header-actions{gap:6px}.header-action-button{min-height:35px;padding:7px 8px;font-size:12px}.header .version{display:none}.lobby-card{padding:30px 20px}.game-layout{gap:18px;padding:16px 10px 35px}.game-panel{border-radius:16px;padding:20px 12px 24px}.game-heading{margin-bottom:18px}.game-heading h1{font-size:26px}.game-heading p{font-size:13px}.status-panel{margin-bottom:18px;padding:13px 10px}.status-panel strong{font-size:17px}.status-panel p{font-size:12px}.board{border-radius:8px;gap:4px;padding:4px}.region{border-radius:3px;padding:3px}.cells{gap:2px}.cell{font-size:clamp(12px,5vw,27px)}.region-overlay{font-size:clamp(24px,14vw,70px)}.last-move-dot{width:7px;height:7px}.game-actions{gap:8px}.game-actions .primary-button,.game-actions .secondary-button{flex:1;min-width:0;padding:10px 8px;font-size:13px}.sidebar{grid-template-columns:minmax(0,1fr);gap:16px}.sidebar .info-card:last-child{grid-column:auto}.info-card{border-radius:16px;padding:20px}.ui-modal-backdrop{padding:12px}.ui-modal-panel{border-radius:16px;max-height:88vh}.ui-modal-header,.ui-modal-body{padding:18px}.ui-modal-footer{padding:14px 18px 18px}.consent-dialog{padding:22px 18px}}@media (prefers-reduced-motion:reduce){.piece-pop{animation:none}.header-action-button{transition:none}}.game-layout{grid-template-columns:minmax(0,1.65fr) minmax(250px,.95fr);align-items:start;gap:20px;width:min(100%,1220px);margin:0 auto;padding:18px 20px 32px;display:grid}.game-panel{min-width:0;padding:20px 22px 24px}.game-heading{margin-bottom:14px}.game-heading h1{font-size:27px}.game-heading p{margin-top:5px}.status-panel{margin-bottom:15px;padding:11px 12px}.status-panel strong{font-size:18px}.status-panel p{margin-top:3px}.board-wrapper{width:100%;max-width:520px;margin:0 auto}.board{aspect-ratio:1;width:100%}.sidebar{flex-direction:column;gap:14px;width:100%;min-width:0;display:flex}.info-card{border-radius:16px;width:100%;min-width:0;padding:18px}.info-card h2{margin-bottom:12px;font-size:18px}.info-card p{margin:8px 0;font-size:13px}.game-actions{margin-top:16px}.game-tip{margin-top:10px}@media (width>=601px) and (width<=1000px){.game-layout{grid-template-columns:minmax(0,1fr);gap:18px;width:100%;max-width:820px;padding:14px}.game-panel{padding:16px 14px 20px}.board-wrapper{max-width:500px}.sidebar{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.sidebar .info-card:last-child{grid-column:1/-1}.info-card{padding:16px}}@media (width<=600px){.game-layout{grid-template-columns:minmax(0,1fr);gap:14px;width:100%;max-width:none;padding:10px}.game-panel{width:100%;min-width:0;padding:14px 10px 18px}.board-wrapper{width:100%;max-width:420px}.sidebar{grid-template-columns:minmax(0,1fr);gap:12px;width:100%;min-width:0;display:grid}.sidebar .info-card,.sidebar .info-card:last-child{grid-column:1/-1;width:100%;min-width:0}}.player-interaction-strip{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0;display:grid}.interaction-player{background:#80808014;border:1px solid #8080803d;border-radius:16px;align-items:center;gap:12px;min-width:0;padding:12px;display:flex;position:relative}.interaction-player.is-turn{outline:2px solid #e5ad4c}.interaction-avatar{background:#ffffffb3;border:2px solid #80808040;border-radius:50%;flex:none;place-items:center;width:54px;height:54px;font-size:31px;display:grid}.interaction-player-meta{gap:4px;min-width:0;display:grid}.interaction-player-meta strong{font-size:14px}.interaction-online{color:#248c59;font-size:12px}.interaction-offline{color:#bd6047;font-size:12px}.quick-bubble{z-index:8;color:#1e293b;overflow-wrap:anywhere;background:#fff9df;border:1px solid #e9dca7;border-radius:12px;max-width:min(290px,85vw);padding:9px 13px;font-size:13px;animation:.2s ease-out bubble-pop;position:absolute;bottom:calc(100% + 9px);left:12px;box-shadow:0 5px 20px #0002}@keyframes bubble-pop{0%{opacity:0;transform:translateY(6px)scale(.96)}to{opacity:1;transform:translateY(0)scale(1)}}.interaction-tools{gap:12px;margin:14px 0;display:grid}.interaction-tools h3{margin:0;font-size:15px}.interaction-avatar-options,.interaction-quick-options{flex-wrap:wrap;gap:8px;display:flex}.interaction-avatar-choice,.interaction-quick-choice{color:inherit;cursor:pointer;background:#80808014;border:1px solid #80808059;border-radius:12px;padding:8px 11px}.interaction-avatar-choice{font-size:23px}.interaction-avatar-choice.selected{outline:2px solid #e5ad4c}.interaction-quick-choice{font-size:13px}.interaction-avatar-choice:disabled,.interaction-quick-choice:disabled{opacity:.5;cursor:not-allowed}.interaction-hint{opacity:.7;margin:0;font-size:12px}@media (width<=560px){.player-interaction-strip{gap:8px}.interaction-player{gap:7px;padding:8px}.interaction-avatar{width:40px;height:40px;font-size:24px}.interaction-player-meta strong,.quick-bubble{font-size:12px}}.lobby-avatar-picker{text-align:left;margin:16px 0 20px}.lobby-avatar-picker h3{margin:0 0 10px;font-size:15px}.lobby-avatar-picker .interaction-avatar-options{justify-content:center}.quick-menu-trigger{cursor:pointer;background:#fffc;border:1px solid #8080804d;border-radius:12px;width:38px;height:38px;font-size:19px}.quick-menu-title{justify-content:space-between;align-items:center;padding:4px 8px 8px;font-size:13px;font-weight:700;display:flex}.quick-menu-title button{cursor:pointer;background:0 0;border:0;font-size:20px}.quick-menu-item{text-align:left;cursor:pointer;width:100%;color:inherit;background:0 0;border:0;border-radius:8px;padding:9px 10px;display:block}.quick-menu-item:hover{background:#f0f3f8}.quick-menu-wrap{flex:none;margin-left:auto;position:relative}.quick-menu-popup{z-index:100;box-sizing:border-box;color:#203047;background:#fff;border:1px solid #ddd;border-radius:14px;width:260px;max-width:calc(100vw - 32px);max-height:310px;padding:8px;position:absolute;top:calc(100% + 8px);overflow-y:auto;box-shadow:0 12px 35px #0003}.quick-menu-left .quick-menu-popup{left:0;right:auto}.quick-menu-right .quick-menu-popup{left:auto;right:0}@media (width<=600px){.quick-menu-popup{width:min(260px,100vw - 32px);max-height:280px}.interaction-player{overflow:visible}}