:root{--bg-color:#e0e5ec;--text-main:#2c3e50;--text-secondary:#34495e;--text-highlight:#4a6fa5;--shadow-light:#ffffff;--shadow-dark:#b8c0c8;--color-red:#e74c3c;--color-black:#34495e;--color-success:#27ae60;--color-warning:#e67e22;--cell-size:clamp(30px, 8vw, 60px);--piece-size:calc(var(--cell-size) * 0.85);--board-padding:20px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:"Microsoft Yahei",sans-serif;background-color:var(--bg-color);color:var(--text-main);min-height:100vh;display:flex;justify-content:center;align-items:center}.game-wrapper{display:flex;flex-direction:column;align-items:center;gap:20px;padding:20px;width:100%;max-width:1200px}.game-header{text-align:center;margin-bottom:10px}.game-header h1{font-size:clamp(24px, 5vw, 32px);color:var(--text-highlight);text-shadow:2px 2px 4px var(--shadow-dark),-2px -2px 4px var(--shadow-light)}.status-badge{margin-top:10px;font-size:14px;color:var(--text-secondary)}.status-badge.connected{color:var(--color-success)}.game-container{display:flex;flex-direction:column;gap:30px;align-items:center}@media (min-width:800px){.game-container{flex-direction:row;align-items:flex-start;justify-content:center}}.board-wrapper{padding:var(--board-padding);border-radius:20px;background:var(--bg-color);box-shadow:10px 10px 20px var(--shadow-dark),-10px -10px 20px var(--shadow-light);position:relative}.board{display:grid;grid-template-columns:repeat(9,var(--cell-size));grid-template-rows:repeat(10,var(--cell-size));position:relative;user-select:none}.cell{position:relative;display:flex;justify-content:center;align-items:center}.cell::before{content:'';position:absolute;top:50%;left:0;width:100%;height:1px;background-color:#99aab5;z-index:0}.cell::after{content:'';position:absolute;top:0;left:50%;width:1px;height:100%;background-color:#99aab5;z-index:0}.cell:nth-child(9n+1)::before{left:50%;width:50%}.cell:nth-child(9n)::before{width:50%}.cell:nth-child(-n+9)::after{top:50%;height:50%}.cell:nth-child(n+82)::after{height:50%}.cell:nth-child(n+37):nth-child(-n+45)::after{height:50%}.cell:nth-child(n+46):nth-child(-n+54)::after{top:50%;height:50%}.cell.cross-tl-br::before{content:'';position:absolute;top:0;left:0;width:141.4%;height:1px;background-color:#99aab5;transform-origin:top left;transform:rotate(45deg);z-index:0}.cell.selected{box-shadow:inset 3px 3px 6px var(--shadow-dark),inset -3px -3px 6px var(--shadow-light);background-image:radial-gradient(circle,rgba(231,76,60,.25) 0,transparent 70%)}.cell.last-move{background-image:radial-gradient(circle,rgba(52,152,219,.3) 0,transparent 70%);box-shadow:inset 0 0 0 1px rgba(52,152,219,.2);border-radius:4px}.piece{width:var(--piece-size);height:var(--piece-size);border-radius:50%;background:var(--bg-color);display:flex;justify-content:center;align-items:center;font-size:calc(var(--piece-size) * .6);font-weight:700;cursor:pointer;z-index:1;box-shadow:4px 4px 8px var(--shadow-dark),-4px -4px 8px var(--shadow-light);transition:all .2s ease}.piece.red{color:var(--color-red);border:2px solid rgba(231,76,60,.1)}.piece.black{color:var(--color-black);border:2px solid rgba(52,73,94,.1)}.piece.selected,.piece:active{box-shadow:inset 4px 4px 8px var(--shadow-dark),inset -4px -4px 8px var(--shadow-light);transform:scale(.95)}.dot{width:12px;height:12px;border-radius:50%;background-color:var(--color-success);opacity:.6;z-index:1;box-shadow:inset 1px 1px 2px var(--shadow-dark),inset -1px -1px 2px var(--shadow-light)}.controls-container{width:100%;max-width:300px;padding:20px;border-radius:20px;background:var(--bg-color);display:flex;flex-direction:column;gap:20px}.neumorphic-raised{box-shadow:10px 10px 20px var(--shadow-dark),-10px -10px 20px var(--shadow-light)}.neumorphic-inset{box-shadow:inset 5px 5px 10px var(--shadow-dark),inset -5px -5px 10px var(--shadow-light);border-radius:10px;padding:10px}.player-info{display:flex;justify-content:space-around;padding-bottom:10px;border-bottom:1px solid rgba(0,0,0,.05)}.player{display:flex;flex-direction:column;align-items:center;gap:5px;opacity:.5;transition:opacity .3s}.player.active{opacity:1;font-weight:700}.player .avatar{width:40px;height:40px;border-radius:50%;display:flex;justify-content:center;align-items:center;background:var(--bg-color);box-shadow:3px 3px 6px var(--shadow-dark),-3px -3px 6px var(--shadow-light);font-weight:700}.player.red .avatar{color:var(--color-red)}.player.black .avatar{color:var(--color-black)}.game-actions{display:flex;gap:10px;justify-content:center}.btn{padding:10px 20px;border:none;border-radius:12px;background:var(--bg-color);color:var(--text-highlight);font-size:14px;cursor:pointer;outline:0;box-shadow:5px 5px 10px var(--shadow-dark),-5px -5px 10px var(--shadow-light);transition:all .2s ease}.btn:active{box-shadow:inset 5px 5px 10px var(--shadow-dark),inset -5px -5px 10px var(--shadow-light);color:#2980b9}.message-area{min-height:60px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:14px;color:var(--text-secondary)}.chat-container{position:fixed;bottom:20px;right:20px;width:300px;height:400px;background:var(--bg-color);border-radius:20px;display:flex;flex-direction:column;z-index:100;transition:transform .3s ease}.chat-container.collapsed{transform:translateY(360px)}.chat-header{padding:10px 20px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid rgba(0,0,0,.05);cursor:pointer}.chat-header h3{color:var(--text-highlight);font-size:16px;margin:0}.chat-messages{flex:1;margin:10px;padding:10px;overflow-y:auto;display:flex;flex-direction:column;gap:10px}.message-bubble{display:flex;align-items:flex-start;gap:8px;max-width:85%;font-size:14px}.message-bubble.left{align-self:flex-start}.message-bubble.right{align-self:flex-end;flex-direction:row-reverse}.msg-avatar{width:24px;height:24px;border-radius:50%;background:var(--bg-color);box-shadow:2px 2px 4px var(--shadow-dark),-2px -2px 4px var(--shadow-light);display:flex;justify-content:center;align-items:center;font-size:12px;font-weight:700;flex-shrink:0}.msg-avatar.red{color:var(--color-red);border:1px solid rgba(231,76,60,.2)}.msg-avatar.black{color:var(--color-black);border:1px solid rgba(52,73,94,.2)}.msg-content{padding:8px 12px;background:var(--bg-color);border-radius:12px;box-shadow:3px 3px 6px var(--shadow-dark),-3px -3px 6px var(--shadow-light);word-break:break-all;line-height:1.4}.message-bubble.right .msg-content{background:var(--text-highlight);color:#fff;box-shadow:3px 3px 6px rgba(74,111,165,.4)}.chat-input-area{padding:10px;display:flex;gap:10px;align-items:center}#chat-input{flex:1;padding:8px 12px;border:none;outline:0;background:0 0;font-size:14px;color:var(--text-main)}.btn-icon{background:0 0;border:none;cursor:pointer;color:var(--text-secondary);font-size:18px;transition:color .2s}.send-btn{color:var(--text-highlight);font-size:20px}.send-btn:hover{color:var(--color-success)}.chat-messages::-webkit-scrollbar{width:6px}.chat-messages::-webkit-scrollbar-thumb{background-color:rgba(0,0,0,.1);border-radius:3px}.river-label{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:24px;color:#99aab5;opacity:.5;pointer-events:none;width:100%;display:flex;justify-content:space-around;padding:0 40px}.board.flipped{transform:rotate(180deg)}.board.flipped .river-label span{transform:rotate(180deg)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.4);display:flex;justify-content:center;align-items:center;z-index:1000;opacity:1;transition:opacity .3s ease}.modal-overlay.hidden{opacity:0;pointer-events:none}.modal-content{width:90%;max-width:400px;padding:30px;background:var(--bg-color);border-radius:20px;display:flex;flex-direction:column;gap:20px;transform:scale(1);transition:transform .3s cubic-bezier(.175, .885, .32, 1.275)}.modal-overlay.hidden .modal-content{transform:scale(.9)}.modal-content h3{color:var(--text-highlight);font-size:20px;text-align:center;margin-bottom:10px}#modal-body{color:var(--text-main);text-align:center;line-height:1.6}#modal-input-container{margin:10px 0}#modal-input{width:100%;padding:12px;border:none;outline:0;background:0 0;color:var(--text-main);font-size:16px;text-align:center}.modal-actions{display:flex;justify-content:center;gap:20px;margin-top:10px}.btn-confirm{color:var(--color-success)}.btn-cancel{color:var(--color-red)}.hidden{display:none!important}