*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f5f5f5;color:#333;line-height:1.6}.container{max-width:1200px;margin:0 auto;padding:20px}header{text-align:center;margin-bottom:30px}header h1{font-size:2.5em;margin-bottom:10px}header p{color:#666;font-size:1.1em}.main-content{display:flex;gap:30px;align-items:flex-start}.board-container{flex:1;background:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a;padding:20px;text-align:center}#goBoard{max-width:100%;height:auto;border:2px solid #333;border-radius:4px}.controls{width:300px;display:flex;flex-direction:column;gap:20px}.control-group{background:#fff;border-radius:12px;box-shadow:0 2px 4px #0000001a;padding:20px}.control-group h3{margin-bottom:15px;font-size:1.2em;color:#2c3e50}.button-row{display:flex;gap:10px;margin-bottom:15px}button{background:#3498db;color:#fff;border:none;padding:10px 15px;border-radius:6px;cursor:pointer;font-size:1em;transition:background .3s ease}button:hover{background:#2980b9}button:disabled{background:#bdc3c7;cursor:not-allowed}input[type=file]{width:100%;margin-bottom:10px;padding:8px;border:1px solid #ddd;border-radius:6px}input[type=range]{width:100%;margin:10px 0}.move-info{text-align:center;font-weight:700;color:#2c3e50}#branchInfo{background:#ecf0f1;padding:10px;border-radius:6px;margin-bottom:10px;text-align:center;font-weight:500}#gameInfo{background:#ecf0f1;padding:15px;border-radius:6px}#gameInfo div{margin-bottom:8px;display:flex;justify-content:space-between}#gameInfo span{font-weight:700;color:#2c3e50}#statusBar{background:#2c3e50;color:#fff;padding:15px;border-radius:8px;text-align:center;font-weight:500;margin-top:20px}@media (max-width: 768px){.main-content{flex-direction:column}.controls{width:100%}.button-row{flex-wrap:wrap}}.keyboard-hint{background:#f8f9fa;padding:10px;border-radius:6px;font-size:.9em;color:#666;margin-top:10px}.keyboard-hint kbd{background:#e9ecef;padding:2px 6px;border-radius:3px;font-family:monospace;border:1px solid #dee2e6}