body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.screen {
    display: none;
}
.active {
    display: block;
}
h1 {
    color: #333;
    text-align: center;
}
.practice-selector {
    text-align: center;
    margin: 30px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}
.practice-btn {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px;
    font-size: 16px;
    width: 200px;
    /* 移动端触摸优化 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.practice-btn:hover {
    background-color: #218838;
}
/* 移动端触摸反馈 */
.practice-btn:active {
    transform: scale(0.98);
}
.practice-btn.decimal {
    background-color: #007bff;
}
.practice-btn.decimal:hover {
    background-color: #0056b3;
}
.practice-btn.comprehensive {
    background-color: #ffc107;
    color: black;
}
.practice-btn.comprehensive:hover {
    background-color: #e0a800;
}

.practice-btn.observation {
    background-color: #17a2b8;
}

.practice-btn.observation:hover {
    background-color: #138496;
}

/* Info按钮样式 */
.info-btn {
    background-color: #6c757d;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.info-btn:hover {
    background-color: #5a6268;
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.info-button-container {
    margin-top: 30px;
    text-align: center;
}

.range-selector {
    margin: 20px 0;
}
.range-selector label {
    display: block;
    margin: 10px 0;
}
.range-selector input {
    width: 100px;
    padding: 5px;
    margin: 0 10px;
}
.operation-selector {
    margin: 20px 0;
}
.operation-selector label {
    display: inline-block;
    margin: 5px 10px;
}
.number-selector {
    margin: 20px 0;
}
.number-selector label {
    display: block;
    margin: 10px 0;
}
.number-selector input {
    width: 80px;
    padding: 5px;
    margin: 0 10px;
}
.pattern-selector {
    margin: 20px 0;
}
.pattern-selector label {
    display: block;
    margin: 10px 0;
}
.pattern-selector select {
    width: 200px;
    padding: 5px;
    margin: 0 10px;
}
button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px 5px;
}
button:hover {
    background-color: #0056b3;
}
button.skip {
    background-color: #6c757d;
}
button.skip:hover {
    background-color: #545b62;
}
button.skip:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
    opacity: 0.6;
}
button.exit {
    background-color: #dc3545;
}
button.exit:hover {
    background-color: #c82333;
}
.question-container {
    text-align: center;
    margin: 20px 0;
}
.question {
    font-size: 24px;
    font-weight: bold;
    margin: 20px 0;
}
.answer-input {
    padding: 10px;
    font-size: 18px;
    width: 200px;
    margin: 10px;
}
.feedback {
    margin: 10px 0;
    font-weight: bold;
}
.correct {
    color: green;
}
.wrong {
    color: red;
}
.result-item {
    margin: 10px 0;
    padding: 5px;
}
.fastest {
    background-color: #d4edda;
    border-left: 4px solid #28a745;
}
.slowest {
    background-color: #f8d7da;
    border-left: 4px solid #dc3545;
}
.skipped {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
}
.progress {
    margin: 20px 0;
}
.progress-bar {
    height: 10px;
    background-color: #e9ecef;
    border-radius: 5px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background-color: #007bff;
    width: 0%;
    transition: width 0.3s;
}
.loading {
    text-align: center;
    margin: 20px 0;
}
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 0 auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 五子棋对战样式 */
.practice-btn.gomoku {
    background-color: #e83e8c;
    color: white;
}
.practice-btn.gomoku:hover {
    background-color: #d91a72;
}

/* 五子棋设置界面样式 */
.player-setup {
    margin: 20px 0;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
}

.room-actions {
    margin: 20px 0;
}

.action-group {
    margin-bottom: 15px;
    padding: 15px;
    background: #fff;
    border: 1px solid #dee2e6;
    border-radius: 5px;
}

/* 按钮样式 */
button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin: 5px;
    font-size: 14px;
    /* 移动端触摸优化 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    min-height: 44px; /* 移动端最小触摸区域 */
}

button:hover {
    background-color: #0056b3;
}

/* 移动端触摸反馈 */
button:active {
    transform: scale(0.98);
}
.action-btn.primary {
    background-color: #28a745;
}

.action-btn.primary:hover {
    background-color: #218838;
}

.action-btn.secondary {
    background-color: #6c757d;
}

.action-btn.secondary:hover {
    background-color: #545b62;
}

.action-btn.surrender {
    background-color: #dc3545;
}

.action-btn.surrender:hover {
    background-color: #c82333;
}

.action-btn.draw {
    background-color: #ffc107;
    color: #000;
}

.action-btn.draw:hover {
    background-color: #e0a800;
}

.action-description {
    font-size: 12px;
    color: #6c757d;
    margin-top: 5px;
}

.room-status {
    margin: 20px 0;
    padding: 15px;
    background: #e9ecef;
    border-radius: 5px;
}

/* 五子棋游戏界面样式 */
.player-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
}

.player-self, .player-opponent {
    flex: 1;
    text-align: center;
}

.game-status {
    flex: 2;
    text-align: center;
    font-weight: bold;
}

.board-container {
    text-align: center;
    margin: 20px 0;
}

#gomoku-board {
    border: 2px solid #333;
    background: #f0d9b5;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.game-controls {
    text-align: center;
    margin: 20px 0;
}

.game-controls .action-btn {
    margin: 0 10px;
}

/* 聊天区域样式 */
.chat-container {
    margin: 20px 0;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 5px;
}

.chat-container h3 {
    margin-top: 0;
    color: #333;
}

#chat-messages {
    height: 100px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    margin-bottom: 10px;
    background: white;
    border-radius: 4px;
}

.chat-input-container {
    display: flex;
    gap: 10px;
}

#chat-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* 棋子动画效果 */
@keyframes piece-drop {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.piece-animation {
    animation: piece-drop 0.3s ease-out;
}

/* 游戏状态指示器 */
.turn-indicator {
    font-size: 18px;
    font-weight: bold;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.turn-black {
    background-color: #000;
    color: white;
}

.turn-white {
    background-color: #fff;
    color: #000;
    border: 2px solid #000;
}

/* 胜利提示 */
.victory-message {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
    text-align: center;
    font-weight: bold;
}

.defeat-message {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
    text-align: center;
    font-weight: bold;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .player-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .player-self, .player-opponent, .game-status {
        flex: none;
        width: 100%;
    }
    
    #gomoku-board {
        width: 300px;
        height: 300px;
    }
    
    .chat-input-container {
        flex-direction: column;
    }
}

/* 连接状态指示器 */
.connection-status {
    position: fixed;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    z-index: 1000;
}

.connection-connected {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.connection-disconnected {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.connection-connecting {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* 房间信息面板样式 */
.room-info-panel {
    margin: 20px 0;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.room-info-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    z-index: 1;
}

.room-info-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.room-code-label {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 5px;
    position: relative;
    z-index: 2;
}

.room-code {
    font-size: 32px;
    font-weight: bold;
    letter-spacing: 3px;
    margin: 10px 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    position: relative;
    z-index: 2;
    font-family: 'Courier New', monospace;
}

.room-info-panel button {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 8px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    backdrop-filter: blur(10px);
}

.room-info-panel button:hover {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
    transform: scale(1.05);
}

.room-info-panel button:active {
    transform: scale(0.95);
}

#copy-feedback {
    font-size: 12px;
    margin-top: 8px;
    opacity: 0.8;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

/* 房间号脉冲动画 */
@keyframes pulse {
    0% {
        transform: scale(1);
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }
    50% {
        transform: scale(1.05);
        text-shadow: 0 4px 8px rgba(0,0,0,0.4);
    }
    100% {
        transform: scale(1);
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }
}

@keyframes glow {
    0% {
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    }
    50% {
        box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    }
    100% {
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    }
}

.room-info-panel.pulse {
    animation: glow 1s ease-in-out;
}

/* 复制成功动画 */
@keyframes copySuccess {
    0% {
        background: rgba(255,255,255,0.2);
    }
    50% {
        background: rgba(144, 238, 144, 0.4);
    }
    100% {
        background: rgba(255,255,255,0.2);
    }
}

.copy-success {
    animation: copySuccess 0.5s ease-in-out;
}

/* 房间状态指示器 */
.connection-status {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: bold;
    z-index: 2;
}

.connection-connected {
    background: rgba(144, 238, 144, 0.3);
    color: #155724;
    border: 1px solid rgba(144, 238, 144, 0.5);
}

.connection-disconnected {
    background: rgba(255, 182, 193, 0.3);
    color: #721c24;
    border: 1px solid rgba(255, 182, 193, 0.5);
}

.connection-connecting {
    background: rgba(255, 243, 205, 0.3);
    color: #856404;
    border: 1px solid rgba(255, 243, 205, 0.5);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .room-info-panel {
        margin: 15px 0;
        padding: 15px;
    }
    
    .room-code {
        font-size: 24px;
        letter-spacing: 2px;
    }
    
    .room-info-panel button {
        padding: 6px 15px;
        font-size: 12px;
    }
    
    #copy-feedback {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    .room-info-panel {
        margin: 10px 0;
        padding: 12px;
    }
    
    .room-code {
        font-size: 20px;
        letter-spacing: 1px;
    }
    
    .room-code-label {
        font-size: 12px;
    }
    
    /* 小屏幕设备按钮优化 */
    .practice-btn {
        width: 95%;
        margin: 10px 0;
        padding: 20px 15px;
        font-size: 18px;
        min-height: 60px;
    }
    
    button {
        min-height: 50px;
        font-size: 16px;
        padding: 15px 20px;
    }
}

/* 房间号闪烁效果 */
@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0.5;
    }
}

.room-code.blink {
    animation: blink 1s infinite;
}

/* 房间号输入框样式 */
.room-code-input {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
}

.room-code-input input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    text-align: center;
    letter-spacing: 2px;
    font-family: 'Courier New', monospace;
}

.room-code-input button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.room-code-input button:hover {
    background: #0056b3;
}

/* 房间状态指示器 */
.room-status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
    margin-left: 10px;
}

.status-online {
    background: #d4edda;
    color: #155724;
}

.status-offline {
    background: #f8d7da;
    color: #721c24;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-online::before {
    content: '●';
    color: #28a745;
    font-size: 8px;
}

.status-offline::before {
    content: '●';
    color: #dc3545;
    font-size: 8px;
}

.status-pending::before {
    content: '●';
    color: #ffc107;
    font-size: 8px;
}

/* 加载动画 */
.loading-dots {
    display: inline-block;
    animation: loading-dots 1.5s infinite;
}

@keyframes loading-dots {
    0%, 20% {
        content: '.';
    }
    40% {
        content: '..';
    }
    60%, 100% {
        content: '...';
    }
}