/* 004 ChineseChess - 样式表 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部 */
.header {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
    color: white;
    padding: 20px 30px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(139, 69, 19, 0.3);
}

.header h1 {
    font-size: 28px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 按钮 */
.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-small {
    padding: 6px 16px;
    font-size: 12px;
}

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

/* 游戏模式选择 */
.game-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.mode-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border: 2px solid transparent;
}

.mode-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: #8B4513;
}

.mode-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.mode-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: #333;
}

.mode-card p {
    color: #666;
    font-size: 14px;
}

/* 游戏区域 */
.game-area {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 10px;
    }

    .header h1 {
        font-size: 20px;
    }

    .game-modes {
        grid-template-columns: 1fr;
        gap: 15px;
        margin-top: 20px;
    }

    .mode-card {
        padding: 25px 20px;
    }

    .mode-icon {
        font-size: 48px;
    }

    .game-area {
        padding: 15px;
    }

    .game-info {
        flex-direction: column;
        gap: 15px;
    }

    .game-controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .btn-small {
        padding: 8px 12px;
        font-size: 12px;
    }

    #chessboard {
        max-width: 100%;
        height: auto;
    }

    .move-history {
        padding: 15px;
    }

    .move-list {
        max-height: 100px;
    }
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
}

.player-info.red {
    background: #ffebee;
    color: #c62828;
}

.player-info.black {
    background: #f5f5f5;
    color: #333;
}

.turn-indicator {
    font-size: 20px;
}

.turn-indicator.active {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.game-controls {
    display: flex;
    gap: 10px;
}

/* 棋盘 */
#chessboard {
    display: block;
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    background: #f4d03f;
}

/* 棋谱记录 */
.move-history {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}

.move-history h4 {
    margin-bottom: 15px;
    color: #555;
}

.move-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
    max-height: 150px;
    overflow-y: auto;
}

.move-item {
    padding: 6px 10px;
    background: white;
    border-radius: 4px;
    text-align: center;
    font-family: monospace;
    font-size: 13px;
}

.move-item:nth-child(odd) {
    background: #e3f2fd;
}

/* 弹窗 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.modal-content h2 {
    font-size: 28px;
    margin-bottom: 30px;
    color: #333;
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* 难度选择样式 */
.difficulty-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 30px 0;
    max-width: 800px;
}

.difficulty-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 25px 15px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.difficulty-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    border-color: #667eea;
}

.difficulty-card:nth-child(1):hover {
    border-color: #4caf50;
}

.difficulty-card:nth-child(2):hover {
    border-color: #8bc34a;
}

.difficulty-card:nth-child(3):hover {
    border-color: #ff9800;
}

.difficulty-card:nth-child(4):hover {
    border-color: #f44336;
}

.difficulty-card:nth-child(5):hover {
    border-color: #9c27b0;
}

.difficulty-icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.difficulty-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: #333;
}

.difficulty-card p {
    font-size: 12px;
    color: #666;
    margin-bottom: 10px;
}

.difficulty-level {
    display: inline-block;
    padding: 4px 12px;
    background: #e3f2fd;
    border-radius: 20px;
    font-size: 12px;
    color: #1976d2;
    font-weight: 500;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        padding: 15px 20px;
    }
    
    .header h1 {
        font-size: 20px;
    }
    
    .game-modes {
        grid-template-columns: 1fr;
        margin-top: 30px;
    }
    
    .difficulty-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    #chessboard {
        width: 100%;
        height: auto;
    }
    
    .game-info {
        flex-direction: column;
        gap: 15px;
    }
}