/* 跑酷游戏扁平化样式 - Material Design */
:root {
    --runner-blue: #03A9F4;
    --urban-gray: #9E9E9E;
    --action-green: #4CAF50;
    --danger-red: #F44336;
    --background-white: #FAFAFA;
    --text-dark: #212121;
    --text-secondary: #757575;
    --surface-white: #FFFFFF;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 16px;
    --border-radius-small: 8px;
}

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

body {
    font-family: 'Microsoft YaHei', 'Roboto', Arial, sans-serif;
    background-color: var(--background-white);
    min-height: 100vh;
    color: var(--text-dark);
    padding: var(--spacing-md);
    line-height: 1.6;
}

.game-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--surface-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    border: 2px solid var(--urban-gray);
}

.game-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.game-header h1 {
    color: var(--runner-blue);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.game-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    background: var(--background-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-small);
    border: 2px solid var(--urban-gray);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--runner-blue);
}

.stat-unit {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.game-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--runner-blue);
    color: var(--surface-white);
}

.btn-primary:hover {
    background-color: #0288D1;
}

.btn-secondary {
    background-color: var(--urban-gray);
    color: var(--surface-white);
}

.btn-secondary:hover {
    background-color: #757575;
}

.btn-link {
    background-color: transparent;
    color: var(--runner-blue);
    border: 2px solid var(--runner-blue);
}

.btn-link:hover {
    background-color: var(--runner-blue);
    color: var(--surface-white);
}

.game-canvas-container {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    background: var(--urban-gray);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

#gameCanvas {
    border-radius: var(--border-radius-small);
    background: var(--surface-white);
    border: 2px solid var(--text-dark);
}

.control-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.control-instructions h3 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
}

.control-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--background-white);
    border-radius: var(--border-radius-small);
    border: 1px solid var(--urban-gray);
}

.control-item kbd {
    background: var(--text-dark);
    color: var(--surface-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.control-item span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.back-link {
    text-align: center;
    margin-top: var(--spacing-xl);
}

@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .game-container {
        padding: var(--spacing-md);
    }
    
    .game-header h1 {
        font-size: 2rem;
    }
    
    .game-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    #gameCanvas {
        width: 100%;
        max-width: 400px;
        height: 300px;
    }
}

.game-container, .btn, .stat-item, .control-item {
    box-shadow: none !important;
    background-image: none !important;
    text-shadow: none !important;
}

.btn, .stat-value {
    transition: all 0.2s ease;
}

.stat-value {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}