/* 扁平化滑雪游戏样式 - 严格遵循Material Design */

/* 基础重置和变量 */
:root {
    /* Material Design 色彩系统 - 滑雪主题 */
    --snow-white: #FAFAFA;
    --ski-red: #E91E63;
    --mountain-gray: #607D8B;
    --ice-blue: #03A9F4;
    --background-white: #FAFAFA;
    --text-dark: #212121;
    --text-secondary: #757575;
    --surface-white: #FFFFFF;
    
    /* 扁平化设计间距系统 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 统一圆角 */
    --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(--snow-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(--mountain-gray);
}

/* 游戏头部 */
.game-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.game-header h1 {
    color: var(--ski-red);
    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(--mountain-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(--ice-blue);
}

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

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

/* 扁平化按钮设计 */
.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(--ski-red);
    color: var(--surface-white);
}

.btn-primary:hover {
    background-color: #C2185B;
}

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

.btn-secondary:hover {
    background-color: #455A64;
}

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

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

.difficulty-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.difficulty-selector label {
    font-weight: 600;
    color: var(--text-dark);
}

.difficulty-selector select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--mountain-gray);
    border-radius: var(--border-radius-small);
    background: var(--surface-white);
    color: var(--text-dark);
    font-weight: 500;
}

/* 游戏画布区域 */
.game-canvas-container {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    background: var(--ice-blue);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

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

.wind-indicator {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--surface-white);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-small);
    border: 2px solid var(--ice-blue);
    text-align: center;
    min-width: 80px;
}

.wind-arrow {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    transform-origin: center;
    transition: transform 0.3s ease;
}

/* 操控面板 */
.control-panel {
    display: grid;
    grid-template-columns: 1fr 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(80px, 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(--mountain-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);
}

/* 触屏控制 */
.touch-controls {
    display: none;
}

.touch-row {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.touch-btn {
    width: 60px;
    height: 60px;
    background: var(--mountain-gray);
    color: var(--surface-white);
    border: none;
    border-radius: var(--border-radius-small);
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.touch-btn:hover,
.touch-btn:active {
    background: var(--text-dark);
}

/* 重力系统 */
.gravity-system {
    background: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--ice-blue);
}

.gravity-system h3 {
    color: var(--ice-blue);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.gravity-meter {
    background: var(--surface-white);
    border-radius: var(--border-radius-small);
    margin-bottom: var(--spacing-md);
    border: 2px solid var(--ice-blue);
    padding: var(--spacing-md);
}

.slope-indicator {
    position: relative;
    height: 60px;
    background: var(--snow-white);
    border-radius: var(--border-radius-small);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.slope-angle {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        15deg,
        var(--ice-blue) 0%,
        var(--ski-red) 100%
    );
    transform-origin: bottom left;
    transition: transform 0.3s ease;
}

.angle-text {
    position: relative;
    z-index: 1;
    font-weight: 600;
    color: var(--text-dark);
    background: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
}

.gravity-tips {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.tip-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--surface-white);
    border-radius: var(--border-radius-small);
    border: 1px solid var(--ice-blue);
}

.tip-name {
    font-weight: 500;
    color: var(--text-dark);
}

.tip-score {
    font-weight: 700;
    color: var(--ice-blue);
}

/* 障碍系统 */
.obstacle-system {
    background: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--ski-red);
}

.obstacle-system h3 {
    color: var(--ski-red);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.obstacle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.obstacle-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--surface-white);
    border-radius: var(--border-radius-small);
    border: 1px solid var(--ski-red);
}

.obstacle-name {
    font-weight: 500;
    color: var(--text-dark);
}

.obstacle-penalty {
    font-weight: 700;
    color: var(--ski-red);
}

/* 雪道信息 */
.track-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.track-section {
    background: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 2px solid var(--mountain-gray);
}

.track-section h3 {
    color: var(--ski-red);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.track-section ul {
    list-style: none;
    padding: 0;
}

.track-section li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--background-white);
    color: var(--text-dark);
}

.track-section li:before {
    content: "▶ ";
    color: var(--ice-blue);
    font-weight: 700;
}

/* 性能面板 */
.performance-panel {
    background: var(--background-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--mountain-gray);
}

.performance-panel h3 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.performance-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--surface-white);
    border-radius: var(--border-radius-small);
    border: 1px solid var(--mountain-gray);
}

.performance-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.performance-value {
    font-weight: 700;
    color: var(--ice-blue);
}

/* 游戏模态框 */
.game-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    text-align: center;
    min-width: 300px;
    border: 2px solid var(--ski-red);
}

.modal-content h2 {
    color: var(--ski-red);
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
}

.result-stats {
    margin-bottom: var(--spacing-lg);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--background-white);
}

.result-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.result-value {
    font-weight: 700;
    color: var(--ski-red);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* 返回链接 */
.back-link {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* 响应式设计 */
@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);
    }
    
    .game-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    #gameCanvas {
        width: 100%;
        max-width: 400px;
        height: 300px;
    }
    
    .control-panel {
        grid-template-columns: 1fr;
    }
    
    .touch-controls {
        display: block;
    }
    
    .track-info {
        grid-template-columns: 1fr;
    }
    
    .performance-grid {
        grid-template-columns: 1fr;
    }
    
    .gravity-tips {
        grid-template-columns: 1fr;
    }
    
    .obstacle-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 90%;
        max-width: 400px;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .game-header h1 {
        font-size: 1.5rem;
    }
    
    .game-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .stat-value {
        font-size: 1.2rem;
    }
    
    .control-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .touch-btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .slope-indicator {
        height: 40px;
    }
}

/* 扁平化设计强化 */
.game-container,
.btn,
.stat-item,
.control-item,
.track-section,
.performance-item,
.modal-content,
.gravity-system,
.obstacle-system,
.wind-indicator {
    box-shadow: none !important;
    background-image: none !important;
    text-shadow: none !important;
}

/* 动画效果 - 简洁CSS动画 */
.btn,
.touch-btn,
.stat-value,
.wind-arrow,
.slope-angle {
    transition: all 0.2s ease;
}

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

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

/* 雪花动画效果 */
.snow-particle {
    position: absolute;
    color: var(--snow-white);
    font-size: 0.8rem;
    opacity: 0.7;
    animation: snow-fall 3s linear infinite;
}

@keyframes snow-fall {
    0% {
        transform: translateY(-10px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(500px) rotate(360deg);
        opacity: 0;
    }
}