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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.chart-container {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chart-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.chart-container h3 {
    text-align: center;
    margin-bottom: 20px;
    color: #4a5568;
    font-size: 1.3rem;
    font-weight: 600;
}

.chart-container canvas {
    width: 100% !important;
    height: 300px !important;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
}

@media (max-width: 768px) {
    .charts-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .chart-container {
        padding: 15px;
    }
}

/* 加载动画 */
.chart-container {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 图表容器特殊样式 */
.chart-container:nth-child(odd) {
    border-left: 4px solid #667eea;
}

.chart-container:nth-child(even) {
    border-left: 4px solid #764ba2;
}