* {
    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: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

header h1 {
    font-size: 2.5em;
    color: #2c3e50;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

header p {
    font-size: 1.2em;
    color: #7f8c8d;
}

.chart-section {
    background: rgba(255, 255, 255, 0.95);
    margin-bottom: 30px;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chart-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.chart-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8em;
    border-bottom: 3px solid #3498db;
    padding-bottom: 10px;
}

.chart-container {
    position: relative;
    height: 400px;
    margin-bottom: 15px;
    background: #fafafa;
    border-radius: 10px;
    padding: 20px;
}

.chart-description {
    background: #ecf0f1;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.chart-description p {
    color: #555;
    font-size: 1.1em;
    line-height: 1.5;
}

footer {
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    margin-top: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

footer p {
    color: #7f8c8d;
    font-size: 1.1em;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .chart-section {
        padding: 15px;
    }
    
    .chart-container {
        height: 300px;
        padding: 10px;
    }
    
    .chart-section h2 {
        font-size: 1.5em;
    }
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chart-section {
    animation: fadeInUp 0.6s ease forwards;
}

.chart-section:nth-child(1) { animation-delay: 0.1s; }
.chart-section:nth-child(2) { animation-delay: 0.2s; }
.chart-section:nth-child(3) { animation-delay: 0.3s; }
.chart-section:nth-child(4) { animation-delay: 0.4s; }
.chart-section:nth-child(5) { animation-delay: 0.5s; }
.chart-section:nth-child(6) { animation-delay: 0.6s; }
.chart-section:nth-child(7) { animation-delay: 0.7s; }