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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

header {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    color: #7f8c8d;
}

nav {
    background: rgba(44, 62, 80, 0.95);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.chart-section {
    background: white;
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.chart-section:hover {
    transform: translateY(-5px);
}

.chart-section h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
}

.chart-container {
    margin: 2rem 0;
    position: relative;
    height: 400px;
}

.data-table {
    margin-top: 2rem;
    overflow-x: auto;
}

.data-table h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #f8f9fa;
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

th {
    background: #3498db;
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background: #e9ecef;
}

tr:hover {
    background: #dbeafe;
}

footer {
    background: rgba(44, 62, 80, 0.95);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        gap: 1rem;
    }
    
    nav a {
        padding: 0.3rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .chart-container {
        height: 300px;
    }
    
    main {
        padding: 1rem;
    }
    
    .chart-section {
        padding: 1rem;
        margin: 1rem 0;
    }
}

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

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

/* 滚动平滑 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}