/* 基础样式 - 兼容Chrome 88 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.header {
    background: linear-gradient(135deg, #1e88e5, #1976d2);
    color: white;
    text-align: center;
    padding: 2rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 20px;
}

.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}

.card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h3 {
    color: #1976d2;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-top: 1rem;
}

.stat-item {
    text-align: center;
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid #e9ecef;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: bold;
    color: #1976d2;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.footer {
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
    border-top: 1px solid #ddd;
    color: #666;
}