:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #f5f6fa;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: var(--background-color);
}

header {
    background: white;
    padding: 1rem 2rem;
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo img {
    width: 40px;
    height: 40px;
}

.category-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.category {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--card-shadow);
}

.category h2 {
    margin: 0 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
    color: #2c3e50;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.site-card {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    border: 1px solid #eee;
}

.site-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
    border-color: var(--primary-color);
}

.site-icon {
    width: 32px;
    height: 32px;
    margin-right: 1rem;
    border-radius: 8px;
}

.site-info {
    flex: 1;
}

.site-info h3 {
    margin: 0;
    font-size: 1rem;
    color: #2c3e50;
}

.site-info p {
    margin: 0.25rem 0 0;
    font-size: 0.875rem;
    color: #7f8c8d;
}

/* 添加动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category {
    animation: fadeIn 0.5s ease-out forwards;
}

.site-card {
    animation: fadeIn 0.5s ease-out forwards;
}