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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    min-height: calc(100vh - 140px);
}

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

header h1 {
    font-size: 2.5em;
    color: #667eea;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}


.categories {
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.category-tag {
    background: #e9ecef;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    color: #555;
    cursor: pointer;
    transition: all 0.3s;
}

.category-tag:hover {
    background: #667eea;
    color: white;
}

.category-tag.active {
    background: #667eea;
    color: white;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.site-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid #e9ecef;
    cursor: pointer;
    position: relative;
}

.site-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.site-card .site-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 15px;
    border-radius: 10px;
    object-fit: cover;
    background: #f8f9fa;
}

.site-card .site-icon-placeholder {
    width: 48px;
    height: 48px;
    margin: 0 auto 15px;
    border-radius: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.2em;
}

.site-card .site-name {
    font-size: 1.1em;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
    word-break: break-word;
}

.site-card .site-category {
    font-size: 0.85em;
    color: #999;
    margin-top: 5px;
}


footer {
    text-align: center;
    padding: 20px;
    color: rgba(255, 255, 255, 0.9);
}

footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.9em;
    transition: color 0.3s;
}

footer a:hover {
    color: white;
    text-decoration: underline;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state p {
    font-size: 1.1em;
    margin-top: 10px;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2em;
    }

    .sites-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
}