:root {
    --primary: #364391;
    --secondary: #27aae0;
}
body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #f5f7ff 0%, #e6f3fa 100%);
    min-height: 100vh;
}
.sitemap-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}
.sitemap-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}
.category-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    transition: all 0.3s ease;
    break-inside: avoid;
    margin-bottom: 1.5rem;
}
.category-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}
.url-item {
    border-left: 3px solid var(--secondary);
    transition: all 0.3s ease;
}
.url-item:hover {
    background-color: #f1f9fe;
    border-left: 3px solid var(--primary);
}
.btn-download {
    background: var(--primary);
    transition: all 0.3s ease;
}
.btn-download:hover {
    background: #2a3574;
    transform: translateY(-2px);
}

/* Masonry-style layout for categories */
.sitemap-masonry {
    column-count: 1;
    column-gap: 1.5rem;
    column-fill: balance;
    transition: all 0.3s ease;
}

@media (min-width: 768px) {
    .sitemap-masonry {
        column-count: 2;
    }
}

@media (min-width: 1024px) {
    .sitemap-masonry {
        column-count: 3;
    }
}

/* Alternative: CSS Grid masonry approach */
.sitemap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    align-items: start;
    transition: all 0.3s ease;
}

/* Fallback for older browsers */
@supports not (column-count: 1) {
    .sitemap-masonry {
        display: flex;
        flex-wrap: wrap;
        align-items: flex-start;
    }
    
    .sitemap-masonry .category-card {
        flex: 1 1 300px;
        max-width: calc(50% - 0.75rem);
    }
}

/* Loading state for smooth transitions */
.layout-transition {
    opacity: 0.7;
    transform: scale(0.98);
}