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

:root {
    --primary-color: #1f2937;
    --secondary-color: #3b82f6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --border-color: #e5e7eb;
    --text-color: #111827;
    --text-light: #6b7280;
    --background-color: #f9fafb;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

header {
    text-align: center;
    padding: 40px 0 30px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

header .version {
    color: var(--secondary-color);
    font-size: 0.9em;
    font-weight: 500;
}

main {
    padding: 20px 0;
}

section {
    margin-bottom: 40px;
}

h2 {
    font-size: 1.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1.5em;
    background-color: var(--secondary-color);
    margin-right: 12px;
}

.alert {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.collections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.collection-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.collection-card:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 4px 6px rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.collection-name {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.collection-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9em;
    color: var(--text-light);
}

.collection-badge {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85em;
}

.loading {
    color: var(--text-light);
    text-align: center;
    padding: 40px;
}

.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.2s ease;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1e40af;
    box-shadow: 0 4px 6px rgba(59, 130, 246, 0.2);
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: #d1d5db;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.details-controls {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
}

.collection-details {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
}

.details-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

.details-table th {
    background-color: var(--background-color);
    padding: 12px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.details-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.details-table tr:hover {
    background-color: var(--background-color);
}

footer {
    text-align: center;
    padding: 40px 0 20px;
    border-top: 2px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9em;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .collections-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 10px;
    }
}