body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px 40px;
    border-radius: 8px;
    box-shadow: 0 2px G10px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #2c3e50;
    text-align: center;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 10px;
    margin-bottom: 30px;
}

.category-title {
    color: #34495e;
    border-bottom: 1px solid #ecf0f1;
    padding-bottom: 8px;
    margin-top: 40px;
    margin-bottom: 20px;
    font-size: 1.5em;
}

.bookmark-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.bookmark-item {
    background-color: #f8f9fa;
    border-radius: 5px;
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    border: 1px solid #e9ecef;
}

.bookmark-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.bookmark-item a {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: #3498db;
    font-weight: 500;
    font-size: 1em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bookmark-item a:hover {
    color: #2980b9;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #7f8c8d;
}

footer a {
    color: #7f8c8d;
    text-decoration: none;
}

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