body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.controls button {
    padding: 8px 16px;
    margin-left: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.category {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.category h2 {
    margin-top: 0;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.bookmarks {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.bookmark {
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    transition: all 0.2s;
}

.bookmark:hover {
    background-color: #e9e9e9;
    transform: translateY(-2px);
}

.bookmark a {
    text-decoration: none;
    color: #333;
    display: block;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border-radius: 8px;
    width: 80%;
    max-width: 500px;
}

.close {
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}