body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    color: #333;
}

h1 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

.book-list {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
}

.book {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px dashed #ddd;
}

.book:last-child {
    border-bottom: none;
}

.btn {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 20px;
    transition: background 0.3s;
}

.btn:hover {
    background: #2980b9;
}