body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
}

header,
footer {
    background: #2c3e50;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}

main {
    padding: 30px;
    max-width: 600px;
    margin: 30px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0;
}

form label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
    color: #34495e;
}

form input,
form select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
}

form button {
    margin-top: 20px;
    padding: 12px 0;
    background: #2980b9;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 18px;
    width: 100%;
    transition: background 0.3s;
}

form button:hover {
    background: #3498db;
}

/* Responsive */
@media (max-width: 700px) {
    main {
        padding: 15px;
        max-width: 95%;
        margin: 15px auto;
    }

    form input,
    form select,
    form button {
        font-size: 15px;
        padding: 10px;
    }
}

@media (max-width: 480px) {

    header,
    footer {
        padding: 12px 0;
        font-size: 16px;
    }

    h1 {
        font-size: 22px;
    }

    main {
        padding: 8px;
    }

    form label {
        font-size: 15px;
    }
}

/* ...existing code... */

.book-list-container {
    max-width: 800px;
    margin: 30px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 30px;
}

.book-list-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.book-list-table th,
.book-list-table td {
    border: 1px solid #ddd;
    padding: 12px 8px;
    text-align: left;
}

.book-list-table th {
    background: #2980b9;
    color: #fff;
}

.book-list-table tr:nth-child(even) {
    background: #f4f4f4;
}

.book-list-table tr:hover {
    background: #eaf6fb;
}

@media (max-width: 700px) {
    .book-list-container {
        padding: 15px;
        max-width: 98%;
    }

    .book-list-table th,
    .book-list-table td {
        padding: 8px 4px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .book-list-container {
        padding: 8px;
    }

    .book-list-table th,
    .book-list-table td {
        font-size: 13px;
        padding: 6px 2px;
    }
}