* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.menu {
    background-color: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.menu-title {
    margin-bottom: 1rem;
    color: #2c3e50;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}

.menu-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.btn {
    padding: 0.8rem 1.2rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-danger {
    background-color: #e74c3c;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.content {
    background-color: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input,
select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.book-list {
    margin-top: 1rem;
}

.book-item {
    border: 1px solid #eee;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
    background-color: #f9f9f9;
}

.book-item h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.alert {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
    font-weight: 500;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    color: #7f8c8d;
}

@media (max-width: 768px) {
    .menu-options {
        grid-template-columns: 1fr;
    }
}