* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: #333;
    color: white;
    padding: 1rem 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
}

.nav-links a:hover {
    color: #ddd;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.book-card {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.book-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 4px;
}

.book-card h3 {
    margin: 1rem 0;
}

.price {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
}

.btn {
    display: inline-block;
    background: #333;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover {
    background: #555;
}

.btn-primary {
    background: #007bff;
}

.btn-primary:hover {
    background: #0056b3;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.form-container {
    max-width: 500px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

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

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

.admin-panel {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

table th,
table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background: #f8f9fa;
    font-weight: bold;
}