body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f9fa;
    color: #222;
}
header {
    background: #2d3e50;
    color: #fff;
    padding: 1.5rem 0 1rem 0;
    text-align: center;
}
nav {
    margin-top: 1rem;
}
nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
    transition: color 0.2s;
}
nav a:hover {
    color: #ff9800;
}
.hero {
    background: linear-gradient(90deg, #ff9800 0%, #f44336 100%);
    color: #fff;
    padding: 3rem 1rem;
    text-align: center;
    border-radius: 0 0 30px 30px;
    margin-bottom: 2rem;
}
.btn {
    display: inline-block;
    background: #ff9800;
    color: #fff;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 1rem;
    text-decoration: none;
    transition: background 0.2s;
}
.btn:hover {
    background: #f44336;
}
.product-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    padding: 2rem 1rem;
}
.product-card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 1.5rem;
    width: 250px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}
.product-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}
.product-card img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 1rem;
}
.product-card h3 {
    margin: 0.5rem 0;
}
.product-card p {
    color: #ff9800;
    font-weight: bold;
    margin: 0.5rem 0 1rem 0;
}
.product-detail {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
}
.product-detail img {
    width: 400px;
    border-radius: 15px;
}
.product-info {
    max-width: 400px;
}
.product-info h2 {
    margin-top: 0;
}
.product-info .price {
    color: #ff9800;
    font-size: 1.5rem;
    font-weight: bold;
}
.form-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}
.auth-form {
    background: #fff;
    padding: 2rem 2.5rem;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 320px;
}
.auth-form input {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}
.auth-form button {
    width: 100%;
}
.checkout-section {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
}
.checkout-form {
    background: #fff;
    padding: 2rem 2.5rem;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 350px;
}
.checkout-form input {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}
.checkout-form button {
    width: 100%;
}
.order-summary {
    background: #fff;
    padding: 2rem 2.5rem;
    border-radius: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    width: 250px;
    margin-top: 2rem;
}
footer {
    background: #2d3e50;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
    border-radius: 30px 30px 0 0;
}
        body {
            font-family: 'Segoe UI', Arial, sans-serif;
            background: #f6f8fa;
            margin: 0;
            padding: 0;
        }
        header {
            background: #2d3e50;
            color: #fff;
            padding: 20px 0;
            text-align: center;
        }
        nav a {
            color: #fff;
            margin: 0 15px;
            text-decoration: none;
            font-weight: 500;
        }
        nav a:hover {
            text-decoration: underline;
        }
        .hero {
            background: #fff;
            padding: 40px 20px;
            text-align: center;
            margin: 30px auto;
            max-width: 700px;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.07);
        }
        .btn {
            display: inline-block;
            margin-top: 18px;
            padding: 12px 32px;
            background: #2d3e50;
            color: #fff;
            border-radius: 6px;
            text-decoration: none;
            font-size: 1.1em;
            transition: background 0.2s;
        }
        .btn:hover {
            background: #1a2533;
        }
        .book-gallery {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px;
            margin: 40px auto;
            max-width: 1000px;
        }
        .book-card {
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            width: 180px;
            text-align: center;
            padding: 18px 12px;
            transition: transform 0.2s;
        }
        .book-card:hover {
            transform: translateY(-6px) scale(1.03);
        }
        .book-card img {
            width: 110px;
            height: 160px;
            object-fit: cover;
            border-radius: 6px;
            margin-bottom: 12px;
        }
        .book-title {
            font-size: 1.05em;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .book-author {
            color: #555;
            font-size: 0.95em;
        }
        footer {
            background: #2d3e50;
            color: #fff;
            text-align: center;
            padding: 16px 0;
            margin-top: 40px;
        }