:root {
    --primary-color: #87CEEB; /* Sky blue */
    --secondary-color: #FFA500; /* Orange */
    --dark-color: #343a40;
    --light-color: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
}

/* Header & Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

/* Banner Slider */
.banner-slider {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 0;
}

.carousel-content {
    padding: 20px;
}

.carousel-content h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 15px;
}

.carousel-content .author {
    font-style: italic;
    margin-bottom: 15px;
}

.carousel-content .description {
    margin-bottom: 20px;
}

.carousel-content .btn {
    background-color: white;
    color: var(--primary-color);
    border: none;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: bold;
    transition: all 0.3s;
}

.carousel-content .btn:hover {
    background-color: var(--secondary-color);
    color: white;
}

/* Book Cards */
.book-card {
    border: none;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.book-card .card-img-top {
    height: 200px;
    object-fit: cover;
}

.book-card .card-title {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--dark-color);
}

.book-card .author {
    color: #6c757d;
    font-size: 0.9rem;
}

.book-card .price {
    font-weight: bold;
    color: var(--secondary-color);
}

.book-card .btn {
    background-color: var(--primary-color);
    border: none;
    border-radius: 20px;
    padding: 5px 15px;
}

.book-card .btn:hover {
    background-color: var(--secondary-color);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 0 20px;
}

.footer h5 {
    font-weight: bold;
    margin-bottom: 20px;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer a:hover {
    color: white;
}

.footer .social-icons a {
    display: inline-block;
    margin-right: 15px;
    font-size: 1.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .carousel-content h2 {
        font-size: 1.8rem;
    }
    
    .carousel-content .btn {
        padding: 8px 20px;
    }
}

@media (max-width: 576px) {
    .book-card .card-title {
        font-size: 1rem;
    }
    
    .book-card .btn {
        padding: 4px 12px;
        font-size: 0.8rem;
    }
}

/* Modal styles */
.modal-content {
    border-radius: 15px;
    border: none;
}
 
.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-top-left-radius: 15px;
    border-top-right-radius: 15px;
}

.btn-close {
    filter: invert(1);
}

/* Form styles */
.form-control {
    border-radius: 10px;
    padding: 12px 15px;
    border: 1px solid #ced4da;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(135, 206, 235, 0.25);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 10px;
    padding: 10px 20px;
}

.btn-primary:hover {
    background-color: #6bb8e0;
    border-color: #6bb8e0;
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    border-radius: 10px;
    padding: 10px 20px;
}

.btn-secondary:hover {
    background-color: #e59400;
    border-color: #e59400;
}