/* assets/css/index_custom.css */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%),
        radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 40%) !important;
    padding: 35px 0 25px;
    color: white !important;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://www.transparenttextures.com/patterns/cubes.png');
    opacity: 0.1;
    pointer-events: none;
}

.glass-search {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    padding: 10px;
}

.glass-search .form-control,
.glass-search .form-select {
    background: transparent;
    border: none;
    color: white;
}

.glass-search .form-control::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.glass-search .form-select option {
    color: black;
}

.book-card {
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    background: #fff;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    position: relative;
}

.animate-pulse {
    animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
    0% {
        box-shadow: 0 0 0 0 rgba(25, 135, 84, 0.7);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(25, 135, 84, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(25, 135, 84, 0);
    }
}

.shadow-text {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1) !important;
    border-color: transparent;
}

.book-cover-wrapper {
    height: 280px;
    overflow: hidden;
    position: relative;
    background: #f8f9fa;
}

@media (max-width: 768px) {
    .book-cover-wrapper {
        height: 180px;
    }
}

.book-card .card-title {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    height: 3em;
}

.book-cover-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.book-card:hover .book-cover-wrapper img {
    transform: scale(1.06);
}

.book-card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(2px);
}

.book-card:hover .book-card-overlay {
    opacity: 1;
}

.category-pill {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 20px;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s;
}

.category-pill:hover {
    background: white;
    color: var(--inst-color, #4e73df);
}

.price-tag {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--inst-color, #4e73df);
}

.btn-modern {
    border-radius: 50px;
    font-weight: 600;
    padding: 8px 20px;
}

.section-title {
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 30px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 50px;
    height: 4px;
    background: var(--inst-color, #4e73df);
    border-radius: 2px;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

#backToTop.show {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    transform: translateY(-5px);
}