/* Section3 - Dot background */
#section3 {
    position: relative;
    padding: 4rem 0;
    background-image: radial-gradient(var(--border-color) 1px, transparent 0);
    background-size: 20px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#section3 .book-card {
    opacity: 1 !important;          /* luôn rõ */
    filter: none !important;        /* bỏ tất cả filter */
    mix-blend-mode: normal !important; 
    transform: scale(1);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Hover phóng to và nổi bật hơn */
#section3 .book-card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

/* Thông tin sách chỉ hiện khi hover */
#section3 .book-info {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
}

#section3 .book-card:hover .book-info {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* ---------- Carousel Horizontal ---------- */
#section3 .book-carousel-wrapper.static-carousel {
    display: flex;
    justify-content: center;
    overflow-x: auto;
    padding: 1rem 0;
    gap: 1.5rem;
}

#section3 .book-carousel {
    display: flex;
    gap: 1.5rem;
    flex-wrap: nowrap;
    cursor: default;
}

/* Light / Dark theme */
/* FIX NGƯỢC MÀU – THEO BODY */
body.light-theme #section3,
body.light-theme #section3 * {
    --bg-color: #fff !important;
    --text-color: #222 !important;
    --border-color: #ccc !important;
    background-color: var(--bg-color) !important;
    color: var(--text-color) !important;
}

body.dark-theme #section3,
body.dark-theme #section3 * {
    --bg-color: #1e1e1e !important;
    --text-color: #eee !important;
    --border-color: #555 !important;
    background-color: var(--bg-color) !important;
    color: var(--text-color) !important;
}

/* Book cards remain visible in dark mode */
#section3.dark-theme .book-card {
    box-shadow: 0 4px 10px rgba(255,255,255,0.1);
}
/* Mobile & tablet: scroll ngang với snap */
@media (max-width: 991px) {
    #section3 .book-carousel-wrapper.static-carousel {
        overflow-x: auto;               /* cho phép scroll ngang */
        -webkit-overflow-scrolling: touch; /* vuốt mượt trên iOS */
        scroll-snap-type: x mandatory;  /* snap từng book-card */
        padding: 1rem 0;
    }

    #section3 .book-carousel {
        display: flex;
        gap: 1rem;
        flex-wrap: nowrap;
    }

    #section3 .book-card {
        flex-shrink: 0;
        width: 120px;
        scroll-snap-align: start;
    }

    #section3 .book-card img {
        height: 180px;                  /* co hình theo card */
    }
}

/* Mobile nhỏ hơn 480px */
@media (max-width: 479px) {
    #section3 .book-card {
        width: 100px;
    }

    #section3 .book-card img {
        height: 150px;
    }
}
/* ==================== SECTION 3 – HOVER TRẮNG SÁNG 100% (BẮN PHÁT ĂN THẬT) ==================== */
#section3 .book-card {
    position: relative;
    transition: transform 0.4s ease;
    border-radius: 12px;
    overflow: hidden;
}

#section3 .book-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Nền tối cực mạnh khi hover */
#section3 .book-cover-wrapper {
    position: relative;
}
#section3 .book-cover-wrapper::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0.75), rgba(0,0,0,0.6));
    opacity: 0;
    transition: opacity 0.4s ease;
    border-radius: 12px;
    pointer-events: none;
}
#section3 .book-card:hover .book-cover-wrapper::after {
    opacity: 1;
}

/* BẮN PHÁT ĂN THẬT – CHỮ TRẮNG SÁNG KHÔNG THỂ NÀO KHÔNG ĐỌC ĐƯỢC */
#section3 .book-card .book-title,
#section3 .book-card .book-author,
#section3 .book-card small {
    transition: color 0.4s ease !important;
}

#section3 .book-card:hover .book-title,
#section3 .book-card:hover .book-author,
#section3 .book-card:hover small,
#section3 .book-card:hover .book-info * {
    color: #ffffff !important;
    text-shadow: 0 2px 10px rgba(0,0,0,0.9) !important;
}

/* Badge thể loại vẫn nổi bật */
#section3 .badge {
    z-index: 10;
    font-size: 0.85rem;
}