/* =========================================================
   Lumina Core CSS - Al-Hera Library 2026
   Features: Responsive, SEO-Compliant, Modular UI
   ========================================================= */

:root {
    /* Brand Colors - Lumina Scholarly Aesthetic */
    --primary-dark: #1A2B45;       /* Deep Oxford Blue */
    --accent-gold: #C5A059;        /* Muted Gold Leaf */
    --brand-sage: #408A71;         /* Heritage Green */
    --paper-white: #F9F7F2;        /* Parchment Background */
    --text-charcoal: #2D3436;      /* High-readability ink */
    --pure-white: #ffffff;
    
    /* Semantic Colors */
    --gray-bg: #f8f8f9;            
    --border-light: #eaeaea;       

    /* Shadows & Transitions */
    --shadow-soft: 0 4px 20px rgba(26, 43, 69, 0.05);
    --shadow-lift: 0 15px 35px rgba(26, 43, 69, 0.12);
    --transition-smooth: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* --- 1. Base Reset & Typography --- */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--paper-white);
    color: var(--text-charcoal);
    font-family: 'Poppins', 'Inter', sans-serif;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    color: var(--primary-dark);
    font-family: 'Playfair Display', serif;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

a { text-decoration: none !important; transition: var(--transition-smooth); }
img { max-width: 100%; height: auto; display: block; }

/* --- 2. Layout Modules --- */
.bg-gray { background-color: var(--gray-bg); }
.section-padding { padding: 90px 0; }

/* --- 3. The Header & Navigation --- */

.lib-header-wrapper {
    position: relative;
    z-index: 1000;
}

/* Top Bar */
.top-bar {
    background: linear-gradient(90deg, var(--primary-dark) 0%, #0F1A2A 100%);
    padding: 8px 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.top-bar a {
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

.top-bar .hover-gold:hover {
    color: var(--accent-gold);
}

.staff-login-btn {
    background: rgba(255,255,255,0.1);
    color: var(--pure-white) !important;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.staff-login-btn:hover {
    background: var(--accent-gold);
    color: var(--primary-dark) !important;
}
 /* ----- MOBILE DRAWER & OVERLAY (FIX) ----- */
        .mobile-overlay {
            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0,0,0,0.6); z-index: 1050; opacity: 0; visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }
        .mobile-drawer {
            position: fixed; top: 0; right: 0; width: 85%; max-width: 320px; height: 100%;
            background: #fff; z-index: 1060; padding: 1.5rem; box-shadow: -5px 0 25px rgba(0,0,0,0.2);
            transform: translateX(100%); transition: transform 0.35s ease-in-out;
            display: flex; flex-direction: column; overflow-y: auto;
        }
        body.drawer-open .mobile-overlay { opacity: 1; visibility: visible; }
        body.drawer-open .mobile-drawer { transform: translateX(0); }
        body.drawer-open { overflow: hidden; }
        .close-drawer { background: none; border: none; font-size: 1.8rem; cursor: pointer; color: var(--primary-dark); }
        .mobile-nav-links li { margin-bottom: 1.2rem; }
        .mobile-nav-links a { font-size: 1.1rem; font-weight: 500; color: var(--primary-dark); display: block; padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; text-decoration: none; }
        .mobile-nav-links a.active { color: var(--accent-gold); }
        .drawer-footer { margin-top: auto; padding-top: 2rem; }
        .mobile-toggle { background: transparent; border: 1px solid rgba(0,0,0,0.1); padding: 0.5rem 0.8rem; border-radius: 8px; font-size: 1.5rem; cursor: pointer; }
        
        /* ----- STICKY HEADER ----- */
        .main-nav { background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); padding: 5px 0; transition: var(--transition-smooth); position: sticky; top: 0; z-index: 1000; }
        .main-nav.sticky-active { padding: 8px 0; box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
        .nav-links { list-style: none; display: flex; gap: 30px; margin: 0; }
        .nav-links a { color: var(--primary-dark); font-weight: 500; text-decoration: none; position: relative; }
        .nav-links a.active { color: var(--accent-gold); }
        .top-bar { background: var(--primary-dark); padding: 10px 0; font-size: 0.85rem; }
        .top-bar a { color: rgba(255,255,255,0.8); text-decoration: none; }
        .top-bar a:hover { color: var(--accent-gold); }
        

/* --- 4. Hero Overlay & Page Banners --- */
.hero-overlay {
    position: relative;
    background-size: cover;
    background-position: center;
}

.hero-overlay::before {
    content: "";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(26, 43, 69, 0.85); /* Deep Blue Overlay */
    z-index: 0;
}

.hero-content { position: relative; z-index: 1; }

.page-title-banner {
    border-bottom: 3px solid var(--accent-gold);
}

/* --- 5. Interactive UI Components --- */
.btn-lumina {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--primary-dark);
    color: var(--pure-white) !important;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--primary-dark);
    transition: var(--transition-smooth);
}

.btn-lumina:hover {
    background-color: var(--accent-gold);
    border-color: var(--accent-gold);
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.book-card {
    background: var(--pure-white);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lift);
    border-color: rgba(197, 160, 89, 0.5); /* Subtle Gold Border */
}

.category-tag {
    font-size: 0.8rem;
    background: rgba(197, 160, 89, 0.1);
    color: var(--accent-gold);
    padding: 5px 12px;
    border-radius: 20px;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.5px;
}

@media (max-width: 768px) {
    h1 { font-size: 32px; }
    .section-padding { padding: 50px 0; }
    .book-card { padding: 1.5rem; }
}

/* --- 7. Hero Slider Component --- */
.hero-slider-item {
    height: 80vh;
    min-height: 600px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

/* Dynamic Gradient Overlays */
.hero-gradient-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(90deg, rgba(15, 26, 42, 0.9) 0%, rgba(15, 26, 42, 0.6) 50%, rgba(15, 26, 42, 0.2) 100%);
    z-index: 1;
}
.hero-slider-item:nth-child(2) .hero-gradient-overlay {
    background: radial-gradient(circle, rgba(15, 26, 42, 0.7) 0%, rgba(15, 26, 42, 0.9) 100%);
}
.hero-slider-item:nth-child(3) .hero-gradient-overlay {
    background: linear-gradient(270deg, rgba(15, 26, 42, 0.95) 0%, rgba(15, 26, 42, 0.6) 50%, rgba(15, 26, 42, 0) 100%);
}

/* Destroy default slick arrows entirely */
.hero-slider .slick-arrow::before,
.hero-slider .slick-arrow::after {
    content: none !important;
    display: none !important;
    opacity: 0 !important;
}

/* Custom Frosted Glass UI for Slider Arrows */
.hero-slider .slick-arrow {
    font-size: 0 !important;
    color: transparent !important;
    text-shadow: none !important;
    outline: none !important;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.hero-slider .slick-arrow:hover {
    background: var(--accent-gold);
    border-color: var(--accent-gold);
    transform: translateY(-50%) scale(1.1);
}

.hero-slider .slick-prev { left: 30px; }
.hero-slider .slick-next { right: 30px; }

/* Force custom Themify Icons to display correctly */
.hero-slider .slick-arrow i {
    font-size: 24px !important;
    color: #ffffff !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    line-height: 1 !important;
    visibility: visible !important;
}

/* Slick Navigation Dots */
.hero-slider .slick-dots {
    position: absolute;
    bottom: 30px;
    width: 100%;
    text-align: center;
    z-index: 10;
    padding: 0;
    list-style: none;
}
.hero-slider .slick-dots li {
    display: inline-block;
    margin: 0 5px;
}
.hero-slider .slick-dots li button {
    font-size: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    border: none;
    transition: var(--transition-smooth);
}
.hero-slider .slick-dots li.slick-active button {
    background: var(--accent-gold);
    transform: scale(1.3);
}

@media (max-width: 768px) {
    .hero-slider .slick-prev { left: 10px; }
    .hero-slider .slick-next { right: 10px; }
    .hero-slider .slick-arrow { width: 45px; height: 45px; }
}


/* Feature Grid Component Styling */
.feature-grid-section {
    background-color: var(--gray-bg); /* */
}

.feature-card {
    background: var(--pure-white);
    padding: 2.5rem 1.5rem;
    text-align: center;
    border-radius: 15px;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-light);
    height: 100%;
    transition: var(--transition-smooth); /* */
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-lift);
}

.icon-box {
    width: 70px;
    height: 70px;
    background: rgba(197, 160, 89, 0.1); /* Light Gold Tint */
    color: var(--accent-gold);
    font-size: 2.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    transition: var(--transition-smooth);
}

.feature-card:hover .icon-box {
    background: var(--accent-gold);
    color: var(--pure-white);
    transform: rotateY(360deg); /* Modern Interactive Animation */
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

.feature-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-charcoal);
}

img.outlined {
    -webkit-filter: drop-shadow(2px 2px 0 accent-gold)
                    drop-shadow(-2px 2px 0 accent-gold)
                    drop-shadow(2px -2px 0 accent-gold)
                    drop-shadow(-2px -2px 0 accent-gold);

    filter: drop-shadow(2px 2px 0 accent-gold)
            drop-shadow(-2px 2px 0 accent-gold)
            drop-shadow(2px -2px 0 accent-gold)
            drop-shadow(-2px -2px 0 accent-gold);
    }
    /* Hover effect: lift, shadow, scale image inside */
    .book-card-hover {
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .book-card-hover:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.2) !important;
    }
    .book-card-hover .card-img-top {
        transition: transform 0.4s ease;
    }
    .book-card-hover:hover .card-img-top {
        transform: scale(1.02);
    }
    /* Active filter button style */
    .filter-controls .active a {
        color: var(--accent-gold) !important;
        border-bottom: 2px solid var(--accent-gold);
        padding-bottom: 5px;
    }
    .filter-controls a {
        color: var(--text-charcoal);
        font-weight: 600;
        transition: all 0.2s;
    }
    .filter-controls a:hover {
        color: var(--accent-gold);
    }
    /* Page title shimmer (already exists in index) */
    .text-shimmer {
        background: linear-gradient(to right, #C5A059 20%, #E2C285 40%, #E2C285 60%, #C5A059 80%);
        background-size: 200% auto;
        background-clip: text;
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        animation: shine 3s linear infinite;
    }
    @keyframes shine {
        to { background-position: 200% center; }
    }
    /* Pagination active styling */
    .page-item.active .page-link {
        background-color: var(--accent-gold);
        border-color: var(--accent-gold);
        color: #fff;
    }
    .page-link {
        color: var(--primary-dark);
    }