/* Design System & Variables */
:root {
    --primary-color: #6200ea;
    --primary-light: #7c4dff;
    --primary-dark: #3700b3;
    --accent-color: #03dac6;
    --accent-hover: #018786;
    --bg-color: #f8f9fd;
    --card-bg: #ffffff;
    --text-primary: #1e1b4b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-subtle: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(98, 0, 234, 0.08), 0 4px 6px -2px rgba(98, 0, 234, 0.03);
    --shadow-hover: 0 20px 25px -5px rgba(98, 0, 234, 0.15), 0 10px 10px -5px rgba(98, 0, 234, 0.08);
}

/* Base resets & styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Plus Jakarta Sans', 'Outfit', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* Layout Constraints - Fixing 'Kenarlara yayılma' issue */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* Header & Banner redone with high-end glassmorphism styling */
header {
    position: relative;
    width: 100%;
    margin-bottom: 2rem;
    overflow: hidden;
}

.banner {
    position: relative;
    background-image: linear-gradient(135deg, rgba(98, 0, 234, 0.85) 0%, rgba(124, 77, 255, 0.7) 100%), url('https://ulkemyanimda.github.io/icons/banner.jpg');
    background-size: cover;
    background-position: center;
    width: 100%;
    height: 320px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Frosted glass overlay details inside the hero banner */
.banner-overlay {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2.5rem 4rem;
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 90%;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    animation: fadeInDown 0.6s ease-out;
}

.banner h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.banner p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    margin-bottom: 0px;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* Search Bar container centered below the hero text */
.search-section {
    max-width: 650px;
    width: 100%;
    margin: -40px auto 2.5rem auto;
    position: relative;
    z-index: 10;
    padding: 0 16px;
    animation: fadeInUp 0.7s ease-out;
}

.search-box-wrapper {
    background: var(--card-bg);
    border-radius: var(--radius-full);
    padding: 8px 8px 8px 24px;
    display: flex;
    align-items: center;
    box-shadow: 0 12px 30px rgba(98, 0, 234, 0.12);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.search-box-wrapper:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 12px 30px rgba(98, 0, 234, 0.25);
    transform: scale(1.01);
}

.search-icon {
    width: 20px;
    height: 20px;
    fill: var(--text-muted);
    margin-right: 12px;
    transition: var(--transition-smooth);
}

.search-box-wrapper:focus-within .search-icon {
    fill: var(--primary-color);
}

.search-input {
    border: none;
    outline: none;
    width: 100%;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-clear-btn {
    border: none;
    background: none;
    padding: 8px;
    cursor: pointer;
    border-radius: var(--radius-full);
    display: none;
    align-items: center;
    justify-content: center;
    margin-right: 8px;
    transition: var(--transition-smooth);
}

.search-clear-btn:hover {
    background-color: var(--bg-color);
}

.search-clear-btn svg {
    width: 18px;
    height: 18px;
    fill: var(--text-secondary);
}

/* Category Filter Tabs List */
.filters-section {
    margin-bottom: 2.5rem;
    overflow: hidden;
}

.filters-wrapper {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 8px 4px 16px 4px;
    scrollbar-width: none; /* Firefox */
}

.filters-wrapper::-webkit-scrollbar {
    display: none; /* Safari & Chrome */
}

.filter-btn {
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-secondary);
    padding: 10px 22px;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-subtle);
}

.filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 8px 16px rgba(98, 0, 234, 0.25);
}

/* Main content areas & grids */
.category-section {
    margin-bottom: 3.5rem;
    animation: fadeIn 0.8s ease-out;
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
}

.category-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    position: relative;
    letter-spacing: -0.02em;
}

.category-title::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

.item-count-badge {
    background-color: rgba(98, 0, 234, 0.08);
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

/* Premium Responsive Card Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 32px;
}

/* Premium Card Component styling */
.book-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-subtle);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition-smooth);
    position: relative;
}

.book-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(98, 0, 234, 0.15);
}

/* Cover Image Container */
.cover-container {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4; /* Standard portrait book ratio */
    overflow: hidden;
    background-color: #f1f5f9;
    border-bottom: 1px solid var(--border-color);
}

.cover-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.book-card:hover .cover-image {
    transform: scale(1.05);
}

/* Dynamic Hover Overlay with Action Button */
.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(30, 27, 75, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    z-index: 2;
}

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

.action-btn {
    background-color: white;
    color: var(--primary-color);
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transform: translateY(15px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.action-btn svg {
    width: 18px;
    height: 18px;
    fill: var(--primary-color);
}

.book-card:hover .action-btn {
    transform: translateY(0);
}

.action-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

.action-btn:hover svg {
    fill: white;
}

/* Card details/footer body */
.card-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    justify-content: space-between;
    gap: 12px;
}

.card-badge {
    align-self: flex-start;
    font-size: 0.75rem;
    font-weight: 700;
    background-color: rgba(98, 0, 234, 0.05);
    color: var(--primary-color);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(98, 0, 234, 0.1);
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    height: 2.8rem; /* Reserve space for 2 lines */
}

/* Video Card Styling */
.video-card .cover-container {
    aspect-ratio: 16 / 9; /* Standard video ratio */
}

/* Empty State / Search Not Found container */
.empty-state {
    text-align: center;
    padding: 5rem 2rem;
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-subtle);
    border: 1px solid var(--border-color);
    margin: 2rem 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.5s ease-out;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    fill: var(--text-muted);
    margin-bottom: 1.5rem;
}

.empty-state h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    max-width: 400px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .banner {
        height: 260px;
    }
    
    .banner-overlay {
        padding: 1.5rem 2rem;
    }
    
    .banner h1 {
        font-size: 2rem;
    }
    
    .banner p {
        font-size: 0.95rem;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 16px;
    }
    
    .category-title {
        font-size: 1.3rem;
    }
    
    .action-btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }
}