/* ============================================
   Ingatherer - Ebook Store Styles
   ============================================ */

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #f59e0b;
    --accent: #10b981;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Neutrals */
    --bg-primary: #0f0f14;
    --bg-secondary: #16161d;
    --bg-card: #1c1c26;
    --bg-elevated: #22222e;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #2e2e3a;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* Spacing */
    --container-width: 1280px;
    --header-height: 72px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Header
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(15, 15, 20, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.logo:hover {
    color: var(--primary-light);
}

.logo-icon {
    font-size: 1.8rem;
}

.logo-text {
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

.nav-main {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 10px 18px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-link.active {
    color: var(--text-primary);
    background: var(--primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-container input {
    width: 240px;
    padding: 10px 44px 10px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

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

.search-container input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.search-btn {
    position: absolute;
    right: 8px;
    padding: 6px;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.search-btn:hover {
    color: var(--primary);
}

.icon-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.icon-btn:hover {
    color: var(--text-primary);
    border-color: var(--primary);
}

.current-lang {
    font-size: 0.85rem;
    font-weight: 600;
}

.cart-btn {
    position: relative;
}

.cart-count {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.cart-count:empty,
.cart-count[data-count="0"] {
    display: none;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    padding: calc(var(--header-height) + 80px) 24px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.floating-book {
    position: absolute;
    font-size: 4rem;
    animation: float 6s ease-in-out infinite;
    opacity: 0.3;
}

.book-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.book-2 {
    top: 30%;
    right: 15%;
    animation-delay: -2s;
}

.book-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary);
    background: var(--bg-card);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.9rem;
}

/* ============================================
   Categories Section
   ============================================ */

.categories-section {
    padding: 24px 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: var(--header-height);
    z-index: 100;
}

.categories-scroll {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 4px 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.categories-scroll::-webkit-scrollbar {
    display: none;
}

.category-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: var(--transition-fast);
}

.category-chip:hover {
    color: var(--text-primary);
    border-color: var(--primary);
}

.category-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.chip-icon {
    font-size: 1.1rem;
}

/* ============================================
   Filters Section
   ============================================ */

.filters-section {
    padding: 20px 0;
    background: var(--bg-primary);
}

.filters-bar {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.filter-select {
    padding: 10px 36px 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    transition: var(--transition-fast);
}

.filter-select:hover {
    border-color: var(--primary);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.results-count {
    margin-left: auto;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.results-count span:first-child {
    color: var(--primary);
    font-weight: 600;
}

/* ============================================
   Featured Section
   ============================================ */

.featured-section {
    padding: 60px 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 32px;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 24px;
    overflow: hidden;
}

/* ============================================
   Books Grid
   ============================================ */

.books-section {
    padding: 60px 0 80px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

/* Book Card */
.book-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.book-cover {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    background: var(--bg-elevated);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

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

.book-badges {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.badge {
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-featured {
    background: var(--secondary);
    color: #000;
}

.badge-new {
    background: var(--accent);
    color: white;
}

.badge-bestseller {
    background: var(--primary);
    color: white;
}

.badge-sale {
    background: var(--danger);
    color: white;
}

.book-quick-add {
    position: absolute;
    bottom: 12px;
    right: 12px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-fast);
}

.book-card:hover .book-quick-add {
    opacity: 1;
    transform: translateY(0);
}

.book-quick-add:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.book-info {
    padding: 20px;
}

.book-category {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.book-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.book-rating {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
}

.stars {
    color: var(--secondary);
    font-size: 0.9rem;
}

.rating-count {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.book-price-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.book-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.book-price.free {
    color: var(--accent);
}

.book-original-price {
    font-size: 0.95rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

/* Featured Card (Larger) */
.featured-card {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    cursor: pointer;
    overflow: hidden;
    min-width: 0;
}

.featured-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.featured-card .book-cover {
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.featured-card .book-info {
    padding: 0;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.featured-card .book-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.featured-card .book-description {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.featured-card .book-actions {
    display: flex;
    gap: 12px;
}

.load-more-container {
    text-align: center;
}

/* ============================================
   Cart Sidebar
   ============================================ */

.cart-sidebar {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    max-width: 100%;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
}

.cart-sidebar.open {
    right: 0;
}

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

.cart-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cart-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-muted);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.close-btn:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.cart-item {
    display: flex;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-cover {
    width: 60px;
    height: 80px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.cart-item-info {
    flex: 1;
}

.cart-item-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.cart-item-author {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.cart-item-price {
    font-weight: 600;
    color: var(--primary);
}

.cart-item-remove {
    color: var(--text-muted);
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.cart-item-remove:hover {
    color: var(--danger);
}

.cart-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 0;
}

.cart-empty-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.cart-footer {
    padding: 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-card);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

#cartTotal {
    color: var(--primary);
    font-size: 1.25rem;
}

/* ============================================
   Modals
   ============================================ */

.modal {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 500px;
    width: 100%;
    border: 1px solid var(--border-color);
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal.open .modal-content {
    transform: scale(1);
}

.modal-content h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.25rem;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.lang-btn {
    padding: 14px 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--primary);
    background: var(--bg-card);
}

.lang-btn.active {
    border-color: var(--primary);
    background: var(--primary);
}

/* Book Detail Modal */
.book-modal .modal-content {
    max-width: 800px;
    padding: 0;
    overflow: hidden;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 10;
    background: var(--bg-card);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
}

.book-detail-cover {
    position: relative;
    background: var(--bg-elevated);
}

.book-detail-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-detail-info {
    padding: 32px;
}

.book-detail-info h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.book-detail-info .book-author {
    font-size: 1rem;
    margin-bottom: 16px;
}

.book-detail-info .book-rating {
    margin-bottom: 20px;
}

.book-detail-info .book-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.book-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
}

.book-meta-item {
    font-size: 0.85rem;
}

.book-meta-item span:first-child {
    color: var(--text-muted);
}

.book-meta-item span:last-child {
    color: var(--text-primary);
    font-weight: 500;
}

/* Language selector in book modal */
.modal-lang-selector {
    margin: 16px 0;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.lang-selector-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.lang-selector-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.lang-select-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-select-btn:hover {
    border-color: var(--primary-color);
    background: rgba(74, 144, 226, 0.1);
}

.lang-select-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.book-price-section {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.book-price-section .book-price {
    font-size: 2rem;
}

.book-actions {
    display: flex;
    gap: 12px;
}

/* ============================================
   Toast
   ============================================ */

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transition: var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--success);
    color: var(--success);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 2fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

.newsletter-form {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
}

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

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.newsletter-form .btn {
    padding: 12px 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .nav-main {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .book-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .book-detail-cover {
        height: 300px;
    }
    
    .featured-card {
        grid-template-columns: 1fr;
    }
    
    .featured-card .book-cover {
        height: 200px;
    }
}

@media (max-width: 768px) {
    .header-container {
        gap: 16px;
    }
    
    .search-container {
        display: none;
    }
    
    .hero {
        padding: calc(var(--header-height) + 48px) 24px 48px;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .filters-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .filter-group {
        width: 100%;
    }
    
    .filter-select {
        flex: 1;
    }
    
    .results-count {
        margin-left: 0;
    }
    
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .featured-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .language-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-elevated);
    color: var(--text-primary);
    padding: 16px 28px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    z-index: 2000;
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    font-weight: 500;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--success);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.2);
}

.toast.error {
    border-color: var(--danger);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.2);
}

/* ============================================
   Preview Modal
   ============================================ */

.preview-modal .modal-content {
    width: 90vw;
    max-width: 1000px;
    height: 85vh;
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-elevated);
}

.preview-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.preview-header .close-btn {
    position: static;
    background: transparent;
}

#previewFrame {
    flex: 1;
    width: 100%;
    height: 100%;
    background: #fff;
    border: none;
}