/* ==================== Variables CSS ==================== */
:root {
    /* Colores principales */
    --primary-color: #D4AF37;
    --primary-dark: #B8962E;
    --secondary-color: #1a1a2e;
    --background-dark: #0f0f1e;
    --background-card: #16162a;
    
    /* Colores de texto */
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    
    /* Efectos */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.45);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Fuentes */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
}

/* ==================== Reset y Base ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--background-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: all var(--transition-fast);
}

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

/* ==================== Utilidades ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hidden {
    display: none !important;
}

/* ==================== Navegación ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(to bottom, rgba(15, 15, 30, 0.95), transparent);
    padding: var(--spacing-sm) 0;
    transition: background-color var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(15, 15, 30, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background-color: rgba(212, 175, 55, 0.1);
    color: var(--primary-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-icon {
    color: var(--text-primary);
    padding: var(--spacing-xs);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary-color);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--primary-color);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.05);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ==================== Hero Section ==================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: 
        linear-gradient(to bottom, rgba(15, 15, 30, 0.4), rgba(15, 15, 30, 0.9)),
        url('https://images.unsplash.com/photo-1507842217343-583bb7270b66?w=1920&h=1080&fit=crop') center/cover no-repeat;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(15, 15, 30, 0.8) 100%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(15, 15, 30, 0.6) 50%, var(--background-dark) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-lg);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    text-shadow: var(--shadow-lg);
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    text-shadow: var(--shadow-md);
}

/* ==================== Buscador ==================== */
.search-container {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 50px;
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-normal);
}

.search-box:focus-within {
    background-color: #ffffff;
    box-shadow: 0 8px 32px rgba(212, 175, 55, 0.3);
    transform: translateY(-2px);
}

.search-icon {
    color: var(--text-muted);
    margin-right: var(--spacing-sm);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1.1rem;
    color: var(--secondary-color);
    background: transparent;
    padding: var(--spacing-xs);
}

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

.search-btn {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.search-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
}

.search-btn:active {
    transform: scale(0.98);
}

/* Resultados de búsqueda (autocompletado) */
.search-results {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    backdrop-filter: blur(10px);
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.search-result-item:hover {
    background-color: rgba(212, 175, 55, 0.1);
}

.search-result-icon {
    width: 50px;
    height: 70px;
    background-color: var(--background-card);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.search-result-info {
    flex: 1;
    color: var(--secondary-color);
}

.search-result-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--secondary-color);
}

.search-result-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Filtros rápidos */
.quick-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-chip {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.filter-chip:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
}

.filter-chip.active {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

/* ==================== Secciones ==================== */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ==================== Carrusel ==================== */
.carousel-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.carousel-btn {
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.carousel-btn:hover {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    transform: scale(1.1);
}

.carousel-btn:active {
    transform: scale(0.95);
}

.carousel-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.carousel-btn:disabled:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: scale(1);
}

.carousel-wrapper {
    position: relative;
    overflow: hidden;
    margin: 0 -10px;
}

.carousel {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 10px;
    scrollbar-width: none;
}

.carousel::-webkit-scrollbar {
    display: none;
}

/* ==================== Tarjetas de Libro ==================== */
.book-card {
    flex: 0 0 220px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.book-cover {
    position: relative;
    width: 100%;
    height: 320px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--background-card);
}

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

.book-card:hover .book-cover img {
    transform: scale(1.1);
}

.book-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-md);
}

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

.book-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--primary-color);
    font-weight: 600;
}

.book-info {
    padding: 0 var(--spacing-xs);
}

.book-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==================== Grid de Resultados ==================== */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.search-info {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.btn-text {
    color: var(--primary-color);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.btn-text:hover {
    background-color: rgba(212, 175, 55, 0.1);
}

/* ==================== Colecciones ==================== */
.collections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.collection-card {
    position: relative;
    height: 200px;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.collection-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.collection-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    opacity: 0.8;
    transition: opacity var(--transition-normal);
}

.collection-card:hover .collection-bg {
    opacity: 1;
}

.collection-content {
    position: relative;
    z-index: 10;
    height: 100%;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.collection-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.collection-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.collection-info p {
    color: rgba(26, 26, 46, 0.9);
    font-size: 0.9rem;
}

.collection-count {
    font-weight: 600;
    color: var(--secondary-color);
}

/* ==================== Loading Spinner ==================== */
.loading-spinner {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== Modal ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    z-index: 10;
    background-color: var(--background-card);
    border-radius: 16px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.modal-close:hover {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-xl);
}

.book-detail {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
}

.book-detail-cover {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

.book-detail-info h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.book-detail-author {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.book-detail-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.book-detail-meta-item span {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.book-detail-meta-item strong {
    font-size: 1.1rem;
    color: var(--primary-color);
}

.book-detail-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.book-detail-actions {
    display: flex;
    gap: var(--spacing-md);
}

.btn-primary, .btn-secondary {
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
}

/* ==================== Paginación ==================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.pagination-btn {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.pagination-btn:hover {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

.pagination-btn.active {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

.pagination-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* ==================== Footer ==================== */
.footer {
    background-color: var(--secondary-color);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    font-family: var(--font-display);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

/* ==================== Responsive ==================== */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 4rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .search-input {
        font-size: 0.95rem;
    }
    
    .search-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }
    
    .book-card {
        flex: 0 0 150px;
    }
    
    .book-cover {
        height: 220px;
    }
    
    .collections-grid {
        grid-template-columns: 1fr;
    }
    
    .book-detail {
        grid-template-columns: 1fr;
    }
    
    .book-detail-cover {
        max-width: 300px;
        margin: 0 auto;
    }
    
    .modal-body {
        padding: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: 600px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .quick-filters {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }
    
    .filter-chip {
        white-space: nowrap;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
}