/* ============================================
   Estilos específicos de libros.html
   ============================================ */

/* Estilos del body específicos para esta página */
body {
    background-color: var(--color-gray-50);
    padding-top: 70px; /* Espacio para el menú fijo */
}

/* Responsive: Menú en móviles */
@media (max-width: 640px) {
    body {
        padding-top: 60px;
    }
}

/* ============================================
   Header
   ============================================ */
.header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    box-shadow: var(--shadow-md);
}

.header__title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.header__subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
}

@media (min-width: 768px) {
    .header__title {
        font-size: 2.5rem;
    }
}

/* ============================================
   Main
   ============================================ */
.main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

/* ============================================
   Controles (Búsqueda y Filtros)
   ============================================ */
.controls {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

.search-box {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    font-size: 1rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    font-size: 1.25rem;
}

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

.filter-label {
    font-weight: 500;
    color: var(--color-gray-700);
    white-space: nowrap;
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9375rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--border-radius-md);
    background: white;
    color: var(--color-gray-800);
    cursor: pointer;
    transition: border-color var(--transition-base);
    min-width: 200px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ============================================
   Estadísticas
   ============================================ */
.stats {
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.stats__count {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 1.125rem;
}

/* ============================================
   Grid de Libros
   ============================================ */
.books-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 640px) {
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .books-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .books-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================
   Tarjeta de Libro
   ============================================ */
.book-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.book-card__cover {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    background: var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--color-gray-400);
}

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

.book-card__body {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-card__title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card__author {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: auto;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-gray-200);
}

.book-card__badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.book-card__year {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-left: auto;
}

.book-card__btn-frases {
    width: 100%;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.book-card__btn-frases:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.book-card__btn-frases:active {
    transform: translateY(0);
}

.book-card__btn-frases:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgb(245 158 11 / 0.3);
}

/* ============================================
   Loading
   ============================================ */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--color-gray-600);
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* ============================================
   No Results
   ============================================ */
.no-results {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-gray-600);
}

.no-results.hidden {
    display: none;
}

.btn-clear {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-base);
}

.btn-clear:hover {
    background: var(--color-primary-dark);
}

.btn-clear:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.3);
}

/* ============================================
   Modal
   ============================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal[hidden],
.modal.hidden {
    display: none !important;
}

.modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal__content {
    position: relative;
    background: white;
    border-radius: var(--border-radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    z-index: 1;
    animation: modalFadeIn var(--transition-base);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal__close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-gray-100);
    border-radius: 50%;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-base);
    z-index: 2;
}

.modal__close:hover {
    background: var(--color-gray-200);
}

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

.modal__cover {
    width: 100%;
    max-width: 300px;
    margin: 0 auto var(--spacing-lg);
    display: block;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.modal__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.modal__author {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
}

.modal__section {
    margin-bottom: var(--spacing-lg);
}

.modal__section-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-sm);
}

.modal__section-content {
    color: var(--color-gray-700);
    line-height: 1.7;
}

.modal__badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.modal__badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    background: var(--color-primary);
    color: white;
}

/* ============================================
   Frases Container
   ============================================ */
.frases-container {
    max-height: 60vh;
    overflow-y: auto;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.frase-item {
    background: var(--color-gray-50);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: background-color var(--transition-base), transform var(--transition-base);
}

.frase-item:hover {
    background: var(--color-gray-100);
    transform: translateX(4px);
}

.frase-item__text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-gray-800);
    margin: 0;
    font-style: italic;
}

.frase-item:last-child {
    margin-bottom: 0;
}


/* ============================================
   Responsive
   ============================================ */
@media (max-width: 639px) {
    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-select {
        width: 100%;
    }

    .modal__content {
        max-height: 95vh;
    }
}