/* ===== ESTILOS GENERALES ===== */
:root {
    --baby-blue: #e3f2fd;
    --baby-blue-dark: #bbdefb;
    --baby-blue-darker: #90caf9;
    --pastel-blue: #f0f8ff;
    --pastel-blue-dark: #e1f5fe;
    --white: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #546e7a;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-hover: rgba(0, 0, 0, 0.12);
    --border-color: #e1e8ed;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    color: var(--text-dark);
    background-color: var(--pastel-blue);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER ===== */
.main-header {
    background-color: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo-section {
    display: flex;
    flex-direction: column;
}

.logo {
    font-family: 'Roboto Slab', serif;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--baby-blue-darker);
    letter-spacing: 1px;
}

.tagline {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: -5px;
}

.main-nav .nav-list {
    display: flex;
    list-style: none;
    gap: 25px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--baby-blue);
    color: var(--baby-blue-darker);
}

/* ===== BARRA DE BÚSQUEDA ===== */
.search-section {
    background-color: var(--baby-blue);
    padding: 25px 0;
    border-bottom: 1px solid var(--border-color);
}

.search-container {
    position: relative;
    max-width: 700px;
    margin: 0 auto 15px;
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--baby-blue-darker);
    font-size: 1.2rem;
}

#search-input {
    width: 100%;
    padding: 16px 20px 16px 55px;
    border: 2px solid var(--baby-blue-dark);
    border-radius: 50px;
    font-size: 1rem;
    background-color: var(--white);
    transition: all 0.3s ease;
}

#search-input:focus {
    outline: none;
    border-color: var(--baby-blue-darker);
    box-shadow: 0 0 0 3px rgba(144, 202, 249, 0.2);
}

.search-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--baby-blue-darker);
    color: white;
    border: none;
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-btn:hover {
    background-color: #64b5f6;
}

.search-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.search-tag {
    background-color: var(--white);
    color: var(--text-dark);
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--baby-blue-dark);
}

.search-tag:hover, .search-tag.active {
    background-color: var(--baby-blue-darker);
    color: white;
    border-color: var(--baby-blue-darker);
}

/* ===== SECCIONES DE LIBROS ===== */
.main-content {
    padding: 30px 20px;
}

.books-section {
    margin-bottom: 50px;
}

.section-title {
    font-family: 'Roboto Slab', serif;
    font-size: 1.8rem;
    margin-bottom: 25px;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

/* ===== TARJETAS DE LIBROS ===== */
.book-card {
    background-color: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
}

.book-cover {
    height: 160px;
    background-color: var(--baby-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
}

.book-cover::after {
    content: "";
    position: absolute;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2390caf9"><path d="M18 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V4a2 2 0 0 0-2-2zM6 4h5v8l-2.5-1.5L6 12V4z"/></svg>');
    background-size: contain;
    opacity: 0.7;
}

.book-title {
    font-family: 'Roboto Slab', serif;
    font-size: 1.3rem;
    color: var(--text-dark);
    text-align: center;
    line-height: 1.3;
    max-width: 90%;
}

.book-details {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-author {
    color: var(--baby-blue-darker);
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.book-synopsis {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 15px;
    flex-grow: 1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.book-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 15px;
}

.book-tag {
    background-color: var(--baby-blue);
    color: var(--baby-blue-darker);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.book-stats {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: auto;
}

.download-btn {
    background-color: var(--baby-blue-darker);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 0.9rem;
}

.download-btn:hover {
    background-color: #64b5f6;
}

/* ===== CATEGORÍAS ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.category-card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 25px 20px;
    text-align: center;
    box-shadow: 0 4px 12px var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-color);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
    background-color: var(--baby-blue);
}

.category-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.category-count {
    color: var(--baby-blue-darker);
    font-weight: 600;
    font-size: 0.9rem;
}

/* ===== CONTROLES DE LIBROS ===== */
.books-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

#sort-select {
    padding: 8px 15px;
    border: 1px solid var(--baby-blue-dark);
    border-radius: 6px;
    background-color: var(--white);
    color: var(--text-dark);
    font-family: 'Open Sans', sans-serif;
}

.results-info {
    color: var(--text-light);
    font-size: 0.95rem;
}

.load-more-container {
    text-align: center;
    margin-top: 40px;
}

.load-more-btn {
    background-color: var(--baby-blue);
    color: var(--baby-blue-darker);
    border: 2px solid var(--baby-blue-dark);
    padding: 12px 35px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.load-more-btn:hover {
    background-color: var(--baby-blue-darker);
    color: white;
    border-color: var(--baby-blue-darker);
}

/* ===== SECCIÓN QUIÉNES SOMOS ===== */
.about-section {
    background-color: var(--white);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 12px var(--shadow);
    margin-top: 40px;
}

.about-content {
    margin-bottom: 30px;
}

.about-content p {
    margin-bottom: 15px;
    color: var(--text-light);
}

.contact-info {
    background-color: var(--baby-blue);
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 20px;
    border-left: 4px solid var(--baby-blue-darker);
}

.external-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.external-link {
    background-color: var(--pastel-blue-dark);
    border: 1px solid var(--baby-blue-dark);
    border-radius: 10px;
    padding: 20px;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.external-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
    background-color: var(--baby-blue);
}

.external-link i {
    font-size: 2.5rem;
    color: var(--baby-blue-darker);
    margin-bottom: 15px;
}

.external-link span {
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.external-link p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== FOOTER ===== */
.main-footer {
    background-color: var(--text-dark);
    color: white;
    padding-top: 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    padding-bottom: 30px;
}

.footer-section h3, .footer-section h4 {
    color: var(--baby-blue);
    margin-bottom: 15px;
    font-family: 'Roboto Slab', serif;
}

.footer-tagline {
    font-style: italic;
    color: #b0bec5;
    margin-top: 5px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: #cfd8dc;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    background-color: rgba(0, 0, 0, 0.2);
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #b0bec5;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.footer-note {
    color: var(--baby-blue);
    font-size: 0.85rem;
}

/* ===== MODAL DE DETALLES ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--white);
    border-radius: 10px;
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    z-index: 10;
}

.close-modal:hover {
    color: var(--text-dark);
}

.modal-body {
    padding: 30px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .main-nav .nav-list {
        gap: 10px;
    }
    
    .nav-link {
        padding: 6px 10px;
        font-size: 0.9rem;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .books-controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .search-container {
        margin-bottom: 20px;
    }
    
    .search-btn {
        position: relative;
        right: 0;
        top: 0;
        transform: none;
        width: 100%;
        margin-top: 10px;
    }
    
    .logo {
        font-size: 1.8rem;
    }
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    font-style: italic;
    grid-column: 1 / -1;
}