/* ============================================
   BIBLIOTECA DIGITAL - ESTILOS MODERNOS Y RESPONSIVOS
   ============================================ */

/* VARIABLES CSS */
:root {
    --color-primary: #760C28;
    --color-primary-dark: #5a091e;
    --color-primary-light: #9e4a6c;
    --color-accent: #c41e3a;
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-bg-light: #f8f9fa;
    --color-bg-white: #ffffff;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-info: #17a2b8;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.18);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    --font-primary: 'Cinzel', serif;
    --font-secondary: 'Lato', sans-serif;
}

/* RESET Y BASE */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    background-size: cover;
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* CONTENEDOR PRINCIPAL */
.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: relative;
}

/* HEADER */
.main-header {
    background: var(--color-bg-white);
    box-shadow: var(--shadow-md);
    border-bottom: 3px solid var(--color-primary);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 50px;
    width: auto;
    transition: transform var(--transition-normal);
}

.logo-img:hover {
    transform: scale(1.05);
}

.logo-container h1 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

/* MENÚ DE NAVEGACIÓN */
.main-nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.main-nav a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    padding: 0.625rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.main-nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.main-nav a:hover {
    color: var(--color-primary);
    background: var(--color-bg-light);
    transform: translateY(-2px);
}

.main-nav a:hover::before {
    width: 100%;
}

.main-nav a.active {
    color: var(--color-primary);
    background: var(--color-bg-light);
}

.main-nav a.active::before {
    width: 100%;
}

.btn-login {
    background: var(--color-primary);
    color: white !important;
    border: 2px solid var(--color-primary);
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

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

/* MENÚ MÓVIL */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    cursor: pointer;
    padding: 0.5rem;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 3px;
    transition: all var(--transition-normal);
}

.menu-toggle span:nth-child(2) {
    width: 20px;
}

.menu-toggle span:nth-child(3) {
    width: 15px;
}

/* HERO SECTION */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, rgba(118, 12, 40, 0.95) 0%, rgba(118, 12, 40, 0.85) 100%);
    border-radius: var(--radius-lg);
    margin: 1.5rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(50px, 50px); }
}

.hero h2 {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    color: var(--color-bg-white);
    margin-bottom: 1rem;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.btn-cta {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    padding: 0.875rem 2rem;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1.125rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.btn-cta:hover {
    background: #a52d34;
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

/* FOOTER */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--color-bg-white);
    font-size: 0.875rem;
    background: rgba(0, 0, 0, 0.3);
}

footer a {
    color: var(--color-bg-white);
    text-decoration: none;
    transition: color var(--transition-normal);
}

footer a:hover {
    color: var(--color-accent);
}

/* SECCIONES COMUNES */
.seccion {
    padding: 2rem 0;
}

.titulo-seccion {
    font-family: var(--font-primary);
    font-size: 2rem;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--color-primary);
}

/* GRID DE LIBROS */
.grid-libros {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.tarjeta-libro {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
}

.tarjeta-libro:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.portada-contenedor {
    position: relative;
    height: 400px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, white 100%);
}

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

.tarjeta-libro:hover img {
    transform: scale(1.08);
}

.info-libro {
    padding: 1.5rem;
}

.info-libro h3 {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.autor {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.autor::before {
    content: '✍️';
}

.categoria {
    display: inline-block;
    background: var(--color-bg-light);
    color: var(--color-primary);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.anio {
    color: var(--color-text-light);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.anio::before {
    content: '📅';
}

.vistas {
    color: var(--color-text-light);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.vistas::before {
    content: '👁️';
}

/* BOTONES DE ACCIÓN */
.acciones-tarjeta {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0 1rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-tarjeta {
    flex: 1;
    padding: 0.625rem 1rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

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

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

.btn-tarjeta.btn-editar {
    background: var(--color-info);
    color: white;
}

.btn-tarjeta.btn-editar:hover {
    background: #138496;
}

.btn-tarjeta.btn-eliminar {
    background: var(--color-danger);
    color: white;
}

.btn-tarjeta.btn-eliminar:hover {
    background: #c82333;
}

/* FILTROS Y BÚSQUEDA */
.contenedor-filtros {
    background: var(--color-bg-white);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.filtros {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.filtro-busqueda {
    flex: 1;
    min-width: 280px;
}

.filtro-busqueda input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.filtro-busqueda input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(118, 12, 40, 0.15);
}

.menu-categorias {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.cat-btn {
    background: var(--color-bg-white);
    color: var(--color-text);
    padding: 0.5rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 500;
}

.cat-btn:hover,
.cat-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* TARJETAS DE NOVEDADES */
.grid-novedades {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.tarjeta-novedad {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.tarjeta-novedad:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.imagen-novedad {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, white 100%);
}

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

.tarjeta-novedad:hover .imagen-novedad img {
    transform: scale(1.08);
}

.etiqueta {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--color-accent);
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
}

.contenido-novedad {
    padding: 1.5rem;
}

.contenido-novedad h3 {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.contenido-novedad p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.leer-mas {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-normal);
}

.leer-mas:hover {
    color: var(--color-primary-dark);
}

/* NOTICIAS */
.grid-noticias {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.tarjeta-noticia {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.tarjeta-noticia:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.tarjeta-noticia img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.noticia-cuerpo {
    padding: 1.5rem;
}

.fecha-noticia {
    display: inline-block;
    background: var(--color-bg-light);
    color: var(--color-primary);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.noticia-cuerpo h3 {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.noticia-cuerpo p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.link-noticia {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-normal);
}

.link-noticia:hover {
    color: var(--color-accent);
}

/* AUDIOBOOKS */
.grid-audiolibros {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.tarjeta-audio {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.tarjeta-audio:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.portada-audio {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.tarjeta-audio:hover .portada-audio img {
    transform: scale(1.1);
}

.btn-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.btn-play:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.btn-play::after {
    content: '▶';
    color: var(--color-primary);
    font-size: 1.5rem;
}

.info-audio {
    padding: 1.5rem;
}

.info-audio h3 {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.duracion {
    color: var(--color-text-light);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.duracion::before {
    content: '⏱️';
}

/* FORMULARIOS */
.form-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-secondary);
    transition: all var(--transition-normal);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(118, 12, 40, 0.15);
}

.btn-submit {
    width: 100%;
    background: var(--color-primary);
    color: white;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

/* MENSAJES DE ERROR Y ÉXITO */
.mensaje {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    text-align: center;
    font-weight: 500;
}

.mensaje.exito {
    background: var(--color-success);
    color: white;
}

.mensaje.error {
    background: var(--color-danger);
    color: white;
}

.mensaje.warning {
    background: var(--color-warning);
    color: var(--color-text);
}

/* ============================================
   MEDIA QUERIES - DISEÑO RESPONSIVO
   ============================================ */

/* TABLETS (768px - 1024px) */
@media (max-width: 1024px) {
    .container {
        width: 95%;
    }

    .logo-container h1 {
        font-size: 1.25rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .grid-libros {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.25rem;
    }

    .grid-novedades,
    .grid-noticias,
    .grid-audiolibros {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.25rem;
    }
}

/* TABLETS PEQUEÑOS Y MÓVILES EN HORIZONTAL (480px - 767px) */
@media (max-width: 767px) {
    .container {
        width: 100%;
        border-radius: 0;
    }

    .header-flex {
        padding: 0.75rem;
    }

    .main-nav {
        display: none;
        position: fixed;
        top: 70px;
        right: 0;
        background: var(--color-bg-white);
        flex-direction: column;
        padding: 1rem;
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        box-shadow: var(--shadow-xl);
        z-index: 999;
    }

    .main-nav.show {
        display: flex;
    }

    .main-nav a {
        width: 100%;
        text-align: center;
        padding: 0.75rem 0;
    }

    .menu-toggle {
        display: flex;
        align-items: center;
    }

    .logo-container h1 {
        font-size: 1.125rem;
    }

    .grid-libros {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
        padding: 0.5rem;
    }

    .grid-novedades,
    .grid-noticias,
    .grid-audiolibros {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0.5rem;
    }

    .hero {
        padding: 2.5rem 1.5rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .btn-cta {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

/* MÓVILES EN VERTICAL (max-width: 479px) */
@media (max-width: 479px) {
    .header-flex {
        padding: 0.5rem 0.75rem;
    }

    .logo-img {
        height: 40px;
    }

    .logo-container h1 {
        font-size: 1rem;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .hero h2 {
        font-size: 1.25rem;
    }

    .btn-cta {
        width: 100%;
        padding: 0.75rem 1.25rem;
    }

    .tarjeta-libro,
    .tarjeta-novedad,
    .tarjeta-noticia,
    .tarjeta-audio {
        border-radius: var(--radius-md);
    }

    .portada-contenedor,
    .imagen-novedad {
        height: 250px;
    }

    .portada-audio {
        height: 180px;
    }

    .btn-play {
        width: 50px;
        height: 50px;
    }

    .btn-play::after {
        font-size: 1.25rem;
    }
}

/* ANIMACIONES */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* UTILIDADES */
.text-truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.line-clamp {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* SCROLLBAR PERSONALIZADO */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* SELECCIÓN */
::selection {
    background: var(--color-primary);
    color: white;
}

/* LOADING SPINNER */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(118, 12, 40, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}