/* ================================================
   DISEÑO MODERNO COMPLETO - VERSIÓN FINAL
   Sistema de Biblioteca Bibliocusiana
   ================================================ */

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

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

/* === HEADER MODERNO === */
.header-biblioteca {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 35px;
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
    animation: slideDown 0.6s ease-out;
    position: relative;
    overflow: hidden;
}

.header-biblioteca::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

.header-biblioteca h1 {
    font-size: 36px !important;
    font-weight: 800 !important;
    color: white !important;
    text-shadow: 0 3px 6px rgba(0,0,0,0.3);
    margin-bottom: 12px !important;
    position: relative;
    z-index: 1;
}

.header-biblioteca .welcome-text {
    font-size: 19px !important;
    color: rgba(255,255,255,0.95) !important;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* === NAVEGACIÓN MODERNA === */
.navegacion-acciones {
    background: white;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    animation: slideDown 0.8s ease-out;
}

.navegacion-acciones > div {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

/* === BOTONES MODERNOS === */
.btn-accion {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    color: white !important;
    border: none !important;
    border-radius: 12px !important;
    padding: 14px 28px !important;
    font-size: 15px !important;
    font-weight: 700 !important;
    cursor: pointer !important;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    position: relative !important;
    overflow: hidden !important;
}

.btn-accion::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-accion:hover::before {
    width: 300px;
    height: 300px;
}

.btn-accion:hover {
    transform: translateY(-3px) !important;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5) !important;
}

.btn-accion.is-active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%) !important;
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.5) !important;
    transform: scale(1.05) !important;
}

/* === BUSCADOR MODERNO === */
.buscador-libros {
    position: relative;
    margin-bottom: 28px;
    animation: slideDown 1s ease-out;
}

.buscador-libros span {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    color: #667eea;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 1;
}

.buscador-libros input {
    width: 100% !important;
    padding: 18px 24px 18px 58px !important;
    border: 2px solid #e0e7ff !important;
    border-radius: 16px !important;
    font-size: 16px !important;
    background: white !important;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08) !important;
    transition: all 0.3s ease !important;
}

.buscador-libros input:focus {
    border-color: #667eea !important;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.25) !important;
    outline: none !important;
    transform: translateY(-1px);
}

.buscador-libros input:focus + span {
    color: #764ba2;
    transform: translateY(-50%) scale(1.1);
}

/* === GRID DE LIBROS === */
.libros-grid {
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)) !important;
    gap: 28px !important;
    padding: 12px 0 !important;
}

/* === TARJETAS DE LIBROS 3D === */
.libro-tarjeta {
    background: white !important;
    border-radius: 18px !important;
    padding: 18px !important;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1) !important;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1) !important;
    cursor: pointer !important;
    position: relative !important;
    overflow: visible !important;
    animation: fadeIn 0.6s ease-out !important;
}

.libro-tarjeta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #f5576c);
    border-radius: 18px 18px 0 0;
    transform: scaleX(0);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.libro-tarjeta:hover::before {
    transform: scaleX(1);
}

.libro-tarjeta:hover {
    transform: translateY(-12px) scale(1.03) !important;
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3) !important;
    z-index: 10 !important;
}

/* === PORTADAS CON EFECTOS === */
.portada-contenedor {
    position: relative;
    width: 100%;
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 14px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.portada-contenedor::after {
    content: '👁️ Ver más';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 14px;
    background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
    color: white;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.libro-tarjeta:hover .portada-contenedor::after {
    opacity: 1;
}

.portada-libro {
    width: 100% !important;
    height: 280px !important;
    object-fit: cover !important;
    border-radius: 14px !important;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1) !important;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
}

.portada-libro[src=""], .portada-libro[src*="portada-no-disponible"] {
    animation: shimmer 1.5s infinite;
}

.libro-tarjeta:hover .portada-libro {
    transform: scale(1.08) rotate(1deg) !important;
    filter: brightness(1.1);
}

/* === INFORMACIÓN DEL LIBRO === */
.libro-tarjeta h4 {
    font-size: 16px !important;
    font-weight: 700 !important;
    color: #2c3e50 !important;
    margin: 0 0 8px 0 !important;
    line-height: 1.4 !important;
    min-height: 44px;
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
}

.libro-tarjeta p {
    font-size: 14px !important;
    color: #7f8c8d !important;
    margin: 0 0 12px 0 !important;
    font-style: italic !important;
}

/* === BADGES MEJORADOS === */
.badge {
    display: inline-block !important;
    padding: 7px 16px !important;
    border-radius: 25px !important;
    font-size: 12px !important;
    font-weight: 700 !important;
    text-transform: uppercase !important;
    letter-spacing: 0.8px !important;
    margin: 8px 0 !important;
}

.badge.disponible {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%) !important;
    color: white !important;
    box-shadow: 0 3px 12px rgba(56, 239, 125, 0.4) !important;
}

.badge.prestado {
    background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%) !important;
    color: white !important;
    box-shadow: 0 3px 12px rgba(238, 9, 121, 0.4) !important;
}

/* === BOTONES EN TARJETAS === */
.btn-prestar, .libro-accion button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    color: white !important;
    border: none !important;
    border-radius: 12px !important;
    padding: 12px !important;
    width: 100% !important;
    font-size: 14px !important;
    font-weight: 700 !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4) !important;
    margin-top: 4px !important;
}

.btn-prestar:hover, .libro-accion button:hover {
    transform: translateY(-3px) !important;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.5) !important;
}

/* === FILTROS AVANZADOS === */
.filtros-avanzados {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 28px;
    animation: slideDown 1.2s ease-out;
}

.filtros-avanzados select {
    flex: 1;
    min-width: 200px;
    padding: 14px 18px;
    border: 2px solid #e0e7ff;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.filtros-avanzados select:hover {
    border-color: #667eea;
    transform: translateY(-1px);
}

.filtros-avanzados select:focus {
    outline: none;
    border-color: #764ba2;
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.25);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .header-biblioteca h1 {
        font-size: 26px !important;
    }

    .header-biblioteca .welcome-text {
        font-size: 16px !important;
    }

    .libros-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)) !important;
        gap: 20px !important;
    }

    .navegacion-acciones > div {
        flex-direction: column;
    }

    .btn-accion {
        width: 100%;
    }
}

/* === CARGA DE IMÁGENES === */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.portada-libro.loading {
    animation: pulse 1.5s ease-in-out infinite;
}