@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

body {
    font-family: 'Inter', sans-serif;
}

/* Animación del Libro 3D */
@keyframes float {
  0% { transform: translateY(0px) rotateY(-20deg) rotateX(10deg); }
  50% { transform: translateY(-20px) rotateY(-25deg) rotateX(15deg); }
  100% { transform: translateY(0px) rotateY(-20deg) rotateX(10deg); }
}
.book-container {
  perspective: 2000px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 600px;
}
.book {
  width: 350px;
  height: 500px;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateY(-25deg) rotateX(10deg);
  transition: transform 0.8s ease;
  margin-left: 250px; /* Desplazado a la derecha para compensar el giro de páginas */
  background-color: #f9f9f9;
  border-radius: 0px 20px 20px 0px;
}

.book-page {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transform-style: preserve-3d;
  transform-origin: left;
  transition: transform 1.5s cubic-bezier(0.645, 0.045, 0.355, 1);
  z-index: 10;
}

/* Caras de la página */
.page-front, .page-back {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 30px;
  backface-visibility: hidden;
  border-radius: 2px 12px 12px 2px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-shadow: inset 3px 0 15px rgba(0,0,0,0.05);
}

.page-front {
  background: white;
  z-index: 2;
}

.page-back {
  background: #f9f9f9;
  transform: rotateY(180deg);
  z-index: 1;
}

/* Portada Especial */
.book-page.cover-page .page-front {
  background: linear-gradient(135deg, #50B2EA 0%, #2589bd 100%);
  color: white;
}

/* Estado volteado */
.book-page.flipped {
  transform: rotateY(-170deg);
}

/* Lomo del libro */
.book-spine {
  position: absolute;
  width: 40px;
  height: 100%;
  left: -20px;
  background: #1a6d9a;
  transform: rotateY(90deg);
  border-radius: 6px 0 0 6px;
}

/* Sombra dinámica */
.book-shadow {
  position: absolute;
  bottom: -60px;
  width: 120%;
  height: 60px;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0.2) 0%, transparent 70%);
  transform: rotateX(90deg);
  filter: blur(8px);
}

/* Media Query para móviles */
@media (max-width: 768px) {
  .book-container {
    height: 450px;
    perspective: 1500px;
  }
  .book {
    width: 220px;
    height: 310px;
    margin-left: 60px; /* Ajuste para móvil */
  }
  .page-front, .page-back {
    padding: 20px;
  }
  .book-spine {
    width: 30px;
    left: -15px;
  }
}

/* Utilidades de animación simple */
.animate-fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Estilos para el Navbar y Menú --- */
.nav-link {
    color: rgba(255, 255, 255, 0.85);
}

.nav-link:hover {
    color: #ffffff;
}

.logo-text {
    color: #1f2937; /* text-gray-900 - Oscuro por defecto */
}

.logo-span {
    color: #50B2EA !important;
}

/* Cuando el navbar tiene scroll (fondo blanco) */
.navbar-scrolled .nav-link {
    color: #4b5563; /* text-gray-600 */
}

.navbar-scrolled .nav-link:hover {
    color: #50B2EA;
}

.navbar-scrolled .logo-text {
    color: #1f2937; /* text-gray-900 */
}

/* Efecto para el botón del menú móvil en modo transparente */
#mobile-menu-btn {
    color: white;
}

.navbar-scrolled #mobile-menu-btn {
    color: #50B2EA;
}

/* --- Estilos para el Flipbook Interactivo (PDF) --- */
#flipbook {
    background-color: transparent;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.page {
    background-color: white;
    overflow: hidden;
    box-shadow: inset -5px 0 10px rgba(0,0,0,0.05);
}

.page canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

#flipbook-viewport {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

@media (max-width: 768px) {
    #demo-container {
        aspect-ratio: 3/4; /* Más alto para móviles */
    }
    
    #flipbook-viewport {
        padding: 0.5rem; /* Menos espacio en móvil */
    }
    
    #flipbook-controls {
        gap: 2rem;
        width: 100%;
        justify-content: center;
    }
    
    #page-info {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
    }
}

/* Personalización de la librería StPageFlip */
.stPageFlip {
    background-color: transparent !important;
}

.page.-left {
    border-right: 1px solid rgba(0,0,0,0.1);
}

.page.-right {
    border-left: 1px solid rgba(0,0,0,0.1);
}

/* Efecto de carga */
.processing-pdf {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}