@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700;900&family=Inter:wght@300;400;500;600;700&display=swap');

  :root {
    --bg-dark: #0a0e1a;
    --bg-library: #1a1f2e;
    --shelf-wood: #2c1810;
    --shelf-shadow: #1a0f08;
    --gold: #d4af37;
    --gold-light: #f4e4bc;
    --blue-accent: #4a9eff;
    --green-accent: #52e5a8;
    --purple-accent: #a78bfa;
    --pink-accent: #f472b6;
    --text-light: #f1f5f9;
    --text-muted: #94a3b8;
    --card-bg: rgba(26, 31, 46, 0.95);
  }

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

  body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(180deg, #0a0e1a 0%, #1a1f2e 50%, #0a0e1a 100%);
    color: var(--text-light);
    overflow-x: hidden;
    min-height: 100vh;
  }

  /* Loading Screen */
  .loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.8s ease, visibility 0.8s ease;
  }

  .loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
  }

  .loader-book {
    width: 60px;
    height: 80px;
    position: relative;
    animation: bookFlip 2s infinite;
  }

  @keyframes bookFlip {
    0%, 100% { transform: rotateY(0deg); }
    50% { transform: rotateY(180deg); }
  }

  .loader-book::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--gold) 50%, var(--gold-light) 50%);
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(212, 175, 55, 0.3);
  }

  /* Hero Library Section */
  .hero-library {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1200px;
    overflow: hidden;
  }

  /* Animated Background Particles */
  .particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
  }

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--gold-light);
    border-radius: 50%;
    opacity: 0;
    animation: float 20s infinite linear;
  }

  @keyframes float {
    0% {
      transform: translateY(100vh) translateX(0);
      opacity: 0;
    }
    10% {
      opacity: 0.6;
    }
    90% {
      opacity: 0.6;
    }
    100% {
      transform: translateY(-100vh) translateX(100px);
      opacity: 0;
    }
  }

  /* Main Library Container */
  .library-container {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem;
  }

  .main-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 50%, var(--gold-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 20px rgba(212, 175, 55, 0.3);
    animation: shimmer 3s ease-in-out infinite;
  }

  @keyframes shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
  }

  .subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-weight: 300;
  }

  /* 3D Bookshelf */
  .bookshelf {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    transform-style: preserve-3d;
    transform: rotateX(5deg);
    transition: transform 0.3s ease;
  }

  .shelf {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr)); /* Reducido de 120px a 60px */
    gap: 10px; /* Reducido de 15px a 10px para mejor espaciado */
    background-image: url('img/estante2.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center top;
    padding: 50px;
    border-radius: 8px;
    box-shadow: 
        inset 0 2px 5px rgba(0,0,0,0.3),
        0 5px 15px rgba(0,0,0,0.4);
    /* Efecto de madera 3D */
    border-top: 2px solid rgba(255,255,255,0.2);
    border-bottom: 2px solid rgba(0,0,0,0.2);
    margin-bottom: 30px;
    position: relative;
  }

  .shelf:before {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(45deg, 
        rgba(0,0,0,0.2) 0%,
        rgba(0,0,0,0.1) 100%);
    transform: skewX(45deg);
  }

  /* Interactive Books */
  .book {
    width: 50px; /* Añadir ancho fijo */
    height: 240px;
    background: linear-gradient(135deg, #2563eb, #1e40af);
    border-radius: 3px 8px 8px 3px;
    position: relative;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    box-shadow: 
      -5px 5px 10px rgba(0,0,0,0.3),
      inset -2px 0 5px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem; /* Reducido de 1rem a 0.5rem */
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transform: perspective(1000px) rotateY(-5deg);
  }

  .book::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s;
  }

  .book:hover::before {
    transform: translateX(100%);
  }

  .book:hover {
    transform: translateY(-10px) rotateY(-5deg) scale(1.05);
    box-shadow: 
      -10px 15px 25px rgba(0,0,0,0.4),
      0 0 30px rgba(var(--book-glow), 0.3);
  }

  /* Estilos específicos para cada libro */
  .book-datos {
    background-image: url('img/libro1.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-mitos {
    background-image: url('img/libro2.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-politicas {
    background-image: url('img/libro3.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-casos {
    background-image: url('img/libro4.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-practicas {
    background-image: url('img/libro5.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-recursos {
    background-image: url('img/libro6.jpg');
    border-left: 3px solid rgba(255,255,255,0.2);
  }

  .book-spine {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-weight: 600;
    font-size: 0.8rem; /* Reducido de 0.9rem para mejor ajuste */
    color: white;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
    letter-spacing: 0.5px; /* Ajustado para mejor legibilidad */
  }

  .book-icon {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    opacity: 0.7;
  }

  /* Decorative Books */
  .book-decorative {
    width: 35px; /* Más estrechos que los libros principales */
    height: 220px; /* Altura variable */
    background: linear-gradient(135deg, var(--bg-library), var(--bg-dark));
    border-left: 2px solid rgba(255,255,255,0.1);
    cursor: default; /* Quita el cursor pointer */
    transform: perspective(1000px) rotateY(-5deg);
  }

  .book-decorative:nth-child(odd) {
    height: 200px; /* Altura alternada */
    background: linear-gradient(135deg, #2c3e50, #1a1f2e);
  }

  .book-decorative:nth-child(3n) {
    height: 230px;
    background: linear-gradient(135deg, #34495e, #2c3e50);
  }

  .book-decorative:hover {
    transform: none; /* Elimina la animación al hover */
    box-shadow: none;
  }

  /* Floating Navigation */
  .floating-nav {
    position: fixed;
    top: 50%;
    right: 30px;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 15px;
    opacity: 0;
    transition: opacity 0.5s ease;
  }

  .floating-nav.visible {
    opacity: 1;
  }

  .nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
  }

  .nav-dot:hover,
  .nav-dot.active {
    background: var(--gold);
    transform: scale(1.5);
  }

  .nav-dot::before {
    content: attr(data-section);
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--card-bg);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .nav-dot:hover::before {
    opacity: 1;
  }

  /* Content Sections */
  .content-section {
    min-height: 100vh;
    padding: 80px 20px;
    position: relative;
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .content-section.visible {
    opacity: 1;
    transform: translateY(0);
  }

  .section-container {
    max-width: 1200px;
    margin: 0 auto;
  }

  .section-header {
    text-align: center;
    margin-bottom: 3rem;
  }

  .section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gold);
    border-radius: 2px;
  }

  /* Interactive Cards */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 2rem;
  }

  .interactive-card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(212, 175, 55, 0.2);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
  }

  .interactive-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(212, 175, 55, 0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
  }

  .interactive-card:hover::before {
    opacity: 1;
  }

  .interactive-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--gold);
    box-shadow: 0 20px 40px rgba(212, 175, 55, 0.2);
  }

  .card-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 1rem;
    fill: var(--gold);
  }

  .card-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
  }

  .card-content {
    color: var(--text-muted);
    line-height: 1.6;
  }

  /* Stats Counter */
  .stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin: 3rem 0;
  }

  .stat-card {
    text-align: center;
    padding: 2rem;
    background: rgba(212, 175, 55, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    position: relative;
    overflow: hidden;
  }

  .stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--gold);
    font-family: 'Playfair Display', serif;
    display: block;
    margin-bottom: 0.5rem;
  }

  .stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
  }

  /* Timeline */
  .timeline {
    position: relative;
    padding: 2rem 0;
  }

  .timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--gold) 0%, transparent 100%);
  }

  .timeline-item {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    position: relative;
  }

  .timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
    margin-left: 0;
  }

  .timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 0;
  }

  .timeline-content {
    width: 45%;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    position: relative;
    transition: all 0.3s ease;
  }

  .timeline-content:hover {
    transform: scale(1.05);
    border-color: var(--gold);
  }

  .timeline-date {
    color: var(--gold);
    font-weight: 600;
    margin-bottom: 0.5rem;
  }

  .timeline-dot {
    position: absolute;
    left: 50%;
    top: 20px;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--gold);
    border-radius: 50%;
    border: 3px solid var(--bg-dark);
    z-index: 1;
  }

  /* Mobile Responsive */
  @media (max-width: 768px) {
    .bookshelf {
      transform: none;
    }

    .shelf {
      grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
      gap: 8px;
    }

    .floating-nav {
      display: none;
    }

    .timeline::before {
      left: 20px;
    }

    .timeline-item {
      justify-content: flex-start;
      padding-left: 60px;
    }

    .timeline-content {
      width: 100%;
    }

    .timeline-dot {
      left: 20px;
    }

    .stats-container {
      grid-template-columns: 1fr;
    }

    .book {
      width: 40px;
      height: 200px;
    }
  }

  /* Scroll Indicator */
  .scroll-indicator {
    position: absolute;
    bottom: 0.01rem; /* Ajustado desde su valor original para subirlo */
    left: 50%;
    transform: translateY(-100px);
    animation: bounce 2s infinite;
  }

  @keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
  }

  .scroll-text {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.1rem; /* Reducido el espacio entre el texto y la flecha */
  }

  .scroll-arrow {
    width: 30px;
    height: 30px;
    border-right: 2px solid var(--gold);
    border-bottom: 2px solid var(--gold);
    transform: rotate(45deg);
    margin: 0 auto;
  }

  /* Progress Bar */
  .progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(212, 175, 55, 0.2);
    z-index: 1000;
  }

  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 100%);
    width: 0%;
    transition: width 0.3s ease;
  }

  /* Back to Top Button */
  .back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
  }

  .back-to-top.visible {
    opacity: 1;
    visibility: visible;
  }

  .back-to-top:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.4);
  }

  .back-to-top svg {
    width: 20px;
    height: 20px;
    fill: var(--bg-dark);
  }