/* styles.css */
:root {
    --primary: #4361ee;
    --secondary: #3a0ca3;
    --accent: #f72585;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4cc9f0;
    --warning: #f8961e;
    --info: #4895ef;
    --gradient-start: #3a0ca3;
    --gradient-end: #4361ee;
    --text-light: #f8f9fa;
    --text-dark: #212529;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --border-radius: 12px;
    --border-radius-small: 6px;
  }
  
  /* Fuentes personalizadas */
  @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');
  
  /* Estilos base */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.7;
    overflow-x: hidden;
  }
  
  /* Encabezado con gradiente animado */
  header {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-size: 200% 200%;
    color: var(--text-light);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    animation: gradientBG 15s ease infinite;
  }
  
  @keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }
  
  header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Q50,80 0,100 Z" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 100% auto;
    background-repeat: no-repeat;
    background-position: bottom;
    opacity: 0.5;
  }
  
  h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    display: inline-block;
  }
  
  h1::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--accent);
    border-radius: 2px;
  }
  
  .subtitle {
    font-size: 1.4rem;
    opacity: 0.9;
    font-weight: 300;
    max-width: 800px;
    margin: 0 auto;
  }
  
  /* Contenedor principal */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }
  
  /* Secciones con efecto 3D */
  section {
    background: white;
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
  }
  
  section:hover {
    transform: translateY(-10px) scale(1.01);
    box-shadow: var(--shadow-hover);
  }
  
  section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent), var(--success));
  }
  
  /* Títulos */
  h2 {
    color: var(--secondary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid rgba(67, 97, 238, 0.2);
    font-size: 2rem;
    font-weight: 600;
    position: relative;
  }
  
  h2::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: var(--accent);
  }
  
  h3 {
    color: var(--primary);
    margin: 2rem 0 1rem;
    font-size: 1.5rem;
    font-weight: 500;
  }
  
  /* Listas */
  ul, ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
  }
  
  li {
    margin-bottom: 0.5rem;
    position: relative;
  }
  
  li::before {
    content: "•";
    color: var(--accent);
    font-weight: bold;
    display: inline-block;
    width: 1em;
    margin-left: -1em;
  }
  
  /* Código */
  code {
    font-family: 'Fira Code', monospace;
    background-color: rgba(67, 97, 238, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: var(--border-radius-small);
    color: var(--accent);
    font-size: 0.9em;
    font-weight: 500;
  }
  
  pre {
    font-family: 'Fira Code', monospace;
    background: #1e1e3f;
    color: #e1e1e6;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    line-height: 1.6;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    border-left: 4px solid var(--accent);
  }
  
  .code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #2d2d5a;
    color: #a5a5c9;
    padding: 0.7rem 1.5rem;
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
    font-size: 0.8rem;
    font-family: 'Poppins', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
  }
  
  /* Tarjetas de características */
  .feature-card {
    background: linear-gradient(145deg, #ffffff, #f0f4ff);
    border-left: 4px solid var(--primary);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }
  
  .feature-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-hover);
  }
  
  .feature-title {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
  }
  
  .feature-title::before {
    content: "✦";
    color: var(--accent);
    margin-right: 0.5rem;
    font-size: 1.2em;
  }
  
  /* Línea de tiempo - Versión sin JavaScript */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 20px;
  }
  
  .timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    border-radius: 3px;
    z-index: 1;
  }
  
  .timeline-item {
    padding: 15px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
    margin-bottom: 30px;
    opacity: 1;
    transform: translateY(0);
  }
  
  .timeline-item::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    right: -12px;
    background-color: white;
    border: 4px solid var(--accent);
    top: 15px;
    border-radius: 50%;
    z-index: 2;
    box-shadow: 0 0 0 4px rgba(247, 37, 133, 0.2);
  }
  
  .left {
    left: 0;
  }
  
  .right {
    left: 50%;
  }
  
  .left::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 22px;
    width: 0;
    z-index: 1;
    right: 30px;
    border: medium solid var(--primary);
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent var(--primary);
  }
  
  .right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 22px;
    width: 0;
    z-index: 1;
    left: 30px;
    border: medium solid var(--primary);
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--primary) transparent transparent;
  }
  
  .right::after {
    left: -12px;
  }
  
  .timeline-content {
    padding: 25px;
    background: white;
    position: relative;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
  }
  
  .timeline-content:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
  }
  
  .timeline-date {
    font-weight: bold;
    color: var(--accent);
    margin-bottom: 0.5rem;
    display: inline-block;
    background: rgba(247, 37, 133, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
  }
  
  /* Etiquetas de versión */
  .version-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--warning));
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-left: 0.8rem;
    vertical-align: middle;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }
  
  /* Pie de página */
  footer {
    background: linear-gradient(135deg, var(--dark), #343a40);
    color: var(--text-light);
    text-align: center;
    padding: 3rem 2rem;
    margin-top: 3rem;
    position: relative;
  }
  
  footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: linear-gradient(to right, var(--accent), var(--success));
  }
  
  footer p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
  }
  
  footer p:first-child {
    font-size: 1.2rem;
    font-weight: 500;
  }
  
  /* Efectos de scroll */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  section, .feature-card {
    animation: fadeInUp 0.6s ease forwards;
  }
  
  /* Botón de scroll to top */
  .scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
  }
  
  .scroll-top.visible {
    opacity: 1;
    visibility: visible;
  }
  
  .scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  }
  
  /* Responsive design */
  @media screen and (max-width: 768px) {
    h1 {
      font-size: 2.2rem;
    }
    
    .subtitle {
      font-size: 1.1rem;
    }
    
    .container {
      padding: 1.5rem;
    }
    
    section {
      padding: 1.8rem;
    }
    
    .timeline::after {
        left: 31px;
      }
      
      .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
      }
      
      .timeline-item::before {
        left: 60px;
        border: medium solid var(--primary);
        border-width: 10px 10px 10px 0;
        border-color: transparent var(--primary) transparent transparent;
      }
      
      .left::before, .right::before {
        border-width: 10px 10px 10px 0;
        border-color: transparent var(--primary) transparent transparent;
        left: 60px;
      }
      
      .right {
        left: 0%;
      }
      
      .right::after {
        left: 18px;
      }
    }
  
  @media screen and (max-width: 480px) {
    header {
      padding: 2rem 1rem;
    }
    
    h1 {
      font-size: 1.8rem;
    }
    
    .subtitle {
      font-size: 1rem;
    }
    
    h2 {
      font-size: 1.6rem;
    }
    
    h3 {
      font-size: 1.3rem;
    }
    
    .feature-card, .timeline-content {
      padding: 1.2rem;
    }
    
    pre {
      padding: 1rem;
      font-size: 0.8rem;
    }
  }