:root {
    --primary:    #007bff;
    --secondary:  #6c757d;
    --light-bg:   #f8f9fa;
    --dark-bg:    #343a40;
    --font-body:  'Roboto', sans-serif;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    font-family: var(--font-body);
    line-height: 1.6;
    scroll-behavior: smooth;
  }
  
  header .navbar {
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(8px);
  }
  
  .hero {
    position: relative;
    background: url('../images/bienvenida.jpg') center/cover no-repeat;
    height: 100vh;
  }
  .hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
  }
  .hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
  }
  
  .section {
    padding: 6rem 0;
  }
  .alt-bg {
    background: var(--light-bg);
  }
  
  .section-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--dark-bg);
  }
  
  .icon {
    font-size: 1.8rem;
    color: var(--primary);
    margin-right: 1rem;
  }
  
  .testimonial {
    margin-top: 2.5rem;
    font-style: italic;
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    color: var(--secondary);
  }
  
  .btn-primary {
    background: var(--primary);
    border: none;
    transition: background 0.3s ease;
  }
  .btn-primary:hover {
    background: darken(var(--primary), 10%);
  }
  
  .card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  }.whatsapp-float {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 60px;
    height: 60px;
    z-index: 1000;
  }
  
  .whatsapp-float img {
    width: 170%;
    height: 170%;
  }