:root {
      --primary-blue: #002d8a;
      --light-blue: #0066cc;
      --accent-blue: #00abf0;
      --text-light: #ccc;
      --white: #ffffff;
      --shadow: rgba(0, 45, 138, 0.2);
      --dark-text: #2c3e50;
      --success-green: #27ae60;
      --gradient-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      --card-shadow: 0 15px 35px rgba(0, 45, 138, 0.1);
      --hover-shadow: 0 20px 45px rgba(0, 45, 138, 0.2);
    }

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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: var(--gradient-bg);
      color: var(--dark-text);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .hero-section {
      background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
      padding: 60px 20px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
      animation: float 20s infinite linear;
    }

    @keyframes float {
      0% { transform: translateY(0px) rotate(0deg); }
      100% { transform: translateY(-100vh) rotate(360deg); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .main-title {
      font-size: 3.5rem;
      color: var(--white);
      margin-bottom: 20px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
      animation: slideInDown 1s ease-out;
    }

    .subtitle {
      font-size: 1.3rem;
      color: rgba(255, 255, 255, 0.9);
      margin-bottom: 40px;
      font-weight: 300;
      animation: slideInUp 1s ease-out 0.3s both;
    }

    @keyframes slideInDown {
      from {
        opacity: 0;
        transform: translateY(-50px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes slideInUp {
      from {
        opacity: 0;
        transform: translateY(50px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 60px 20px;
    }

    .section-title {
      text-align: center;
      font-size: 2.5rem;
      color: var(--primary-blue);
      margin-bottom: 50px;
      position: relative;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background: linear-gradient(90deg, var(--accent-blue), var(--light-blue));
      border-radius: 2px;
    }

    .baterias-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 40px;
      margin-bottom: 80px;
    }

    .bateria-card {
      background: var(--white);
      border-radius: 20px;
      padding: 30px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      position: relative;
      overflow: hidden;
      animation: fadeInUp 0.8s ease-out;
    }

    .bateria-card:nth-child(2) { animation-delay: 0.2s; }
    .bateria-card:nth-child(3) { animation-delay: 0.4s; }

    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .bateria-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
      transition: left 0.6s;
    }

    .bateria-card:hover::before {
      left: 100%;
    }

    .bateria-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--hover-shadow);
    }

    .bateria-image {
      width: 100%;
      max-width: 240px;
      height: 200px;
      object-fit: contain;
      margin-bottom: 25px;
      transition: transform 0.3s ease;
    }

    .bateria-card:hover .bateria-image {
      transform: scale(1.05);
    }

    .precio-badge {
      background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
      color: var(--white);
      padding: 12px 24px;
      border-radius: 25px;
      font-weight: bold;
      font-size: 1.1rem;
      margin-bottom: 20px;
      display: inline-block;
      box-shadow: 0 4px 15px rgba(0, 45, 138, 0.3);
      transition: transform 0.2s ease;
    }

    .precio-badge:hover {
      transform: scale(1.05);
    }

    .detalle {
      font-size: 1rem;
      line-height: 1.8;
    }

    .detalle span {
      display: block;
      margin: 8px 0;
      padding: 5px 0;
    }

    .disponible {
      color: var(--success-green);
      font-weight: bold;
      font-size: 1.1rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .marca, .modelo {
      color: var(--dark-text);
      font-weight: 500;
    }

    .availability-table {
      background: var(--white);
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      max-width: 700px;
      margin: 0 auto;
      animation: fadeInScale 1s ease-out 0.6s both;
    }

    @keyframes fadeInScale {
      from {
        opacity: 0;
        transform: scale(0.9);
      }
      to {
        opacity: 1;
        transform: scale(1);
      }
    }

    .table-header {
      background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
      color: var(--white);
      padding: 20px;
      text-align: center;
    }

    .table-header h3 {
      font-size: 1.5rem;
      margin-bottom: 5px;
    }

    .table-subtitle {
      font-size: 0.9rem;
      opacity: 0.9;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    th, td {
      padding: 18px;
      text-align: center;
      border-bottom: 1px solid #eee;
    }

    th {
      background: var(--primary-blue);
      color: var(--white);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      font-size: 0.9rem;
    }

    td {
      font-weight: 500;
      transition: background 0.2s ease;
    }

    tr:hover td {
      background: rgba(0, 45, 138, 0.05);
    }

    .disponible-table {
      color: var(--success-green);
      font-weight: bold;
    }

    .contact-section {
      background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
      padding: 60px 20px;
      text-align: center;
      color: var(--white);
    }

    .contact-title {
      font-size: 2rem;
      margin-bottom: 20px;
    }

    .contact-text {
      font-size: 1.1rem;
      opacity: 0.9;
      max-width: 600px;
      margin: 0 auto;
    }

    @media (max-width: 768px) {
      .main-title {
        font-size: 2.5rem;
      }
      
      .subtitle {
        font-size: 1.1rem;
      }
      
      .baterias-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      
      .container {
        padding: 40px 15px;
      }
      
      .section-title {
        font-size: 2rem;
      }
    }

    .pulse {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(0, 45, 138, 0.4);
      }
      70% {
        box-shadow: 0 0 0 10px rgba(0, 45, 138, 0);
      }
      100% {
        box-shadow: 0 0 0 0 rgba(0, 45, 138, 0);
      }
    }

    .btn-volver-container {
  text-align: center;
  margin: 40px 0;
}

.btn-volver {
  display: inline-block;
  background: linear-gradient(135deg, #007bff, #0056b3);
  color: #fff;
  padding: 12px 24px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0, 91, 187, 0.3);
  transition: all 0.3s ease;
}

.btn-volver:hover {
  background: linear-gradient(135deg, #0056b3, #003c82);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 91, 187, 0.5);
}