/* === Reset básico === */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', Arial, sans-serif;
      background: radial-gradient(circle at top, #111827 0%, #0d1117 100%);
      color: #f3f4f6;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      overflow-x: hidden;
      text-align: center;
      padding: 20px;
    }

    /* === Animación del fondo === */
    @keyframes fondo-mov {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    body {
      background: linear-gradient(135deg, #0d1117, #1e293b, #0d1117);
      background-size: 300% 300%;
      animation: fondo-mov 15s ease infinite;
    }

    /* === Logo circular con efecto neón === */
    .logo {
      width: 140px;
      height: 140px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, #00e1ff, #005b8f);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.8em;
      font-weight: bold;
      color: white;
      box-shadow: 0 0 25px rgba(0, 225, 255, 0.7), 0 0 55px rgba(0, 225, 255, 0.3);
      margin-bottom: 25px;
      transition: transform 0.5s ease;
    }

    .logo:hover {
      transform: rotate(10deg) scale(1.1);
    }

    /* === Títulos === */
    h1 {
      font-size: 2.5em;
      color: #00d1ff;
      margin-bottom: 0.3em;
      text-shadow: 0 0 12px rgba(0, 209, 255, 0.6);
    }

    h2 {
      font-weight: 400;
      color: #cbd5e1;
      margin-bottom: 1.8em;
      font-size: 1.2em;
      max-width: 600px;
      line-height: 1.4em;
    }

    /* === Botón con animación luminosa === */
    a {
      display: inline-block;
      margin-top: 15px;
      padding: 12px 30px;
      background: linear-gradient(90deg, #00d1ff, #007acc);
      color: #0d1117;
      border-radius: 30px;
      text-decoration: none;
      font-weight: 600;
      font-size: 1em;
      box-shadow: 0 0 15px rgba(0, 209, 255, 0.4);
      transition: all 0.3s ease;
    }

    a:hover {
      background: linear-gradient(90deg, #007acc, #00d1ff);
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(0, 209, 255, 0.6);
    }

    /* === Footer === */
    footer {
      position: fixed;
      bottom: 10px;
      text-align: center;
      width: 100%;
      font-size: 0.9em;
      color: #6b7280;
      opacity: 0.8;
    }

    /* === Adaptación responsiva === */
    @media (max-width: 768px) {
      .logo {
        width: 110px;
        height: 110px;
        font-size: 2em;
      }

      h1 {
        font-size: 1.9em;
      }

      h2 {
        font-size: 1em;
        margin-bottom: 1.5em;
      }

      a {
        padding: 10px 25px;
        font-size: 0.95em;
      }
    }

    @media (min-width: 1600px) {
      h1 { font-size: 3.5em; }
      h2 { font-size: 1.5em; }
      .logo { width: 180px; height: 180px; font-size: 3.5em; }
      a { padding: 15px 40px; font-size: 1.2em; }
    }