.pantalla-completa {
    height: 100vh;
    background: linear-gradient(135deg, #1e3a8a, #010e1c);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: white;
    position: relative;
    overflow: hidden;
  }
  .pantalla-completa::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.05), transparent 40%),
                radial-gradient(circle at 80% 80%, rgba(255,255,255,0.04), transparent 40%);
    animation: fondoAnimado 20s linear infinite;
    z-index: 0;
  }
  
  @keyframes fondoAnimado {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-20%, -20%); }
  }
  
  .contenido {
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    animation: fadeIn 1.2s ease-in-out;
    text-align: center;
  }
  
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  .titulo {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 2px 2px 10px rgba(0,0,0,0.4);
  }
  
  .subtitulo {
    font-size: 1.2rem;
    font-weight: 400;
    opacity: 0.85;
    margin-bottom: 35px;
  }
  
  .btn-iniciar {
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 40px;
    background: #ffffff;
    color: #1e3a8a;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 18px rgba(0,0,0,0.25);
  }
  
  .btn-iniciar:hover {
    background-color: #e0e7ff;
    transform: scale(1.07);
  }
  footer {
    background-color: black;
    padding: 10px 0;
    text-align: center;
    font-family: sans-serif;
    color: white;
}

.footer-contenido {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.footer-github {
    color: rgb(15, 15, 148);
    text-decoration: none;
    font-weight: bold;
}

.footer-github:hover {
    text-decoration: underline;
}