/* ====== ESTILO GENERAL ====== */
body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: radial-gradient(circle at top, #0b1a2b, #000);
    color: #00e5ff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

/* ====== CONTENEDOR ====== */
.contenedor {
    background: rgba(10, 20, 40, 0.85);
    border: 2px solid #00e5ff;
    border-radius: 15px;
    padding: 30px;
    width: 80%;
    max-width: 700px;
    box-shadow: 0 0 20px #00e5ff;
    text-align: center;
}

/* ====== TITULOS ====== */
h1, h2, h3, h4, h5, h6 {
    margin: 8px 0;
    text-shadow: 0 0 8px #00e5ff;
}

p {
    margin-top: 15px;
    font-size: 16px;
    color: #bffaff;
}

/* ====== BOTÓN ====== */
.btn-regresar {
    display: inline-block;
    margin-top: 25px;
    padding: 12px 20px;
    background: linear-gradient(90deg, #00e5ff, #0066ff);
    color: #000;
    text-decoration: none;
    font-weight: bold;
    border-radius: 10px;
    box-shadow: 0 0 15px #00e5ff;
    transition: 0.3s;
}

.btn-regresar:hover {
    transform: scale(1.05);
    box-shadow: 0 0 25px #00e5ff;
}