body {
    margin: 0;
    height: 100vh;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;

    background: linear-gradient(-45deg, #001f3f, #0074D9, #111, #00c3ff);
    background-size: 400% 400%;
    animation: fondo 10s ease infinite;
}

@keyframes fondo {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.container {
    width: 350px;
    padding: 30px;
    border-radius: 20px;
    text-align: center;

    background: rgba(0,0,0,0.65);
    backdrop-filter: blur(10px);

    color: white;
    box-shadow: 0 0 30px #00c3ff;
}

input {
    width: 90%;
    padding: 12px;
    margin: 10px;
    border-radius: 10px;
    border: none;
}

button {
    padding: 12px 30px;
    border: none;
    border-radius: 15px;
    cursor: pointer;

    background: #00c3ff;
    color: white;
    font-size: 16px;
}