body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    text-align: center;
    padding: 50px;
    display: flex;
    flex-direction: column;
}
input, button { 
    font-size: 16px;
    padding: 10px;
    margin: 5px;
}

video {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    z-index: -1;
}

.loading {
    font-size: 20px;
    font-weight: bold;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50%, 100% { opacity: 1; }
    25%, 75% { opacity: 0.5; }
}