body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    overflow: hidden;
}

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

.container {
    background: rgba(255, 255, 255, 0.9);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 0 15px rgba(0,0,0,0.5);
    max-width: 400px;
    width: 90%;
}

input[type="file"] {
    margin-bottom: 15px;
}

button {
    background-color: #007BFF;
    color: white;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.shake {
    animation: shake 0.5s infinite;
}

@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    25% { transform: translate(-1px, -2px) rotate(-1deg); }
    50% { transform: translate(-3px, 0px) rotate(1deg); }
    75% { transform: translate(3px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -1px) rotate(1deg); }
}