body, html {
    height: 100%;
    margin: 0;
}

.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    text-align: center;
}

body {
    font-family: Arial, sans-serif;
    background-color: #1a1a1a;
    color: #a0cfff;
}

.upload-area {
    display: inline-block;
    border: 2px dashed #555;
    padding: 4em;
    margin-top: 1em;
    cursor: pointer;
    border-radius: 10px;
    transition: background-color 0.3s, border-color 0.3s;
}

.upload-area.hover {
    border-color: #4a90e2;
    background-color: rgba(74, 144, 226, 0.1);
}

input[type="file"] {
    display: none;
}

button {
    margin-top: 1em;
    padding: 0.5em 1em;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

progress {
    width: 50%;
    height: 20px;
}

footer {
    margin-top: 3em;
    font-size: 0.8em;
    color: #666;
}

.size-limit {
    margin-top: 1em;
    font-size: 0.9em;
    color: #ffcc00;
}