body {
    overflow-x: hidden;
}

#container {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    width: 90vw;
    max-width: calc(100vw - 20px);
    margin: 10px auto;
    gap: 20px;
}

button {
    font: inherit;
}

#controls {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 30%;
    margin-left: 0;
    border-radius: 8px;
    padding: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

#preview {
    flex: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 70%;
    border-radius: 8px;
    padding: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

#output-video {
    margin-top: 20px;
    max-width: 100%;
}

#upload {
    margin-bottom: 20px;
}

#process-btn,
#download-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    font: inherit;
}

#process-btn:hover,
#download-btn:hover {
    background-color: #0056b3;
}

#message {
    margin-top: 10px;
    font-size: 16px;
    color: green;
}

.spinner {
    margin-top: 10px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: #007bff;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.progress {
    display: none;
    flex-direction: column;
    align-items: center;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #f3f3f3;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-bar-fill {
    height: 100%;
    background-color: #007bff;
    width: 0;
    border-radius: 10px;
    transition: width 0.5s;
}

@media (max-width: 768px) {
    #container {
        flex-direction: column;
        align-items: center;
    }

    #controls {
        width: 95%;
        max-width: 100%;
    }

    #preview {
        width: 95%;
        max-width: 100%;
    }
}

body.dark-mode #controls,
body.dark-mode #preview {
    background-color: #333;
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}