.theme-toggle {
    margin: 10px 0 20px;
    display: flex;
    justify-content: center;
    gap: 12px;
}
.theme-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid #ccc;
    cursor: pointer;
    transition: transform 0.3s;
}
.theme-btn:hover {
    transform: scale(1.2);
}

.theme-btn.blue {
    background: #007bff;
}

.theme-btn.green {
    background: #28a745;
}

.theme-btn.red {
    background: #dc3545;
}

.theme-btn.gold {
    background: #ffc107;
}

.theme-btn.purple {
    background: #6f42c1;
}

:root {
    --primary: #007bff;
    --hover: #0056b3;
}

:root[data-theme='blue'] {
    --primary: #007bff;
    --hover: #0056b3;
}

:root[data-theme='green'] {
    --primary: #28a745;
    --hover: #1c7c34;
}

:root[data-theme='red'] {
    --primary: #dc3545;
    --hover: #a71d2a;
}

:root[data-theme='gold'] {
    --primary: #ffc107;
    --hover: #cc9c00;
}

:root[data-theme='purple'] {
    --primary: #6f42c1;
    --hover: #532c9c;
}

.toggle-lang,
.upload-btn,
.file-download {
    background: var(--primary);
}
.toggle-lang:hover,
.upload-btn:hover,
.file-download:hover {
    background: var(--hover);
}

div.small {
    font-size: small;
    margin: 16px 0 20px 0;
}