.theme-toggle-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
    padding: 8px;
    margin-left: 10px;
}

.theme-toggle-btn:hover {
    background-color: var(--hover-background);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--primary-color);
}

/* Adjust header layout */
.header-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .theme-toggle-btn {
        margin-left: 5px;
    }
}