.sidebar {
    position: sticky;
    height: fit-content;
    top: 10%;
    text-decoration: none;
    padding: 10px;
animation: fadeIn 0.5s ease-in-out 0.2s forwards;
}

.sidebar-heading {
    font-size: 1.2em;
    color: #333;
    margin-top: 0;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 2px solid #007bff;
}

.sidebar-list-wrapper {
    border: 1px solid #ccc;
    border-radius: 5px;
    overflow: hidden;
}

.sidebar-category-link {
    display: block;
    padding: 10px 15px;
    text-decoration: none !important;
    color: inherit !important;
    transition: background-color 0.3s ease, color 0.3s ease, padding-left 0.3s ease; /* Added padding-left to transition */
    cursor: pointer;
    font-size: 1em;
    font-weight: bold;
    position: relative; /* Needed for absolute positioning of the underline */
}

.sidebar-category-link:hover {
    background-color: #f0f8ff;
    color: #007bff;
    padding-left: 20px; /* Add a slight indent on hover */
}

.sidebar-category-link::after {
    content: '';
    position: absolute;
    left: 15px;
    right: 15px;
    bottom: 3px;
    height: 1px;
    background-color: #007bff;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.sidebar-category-link:hover::after {
    opacity: 1;
}

.sidebar-subsections {

    list-style-type: none;
    padding: 0;
    margin: 0;
    display: none; /* Initially hidden */
    background-color: #f9f9f9;
}

.sidebar-subsections.open {
    display: block;
}


.sidebar-subsections li a {
    display: block;
    padding: 8px 25px;
    text-decoration: none !important;
    color: #777 !important;
    transition: color 0.3s ease, padding-left 0.3s ease; /* Added padding-left to transition */
    font-size: 0.85em;
    position: relative;
}

.sidebar-subsections li a:hover {
    color: #007bff !important;
    padding-left: 30px; /* Add a slight indent on hover */
}

.sidebar-subsections li a::after {
    content: '';
    position: absolute;
    left: 25px;
    right: 25px;
    bottom: 2px;
    height: 1px;
    background-color: #ccc;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.sidebar-subsections li a:hover::after {
    opacity: 1;
}

/* Fade In Animation (applied on initial load or when content appears) */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.5s ease-in-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Fade Out Animation (applied before content disappears) */
.fade-out {
    opacity: 1;
    animation: fadeOut 0.3s ease-in-out forwards;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.sidebar {
    position: sticky;
    height: fit-content;
    top: 10%;
    text-decoration: none;
    padding: 10px;
    opacity: 0; /* Initially hidden for fade-in */
    animation: fadeIn 0.5s ease-in-out 0.2s forwards; /* Add a slight delay */
}

@media (max-width: 959px) {
    .sidebar {
        position: static;
        top: auto;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #eee;
        padding: 15px;
        margin-bottom: 20px;
        border-radius: 0;
        box-shadow: none;
        opacity: 0; /* Initially hidden for fade-in */
        animation: fadeIn 0.5s ease-in-out 0.2s forwards; /* Add a slight delay */
    }
}

.sidebar-heading {
    font-size: 1.2em;
    color: #333;
    margin-top: 0;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 2px solid #007bff;
    opacity: 0; /* Initially hidden for fade-in */
    animation: fadeIn 0.5s ease-in-out 0.3s forwards; /* Add a slight delay */
}

.sidebar-list-wrapper {
    border: 1px solid #ccc;
    border-radius: 5px;
    overflow: hidden;
    opacity: 0; /* Initially hidden for fade-in */
    animation: fadeIn 0.5s ease-in-out 0.4s forwards; /* Add a slight delay */
}

.sidebar-category-link {
    display: block;
    padding: 10px 15px;
    text-decoration: none !important;
    color: inherit !important;
    transition: background-color 0.3s ease, color 0.3s ease, padding-left 0.3s ease, opacity 0.3s ease-in-out; /* Added opacity transition */
    cursor: pointer;
    font-size: 1em;
    font-weight: bold;
    position: relative;
    opacity: 0; /* Initially hidden for fade-in */
    animation: fadeIn 0.5s ease-in-out 0.5s forwards; /* Add a slight delay */
}

.sidebar-category-link:hover {
    background-color: #f0f8ff;
    color: #007bff;
    padding-left: 20px;
    opacity: 1; /* Fade in on hover */
}

.sidebar-category-link::after {
    content: '';
    position: absolute;
    left: 15px;
    right: 15px;
    bottom: 3px;
    height: 1px;
    background-color: #007bff;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.sidebar-category-link:hover::after {
    opacity: 1;
}

.sidebar-subsections {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: none; /* Controlled by JavaScript */
    background-color: #f9f9f9;
    opacity: 0; /* Initially hidden for fade-in */
    transition: opacity 0.3s ease-in-out; /* For JavaScript toggling */
}

.sidebar-subsections.open {
    opacity: 1; /* Fade in when opened by JavaScript */
}

.sidebar-subsections li a {
    display: block;
    padding: 8px 25px;
    text-decoration: none !important;
    color: #777 !important;
    transition: color 0.3s ease, padding-left 0.3s ease, opacity 0.3s ease-in-out; /* Added opacity transition */
    font-size: 0.85em;
    position: relative;
    opacity: 0; /* Initially hidden for fade-in */
    animation: fadeIn 0.5s ease-in-out 0.6s forwards; /* Add a slight delay */
}

.sidebar-subsections li a:hover {
    color: #007bff !important;
    padding-left: 30px;
    opacity: 1; /* Fade in on hover */
}

.sidebar-subsections li a::after {
    content: '';
    position: absolute;
    left: 25px;
    right: 25px;
    bottom: 2px;
    height: 1px;
    background-color: #ccc;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.sidebar-subsections li a:hover::after {
    opacity: 1;
}