body {
    font-family: 'Poppins', sans-serif;
    background-color: #f8f9fa; /* Light background for the body */
}
#wrapper {
    display: flex;
    min-height: 100vh;
    overflow-x: hidden; /* Prevent horizontal scroll */
}
#sidebar-wrapper {
    width: 16rem; /* Slightly wider sidebar */
    flex-shrink: 0;
    background-color: #212529; /* Dark background for sidebar */
    color: #f8f9fa; /* Light text for sidebar */
    transition: margin .25s ease-out;
}
#sidebar-wrapper .sidebar-heading {
    padding: 1.5rem 1.25rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: #ffffff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
#sidebar-wrapper .list-group-item {
    background-color: transparent;
    color: #adb5bd; /* Lighter grey for links */
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    display: flex;
    align-items: center;
}
#sidebar-wrapper .list-group-item:hover,
#sidebar-wrapper .list-group-item.active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 0.25rem; /* Subtle rounded corners on hover */
}
#sidebar-wrapper .list-group-item i {
    margin-right: 0.75rem;
    font-size: 1.1rem;
}
#page-content-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* Allow content to shrink */
}
.navbar {
    border-bottom: 1px solid #e9ecef; /* Subtle border for navbar */
    background-color: #ffffff;
}
.card {
    border: none;
    border-radius: 0.75rem; /* More rounded cards */
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075); /* Subtle shadow */
}
.card-header {
    background-color: #ffffff;
    border-bottom: 1px solid #e9ecef;
    font-weight: 500;
}
/* Responsive adjustments for sidebar toggle */
@media (max-width: 768px) {
    #sidebar-wrapper {
        margin-left: -16rem; /* Hide sidebar by default on small screens */
        position: fixed; /* Make it fixed to slide out */
        z-index: 1030; /* Above content */
        height: 100vh; /* Full height */
    }
    #wrapper.toggled #sidebar-wrapper {
        margin-left: 0; /* Show sidebar when toggled */
    }
    #page-content-wrapper {
        width: 100%; /* Full width for content */
    }
    #wrapper.toggled #page-content-wrapper {
        margin-left: 16rem; /* Push content when sidebar is open */
    }
}

/* Styles for sidebar submenu */
#sidebar-wrapper .list-group-item[data-bs-toggle="collapse"] .bi-chevron-down {
    transition: transform 0.2s ease-in-out;
}
#sidebar-wrapper .list-group-item[data-bs-toggle="collapse"][aria-expanded="true"] .bi-chevron-down {
    transform: rotate(180deg);
}
#sidebar-wrapper .collapse .list-group-item {
    padding-left: 2.5rem; /* Indent sub-items */
    background-color: #1a1d20; /* Slightly different background for sub-menu */
}
#sidebar-wrapper .collapse .list-group-item:hover,
#sidebar-wrapper .collapse .list-group-item.active {
    background-color: rgba(255, 255, 255, 0.1);
}