.left-sidebar {
    background: #ffffff;
    box-shadow: 2px 0 5px rgba(0,0,0,.05);
    height: calc(100vh - 70px);
    position: sticky;
    top: 70px;
    padding: 0;
    transition: all 0.3s ease;
}

.sidebar-content {
    padding: 1.5rem 1rem;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f8f9fa;
}

.sidebar-header h5 {
    color: #2c3e50;
    font-weight: 600;
    margin: 0;
    font-size: 1.1rem;
}

.sidebar-menu {
    flex-grow: 1;
}

.sidebar-menu .nav-item {
    margin-bottom: 0.5rem;
    width: 100%;
}

.sidebar-menu .nav-link {
    color: #505d69 !important;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    font-weight: 500;
}

.sidebar-menu .nav-link i {
    margin-right: 0.8rem;
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
    color: #6c757d;
    transition: all 0.3s ease;
}

.sidebar-menu .nav-link:hover {
    background-color: #f8f9fa;
    color: #3498db !important;
}

.sidebar-menu .nav-link:hover i {
    color: #3498db;
}

.sidebar-menu .nav-link.active {
    background-color: #e9f2ff;
    color: #3498db !important;
}

.sidebar-menu .nav-link.active i {
    color: #3498db;
}

.sidebar-footer {
    padding-top: 1rem;
    margin-top: auto;
    border-top: 1px solid #f8f9fa;
}

.sidebar-footer p {
    margin: 0;
    color: #6c757d;
    font-size: 0.85rem;
}

/* Submenu Styles */
.sidebar-menu .nav-link[data-bs-toggle="collapse"] {
    cursor: pointer;
}

.sidebar-menu .nav-link[data-bs-toggle="collapse"] .bi-chevron-down {
    transition: transform 0.3s ease;
    margin-left: auto;
    font-size: 0.9rem;
}

.sidebar-menu .nav-link[data-bs-toggle="collapse"][aria-expanded="true"] .bi-chevron-down {
    transform: rotate(180deg);
}

.sidebar-menu .collapse {
    margin-top: 0.25rem;
}

.sidebar-menu .collapse .nav {
    padding-left: 0.5rem;
}

.sidebar-menu .collapse .nav-link {
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    font-size: 0.95rem;
    border-left: 2px solid #e9ecef;
}

.sidebar-menu .collapse .nav-link:hover {
    border-left-color: #3498db;
}

.sidebar-menu .collapse .nav-link.active {
    border-left-color: #3498db;
    background-color: #e9f2ff;
}

/* Responsive Design */
@media (max-width: 768px) {
    .left-sidebar {
        height: auto;
        position: relative;
        top: 0;
        margin-bottom: 2rem;
    }

    .sidebar-content {
        padding: 1rem;
    }

    .sidebar-header {
        margin-bottom: 1rem;
        padding-bottom: 0.5rem;
    }

    .sidebar-menu .nav-link {
        padding: 0.6rem 1rem;
    }
}

/* Collapsed Sidebar for tablets */
@media (min-width: 769px) and (max-width: 991px) {
    .left-sidebar {
        width: 70px;
    }

    .sidebar-content {
        padding: 1rem 0.5rem;
    }

    .sidebar-header {
        display: none;
    }

    .sidebar-menu .nav-link span {
        display: none;
    }

    .sidebar-menu .nav-link i {
        margin: 0;
        font-size: 1.3rem;
    }

    .sidebar-footer {
        display: none;
    }
}