:root {
    --primary-color: #007bff; /* Bootstrap primary blue */
    --secondary-color: #6c757d; /* Bootstrap secondary grey */
    --light-bg: #f8f9fa; /* Light background */
    --dark-text: #343a40; /* Dark text */
    --border-color: #dee2e6; /* Light border */
    --sidebar-width: 250px;
}

body {
    overflow-x: hidden;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; /* Modern font */
    color: var(--dark-text);
    background-color: var(--light-bg);
}

/* Wrapper for sidebar and content */
#wrapper {
    display: flex;
}

/* Sidebar Styling */
#sidebar-wrapper {
    min-height: 100vh;
    margin-left: -var(--sidebar-width);
    transition: margin .25s ease-out;
    width: var(--sidebar-width);
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075); /* Subtle shadow */
    background-color: #ffffff; /* White sidebar */
}

#sidebar-wrapper .sidebar-heading {
    padding: 1.5rem 1.25rem;
    font-size: 1.8rem; /* Slightly larger heading */
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
}

#sidebar-wrapper .list-group {
    width: 100%;
}

#sidebar-wrapper .list-group-item {
    padding: 1rem 1.25rem;
    color: var(--dark-text);
    font-size: 1.05rem; /* Slightly larger text */
    border: none; /* Remove default borders */
    transition: background-color 0.2s ease, color 0.2s ease;
}

#sidebar-wrapper .list-group-item:hover {
    background-color: #e9ecef; /* Lighter hover */
    color: var(--primary-color);
}

#sidebar-wrapper .list-group-item.active {
    background-color: var(--primary-color);
    color: red;
    border-radius: 0;
}

#sidebar-wrapper .list-group-item i {
    font-size: 1.3rem; /* Larger icons */
    margin-right: 0.8rem;
    width: 25px; /* Ensure consistent spacing */
    text-align: center;
}


/* Page Content Wrapper */
#page-content-wrapper {
    min-width: 100vw;
    background-color: var(--light-bg);
}

/* Toggled State */
#wrapper.toggled #sidebar-wrapper {
    margin-left: 0;
}

/* Navbar */
.navbar {
    padding: 1rem 1.5rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    background-color: #ffffff !important; /* White navbar */
    border-bottom: 1px solid var(--border-color);
}

.navbar .btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-size: 1.1rem; /* Larger button icon */
    padding: 0.6rem 0.9rem;
}

.navbar .btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.navbar .nav-link {
    font-size: 1.1rem; /* Larger nav links */
    color: var(--dark-text) !important;
}

.navbar .nav-link i {
    font-size: 1.3rem; /* Larger user icon */
}

/* Main Content Area */
.container-fluid.px-4 {
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
}

h1 {
    font-size: 2.5rem; /* Larger main headings */
    font-weight: 600;
    color: var(--dark-text);
}

/* Card Styling */
.card {
    border: none;
    border-radius: 0.75rem; /* More rounded corners for modern feel */
    box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.08); /* More prominent shadow */
    background-color: #ffffff;
}

.card-header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--dark-text);
}

.card-body {
    padding: 1.5rem;
}

/* Specific card content styling */
.card-body .text-uppercase {
    font-size: 0.95rem; /* Adjusted for inner card text */
    letter-spacing: 0.05rem;
    font-weight: 700;
}

.card-body .h3 {
    font-size: 2.2rem; /* Larger numbers */
    font-weight: 700;
}

.card-body i.fa-3x {
    font-size: 3.5rem; /* Even larger icons within cards */
    opacity: 0.6;
}

/* Responsive adjustments */
@media (min-width: 768px) {
    #sidebar-wrapper {
        margin-left: 0;
    }
    #page-content-wrapper {
        min-width: 0;
        width: 100%;
    }
    #wrapper.toggled #sidebar-wrapper {
        margin-left: -var(--sidebar-width);
    }
}