:root {
    --sidebar-width: 250px;
    --topbar-height: 60px;
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --hover-color: #2980b9;
    --text-light: #ecf0f1;
    --border-color: #dee2e6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #02af84; /* #f8f9fa; */
    overflow-x: hidden;
}

/* Top Navigation Bar */
.topbar {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    height: var(--topbar-height);
    background-color: #02af84;
    border-bottom: 1px solid var(--border-color);
    z-index: 1030;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}

.topbar-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.topbar-brand:hover {
    color: var(--accent-color);
}

.topbar-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.5rem;
    margin-right: 1rem;
    display: none;
}

.topbar-nav {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

.topbar-user:hover {
    background-color: #f8f9fa;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--primary-color);
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform 0.3s ease;
    z-index: 1020;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-section-title {
    padding: 1rem 1.5rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #95a5a6;
    letter-spacing: 0.5px;
}

.nav-item {
    margin: 0.25rem 0.75rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--text-light);
    text-decoration: none;
    border-radius: 0.375rem;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.nav-link:hover {
    background-color: var(--secondary-color);
    color: #fff;
    transform: translateX(2px);
}

.nav-link.active {
    background-color: var(--accent-color);
    color: #fff;
}

.nav-link i {
    width: 24px;
    margin-right: 0.75rem;
    font-size: 1.1rem;
}

.nav-link .badge {
    margin-left: auto;
}

/* Submenu */
.nav-submenu {
    display: none;
    padding-left: 1rem;
}

.nav-submenu.show {
    display: block;
}

.nav-submenu .nav-link {
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    font-size: 0.9rem;
}

.nav-link.has-submenu::after {
    content: '\F285';
    font-family: 'bootstrap-icons';
    margin-left: auto;
    transition: transform 0.2s;
}

.nav-link.has-submenu.open::after {
    transform: rotate(90deg);
}

/* Main Content Area */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--topbar-height);
    padding: 2rem;
    min-height: calc(100vh - var(--topbar-height));
    transition: margin-left 0.3s ease;
    background-color: #f8f9fa;
}

.main-content.expanded {
    margin-left: 0;
}

.content-header {
    margin-bottom: 2rem;
}

.content-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.breadcrumb {
    background-color: transparent;
    padding: 0;
    margin: 0;
    font-size: 0.9rem;
}

/* Cards */
.card {
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
    border-radius: 0.5rem;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    padding: 1rem 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .topbar-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        top: var(--topbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0,0,0,0.5);
        z-index: 1010;
    }

    .sidebar-overlay.show {
        display: block;
    }
}

/* Scrollbar styling for sidebar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--secondary-color);
}

.sidebar::-webkit-scrollbar-thumb {
    background: #7f8c8d;
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: #95a5a6;
}