:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --sidebar-width: 260px;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: width 0.3s ease, transform 0.3s ease;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: 24px 0;
    font-size: 0;
}

.sidebar.collapsed .sidebar-header i {
    font-size: 1.5rem;
}

.sidebar.collapsed .nav-item span {
    display: none;
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 15px 0;
    font-size: 0;
}

.sidebar.collapsed .nav-item i {
    font-size: 1.3rem;
}

.sidebar-header {
    padding: 24px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.nav-item i {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: 80px;
}

.topbar {
    height: 70px;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

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

.dashboard-container {
    padding: 30px;
    flex: 1;
}

.page-header {
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Cards (Glassmorphism inspired) */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 2rem;
    color: var(--primary);
}

.stat-title {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Tables */
.card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Badges & Buttons */
.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge.active { background-color: rgba(16, 185, 129, 0.2); color: var(--success); }
.badge.inactive { background-color: rgba(239, 68, 68, 0.2); color: var(--danger); }

.btn {
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 800px;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--input-bg, rgba(0, 0, 0, 0.2));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

select.form-control option {
    background-color: var(--bg-panel);
    color: var(--text-main);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); width: 260px; }
    .sidebar.open { transform: translateX(0); }
    .sidebar.collapsed { width: 260px; } /* Reset collapsed on mobile */
    .sidebar.collapsed .sidebar-header { font-size: 1.25rem; justify-content: flex-start; padding: 24px; }
    .sidebar.collapsed .sidebar-header i { font-size: inherit; }
    .sidebar.collapsed .nav-item span { display: inline; }
    .sidebar.collapsed .nav-item { justify-content: flex-start; padding: 12px 24px; }
    .sidebar.collapsed .nav-item i { font-size: 1.1rem; }
    
    .main-content { margin-left: 0; }
    .main-content.expanded { margin-left: 0; }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .dashboard-container {
        padding: 15px;
    }
    
    table {
        min-width: 600px;
    }
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}
.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
}
.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* Dynamic Form Layout */
.form-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
}
.full-width {
    grid-column: 1 / -1;
}

/* Page Sections */
.page-section {
    display: none;
}
.page-section.active {
    display: block;
}

/* Switch Toggle Switches */
.switch { position: relative; display: inline-block; width: 48px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--border-color, #4b5563); transition: 0.3s; border-radius: 26px; }
.switch .slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background-color: white; transition: 0.3s; border-radius: 50%; box-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.switch input:checked + .slider { background-color: var(--primary, #3b82f6) !important; }
.switch input:checked + .slider:before { transform: translateX(22px); }

#notification-container { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 9999; display: flex; flex-direction: column; align-items: center; gap: 10px; pointer-events: none; } 
.custom-notification { padding: 16px 32px; border-radius: 50px; box-shadow: 0 10px 25px rgba(0,0,0,0.2); font-size: 16px; font-weight: 500; display: flex; align-items: center; gap: 12px; opacity: 0; transform: scale(0.9); transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55); pointer-events: auto; } .custom-notification.success { background: #10b981; color: #ffffff; } .custom-notification.error { background: #ef4444; color: #ffffff; } .custom-notification.show { opacity: 1; transform: scale(1); }