:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #10b981;
    --secondary-dark: #059669;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --warning: #f59e0b;
    --warning-light: #fbbf24;
    --dark: #1f2937;
    --dark-light: #374151;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --sidebar-width: 260px;
    --transition: all 0.3s ease;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--dark) 0%, var(--gray-900) 100%);
    color: var(--white);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.sidebar-brand {
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand .brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-brand .brand-logo i {
    font-size: 1.75rem;
    color: var(--primary-light);
}

.sidebar-brand .brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.sidebar-brand .brand-tagline {
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

.sidebar-user {
    padding: 1.25rem 1.5rem;
    background: rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-user .user-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    color: white;
}

.sidebar-user .user-info {
    margin-left: 0.75rem;
}

.sidebar-user .user-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.sidebar-user .user-role {
    font-size: 0.75rem;
    color: var(--gray-400);
    text-transform: capitalize;
}

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

.sidebar-menu .menu-section {
    padding: 0.5rem 1rem;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-top: 0.5rem;
}

.sidebar-menu .menu-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    gap: 0.75rem;
    font-size: 0.875rem;
}

.sidebar-menu .menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
}

.sidebar-menu .menu-item.active {
    background: rgba(37, 99, 235, 0.15);
    color: var(--primary-light);
    border-left-color: var(--primary-light);
}

.sidebar-menu .menu-item i {
    width: 1.25rem;
    text-align: center;
    font-size: 1rem;
}

.sidebar-menu .menu-badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 0.6875rem;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-weight: 600;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* Top Navigation */
.top-navbar {
    background: var(--white);
    padding: 1rem 2rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-navbar .page-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.top-navbar .nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.top-navbar .nav-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--gray-600);
    transition: var(--transition);
    font-size: 0.875rem;
}

.top-navbar .nav-item:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

/* Content Area */
.content-area {
    padding: 2rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header .card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-card .stat-icon.primary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
}

.stat-card .stat-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary);
}

.stat-card .stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.stat-card .stat-icon.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.stat-card .stat-content {
    flex: 1;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.stat-card .stat-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background: var(--gray-700);
    color: white;
}

.btn-secondary:hover {
    background: var(--gray-800);
}

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

.btn-success:hover {
    background: var(--secondary-dark);
}

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

.btn-danger:hover {
    background: var(--danger-dark);
}

.btn-warning {
    background: var(--warning);
    color: var(--gray-900);
}

.btn-warning:hover {
    background: var(--warning-light);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.btn i {
    font-size: 0.875rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-800);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

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

.table th,
.table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: var(--gray-50);
}

.table td {
    font-size: 0.875rem;
    color: var(--gray-700);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-success,
.badge-approved {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary);
}

.badge-warning,
.badge-pending {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge-danger,
.badge-declined {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.badge-primary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
}

.badge-secondary {
    background: var(--gray-200);
    color: var(--gray-600);
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--secondary-dark);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--danger-dark);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: #b45309;
}

.alert-info {
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    color: var(--primary-dark);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Tabs */
.tabs {
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
}

.tab {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    border: none;
    background: transparent;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
    margin-bottom: -1px;
}

.tab:hover {
    color: var(--gray-700);
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Pagination */
.pagination {
    display: flex;
    gap: 0.25rem;
}

.page-item {
    list-style: none;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    height: 2.25rem;
    padding: 0 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    text-decoration: none;
    transition: var(--transition);
}

.page-link:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.page-item.active .page-link {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--gray-500); }
.text-primary { color: var(--primary); }
.text-success { color: var(--secondary); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

/* Responsive */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 0px;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .sidebar.active {
        transform: translateX(0);
        width: var(--sidebar-width);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-btn {
        display: flex !important;
    }
}

.mobile-menu-btn {
    display: none;
    width: 2.5rem;
    height: 2.5rem;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--gray-700);
    cursor: pointer;
    border-radius: var(--radius);
}

.mobile-menu-btn:hover {
    background: var(--gray-100);
}