/**
 * Admin Dashboard Template - Main Stylesheet
 * Version: 1.0.0
 * License: MIT
 * 
 * Table of Contents:
 * 1. CSS Variables & Theme Colors
 * 2. Base Styles
 * 3. Layout Components
 * 4. Sidebar Navigation
 * 5. Top Navbar
 * 6. Dashboard Cards
 * 7. Charts & Data Visualization
 * 8. Tables
 * 9. Forms
 * 10. Buttons & Interactive Elements
 * 11. Utilities
 * 12. Dark Mode
 * 13. Responsive Styles
 */

/* ==========================================================================
   1. CSS Variables & Theme Colors
   ========================================================================== */

:root {
    /* Primary Colors */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --primary-dark: #3730a3;
    
    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --info-color: #3b82f6;
    --info-light: #dbeafe;
    
    /* Background Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Spacing */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --navbar-height: 64px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

/* ==========================================================================
   2. Base Styles
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   3. Layout Components
   ========================================================================== */

.wrapper {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--transition-normal);
}

.content-wrapper {
    padding: 1.5rem;
    padding-top: calc(var(--navbar-height) + 1.5rem);
}

.page-header {
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ==========================================================================
   4. Sidebar Navigation
   ========================================================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    transition: width var(--transition-normal), transform var(--transition-normal);
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    height: var(--navbar-height);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.sidebar-logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.125rem;
}

.sidebar-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.nav-section {
    margin-bottom: 1rem;
}

.nav-section-title {
    padding: 0.5rem 1.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.nav-item {
    padding: 0 0.75rem;
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.nav-link-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nav-link-text {
    white-space: nowrap;
    overflow: hidden;
}

.nav-badge {
    margin-left: auto;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    background-color: var(--primary-color);
    color: white;
}

/* Sidebar Collapsed State */
.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .sidebar-logo-text,
.sidebar.collapsed .nav-section-title,
.sidebar.collapsed .nav-link-text,
.sidebar.collapsed .nav-badge {
    opacity: 0;
    visibility: hidden;
}

.sidebar.collapsed + .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

/* ==========================================================================
   5. Top Navbar
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    right: 0;
    left: var(--sidebar-width);
    height: var(--navbar-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    transition: left var(--transition-normal);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
}

.sidebar.collapsed ~ .main-content .navbar {
    left: var(--sidebar-collapsed-width);
}

.navbar-search {
    position: relative;
    max-width: 320px;
    flex: 1;
}

.navbar-search-input {
    width: 100%;
    padding: 0.625rem 1rem 0.625rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--bg-tertiary);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.navbar-search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.navbar-search-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
}

.navbar-action-btn {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.navbar-action-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.navbar-action-btn .badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    font-weight: 600;
    background-color: var(--danger-color);
    color: white;
    border-radius: 50%;
}

.navbar-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.5rem;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.navbar-user:hover {
    background-color: var(--bg-tertiary);
}

.navbar-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.navbar-user-info {
    display: none;
}

@media (min-width: 768px) {
    .navbar-user-info {
        display: block;
    }
}

.navbar-user-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.navbar-user-role {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* User Dropdown Menu */
.user-dropdown {
    position: relative;
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 200px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.user-dropdown.active .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.user-dropdown-item:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.user-dropdown-item.danger {
    color: var(--danger-color);
}

.user-dropdown-item.danger:hover {
    background-color: var(--danger-light);
}

.user-dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.5rem 0;
}

/* ==========================================================================
   6. Dashboard Cards
   ========================================================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 576px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

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

.stat-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}

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

.stat-card-icon.primary {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.stat-card-icon.success {
    background-color: var(--success-light);
    color: var(--success-color);
}

.stat-card-icon.warning {
    background-color: var(--warning-light);
    color: var(--warning-color);
}

.stat-card-icon.info {
    background-color: var(--info-light);
    color: var(--info-color);
}

.stat-card-trend {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.stat-card-trend.up {
    background-color: var(--success-light);
    color: var(--success-color);
}

.stat-card-trend.down {
    background-color: var(--danger-light);
    color: var(--danger-color);
}

.stat-card-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.stat-card-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Card Component */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

/* ==========================================================================
   7. Charts & Data Visualization
   ========================================================================== */

.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.chart-legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.chart-legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

/* ==========================================================================
   8. Tables
   ========================================================================== */

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

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

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

.data-table th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
}

.data-table tbody tr {
    transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
    background-color: var(--bg-tertiary);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Table Cell Components */
.table-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.table-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.table-user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.table-user-email {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.table-status {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
}

.table-status.active {
    background-color: var(--success-light);
    color: var(--success-color);
}

.table-status.pending {
    background-color: var(--warning-light);
    color: var(--warning-color);
}

.table-status.inactive {
    background-color: var(--danger-light);
    color: var(--danger-color);
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

.table-action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.table-action-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.table-action-btn.danger:hover {
    background-color: var(--danger-light);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

/* ==========================================================================
   9. Forms
   ========================================================================== */

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-label.required::after {
    content: '*';
    color: var(--danger-color);
    margin-left: 0.25rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:disabled {
    background-color: var(--bg-tertiary);
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--danger-light);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-text {
    display: block;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.form-text.error {
    color: var(--danger-color);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.form-check-input {
    width: 18px;
    height: 18px;
    margin-top: 0.125rem;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.form-check-label {
    cursor: pointer;
    color: var(--text-primary);
}

/* Switch Toggle */
.form-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.form-switch-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.form-switch-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: var(--border-color);
    border-radius: 9999px;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.form-switch-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.form-switch-input:checked + .form-switch-slider {
    background-color: var(--primary-color);
}

.form-switch-input:checked + .form-switch-slider::before {
    transform: translateX(20px);
}

.form-switch-label {
    cursor: pointer;
    color: var(--text-primary);
}

/* Input Group */
.input-group {
    display: flex;
}

.input-group .form-control {
    flex: 1;
    border-radius: 0;
}

.input-group .form-control:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.input-group .form-control:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: 0 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.input-group-text:first-child {
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.input-group-text:last-child {
    border-left: none;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ==========================================================================
   10. Buttons & Interactive Elements
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
}

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

.btn-success:hover:not(:disabled) {
    background-color: #059669;
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #d97706;
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
    border-color: var(--text-muted);
}

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

.btn-outline-primary:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: white;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
}

.btn-icon.btn-sm {
    width: 32px;
    height: 32px;
}

/* ==========================================================================
   11. Utilities
   ========================================================================== */

/* Spacing */
.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: 3rem; }

.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: 3rem; }

/* Text */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-danger { color: var(--danger-color); }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-grid { display: grid; }

.flex-wrap { flex-wrap: wrap; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* Grid */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -0.75rem;
}

.col {
    flex: 1;
    padding: 0.75rem;
}

.col-12 { flex: 0 0 100%; max-width: 100%; padding: 0.75rem; }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0.75rem; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; padding: 0.75rem; }
.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0.75rem; }

@media (min-width: 768px) {
    .col-md-6 { flex: 0 0 50%; max-width: 50%; }
    .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
    .col-md-3 { flex: 0 0 25%; max-width: 25%; }
}

@media (min-width: 992px) {
    .col-lg-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
    .col-lg-6 { flex: 0 0 50%; max-width: 50%; }
    .col-lg-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
    .col-lg-3 { flex: 0 0 25%; max-width: 25%; }
}

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

.alert-success {
    background-color: var(--success-light);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-warning {
    background-color: var(--warning-light);
    color: #92400e;
    border: 1px solid #fcd34d;
}

.alert-danger {
    background-color: var(--danger-light);
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert-info {
    background-color: var(--info-light);
    color: #1e40af;
    border: 1px solid #93c5fd;
}

/* ==========================================================================
   12. Dark Mode
   ========================================================================== */

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --border-light: #475569;
    
    --primary-light: rgba(79, 70, 229, 0.2);
    --success-light: rgba(16, 185, 129, 0.2);
    --warning-light: rgba(245, 158, 11, 0.2);
    --danger-light: rgba(239, 68, 68, 0.2);
    --info-light: rgba(59, 130, 246, 0.2);
}

[data-theme="dark"] .form-control {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control:focus {
    background-color: var(--bg-secondary);
}

[data-theme="dark"] .form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

[data-theme="dark"] .navbar-search-input {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .navbar-search-input:focus {
    background-color: var(--bg-secondary);
}

/* Dark Mode Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle-btn {
    position: relative;
    width: 60px;
    height: 30px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.theme-toggle-btn::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    background-color: var(--warning-color);
    border-radius: 50%;
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-toggle-btn::before {
    transform: translateX(30px);
    background-color: var(--info-color);
}

.theme-toggle-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    transition: opacity var(--transition-fast);
}

.theme-toggle-icon.sun {
    left: 8px;
    color: var(--warning-color);
}

.theme-toggle-icon.moon {
    right: 8px;
    color: var(--text-muted);
}

[data-theme="dark"] .theme-toggle-icon.sun {
    opacity: 0.3;
}

[data-theme="dark"] .theme-toggle-icon.moon {
    color: var(--info-color);
}

/* ==========================================================================
   13. Responsive Styles
   ========================================================================== */

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .navbar {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        margin-right: 1rem;
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }
    
    .sidebar.active + .sidebar-overlay {
        display: block;
    }
}

@media (max-width: 575.98px) {
    .content-wrapper {
        padding: 1rem;
        padding-top: calc(var(--navbar-height) + 1rem);
    }
    
    .page-title {
        font-size: 1.25rem;
    }
    
    .stat-card {
        padding: 1.25rem;
    }
    
    .stat-card-value {
        font-size: 1.5rem;
    }
    
    .card-header,
    .card-body {
        padding: 1rem;
    }
    
    .navbar-search {
        display: none;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .table-actions {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .content-wrapper {
        padding: 0 !important;
    }
}

/* ==========================================================================
   14. Login Page Styles
   ========================================================================== */

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.auth-header {
    text-align: center;
    padding: 2rem 2rem 1.5rem;
}

.auth-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    margin: 0 auto 1rem;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.auth-body {
    padding: 0 2rem 2rem;
}

.auth-footer {
    text-align: center;
    padding: 1.5rem 2rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.auth-divider span {
    padding: 0 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.social-login {
    display: flex;
    gap: 0.75rem;
}

.social-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.social-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-muted);
}

/* Password Toggle */
.password-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast);
}

.password-toggle:hover {
    color: var(--text-primary);
}

/* Remember Me & Forgot Password */
.auth-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.forgot-link {
    font-size: 0.875rem;
    color: var(--primary-color);
}

.forgot-link:hover {
    text-decoration: underline;
}