/*
╔══════════════════════════════════════════════════════════════════════════════╗
║  SkillsSphere Institute Management - Enterprise Design System v2.0          ║
║  Professional UI Framework for Business Applications                         ║
╚══════════════════════════════════════════════════════════════════════════════╝
*/

/* ============================================================================
   1. CSS VARIABLES - DESIGN TOKENS
   ============================================================================ */

:root {
  /* === Brand Colors (From Logo) === */
  --color-black-main: #1E1E1E;
  --color-black-deep: #040404;
  --color-gold-primary: #C7AB77;
  --color-gold-light: #DFC78C;
  --color-gold-highlight: #F3E4A1;
  --color-gold-dark: #908266;
  
  /* === Semantic Colors === */
  --color-primary: #C7AB77;
  --color-primary-light: #DFC78C;
  --color-primary-dark: #908266;
  --color-secondary: #1E1E1E;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #3B82F6;
  
  /* === Neutral Palette === */
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  
  /* === Typography === */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'Fira Code', 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* === Spacing === */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  
  /* === Border Radius === */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;
  
  /* === Shadows === */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-gold: 0 4px 14px 0 rgba(199, 171, 119, 0.39);
  
  /* === Transitions === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* === Z-Index Scale === */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* === Layout === */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 70px;
  --header-height: 70px;
  --content-max-width: 1400px;
}

/* === Dark Mode Variables === */
[data-theme="dark"] {
  --color-primary: #DFC78C;
  --color-secondary: #F9FAFB;
  --color-background: #0F172A;
  --color-surface: #1E293B;
  --color-text: #F1F5F9;
  --color-text-secondary: #CBD5E1;
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

/* ============================================================================
   2. BASE STYLES & RESET
   ============================================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  min-height: 100vh;
}

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-black-main);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-gray-700);
}

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

a:hover {
  color: var(--color-gold-dark);
}

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--color-gold-primary); }
.text-secondary { color: var(--color-gray-600); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-gray-500); }

/* ============================================================================
   4. BUTTON SYSTEM
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  user-select: none;
}

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

/* Primary Button - Gold */
.btn-primary {
  background: linear-gradient(135deg, var(--color-gold-primary) 0%, var(--color-gold-dark) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-gold);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(199, 171, 119, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary Button - Black */
.btn-secondary {
  background-color: var(--color-black-main);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-black-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Outline Primary */
.btn-outline-primary {
  background-color: transparent;
  border-color: var(--color-gold-primary);
  color: var(--color-gold-primary);
}

.btn-outline-primary:hover:not(:disabled) {
  background-color: var(--color-gold-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* Success Button */
.btn-success {
  background-color: var(--color-success);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
  background-color: #059669;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning {
  background-color: var(--color-warning);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-warning:hover:not(:disabled) {
  background-color: #D97706;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Danger Button */
.btn-danger {
  background-color: var(--color-danger);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
  background-color: #DC2626;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-lg);
}

.btn-icon-sm {
  width: 32px;
  height: 32px;
  padding: 0;
}

/* ============================================================================
   5. FORM ELEMENTS
   ============================================================================ */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

.form-label-required::after {
  content: '*';
  color: var(--color-danger);
  margin-left: var(--space-1);
}

.form-control,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.form-control:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-gold-primary);
  box-shadow: 0 0 0 3px rgba(199, 171, 119, 0.1);
}

.form-control:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-gray-100);
  cursor: not-allowed;
  opacity: 0.6;
}

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

.form-control.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-control.is-valid {
  border-color: var(--color-success);
}

.form-control.is-valid:focus {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.invalid-feedback,
.valid-feedback {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
}

.invalid-feedback {
  color: var(--color-danger);
}

.valid-feedback {
  color: var(--color-success);
}

.input-group {
  display: flex;
  align-items: stretch;
}

.input-group .form-control {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.input-group-text {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  background-color: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
  border-right: 0;
  border-top-left-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-lg);
  color: var(--color-gray-600);
}

/* ============================================================================
   6. CARD COMPONENTS
   ============================================================================ */

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  overflow: hidden;
  transition: all var(--transition-base);
}

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

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-gray-200);
  background: linear-gradient(135deg, rgba(199, 171, 119, 0.05) 0%, rgba(144, 130, 102, 0.05) 100%);
}

.card-header h1,
.card-header h2,
.card-header h3,
.card-header h4,
.card-header h5,
.card-header h6 {
  margin-bottom: 0;
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-gray-200);
  background-color: var(--color-gray-50);
}

/* Stats Card */
.stat-card {
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-50) 100%);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.stat-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-4);
}

.stat-card-icon.gold {
  background: linear-gradient(135deg, var(--color-gold-light) 0%, var(--color-gold-primary) 100%);
  color: var(--color-white);
}

.stat-card-icon.success {
  background: linear-gradient(135deg, #34D399 0%, var(--color-success) 100%);
  color: var(--color-white);
}

.stat-card-icon.danger {
  background: linear-gradient(135deg, #F87171 0%, var(--color-danger) 100%);
  color: var(--color-white);
}

.stat-card-icon.info {
  background: linear-gradient(135deg, #60A5FA 0%, var(--color-info) 100%);
  color: var(--color-white);
}

.stat-card-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-black-main);
  margin-bottom: var(--space-2);
}

.stat-card-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  font-weight: var(--font-weight-medium);
}

/* ============================================================================
   7. TABLE STYLES
   ============================================================================ */

.table-container {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table thead {
  background: linear-gradient(135deg, rgba(199, 171, 119, 0.1) 0%, rgba(144, 130, 102, 0.1) 100%);
}

.table thead th {
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-black-main);
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--color-gold-primary);
}

.table tbody tr {
  border-bottom: 1px solid var(--color-gray-200);
  transition: background-color var(--transition-fast);
}

.table tbody tr:nth-child(even) {
  background-color: var(--color-gray-50);
}

.table tbody tr:hover {
  background-color: rgba(199, 171, 119, 0.05);
}

.table tbody td {
  padding: var(--space-4) var(--space-5);
  color: var(--color-gray-700);
}

.table tbody td:first-child {
  font-weight: var(--font-weight-medium);
  color: var(--color-black-main);
}

/* ============================================================================
   8. BADGE COMPONENTS
   ============================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background-color: rgba(199, 171, 119, 0.1);
  color: var(--color-gold-dark);
  border: 1px solid rgba(199, 171, 119, 0.3);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: #D97706;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: #DC2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-info {
  background-color: rgba(59, 130, 246, 0.1);
  color: #2563EB;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-secondary {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-300);
}

/* ============================================================================
   9. ALERT COMPONENTS
   ============================================================================ */

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: start;
  gap: var(--space-3);
}

.alert-icon {
  font-size: var(--font-size-lg);
  margin-top: 2px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-left-color: var(--color-success);
  color: #065F46;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-left-color: var(--color-warning);
  color: #92400E;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-left-color: var(--color-danger);
  color: #991B1B;
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  border-left-color: var(--color-info);
  color: #1E40AF;
}

/* ============================================================================
   10. NAVIGATION COMPONENTS
   ============================================================================ */

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, var(--color-black-deep) 0%, var(--color-black-main) 100%);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-fixed);
  overflow-y: auto;
  transition: transform var(--transition-base);
}

.sidebar-header {
  padding: var(--space-6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-white);
  text-decoration: none;
}

.sidebar-logo img {
  height: 40px;
  width: auto;
}

.sidebar-logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-gold-highlight) 0%, var(--color-gold-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-nav {
  padding: var(--space-4);
}

.nav-section-title {
  padding: var(--space-4) var(--space-4) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-item {
  margin-bottom: var(--space-1);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  transform: translateX(4px);
}

.nav-link.active {
  background: linear-gradient(135deg, var(--color-gold-primary) 0%, var(--color-gold-dark) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-gold);
}

.nav-link-icon {
  font-size: var(--font-size-lg);
  width: 24px;
  text-align: center;
}

/* Top Header */
.top-header {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  padding: 0 var(--space-8);
}

.header-search {
  flex: 1;
  max-width: 500px;
}

.header-search input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236B7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 12px center;
  background-size: 20px 20px;
}

.header-search input:focus {
  outline: none;
  border-color: var(--color-gold-primary);
  box-shadow: 0 0 0 3px rgba(199, 171, 119, 0.1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: auto;
}

.header-notification,
.header-user {
  position: relative;
}

.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 18px;
  height: 18px;
  background-color: var(--color-danger);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  border: 2px solid var(--color-white);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-gold-primary) 0%, var(--color-gold-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--transition-base);
}

.user-avatar:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-gold);
}

/* Main Content Area */
.main-content {
  margin-left: var(--sidebar-width);
  margin-top: var(--header-height);
  padding: var(--space-8);
  min-height: calc(100vh - var(--header-height));
}

/* ============================================================================
   11. UTILITY CLASSES
   ============================================================================ */

/* Spacing */
.m-0 { margin: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

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

/* Flexbox */
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.justify-content-end { justify-content: end; }
.align-items-center { align-items: center; }
.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Grid */
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Border Radius */
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }

/* ============================================================================
   12. RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 1024px) {
  :root {
    --sidebar-width: 70px;
  }
  
  .sidebar-logo-text,
  .nav-link span,
  .nav-section-title {
    display: none;
  }
  
  .nav-link {
    justify-content: center;
  }
  
  .main-content {
    margin-left: 70px;
  }
  
  .top-header {
    left: 70px;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.show {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .top-header {
    left: 0;
  }
  
  .header-search {
    display: none;
  }
}

/* ============================================================================
   13. ANIMATIONS
   ============================================================================ */

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

@keyframes slideInLeft {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-slide-in {
  animation: slideInLeft 0.5s ease-out;
}

/* ============================================================================
   14. PRINT STYLES
   ============================================================================ */

@media print {
  .sidebar,
  .top-header,
  .btn,
  .header-actions {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0;
    margin-top: 0;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid var(--color-gray-300);
  }
}