@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Poppins:wght@600;700&display=swap');

/* ============================================================================
   CSS CUSTOM PROPERTIES
   ============================================================================ */

:root {
  /* Color Palette */
  --color-primary: #0066cc;
  --color-primary-dark: #0052a3;
  --color-primary-light: #e6f2ff;
  --color-secondary: #ff8800;
  --color-secondary-dark: #cc6600;
  --color-secondary-light: #fff4e6;
  --color-accent: #6366f1;
  --color-accent-light: #eef2ff;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;
  --color-error: #ef4444;
  --color-error-light: #fee2e2;

  /* Background & Surface */
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-surface: #1e293b;
  --color-surface-elevated: #334155;

  /* Text Colors */
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;

  /* Borders & Dividers */
  --color-border: #475569;
  --color-border-light: #64748b;
  --color-divider: #334155;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --font-size-base: 14px;
  --font-size-sm: 13px;
  --font-size-xs: 12px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;

  --line-height-tight: 1.4;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Heading Sizes */
  --font-size-h1: 32px;
  --font-size-h2: 28px;
  --font-size-h3: 24px;
  --font-size-h4: 20px;
  --font-size-h5: 16px;
  --font-size-h6: 14px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-dropdown: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-modal: 0 20px 40px rgba(0, 0, 0, 0.3);

  /* Border Radius */
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-full: 9999px;

  /* Spacing Scale */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --spacing-3xl: 48px;

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-width-collapsed: 80px;
  --navbar-height: 64px;
  --max-content-width: 1400px;
  --gutter: 32px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin: var(--spacing-lg) 0 var(--spacing-md) 0;
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }
h5 { font-size: var(--font-size-h5); }
h6 { font-size: var(--font-size-h6); }

p {
  margin: 0 0 var(--spacing-md) 0;
}

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

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Lists */
ul, ol {
  margin: 0 0 var(--spacing-md) var(--spacing-lg);
  padding-left: var(--spacing-lg);
}

ul ul, ul ol, ol ul, ol ol {
  margin-bottom: 0;
}

li {
  margin-bottom: var(--spacing-sm);
}

/* ============================================================================
   LAYOUT STRUCTURE
   ============================================================================ */

.layout {
  display: grid;
  grid-template-areas:
    "sidebar navbar"
    "sidebar main";
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--navbar-height) 1fr;
  min-height: 100vh;
}

.sidebar {
  grid-area: sidebar;
  background-color: var(--color-bg-primary);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
  transition: transform var(--transition-base);
}

.navbar {
  grid-area: navbar;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 99;
}

.main-content {
  grid-area: main;
  background-color: var(--color-bg-primary);
  overflow-y: auto;
  padding: var(--spacing-xl);
}

.container {
  max-width: var(--max-content-width);
  margin: 0 auto;
}

/* ============================================================================
   NAVIGATION
   ============================================================================ */

.nav {
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: var(--spacing-lg) 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-base);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  border-left: 3px solid transparent;
}

.nav-link:hover {
  background-color: rgba(0, 102, 204, 0.1);
  color: var(--color-text-primary);
  border-left-color: var(--color-primary);
}

.nav-link.active {
  background-color: rgba(0, 102, 204, 0.15);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

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

/* Navbar Top */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--color-primary);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-menu-item {
  position: relative;
}

.navbar-menu-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-base);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-menu-link:hover {
  color: var(--color-text-primary);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-left: auto;
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

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

.btn:hover {
  transform: translateY(-1px);
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-card);
}

.btn-primary:active {
  background-color: #003d7a;
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-secondary);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  box-shadow: var(--shadow-card);
}

.btn-secondary:active {
  background-color: #994400;
}

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

.btn-danger:hover {
  background-color: #dc2626;
  box-shadow: var(--shadow-card);
}

.btn-danger:active {
  background-color: #b91c1c;
}

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

.btn-success:hover {
  background-color: #059669;
  box-shadow: var(--shadow-card);
}

.btn-success:active {
  background-color: #047857;
}

/* Ghost/Outline Button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background-color: rgba(0, 102, 204, 0.1);
  border-color: var(--color-primary);
}

/* Small Button */
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* Large Button */
.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* Full Width Button */
.btn-block {
  display: flex;
  width: 100%;
}

/* Button Group */
.btn-group {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-group-vertical {
  flex-direction: column;
}

/* ============================================================================
   FORMS
   ============================================================================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-label.required::after {
  content: ' *';
  color: var(--color-error);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:hover,
.form-textarea:hover,
.form-select:hover {
  border-color: var(--color-border-light);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-tertiary);
}

.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-tertiary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-primary);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23cbd5e1' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  padding-right: 32px;
}

/* Form Validation States */
.form-input.is-invalid,
.form-textarea.is-invalid,
.form-select.is-invalid {
  border-color: var(--color-error);
}

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

.form-input.is-valid,
.form-textarea.is-valid,
.form-select.is-valid {
  border-color: var(--color-success);
}

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

.form-text {
  display: block;
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.form-error {
  display: block;
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-error);
  font-weight: var(--font-weight-medium);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.form-row-3 {
  grid-template-columns: repeat(3, 1fr);
}

.form-col {
  grid-column: span 1;
}

.form-col-2 {
  grid-column: span 2;
}

/* ============================================================================
   CARDS
   ============================================================================ */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

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

.card-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-divider);
}

.card-header h2,
.card-header h3 {
  margin: 0;
}

.card-body {
  margin-bottom: var(--spacing-lg);
}

.card-body:last-child {
  margin-bottom: 0;
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-divider);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin: var(--spacing-sm) 0 0 0;
}

.card-stat {
  text-align: center;
  padding: var(--spacing-xl);
}

.card-stat-value {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

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

/* ============================================================================
   ALERTS
   ============================================================================ */

.alert {
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  border: 1px solid;
  border-radius: var(--border-radius);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.alert-content {
  flex: 1;
  line-height: var(--line-height-relaxed);
}

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

.alert-close {
  flex-shrink: 0;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
  padding: 0;
  transition: opacity var(--transition-fast);
}

.alert-close:hover {
  opacity: 0.7;
}

/* Success Alert */
.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: #d1fae5;
}

.alert-success .alert-title {
  color: var(--color-success);
}

/* Warning Alert */
.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
  color: #fef3c7;
}

.alert-warning .alert-title {
  color: var(--color-warning);
}

/* Error Alert */
.alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: #fecaca;
}

.alert-error .alert-title {
  color: var(--color-error);
}

/* Info Alert */
.alert-info {
  background-color: rgba(0, 102, 204, 0.1);
  border-color: var(--color-primary);
  color: #bfdbfe;
}

.alert-info .alert-title {
  color: var(--color-primary);
}

/* ============================================================================
   TABLES
   ============================================================================ */

.table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  font-size: var(--font-size-base);
}

.table thead {
  background-color: var(--color-surface-elevated);
  border-bottom: 2px solid var(--color-border);
}

.table th {
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
}

.table td {
  padding: var(--spacing-md) var(--spacing-md);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text-secondary);
}

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

.table tbody tr:hover {
  background-color: rgba(0, 102, 204, 0.05);
}

.table tbody tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.15);
}

.table tbody tr:nth-child(even):hover {
  background-color: rgba(0, 102, 204, 0.08);
}

.table-striped tbody tr:nth-child(odd) {
  background-color: transparent;
}

.table-responsive {
  overflow-x: auto;
  margin-bottom: var(--spacing-xl);
}

.table-responsive table {
  min-width: 100%;
}

.table-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ============================================================================
   BADGES
   ============================================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--border-radius-full);
  white-space: nowrap;
}

/* Badge Primary */
.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Badge Secondary */
.badge-secondary {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary);
}

/* Badge Success */
.badge-success {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

/* Badge Warning */
.badge-warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

/* Badge Error */
.badge-error {
  background-color: var(--color-error-light);
  color: var(--color-error);
}

/* Badge Accent */
.badge-accent {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

/* Outline Badge */
.badge-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

/* ============================================================================
   PAGE HEADER
   ============================================================================ */

.page-header {
  margin-bottom: var(--spacing-2xl);
}

.page-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-sm) 0;
}

.page-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0;
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  justify-content: space-between;
  margin-top: var(--spacing-lg);
}

/* ============================================================================
   BREADCRUMBS
   ============================================================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0 0 var(--spacing-xl) 0;
  padding: 0;
  font-size: var(--font-size-sm);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item::after {
  content: '/';
  color: var(--color-text-tertiary);
  margin: 0 var(--spacing-sm);
}

.breadcrumb-item:last-child::after {
  display: none;
}

.breadcrumb-link {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-primary-dark);
}

.breadcrumb-item.active {
  color: var(--color-text-secondary);
}

/* ============================================================================
   MODALS / DIALOGS
   ============================================================================ */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-modal);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--spacing-2xl);
}

.modal-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
  padding: 0;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text-primary);
}

.modal-body {
  margin-bottom: var(--spacing-xl);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-divider);
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }

.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-primary-color { color: var(--color-primary); }

.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); }

.font-normal { font-weight: var(--font-weight-normal); }
.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-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-error { background-color: var(--color-error); }

.border-primary { border-color: var(--color-primary); }
.border-secondary { border-color: var(--color-secondary); }
.border-success { border-color: var(--color-success); }
.border-warning { border-color: var(--color-warning); }
.border-error { border-color: var(--color-error); }

.m-0 { margin: 0; }
.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.flex { display: flex; }
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-full { border-radius: var(--border-radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-card { box-shadow: var(--shadow-card); }
.shadow-card-hover { box-shadow: var(--shadow-card-hover); }

.cursor-pointer { cursor: pointer; }
.cursor-default { cursor: default; }
.cursor-not-allowed { cursor: not-allowed; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.hidden { display: none !important; }
.invisible { visibility: hidden; }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-1 { overflow: hidden; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; }
.line-clamp-2 { overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.line-clamp-3 { overflow: hidden; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0;
    --font-size-h1: 28px;
    --font-size-h2: 24px;
    --font-size-h3: 20px;
  }

  .layout {
    grid-template-areas:
      "navbar"
      "main";
    grid-template-columns: 1fr;
    grid-template-rows: var(--navbar-height) 1fr;
  }

  .sidebar {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--navbar-height));
    z-index: 99;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .sidebar.mobile-open {
    display: flex;
    flex-direction: column;
  }

  .main-content {
    padding: var(--spacing-lg);
  }

  .navbar {
    padding: 0 var(--spacing-lg);
  }

  .form-row,
  .form-row-3 {
    grid-template-columns: 1fr;
  }

  .form-col-2 {
    grid-column: span 1;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    width: 100%;
  }

  .table-responsive {
    margin-left: calc(-1 * var(--spacing-lg));
    margin-right: calc(-1 * var(--spacing-lg));
    padding: 0 var(--spacing-lg);
  }

  .modal-content {
    width: 95%;
    max-height: 95vh;
  }

  .page-header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-md);
  }

  .page-header-actions .btn,
  .page-header-actions .btn-group {
    width: 100%;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 12px;
    --spacing-xl: 16px;
  }

  h1, h2, h3, h4, h5, h6 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
  }

  .card {
    padding: var(--spacing-lg);
  }

  .navbar {
    padding: 0 var(--spacing-md);
  }

  .navbar-menu {
    gap: var(--spacing-md);
  }

  .main-content {
    padding: var(--spacing-md);
  }

  .page-title {
    font-size: var(--font-size-h3);
  }

  .alert {
    flex-direction: column;
  }

  .alert-icon {
    margin-top: 0;
  }

  .table {
    font-size: var(--font-size-sm);
  }

  .table th,
  .table td {
    padding: var(--spacing-sm);
  }

  .modal-content {
    padding: var(--spacing-lg);
  }
}