/**
 * Smart AI Widget - Enterprise Design System
 * Version: 1.0.0
 *
 * This file provides a comprehensive design system for enterprise-grade UI/UX.
 * Include this file AFTER styles.css to extend the base styles.
 *
 * Contents:
 * 1. CSS Variables (Colors, Typography, Spacing, Shadows)
 * 2. Typography System
 * 3. Button Components
 * 4. Form Components
 * 5. Card Components
 * 6. Badge & Tag Components
 * 7. Modal & Dialog Components
 * 8. Table Components
 * 9. Navigation Components
 * 10. Alert & Notification Components
 * 11. Loading & Skeleton States
 * 12. Empty States
 * 13. Utility Classes
 * 14. Animations
 * 15. Accessibility
 */

/* ==========================================================================
   1. CSS VARIABLES
   ========================================================================== */

:root {
  /* Primary Colors */
  --ds-primary-50: #EEF2FF;
  --ds-primary-100: #E0E7FF;
  --ds-primary-200: #C7D2FE;
  --ds-primary-300: #A5B4FC;
  --ds-primary-400: #818CF8;
  --ds-primary-500: #667eea;
  --ds-primary-600: #4F46E5;
  --ds-primary-700: #4338CA;
  --ds-primary-800: #3730A3;
  --ds-primary-900: #312E81;

  /* Neutral Colors */
  --ds-gray-50: #F9FAFB;
  --ds-gray-100: #F3F4F6;
  --ds-gray-200: #E5E7EB;
  --ds-gray-300: #D1D5DB;
  --ds-gray-400: #9CA3AF;
  --ds-gray-500: #6B7280;
  --ds-gray-600: #4B5563;
  --ds-gray-700: #374151;
  --ds-gray-800: #1F2937;
  --ds-gray-900: #111827;

  /* Semantic Colors - Success */
  --ds-success-50: #ECFDF5;
  --ds-success-100: #D1FAE5;
  --ds-success-200: #A7F3D0;
  --ds-success-500: #10B981;
  --ds-success-600: #059669;
  --ds-success-700: #047857;

  /* Semantic Colors - Error */
  --ds-error-50: #FEF2F2;
  --ds-error-100: #FEE2E2;
  --ds-error-200: #FECACA;
  --ds-error-500: #EF4444;
  --ds-error-600: #DC2626;
  --ds-error-700: #B91C1C;

  /* Semantic Colors - Warning */
  --ds-warning-50: #FFFBEB;
  --ds-warning-100: #FEF3C7;
  --ds-warning-200: #FDE68A;
  --ds-warning-500: #F59E0B;
  --ds-warning-600: #D97706;
  --ds-warning-700: #B45309;

  /* Semantic Colors - Info */
  --ds-info-50: #EFF6FF;
  --ds-info-100: #DBEAFE;
  --ds-info-200: #BFDBFE;
  --ds-info-500: #3B82F6;
  --ds-info-600: #2563EB;
  --ds-info-700: #1D4ED8;

  /* Typography */
  --ds-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --ds-font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;

  /* Font Sizes */
  --ds-text-xs: 11px;
  --ds-text-sm: 12px;
  --ds-text-base: 14px;
  --ds-text-md: 15px;
  --ds-text-lg: 16px;
  --ds-text-xl: 18px;
  --ds-text-2xl: 20px;
  --ds-text-3xl: 24px;
  --ds-text-4xl: 30px;
  --ds-text-5xl: 36px;

  /* Font Weights */
  --ds-font-normal: 400;
  --ds-font-medium: 500;
  --ds-font-semibold: 600;
  --ds-font-bold: 700;

  /* Line Heights */
  --ds-leading-tight: 1.25;
  --ds-leading-snug: 1.375;
  --ds-leading-normal: 1.5;
  --ds-leading-relaxed: 1.625;

  /* Spacing Scale */
  --ds-space-0: 0;
  --ds-space-1: 4px;
  --ds-space-2: 8px;
  --ds-space-3: 12px;
  --ds-space-4: 16px;
  --ds-space-5: 20px;
  --ds-space-6: 24px;
  --ds-space-8: 32px;
  --ds-space-10: 40px;
  --ds-space-12: 48px;
  --ds-space-16: 64px;

  /* Border Radius */
  --ds-radius-sm: 4px;
  --ds-radius-md: 6px;
  --ds-radius-lg: 8px;
  --ds-radius-xl: 12px;
  --ds-radius-2xl: 16px;
  --ds-radius-full: 9999px;

  /* Shadows */
  --ds-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --ds-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --ds-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --ds-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --ds-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --ds-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --ds-shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --ds-shadow-focus: 0 0 0 3px rgba(102, 126, 234, 0.25);
  --ds-shadow-focus-error: 0 0 0 3px rgba(239, 68, 68, 0.25);

  /* Transitions */
  --ds-transition-fast: 150ms ease;
  --ds-transition-base: 200ms ease;
  --ds-transition-slow: 300ms ease;

  /* Z-Index Scale */
  --ds-z-dropdown: 1000;
  --ds-z-sticky: 1020;
  --ds-z-fixed: 1030;
  --ds-z-modal-backdrop: 1040;
  --ds-z-modal: 1050;
  --ds-z-popover: 1060;
  --ds-z-tooltip: 1070;
  --ds-z-toast: 1080;
}

/* ==========================================================================
   2. TYPOGRAPHY SYSTEM
   ========================================================================== */

/* Headings */
.ds-h1 {
  font-size: var(--ds-text-5xl);
  font-weight: var(--ds-font-bold);
  line-height: var(--ds-leading-tight);
  color: var(--ds-gray-900);
  letter-spacing: -0.025em;
}

.ds-h2 {
  font-size: var(--ds-text-4xl);
  font-weight: var(--ds-font-bold);
  line-height: var(--ds-leading-tight);
  color: var(--ds-gray-900);
  letter-spacing: -0.025em;
}

.ds-h3 {
  font-size: var(--ds-text-3xl);
  font-weight: var(--ds-font-semibold);
  line-height: var(--ds-leading-snug);
  color: var(--ds-gray-900);
}

.ds-h4 {
  font-size: var(--ds-text-2xl);
  font-weight: var(--ds-font-semibold);
  line-height: var(--ds-leading-snug);
  color: var(--ds-gray-900);
}

.ds-h5 {
  font-size: var(--ds-text-xl);
  font-weight: var(--ds-font-semibold);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-900);
}

.ds-h6 {
  font-size: var(--ds-text-lg);
  font-weight: var(--ds-font-semibold);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-900);
}

/* Body Text */
.ds-body-lg {
  font-size: var(--ds-text-lg);
  line-height: var(--ds-leading-relaxed);
  color: var(--ds-gray-600);
}

.ds-body {
  font-size: var(--ds-text-base);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-600);
}

.ds-body-sm {
  font-size: var(--ds-text-sm);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-500);
}

/* Caption & Labels */
.ds-caption {
  font-size: var(--ds-text-xs);
  font-weight: var(--ds-font-medium);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ds-label {
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  line-height: var(--ds-leading-normal);
  color: var(--ds-gray-700);
}

/* Text Colors */
.ds-text-primary { color: var(--ds-primary-600); }
.ds-text-success { color: var(--ds-success-600); }
.ds-text-error { color: var(--ds-error-600); }
.ds-text-warning { color: var(--ds-warning-600); }
.ds-text-info { color: var(--ds-info-600); }
.ds-text-muted { color: var(--ds-gray-500); }

/* ==========================================================================
   3. BUTTON COMPONENTS
   ========================================================================== */

/* Base Button */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-2);
  font-family: var(--ds-font-family);
  font-weight: var(--ds-font-semibold);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--ds-transition-base);
  white-space: nowrap;
  user-select: none;
}

.ds-btn:focus {
  outline: none;
  box-shadow: var(--ds-shadow-focus);
}

.ds-btn:disabled,
.ds-btn.ds-btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Sizes */
.ds-btn-xs {
  padding: 6px 10px;
  font-size: var(--ds-text-xs);
  border-radius: var(--ds-radius-md);
  min-height: 28px;
}

.ds-btn-sm {
  padding: 8px 14px;
  font-size: var(--ds-text-sm);
  border-radius: var(--ds-radius-md);
  min-height: 32px;
}

.ds-btn-md {
  padding: 10px 18px;
  font-size: var(--ds-text-base);
  border-radius: var(--ds-radius-lg);
  min-height: 40px;
}

.ds-btn-lg {
  padding: 12px 24px;
  font-size: var(--ds-text-lg);
  border-radius: var(--ds-radius-lg);
  min-height: 48px;
}

/* Primary Button */
.ds-btn-primary {
  background: linear-gradient(135deg, var(--ds-primary-500) 0%, var(--ds-primary-600) 100%);
  color: white;
  box-shadow: 0 1px 3px rgba(102, 126, 234, 0.3);
}

.ds-btn-primary:hover {
  background: linear-gradient(135deg, var(--ds-primary-600) 0%, var(--ds-primary-700) 100%);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
  transform: translateY(-1px);
}

.ds-btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 3px rgba(102, 126, 234, 0.3);
}

/* Secondary Button */
.ds-btn-secondary {
  background: white;
  color: var(--ds-gray-700);
  border: 1px solid var(--ds-gray-300);
  box-shadow: var(--ds-shadow-xs);
}

.ds-btn-secondary:hover {
  background: var(--ds-gray-50);
  border-color: var(--ds-gray-400);
}

.ds-btn-secondary:active {
  background: var(--ds-gray-100);
}

/* Outline Button */
.ds-btn-outline {
  background: transparent;
  color: var(--ds-primary-600);
  border: 2px solid var(--ds-primary-500);
}

.ds-btn-outline:hover {
  background: var(--ds-primary-50);
  border-color: var(--ds-primary-600);
}

.ds-btn-outline:active {
  background: var(--ds-primary-100);
}

/* Ghost Button */
.ds-btn-ghost {
  background: transparent;
  color: var(--ds-gray-600);
  border: none;
}

.ds-btn-ghost:hover {
  background: var(--ds-gray-100);
  color: var(--ds-gray-800);
}

.ds-btn-ghost:active {
  background: var(--ds-gray-200);
}

/* Danger Button */
.ds-btn-danger {
  background: linear-gradient(135deg, var(--ds-error-500) 0%, var(--ds-error-600) 100%);
  color: white;
  box-shadow: 0 1px 3px rgba(239, 68, 68, 0.3);
}

.ds-btn-danger:hover {
  background: linear-gradient(135deg, var(--ds-error-600) 0%, var(--ds-error-700) 100%);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
  transform: translateY(-1px);
}

.ds-btn-danger:focus {
  box-shadow: var(--ds-shadow-focus-error);
}

/* Danger Outline Button */
.ds-btn-danger-outline {
  background: transparent;
  color: var(--ds-error-600);
  border: 2px solid var(--ds-error-500);
}

.ds-btn-danger-outline:hover {
  background: var(--ds-error-50);
  border-color: var(--ds-error-600);
}

/* Success Button */
.ds-btn-success {
  background: linear-gradient(135deg, var(--ds-success-500) 0%, var(--ds-success-600) 100%);
  color: white;
  box-shadow: 0 1px 3px rgba(16, 185, 129, 0.3);
}

.ds-btn-success:hover {
  background: linear-gradient(135deg, var(--ds-success-600) 0%, var(--ds-success-700) 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

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

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

.ds-btn-icon.ds-btn-lg {
  width: 48px;
  height: 48px;
}

/* Loading Button */
.ds-btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.ds-btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: ds-spin 0.6s linear infinite;
}

.ds-btn-primary.ds-btn-loading::after,
.ds-btn-danger.ds-btn-loading::after,
.ds-btn-success.ds-btn-loading::after {
  border-color: white;
  border-right-color: transparent;
}

/* Full Width Button */
.ds-btn-full {
  width: 100%;
}

/* Button Group */
.ds-btn-group {
  display: inline-flex;
}

.ds-btn-group .ds-btn {
  border-radius: 0;
}

.ds-btn-group .ds-btn:first-child {
  border-radius: var(--ds-radius-lg) 0 0 var(--ds-radius-lg);
}

.ds-btn-group .ds-btn:last-child {
  border-radius: 0 var(--ds-radius-lg) var(--ds-radius-lg) 0;
}

.ds-btn-group .ds-btn:not(:last-child) {
  border-right: none;
}

/* ==========================================================================
   4. FORM COMPONENTS
   ========================================================================== */

/* Form Group */
.ds-form-group {
  margin-bottom: var(--ds-space-5);
}

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

.ds-form-label-required::after {
  content: ' *';
  color: var(--ds-error-500);
}

/* Form Input */
.ds-input {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--ds-text-base);
  font-family: var(--ds-font-family);
  color: var(--ds-gray-900);
  background: white;
  border: 1px solid var(--ds-gray-300);
  border-radius: var(--ds-radius-lg);
  transition: all var(--ds-transition-base);
  outline: none;
}

.ds-input::placeholder {
  color: var(--ds-gray-400);
}

.ds-input:hover {
  border-color: var(--ds-gray-400);
}

.ds-input:focus {
  border-color: var(--ds-primary-500);
  box-shadow: var(--ds-shadow-focus);
}

.ds-input:disabled {
  background: var(--ds-gray-100);
  color: var(--ds-gray-500);
  cursor: not-allowed;
}

.ds-input:read-only {
  background: var(--ds-gray-50);
  cursor: default;
}

/* Input Sizes */
.ds-input-sm {
  padding: 8px 12px;
  font-size: var(--ds-text-sm);
}

.ds-input-lg {
  padding: 14px 16px;
  font-size: var(--ds-text-lg);
}

/* Input with Icon */
.ds-input-wrapper {
  position: relative;
}

.ds-input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ds-gray-400);
  pointer-events: none;
}

.ds-input-wrapper .ds-input {
  padding-left: 42px;
}

.ds-input-icon-right {
  left: auto;
  right: 14px;
}

.ds-input-wrapper .ds-input.ds-input-icon-right {
  padding-left: 14px;
  padding-right: 42px;
}

/* Input Error State */
.ds-input-error {
  border-color: var(--ds-error-500);
}

.ds-input-error:focus {
  border-color: var(--ds-error-500);
  box-shadow: var(--ds-shadow-focus-error);
}

/* Input Success State */
.ds-input-success {
  border-color: var(--ds-success-500);
}

/* Form Help Text */
.ds-form-hint {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  margin-top: var(--ds-space-1);
}

/* Form Error Text */
.ds-form-error {
  font-size: var(--ds-text-sm);
  color: var(--ds-error-600);
  margin-top: var(--ds-space-1);
  display: flex;
  align-items: center;
  gap: var(--ds-space-1);
}

/* Textarea */
.ds-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Select */
.ds-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%236B7280' 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 12px center;
  background-size: 16px;
  padding-right: 40px;
  cursor: pointer;
}

/* Checkbox */
.ds-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--ds-space-3);
  cursor: pointer;
}

.ds-checkbox-input {
  width: 18px;
  height: 18px;
  border: 2px solid var(--ds-gray-300);
  border-radius: var(--ds-radius-sm);
  appearance: none;
  cursor: pointer;
  transition: all var(--ds-transition-fast);
  flex-shrink: 0;
  margin-top: 2px;
}

.ds-checkbox-input:checked {
  background: var(--ds-primary-500);
  border-color: var(--ds-primary-500);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.ds-checkbox-input:focus {
  box-shadow: var(--ds-shadow-focus);
}

.ds-checkbox-label {
  font-size: var(--ds-text-base);
  color: var(--ds-gray-700);
}

/* Radio */
.ds-radio-input {
  width: 18px;
  height: 18px;
  border: 2px solid var(--ds-gray-300);
  border-radius: 50%;
  appearance: none;
  cursor: pointer;
  transition: all var(--ds-transition-fast);
  flex-shrink: 0;
}

.ds-radio-input:checked {
  border-color: var(--ds-primary-500);
  border-width: 5px;
}

.ds-radio-input:focus {
  box-shadow: var(--ds-shadow-focus);
}

/* Toggle Switch */
.ds-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--ds-gray-300);
  border-radius: var(--ds-radius-full);
  cursor: pointer;
  transition: all var(--ds-transition-base);
}

.ds-toggle.ds-toggle-active {
  background: var(--ds-primary-500);
}

.ds-toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: all var(--ds-transition-base);
  box-shadow: var(--ds-shadow-sm);
}

.ds-toggle.ds-toggle-active .ds-toggle-slider {
  transform: translateX(20px);
}

/* Toggle Group */
.ds-toggle-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--ds-space-4) 0;
  border-bottom: 1px solid var(--ds-gray-200);
}

.ds-toggle-group:last-child {
  border-bottom: none;
}

.ds-toggle-info h4 {
  font-size: var(--ds-text-base);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-800);
  margin: 0 0 var(--ds-space-1) 0;
}

.ds-toggle-info p {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  margin: 0;
}

/* Form Row (2 columns) */
.ds-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--ds-space-4);
}

@media (max-width: 640px) {
  .ds-form-row {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   5. CARD COMPONENTS
   ========================================================================== */

/* Base Card */
.ds-card {
  background: white;
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
  overflow: hidden;
}

/* Card Padding Variants */
.ds-card-xs { padding: var(--ds-space-3); }
.ds-card-sm { padding: var(--ds-space-4); }
.ds-card-md { padding: var(--ds-space-5); }
.ds-card-lg { padding: var(--ds-space-6); }
.ds-card-xl { padding: var(--ds-space-8); }

/* Interactive Card */
.ds-card-interactive {
  transition: all var(--ds-transition-base);
  cursor: pointer;
}

.ds-card-interactive:hover {
  border-color: var(--ds-primary-300);
  box-shadow: var(--ds-shadow-md);
  transform: translateY(-2px);
}

/* Elevated Card */
.ds-card-elevated {
  border: none;
  box-shadow: var(--ds-shadow-md);
}

.ds-card-elevated:hover {
  box-shadow: var(--ds-shadow-lg);
}

/* Card Header */
.ds-card-header {
  padding: var(--ds-space-5);
  border-bottom: 1px solid var(--ds-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ds-card-title {
  font-size: var(--ds-text-lg);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-900);
  margin: 0;
}

.ds-card-subtitle {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  margin-top: var(--ds-space-1);
}

/* Card Body */
.ds-card-body {
  padding: var(--ds-space-5);
}

/* Card Footer */
.ds-card-footer {
  padding: var(--ds-space-4) var(--ds-space-5);
  border-top: 1px solid var(--ds-gray-200);
  background: var(--ds-gray-50);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--ds-space-3);
}

/* Stats Card */
.ds-stat-card {
  background: white;
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
  padding: var(--ds-space-5);
  display: flex;
  align-items: center;
  gap: var(--ds-space-4);
}

.ds-stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--ds-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ds-stat-icon-primary { background: var(--ds-primary-100); color: var(--ds-primary-600); }
.ds-stat-icon-success { background: var(--ds-success-100); color: var(--ds-success-600); }
.ds-stat-icon-warning { background: var(--ds-warning-100); color: var(--ds-warning-600); }
.ds-stat-icon-error { background: var(--ds-error-100); color: var(--ds-error-600); }
.ds-stat-icon-info { background: var(--ds-info-100); color: var(--ds-info-600); }

.ds-stat-content {
  flex: 1;
  min-width: 0;
}

.ds-stat-label {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  margin-bottom: var(--ds-space-1);
}

.ds-stat-value {
  font-size: var(--ds-text-3xl);
  font-weight: var(--ds-font-bold);
  color: var(--ds-gray-900);
  line-height: 1;
}

.ds-stat-change {
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  margin-top: var(--ds-space-1);
}

.ds-stat-change-positive { color: var(--ds-success-600); }
.ds-stat-change-negative { color: var(--ds-error-600); }

/* Section Card (with header icon) */
.ds-section-card {
  background: var(--ds-gray-50);
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
  padding: var(--ds-space-6);
  margin-bottom: var(--ds-space-6);
}

.ds-section-header {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
  font-size: var(--ds-text-lg);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-800);
  margin-bottom: var(--ds-space-5);
  padding-bottom: var(--ds-space-4);
  border-bottom: 2px solid var(--ds-gray-200);
}

.ds-section-header svg {
  color: var(--ds-gray-500);
}

/* ==========================================================================
   6. BADGE & TAG COMPONENTS
   ========================================================================== */

/* Base Badge */
.ds-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-1);
  font-size: var(--ds-text-xs);
  font-weight: var(--ds-font-semibold);
  padding: 4px 10px;
  border-radius: var(--ds-radius-full);
  white-space: nowrap;
}

/* Badge Sizes */
.ds-badge-sm {
  padding: 2px 8px;
  font-size: 10px;
}

.ds-badge-lg {
  padding: 6px 14px;
  font-size: var(--ds-text-sm);
}

/* Badge Colors - Solid */
.ds-badge-primary {
  background: var(--ds-primary-500);
  color: white;
}

.ds-badge-success {
  background: var(--ds-success-500);
  color: white;
}

.ds-badge-error {
  background: var(--ds-error-500);
  color: white;
}

.ds-badge-warning {
  background: var(--ds-warning-500);
  color: white;
}

.ds-badge-info {
  background: var(--ds-info-500);
  color: white;
}

.ds-badge-gray {
  background: var(--ds-gray-500);
  color: white;
}

/* Badge Colors - Subtle */
.ds-badge-primary-subtle {
  background: var(--ds-primary-100);
  color: var(--ds-primary-700);
}

.ds-badge-success-subtle {
  background: var(--ds-success-100);
  color: var(--ds-success-700);
}

.ds-badge-error-subtle {
  background: var(--ds-error-100);
  color: var(--ds-error-700);
}

.ds-badge-warning-subtle {
  background: var(--ds-warning-100);
  color: var(--ds-warning-700);
}

.ds-badge-info-subtle {
  background: var(--ds-info-100);
  color: var(--ds-info-700);
}

.ds-badge-gray-subtle {
  background: var(--ds-gray-100);
  color: var(--ds-gray-700);
}

/* Badge with Dot */
.ds-badge-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Status Indicator */
.ds-status {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-2);
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-600);
}

.ds-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.ds-status-online .ds-status-dot { background: var(--ds-success-500); }
.ds-status-offline .ds-status-dot { background: var(--ds-gray-400); }
.ds-status-busy .ds-status-dot { background: var(--ds-error-500); }
.ds-status-away .ds-status-dot { background: var(--ds-warning-500); }

/* Tag */
.ds-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-2);
  padding: 4px 10px;
  background: var(--ds-gray-100);
  color: var(--ds-gray-700);
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  border-radius: var(--ds-radius-md);
}

.ds-tag-remove {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--ds-radius-sm);
  cursor: pointer;
  transition: all var(--ds-transition-fast);
}

.ds-tag-remove:hover {
  background: var(--ds-gray-200);
}

/* ==========================================================================
   7. MODAL & DIALOG COMPONENTS
   ========================================================================== */

/* Modal Backdrop */
.ds-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(17, 24, 39, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--ds-z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--ds-space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--ds-transition-base);
}

.ds-modal-backdrop.ds-modal-open {
  opacity: 1;
  visibility: visible;
}

/* Modal Container */
.ds-modal {
  background: white;
  border-radius: var(--ds-radius-xl);
  box-shadow: var(--ds-shadow-2xl);
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(20px);
  transition: all var(--ds-transition-base);
}

.ds-modal-backdrop.ds-modal-open .ds-modal {
  transform: scale(1) translateY(0);
}

/* Modal Sizes */
.ds-modal-sm { width: 100%; max-width: 400px; }
.ds-modal-md { width: 100%; max-width: 560px; }
.ds-modal-lg { width: 100%; max-width: 720px; }
.ds-modal-xl { width: 100%; max-width: 960px; }
.ds-modal-full { width: 100%; max-width: calc(100vw - 64px); max-height: calc(100vh - 64px); }

/* Modal Header */
.ds-modal-header {
  padding: var(--ds-space-5) var(--ds-space-6);
  border-bottom: 1px solid var(--ds-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.ds-modal-title {
  font-size: var(--ds-text-xl);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-900);
  margin: 0;
}

.ds-modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  color: var(--ds-gray-400);
  border-radius: var(--ds-radius-lg);
  cursor: pointer;
  transition: all var(--ds-transition-fast);
}

.ds-modal-close:hover {
  background: var(--ds-gray-100);
  color: var(--ds-gray-600);
}

/* Modal Body */
.ds-modal-body {
  padding: var(--ds-space-6);
  overflow-y: auto;
  flex: 1;
}

/* Modal Footer */
.ds-modal-footer {
  padding: var(--ds-space-4) var(--ds-space-6);
  border-top: 1px solid var(--ds-gray-200);
  background: var(--ds-gray-50);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--ds-space-3);
  flex-shrink: 0;
}

/* Confirmation Modal */
.ds-modal-confirm .ds-modal-body {
  text-align: center;
  padding: var(--ds-space-8) var(--ds-space-6);
}

.ds-modal-confirm-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--ds-space-5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ds-modal-confirm-icon.ds-confirm-danger {
  background: var(--ds-error-100);
  color: var(--ds-error-600);
}

.ds-modal-confirm-icon.ds-confirm-warning {
  background: var(--ds-warning-100);
  color: var(--ds-warning-600);
}

.ds-modal-confirm-icon.ds-confirm-info {
  background: var(--ds-info-100);
  color: var(--ds-info-600);
}

/* ==========================================================================
   8. TABLE COMPONENTS
   ========================================================================== */

/* Table Container */
.ds-table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
}

/* Table */
.ds-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ds-text-sm);
}

/* Table Header */
.ds-table thead {
  background: var(--ds-gray-50);
}

.ds-table th {
  padding: var(--ds-space-3) var(--ds-space-4);
  text-align: left;
  font-size: var(--ds-text-xs);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--ds-gray-200);
  white-space: nowrap;
}

/* Sortable Header */
.ds-table th.ds-sortable {
  cursor: pointer;
  user-select: none;
}

.ds-table th.ds-sortable:hover {
  color: var(--ds-gray-700);
}

.ds-table th .ds-sort-icon {
  margin-left: var(--ds-space-1);
  opacity: 0.5;
}

.ds-table th.ds-sorted .ds-sort-icon {
  opacity: 1;
  color: var(--ds-primary-600);
}

/* Table Body */
.ds-table td {
  padding: var(--ds-space-4);
  color: var(--ds-gray-700);
  border-bottom: 1px solid var(--ds-gray-200);
  vertical-align: middle;
}

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

/* Table Row Hover */
.ds-table tbody tr:hover {
  background: var(--ds-gray-50);
}

/* Table Row Selection */
.ds-table tbody tr.ds-selected {
  background: var(--ds-primary-50);
}

/* Compact Table */
.ds-table-compact th,
.ds-table-compact td {
  padding: var(--ds-space-2) var(--ds-space-3);
}

/* Striped Table */
.ds-table-striped tbody tr:nth-child(even) {
  background: var(--ds-gray-50);
}

/* Table Actions */
.ds-table-actions {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
}

/* Empty Table */
.ds-table-empty {
  text-align: center;
  padding: var(--ds-space-12) var(--ds-space-4);
  color: var(--ds-gray-500);
}

/* ==========================================================================
   9. NAVIGATION COMPONENTS
   ========================================================================== */

/* Breadcrumb */
.ds-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--ds-space-2);
  font-size: var(--ds-text-sm);
}

.ds-breadcrumb-item {
  display: flex;
  align-items: center;
  color: var(--ds-gray-500);
}

.ds-breadcrumb-item a {
  color: var(--ds-gray-500);
  text-decoration: none;
  transition: color var(--ds-transition-fast);
}

.ds-breadcrumb-item a:hover {
  color: var(--ds-primary-600);
}

.ds-breadcrumb-item.ds-active {
  color: var(--ds-gray-900);
  font-weight: var(--ds-font-medium);
}

.ds-breadcrumb-separator {
  color: var(--ds-gray-400);
}

/* Tabs */
.ds-tabs {
  display: flex;
  gap: var(--ds-space-1);
  border-bottom: 1px solid var(--ds-gray-200);
}

.ds-tab {
  padding: var(--ds-space-3) var(--ds-space-4);
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  color: var(--ds-gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--ds-transition-fast);
  margin-bottom: -1px;
}

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

.ds-tab.ds-tab-active {
  color: var(--ds-primary-600);
  border-bottom-color: var(--ds-primary-600);
}

/* Pills Navigation */
.ds-pills {
  display: flex;
  gap: var(--ds-space-2);
  padding: var(--ds-space-1);
  background: var(--ds-gray-100);
  border-radius: var(--ds-radius-lg);
}

.ds-pill {
  padding: var(--ds-space-2) var(--ds-space-4);
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-medium);
  color: var(--ds-gray-600);
  background: none;
  border: none;
  border-radius: var(--ds-radius-md);
  cursor: pointer;
  transition: all var(--ds-transition-fast);
}

.ds-pill:hover {
  color: var(--ds-gray-800);
}

.ds-pill.ds-pill-active {
  background: white;
  color: var(--ds-gray-900);
  box-shadow: var(--ds-shadow-sm);
}

/* Sidebar Navigation */
.ds-nav-sidebar {
  background: white;
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
  padding: var(--ds-space-4);
}

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

.ds-nav-group-label:first-child {
  margin-top: 0;
}

.ds-nav-item {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
  padding: var(--ds-space-3) var(--ds-space-4);
  font-size: var(--ds-text-base);
  color: var(--ds-gray-600);
  text-decoration: none;
  border-radius: var(--ds-radius-lg);
  cursor: pointer;
  transition: all var(--ds-transition-fast);
  margin-bottom: var(--ds-space-1);
}

.ds-nav-item:hover {
  background: var(--ds-gray-100);
  color: var(--ds-gray-900);
}

.ds-nav-item.ds-nav-active {
  background: var(--ds-primary-500);
  color: white;
}

.ds-nav-item.ds-nav-active:hover {
  background: var(--ds-primary-600);
}

/* ==========================================================================
   10. ALERT & NOTIFICATION COMPONENTS
   ========================================================================== */

/* Alert */
.ds-alert {
  display: flex;
  gap: var(--ds-space-3);
  padding: var(--ds-space-4);
  border-radius: var(--ds-radius-lg);
  font-size: var(--ds-text-sm);
}

.ds-alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.ds-alert-content {
  flex: 1;
}

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

.ds-alert-description {
  opacity: 0.9;
}

.ds-alert-close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--ds-transition-fast);
}

.ds-alert-close:hover {
  opacity: 1;
}

/* Alert Variants */
.ds-alert-info {
  background: var(--ds-info-50);
  border: 1px solid var(--ds-info-200);
  color: var(--ds-info-700);
}

.ds-alert-success {
  background: var(--ds-success-50);
  border: 1px solid var(--ds-success-200);
  color: var(--ds-success-700);
}

.ds-alert-warning {
  background: var(--ds-warning-50);
  border: 1px solid var(--ds-warning-200);
  color: var(--ds-warning-700);
}

.ds-alert-error {
  background: var(--ds-error-50);
  border: 1px solid var(--ds-error-200);
  color: var(--ds-error-700);
}

/* Toast */
.ds-toast-container {
  position: fixed;
  top: var(--ds-space-6);
  right: var(--ds-space-6);
  z-index: var(--ds-z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--ds-space-3);
  pointer-events: none;
}

.ds-toast {
  background: white;
  border-radius: var(--ds-radius-xl);
  box-shadow: var(--ds-shadow-lg);
  padding: var(--ds-space-4) var(--ds-space-5);
  min-width: 320px;
  max-width: 420px;
  display: flex;
  align-items: flex-start;
  gap: var(--ds-space-3);
  pointer-events: auto;
  animation: ds-slide-in 0.3s ease-out;
}

.ds-toast-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ds-toast-success .ds-toast-icon {
  background: var(--ds-success-100);
  color: var(--ds-success-600);
}

.ds-toast-error .ds-toast-icon {
  background: var(--ds-error-100);
  color: var(--ds-error-600);
}

.ds-toast-warning .ds-toast-icon {
  background: var(--ds-warning-100);
  color: var(--ds-warning-600);
}

.ds-toast-info .ds-toast-icon {
  background: var(--ds-info-100);
  color: var(--ds-info-600);
}

.ds-toast-content {
  flex: 1;
  min-width: 0;
}

.ds-toast-title {
  font-size: var(--ds-text-sm);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-900);
  margin-bottom: var(--ds-space-1);
}

.ds-toast-message {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
}

.ds-toast-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--ds-gray-400);
  border-radius: var(--ds-radius-md);
  cursor: pointer;
  transition: all var(--ds-transition-fast);
}

.ds-toast-close:hover {
  background: var(--ds-gray-100);
  color: var(--ds-gray-600);
}

/* Banner */
.ds-banner {
  padding: var(--ds-space-3) var(--ds-space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-4);
  font-size: var(--ds-text-sm);
}

.ds-banner-info {
  background: var(--ds-info-500);
  color: white;
}

.ds-banner-warning {
  background: var(--ds-warning-500);
  color: white;
}

.ds-banner-error {
  background: var(--ds-error-500);
  color: white;
}

.ds-banner-success {
  background: var(--ds-success-500);
  color: white;
}

/* ==========================================================================
   11. LOADING & SKELETON STATES
   ========================================================================== */

/* Spinner */
.ds-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--ds-gray-200);
  border-top-color: var(--ds-primary-500);
  border-radius: 50%;
  animation: ds-spin 0.6s linear infinite;
}

.ds-spinner-sm { width: 16px; height: 16px; border-width: 2px; }
.ds-spinner-lg { width: 32px; height: 32px; border-width: 3px; }
.ds-spinner-xl { width: 48px; height: 48px; border-width: 4px; }

/* Loading Overlay */
.ds-loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

/* Skeleton */
.ds-skeleton {
  background: linear-gradient(90deg, var(--ds-gray-200) 25%, var(--ds-gray-100) 50%, var(--ds-gray-200) 75%);
  background-size: 200% 100%;
  animation: ds-shimmer 1.5s infinite;
  border-radius: var(--ds-radius-md);
}

.ds-skeleton-text {
  height: 14px;
  margin-bottom: var(--ds-space-2);
}

.ds-skeleton-text:last-child {
  width: 60%;
}

.ds-skeleton-title {
  height: 24px;
  width: 40%;
  margin-bottom: var(--ds-space-4);
}

.ds-skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.ds-skeleton-button {
  height: 40px;
  width: 120px;
}

.ds-skeleton-card {
  padding: var(--ds-space-5);
  background: white;
  border: 1px solid var(--ds-gray-200);
  border-radius: var(--ds-radius-xl);
}

/* Progress Bar */
.ds-progress {
  height: 8px;
  background: var(--ds-gray-200);
  border-radius: var(--ds-radius-full);
  overflow: hidden;
}

.ds-progress-bar {
  height: 100%;
  background: var(--ds-primary-500);
  border-radius: var(--ds-radius-full);
  transition: width var(--ds-transition-slow);
}

.ds-progress-bar-success { background: var(--ds-success-500); }
.ds-progress-bar-warning { background: var(--ds-warning-500); }
.ds-progress-bar-error { background: var(--ds-error-500); }

/* ==========================================================================
   12. EMPTY STATES
   ========================================================================== */

.ds-empty-state {
  text-align: center;
  padding: var(--ds-space-12) var(--ds-space-6);
}

.ds-empty-state-compact {
  padding: var(--ds-space-8) var(--ds-space-4);
}

.ds-empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--ds-space-5);
  background: var(--ds-gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ds-gray-400);
}

.ds-empty-title {
  font-size: var(--ds-text-lg);
  font-weight: var(--ds-font-semibold);
  color: var(--ds-gray-900);
  margin-bottom: var(--ds-space-2);
}

.ds-empty-description {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  margin-bottom: var(--ds-space-6);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   13. UTILITY CLASSES
   ========================================================================== */

/* Display */
.ds-hidden { display: none !important; }
.ds-block { display: block; }
.ds-inline { display: inline; }
.ds-inline-block { display: inline-block; }
.ds-flex { display: flex; }
.ds-inline-flex { display: inline-flex; }
.ds-grid { display: grid; }

/* Flexbox */
.ds-flex-row { flex-direction: row; }
.ds-flex-col { flex-direction: column; }
.ds-flex-wrap { flex-wrap: wrap; }
.ds-items-start { align-items: flex-start; }
.ds-items-center { align-items: center; }
.ds-items-end { align-items: flex-end; }
.ds-justify-start { justify-content: flex-start; }
.ds-justify-center { justify-content: center; }
.ds-justify-end { justify-content: flex-end; }
.ds-justify-between { justify-content: space-between; }
.ds-flex-1 { flex: 1; }
.ds-flex-shrink-0 { flex-shrink: 0; }

/* Gap */
.ds-gap-1 { gap: var(--ds-space-1); }
.ds-gap-2 { gap: var(--ds-space-2); }
.ds-gap-3 { gap: var(--ds-space-3); }
.ds-gap-4 { gap: var(--ds-space-4); }
.ds-gap-5 { gap: var(--ds-space-5); }
.ds-gap-6 { gap: var(--ds-space-6); }
.ds-gap-8 { gap: var(--ds-space-8); }

/* Margin */
.ds-m-0 { margin: 0; }
.ds-m-auto { margin: auto; }
.ds-mt-1 { margin-top: var(--ds-space-1); }
.ds-mt-2 { margin-top: var(--ds-space-2); }
.ds-mt-3 { margin-top: var(--ds-space-3); }
.ds-mt-4 { margin-top: var(--ds-space-4); }
.ds-mt-5 { margin-top: var(--ds-space-5); }
.ds-mt-6 { margin-top: var(--ds-space-6); }
.ds-mt-8 { margin-top: var(--ds-space-8); }
.ds-mb-1 { margin-bottom: var(--ds-space-1); }
.ds-mb-2 { margin-bottom: var(--ds-space-2); }
.ds-mb-3 { margin-bottom: var(--ds-space-3); }
.ds-mb-4 { margin-bottom: var(--ds-space-4); }
.ds-mb-5 { margin-bottom: var(--ds-space-5); }
.ds-mb-6 { margin-bottom: var(--ds-space-6); }
.ds-mb-8 { margin-bottom: var(--ds-space-8); }
.ds-ml-auto { margin-left: auto; }
.ds-mr-auto { margin-right: auto; }

/* Padding */
.ds-p-0 { padding: 0; }
.ds-p-1 { padding: var(--ds-space-1); }
.ds-p-2 { padding: var(--ds-space-2); }
.ds-p-3 { padding: var(--ds-space-3); }
.ds-p-4 { padding: var(--ds-space-4); }
.ds-p-5 { padding: var(--ds-space-5); }
.ds-p-6 { padding: var(--ds-space-6); }
.ds-p-8 { padding: var(--ds-space-8); }
.ds-px-4 { padding-left: var(--ds-space-4); padding-right: var(--ds-space-4); }
.ds-py-4 { padding-top: var(--ds-space-4); padding-bottom: var(--ds-space-4); }
.ds-px-6 { padding-left: var(--ds-space-6); padding-right: var(--ds-space-6); }
.ds-py-6 { padding-top: var(--ds-space-6); padding-bottom: var(--ds-space-6); }

/* Width */
.ds-w-full { width: 100%; }
.ds-w-auto { width: auto; }
.ds-max-w-sm { max-width: 384px; }
.ds-max-w-md { max-width: 448px; }
.ds-max-w-lg { max-width: 512px; }
.ds-max-w-xl { max-width: 576px; }
.ds-max-w-2xl { max-width: 672px; }

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

/* Font Weight */
.ds-font-normal { font-weight: var(--ds-font-normal); }
.ds-font-medium { font-weight: var(--ds-font-medium); }
.ds-font-semibold { font-weight: var(--ds-font-semibold); }
.ds-font-bold { font-weight: var(--ds-font-bold); }

/* Border Radius */
.ds-rounded-none { border-radius: 0; }
.ds-rounded-sm { border-radius: var(--ds-radius-sm); }
.ds-rounded-md { border-radius: var(--ds-radius-md); }
.ds-rounded-lg { border-radius: var(--ds-radius-lg); }
.ds-rounded-xl { border-radius: var(--ds-radius-xl); }
.ds-rounded-full { border-radius: var(--ds-radius-full); }

/* Borders */
.ds-border { border: 1px solid var(--ds-gray-200); }
.ds-border-t { border-top: 1px solid var(--ds-gray-200); }
.ds-border-b { border-bottom: 1px solid var(--ds-gray-200); }

/* Background */
.ds-bg-white { background: white; }
.ds-bg-gray-50 { background: var(--ds-gray-50); }
.ds-bg-gray-100 { background: var(--ds-gray-100); }
.ds-bg-primary-50 { background: var(--ds-primary-50); }

/* Shadow */
.ds-shadow-none { box-shadow: none; }
.ds-shadow-sm { box-shadow: var(--ds-shadow-sm); }
.ds-shadow-md { box-shadow: var(--ds-shadow-md); }
.ds-shadow-lg { box-shadow: var(--ds-shadow-lg); }

/* Overflow */
.ds-overflow-hidden { overflow: hidden; }
.ds-overflow-auto { overflow: auto; }
.ds-overflow-x-auto { overflow-x: auto; }

/* Position */
.ds-relative { position: relative; }
.ds-absolute { position: absolute; }
.ds-fixed { position: fixed; }
.ds-sticky { position: sticky; }

/* Cursor */
.ds-cursor-pointer { cursor: pointer; }
.ds-cursor-not-allowed { cursor: not-allowed; }

/* Truncate */
.ds-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Divider */
.ds-divider {
  height: 1px;
  background: var(--ds-gray-200);
  margin: var(--ds-space-4) 0;
}

/* ==========================================================================
   14. ANIMATIONS
   ========================================================================== */

@keyframes ds-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes ds-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes ds-slide-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes ds-slide-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

@keyframes ds-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes ds-scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes ds-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* Animation Classes */
.ds-animate-spin { animation: ds-spin 1s linear infinite; }
.ds-animate-pulse { animation: ds-pulse 2s ease-in-out infinite; }
.ds-animate-bounce { animation: ds-bounce 1s ease-in-out infinite; }
.ds-animate-fade-in { animation: ds-fade-in 0.2s ease-out; }
.ds-animate-scale-in { animation: ds-scale-in 0.2s ease-out; }

/* ==========================================================================
   15. ACCESSIBILITY
   ========================================================================== */

/* Focus Visible */
.ds-focus-visible:focus-visible {
  outline: 2px solid var(--ds-primary-500);
  outline-offset: 2px;
}

/* Skip Link */
.ds-skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ds-gray-900);
  color: white;
  padding: var(--ds-space-2) var(--ds-space-4);
  z-index: 100;
  transition: top var(--ds-transition-fast);
}

.ds-skip-link:focus {
  top: 0;
}

/* Screen Reader Only */
.ds-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .ds-btn {
    border: 2px solid currentColor;
  }

  .ds-input {
    border-width: 2px;
  }

  .ds-card {
    border-width: 2px;
  }
}

/* Global Focus Ring */
*:focus-visible {
  outline: 2px solid var(--ds-primary-500);
  outline-offset: 2px;
}

/* Remove focus ring for mouse users */
*:focus:not(:focus-visible) {
  outline: none;
}

/* Interactive elements focus */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--ds-primary-500);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

/* Keyboard navigation indicator */
.keyboard-nav *:focus {
  outline: 2px solid var(--ds-primary-500);
  outline-offset: 2px;
}

/* Focus within for grouped elements */
.focus-within-ring:focus-within {
  outline: 2px solid var(--ds-primary-500);
  outline-offset: 2px;
}

/* Disabled state accessibility */
[disabled],
.disabled,
[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Visually hidden but accessible */
.visually-hidden,
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Show on focus for skip links */
.visually-hidden-focusable:not(:focus):not(:focus-within) {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Live region for announcements */
.live-region {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Touch target sizing (minimum 44x44px) */
.touch-target {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Link visited state for better navigation */
a:visited {
  color: var(--ds-primary-700);
}

/* Error focus styling */
[aria-invalid="true"]:focus-visible,
.input-error:focus-visible {
  outline-color: var(--ds-error-500);
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.2);
}

/* ==========================================================================
   16. RESPONSIVE UTILITIES
   ========================================================================== */

/* Mobile First Responsive */
@media (min-width: 640px) {
  .sm\:ds-hidden { display: none !important; }
  .sm\:ds-block { display: block; }
  .sm\:ds-flex { display: flex; }
  .sm\:ds-grid { display: grid; }
}

@media (min-width: 768px) {
  .md\:ds-hidden { display: none !important; }
  .md\:ds-block { display: block; }
  .md\:ds-flex { display: flex; }
  .md\:ds-grid { display: grid; }
}

@media (min-width: 1024px) {
  .lg\:ds-hidden { display: none !important; }
  .lg\:ds-block { display: block; }
  .lg\:ds-flex { display: flex; }
  .lg\:ds-grid { display: grid; }
}

@media (min-width: 1280px) {
  .xl\:ds-hidden { display: none !important; }
  .xl\:ds-block { display: block; }
  .xl\:ds-flex { display: flex; }
  .xl\:ds-grid { display: grid; }
}

/* Mobile Only */
@media (max-width: 639px) {
  .ds-mobile-hidden { display: none !important; }
  .ds-mobile-stack { flex-direction: column; }
  .ds-mobile-full { width: 100%; }
}

/* ==========================================================================
   17. SHARED SIDEBAR COMPONENT
   ========================================================================== */

/* Sidebar Base */
.sidebar {
  width: 260px;
  background: var(--ds-white, #FFFFFF);
  border-right: 1px solid var(--ds-gray-200);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: transform var(--ds-transition-base);
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--ds-gray-200);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--ds-text-lg);
  font-weight: 700;
  color: var(--ds-gray-900);
}

.sidebar-logo svg {
  flex-shrink: 0;
}

/* Sidebar Menu */
.sidebar-menu {
  flex: 1;
  padding: 16px 0;
  overflow-y: auto;
}

.sidebar-menu-section {
  padding: 16px 24px 8px;
  font-size: var(--ds-text-xs);
  font-weight: 600;
  color: var(--ds-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-menu-item,
.sidebar-menu-item:link,
.sidebar-menu-item:visited {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  color: var(--ds-gray-500);
  text-decoration: none;
  transition: all var(--ds-transition-fast);
  border-left: 3px solid transparent;
  font-size: var(--ds-text-base);
  font-weight: 500;
}

.sidebar-menu-item:hover {
  color: var(--ds-primary-600);
}

.sidebar-menu-item.active {
  background: var(--ds-primary-50);
  color: var(--ds-primary-600);
  border-left-color: var(--ds-primary-600);
  font-weight: 600;
}

.sidebar-menu-item svg {
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-menu-item:hover svg,
.sidebar-menu-item.active svg {
  opacity: 1;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--ds-gray-200);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.sidebar-user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ds-primary-500);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--ds-text-base);
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  font-weight: 600;
  font-size: var(--ds-text-base);
  color: var(--ds-gray-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-email {
  font-size: var(--ds-text-sm);
  color: var(--ds-gray-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-logout-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  color: var(--ds-gray-500);
  cursor: pointer;
  font-size: var(--ds-text-base);
  padding: 8px 0;
  width: 100%;
  text-align: left;
  margin-top: 8px;
  transition: color var(--ds-transition-fast);
}

.sidebar-logout-btn:hover {
  color: var(--ds-error-500);
}

/* Mobile Toggle Button */
.sidebar-mobile-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 1001;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--ds-white, #FFFFFF);
  border: 1px solid var(--ds-gray-200);
  box-shadow: var(--ds-shadow-md);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  color: var(--ds-gray-700);
  transition: all var(--ds-transition-fast);
}

.sidebar-mobile-toggle:hover {
  background: var(--ds-gray-50);
  color: var(--ds-primary-600);
}

/* Sidebar Overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  opacity: 0;
  transition: opacity var(--ds-transition-base);
}

.sidebar-overlay.active {
  opacity: 1;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    z-index: 100;
    box-shadow: var(--ds-shadow-xl);
    background: var(--ds-white, #ffffff);
    overflow-y: auto;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar-mobile-toggle,
  .mobile-nav-toggle {
    display: flex;
  }

  .sidebar-overlay,
  .mobile-nav-overlay {
    display: block;
  }

  .sidebar-overlay.active {
    display: block;
  }
}

/* ==========================================================================
   18. DASHBOARD LAYOUT
   ========================================================================== */

.dashboard-container {
  display: flex;
  min-height: 100vh;
  background: var(--ds-gray-50);
}

.main-content {
  flex: 1;
  overflow-y: auto;
  min-width: 0;
}

.topbar {
  background: var(--ds-white, #FFFFFF);
  border-bottom: 1px solid var(--ds-gray-200);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar h1 {
  font-size: var(--ds-text-2xl);
  font-weight: 700;
  color: var(--ds-gray-900);
  margin: 0;
}

.topbar-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.content-area {
  padding: 32px;
}

@media (max-width: 768px) {
  .topbar {
    padding: 16px;
    padding-left: 72px; /* Space for mobile toggle */
  }

  .topbar h1 {
    font-size: var(--ds-text-lg);
  }

  .content-area {
    padding: 16px;
  }
}

/* ==========================================================================
   19. DARK MODE SUPPORT (Future)
   ========================================================================== */

/* Placeholder for dark mode - uncomment when implementing
@media (prefers-color-scheme: dark) {
  :root {
    --ds-gray-50: #1F2937;
    --ds-gray-100: #374151;
    --ds-gray-200: #4B5563;
    --ds-gray-300: #6B7280;
    --ds-gray-400: #9CA3AF;
    --ds-gray-500: #D1D5DB;
    --ds-gray-600: #E5E7EB;
    --ds-gray-700: #F3F4F6;
    --ds-gray-800: #F9FAFB;
    --ds-gray-900: #FFFFFF;
  }
}
*/