/**
 * World-Class Design System
 * Inspired by Stripe, Linear, and Vercel
 *
 * This design system provides:
 * - Semantic color tokens with dark mode support
 * - Consistent spacing scale
 * - Elevation/shadow system
 * - Animation timing functions
 * - Component-level styles
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */

:root {
  /* === Brand Colors === */
  --color-brand-50: #eff6ff;
  --color-brand-100: #dbeafe;
  --color-brand-200: #bfdbfe;
  --color-brand-300: #93c5fd;
  --color-brand-400: #60a5fa;
  --color-brand-500: #3b82f6;
  --color-brand-600: #2563eb;
  --color-brand-700: #1d4ed8;
  --color-brand-800: #1e40af;
  --color-brand-900: #1e3a8a;

  /* === Neutral Colors (Light Mode) === */
  --color-gray-25: #fcfcfd;
  --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;
  --color-gray-950: #030712;

  /* === Semantic Colors === */
  --color-success-50: #ecfdf5;
  --color-success-100: #d1fae5;
  --color-success-500: #10b981;
  --color-success-600: #059669;
  --color-success-700: #047857;

  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;

  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;

  /* === Surface Colors (Light Mode) === */
  --surface-primary: #ffffff;
  --surface-secondary: var(--color-gray-50);
  --surface-tertiary: var(--color-gray-100);
  --surface-elevated: #ffffff;
  --surface-overlay: rgba(0, 0, 0, 0.5);

  /* === Text Colors (Light Mode) === */
  --text-primary: var(--color-gray-900);
  --text-secondary: var(--color-gray-600);
  --text-tertiary: var(--color-gray-500);
  --text-placeholder: var(--color-gray-400);
  --text-inverse: #ffffff;
  --text-brand: var(--color-brand-600);
  --text-success: var(--color-success-700);
  --text-warning: var(--color-warning-700);
  --text-error: var(--color-error-600);

  /* === Border Colors (Light Mode) === */
  --border-primary: var(--color-gray-200);
  --border-secondary: var(--color-gray-300);
  --border-focus: var(--color-brand-500);
  --border-error: var(--color-error-500);
  --border-success: var(--color-success-500);

  /* === Spacing Scale (4px base) === */
  --space-0: 0;
  --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 */
  --space-24: 6rem;    /* 96px */

  /* === 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-3xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;

  /* === Shadow/Elevation System === */
  --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-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

  /* Focus ring shadow (for accessibility) */
  --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.5);
  --shadow-focus-error: 0 0 0 3px rgba(239, 68, 68, 0.5);
  --shadow-focus-success: 0 0 0 3px rgba(16, 185, 129, 0.5);

  /* === Typography === */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, 'DejaVu Sans Mono', Menlo, Consolas, monospace;

  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* === Animation/Transition === */
  --duration-instant: 0ms;
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --duration-slower: 500ms;

  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* === 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;
  --z-toast: 1080;
}

/* === Dark Mode Overrides === */
.dark {
  --surface-primary: var(--color-gray-900);
  --surface-secondary: var(--color-gray-800);
  --surface-tertiary: var(--color-gray-700);
  --surface-elevated: var(--color-gray-800);
  --surface-overlay: rgba(0, 0, 0, 0.75);

  --text-primary: var(--color-gray-50);
  --text-secondary: var(--color-gray-300);
  --text-tertiary: var(--color-gray-400);
  --text-placeholder: var(--color-gray-500);

  --border-primary: var(--color-gray-700);
  --border-secondary: var(--color-gray-600);

  /* Adjusted shadows for dark mode */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
}


/* ========================================
   Base Styles
   ======================================== */

* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background-color: var(--surface-secondary);
  color: var(--text-primary);
  line-height: var(--leading-normal);
  transition: background-color var(--duration-normal) var(--ease-default),
              color var(--duration-normal) var(--ease-default);
}

/* === Selection === */
::selection {
  background-color: var(--color-brand-100);
  color: var(--color-brand-900);
}

.dark ::selection {
  background-color: var(--color-brand-800);
  color: var(--color-brand-100);
}


/* ========================================
   Button Components
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 500;
  font-size: var(--text-sm);
  line-height: 1;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease-default);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

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

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

/* Primary Button */
.btn-primary {
  background: linear-gradient(180deg, var(--color-brand-500) 0%, var(--color-brand-600) 100%);
  color: white;
  border-color: var(--color-brand-600);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
  background: linear-gradient(180deg, var(--color-brand-600) 0%, var(--color-brand-700) 100%);
  border-color: var(--color-brand-700);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--color-brand-700);
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

/* Secondary Button */
.btn-secondary {
  background: var(--surface-primary);
  color: var(--text-primary);
  border-color: var(--border-secondary);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: var(--surface-tertiary);
  border-color: var(--border-secondary);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:active {
  background: var(--surface-tertiary);
  box-shadow: var(--shadow-inner);
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--surface-tertiary);
  color: var(--text-primary);
}

/* Danger Button */
.btn-danger {
  background: linear-gradient(180deg, var(--color-error-500) 0%, var(--color-error-600) 100%);
  color: white;
  border-color: var(--color-error-600);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-danger:hover {
  background: linear-gradient(180deg, var(--color-error-600) 0%, var(--color-error-700) 100%);
  border-color: var(--color-error-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-danger:active {
  background: var(--color-error-700);
  transform: translateY(0);
}

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

/* Success Button */
.btn-success {
  background: linear-gradient(180deg, var(--color-success-500) 0%, var(--color-success-600) 100%);
  color: white;
  border-color: var(--color-success-600);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-success:hover {
  background: linear-gradient(180deg, var(--color-success-600) 0%, var(--color-success-700) 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* Button Sizes */
.btn-xs {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
}

.btn-sm {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3);
}

.btn-lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-6);
}

.btn-xl {
  font-size: var(--text-lg);
  padding: var(--space-5) var(--space-8);
  border-radius: var(--radius-xl);
}

/* Icon-only Button */
.btn-icon {
  padding: var(--space-2);
  aspect-ratio: 1;
}

.btn-icon.btn-sm {
  padding: var(--space-1);
}

.btn-icon.btn-lg {
  padding: var(--space-3);
}

/* Loading State */
.btn-loading {
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
}

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

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}


/* ========================================
   Form Components
   ======================================== */

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

/* Labels */
.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

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

/* Text Inputs */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--surface-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: all var(--duration-fast) var(--ease-default);
  appearance: none;
}

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

.form-input:hover {
  border-color: var(--border-secondary);
}

.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
}

.form-input:disabled {
  background-color: var(--surface-tertiary);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

/* Input States */
.form-input-error {
  border-color: var(--border-error);
}

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

.form-input-success {
  border-color: var(--border-success);
}

.form-input-success:focus {
  border-color: var(--border-success);
  box-shadow: var(--shadow-focus-success);
}

/* Helper Text */
.form-helper {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.form-error {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-error);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

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

.form-input-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-placeholder);
  pointer-events: none;
  transition: color var(--duration-fast) var(--ease-default);
}

.form-input-wrapper .form-input {
  padding-left: calc(var(--space-4) + 1.25rem + var(--space-2));
}

.form-input-wrapper:focus-within .form-input-icon {
  color: var(--color-brand-500);
}

/* Input with Right Icon/Button */
.form-input-action {
  position: absolute;
  right: var(--space-1);
  top: 50%;
  transform: translateY(-50%);
}

.form-input-wrapper.has-action .form-input {
  padding-right: calc(var(--space-4) + 2rem);
}

/* Textarea */
.form-textarea {
  min-height: 120px;
  resize: vertical;
  line-height: var(--leading-relaxed);
}

/* Select */
.form-select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right var(--space-3) center;
  background-repeat: no-repeat;
  background-size: 1.25rem;
  padding-right: calc(var(--space-4) + 1.5rem);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.form-check-input {
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.125rem;
  cursor: pointer;
  border: 1.5px solid var(--border-secondary);
  border-radius: var(--radius-sm);
  background-color: var(--surface-primary);
  transition: all var(--duration-fast) var(--ease-default);
  appearance: none;
  flex-shrink: 0;
}

.form-check-input:hover {
  border-color: var(--color-brand-500);
}

.form-check-input:focus {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.form-check-input:checked {
  background-color: var(--color-brand-600);
  border-color: var(--color-brand-600);
  background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3e%3c/svg%3e");
  background-size: 100% 100%;
  background-position: center;
  background-repeat: no-repeat;
}

.form-check-input[type="radio"] {
  border-radius: 50%;
}

.form-check-input[type="radio"]:checked {
  background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3ccircle cx='8' cy='8' r='3'/%3e%3c/svg%3e");
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  line-height: var(--leading-normal);
}

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

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

.form-switch-slider {
  position: relative;
  width: 44px;
  height: 24px;
  background-color: var(--color-gray-300);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-default);
}

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

.form-switch-input:checked + .form-switch-slider {
  background-color: var(--color-brand-600);
}

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

.form-switch-input:focus + .form-switch-slider {
  box-shadow: var(--shadow-focus);
}

.dark .form-switch-slider {
  background-color: var(--color-gray-600);
}

/* Character Counter */
.form-char-count {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.form-char-count.is-warning {
  color: var(--color-warning-600);
}

.form-char-count.is-error {
  color: var(--text-error);
}


/* ========================================
   Card Components
   ======================================== */

.card {
  background-color: var(--surface-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-normal) var(--ease-default);
}

.card-elevated {
  box-shadow: var(--shadow-md);
}

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

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  border-color: var(--border-secondary);
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-primary);
}

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

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-primary);
  background-color: var(--surface-secondary);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* Stat Card */
.stat-card {
  padding: var(--space-6);
}

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

.stat-card-icon.brand {
  background-color: var(--color-brand-100);
  color: var(--color-brand-600);
}

.dark .stat-card-icon.brand {
  background-color: var(--color-brand-900);
  color: var(--color-brand-400);
}

.stat-card-icon.success {
  background-color: var(--color-success-100);
  color: var(--color-success-600);
}

.dark .stat-card-icon.success {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--color-success-500);
}

.stat-card-icon.warning {
  background-color: var(--color-warning-100);
  color: var(--color-warning-600);
}

.dark .stat-card-icon.warning {
  background-color: rgba(245, 158, 11, 0.2);
  color: var(--color-warning-500);
}

.stat-card-icon.error {
  background-color: var(--color-error-100);
  color: var(--color-error-600);
}

.dark .stat-card-icon.error {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--color-error-500);
}

.stat-card-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  margin-bottom: var(--space-1);
}

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

.stat-card-trend {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  margin-top: var(--space-2);
}

.stat-card-trend.up {
  color: var(--color-success-600);
}

.stat-card-trend.down {
  color: var(--color-error-600);
}


/* ========================================
   Badge Components
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-md);
  line-height: 1;
  white-space: nowrap;
}

.badge-pill {
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
}

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

.dark .badge-success {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--color-success-500);
}

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

.dark .badge-warning {
  background-color: rgba(245, 158, 11, 0.2);
  color: var(--color-warning-500);
}

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

.dark .badge-error {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--color-error-500);
}

.badge-info {
  background-color: var(--color-info-100);
  color: var(--color-info-600);
}

.dark .badge-info {
  background-color: rgba(59, 130, 246, 0.2);
  color: var(--color-brand-400);
}

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

.dark .badge-neutral {
  background-color: var(--color-gray-700);
  color: var(--color-gray-300);
}

/* Dot indicator for badges */
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

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

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

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


/* ========================================
   Table Components
   ======================================== */

.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  background-color: var(--surface-primary);
}

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

.table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  background-color: var(--surface-secondary);
  border-bottom: 1px solid var(--border-primary);
  white-space: nowrap;
}

.table th:first-child {
  border-top-left-radius: var(--radius-xl);
}

.table th:last-child {
  border-top-right-radius: var(--radius-xl);
}

.table td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
  color: var(--text-primary);
  vertical-align: middle;
}

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

.table tbody tr:hover {
  background-color: var(--surface-secondary);
}

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

.table tbody tr:last-child td:first-child {
  border-bottom-left-radius: var(--radius-xl);
}

.table tbody tr:last-child td:last-child {
  border-bottom-right-radius: var(--radius-xl);
}

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

.table th.sortable:hover {
  background-color: var(--surface-tertiary);
}

.table th .sort-icon {
  opacity: 0.3;
  margin-left: var(--space-1);
  transition: opacity var(--duration-fast) var(--ease-default);
}

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

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


/* ========================================
   Modal Components
   ======================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: var(--surface-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-default),
              visibility var(--duration-normal) var(--ease-default);
}

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

.modal {
  background-color: var(--surface-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 500px;
  max-height: calc(100vh - var(--space-8));
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(10px);
  opacity: 0;
  transition: transform var(--duration-normal) var(--ease-spring),
              opacity var(--duration-normal) var(--ease-default);
}

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

.modal-sm { max-width: 400px; }
.modal-lg { max-width: 640px; }
.modal-xl { max-width: 800px; }
.modal-full { max-width: calc(100vw - var(--space-8)); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-primary);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-default);
}

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

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-primary);
  background-color: var(--surface-secondary);
  border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
}


/* ========================================
   Toast/Notification Components
   ======================================== */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-3);
  pointer-events: none;
}

/* Mobile positioning */
@media (max-width: 640px) {
  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
  }
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background-color: var(--surface-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  min-width: 320px;
  max-width: 420px;
  pointer-events: auto;
  transform: translateX(calc(100% + var(--space-6)));
  opacity: 0;
  transition: transform var(--duration-slow) var(--ease-spring),
              opacity var(--duration-normal) var(--ease-default);
}

@media (max-width: 640px) {
  .toast {
    min-width: auto;
    max-width: none;
    transform: translateY(100%);
  }
}

.toast.is-visible {
  transform: translateX(0);
  opacity: 1;
}

@media (max-width: 640px) {
  .toast.is-visible {
    transform: translateY(0);
  }
}

.toast.is-leaving {
  transform: translateX(calc(100% + var(--space-6)));
  opacity: 0;
}

@media (max-width: 640px) {
  .toast.is-leaving {
    transform: translateY(100%);
  }
}

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

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

.toast-title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.toast-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-default);
}

.toast-close:hover {
  background-color: var(--surface-tertiary);
  color: var(--text-primary);
}

/* Toast variants */
.toast-success .toast-icon { color: var(--color-success-500); }
.toast-error .toast-icon { color: var(--color-error-500); }
.toast-warning .toast-icon { color: var(--color-warning-500); }
.toast-info .toast-icon { color: var(--color-brand-500); }

/* Toast progress bar */
.toast-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background-color: var(--color-brand-500);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  animation: toast-progress linear forwards;
}

.toast-success .toast-progress { background-color: var(--color-success-500); }
.toast-error .toast-progress { background-color: var(--color-error-500); }
.toast-warning .toast-progress { background-color: var(--color-warning-500); }

@keyframes toast-progress {
  from { width: 100%; }
  to { width: 0%; }
}


/* ========================================
   Loading Components
   ======================================== */

/* Spinner */
.spinner {
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}

.spinner-sm {
  width: 0.875rem;
  height: 0.875rem;
  border-width: 1.5px;
}

.spinner-lg {
  width: 1.5rem;
  height: 1.5rem;
  border-width: 2.5px;
}

.spinner-xl {
  width: 2rem;
  height: 2rem;
  border-width: 3px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

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

.dark .skeleton {
  background: linear-gradient(
    90deg,
    var(--color-gray-700) 25%,
    var(--color-gray-600) 50%,
    var(--color-gray-700) 75%
  );
  background-size: 200% 100%;
}

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

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

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

.skeleton-circle {
  border-radius: 50%;
}

.skeleton-card {
  height: 120px;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  border-radius: inherit;
}

.dark .loading-overlay {
  background-color: rgba(17, 24, 39, 0.8);
}


/* ========================================
   Navigation Components
   ======================================== */

.navbar {
  background-color: var(--surface-primary);
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(8px);
  background-color: rgba(255, 255, 255, 0.9);
}

.dark .navbar {
  background-color: rgba(17, 24, 39, 0.9);
}

.navbar-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.navbar-logo {
  height: 32px;
  width: auto;
}

.navbar-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-brand-600);
  letter-spacing: var(--tracking-tight);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.navbar-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-default);
}

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

.navbar-link.active {
  background-color: var(--color-brand-50);
  color: var(--color-brand-700);
}

.dark .navbar-link.active {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--color-brand-400);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile Menu Toggle */
.navbar-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-default);
}

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

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
}

.mobile-menu.is-open {
  display: block;
}

.mobile-menu-backdrop {
  position: absolute;
  inset: 0;
  background-color: var(--surface-overlay);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-default);
}

.mobile-menu.is-open .mobile-menu-backdrop {
  opacity: 1;
}

.mobile-menu-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 320px;
  background-color: var(--surface-primary);
  box-shadow: var(--shadow-2xl);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-spring);
  display: flex;
  flex-direction: column;
}

.mobile-menu.is-open .mobile-menu-panel {
  transform: translateX(0);
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
}

.mobile-menu-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.mobile-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-default);
  margin-bottom: var(--space-1);
}

.mobile-menu-link:hover {
  background-color: var(--surface-tertiary);
  color: var(--text-primary);
}

.mobile-menu-link.active {
  background-color: var(--color-brand-50);
  color: var(--color-brand-700);
}

.dark .mobile-menu-link.active {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--color-brand-400);
}

.mobile-menu-link i {
  width: 20px;
  text-align: center;
}

.mobile-menu-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border-primary);
}

@media (max-width: 768px) {
  .navbar-menu {
    display: none;
  }

  .navbar-toggle {
    display: flex;
  }
}


/* ========================================
   Empty States
   ======================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--surface-tertiary);
  color: var(--text-tertiary);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 360px;
  margin-bottom: var(--space-6);
}


/* ========================================
   Utility Classes
   ======================================== */

/* Text utilities */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-brand { color: var(--text-brand); }
.text-success { color: var(--text-success); }
.text-warning { color: var(--text-warning); }
.text-error { color: var(--text-error); }

/* Background utilities */
.bg-primary { background-color: var(--surface-primary); }
.bg-secondary { background-color: var(--surface-secondary); }
.bg-tertiary { background-color: var(--surface-tertiary); }

/* Border utilities */
.border-primary { border-color: var(--border-primary); }
.border-secondary { border-color: var(--border-secondary); }

/* Animation utilities */
.animate-fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-default);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-slide-up {
  animation: slideUp var(--duration-normal) var(--ease-out);
}

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

.animate-slide-down {
  animation: slideDown var(--duration-normal) var(--ease-out);
}

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

.animate-scale-in {
  animation: scaleIn var(--duration-normal) var(--ease-spring);
}

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

/* Focus visible for keyboard navigation */
.focus-ring:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Transition utilities */
.transition-colors {
  transition: color var(--duration-fast) var(--ease-default),
              background-color var(--duration-fast) var(--ease-default),
              border-color var(--duration-fast) var(--ease-default);
}

.transition-transform {
  transition: transform var(--duration-fast) var(--ease-default);
}

.transition-all {
  transition: all var(--duration-fast) var(--ease-default);
}

/* Hover lift effect */
.hover-lift {
  transition: transform var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
}

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

/* Screen reader only */
.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;
}


/* ========================================
   Responsive Utilities
   ======================================== */

/* Hide on mobile */
@media (max-width: 640px) {
  .hide-mobile { display: none !important; }
}

/* Hide on tablet */
@media (min-width: 641px) and (max-width: 1024px) {
  .hide-tablet { display: none !important; }
}

/* Hide on desktop */
@media (min-width: 1025px) {
  .hide-desktop { display: none !important; }
}

/* Show only on mobile */
@media (min-width: 641px) {
  .show-mobile-only { display: none !important; }
}

/* Touch-friendly tap targets on mobile */
@media (max-width: 640px) {
  .touch-target {
    min-height: 44px;
    min-width: 44px;
  }
}


/* ========================================
   Page-Specific Enhancements
   ======================================== */

/* Auth pages (login, register) */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: linear-gradient(135deg, var(--surface-secondary) 0%, var(--surface-primary) 100%);
}

.dark .auth-container {
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-gray-950) 100%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.auth-logo {
  height: 48px;
  margin-bottom: var(--space-4);
}

.auth-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

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

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

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

.auth-footer {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.auth-footer a {
  color: var(--text-brand);
  font-weight: 500;
  text-decoration: none;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* Activity Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--border-primary), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-6);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-8) + 8px);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--surface-primary);
  border: 2px solid var(--border-secondary);
  z-index: 1;
}

.timeline-item.is-active .timeline-marker {
  background-color: var(--color-brand-500);
  border-color: var(--color-brand-500);
}

.timeline-content {
  background-color: var(--surface-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.timeline-time {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

.timeline-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.timeline-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}


/* ========================================
   Print Styles
   ======================================== */

@media print {
  .navbar,
  .mobile-menu,
  .toast-container,
  .btn {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .card {
    box-shadow: none !important;
    border: 1px solid #ddd !important;
  }
}