/* ====================================
   KnowFlex Design System v3.0
   Modern, Accessible, Stunning
   ==================================== */

/* ====================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ==================================== */

:root {
  /* === Colors === */
  /* Primary Brand Colors - Orange */
  --color-primary-50: #fff7ed;
  --color-primary-100: #ffedd5;
  --color-primary-200: #fed7aa;
  --color-primary-300: #fdba74;
  --color-primary-400: #fb923c;
  --color-primary-500: #F26622; /* Main brand color */
  --color-primary-600: #ea580c;
  --color-primary-700: #c2410c;
  --color-primary-800: #9a3412;
  --color-primary-900: #7c2d12;

  /* Secondary Colors - Indigo */
  --color-secondary-50: #eef2ff;
  --color-secondary-100: #e0e7ff;
  --color-secondary-200: #c7d2fe;
  --color-secondary-300: #a5b4fc;
  --color-secondary-400: #818cf8;
  --color-secondary-500: #6366f1;
  --color-secondary-600: #4f46e5;
  --color-secondary-700: #4338ca;
  --color-secondary-800: #3730a3;
  --color-secondary-900: #312e81;

  /* Neutrals */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;

  /* Semantic Colors - ADA Compliant Contrast Ratios */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #16a34a;
  --color-success-600: #15803d;
  --color-success-700: #166534;

  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #dc2626;
  --color-error-600: #b91c1c;
  --color-error-700: #991b1b;

  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #d97706;
  --color-warning-600: #b45309;
  --color-warning-700: #92400e;

  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #2563eb;
  --color-info-600: #1d4ed8;
  --color-info-700: #1e40af;

  /* === Typography === */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-display: 'Space Grotesk', 'Inter', -apple-system, sans-serif;
  --font-family-mono: 'JetBrains Mono', Menlo, Monaco, 'Courier New', monospace;

  /* Font Sizes - Fluid */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* === Spacing === */
  --space-px: 1px;
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* === Border Radius === */
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* === Shadows - Softer, more modern === */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.06);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow-primary: 0 0 20px rgba(242, 102, 34, 0.15), 0 0 60px rgba(242, 102, 34, 0.05);
  --shadow-glow-secondary: 0 0 20px rgba(99, 102, 241, 0.15), 0 0 60px rgba(99, 102, 241, 0.05);

  /* === Transitions === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

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

  /* === Layout === */
  --container-max-width: 1280px;
  --container-padding: var(--space-4);
  --grid-gap: var(--space-6);

  /* === Focus Ring - ADA === */
  --focus-ring-color: var(--color-primary-500);
  --focus-ring-offset: 2px;
  --focus-ring-width: 3px;
}

/* ====================================
   ACCESSIBILITY FOUNDATIONS
   ==================================== */

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary-600);
  color: var(--color-neutral-0);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: var(--focus-ring-width) solid var(--color-neutral-0);
  outline-offset: var(--focus-ring-offset);
}

/* Focus Visible - Only show focus ring for keyboard navigation */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

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

/* 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-width: 0;
}

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* High Contrast Mode */
@media (forced-colors: active) {
  .btn {
    border: 2px solid ButtonText;
  }
  .card {
    border: 2px solid CanvasText;
  }
  .form-input {
    border: 2px solid CanvasText;
  }
  .badge {
    border: 1px solid CanvasText;
  }
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-neutral-800);
  background-color: var(--color-neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

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

img[loading="lazy"] {
  content-visibility: auto;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

a {
  color: var(--color-primary-600);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

/* Ensure links are distinguishable - ADA */
a:not(.btn):not(.nav-link):not(.nav-brand):not([class*="career"]):not([class*="speaker"]):not([class*="talk"]):not([class*="btn"]):not([class*="card"]) {
  text-decoration: underline;
}

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

/* ====================================
   LAYOUT COMPONENTS
   ==================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.grid-auto-fit { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-auto-fill { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.inline-flex { display: inline-flex; }

.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

.overflow-hidden { overflow: hidden; }

.max-w-7xl { max-width: 80rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ====================================
   TYPOGRAPHY
   ==================================== */

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }
.text-6xl { font-size: var(--font-size-6xl); }

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

.leading-tight { line-height: var(--line-height-tight); }
.leading-snug { line-height: var(--line-height-snug); }
.leading-normal { line-height: var(--line-height-normal); }
.leading-relaxed { line-height: var(--line-height-relaxed); }
.leading-loose { line-height: var(--line-height-loose); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.uppercase { text-transform: uppercase; }
.capitalize { text-transform: capitalize; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Text Colors */
.text-primary { color: var(--color-primary-600); }
.text-primary-500 { color: var(--color-primary-500); }
.text-primary-600 { color: var(--color-primary-600); }
.text-primary-700 { color: var(--color-primary-700); }

.text-neutral-400 { color: var(--color-neutral-400); }
.text-neutral-500 { color: var(--color-neutral-500); }
.text-neutral-600 { color: var(--color-neutral-600); }
.text-neutral-700 { color: var(--color-neutral-700); }
.text-neutral-800 { color: var(--color-neutral-800); }
.text-neutral-900 { color: var(--color-neutral-900); }
.text-white { color: var(--color-neutral-0); }

.text-success { color: var(--color-success-600); }
.text-error { color: var(--color-error-600); }
.text-warning { color: var(--color-warning-600); }
.text-info { color: var(--color-info-600); }

/* ====================================
   SPACING UTILITIES
   ==================================== */

/* Margin */
.m-0 { margin: var(--space-0); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }
.m-auto { margin: auto; }

.mt-0 { margin-top: var(--space-0); }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }

.mb-0 { margin-bottom: var(--space-0); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

.ml-0 { margin-left: var(--space-0); }
.ml-1 { margin-left: var(--space-1); }
.ml-2 { margin-left: var(--space-2); }
.ml-3 { margin-left: var(--space-3); }
.ml-4 { margin-left: var(--space-4); }
.ml-auto { margin-left: auto; }

.mr-0 { margin-right: var(--space-0); }
.mr-1 { margin-right: var(--space-1); }
.mr-2 { margin-right: var(--space-2); }
.mr-3 { margin-right: var(--space-3); }
.mr-4 { margin-right: var(--space-4); }
.mr-auto { margin-right: auto; }

/* Padding */
.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }

.pt-0 { padding-top: var(--space-0); }
.pt-1 { padding-top: var(--space-1); }
.pt-2 { padding-top: var(--space-2); }
.pt-3 { padding-top: var(--space-3); }
.pt-4 { padding-top: var(--space-4); }
.pt-5 { padding-top: var(--space-5); }
.pt-6 { padding-top: var(--space-6); }
.pt-8 { padding-top: var(--space-8); }
.pt-10 { padding-top: var(--space-10); }
.pt-12 { padding-top: var(--space-12); }

.pb-0 { padding-bottom: var(--space-0); }
.pb-1 { padding-bottom: var(--space-1); }
.pb-2 { padding-bottom: var(--space-2); }
.pb-3 { padding-bottom: var(--space-3); }
.pb-4 { padding-bottom: var(--space-4); }
.pb-5 { padding-bottom: var(--space-5); }
.pb-6 { padding-bottom: var(--space-6); }
.pb-8 { padding-bottom: var(--space-8); }

.pl-0 { padding-left: var(--space-0); }
.pl-1 { padding-left: var(--space-1); }
.pl-2 { padding-left: var(--space-2); }
.pl-3 { padding-left: var(--space-3); }
.pl-4 { padding-left: var(--space-4); }
.pl-5 { padding-left: var(--space-5); }
.pl-6 { padding-left: var(--space-6); }

.pr-0 { padding-right: var(--space-0); }
.pr-1 { padding-right: var(--space-1); }
.pr-2 { padding-right: var(--space-2); }
.pr-3 { padding-right: var(--space-3); }
.pr-4 { padding-right: var(--space-4); }
.pr-5 { padding-right: var(--space-5); }
.pr-6 { padding-right: var(--space-6); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }

/* ====================================
   COMPONENT LIBRARY
   ==================================== */

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-xl);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  min-height: 44px; /* ADA touch target */
  line-height: var(--line-height-tight);
  letter-spacing: 0.01em;
}

.btn:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
  color: var(--color-neutral-0);
  border-color: var(--color-primary-600);
  box-shadow: var(--shadow-sm), 0 2px 8px rgba(242, 102, 34, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  box-shadow: var(--shadow-md), 0 4px 16px rgba(242, 102, 34, 0.3);
  transform: translateY(-1px);
  color: var(--color-neutral-0);
  text-decoration: none;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: var(--color-neutral-0);
  color: var(--color-neutral-700);
  border-color: var(--color-neutral-300);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: var(--color-neutral-50);
  border-color: var(--color-neutral-400);
  transform: translateY(-1px);
  color: var(--color-neutral-800);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-300);
}

.btn-outline:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary-500);
  color: var(--color-primary-700);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--color-neutral-600);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
  text-decoration: none;
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-error-500), var(--color-error-600));
  color: var(--color-neutral-0);
  border-color: var(--color-error-600);
}

.btn-danger:hover {
  background: linear-gradient(135deg, var(--color-error-600), var(--color-error-700));
  transform: translateY(-1px);
  color: var(--color-neutral-0);
  text-decoration: none;
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600));
  color: var(--color-neutral-0);
  border-color: var(--color-success-600);
}

.btn-success:hover {
  background: linear-gradient(135deg, var(--color-success-600), var(--color-success-700));
  transform: translateY(-1px);
  color: var(--color-neutral-0);
  text-decoration: none;
}

/* Button Sizes */
.btn-xs { padding: var(--space-1) var(--space-3); font-size: var(--font-size-xs); min-height: 32px; }
.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--font-size-sm); min-height: 36px; }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--font-size-lg); min-height: 52px; border-radius: var(--radius-2xl); }
.btn-xl { padding: var(--space-5) var(--space-10); font-size: var(--font-size-xl); min-height: 60px; border-radius: var(--radius-2xl); }

.btn-icon { padding: var(--space-3); min-width: 44px; min-height: 44px; }

/* === Cards === */
.card {
  background: var(--color-neutral-0);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
}

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

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-neutral-100);
}

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

.card-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-neutral-100);
  background: var(--color-neutral-50);
}

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

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

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-200);
}

/* Glass Card */
.card-glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

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

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

/* Required field indicator */
.form-label[aria-required="true"]::after,
.form-label .required::after {
  content: " *";
  color: var(--color-error-500);
}

.form-input {
  width: 100%;
  padding: 0.625rem var(--space-4);
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 2px solid var(--color-neutral-300);
  border-radius: var(--radius-xl);
  background: var(--color-neutral-0);
  transition: all var(--transition-fast);
  outline: none;
  min-height: 44px; /* ADA touch target */
  color: var(--color-neutral-800);
}

.form-input::placeholder {
  color: var(--color-neutral-400);
}

.form-input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 4px rgba(242, 102, 34, 0.1);
}

.form-input:focus-visible {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 4px rgba(242, 102, 34, 0.15);
}

.form-input[aria-invalid="true"],
.form-input:user-invalid {
  border-color: var(--color-error-500);
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1);
}

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

.form-select {
  appearance: none;
  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 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.25em 1.25em;
  padding-right: 2.5rem;
}

.form-help {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-neutral-500);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-error-600);
  font-weight: var(--font-weight-medium);
}

/* === Badges === */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.175rem var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.badge-primary { background: var(--color-primary-100); color: var(--color-primary-800); }
.badge-secondary { background: var(--color-secondary-100); color: var(--color-secondary-800); }
.badge-success { background: var(--color-success-100); color: var(--color-success-700); }
.badge-error { background: var(--color-error-100); color: var(--color-error-700); }
.badge-warning { background: var(--color-warning-100); color: var(--color-warning-700); }
.badge-info { background: var(--color-info-100); color: var(--color-info-700); }

/* === Navigation === */
.nav {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
  transition: all var(--transition-base);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  min-height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-900);
  text-decoration: none;
  font-family: var(--font-family-display);
}

.nav-brand:hover {
  color: var(--color-primary-600);
  text-decoration: none;
}

.nav-brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(242, 102, 34, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-600);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
  text-decoration: none;
}

.nav-link[aria-current="page"],
.nav-link.active {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
  font-weight: var(--font-weight-semibold);
}

/* === Alerts === */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-xl);
  border-left: 4px solid;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.alert-success {
  background: var(--color-success-50);
  border-color: var(--color-success-500);
  color: var(--color-success-700);
}

.alert-error, .alert-danger {
  background: var(--color-error-50);
  border-color: var(--color-error-500);
  color: var(--color-error-700);
}

.alert-warning {
  background: var(--color-warning-50);
  border-color: var(--color-warning-500);
  color: var(--color-warning-700);
}

.alert-info {
  background: var(--color-info-50);
  border-color: var(--color-info-500);
  color: var(--color-info-700);
}

/* === Hero Section === */
.hero {
  background: linear-gradient(135deg, var(--color-secondary-600), var(--color-secondary-800));
  color: var(--color-neutral-0);
  padding: var(--space-20) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.1), transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-family-display);
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  line-height: var(--line-height-relaxed);
  opacity: 0.9;
  margin-bottom: var(--space-8);
}

/* === Section Headers === */
.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-neutral-100);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-800);
}

.section-header i {
  color: var(--color-primary-500);
  font-size: var(--font-size-xl);
}

/* === Tables === */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-neutral-200);
}

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

th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-neutral-50);
  border-bottom: 2px solid var(--color-neutral-200);
}

td {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  border-bottom: 1px solid var(--color-neutral-100);
  color: var(--color-neutral-700);
}

tr:hover td {
  background: var(--color-neutral-50);
}

/* === Modal/Dialog === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-index-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal {
  background: var(--color-neutral-0);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  max-width: 32rem;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: var(--z-index-modal);
}

.modal[role="dialog"] {
  animation: modalIn 0.3s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* === Progress Bar === */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-400));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* === Empty States === */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--color-neutral-400);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  color: var(--color-neutral-300);
}

.empty-state h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-neutral-600);
  margin-bottom: var(--space-2);
}

.empty-state p {
  color: var(--color-neutral-500);
  max-width: 400px;
  margin: 0 auto;
}

/* === Loading States === */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-neutral-200);
  border-top: 4px solid var(--color-primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(90deg, var(--color-neutral-200) 25%, var(--color-neutral-100) 50%, var(--color-neutral-200) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-lg);
}

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

/* === Animations === */
.fade-in {
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide-in-left {
  animation: slideInLeft 0.4s ease-out;
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-24px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-in-right {
  animation: slideInRight 0.4s ease-out;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(24px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-up {
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.scale-in {
  animation: scaleIn 0.3s ease-out;
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

/* === Additional Utilities === */
.w-full { width: 100%; }
.w-16 { width: 4rem; }
.h-16 { height: 4rem; }
.w-80 { width: 20rem; }

.rounded-full { border-radius: var(--radius-full); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }

.object-cover { object-fit: cover; }

.border { border: 1px solid var(--color-neutral-200); }
.border-2 { border-width: 2px; }
.border-primary-200 { border-color: var(--color-primary-200); }

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

.bg-white { background: var(--color-neutral-0); }
.bg-neutral-50 { background: var(--color-neutral-50); }

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

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

/* === Responsive Design === */

@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sm\:flex-row { flex-direction: row; }
}

@media (min-width: 768px) {
  .container { padding-left: var(--space-6); padding-right: var(--space-6); }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .md\:flex-row { flex-direction: row; }
  .md\:text-left { text-align: left; }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:gap-8 { gap: var(--space-8); }
}

@media (min-width: 1280px) {
  .xl\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .container { padding-left: var(--space-4); padding-right: var(--space-4); }

  .grid-auto-fit,
  .grid-auto-fill {
    grid-template-columns: 1fr;
  }

  .hero-title { font-size: var(--font-size-3xl); }
  .hero-subtitle { font-size: var(--font-size-lg); }

  .mobile-stack { flex-direction: column !important; }
  .mobile-full { width: 100% !important; }
  .mobile-hidden { display: none !important; }
}

@media (max-width: 480px) {
  .hero { padding: var(--space-16) 0; }
  .hero-title { font-size: var(--font-size-2xl); }
  .text-5xl { font-size: var(--font-size-3xl); }
  .text-6xl { font-size: var(--font-size-4xl); }
}

/* Touch-friendly on mobile */
@media (max-width: 768px) {
  .btn { min-height: 48px; }
  .form-input { min-height: 48px; font-size: 16px; /* prevent zoom on iOS */ }
  .nav-link { min-height: 48px; }
}

/* Performance hints */
.card-interactive,
.btn,
.nav-link {
  will-change: transform;
}

/* Print styles */
@media print {
  .nav, .skip-link, .mobile-menu-btn { display: none !important; }
  .card { box-shadow: none; border: 1px solid #ccc; }
  body { background: white; color: black; }
  a { text-decoration: underline; color: black; }
}