/**
 * ParkerBarker CSS - Standalone Version
 * A user-friendly design system prioritizing clarity and accessibility
 * 
 * Usage:
 *   <link rel="stylesheet" href="parkerbarker/css/parkerbarker.css">
 */

/* ==================================================
   Font Face Declarations
   ================================================== */

@font-face {
  font-family: 'GT Ultra Fine';
  src: url('../fonts/GT-Ultra-Fine-Light.woff2') format('woff2'),
       url('../fonts/GT-Ultra-Fine-Light.woff') format('woff'),
       url('../fonts/GT-Ultra-Fine-Light.ttf') format('truetype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'GT Ultra Fine';
  src: url('../fonts/GT-Ultra-Fine-Bold.woff2') format('woff2'),
       url('../fonts/GT-Ultra-Fine-Bold.woff') format('woff'),
       url('../fonts/GT-Ultra-Fine-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'GT Ultra Standard';
  src: url('../fonts/GT-Ultra-Standard-Light.woff2') format('woff2'),
       url('../fonts/GT-Ultra-Standard-Light.woff') format('woff'),
       url('../fonts/GT-Ultra-Standard-Light.ttf') format('truetype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'GT Ultra Standard';
  src: url('../fonts/GT-Ultra-Standard-Bold.woff2') format('woff2'),
       url('../fonts/GT-Ultra-Standard-Bold.woff') format('woff'),
       url('../fonts/GT-Ultra-Standard-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ==================================================
   Variables & Design Tokens
   ================================================== */

:root {
  /* Color Palette */
  --pb-primary: #4a90e2;
  --pb-primary-rgb: 74, 144, 226;
  --pb-primary-dark: #3a7bc8;
  --pb-secondary: #7ed321;
  --pb-accent: #f5a623;
  --pb-accent-rgb: 245, 166, 35;
  --pb-danger: #d0021b;
  --pb-gray-100: #f8f9fa;
  --pb-gray-200: #e9ecef;
  --pb-gray-300: #dee2e6;
  --pb-gray-600: #6c757d;
  --pb-gray-900: #212529;
  --pb-white: #ffffff;

  /* Typography */
  --pb-font-sans: 'GT Ultra Standard', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --pb-font-serif: 'GT Ultra Fine', Georgia, serif;
  --pb-font-size-xs: 0.8rem;
  --pb-font-size-sm: 0.875rem;
  --pb-font-size-base: 1rem;
  --pb-font-size-lg: 1.125rem;
  --pb-font-size-xl: 1.375rem;
  --pb-font-size-2xl: 1.75rem;
  --pb-line-height: 1.5;
  --pb-line-height-tight: 1.2;

  /* Spacing */
  --pb-space-xs: 0.25rem;
  --pb-space-sm: 0.5rem;
  --pb-space-md: 1rem;
  --pb-space-lg: 1.5rem;
  --pb-space-xl: 2rem;
  --pb-space-2xl: 3rem;

  /* iOS Safe Area Insets */
  --pb-safe-area-top: env(safe-area-inset-top, 0px);
  --pb-safe-area-right: env(safe-area-inset-right, 0px);
  --pb-safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --pb-safe-area-left: env(safe-area-inset-left, 0px);

  /* Border Radius */
  --pb-radius-sm: 0.25rem;
  --pb-radius-md: 0.5rem;
  --pb-radius-lg: 1rem;
  --pb-radius-full: 9999px;

  /* Shadows */
  --pb-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --pb-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --pb-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --pb-transition: 0.2s ease-in-out;

  /* Interactive sizing - increased for iOS */
  --pb-min-target-size: 48px;
}

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

*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  height: 100%;
  -webkit-overflow-scrolling: touch;
}

body {
  font-family: var(--pb-font-sans);
  font-size: var(--pb-font-size-base);
  line-height: var(--pb-line-height);
  color: var(--pb-gray-900);
  background-color: var(--pb-gray-100);
  margin: 0;
  padding: 0;
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

/* Typography System */
h1, h2, h3 {
  font-family: var(--pb-font-serif);
  margin-top: var(--pb-space-lg);
  margin-bottom: var(--pb-space-md);
  font-weight: 700;
  line-height: var(--pb-line-height-tight);
  color: var(--pb-gray-900);
}

h4, h5, h6 {
  font-family: var(--pb-font-sans);
  margin-top: var(--pb-space-lg);
  margin-bottom: var(--pb-space-md);
  font-weight: 700;
  line-height: var(--pb-line-height-tight);
  color: var(--pb-gray-900);
}

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

p, li, td, th, input, select, textarea, button {
  font-family: var(--pb-font-sans);
  font-weight: 300;
}

strong, b, th {
  font-weight: 700;
}

em, i {
  font-style: italic;
}

small {
  font-size: var(--pb-font-size-sm);
  color: var(--pb-gray-600);
}

blockquote {
  font-family: var(--pb-font-serif);
  border-left: 3px solid var(--pb-primary);
  padding-left: var(--pb-space-md);
  margin: var(--pb-space-md) 0;
  font-style: italic;
  color: var(--pb-gray-600);
}

code {
  font-family: monospace;
  background-color: var(--pb-gray-200);
  padding: 0.125em 0.25em;
  border-radius: var(--pb-radius-sm);
  font-size: 0.9em;
}

p {
  margin-top: 0;
  margin-bottom: var(--pb-space-md);
}

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

/* Base link styles */
a {
  color: var(--pb-primary);
  text-decoration: none;
  transition: color var(--pb-transition);
  font-weight: 700;
  padding: 0.125em;
  margin: -0.125em;
}

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

a:active {
  opacity: 0.7;
}

/* Special text treatments */
.pb-display {
  font-family: var(--pb-font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.pb-subtitle {
  font-family: var(--pb-font-sans);
  font-size: var(--pb-font-size-lg);
  font-weight: 300;
  color: var(--pb-gray-600);
}

.pb-quote {
  font-family: var(--pb-font-serif);
  font-size: var(--pb-font-size-xl);
  font-style: italic;
  line-height: 1.4;
}

.pb-caption {
  font-family: var(--pb-font-sans);
  font-size: var(--pb-font-size-sm);
  color: var(--pb-gray-600);
}

/* Lists */
ul, ol {
  padding-left: var(--pb-space-xl);
  margin-top: var(--pb-space-md);
  margin-bottom: var(--pb-space-md);
}

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

/* ==================================================
   Layout System
   ================================================== */

/* Containers */
.pb-container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--pb-container-padding, 1rem);
  padding-right: var(--pb-container-padding, 1rem);
  max-width: var(--pb-container-max-width, 80rem);
}

.pb-container-sm { max-width: var(--pb-container-sm, 40rem); }
.pb-container-md { max-width: var(--pb-container-md, 48rem); }
.pb-container-lg { max-width: var(--pb-container-lg, 64rem); }
.pb-container-xl { max-width: var(--pb-container-xl, 80rem); }
.pb-container-2xl { max-width: var(--pb-container-2xl, 96rem); }

.pb-container-fluid {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--pb-container-padding, 1rem);
  padding-right: var(--pb-container-padding, 1rem);
}

.pb-container-full-bleed {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.pb-content-container {
  max-width: var(--pb-content-max-width, 65ch);
  margin-left: auto;
  margin-right: auto;
}

/* Flexbox */
.pb-flex { display: flex; }
.pb-inline-flex { display: inline-flex; }
.pb-flex-row { flex-direction: row; }
.pb-flex-row-reverse { flex-direction: row-reverse; }
.pb-flex-col { flex-direction: column; }
.pb-flex-col-reverse { flex-direction: column-reverse; }
.pb-flex-wrap { flex-wrap: wrap; }
.pb-flex-nowrap { flex-wrap: nowrap; }
.pb-flex-wrap-reverse { flex-wrap: wrap-reverse; }

/* Justify content */
.pb-justify-start { justify-content: flex-start; }
.pb-justify-end { justify-content: flex-end; }
.pb-justify-center { justify-content: center; }
.pb-justify-between { justify-content: space-between; }
.pb-justify-around { justify-content: space-around; }
.pb-justify-evenly { justify-content: space-evenly; }

/* Align items */
.pb-items-start { align-items: flex-start; }
.pb-items-end { align-items: flex-end; }
.pb-items-center { align-items: center; }
.pb-items-baseline { align-items: baseline; }
.pb-items-stretch { align-items: stretch; }

/* Flex grow/shrink */
.pb-flex-1 { flex: 1 1 0%; }
.pb-flex-auto { flex: 1 1 auto; }
.pb-flex-initial { flex: 0 1 auto; }
.pb-flex-none { flex: none; }
.pb-grow { flex-grow: 1; }
.pb-grow-0 { flex-grow: 0; }
.pb-shrink { flex-shrink: 1; }
.pb-shrink-0 { flex-shrink: 0; }

/* Grid */
.pb-grid { display: grid; }
.pb-inline-grid { display: inline-grid; }

.pb-grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.pb-grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pb-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pb-grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.pb-grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.pb-grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.pb-grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.pb-grid-cols-auto { grid-template-columns: auto; }
.pb-grid-cols-auto-fit { grid-template-columns: repeat(auto-fit, minmax(var(--pb-grid-min-item-width, 250px), 1fr)); }
.pb-grid-cols-auto-fill { grid-template-columns: repeat(auto-fill, minmax(var(--pb-grid-min-item-width, 250px), 1fr)); }

/* Gap utilities */
.pb-gap-0 { gap: 0; }
.pb-gap-xs { gap: var(--pb-space-xs, 0.25rem); }
.pb-gap-sm { gap: var(--pb-space-sm, 0.5rem); }
.pb-gap-md { gap: var(--pb-space-md, 1rem); }
.pb-gap-lg { gap: var(--pb-space-lg, 1.5rem); }
.pb-gap-xl { gap: var(--pb-space-xl, 2rem); }
.pb-gap-2xl { gap: var(--pb-space-2xl, 3rem); }

/* Position utilities */
.pb-relative { position: relative; }
.pb-absolute { position: absolute; }
.pb-fixed { position: fixed; }
.pb-sticky { position: sticky; }
.pb-static { position: static; }

/* Inset utilities */
.pb-inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.pb-top-0 { top: 0; }
.pb-right-0 { right: 0; }
.pb-bottom-0 { bottom: 0; }
.pb-left-0 { left: 0; }

/* Z-index utilities */
.pb-z-0 { z-index: 0; }
.pb-z-10 { z-index: 10; }
.pb-z-20 { z-index: 20; }
.pb-z-30 { z-index: 30; }
.pb-z-40 { z-index: 40; }
.pb-z-50 { z-index: 50; }
.pb-z-auto { z-index: auto; }

/* Display utilities */
.pb-block { display: block; }
.pb-inline-block { display: inline-block; }
.pb-inline { display: inline; }
.pb-hidden { display: none; }

/* Overflow utilities */
.pb-overflow-auto { overflow: auto; }
.pb-overflow-hidden { overflow: hidden; }
.pb-overflow-visible { overflow: visible; }
.pb-overflow-scroll { overflow: scroll; }

/* Width/Height utilities */
.pb-w-full { width: 100%; }
.pb-w-auto { width: auto; }
.pb-w-screen { width: 100vw; }
.pb-h-full { height: 100%; }
.pb-h-auto { height: auto; }
.pb-h-screen { height: 100vh; }
.pb-min-h-screen { min-height: 100vh; }

/* Safe Area Utilities */
.pb-safe-top { padding-top: env(safe-area-inset-top); }
.pb-safe-right { padding-right: env(safe-area-inset-right); }
.pb-safe-bottom { padding-bottom: env(safe-area-inset-bottom); }
.pb-safe-left { padding-left: env(safe-area-inset-left); }

/* Stack patterns */
.pb-stack {
  display: flex;
  flex-direction: column;
}

.pb-stack > * + * {
  margin-top: var(--pb-stack-gap, var(--pb-space-md, 1rem));
}

.pb-hstack {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.pb-hstack > * + * {
  margin-left: var(--pb-hstack-gap, var(--pb-space-md, 1rem));
}

.pb-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Border and shadow utilities */
.pb-border { border: 1px solid var(--pb-border-color, #e5e7eb); }
.pb-border-t { border-top: 1px solid var(--pb-border-color, #e5e7eb); }
.pb-border-r { border-right: 1px solid var(--pb-border-color, #e5e7eb); }
.pb-border-b { border-bottom: 1px solid var(--pb-border-color, #e5e7eb); }
.pb-border-l { border-left: 1px solid var(--pb-border-color, #e5e7eb); }

.pb-rounded { border-radius: var(--pb-border-radius, 4px); }
.pb-rounded-lg { border-radius: var(--pb-border-radius-lg, 8px); }
.pb-rounded-full { border-radius: 9999px; }

.pb-shadow { box-shadow: var(--pb-shadow, 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06)); }
.pb-shadow-md { box-shadow: var(--pb-shadow-md, 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06)); }
.pb-shadow-lg { box-shadow: var(--pb-shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05)); }
.pb-shadow-none { box-shadow: none; }

/* ==================================================
   Links
   ================================================== */

a, .pb-link {
  color: var(--pb-primary);
  text-decoration: none;
  transition: color 0.2s, text-decoration 0.2s;
  cursor: pointer;
}

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

a:focus, .pb-link:focus {
  outline: 2px solid var(--pb-primary-light);
  outline-offset: 2px;
}

.pb-link-subtle { color: var(--pb-gray-700); }
.pb-link-subtle:hover { color: var(--pb-gray-900); }

.pb-link-contrast {
  color: var(--pb-white);
  text-decoration: underline;
}
.pb-link-contrast:hover { color: var(--pb-gray-200); }

.pb-link-icon {
  display: inline-flex;
  align-items: center;
  gap: var(--pb-space-xs);
}

.pb-link-external::after {
  content: "↗";
  display: inline-block;
  margin-left: 0.25em;
  font-size: 0.8em;
  vertical-align: super;
}

.pb-link-button {
  display: inline-block;
  padding: var(--pb-space-xs) var(--pb-space-sm);
  border-radius: var(--pb-radius-sm);
  background-color: transparent;
  border: 1px solid var(--pb-primary);
  text-align: center;
}
.pb-link-button:hover {
  background-color: var(--pb-primary-light);
  text-decoration: none;
}

.pb-link-disabled {
  color: var(--pb-gray-400);
  pointer-events: none;
  cursor: not-allowed;
}

.pb-nav-link {
  display: inline-block;
  padding: var(--pb-space-xs) var(--pb-space-sm);
  color: var(--pb-gray-700);
  font-weight: 500;
}
.pb-nav-link:hover {
  color: var(--pb-primary);
  text-decoration: none;
}
.pb-nav-link.pb-active {
  color: var(--pb-primary);
  font-weight: 700;
}

/* ==================================================
   Buttons
   ================================================== */

button.pb-button {
  display: inline-block;
  font-family: var(--pb-font-sans);
  font-weight: 700;
  font-size: var(--pb-font-size-base);
  padding: var(--pb-space-sm) var(--pb-space-md);
  min-height: var(--pb-min-target-size);
  border-radius: var(--pb-radius-sm);
  border: none;
  background-color: var(--pb-primary);
  color: var(--pb-white);
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--pb-transition);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  position: relative;
  box-shadow: var(--pb-shadow-sm);
}

.pb-button:hover {
  background-color: var(--pb-primary-dark);
  transform: translateY(-1px);
}

.pb-button:active {
  transform: translateY(1px);
}

.pb-button:focus {
  outline: none;
}

.pb-button[disabled] {
  background-color: var(--pb-gray-300);
  color: var(--pb-gray-600);
  cursor: not-allowed;
  box-shadow: none;
  pointer-events: none;
}

.pb-button-secondary {
  background-color: var(--pb-white);
  color: var(--pb-primary);
  border: 1px solid var(--pb-primary);
}
.pb-button-secondary:hover,
.pb-button-secondary:active {
  background-color: rgba(74, 144, 226, 0.1);
}

.pb-button-success { background-color: var(--pb-secondary); }
.pb-button-danger { background-color: var(--pb-danger); }

.pb-button-text {
  background: none;
  border: none;
  padding: var(--pb-space-sm);
  color: var(--pb-primary);
  font-weight: 700;
  box-shadow: none;
  min-height: auto;
}
.pb-button-text:hover,
.pb-button-text:active {
  background: none;
  color: var(--pb-primary-dark);
  text-decoration: underline;
}

/* ==================================================
   Dropdown
   ================================================== */

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-toggle {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.dropdown-toggle:hover {
  background-color: rgba(0, 0, 0, 0.1);
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: white;
  border: 1px solid var(--pb-gray-300);
  border-radius: var(--pb-radius-md);
  box-shadow: var(--pb-shadow-lg);
  min-width: 120px;
  z-index: 1000;
  overflow: hidden;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-item {
  display: block;
  padding: 8px 12px;
  text-decoration: none;
  color: var(--pb-gray-900);
  font-size: var(--pb-font-size-sm);
  transition: background-color 0.2s ease;
}

.dropdown-item:hover {
  background-color: var(--pb-gray-100);
  text-decoration: none;
}

/* ==================================================
   Forms
   ================================================== */

.pb-form {
  label {
    display: block;
    font-weight: 700;
    margin-bottom: var(--pb-space-sm);
    color: var(--pb-gray-900);
  }

  input,
  select,
  textarea {
    font-family: var(--pb-font-sans);
    font-size: var(--pb-font-size-base);
    width: 100%;
    border-radius: var(--pb-radius-sm);
    padding: var(--pb-space-sm) var(--pb-space-md);
    margin-bottom: var(--pb-space-sm);
    border: 1px solid var(--pb-gray-300);
  }

  input[type="date"],
  input[type="time"],
  input[type="datetime-local"] {
    display: block;
    min-height: var(--pb-min-target-size);
  }

  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='%236c757d' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--pb-space-sm) center;
    padding-right: 2.5rem;
  }

  input:focus,
  select:focus,
  textarea:focus {
    outline: none;
    border-color: var(--pb-primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.25);
  }

  ::placeholder {
    color: var(--pb-gray-600);
    opacity: 0.6;
  }

  input:invalid,
  select:invalid,
  textarea:invalid {
    border-color: var(--pb-danger);
  }

  .pb-form-error {
    color: var(--pb-danger);
    font-size: var(--pb-font-size-sm);
    margin-top: calc(-1 * var(--pb-space-md) + var(--pb-space-xs));
    margin-bottom: var(--pb-space-md);
  }

  .pb-form-help {
    color: var(--pb-gray-600);
    font-size: var(--pb-font-size-sm);
    margin-top: calc(-1 * var(--pb-space-md) + var(--pb-space-xs));
    margin-bottom: var(--pb-space-md);
  }

  .pb-checkbox,
  .pb-radio {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: var(--pb-space-sm);
    cursor: pointer;
    user-select: none;
  }

  .pb-checkbox input[type="checkbox"],
  .pb-radio input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
    margin: 0;
  }

  .pb-checkbox-label,
  .pb-radio-label {
    padding-left: 2rem;
    cursor: pointer;
    min-height: var(--pb-min-target-size);
    display: flex;
    align-items: center;
  }

  .pb-checkbox-label::before,
  .pb-radio-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--pb-gray-600);
    transition: all var(--pb-transition);
  }

  .pb-checkbox-label::before { border-radius: var(--pb-radius-sm); }
  .pb-radio-label::before { border-radius: 50%; }

  .pb-checkbox input[type="checkbox"]:checked~.pb-checkbox-label::before {
    background-color: var(--pb-primary);
    border-color: var(--pb-primary);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='white' d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
    background-size: 85%;
    background-position: center;
    background-repeat: no-repeat;
  }

  .pb-radio input[type="radio"]:checked~.pb-radio-label::before {
    border-color: var(--pb-primary);
    box-shadow: inset 0 0 0 4px var(--pb-primary);
  }

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

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

.pb-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--pb-space-md) 0;
  background-color: var(--pb-white);
  box-shadow: var(--pb-shadow-sm);
  padding-top: calc(var(--pb-space-md) + var(--pb-safe-area-top));
  padding-left: var(--pb-safe-area-left);
  padding-right: var(--pb-safe-area-right);
}

.pb-nav-brand {
  font-family: var(--pb-font-serif);
  font-size: var(--pb-font-size-lg);
  font-weight: 700;
  color: var(--pb-gray-900);
}

.pb-nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.pb-nav-item {
  margin: 0 var(--pb-space-sm);
}

.pb-nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--pb-space-sm) var(--pb-space-md);
  color: var(--pb-gray-900);
  text-decoration: none;
  font-weight: 700;
  min-height: var(--pb-min-target-size);
  border-radius: var(--pb-radius-sm);
}

.pb-nav-link:hover, .pb-nav-link:focus, .pb-nav-link.active {
  color: var(--pb-primary);
  background-color: rgba(74, 144, 226, 0.1);
}

.pb-nav-bottom {
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 100%;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--pb-white);
  box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
  z-index: 1000;
  padding: var(--pb-space-sm) 0;
  padding-bottom: calc(var(--pb-space-sm) + var(--pb-safe-area-bottom));
}

.pb-has-bottom-nav {
  padding-bottom: calc(60px + var(--pb-safe-area-bottom));
}

@media (max-width: 768px) {
  .pb-nav {
    flex-wrap: wrap;
    padding: var(--pb-space-sm) var(--pb-space-md);
  }
  
  .pb-nav-list {
    flex-direction: column;
    width: 100%;
  }
  
  .pb-nav-item {
    margin: var(--pb-space-xs) 0;
  }
  
  .pb-nav-link {
    display: block;
    width: 100%;
  }
}

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

/* Tabs */
[role="tablist"] {
  display: flex;
  border-bottom: 1px solid var(--pb-gray-300);
  margin-bottom: var(--pb-space-md);
}

[role="tab"] {
  padding: var(--pb-space-sm) var(--pb-space-md);
  border: none;
  background: none;
  font-weight: 700;
  color: var(--pb-gray-600);
  cursor: pointer;
  margin-right: var(--pb-space-sm);
  position: relative;
}

[role="tab"]:after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background-color: transparent;
  transition: background-color var(--pb-transition);
}

[role="tab"].active { color: var(--pb-primary); }
[role="tab"].active:after { background-color: var(--pb-primary); }

[role="tabpanel"] { display: none; }
[role="tabpanel"].active { display: block; }

/* Details/Accordion */
details.pb-details {
  margin-bottom: var(--pb-space-md);
}

details.pb-details summary {
  cursor: pointer;
  user-select: none;
  list-style: none;
  position: relative;
  font-weight: 700;
  min-height: var(--pb-min-target-size);
  display: flex;
  align-items: center;
  padding: var(--pb-space-sm) var(--pb-space-md);
  border-radius: var(--pb-radius-md);
  background-color: var(--pb-white);
  color: var(--pb-primary);
  border: 1px solid var(--pb-primary);
  box-shadow: var(--pb-shadow-sm);
  transition: all var(--pb-transition);
}

details.pb-details summary::-webkit-details-marker { display: none; }

details.pb-details summary::before {
  content: '';
  display: inline-block;
  width: 0.75em;
  height: 0.75em;
  margin-right: var(--pb-space-sm);
  border-right: 2px solid var(--pb-primary);
  border-bottom: 2px solid var(--pb-primary);
  transform: rotate(-45deg);
  transition: transform var(--pb-transition);
}

details[open].pb-details summary::before { transform: rotate(45deg); }
details.pb-details summary:hover { background-color: rgba(74, 144, 226, 0.1); }
details.pb-details summary:active { transform: translateY(1px); }

details.pb-details .pb-details-content {
  padding: var(--pb-space-md);
  animation: pb-details-fade 0.3s ease-in-out;
  margin-top: var(--pb-space-sm);
}

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

/* Alerts */
.pb-alert {
  display: flex;
  border-radius: var(--pb-radius-md);
  padding: var(--pb-space-md);
  margin-bottom: var(--pb-space-md);
  background-color: var(--pb-white);
  box-shadow: var(--pb-shadow-sm);
}

.pb-alert-title {
  margin-top: 0;
  margin-bottom: var(--pb-space-xs);
  font-weight: 700;
  font-size: var(--pb-font-size-lg);
}

.pb-alert-info { border-left: 4px solid var(--pb-primary); }
.pb-alert-success { border-left: 4px solid var(--pb-secondary); }
.pb-alert-warning { border-left: 4px solid var(--pb-accent); }
.pb-alert-error { border-left: 4px solid var(--pb-danger); }

/* Toast notifications */
.pb-toast {
  position: fixed;
  left: 50%;
  bottom: calc(16px + var(--pb-safe-area-bottom));
  transform: translateX(-50%) translateY(100%);
  max-width: calc(100% - 32px);
  width: auto;
  background-color: var(--pb-gray-900);
  color: var(--pb-white);
  padding: var(--pb-space-md) var(--pb-space-lg);
  border-radius: var(--pb-radius-full);
  box-shadow: var(--pb-shadow-md);
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 2000;
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
}

.pb-toast-container {
  position: fixed;
  bottom: 1rem;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  z-index: 2000;
  pointer-events: none;
  padding-bottom: var(--pb-safe-area-bottom);
}

.pb-toast-container .pb-toast {
  position: relative;
  transform: translateY(100%);
  left: auto;
  bottom: auto;
  margin-bottom: var(--pb-space-sm);
  max-width: 90%;
  pointer-events: auto;
}

.pb-toast-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.pb-toast-container .pb-toast-visible {
  transform: translateY(0);
  opacity: 1;
}

.pb-toast-info { background-color: var(--pb-primary); }
.pb-toast-success { background-color: var(--pb-secondary); }
.pb-toast-warning { background-color: var(--pb-accent); }
.pb-toast-error { background-color: var(--pb-danger); }

.pb-toast-close {
  border: none;
  background: none;
  color: var(--pb-white);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0;
  margin-left: var(--pb-space-sm);
  cursor: pointer;
  opacity: 0.7;
  width: 24px;
  height: 24px;
  min-height: 0;
}

.pb-toast-close:hover { opacity: 1; }

/* ==================================================
   Icons
   ================================================== */

.pb-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  margin-right: var(--pb-space-sm);
  fill: currentColor;
}

.pb-emoji {
  font-style: normal;
  font-size: 1.5em;
  line-height: 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pb-emoji-xs { font-size: 1em; }
.pb-emoji-sm { font-size: 1.25em; }
.pb-emoji-lg { font-size: 2em; }
.pb-emoji-xl { font-size: 3em; }

.pb-emoji-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--pb-space-md);
  margin-bottom: var(--pb-space-md);
}

.pb-emoji-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.pb-status {
  display: inline-flex;
  align-items: center;
  margin-right: var(--pb-space-md);
  font-weight: 500;
}

.pb-list-with-icons {
  list-style: none;
  padding-left: 0;
}

.pb-list-with-icons li {
  display: flex;
  align-items: center;
  margin-bottom: var(--pb-space-sm);
}

/* ==================================================
   Cards
   ================================================== */

.pb-card {
  background-color: var(--pb-card-bg, white);
  border-radius: var(--pb-border-radius, 4px);
  padding: var(--pb-space-md, 1rem);
  margin-bottom: var(--pb-space-md, 1rem);
  box-shadow: var(--pb-shadow, 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06));
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  overflow: hidden;
  border: var(--pb-card-border, 1px solid var(--pb-border-color, #edf2f7));
}

.pb-card-header {
  padding-bottom: var(--pb-space-sm, 0.5rem);
  margin-bottom: var(--pb-space-sm, 0.5rem);
  border-bottom: var(--pb-card-header-border, 1px solid var(--pb-border-color, #edf2f7));
}

.pb-card-title {
  margin-top: 0;
  margin-bottom: var(--pb-space-xs, 0.25rem);
  font-size: var(--pb-font-size-lg, 1.25rem);
  font-weight: var(--pb-font-weight-bold, 700);
  color: var(--pb-card-title-color, inherit);
  line-height: 1.2;
}

.pb-card-subtitle {
  margin-top: 0;
  margin-bottom: var(--pb-space-xs, 0.25rem);
  font-size: var(--pb-font-size-sm, 0.875rem);
  color: var(--pb-card-subtitle-color, #666);
  line-height: 1.4;
}

.pb-card-body {
  flex: 1 1 auto;
  padding: 0;
}

.pb-card-footer {
  padding-top: var(--pb-space-sm, 0.5rem);
  margin-top: var(--pb-space-sm, 0.5rem);
  border-top: var(--pb-card-footer-border, 1px solid var(--pb-border-color, #edf2f7));
}

.pb-card-clickable { cursor: pointer; }
.pb-card-clickable:hover {
  transform: translateY(-2px);
  box-shadow: var(--pb-shadow-md);
}
.pb-card-clickable:active { transform: translateY(0); }

.pb-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--pb-space-md, 1rem);
}

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

/* Margin utilities */
.pb-mb-0 { margin-bottom: 0; }
.pb-mb-1 { margin-bottom: var(--pb-space-sm); }
.pb-mb-2 { margin-bottom: var(--pb-space-md); }
.pb-mb-3 { margin-bottom: var(--pb-space-lg); }
.pb-mb-4 { margin-bottom: var(--pb-space-xl); }

.pb-mt-0 { margin-top: 0; }
.pb-mt-1 { margin-top: var(--pb-space-sm); }
.pb-mt-2 { margin-top: var(--pb-space-md); }
.pb-mt-3 { margin-top: var(--pb-space-lg); }
.pb-mt-4 { margin-top: var(--pb-space-xl); }

.pb-ml-1 { margin-left: var(--pb-space-sm); }
.pb-mr-2 { margin-right: var(--pb-space-md); }

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

/* Focus styling */
:focus-visible {
  outline: 3px solid rgba(74, 144, 226, 0.5);
  outline-offset: 1px;
}

/* Tooltip */
[data-tooltip] {
  position: relative;
  cursor: help;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background-color: var(--pb-gray-900);
  color: var(--pb-white);
  padding: var(--pb-space-xs) var(--pb-space-sm);
  border-radius: var(--pb-radius-sm);
  font-size: var(--pb-font-size-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
  box-shadow: var(--pb-shadow-md);
}

@media (hover: hover) {
  [data-tooltip]:hover::after,
  [data-tooltip]:focus::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
  }
}

/* Loading indicator */
.pb-loading {
  position: relative;
  pointer-events: none;
}

.pb-loading::after {
  content: '';
  position: absolute;
  width: 1.2em;
  height: 1.2em;
  top: calc(50% - 0.6em);
  right: var(--pb-space-md);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border-top-color: var(--pb-white);
  animation: pb-spin 0.6s linear infinite;
}

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

/* Badge */
.pb-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--pb-radius-full);
  background-color: var(--pb-primary);
  color: var(--pb-white);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
  padding: 0.25rem 0.5rem;
  min-width: 1.25rem;
  vertical-align: middle;
  margin-left: var(--pb-space-xs);
}

/* Text utilities */
.pb-text-center { text-align: center; }
.pb-text-serif { font-family: var(--pb-font-serif); }
.pb-text-sans { font-family: var(--pb-font-sans); }
.pb-text-bold { font-weight: 700; }
.pb-text-light { font-weight: 300; }

/* Hidden utility */
.hidden { display: none; }

/* ==================================================
   Media
   ================================================== */

.pb-img-container {
  width: 100%;
  overflow: hidden;
  position: relative;
}

.pb-img-ios {
  -webkit-user-drag: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

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

.pb-scroll-container {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  overscroll-behavior: contain;
}

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

@media (max-width: 576px) {
  :root {
    --pb-space-lg: 1.25rem;
    --pb-space-xl: 1.5rem;
  }
  
  .pb-container {
    padding-left: calc(var(--pb-space-sm) + var(--pb-safe-area-left));
    padding-right: calc(var(--pb-space-sm) + var(--pb-safe-area-right));
  }
  
  button.pb-button {
    display: block;
    width: 100%;
  }
}

@media (prefers-contrast: high) {
  :root {
    --pb-primary: #0066cc;
    --pb-primary-dark: #004d99;
    --pb-gray-600: #555555;
    --pb-gray-900: #000000;
  }
  
  a, button, .pb-button {
    text-decoration: underline;
    text-underline-offset: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  
  .pb-loading::after {
    animation: none !important;
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-top-color: var(--pb-white);
    border-right-color: var(--pb-white);
  }
  
  details.pb-details .pb-details-content {
    animation: none;
  }
}

/* ==================================================
   iOS Specific
   ================================================== */

.pb-ios {
  width: 100%;
  height: 100%;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  overflow-x: hidden;
}

.pb-touch { cursor: pointer; }
.pb-reduced-motion { }
.pb-standalone { }

.pb-standalone body {
  margin: 0;
  padding: 0;
  height: 100vh;
}

.pb-keyboard-focus :focus {
  outline: 3px solid rgba(74, 144, 226, 0.5);
}

.pb-keyboard-focus :focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

.pb-keyboard-visible {
  padding-bottom: 0 !important;
}

/* ==================================================
   Dark Mode
   ================================================== */

.pb-dark-mode {
  --pb-gray-100: #1a1a2e;
  --pb-gray-200: #16213e;
  --pb-gray-300: #0f3460;
  --pb-gray-600: #94a3b8;
  --pb-gray-900: #f1f5f9;
  --pb-white: #0f172a;
  --pb-card-bg: #1e293b;
  --pb-border-color: #334155;
}

.pb-dark-mode body {
  background-color: var(--pb-gray-100);
  color: var(--pb-gray-900);
}

.pb-dark-mode .pb-card {
  background-color: var(--pb-card-bg);
  border-color: var(--pb-border-color);
}

.pb-dark-mode .pb-toast {
  background-color: var(--pb-gray-900);
  color: var(--pb-gray-100);
}