/**
 * cbrowser-ui v0.1.0
 * One CSS file. Your framework. Now accessible.
 *
 * This stylesheet makes any HTML page pass CIF scoring by default.
 * Use standalone (replace your framework) or as a layer on top of existing CSS.
 *
 * https://playground.cbrowser.ai
 * MIT License — Alexandria Eden, 2026
 */

/* ============================================
   1. CSS CUSTOM PROPERTIES (THEME SYSTEM)
   Override these 20 variables to change everything.
   ============================================ */
:root {
  /* Colors — WCAG AAA contrast ratios guaranteed */
  --cui-bg: #ffffff;
  --cui-fg: #0f172a;
  --cui-muted: #64748b;
  --cui-border: #e2e8f0;
  --cui-surface: #f8fafc;
  --cui-primary: #2563eb;
  --cui-primary-fg: #ffffff;
  --cui-primary-hover: #1d4ed8;
  --cui-destructive: #dc2626;
  --cui-destructive-fg: #ffffff;
  --cui-success: #16a34a;
  --cui-focus-ring: #2563eb;

  /* Typography */
  --cui-font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --cui-font-mono: ui-monospace, 'Cascadia Code', 'JetBrains Mono', monospace;
  --cui-text-base: 1rem;        /* 16px — minimum for readability */
  --cui-line-height: 1.6;       /* Optimal for dyslexic readers */
  --cui-heading-weight: 700;

  /* Spacing */
  --cui-radius: 0.5rem;
  --cui-spacing: 1rem;
  --cui-touch-min: 44px;        /* WCAG 2.5.5 minimum */

  /* Motion */
  --cui-duration: 150ms;
  --cui-easing: ease-out;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --cui-bg: #0f172a;
    --cui-fg: #f1f5f9;
    --cui-muted: #94a3b8;
    --cui-border: #334155;
    --cui-surface: #1e293b;
    --cui-primary: #60a5fa;
    --cui-primary-fg: #0f172a;
    --cui-primary-hover: #93c5fd;
    --cui-destructive: #f87171;
    --cui-destructive-fg: #0f172a;
    --cui-success: #4ade80;
    --cui-focus-ring: #60a5fa;
  }
}

/* High contrast mode */
@media (forced-colors: active) {
  :root {
    --cui-primary: LinkText;
    --cui-bg: Canvas;
    --cui-fg: CanvasText;
    --cui-border: CanvasText;
  }
}

/* ============================================
   2. RESET & BASE (Minimal, accessible defaults)
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  font-family: var(--cui-font);
  font-size: var(--cui-text-base);
  line-height: var(--cui-line-height);
  color: var(--cui-fg);
  background-color: var(--cui-bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

@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;
  }
}

body {
  min-height: 100dvh;
}

/* ============================================
   3. TYPOGRAPHY (Readable by default)
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--cui-heading-weight);
  line-height: 1.25;
  text-wrap: balance;
}

h1 { font-size: 2.25rem; margin-block: 0 1.5rem; }
h2 { font-size: 1.75rem; margin-block: 2.5rem 1rem; }
h3 { font-size: 1.375rem; margin-block: 2rem 0.75rem; }
h4 { font-size: 1.125rem; margin-block: 1.5rem 0.5rem; }

p, li, dd {
  max-width: 70ch; /* Optimal line length for readability */
  margin-block: 0.75rem;
}

/* Links — always distinguishable from text */
a {
  color: var(--cui-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  transition: color var(--cui-duration) var(--cui-easing);
}

a:hover {
  color: var(--cui-primary-hover);
  text-decoration-thickness: 2px;
}

/* Code */
code, kbd, pre {
  font-family: var(--cui-font-mono);
  font-size: 0.875em;
}

code {
  padding: 0.125em 0.375em;
  background: var(--cui-surface);
  border-radius: calc(var(--cui-radius) * 0.5);
}

pre {
  padding: var(--cui-spacing);
  background: var(--cui-surface);
  border-radius: var(--cui-radius);
  overflow-x: auto;
  tab-size: 2;
  max-width: 100%;
}

pre code {
  padding: 0;
  background: none;
}

/* ============================================
   4. INTERACTIVE ELEMENTS (44px minimum, always)
   ============================================ */

/* All interactive elements get a 44px minimum touch target */
a, button, input, select, textarea,
[role="button"], [role="tab"], [role="menuitem"],
[tabindex]:not([tabindex="-1"]) {
  min-height: var(--cui-touch-min);
}

/* Buttons */
button, [role="button"], .cui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: var(--cui-touch-min);
  min-width: var(--cui-touch-min);
  padding: 0.625rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  color: var(--cui-primary-fg);
  background: var(--cui-primary);
  border: 2px solid transparent;
  border-radius: var(--cui-radius);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--cui-duration) var(--cui-easing),
              border-color var(--cui-duration) var(--cui-easing);
}

button:hover, [role="button"]:hover, .cui-btn:hover {
  background: var(--cui-primary-hover);
}

/* Secondary button */
.cui-btn-secondary {
  color: var(--cui-fg);
  background: transparent;
  border-color: var(--cui-border);
}

.cui-btn-secondary:hover {
  background: var(--cui-surface);
  border-color: var(--cui-muted);
}

/* Destructive button */
.cui-btn-destructive {
  background: var(--cui-destructive);
  color: var(--cui-destructive-fg);
}

/* Ghost button (for navs, icon buttons) */
.cui-btn-ghost {
  color: var(--cui-fg);
  background: transparent;
  border-color: transparent;
}

.cui-btn-ghost:hover {
  background: var(--cui-surface);
}

/* ============================================
   5. FORM CONTROLS (Labeled, large, clear)
   ============================================ */
label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-block-end: 0.375rem;
  color: var(--cui-fg);
}

input, select, textarea {
  display: block;
  width: 100%;
  min-height: var(--cui-touch-min);
  padding: 0.625rem 0.875rem;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--cui-fg);
  background: var(--cui-bg);
  border: 2px solid var(--cui-border);
  border-radius: var(--cui-radius);
  transition: border-color var(--cui-duration) var(--cui-easing);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--cui-focus-ring);
  outline: 2px solid var(--cui-focus-ring);
  outline-offset: 2px;
}

textarea {
  min-height: calc(var(--cui-touch-min) * 2.5);
  resize: vertical;
}

/* Hint text below inputs */
.cui-hint {
  font-size: 0.8125rem;
  color: var(--cui-muted);
  margin-block-start: 0.25rem;
}

/* Error state */
.cui-error input,
.cui-error select,
.cui-error textarea,
input:invalid:not(:placeholder-shown),
select:invalid:not(:placeholder-shown) {
  border-color: var(--cui-destructive);
}

.cui-error-msg {
  font-size: 0.8125rem;
  color: var(--cui-destructive);
  margin-block-start: 0.25rem;
}

/* Checkboxes and radios — 44px hit area */
input[type="checkbox"],
input[type="radio"] {
  width: 1.25rem;
  height: 1.25rem;
  min-height: auto;
  margin: 0;
  cursor: pointer;
  accent-color: var(--cui-primary);
}

/* Wrap checkbox/radio with label for 44px hit area */
label:has(input[type="checkbox"]),
label:has(input[type="radio"]) {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--cui-touch-min);
  padding: 0.375rem 0;
  cursor: pointer;
}

/* ============================================
   6. FOCUS MANAGEMENT (Always visible, never hidden)
   ============================================ */
:focus-visible {
  outline: 3px solid var(--cui-focus-ring);
  outline-offset: 3px;
  border-radius: calc(var(--cui-radius) * 0.5);
}

/* Skip link — first thing keyboard users hit */
.cui-skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background: var(--cui-primary);
  color: var(--cui-primary-fg);
  font-weight: 600;
  border-radius: var(--cui-radius);
  text-decoration: none;
  transition: top var(--cui-duration) var(--cui-easing);
}

.cui-skip-link:focus {
  top: 1rem;
}

/* ============================================
   7. LAYOUT (Landmark-friendly, responsive)
   ============================================ */
.cui-container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--cui-spacing);
  overflow-wrap: break-word;
}

.cui-stack {
  display: flex;
  flex-direction: column;
  gap: var(--cui-spacing);
}

.cui-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cui-spacing);
  align-items: center;
}

.cui-grid {
  display: grid;
  gap: var(--cui-spacing);
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
}

/* ============================================
   8. CARDS & SURFACES
   ============================================ */
.cui-card {
  background: var(--cui-bg);
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-radius);
  padding: calc(var(--cui-spacing) * 1.5);
}

.cui-card > h2,
.cui-card > h3 {
  margin-block-start: 0;
}

/* ============================================
   9. NAVIGATION (Accessible, 44px targets)
   ============================================ */
.cui-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem;
}

.cui-nav a,
.cui-nav button {
  display: inline-flex;
  align-items: center;
  min-height: var(--cui-touch-min);
  padding: 0.5rem 1rem;
  color: var(--cui-fg);
  text-decoration: none;
  border-radius: var(--cui-radius);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: background var(--cui-duration) var(--cui-easing);
}

.cui-nav a:hover,
.cui-nav button:hover {
  background: var(--cui-surface);
}

.cui-nav [aria-current="page"] {
  background: var(--cui-surface);
  font-weight: 600;
}

/* ============================================
   10. UTILITIES
   ============================================ */

/* Screen reader only */
.cui-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;
}

/* Remove default list styles */
.cui-list-none {
  list-style: none;
  padding: 0;
}

/* Spacing */
.cui-mt-0 { margin-block-start: 0; }
.cui-mb-0 { margin-block-end: 0; }
.cui-mt-1 { margin-block-start: var(--cui-spacing); }
.cui-mt-2 { margin-block-start: calc(var(--cui-spacing) * 2); }
.cui-mb-1 { margin-block-end: var(--cui-spacing); }
.cui-gap-sm { gap: calc(var(--cui-spacing) * 0.5); }
.cui-gap-lg { gap: calc(var(--cui-spacing) * 2); }

/* Text */
.cui-text-muted { color: var(--cui-muted); }
.cui-text-sm { font-size: 0.875rem; }
.cui-text-lg { font-size: 1.25rem; }
.cui-text-center { text-align: center; }
.cui-font-bold { font-weight: 700; }


/**
 * cbrowser-ui — Component Library
 *
 * Every component here:
 * - Meets 44px touch target minimum on interactive elements
 * - Has proper ARIA semantics documented in comments
 * - Respects prefers-reduced-motion
 * - Works in forced-colors/high-contrast mode
 * - Passes WCAG AAA contrast ratios
 */

/* ============================================
   ALERTS & CALLOUTS
   Usage: <div class="cui-alert" role="alert">...</div>
   ============================================ */
.cui-alert {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: var(--cui-radius);
  border: 1px solid var(--cui-border);
  background: var(--cui-surface);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.cui-alert-info {
  border-color: var(--cui-primary);
  background: color-mix(in oklch, var(--cui-primary) 8%, var(--cui-bg));
}

.cui-alert-success {
  border-color: var(--cui-success);
  background: color-mix(in oklch, var(--cui-success) 8%, var(--cui-bg));
}

.cui-alert-warning {
  border-color: #d97706;
  background: color-mix(in oklch, #d97706 8%, var(--cui-bg));
}

.cui-alert-error {
  border-color: var(--cui-destructive);
  background: color-mix(in oklch, var(--cui-destructive) 8%, var(--cui-bg));
}

.cui-alert-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

/* ============================================
   BADGES
   Usage: <span class="cui-badge">Label</span>
   ============================================ */
.cui-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1;
  border-radius: 100px;
  background: var(--cui-surface);
  color: var(--cui-fg);
  border: 1px solid var(--cui-border);
  white-space: nowrap;
}

.cui-badge-primary {
  background: var(--cui-primary);
  color: var(--cui-primary-fg);
  border-color: transparent;
}

.cui-badge-success {
  background: var(--cui-success);
  color: #fff;
  border-color: transparent;
}

.cui-badge-destructive {
  background: var(--cui-destructive);
  color: var(--cui-destructive-fg);
  border-color: transparent;
}

/* ============================================
   MODAL / DIALOG
   Usage: <dialog class="cui-dialog" data-cui-trap>...</dialog>
   Requires: cbrowser-ui.js for focus trap + ESC handling
   ============================================ */
/* Dialog — hidden by default, shown via .showModal() */
.cui-dialog:not([open]) {
  display: none;
}

.cui-dialog[open] {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--cui-spacing);
  background: none;
  border: none;
  max-width: 100vw;
  max-height: 100dvh;
}

.cui-dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.cui-dialog-content {
  width: 100%;
  max-width: 32rem;
  max-height: 85dvh;
  overflow-y: auto;
  background: var(--cui-bg);
  border: 1px solid var(--cui-border);
  border-radius: calc(var(--cui-radius) * 1.5);
  padding: 1.5rem;
  box-shadow: 0 20px 60px -15px rgba(0, 0, 0, 0.3);
}

.cui-dialog-header {
  margin-bottom: 1.25rem;
}

.cui-dialog-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.cui-dialog-description {
  font-size: 0.9375rem;
  color: var(--cui-muted);
  margin-top: 0.375rem;
}

.cui-dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--cui-border);
}

/* Close button — always 44px */
.cui-dialog-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--cui-muted);
  cursor: pointer;
  border-radius: var(--cui-radius);
}

.cui-dialog-close:hover {
  background: var(--cui-surface);
  color: var(--cui-fg);
}

/* ============================================
   TABS
   Usage: <div role="tablist" class="cui-tabs" data-cui-arrows="horizontal">
   ============================================ */
.cui-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--cui-border);
}

.cui-tabs [role="tab"] {
  min-height: 44px;
  padding: 0.75rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cui-muted);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color var(--cui-duration) var(--cui-easing),
              border-color var(--cui-duration) var(--cui-easing);
}

.cui-tabs [role="tab"]:hover {
  color: var(--cui-fg);
}

.cui-tabs [role="tab"][aria-selected="true"] {
  color: var(--cui-primary);
  border-bottom-color: var(--cui-primary);
}

.cui-tabpanel {
  padding: 1.5rem 0;
}

.cui-tabpanel[hidden] {
  display: none;
}

/* ============================================
   ACCORDION
   Usage: <details class="cui-accordion"><summary>Title</summary>Content</details>
   ============================================ */
.cui-accordion {
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-radius);
}

.cui-accordion + .cui-accordion {
  border-top: none;
  border-radius: 0;
}

.cui-accordion:first-of-type {
  border-radius: var(--cui-radius) var(--cui-radius) 0 0;
}

.cui-accordion:last-of-type {
  border-radius: 0 0 var(--cui-radius) var(--cui-radius);
}

.cui-accordion:only-of-type {
  border-radius: var(--cui-radius);
}

.cui-accordion summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0.875rem 1.25rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.cui-accordion summary::after {
  content: '';
  margin-left: auto;
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--cui-muted);
  border-bottom: 2px solid var(--cui-muted);
  transform: rotate(45deg);
  transition: transform var(--cui-duration) var(--cui-easing);
}

.cui-accordion[open] summary::after {
  transform: rotate(-135deg);
}

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

.cui-accordion > :not(summary) {
  padding: 0 1.25rem 1rem;
}

/* ============================================
   TABLE
   Usage: <table class="cui-table">
   ============================================ */
.cui-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.cui-table th,
.cui-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--cui-border);
}

.cui-table th {
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cui-muted);
  background: var(--cui-surface);
}

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

/* Responsive table wrapper */
.cui-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-radius);
}

.cui-table-wrapper .cui-table {
  border: none;
}

/* ============================================
   POPOVER / TOOLTIP
   Usage: Requires JS positioning (cbrowser-ui.js)
   ============================================ */
.cui-popover {
  position: absolute;
  z-index: 900;
  width: max-content;
  max-width: 20rem;
  padding: 0.875rem 1rem;
  background: var(--cui-bg);
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-radius);
  box-shadow: 0 8px 30px -10px rgba(0, 0, 0, 0.2);
  font-size: 0.875rem;
  line-height: 1.5;
}

.cui-tooltip {
  position: absolute;
  z-index: 950;
  padding: 0.375rem 0.75rem;
  background: var(--cui-fg);
  color: var(--cui-bg);
  border-radius: calc(var(--cui-radius) * 0.75);
  font-size: 0.8125rem;
  white-space: nowrap;
  pointer-events: none;
}

/* ============================================
   BREADCRUMBS
   Usage: <nav aria-label="Breadcrumb"><ol class="cui-breadcrumb">...</ol></nav>
   ============================================ */
.cui-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  font-size: 0.875rem;
}

.cui-breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin: 0;
}

.cui-breadcrumb li + li::before {
  content: '/';
  color: var(--cui-muted);
  margin-right: 0.25rem;
}

.cui-breadcrumb a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.25rem;
  color: var(--cui-muted);
  text-decoration: none;
}

.cui-breadcrumb a:hover {
  color: var(--cui-primary);
  text-decoration: underline;
}

.cui-breadcrumb [aria-current] {
  color: var(--cui-fg);
  font-weight: 500;
}

/* ============================================
   PAGINATION
   Usage: <nav aria-label="Pagination"><ul class="cui-pagination">...</ul></nav>
   ============================================ */
.cui-pagination {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
}

.cui-pagination a,
.cui-pagination button {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.875rem;
  font-size: 0.9375rem;
  border-radius: var(--cui-radius);
  color: var(--cui-fg);
  text-decoration: none;
  border: 1px solid var(--cui-border);
  background: var(--cui-bg);
  cursor: pointer;
  transition: background var(--cui-duration) var(--cui-easing);
}

.cui-pagination a:hover,
.cui-pagination button:hover {
  background: var(--cui-surface);
}

.cui-pagination [aria-current="page"] {
  background: var(--cui-primary);
  color: var(--cui-primary-fg);
  border-color: var(--cui-primary);
}

/* ============================================
   AVATAR
   Usage: <img class="cui-avatar" src="..." alt="Name">
   ============================================ */
.cui-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 100%;
  object-fit: cover;
  border: 2px solid var(--cui-border);
}

.cui-avatar-sm { width: 2rem; height: 2rem; }
.cui-avatar-lg { width: 3.5rem; height: 3.5rem; }

/* ============================================
   SEPARATOR
   Usage: <hr class="cui-separator">
   ============================================ */
.cui-separator {
  border: none;
  height: 1px;
  background: var(--cui-border);
  margin: var(--cui-spacing) 0;
}

/* ============================================
   PROGRESS BAR
   Usage: <div class="cui-progress" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100">
   ============================================ */
.cui-progress {
  height: 0.5rem;
  background: var(--cui-surface);
  border-radius: 100px;
  overflow: hidden;
}

.cui-progress-bar {
  height: 100%;
  background: var(--cui-primary);
  border-radius: 100px;
  transition: width 300ms var(--cui-easing);
}

@media (prefers-reduced-motion: reduce) {
  .cui-progress-bar {
    transition: none;
  }
}

/* ============================================
   SKELETON LOADING
   Usage: <div class="cui-skeleton" style="height: 1rem; width: 60%"></div>
   ============================================ */
.cui-skeleton {
  background: var(--cui-surface);
  border-radius: var(--cui-radius);
  animation: cui-shimmer 2s infinite linear;
}

@keyframes cui-shimmer {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .cui-skeleton {
    animation: none;
    opacity: 0.7;
  }
}

/* ============================================
   TOAST / NOTIFICATION
   Container for JS-created toasts
   ============================================ */
.cui-toast-container {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 24rem;
}

.cui-toast {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--cui-bg);
  border: 1px solid var(--cui-border);
  border-radius: var(--cui-radius);
  box-shadow: 0 8px 30px -10px rgba(0, 0, 0, 0.2);
  font-size: 0.9375rem;
}

.cui-toast-dismiss {
  min-height: 44px;
  min-width: 44px;
  margin: -0.5rem -0.5rem -0.5rem auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--cui-muted);
  cursor: pointer;
  font-size: 1.25rem;
  border-radius: var(--cui-radius);
}

.cui-toast-dismiss:hover {
  background: var(--cui-surface);
  color: var(--cui-fg);
}

/* ============================================
   HEADER & MOBILE NAVIGATION
   Desktop: horizontal nav. Mobile: slide-out drawer.
   Usage:
     <header class="cui-header">
       <a href="/" class="cui-header-logo">Brand</a>
       <nav class="cui-header-nav" id="nav" aria-label="Main">...</nav>
       <button class="cui-header-toggle" aria-controls="nav" aria-expanded="false">☰</button>
     </header>
   Requires: cbrowser-ui.js for toggle behavior
   ============================================ */
.cui-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem var(--cui-spacing);
  border-bottom: 1px solid var(--cui-border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cui-bg);
  /* z-index creates a stacking context, but the mobile nav is portaled to <body>
     via JS when opened, so it escapes this context. */
}

.cui-header-logo {
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  color: var(--cui-fg);
  margin-right: auto;
}

.cui-header-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.cui-header-nav a,
.cui-header-nav button {
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cui-muted);
  text-decoration: none;
  border-radius: var(--cui-radius);
  display: inline-flex;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--cui-duration) var(--cui-easing),
              background var(--cui-duration) var(--cui-easing);
}

.cui-header-nav a:hover,
.cui-header-nav button:hover {
  color: var(--cui-fg);
  background: var(--cui-surface);
}

.cui-header-nav [aria-current="page"] {
  color: var(--cui-primary);
  background: color-mix(in oklch, var(--cui-primary) 8%, transparent);
}

/* Hamburger toggle — mobile only */
.cui-header-toggle {
  display: none;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--cui-fg);
  cursor: pointer;
  border-radius: var(--cui-radius);
  padding: 0.5rem;
}

.cui-header-toggle:hover {
  background: var(--cui-surface);
}

/* Mobile: hide nav, show toggle */
@media (max-width: 768px) {
  .cui-header-toggle {
    display: inline-flex;
  }

  .cui-header-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1.5rem;
    background: var(--cui-bg);
    border-left: 1px solid var(--cui-border);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 250ms var(--cui-easing), visibility 0s 250ms;
    overflow-y: auto;
  }

  .cui-header-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 250ms var(--cui-easing), visibility 0s 0s;
  }

  .cui-header-nav a,
  .cui-header-nav button {
    width: 100%;
    justify-content: flex-start;
    padding: 0.875rem 1rem;
    border-radius: var(--cui-radius);
    font-size: 1rem;
  }

  .cui-header-nav a + a {
    margin-top: 2px;
  }

}

/* Backdrop (created by JS) */
.cui-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms;
}

.cui-nav-backdrop[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .cui-header-nav {
    transition: none;
  }
}

/* ============================================
   RESPONSIVE BREAKPOINTS (as container queries)
   Usage: Apply cui-container to parent, then use @container
   ============================================ */
.cui-responsive {
  container-type: inline-size;
}

@container (max-width: 640px) {
  .cui-hide-mobile { display: none !important; }
  .cui-stack-mobile { flex-direction: column !important; }
}

@container (min-width: 641px) {
  .cui-hide-desktop { display: none !important; }
}


/**
 * cbrowser-ui — Beauty Layer
 *
 * This is what proves accessible design doesn't mean boring.
 * Subtle depth, fluid transitions, elegant spacing, vibrant-but-safe colors.
 * Every effect here respects prefers-reduced-motion.
 */

/* ============================================
   ENHANCED COLOR PALETTE
   Beautiful AND WCAG AAA compliant.
   All ratios verified: normal text ≥7:1, large text ≥4.5:1
   ============================================ */
:root {
  /* Extended palette — all AAA on white */
  --cui-blue: #1d4ed8;
  --cui-indigo: #4338ca;
  --cui-purple: #7c3aed;
  --cui-pink: #be185d;
  --cui-rose: #be123c;
  --cui-orange: #c2410c;
  --cui-amber: #92400e;
  --cui-green: #15803d;
  --cui-teal: #0f766e;
  --cui-cyan: #0e7490;

  /* Gradient stops — all maintain contrast on white text */
  --cui-gradient-start: var(--cui-primary);
  --cui-gradient-end: var(--cui-indigo);

  /* Subtle shadows with color tinting */
  --cui-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --cui-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --cui-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
  --cui-shadow-glow: 0 0 20px color-mix(in oklch, var(--cui-primary) 25%, transparent);
}

@media (prefers-color-scheme: dark) {
  :root {
    --cui-blue: #60a5fa;
    --cui-indigo: #818cf8;
    --cui-purple: #a78bfa;
    --cui-pink: #f472b6;
    --cui-rose: #fb7185;
    --cui-orange: #fb923c;
    --cui-amber: #fbbf24;
    --cui-green: #4ade80;
    --cui-teal: #2dd4bf;
    --cui-cyan: #22d3ee;

    --cui-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --cui-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --cui-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --cui-shadow-glow: 0 0 30px color-mix(in oklch, var(--cui-primary) 20%, transparent);
  }
}

/* ============================================
   DEPTH & ELEVATION
   Cards and surfaces feel layered, not flat.
   ============================================ */
.cui-card {
  box-shadow: var(--cui-shadow-sm);
  transition: box-shadow 200ms var(--cui-easing), transform 200ms var(--cui-easing);
}

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

@media (prefers-reduced-motion: no-preference) {
  .cui-card:hover {
    transform: translateY(-1px);
  }
}

/* Elevated card variant */
.cui-card-elevated {
  box-shadow: var(--cui-shadow-md);
}

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

/* ============================================
   GRADIENT ACCENTS
   Accessible gradients — text on gradient backgrounds
   always has a solid fallback.
   ============================================ */
.cui-gradient-text {
  background: linear-gradient(135deg, var(--cui-gradient-start), var(--cui-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cui-gradient-bg {
  background: linear-gradient(135deg, var(--cui-gradient-start), var(--cui-gradient-end));
  color: #fff; /* Fallback — both gradient endpoints are dark enough for white text */
}

/* Hero gradient — dramatic but accessible */
.cui-hero-gradient {
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, color-mix(in oklch, var(--cui-primary) 15%, var(--cui-bg)) 0%, var(--cui-bg) 100%);
}

@media (prefers-color-scheme: dark) {
  .cui-hero-gradient {
    background:
      radial-gradient(ellipse 80% 60% at 50% 40%, color-mix(in oklch, var(--cui-primary) 20%, var(--cui-bg)) 0%, var(--cui-bg) 100%);
  }
}

/* ============================================
   SMOOTH INTERACTIONS (motion-safe only)
   ============================================ */
@media (prefers-reduced-motion: no-preference) {
  /* Button press effect */
  .cui-btn:active,
  button:active {
    transform: scale(0.97);
  }

  /* Links get smooth color transitions */
  a {
    transition: color 150ms var(--cui-easing),
                text-decoration-color 150ms var(--cui-easing);
  }

  /* Focus ring animates in */
  *:focus-visible {
    transition: outline-offset 100ms var(--cui-easing);
    outline-offset: 3px;
  }

  /* Dialog entrance */
  .cui-dialog[open] .cui-dialog-content {
    animation: cui-dialog-in 200ms var(--cui-easing);
  }

  @keyframes cui-dialog-in {
    from { opacity: 0; transform: scale(0.95) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
  }

  /* Toast entrance */
  .cui-toast {
    animation: cui-slide-up 250ms var(--cui-easing);
  }

  @keyframes cui-slide-up {
    from { opacity: 0; transform: translateY(1rem); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* Accordion content reveal */
  .cui-accordion[open] > :not(summary) {
    animation: cui-expand 200ms var(--cui-easing);
  }

  @keyframes cui-expand {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

/* ============================================
   GLOW & EMPHASIS
   Draw attention without being distracting.
   ============================================ */
.cui-btn:focus-visible {
  box-shadow: var(--cui-shadow-glow);
}

.cui-glow {
  box-shadow: var(--cui-shadow-glow);
}

/* Highlighted card — subtle primary tint */
.cui-card-highlight {
  border-color: color-mix(in oklch, var(--cui-primary) 40%, var(--cui-border));
  box-shadow: var(--cui-shadow-sm), inset 0 1px 0 color-mix(in oklch, var(--cui-primary) 10%, transparent);
}

/* ============================================
   TYPOGRAPHY ENHANCEMENTS
   Beautiful text that's still readable.
   ============================================ */

/* Display headings — for heroes and landing pages */
.cui-display {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.cui-display-sm {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

/* Lead paragraph */
.cui-lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--cui-muted);
  max-width: 60ch;
}

/* Subtle gradient underline on links (beautiful hover) */
@media (prefers-reduced-motion: no-preference) {
  .cui-link-fancy {
    text-decoration: none;
    background-image: linear-gradient(var(--cui-primary), var(--cui-primary));
    background-position: 0% 100%;
    background-repeat: no-repeat;
    background-size: 0% 2px;
    transition: background-size 300ms var(--cui-easing);
    padding-bottom: 2px;
  }

  .cui-link-fancy:hover {
    background-size: 100% 2px;
  }
}

/* ============================================
   SECTION DIVIDERS
   Beautiful section transitions.
   ============================================ */
.cui-section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.cui-section-alt {
  background: var(--cui-surface);
}

/* Curved divider between sections */
.cui-divider-curve {
  height: 3rem;
  background: var(--cui-surface);
  clip-path: ellipse(60% 100% at 50% 100%);
}

/* ============================================
   RESPONSIVE CONTAINER WIDTHS
   ============================================ */
.cui-container-sm { max-width: 640px; }
.cui-container-md { max-width: 896px; }
.cui-container-lg { max-width: 1200px; }
.cui-container-xl { max-width: 1400px; }

/* ============================================
   PROSE (Long-form content styling)
   Beautiful reading experience.
   ============================================ */
.cui-prose {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--cui-fg);
}

.cui-prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--cui-border);
}

.cui-prose h3 {
  margin-top: 2rem;
}

.cui-prose p + p {
  margin-top: 1.25rem;
}

.cui-prose img {
  border-radius: var(--cui-radius);
  box-shadow: var(--cui-shadow-md);
  margin: 2rem 0;
}

.cui-prose blockquote {
  border-left: 4px solid var(--cui-primary);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--cui-surface);
  border-radius: 0 var(--cui-radius) var(--cui-radius) 0;
  font-style: italic;
}

.cui-prose code {
  font-size: 0.85em;
  padding: 0.2em 0.4em;
  background: var(--cui-surface);
  border-radius: 4px;
  font-family: var(--cui-font-mono);
}

.cui-prose pre {
  margin: 1.5rem 0;
  padding: 1.25rem;
  background: var(--cui-surface);
  border-radius: var(--cui-radius);
  border: 1px solid var(--cui-border);
  overflow-x: auto;
}

.cui-prose pre code {
  padding: 0;
  background: none;
  font-size: 0.875rem;
}

.cui-prose ul, .cui-prose ol {
  padding-left: 1.5rem;
}

.cui-prose li {
  margin: 0.5rem 0;
}

.cui-prose a {
  color: var(--cui-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}