/**
 * Chattu — shared UX across all HTML surfaces.
 * Load after: app-tokens.css (required). Optional: page-specific CSS last.
 */
html.chattu {
  -webkit-text-size-adjust: 100%;
}

html.chattu,
html.chattu body {
  font-family: var(--font-sans);
}

html.chattu :focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

html.chattu ::selection {
  background: rgba(37, 211, 102, 0.28);
}

html.chattu.chattu-light body {
  color: var(--text-primary);
}

/* —— Error pages (dark app tokens) —— */
body.chattu-error-page {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  box-sizing: border-box;
  background: var(--bg-app) !important;
  color: var(--text-primary) !important;
  font-family: var(--font-sans) !important;
}

.chattu-error-inner {
  text-align: center;
  max-width: 36rem;
}

.chattu-error-brand {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.chattu-error-code {
  font-size: clamp(3.5rem, 12vw, 5.5rem);
  font-weight: 800;
  line-height: 1;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.chattu-error-code.chattu-error-code-warn {
  background: linear-gradient(135deg, #fbbf24, #f97316);
  -webkit-background-clip: text;
  background-clip: text;
}

.chattu-error-heading {
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--text-primary);
}

.chattu-error-desc {
  font-size: 1.05rem;
  line-height: 1.55;
  margin: 0 0 1.75rem;
  color: var(--text-secondary);
}

.chattu-error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.chattu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.35rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  font-family: inherit;
}

.chattu-btn-primary {
  background: var(--accent);
  color: #042f1f;
  box-shadow: var(--shadow-md);
}

.chattu-btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  filter: brightness(1.05);
}

.chattu-btn-outline {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.chattu-btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Error page language selector (dark bg) */
body.chattu-error-page .language-selector {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 1000;
}

body.chattu-error-page .lang-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  font-family: inherit;
}

body.chattu-error-page .lang-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(37, 211, 102, 0.4);
}

body.chattu-error-page .lang-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 10rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  overflow: hidden;
}

body.chattu-error-page .lang-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

body.chattu-error-page .lang-option {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}

body.chattu-error-page .lang-option:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

body.chattu-error-page .lang-option.active {
  background: var(--accent-muted);
  color: var(--accent);
  font-weight: 600;
}

[dir="rtl"] body.chattu-error-page .language-selector {
  right: auto;
  left: 1.25rem;
}

[dir="rtl"] body.chattu-error-page .lang-dropdown {
  right: auto;
  left: 0;
}

@media (max-width: 576px) {
  body.chattu-error-page.rtl .language-selector,
  [dir="rtl"] body.chattu-error-page .language-selector {
    top: 0.625rem;
    left: 0.625rem;
    right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html.chattu :focus-visible {
    transition: none;
  }
}