/**
 * BI-Chat UI Styles
 * Comprehensive CSS variable system for theming and customization
 */

/* =============================================================================
   CSS Variables - Design Tokens
   ============================================================================= */

:root,
:host {
  /* -------------------------------------------------------------------------
     Spacing Scale
     ------------------------------------------------------------------------- */
  --bichat-spacing-0: 0;
  --bichat-spacing-px: 1px;
  --bichat-spacing-0_5: 0.125rem;
  --bichat-spacing-1: 0.25rem;
  --bichat-spacing-1_5: 0.375rem;
  --bichat-spacing-2: 0.5rem;
  --bichat-spacing-2_5: 0.625rem;
  --bichat-spacing-3: 0.75rem;
  --bichat-spacing-3_5: 0.875rem;
  --bichat-spacing-4: 1rem;
  --bichat-spacing-5: 1.25rem;
  --bichat-spacing-6: 1.5rem;
  --bichat-spacing-7: 1.75rem;
  --bichat-spacing-8: 2rem;
  --bichat-spacing-9: 2.25rem;
  --bichat-spacing-10: 2.5rem;
  --bichat-spacing-12: 3rem;
  --bichat-spacing-14: 3.5rem;
  --bichat-spacing-16: 4rem;

  /* Semantic spacing aliases */
  --bichat-spacing-xs: var(--bichat-spacing-1);
  --bichat-spacing-sm: var(--bichat-spacing-2);
  --bichat-spacing-md: var(--bichat-spacing-4);
  --bichat-spacing-lg: var(--bichat-spacing-6);
  --bichat-spacing-xl: var(--bichat-spacing-8);
  --bichat-spacing-2xl: var(--bichat-spacing-12);

  /* -------------------------------------------------------------------------
     Color Palette - Gray Scale
     ------------------------------------------------------------------------- */
  --bichat-color-gray-50: #f9fafb;
  --bichat-color-gray-100: #f3f4f6;
  --bichat-color-gray-200: #e5e7eb;
  --bichat-color-gray-300: #d1d5db;
  --bichat-color-gray-400: #9ca3af;
  --bichat-color-gray-500: #6b7280;
  --bichat-color-gray-600: #4b5563;
  --bichat-color-gray-700: #374151;
  --bichat-color-gray-800: #1f2937;
  --bichat-color-gray-900: #111827;
  --bichat-color-gray-950: #030712;

  /* -------------------------------------------------------------------------
     Color Palette - Primary (Blue)
     ------------------------------------------------------------------------- */
  --bichat-color-primary-50: #eff6ff;
  --bichat-color-primary-100: #dbeafe;
  --bichat-color-primary-200: #bfdbfe;
  --bichat-color-primary-300: #93c5fd;
  --bichat-color-primary-400: #60a5fa;
  --bichat-color-primary-500: #3b82f6;
  --bichat-color-primary-600: #2563eb;
  --bichat-color-primary-700: #1d4ed8;
  --bichat-color-primary-800: #1e40af;
  --bichat-color-primary-900: #1e3a8a;
  --bichat-color-primary-950: #172554;

  /* -------------------------------------------------------------------------
     Color Palette - Semantic Colors
     ------------------------------------------------------------------------- */
  --bichat-color-success-50: #f0fdf4;
  --bichat-color-success-500: #22c55e;
  --bichat-color-success-600: #16a34a;
  --bichat-color-success-700: #15803d;

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

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

  --bichat-color-info-50: #eff6ff;
  --bichat-color-info-500: #3b82f6;
  --bichat-color-info-600: #2563eb;
  --bichat-color-info-700: #1d4ed8;

  /* -------------------------------------------------------------------------
     Semantic Color Tokens (Light Mode)
     ------------------------------------------------------------------------- */
  --bichat-color-bg: var(--bichat-color-gray-50);
  --bichat-color-bg-subtle: var(--bichat-color-gray-100);
  --bichat-color-bg-muted: var(--bichat-color-gray-200);

  --bichat-color-surface: #ffffff;
  --bichat-color-surface-raised: #ffffff;
  --bichat-color-surface-overlay: rgba(255, 255, 255, 0.9);

  --bichat-color-text: var(--bichat-color-gray-900);
  --bichat-color-text-secondary: var(--bichat-color-gray-600);
  --bichat-color-text-muted: var(--bichat-color-gray-500);
  --bichat-color-text-disabled: var(--bichat-color-gray-400);
  --bichat-color-text-inverse: #ffffff;
  --bichat-color-code-text: var(--bichat-color-gray-800);
  --bichat-color-code-bg: var(--bichat-color-gray-100);
  --bichat-color-text-icon: var(--bichat-color-gray-500);

  --bichat-color-border: var(--bichat-color-gray-200);
  --bichat-color-border-subtle: var(--bichat-color-gray-100);
  --bichat-color-border-strong: var(--bichat-color-gray-300);

  --bichat-color-accent: var(--bichat-color-primary-600);
  --bichat-color-accent-hover: var(--bichat-color-primary-700);
  --bichat-color-accent-muted: var(--bichat-color-primary-100);

  /* Chat-specific semantic tokens */
  --bichat-color-user-bubble-bg: var(--bichat-color-primary-600);
  --bichat-color-user-bubble-text: #ffffff;
  --bichat-color-user-bubble-border: transparent;

  --bichat-color-assistant-bubble-bg: var(--bichat-color-surface);
  --bichat-color-assistant-bubble-text: var(--bichat-color-text);
  --bichat-color-assistant-bubble-border: var(--bichat-color-border);

  --bichat-color-system-bubble-bg: var(--bichat-color-bg-subtle);
  --bichat-color-system-bubble-text: var(--bichat-color-text-secondary);

  --bichat-color-input-bg: var(--bichat-color-surface);
  --bichat-color-input-text: var(--bichat-color-text);
  --bichat-color-input-border: var(--bichat-color-border);
  --bichat-color-input-focus-border: var(--bichat-color-accent);
  --bichat-color-input-placeholder: var(--bichat-color-text-muted);

  /* -------------------------------------------------------------------------
     Typography
     ------------------------------------------------------------------------- */
  --bichat-font-family: 'Gilroy', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans',
    'Helvetica Neue', sans-serif;
  --bichat-font-family-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo,
    Consolas, 'Liberation Mono', monospace;

  --bichat-font-size-xs: 0.75rem;
  --bichat-font-size-sm: 0.875rem;
  --bichat-font-size-base: 1rem;
  --bichat-font-size-lg: 1.125rem;
  --bichat-font-size-xl: 1.25rem;
  --bichat-font-size-2xl: 1.5rem;
  --bichat-font-size-3xl: 1.875rem;

  --bichat-font-weight-normal: 400;
  --bichat-font-weight-medium: 500;
  --bichat-font-weight-semibold: 600;
  --bichat-font-weight-bold: 700;

  --bichat-line-height-tight: 1.25;
  --bichat-line-height-normal: 1.5;
  --bichat-line-height-relaxed: 1.625;

  --bichat-letter-spacing-tight: -0.025em;
  --bichat-letter-spacing-normal: 0;
  --bichat-letter-spacing-wide: 0.025em;

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

  /* Semantic radius aliases */
  --bichat-radius-bubble: var(--bichat-radius-2xl);
  --bichat-radius-bubble-tail: var(--bichat-radius-sm);
  --bichat-radius-button: var(--bichat-radius-lg);
  --bichat-radius-input: var(--bichat-radius-lg);
  --bichat-radius-card: var(--bichat-radius-xl);
  --bichat-radius-modal: var(--bichat-radius-2xl);

  /* -------------------------------------------------------------------------
     Shadows
     ------------------------------------------------------------------------- */
  --bichat-shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --bichat-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --bichat-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --bichat-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --bichat-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --bichat-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --bichat-shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
  --bichat-shadow-none: 0 0 #0000;

  /* Focus ring (WCAG 2.4.7 Focus Visible - high contrast for keyboard users) */
  --bichat-ring-width: 2px;
  --bichat-ring-offset: 2px;
  --bichat-ring-color: var(--bichat-color-primary-500);
  --bichat-focus-ring: 0 0 0 var(--bichat-ring-width) var(--bichat-ring-color);
  --bichat-focus-ring-offset: 0 0 0 var(--bichat-ring-offset) var(--bichat-color-surface);

  /* -------------------------------------------------------------------------
     Transitions & Animation
     ------------------------------------------------------------------------- */
  --bichat-transition-fast: 100ms;
  --bichat-transition-normal: 150ms;
  --bichat-transition-slow: 200ms;
  --bichat-transition-slower: 300ms;

  --bichat-ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --bichat-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --bichat-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --bichat-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --bichat-ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* -------------------------------------------------------------------------
     Z-Index Scale
     ------------------------------------------------------------------------- */
  --bichat-z-base: 0;
  --bichat-z-dropdown: 10;
  --bichat-z-sticky: 20;
  --bichat-z-overlay: 30;
  --bichat-z-modal: 40;
  --bichat-z-popover: 50;
  --bichat-z-toast: 60;
  --bichat-z-tooltip: 70;

  /* -------------------------------------------------------------------------
     Component-Specific Sizes
     ------------------------------------------------------------------------- */
  --bichat-avatar-size-sm: 1.5rem;
  --bichat-avatar-size-md: 2rem;
  --bichat-avatar-size-lg: 2.5rem;
  --bichat-avatar-size-xl: 3rem;

  --bichat-bubble-max-width: 75%;
  --bichat-bubble-assistant-max-width: 85%;

  --bichat-input-min-height: 2.5rem;
  --bichat-input-max-height: 12rem;

  --bichat-color-chart-grid: rgba(148, 163, 184, 0.15);

  /* Legacy compatibility (keep for backward compat) */
  --bichat-primary: var(--bichat-color-primary-500);
  --bichat-bg: var(--bichat-color-bg);
  --bichat-text: var(--bichat-color-text);
  --bichat-border: var(--bichat-color-border);
  --bichat-bubble-user: var(--bichat-color-user-bubble-bg);
  --bichat-bubble-assistant: var(--bichat-color-assistant-bubble-bg);
}

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

/* Class-based dark mode (for Tailwind .dark class) */
.dark,
[data-theme="dark"] {
  --bichat-color-bg: var(--bichat-color-gray-900);
  --bichat-color-bg-subtle: var(--bichat-color-gray-800);
  --bichat-color-bg-muted: var(--bichat-color-gray-700);

  --bichat-color-surface: var(--bichat-color-gray-800);
  --bichat-color-surface-raised: var(--bichat-color-gray-750, #2d3748);
  --bichat-color-surface-overlay: rgba(31, 41, 55, 0.9);

  --bichat-color-text: var(--bichat-color-gray-100);
  --bichat-color-text-secondary: var(--bichat-color-gray-300);
  --bichat-color-text-muted: var(--bichat-color-gray-400);
  --bichat-color-text-disabled: var(--bichat-color-gray-500);
  --bichat-color-code-text: var(--bichat-color-gray-200);
  --bichat-color-code-bg: var(--bichat-color-gray-800);
  --bichat-color-text-icon: var(--bichat-color-gray-400);

  --bichat-color-border: var(--bichat-color-gray-700);
  --bichat-color-border-subtle: var(--bichat-color-gray-800);
  --bichat-color-border-strong: var(--bichat-color-gray-600);

  --bichat-color-accent-muted: var(--bichat-color-primary-900);

  /* Chat-specific dark mode */
  --bichat-color-user-bubble-bg: var(--bichat-color-primary-700);
  --bichat-color-assistant-bubble-bg: var(--bichat-color-gray-800);
  --bichat-color-assistant-bubble-border: var(--bichat-color-gray-700);
  --bichat-color-system-bubble-bg: var(--bichat-color-gray-800);

  --bichat-color-input-bg: var(--bichat-color-gray-800);
  --bichat-color-input-border: var(--bichat-color-gray-700);

  /* Legacy compatibility */
  --bichat-bg: var(--bichat-color-bg);
  --bichat-text: var(--bichat-color-text);
  --bichat-border: var(--bichat-color-border);
  --bichat-bubble-assistant: var(--bichat-color-assistant-bubble-bg);

  --bichat-color-chart-grid: rgba(148, 163, 184, 0.1);

  /* Adjust shadows for dark mode */
  --bichat-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
  --bichat-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --bichat-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
}

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

.bichat-session {
  background-color: var(--bichat-color-bg);
  color: var(--bichat-color-text);
  font-family: var(--bichat-font-family);
  font-size: var(--bichat-font-size-base);
  line-height: var(--bichat-line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Buttons and button-like elements: pointer cursor; disabled: not-allowed
   :host is required when styles are injected into the applet shadow root (bi-chat-root) */
:host button,
:host [role="button"],
:host [role="tab"],
.bichat-session button,
.bichat-session [role="button"],
.bichat-session [role="tab"],
bi-chat-root button,
bi-chat-root [role="button"],
bi-chat-root [role="tab"] {
  cursor: pointer;
}
:host button:disabled,
:host [role="button"][aria-disabled="true"],
.bichat-session button:disabled,
.bichat-session [role="button"][aria-disabled="true"],
bi-chat-root button:disabled,
bi-chat-root [role="button"][aria-disabled="true"] {
  cursor: not-allowed;
}

/* Focus visible: high-contrast focus rings for keyboard navigation (WCAG 2.4.7) */
.bichat-session button:focus-visible,
.bichat-session a:focus-visible,
.bichat-session input:focus-visible,
.bichat-session textarea:focus-visible,
.bichat-session [role="button"]:focus-visible,
.bichat-session [role="menuitem"]:focus-visible,
.bichat-session [role="tab"]:focus-visible,
.bichat-session select:focus-visible,
.bichat-session [tabindex]:not([tabindex="-1"]):focus-visible,
bi-chat-root button:focus-visible,
bi-chat-root a:focus-visible,
bi-chat-root input:focus-visible,
bi-chat-root textarea:focus-visible,
bi-chat-root [role="button"]:focus-visible,
bi-chat-root [role="menuitem"]:focus-visible,
bi-chat-root [role="tab"]:focus-visible,
bi-chat-root select:focus-visible,
bi-chat-root [tabindex]:not([tabindex="-1"]):focus-visible {
  outline: none;
  box-shadow: var(--bichat-focus-ring-offset), var(--bichat-focus-ring);
  border-radius: inherit;
}

.dark .bichat-session button:focus-visible,
.dark .bichat-session a:focus-visible,
.dark .bichat-session input:focus-visible,
.dark .bichat-session textarea:focus-visible,
.dark .bichat-session [role="button"]:focus-visible,
.dark .bichat-session [role="menuitem"]:focus-visible,
.dark .bichat-session [role="tab"]:focus-visible,
.dark .bichat-session select:focus-visible,
.dark .bichat-session [tabindex]:not([tabindex="-1"]):focus-visible,
.dark bi-chat-root button:focus-visible,
.dark bi-chat-root a:focus-visible,
.dark bi-chat-root input:focus-visible,
.dark bi-chat-root textarea:focus-visible,
.dark bi-chat-root [role="button"]:focus-visible,
.dark bi-chat-root [role="menuitem"]:focus-visible,
.dark bi-chat-root [role="tab"]:focus-visible,
.dark bi-chat-root select:focus-visible,
.dark bi-chat-root [tabindex]:not([tabindex="-1"]):focus-visible {
  --bichat-focus-ring: 0 0 0 var(--bichat-ring-width) var(--bichat-color-primary-400);
}

/* =============================================================================
   Scrollbar Styles
   ============================================================================= */

.bichat-messages::-webkit-scrollbar {
  width: 8px;
}

.bichat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.bichat-messages::-webkit-scrollbar-thumb {
  background: var(--bichat-color-gray-300);
  border-radius: var(--bichat-radius-full);
}

.bichat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--bichat-color-gray-400);
}

.dark .bichat-messages::-webkit-scrollbar-thumb {
  background: var(--bichat-color-gray-600);
}

.dark .bichat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--bichat-color-gray-500);
}

/* =============================================================================
   Animations
   ============================================================================= */

@keyframes bichat-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

@keyframes bichat-bounce {
  0%, 100% {
    transform: translateY(0);
    animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
  }
  50% {
    transform: translateY(-25%);
    animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
  }
}

@keyframes bichat-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes bichat-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

.animate-pulse {
  animation: bichat-pulse 1s var(--bichat-ease-in-out) infinite;
}

.animate-bounce {
  animation: bichat-bounce 1s infinite;
}

.animate-spin {
  animation: bichat-spin 1s linear infinite;
}

.animate-fade-in {
  animation: bichat-fade-in var(--bichat-transition-normal) var(--bichat-ease-out);
}

.animate-slide-up {
  animation: bichat-slide-up var(--bichat-transition-slow) var(--bichat-ease-out);
}

/* =============================================================================
   Thinking Shimmer Animation
   ============================================================================= */

.bichat-thinking-shimmer {
  -webkit-mask-image: linear-gradient(
    -45deg,
    rgba(0, 0, 0, 1) 20%,
    rgba(0, 0, 0, 1) 40%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 1) 60%,
    rgba(0, 0, 0, 1) 80%
  );
  mask-image: linear-gradient(
    -45deg,
    rgba(0, 0, 0, 1) 20%,
    rgba(0, 0, 0, 1) 40%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 1) 60%,
    rgba(0, 0, 0, 1) 80%
  );
  -webkit-mask-size: 300% 100%;
  mask-size: 300% 100%;
  animation: bichat-thinking-shimmer 4.5s linear infinite;
}

.dark .bichat-thinking-shimmer {
  -webkit-mask-image: linear-gradient(
    -45deg,
    rgba(0, 0, 0, 1) 15%,
    rgba(0, 0, 0, 1) 35%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 1) 65%,
    rgba(0, 0, 0, 1) 85%
  );
  mask-image: linear-gradient(
    -45deg,
    rgba(0, 0, 0, 1) 15%,
    rgba(0, 0, 0, 1) 35%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 1) 65%,
    rgba(0, 0, 0, 1) 85%
  );
}

@keyframes bichat-toast-progress {
  from { transform: scaleX(1); }
  to { transform: scaleX(0); }
}

@media (prefers-reduced-motion: reduce) {
  .bichat-thinking-shimmer,
  .animate-pulse,
  .animate-bounce,
  .animate-spin,
  .animate-fade-in,
  .animate-slide-up {
    animation: none;
  }
}

@keyframes bichat-thinking-shimmer {
  0% { -webkit-mask-position: 130% 0; mask-position: 130% 0; }
  100% { -webkit-mask-position: -30% 0; mask-position: -30% 0; }
}

/* =============================================================================
   Prose / Markdown Styles
   ============================================================================= */

.prose {
  color: var(--bichat-color-text);
  font-size: var(--bichat-font-size-base);
  line-height: var(--bichat-line-height-relaxed);
}

.prose > :first-child {
  margin-top: 0;
}

.prose > :last-child {
  margin-bottom: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  color: var(--bichat-color-text);
  font-weight: var(--bichat-font-weight-semibold);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  line-height: var(--bichat-line-height-tight);
}

.prose h1 {
  font-size: 1.625rem;
  font-weight: var(--bichat-font-weight-bold);
}

.prose h2 {
  font-size: 1.375rem;
  margin-top: 2em;
}

.prose h3 {
  font-size: var(--bichat-font-size-lg);
  font-weight: var(--bichat-font-weight-semibold);
}

.prose h4 { font-size: var(--bichat-font-size-base); }

.prose > * + h2 {
  margin-top: 2em;
}

.prose p {
  margin-top: 0.75em;
  margin-bottom: 0.75em;
}

.prose strong {
  font-weight: var(--bichat-font-weight-semibold);
  color: var(--bichat-color-text);
}

.prose code {
  background-color: var(--bichat-color-code-bg);
  color: var(--bichat-color-code-text);
  padding: 0.2em 0.5em;
  border-radius: var(--bichat-radius-md);
  border: 1px solid var(--bichat-color-border-subtle);
  font-family: var(--bichat-font-family-mono);
  font-size: 0.875em;
}

.prose pre {
  background-color: var(--bichat-color-code-bg);
  color: var(--bichat-color-gray-100);
  padding: var(--bichat-spacing-4);
  border-radius: var(--bichat-radius-lg);
  overflow-x: auto;
  margin-top: 1em;
  margin-bottom: 1em;
  font-family: var(--bichat-font-family-mono);
  font-size: var(--bichat-font-size-sm);
  line-height: var(--bichat-line-height-relaxed);
}

.prose pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
  border-radius: 0;
  border: none;
}

.prose a {
  color: var(--bichat-color-accent);
  text-decoration: none;
  font-weight: var(--bichat-font-weight-medium);
}

.prose a:hover {
  text-decoration: underline;
}

.prose ul,
.prose ol {
  margin-top: 0.75em;
  margin-bottom: 0.75em;
  padding-left: 1.5em;
}

.prose ul {
  list-style-type: disc;
}

.prose ol {
  list-style-type: decimal;
}

.prose li {
  margin-top: 0.25em;
  margin-bottom: 0.25em;
}

.prose li > ul,
.prose li > ol {
  margin-top: 0.25em;
  margin-bottom: 0.25em;
}

.prose blockquote {
  border-left: 4px solid var(--bichat-color-border-strong);
  padding-left: var(--bichat-spacing-4);
  margin-left: 0;
  font-style: italic;
  color: var(--bichat-color-text-secondary);
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--bichat-color-border);
  margin: 2em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1em;
  margin-bottom: 1em;
  font-size: var(--bichat-font-size-sm);
}

.prose th,
.prose td {
  border: 1px solid var(--bichat-color-border);
  padding: var(--bichat-spacing-2) var(--bichat-spacing-3);
  text-align: left;
}

.prose th {
  background-color: var(--bichat-color-bg-subtle);
  font-weight: var(--bichat-font-weight-semibold);
}

.prose tbody tr:nth-child(even) {
  background-color: var(--bichat-color-bg-subtle);
}

/* Keep rendered formulas readable within chat bubbles. */
.markdown-content math[display='block'] {
  display: block;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}

/* =============================================================================
   Focus Styles
   ============================================================================= */

.bichat-focus-ring:focus-visible {
  outline: none;
  box-shadow: 0 0 0 var(--bichat-ring-offset) var(--bichat-color-bg),
    0 0 0 calc(var(--bichat-ring-offset) + var(--bichat-ring-width)) var(--bichat-ring-color);
}

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

.bichat-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;
}