@import 'tailwindcss';
@plugin '@tailwindcss/typography';
@import 'tw-shimmer';
@import 'katex/dist/katex.min.css';
@import '@vscode/codicons/dist/codicon.css';
@custom-variant dark (&:is(.dark *));

@font-face {
  font-family: 'Collapse';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../../../node_modules/@nous-research/ui/dist/fonts/Collapse-Bold.woff2') format('woff2');
}

@theme inline {
  --color-background: var(--dt-background);
  --color-foreground: var(--dt-foreground);
  --color-card: var(--dt-card);
  --color-card-foreground: var(--dt-card-foreground);
  --color-muted: var(--dt-muted);
  --color-muted-foreground: var(--dt-muted-foreground);
  --color-popover: var(--dt-popover);
  --color-popover-foreground: var(--dt-popover-foreground);
  --color-primary: var(--dt-primary);
  --color-primary-foreground: var(--dt-primary-foreground);
  --color-secondary: var(--dt-secondary);
  --color-secondary-foreground: var(--dt-secondary-foreground);
  --color-accent: var(--dt-accent);
  --color-accent-foreground: var(--dt-accent-foreground);
  --color-border: var(--dt-border);
  --color-input: var(--dt-input);
  --color-ring: var(--dt-ring);
  --color-destructive: var(--dt-destructive);
  --color-destructive-foreground: var(--dt-destructive-foreground);

  --color-midground: var(--dt-midground);
  --color-midground-foreground: var(--dt-midground-foreground);

  --font-sans: var(--dt-font-sans);
  --font-mono: var(--dt-font-mono);

  --spacing-mul: var(--dt-spacing-mul, 1);

  --radius-xs: calc(var(--radius-scalar) * 0.125rem);
  --radius-sm: calc(var(--radius-scalar) * 0.5rem);
  --radius-md: calc(var(--radius-scalar) * 0.625rem);
  --radius-lg: calc(var(--radius-scalar) * 0.75rem);
  --radius-xl: calc(var(--radius-scalar) * 1rem);
  --radius-2xl: calc(var(--radius-scalar) * 1.5rem);
  --radius-3xl: calc(var(--radius-scalar) * 2rem);
  --radius-4xl: calc(var(--radius-scalar) * 2.5rem);

  --color-sidebar-ring: var(--sidebar-ring);
  --color-sidebar-border: var(--sidebar-border);
  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
  --color-sidebar-accent: var(--sidebar-accent);
  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
  --color-sidebar-primary: var(--sidebar-primary);
  --color-sidebar-foreground: var(--sidebar-foreground);
  --color-sidebar: var(--sidebar);

  --shadow-ink: var(--dt-foreground);
  --shadow-xs: 0 0.0625rem 0.125rem color-mix(in srgb, #000 5%, transparent);
  --shadow-sm:
    0 0 0 0.0625rem color-mix(in srgb, var(--dt-foreground) 6%, transparent),
    0 0.125rem 0.5rem color-mix(in srgb, #000 4%, transparent);
  --shadow-md:
    0 0 0 0.0625rem color-mix(in srgb, var(--dt-foreground) 8%, transparent),
    0 0.25rem 1rem color-mix(in srgb, #000 8%, transparent),
    0 1rem 2rem -1.5rem color-mix(in srgb, #000 18%, transparent);
  --shadow-lg:
    inset 0 0.0625rem 0 color-mix(in srgb, #fff 28%, transparent),
    0 0 0 0.0625rem color-mix(in srgb, var(--dt-foreground) 8%, transparent),
    0 0.75rem 2rem color-mix(in srgb, #000 12%, transparent);
  --shadow-header:
    0 0.0625rem 0 color-mix(in srgb, var(--dt-foreground) 7%, transparent),
    0 0.625rem 1.5rem -1.25rem color-mix(in srgb, #000 16%, transparent);
  --shadow-composer: 0 0.0625rem 0.125rem color-mix(in srgb, #000 5%, transparent);
  --shadow-composer-focus:
    0 0 0 0.125rem color-mix(in srgb, var(--dt-composer-ring) calc(10% * var(--composer-ring-strength)), transparent),
    0 0 0 0.0625rem color-mix(in srgb, var(--dt-composer-ring) calc(22% * var(--composer-ring-strength)), transparent),
    0 0.25rem 0.875rem color-mix(in srgb, #000 8%, transparent),
    0 0.75rem 2rem -1.25rem color-mix(in srgb, #000 14%, transparent);
}

@layer base {
  :root {
    color-scheme: light;

    --theme-foreground: #17171a;
    --theme-primary: #0053fd;
    --theme-secondary: color-mix(in srgb, #0053fd 7%, #ffffff);
    --theme-accent-soft: color-mix(in srgb, #0053fd 10%, #ffffff);
    --theme-midground: #0053fd;
    --theme-warm: #cf806d;
    --theme-background-seed: #f8faff;
    --theme-sidebar-seed: #f3f7ff;
    --theme-card-seed: #ffffff;
    --theme-elevated-seed: #ffffff;
    --theme-bubble-seed: color-mix(in srgb, #0053fd 6%, #ffffff);
    --theme-neutral-chrome: #f3f3f3;
    --theme-neutral-sidebar: #f3f3f3;
    --theme-neutral-card: #fcfcfc;
    --theme-mix-chrome: 92%;
    --theme-mix-sidebar: 100%;
    --theme-mix-card: 22%;
    --theme-mix-elevated: 28%;
    --theme-mix-bubble: 0%;
    --theme-fill-primary-accent-mix: 16%;
    --theme-fill-secondary-accent-mix: 11%;
    --theme-fill-tertiary-accent-mix: 8%;
    --theme-fill-quaternary-accent-mix: 5%;
    --theme-fill-quinary-accent-mix: 3%;
    --theme-stroke-primary-accent-mix: 24%;
    --theme-stroke-secondary-accent-mix: 16%;
    --theme-stroke-tertiary-accent-mix: 10%;
    --theme-stroke-quaternary-accent-mix: 6%;
    --theme-row-hover-accent-mix: 4%;
    --theme-row-active-accent-mix: 8%;
    --theme-control-hover-accent-mix: 6%;
    --theme-control-active-accent-mix: 8%;

    --ui-base: var(--theme-foreground);
    --ui-accent: var(--theme-midground);
    --ui-accent-secondary: var(--theme-primary);
    --ui-warm: var(--theme-warm);
    --ui-red: #cf2d56;
    --ui-orange: #db704b;
    --ui-yellow: #c08532;
    --ui-green: #1f8a65;
    --ui-cyan: #4c7f8c;
    --ui-blue: #0053fd;
    --ui-purple: #9e94d5;
    --ui-bg-chrome: color-mix(
      in srgb,
      var(--theme-background-seed) var(--theme-mix-chrome),
      var(--theme-neutral-chrome)
    );
    --ui-bg-sidebar: color-mix(
      in srgb,
      var(--theme-sidebar-seed) var(--theme-mix-sidebar),
      var(--theme-neutral-sidebar)
    );
    --ui-bg-editor: color-mix(in srgb, var(--theme-card-seed) var(--theme-mix-card), var(--theme-neutral-card));
    --ui-bg-elevated: color-mix(
      in srgb,
      var(--theme-elevated-seed) var(--theme-mix-elevated),
      var(--theme-neutral-card)
    );
    --ui-bg-card: color-mix(in srgb, var(--ui-accent) 4%, color-mix(in srgb, var(--ui-base) 4%, transparent));
    --ui-bg-input: #fcfcfc;
    --ui-bg-primary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-fill-primary-accent-mix),
      color-mix(in srgb, var(--ui-base) 10%, transparent)
    );
    --ui-bg-secondary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-fill-secondary-accent-mix),
      color-mix(in srgb, var(--ui-base) 7%, transparent)
    );
    --ui-bg-tertiary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-fill-tertiary-accent-mix),
      color-mix(in srgb, var(--ui-base) 5%, transparent)
    );
    --ui-bg-quaternary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-fill-quaternary-accent-mix),
      color-mix(in srgb, var(--ui-base) 4%, transparent)
    );
    --ui-bg-quinary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-fill-quinary-accent-mix),
      color-mix(in srgb, var(--ui-base) 3%, transparent)
    );
    --ui-row-hover-background: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-row-hover-accent-mix),
      color-mix(in srgb, var(--ui-base) 3%, transparent)
    );
    --ui-row-active-background: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-row-active-accent-mix),
      color-mix(in srgb, var(--ui-base) 5%, transparent)
    );
    --ui-control-hover-background: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-control-hover-accent-mix),
      color-mix(in srgb, var(--ui-base) 4%, transparent)
    );
    --ui-control-active-background: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-control-active-accent-mix),
      color-mix(in srgb, var(--ui-base) 5%, transparent)
    );
    --ui-text-primary: color-mix(in srgb, var(--ui-base) 94%, transparent);
    --ui-text-secondary: color-mix(in srgb, var(--ui-base) 74%, transparent);
    --ui-text-tertiary: color-mix(in srgb, var(--ui-base) 54%, transparent);
    --ui-text-quaternary: color-mix(in srgb, var(--ui-base) 36%, transparent);
    --ui-stroke-primary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-stroke-primary-accent-mix),
      color-mix(in srgb, var(--ui-base) 10%, transparent)
    );
    --ui-stroke-secondary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-stroke-secondary-accent-mix),
      color-mix(in srgb, var(--ui-base) 7%, transparent)
    );
    --ui-stroke-tertiary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-stroke-tertiary-accent-mix),
      color-mix(in srgb, var(--ui-base) 5%, transparent)
    );
    --ui-stroke-quaternary: color-mix(
      in srgb,
      var(--ui-accent) var(--theme-stroke-quaternary-accent-mix),
      color-mix(in srgb, var(--ui-base) 3%, transparent)
    );
    --ui-sash-hover-border: color-mix(in srgb, var(--ui-accent) 18%, var(--ui-stroke-tertiary));
    --ui-sash-hover-background: color-mix(in srgb, var(--ui-accent) 6%, transparent);
    --ui-surface-background: var(--ui-bg-editor);
    --ui-sidebar-surface-background: var(--ui-bg-sidebar);
    --ui-chat-surface-background: var(--ui-bg-chrome);
    --ui-editor-surface-background: var(--ui-bg-chrome);
    --ui-chat-bubble-background: color-mix(
      in srgb,
      var(--theme-bubble-seed) var(--theme-mix-bubble),
      var(--theme-neutral-card)
    );
    --ui-chat-bubble-opaque-background: var(--ui-bg-editor);
    --ui-inline-code-background: color-mix(in srgb, #141414 5%, transparent);
    --ui-inline-code-border: color-mix(in srgb, #141414 8%, transparent);
    --ui-inline-code-foreground: color-mix(in srgb, #141414 88%, transparent);
    --ui-selection-background: color-mix(in srgb, #ffd24a 55%, transparent);

    --dt-background: var(--ui-bg-chrome);
    --dt-foreground: var(--ui-text-primary);
    --dt-card: var(--ui-bg-editor);
    --dt-card-foreground: var(--ui-text-primary);
    --dt-muted: var(--ui-bg-tertiary);
    --dt-muted-foreground: var(--ui-text-tertiary);
    --dt-popover: color-mix(in srgb, var(--ui-bg-elevated) 96%, transparent);
    --dt-popover-foreground: var(--ui-text-primary);
    --dt-primary: var(--theme-primary);
    --dt-primary-foreground: #fcfcfc;
    --dt-secondary: var(--theme-secondary);
    --dt-secondary-foreground: var(--ui-text-secondary);
    --dt-accent: var(--theme-accent-soft);
    --dt-accent-foreground: var(--ui-text-primary);
    --dt-border: var(--ui-stroke-secondary);
    --dt-input: var(--ui-stroke-primary);
    --dt-ring: var(--ui-stroke-primary);
    --dt-midground: var(--theme-midground);
    --dt-composer-ring: var(--ui-base);
    --dt-destructive: #cf2d56;
    --dt-destructive-foreground: #ffffff;
    --dt-sidebar-bg: var(--ui-bg-sidebar);
    --dt-sidebar-border: var(--ui-stroke-secondary);
    --dt-user-bubble: var(--ui-chat-bubble-background);
    --dt-user-bubble-border: var(--ui-stroke-tertiary);

    --dt-font-sans: 'Segoe WPC', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif;
    --dt-font-mono: 'Cascadia Code', 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, Consolas, monospace;
    --dt-base-size: 1rem;
    --dt-line-height: 1.5;
    --dt-letter-spacing: 0;
    --dt-spacing-mul: 1;

    --radius: 0.75rem;
    --radius-scalar: 0.6;

    /* Space under last message vs overlay composer — driven by the measured composer height (see composer/index.tsx). */
    --thread-last-message-clearance: calc(var(--composer-measured-height) + 2rem);

    --composer-shell-pad-block-end: 0.625rem;
    --message-text-indent: 0.75rem;
    --conversation-text-font-size: 0.8125rem;
    --conversation-tool-font-size: var(--conversation-text-font-size);
    --conversation-caption-font-size: 0.75rem;
    --conversation-line-height: 1.125rem;
    --conversation-caption-line-height: 1rem;
    --conversation-turn-gap: 0.375rem;
    --sticky-human-top: 0.23rem;
    --file-tree-row-height: 1.375rem;

    --composer-width: 48.75rem;
    --composer-control-size: 1.75rem;
    --composer-control-primary-size: 1.875rem;
    --composer-control-gap: 0.25rem;
    --composer-row-gap: 0.25rem;
    --composer-ring-strength: 1;
    --composer-surface-pad-x: 0.5rem;
    --composer-surface-pad-y: 0.3125rem;
    --composer-input-min-height: 1.625rem;
    --composer-input-max-height: 9.375rem;
    --composer-input-inline-min-width: 8rem;
    --composer-fallback-height: 2.75rem;
    --composer-measured-height: calc(0.5rem + var(--composer-shell-pad-block-end) + var(--composer-fallback-height));
    --composer-surface-measured-height: var(--composer-fallback-height);
    --thread-viewport-height: max(
      0rem,
      calc(100% - var(--composer-measured-height) + var(--composer-surface-measured-height))
    );
    --vsq: min(0.5vh, 0.5vw);
    --image-preview-max-width: 34rem;
    --image-preview-height: clamp(16.25rem, calc(var(--vsq) * 100), 26.25rem);

    --sidebar-width: 14.8125rem;
    --chat-min-width: 28rem;
    --titlebar-control-size: 1.25rem;
    --titlebar-control-height: 1.375rem;
    --sidebar-content-inline-padding: 1rem;

    --sidebar: var(--dt-sidebar-bg);
    --sidebar-foreground: var(--dt-foreground);
    --sidebar-primary: var(--dt-primary);
    --sidebar-primary-foreground: var(--dt-primary-foreground);
    --sidebar-accent: var(--ui-control-active-background);
    --sidebar-accent-foreground: var(--dt-accent-foreground);
    --sidebar-border: var(--dt-sidebar-border);
    --sidebar-ring: var(--dt-ring);
    --sidebar-edge-border: color-mix(in srgb, var(--ui-base) 7.5%, transparent);
    --chrome-action-hover: var(--ui-control-hover-background);

    --midground: var(--dt-midground);
    --background: var(--dt-background);
    --foreground: var(--dt-foreground);

    --warm-glow: color-mix(in srgb, var(--ui-warm) 32%, color-mix(in srgb, var(--ui-accent) 6%, transparent));
    /* `--noise-opacity-mul` is set per-mode by `applyTheme()`. */
    --noise-opacity-mul: 1;
    --backdrop-invert-mul: 1;
  }

  :root.dark {
    /* Per-mode mix knobs — overridden inline by `applyTheme()` per skin. */
    --theme-mix-chrome: 74%;
    --theme-mix-card: 38%;
    --theme-mix-elevated: 46%;
    --theme-mix-bubble: 46%;
    --theme-neutral-chrome: #0d0d0e;
    --theme-neutral-sidebar: #0a0a0b;
    --theme-neutral-card: #161618;

    /* Dark-only accent palette overrides. */
    --ui-red: #e75e78;
    --ui-green: #55a583;
    --ui-cyan: #6f9ba6;

    --sidebar-edge-border: color-mix(in srgb, var(--ui-base) 12%, transparent);
    --composer-ring-strength: 1.3;
    --backdrop-invert-mul: 0;

    --ui-inline-code-background: color-mix(in srgb, #ffffff 7%, transparent);
    --ui-inline-code-border: color-mix(in srgb, #ffffff 10%, transparent);
    --ui-inline-code-foreground: color-mix(in srgb, #ffffff 88%, transparent);
    --ui-selection-background: color-mix(in srgb, #ffd24a 38%, transparent);
  }

  * {
    box-sizing: border-box;
    border-color: var(--dt-border);
  }

  html,
  body,
  #root {
    height: 100%;
  }

  html {
    font-size: var(--dt-base-size, 0.875rem);
  }

  body {
    margin: 0;
    background: var(--ui-chat-surface-background);
    color: var(--dt-foreground);
    font-family: var(--dt-font-sans);
    font-size: 0.8125rem;
    line-height: var(--dt-line-height, 1.55);
    letter-spacing: var(--dt-letter-spacing, 0);
    overflow: hidden;
    -webkit-user-select: none;
    user-select: none;
    -webkit-font-smoothing: antialiased;
  }

  button,
  textarea {
    font: inherit;
  }

  :where(
    a,
    .underline,
    [class~='hover:underline'],
    [class~='focus:underline'],
    [class~='focus-visible:underline'],
    [class~='group-hover:underline'],
    [class~='peer-hover:underline']
  ) {
    text-decoration-color: color-mix(in srgb, currentColor 20%, transparent);
    text-underline-offset: 0.25rem;
  }

  *::selection {
    background: var(--ui-selection-background);
    color: inherit;
  }
}

.dither {
  background: repeating-conic-gradient(currentColor 0% 25%, transparent 0% 50%) 0 0 / 0.125rem 0.125rem;
}

:root:not([style*='--theme-asset-bg:']) .theme-default-filler {
  display: block;
}

:root[style*='--theme-asset-bg:'] .theme-default-filler {
  display: none;
}

@layer utilities {
  [class*='rounded-full'],
  [class*=':rounded-full'] {
    border-radius: calc(var(--radius-scalar) * 9999rem);
  }
}

@keyframes arc-border {
  0% {
    background-position: 15% 15%;
  }
  100% {
    background-position: 75% 75%;
  }
}

.arc-border {
  --arc-c0: color-mix(in srgb, var(--dt-foreground) 0%, transparent);
  --arc-c1: var(--dt-midground);
  --arc-c2: var(--dt-background);
  --arc-angle: 160deg;
  --arc-width: 0.078125rem;
  --arc-inset: -0.125rem;
  --arc-duration: 2.23s;

  pointer-events: none;
  position: absolute;
  overflow: hidden;
  border-radius: inherit;
  inset: var(--arc-inset);
  padding: var(--arc-width);
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

:root.dark .arc-border {
  --arc-c1: var(--dt-foreground);
}

.arc-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    var(--arc-angle),
    transparent 0%,
    var(--arc-c0) 15%,
    var(--arc-c1) 20%,
    var(--arc-c2) 25%,
    transparent 35%,
    transparent 40%,
    var(--arc-c0) 55%,
    var(--arc-c1) 60%,
    var(--arc-c2) 65%,
    transparent 75%,
    transparent 80%,
    var(--arc-c0) 95%,
    var(--arc-c1) 100%
  );
  background-size: 300% 300%;
  animation: arc-border var(--arc-duration) linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .arc-border::before {
    animation: none;
  }
}

button {
  -webkit-app-region: no-drag;
}

[data-slot='button'] {
  box-shadow: none;
  transition-duration: 100ms;
}

[data-slot='button'][data-variant='outline'],
[data-slot='button'][data-variant='secondary'] {
  border-color: var(--ui-stroke-secondary);
  background: var(--ui-bg-tertiary);
  color: var(--ui-text-primary);
}

[data-slot='button'][data-variant='ghost'] {
  color: var(--ui-text-secondary);
}

[data-slot='button'][data-variant='outline']:hover,
[data-slot='button'][data-variant='secondary']:hover,
[data-slot='button'][data-variant='ghost']:hover {
  background: var(--chrome-action-hover);
  color: var(--ui-text-primary);
}

[data-slot='dropdown-menu-content'],
[data-slot='select-content'],
[data-slot='dialog-content'] {
  border-color: var(--ui-stroke-secondary);
  background: color-mix(in srgb, var(--ui-bg-elevated) 96%, transparent);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(0.75rem) saturate(1.08);
  -webkit-backdrop-filter: blur(0.75rem) saturate(1.08);
}

[data-slot='dropdown-menu-item']:focus,
[data-slot='dropdown-menu-checkbox-item']:focus,
[data-slot='dropdown-menu-radio-item']:focus {
  background: var(--ui-bg-tertiary);
  color: var(--ui-text-primary);
}

input,
textarea,
[contenteditable]:not([contenteditable='false']),
[data-slot='aui_user-message-root'],
[data-slot='aui_assistant-message-content'],
[data-selectable-text='true'],
[data-selectable-text='true'] * {
  -webkit-user-select: text;
  user-select: text;
}

button,
[role='button'] {
  -webkit-user-select: none;
  user-select: none;
}

img,
picture,
video,
canvas,
svg {
  -webkit-user-select: none;
  user-select: none;
}

img,
video,
canvas {
  -webkit-user-drag: none;
}

/* Shared input chrome — mirrors composer hover/focus FX. Unlayered to beat Tailwind utilities. */
.desktop-input-chrome {
  --ring-pct: 18%;
  --ring-fall: var(--dt-input);
  background: color-mix(in srgb, var(--dt-card) 68%, transparent);
  border-color: color-mix(
    in srgb,
    var(--dt-composer-ring) calc(var(--ring-pct) * var(--composer-ring-strength)),
    var(--ring-fall)
  );
  box-shadow: var(--shadow-composer);
  transition:
    background-color 200ms ease-out,
    border-color 200ms ease-out,
    box-shadow 200ms ease-out;
}

.desktop-input-chrome:hover {
  --ring-pct: 30%;
  background: color-mix(in srgb, var(--dt-card) 86%, transparent);
}

.desktop-input-chrome:focus {
  --ring-pct: 45%;
  --ring-fall: transparent;
  background: var(--dt-card);
  box-shadow: var(--shadow-composer-focus);
  outline: none;
}

.desktop-input-chrome[aria-invalid='true'] {
  border-color: var(--dt-destructive);
}

.desktop-input-chrome[aria-invalid='true']:focus {
  box-shadow:
    0 0 0 0.125rem color-mix(in srgb, var(--dt-destructive) 18%, transparent),
    0 0 0 0.0625rem color-mix(in srgb, var(--dt-destructive) 34%, transparent),
    0 0.1875rem 0.625rem color-mix(in srgb, var(--dt-destructive) 12%, transparent);
}

@layer components {
  .scrollbar-dt,
  .scrollbar-dt * {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--dt-midground) 18%, transparent) transparent;
  }

  .scrollbar-dt::-webkit-scrollbar,
  .scrollbar-dt *::-webkit-scrollbar {
    width: 0.5rem;
    height: 0.5rem;
  }

  .scrollbar-dt::-webkit-scrollbar-track,
  .scrollbar-dt::-webkit-scrollbar-corner,
  .scrollbar-dt *::-webkit-scrollbar-track,
  .scrollbar-dt *::-webkit-scrollbar-corner {
    background: transparent;
  }

  .scrollbar-dt::-webkit-scrollbar-thumb,
  .scrollbar-dt *::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--dt-midground) 18%, transparent);
    border-radius: 9999rem;
    border: 0.125rem solid transparent;
    background-clip: padding-box;
  }

  .scrollbar-dt::-webkit-scrollbar-thumb:hover,
  .scrollbar-dt *::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--dt-midground) 40%, transparent);
    background-clip: padding-box;
  }

  .scrollbar-dt::-webkit-scrollbar-button,
  .scrollbar-dt *::-webkit-scrollbar-button {
    display: none;
  }

  /* Variant for portaled overlays (Radix DropdownMenu, Popover, etc.) that
     render under document.body, outside the `.scrollbar-dt` scope on
     #root. Same visual treatment, applied directly to the overlay
     container so its (and only its) internal scrollbar is themed. */
  .dt-portal-scrollbar {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--dt-midground) 28%, transparent) transparent;
  }

  .dt-portal-scrollbar::-webkit-scrollbar {
    width: 0.375rem;
    height: 0.375rem;
  }

  .dt-portal-scrollbar::-webkit-scrollbar-track,
  .dt-portal-scrollbar::-webkit-scrollbar-corner {
    background: transparent;
  }

  .dt-portal-scrollbar::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--dt-midground) 28%, transparent);
    border-radius: 9999rem;
    border: 0.0625rem solid transparent;
    background-clip: padding-box;
  }

  .dt-portal-scrollbar::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--dt-midground) 50%, transparent);
    background-clip: padding-box;
  }

  .dt-portal-scrollbar::-webkit-scrollbar-button {
    display: none;
  }
}

/* Bottom clearance lives on [data-slot='aui_composer-clearance'] —
   virtualized items unmount, so :nth-last-child can't fire reliably. */

[data-slot='aui_assistant-message-content'] {
  padding-left: var(--message-text-indent);
  font-size: var(--conversation-text-font-size);
  line-height: 1.5;
}

[data-slot='aui_assistant-message-root'] {
  width: 100%;
}

[data-slot='aui_assistant-message-content'] .aui-md,
[data-slot='aui_assistant-message-content'] .aui-md :where(p, li, blockquote, table, pre) {
  font-size: inherit;
}

/* Streamed prose hangs slightly indented from the tool/todo column so the
   reading column reads as a "reply" within the conversation gutter. Tools,
   todos, and thinking blocks keep the existing --message-text-indent so they
   remain flush with the user message text above them. */
[data-slot='aui_assistant-message-content'] > .aui-md {
  padding-inline-start: var(--md-text-indent, 0.5rem);
}

[data-slot='aui_user-message-root'] {
  top: var(--sticky-human-top);
}

[data-slot='aui_user-message-root'],
[data-slot='aui_edit-composer-root'] {
  font-size: var(--conversation-text-font-size);
}

/* Sticky human bubbles clamp to ~2 lines with a soft bottom fade so a long
   prompt doesn't dominate the viewport while you read the response stuck
   beneath it. The clamp lifts on hover / focus (clicking the bubble opens the
   edit composer, which already shows the full text). --human-msg-full is the
   measured content height (set in UserMessage) so expand/collapse animates to
   the real height instead of overshooting the cap. */
.sticky-human-clamp {
  max-height: calc(2 * var(--dt-line-height) * var(--conversation-text-font-size) + 0.15rem);
  overflow: hidden;
  transition: max-height 0.08s cubic-bezier(0.4, 0, 0.2, 1);
}

.sticky-human-clamp[data-clamped='true'] {
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent);
  mask-image: linear-gradient(to bottom, #000 55%, transparent);
}

.composer-human-message:hover .sticky-human-clamp,
.composer-human-message:focus-within .sticky-human-clamp {
  max-height: min(var(--human-msg-full, 24rem), 24rem);
  overflow-y: auto;
  -webkit-mask-image: none;
  mask-image: none;
}

/* The thread renders items in natural document flow (padding spacers, not
   transforms) and @tanstack/react-virtual already adjusts scrollTop itself
   when an off-screen turn is measured and its real height differs from the
   220px estimate. The browser's native scroll anchoring (overflow-anchor:
   auto) would adjust scrollTop for that SAME size delta, so the two
   double-correct and the view lurches — most visibly on Windows mouse wheels,
   whose coarse notches mount/measure several under-estimated turns per tick.
   Opt out of native anchoring so only the virtualizer compensates. */
[data-slot='aui_thread-viewport'] {
  overflow-anchor: none;
}

[data-slot='aui_thread-content'] {
  max-width: var(--composer-width);
  padding-inline: 1.5rem;
}

[data-slot='aui_intro'] {
  align-items: center;
  justify-content: center;
  padding-bottom: var(--composer-measured-height);
  text-align: center;
}

[data-slot='aui_intro'] > div {
  max-width: min(var(--composer-width), 82vw);
}

[data-slot='aui_intro'] p:last-child {
  max-width: 34rem;
  margin-inline: auto;
  color: var(--ui-text-tertiary);
  font-size: 0.875rem;
  line-height: 1.45;
}

.fit-text {
  display: flex;
  font-size: var(--fit-text-min, 1rem);
  container-type: inline-size;
  --captured-length: initial;
  --support-sentinel: var(--captured-length, 9999px);
}

.fit-text > [aria-hidden='true'] {
  visibility: hidden;
}

.fit-text > :not([aria-hidden='true']) {
  flex-grow: 1;
  container-type: inline-size;
  --captured-length: 100cqi;
  --available-space: var(--captured-length);
}

.fit-text > :not([aria-hidden='true']) > * {
  display: block;
  inline-size: var(--available-space);
  line-height: var(--fit-text-line-height, 1);
  --support-sentinel: inherit;
  --captured-length: 100cqi;
  --ratio: tan(atan2(var(--available-space), var(--available-space) - var(--captured-length)));
  --font-size: clamp(
    var(--fit-text-min, 1em),
    1em * var(--ratio),
    var(--fit-text-max, infinity * 1px) - var(--support-sentinel)
  );
  font-size: var(--font-size);
}

@container (inline-size > 0) {
  .fit-text > :not([aria-hidden='true']) > * {
    white-space: nowrap;
  }
}

@property --captured-length {
  syntax: '<length>';
  initial-value: 0px;
  inherits: true;
}

@property --captured-length2 {
  syntax: '<length>';
  initial-value: 0px;
  inherits: true;
}

[data-slot='composer-root'] {
  width: min(var(--composer-width), calc(100% - 2rem));
  padding-bottom: var(--composer-shell-pad-block-end);
}

[data-slot='composer-root'] > .pointer-events-none {
  background: linear-gradient(
    to bottom,
    transparent,
    color-mix(in srgb, var(--ui-chat-surface-background) 88%, transparent)
  ) !important;
}

[data-slot='composer-surface'] {
  border-color: var(--ui-stroke-secondary) !important;
  box-shadow: var(--shadow-composer) !important;
}

[data-slot='composer-fade'] {
  min-height: 2.375rem;
}

[data-slot='composer-rich-input'] {
  color: var(--ui-text-primary);
  font-size: 0.8125rem;
}

[data-slot='composer-rich-input']:empty::before {
  color: var(--ui-text-tertiary) !important;
}

[data-slot='composer-root']:focus-within [data-slot='composer-surface'] > [aria-hidden='true'] {
  background: var(--ui-chat-bubble-background) !important;
}

/* Tool/thinking blocks now live at message-text alignment (no leading
   chevron column to escape into), so their headers and bodies share a
   common left edge with the model's text. */
[data-slot='aui_assistant-message-content'] > [data-slot='tool-block'],
[data-slot='aui_assistant-message-content'] > [data-slot='aui_thinking-disclosure'] {
  width: 100%;
  max-width: 100%;
}

[data-slot='aui_assistant-message-content'] .aui-md [data-streamdown='code-block'] code {
  max-width: none;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  overflow-x: visible;
  overflow-wrap: inherit;
  vertical-align: baseline;
  word-break: inherit;
  white-space: inherit;
}

/* Streamdown's adapter wraps code fences in a `data-streamdown="code-block"`
   container with its own card chrome. We render our own <CodeCard>, so this
   strips the upstream chrome down to a layout-only passthrough. */
[data-slot='aui_assistant-message-content'] .aui-md [data-streamdown='code-block'] {
  contain: none;
  overflow: visible;
  margin-block: 0.375rem !important;
  padding: 0 !important;
  gap: 0 !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  color: inherit;
}

[data-slot='aui_assistant-message-content'] .aui-md [data-streamdown='code-block']:has(.aui-prose-fence) {
  margin-block: 0 !important;
}

[data-slot='aui_assistant-message-content'] .aui-md :not(pre) > code {
  border: 0.0625rem solid var(--ui-inline-code-border);
  background: var(--ui-inline-code-background);
  color: var(--ui-inline-code-foreground);
}

[data-slot='aui_assistant-message-content'] .aui-md :where(.aui-shiki, .aui-shiki > pre) {
  margin: 0 !important;
}

[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table {
  border-spacing: 0;
}

[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table > table,
[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table thead,
[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table tbody,
[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table tr,
[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table th,
[data-slot='aui_assistant-message-content'] .aui-md .aui-md-table td {
  margin: 0 !important;
  margin-block-start: 0 !important;
  margin-block-end: 0 !important;
}

/* Tool / thinking blocks are scaffolding around the model's reply, so we
   keep them transparent and fade them slightly. The reading column (prose)
   stays at full strength; scaffolding lifts back to full opacity on
   hover/focus so it stays legible when the user actually wants to read it. */
[data-slot='tool-block'],
[data-slot='aui_thinking-disclosure'] {
  background: transparent !important;
}

[data-slot='aui_assistant-message-content'] > :is([data-slot='tool-block'], [data-slot='aui_thinking-disclosure']) {
  opacity: 0.67;
  transition: opacity 120ms ease-out;
}

[data-slot='aui_assistant-message-content']
  > :is([data-slot='tool-block'], [data-slot='aui_thinking-disclosure']):is(:hover, :focus-within) {
  opacity: 1;
}

/* Conversation block rhythm. Consecutive tool calls stay tight so a step
   sequence reads as one action group; the gap between any scaffolding
   block and adjacent prose bumps up so the model's reply visually
   separates from its scaffolding. */
[data-slot='tool-block'] + [data-slot='tool-block'] {
  margin-top: 0.375rem;
}

[data-slot='tool-block']:has(> :nth-child(2)) + [data-slot='tool-block'] {
  margin-top: 0.625rem;
}

[data-slot='aui_assistant-message-content']
  :is([data-slot='tool-block'], [data-slot='aui_thinking-disclosure'])
  + .aui-md,
[data-slot='aui_assistant-message-content']
  .aui-md
  + :is([data-slot='tool-block'], [data-slot='aui_thinking-disclosure']) {
  margin-top: 1rem;
}

[data-slot='aui_assistant-message-content'] [data-slot='aui_thinking-disclosure'] + [data-slot='tool-block'],
[data-slot='aui_assistant-message-content'] [data-slot='tool-block'] + [data-slot='aui_thinking-disclosure'] {
  margin-top: 0.75rem;
}

[data-slot='aui_assistant-message-content'] > [data-slot='tool-block']:first-child {
  margin-top: 0;
}

/* Message action bars — flat icon hits with default dim; only the hovered/focused control is full-strength. */
[data-slot='aui_msg-actions'] button {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  padding: 0;
  gap: 0;
  height: auto;
  width: auto;
  min-height: 0;
  min-width: 0;
  flex-shrink: 0;
  cursor: pointer;
  color: var(--color-muted-foreground);
  opacity: 0.5;
}

[data-slot='aui_msg-actions'] button:disabled {
  cursor: default;
}

[data-slot='aui_msg-actions'] button:hover {
  background: transparent;
  color: var(--color-foreground);
  opacity: 1;
}

[data-slot='aui_msg-actions'] button:active {
  background: transparent;
}

[data-slot='aui_msg-actions'] button:focus-visible {
  opacity: 1;
}

[data-slot='aui_msg-actions'] button svg {
  width: 0.875rem;
  height: 0.875rem;
}

/* Live thinking preview window. Pairs with the ResizeObserver in
   ThinkingDisclosure that pins scrollTop to the bottom — older lines fade
   into the top mask while the latest tokens settle in below. */
.thinking-preview {
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 28%, black 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, black 28%, black 100%);
}