@layer reset, theme, base, components, utilities;

@layer reset {
  html {
    box-sizing: border-box;
    min-inline-size: 100%;
  }

  body {
    margin: 0;
  }

  button,
  input {
    box-sizing: border-box;
    font: inherit;
  }
}

@layer theme {
  :root {
    color-scheme: light dark;

    --page-bg-light: #f5f6f2;
    --page-bg-dark: #101312;
    --page-bg: var(--page-bg-light);
    --surface-light: #ffffff;
    --surface-dark: #191d1b;
    --surface: var(--surface-light);
    --surface-raised-light: #f9faf7;
    --surface-raised-dark: #202522;
    --surface-raised: var(--surface-raised-light);
    --text-light: #18201c;
    --text-dark: #edf1ed;
    --text: var(--text-light);
    --muted-light: #69736d;
    --muted-dark: #a1aba4;
    --muted: var(--muted-light);
    --soft-light: #e8ece6;
    --soft-dark: #2a312d;
    --soft: var(--soft-light);
    --settings-divider: var(--soft);
    --track-light: #d9dfd9;
    --track-dark: #3d4740;
    --track: var(--track-light);
    --accent-light: #0d735e;
    --accent-dark: #68dcc1;
    --accent: var(--accent-light);
    --success-light: #0d735e;
    --success-dark: #74e1c5;
    --success: var(--success-light);
    --danger-light: #ad3e43;
    --danger-dark: #ff9a94;
    --danger: var(--danger-light);
    --palette-background: #f9faf7;
    --palette-gap: 8px;
    --hue-count: 12;
    --palette-column-count: 14;
    --step-count: 12;
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --page-bg: var(--page-bg-dark);
      --surface: var(--surface-dark);
      --surface-raised: var(--surface-raised-dark);
      --text: var(--text-dark);
      --muted: var(--muted-dark);
      --soft: var(--soft-dark);
      --track: var(--track-dark);
      --accent: var(--accent-dark);
      --success: var(--success-dark);
      --danger: var(--danger-dark);
      --palette-background: var(--surface-raised-dark);
    }
  }

  @supports (color: light-dark(white, black)) {
    :root {
      --page-bg: light-dark(var(--page-bg-light), var(--page-bg-dark));
      --surface: light-dark(var(--surface-light), var(--surface-dark));
      --surface-raised: light-dark(
        var(--surface-raised-light),
        var(--surface-raised-dark)
      );
      --text: light-dark(var(--text-light), var(--text-dark));
      --muted: light-dark(var(--muted-light), var(--muted-dark));
      --soft: light-dark(var(--soft-light), var(--soft-dark));
      --track: light-dark(var(--track-light), var(--track-dark));
      --accent: light-dark(var(--accent-light), var(--accent-dark));
      --success: light-dark(var(--success-light), var(--success-dark));
      --danger: light-dark(var(--danger-light), var(--danger-dark));
      --palette-background: light-dark(
        var(--surface-raised-light),
        var(--surface-raised-dark)
      );
    }
  }
}

@layer base {
  body {
    min-block-size: 100dvh;
    background: var(--page-bg);
    color: var(--text);
    font-family:
      Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
      sans-serif;
    line-height: 1.5;
    text-rendering: optimizeLegibility;
  }

  button,
  input {
    color: inherit;
  }

  button {
    cursor: pointer;
  }

  h1,
  h2,
  p {
    margin: 0;
  }

  h1,
  h2 {
    letter-spacing: -0.045em;
  }
}

@layer components {
  .app-shell {
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    block-size: 100dvh;
    min-block-size: 100dvh;
    overflow: clip;
  }

  .section-kicker {
    color: var(--accent);
    font-size: 0.66rem;
    font-weight: 750;
    letter-spacing: 0.16em;
    line-height: 1.2;
    text-transform: uppercase;
  }

  .workspace {
    display: grid;
    grid-template-columns: minmax(17rem, 21rem) minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr);
    min-block-size: 0;
  }

  .settings-panel {
    --panel-padding: clamp(1.15rem, 2.4vw, 2rem);
    display: flex;
    flex-direction: column;
    min-inline-size: 0;
    min-block-size: 0;
    overflow: auto;
    padding-block: var(--panel-padding);
    padding-inline: 0;
    background: var(--surface);
    box-shadow: 0 1rem 3.5rem rgb(14 27 20 / 0.07);
  }

  .panel-heading,
  .field-label-row {
    display: flex;
  }

  .panel-heading,
  .settings-section,
  .settings-danger-zone {
    padding-inline: var(--panel-padding);
  }

  .panel-heading,
  .field-label-row {
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
  }

  .panel-heading h2 {
    margin-block-start: 0.2rem;
    font-size: 1.15rem;
    line-height: 1.1;
  }

  .panel-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 0 0 auto;
  }

  .panel-action {
    display: grid;
    place-items: center;
    inline-size: 2.5rem;
    block-size: 2.5rem;
    padding: 0;
    border: 1px solid var(--soft);
    border-radius: 0.7rem;
    background: var(--surface-raised);
    color: var(--accent);
    transition:
      background-color 160ms ease,
      border-color 160ms ease,
      color 160ms ease,
      transform 160ms ease;
  }

  .panel-action svg {
    inline-size: 1.25rem;
    block-size: 1.25rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
  }

  .panel-action:hover {
    border-color: var(--accent);
    background: var(--accent);
    color: var(--surface);
    transform: translateY(-1px);
  }

  .reset-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    inline-size: 100%;
    min-block-size: 3rem;
    padding-block: 0.65rem;
    padding-inline: 0.8rem;
    border: 1px solid var(--danger);
    border-radius: 0.7rem;
    background: transparent;
    color: var(--danger);
    font-size: 0.74rem;
    font-weight: 750;
    letter-spacing: 0.03em;
    transition:
      background-color 160ms ease,
      border-color 160ms ease,
      color 160ms ease,
      transform 160ms ease;
  }

  .reset-button:hover {
    background: var(--danger);
    color: var(--surface);
    transform: translateY(-1px);
  }

  .settings-danger-zone {
    display: grid;
    grid-column: 1 / -1;
    margin-block-start: 1.8rem;
    padding-block-start: 1rem;
    border-block-start: 1px solid var(--settings-divider);
  }

  .reset-button:focus-visible,
  .panel-action:focus-visible,
  .dialog-close-button:focus-visible,
  .export-copy-button:focus-visible,
  .range-input:focus-visible,
  .color-control input:focus-visible,
  .checkbox-control input:focus-visible {
    outline: 0.16rem solid var(--accent);
    outline-offset: 0.18rem;
  }

  .control-stack {
    display: grid;
    gap: 0;
    margin-block-start: clamp(1.8rem, 4vw, 3rem);
  }

  .settings-section {
    display: grid;
    grid-column: 1 / -1;
    gap: 1.45rem;
  }

  .settings-section[hidden] {
    display: none;
  }

  .settings-section > .control-field {
    grid-column: 1 / -1;
  }

  .settings-section + .settings-section {
    margin-block-start: 1.45rem;
    padding-block-start: 1.45rem;
    border-block-start: 1px solid var(--settings-divider);
  }

  .control-field {
    display: grid;
    gap: 0.7rem;
  }

  .color-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
  }

  .color-field .field-label-row {
    min-inline-size: 0;
    flex: 1 1 auto;
  }

  .color-field .color-control {
    flex: 0 0 auto;
  }

  .checkbox-control {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    min-block-size: 1.75rem;
    color: var(--text);
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 750;
    letter-spacing: 0.04em;
  }

  .checkbox-control input[type="checkbox"] {
    flex: 0 0 auto;
    inline-size: 1.1rem;
    block-size: 1.1rem;
    margin: 0;
    accent-color: var(--accent);
  }

  .gamut-warning-count {
    color: var(--danger);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
  }

  .field-label-row {
    align-items: baseline;
  }

  .field-label-row label {
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 750;
    letter-spacing: 0.04em;
  }

  .field-label-row output {
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.72rem;
    font-weight: 700;
    white-space: nowrap;
  }

  .range-end-labels {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    color: var(--muted);
    font-size: 0.72rem;
  }

  .control-help {
    margin: 0;
    color: var(--muted);
    font-size: 0.72rem;
    line-height: 1.7;
  }

  .color-control {
    display: flex;
    align-items: center;
    gap: 0.8rem;
  }

  .color-control input[type="color"] {
    inline-size: 3.2rem;
    block-size: 3.2rem;
    padding: 0.26rem;
    border: 0;
    border-radius: 0.9rem;
    background: var(--soft);
    cursor: pointer;
  }

  .color-control input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
  }

  .color-control input[type="color"]::-webkit-color-swatch {
    border: 0;
    border-radius: 0.65rem;
  }

  .range-input {
    inline-size: 100%;
    block-size: 1.35rem;
    margin: 0;
    appearance: none;
    background: transparent;
    accent-color: var(--accent);
  }

  .range-input::-webkit-slider-runnable-track {
    block-size: 0.28rem;
    border-radius: 999px;
    background:
      linear-gradient(
        to right,
        var(--accent) var(--range-progress, 0%),
        var(--track) var(--range-progress, 0%)
      );
  }

  .range-input::-moz-range-track {
    block-size: 0.28rem;
    border-radius: 999px;
    background: var(--track);
  }

  .range-input::-moz-range-progress {
    block-size: 0.28rem;
    border-radius: 999px;
    background: var(--accent);
  }

  .range-input::-webkit-slider-thumb {
    inline-size: 1rem;
    block-size: 1rem;
    margin-block-start: -0.36rem;
    appearance: none;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0.15rem 0.45rem rgb(14 27 20 / 0.2);
  }

  .range-input::-moz-range-thumb {
    inline-size: 1rem;
    block-size: 1rem;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0.15rem 0.45rem rgb(14 27 20 / 0.2);
  }

  .curve-field {
    grid-column: 1 / -1;
  }

  .curve-mode-control {
    display: grid;
    gap: 0.45rem;
  }

  .curve-mode-label {
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .curve-mode-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
  }

  .curve-mode-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-block-size: 2.15rem;
    padding-block: 0.42rem;
    padding-inline: 0.65rem;
    border: 1px solid var(--soft);
    border-radius: 0.6rem;
    background: var(--surface-raised);
    color: var(--text);
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 700;
  }

  .curve-mode-option:focus-within {
    outline: 0.16rem solid var(--accent);
    outline-offset: 0.12rem;
  }

  .curve-mode-option input[type="radio"] {
    flex: 0 0 auto;
    inline-size: 1rem;
    block-size: 1rem;
    margin: 0;
    accent-color: var(--accent);
  }

  .curve-mode-option input[type="radio"]:checked + span {
    color: var(--accent);
  }

  .curve-editor {
    position: relative;
    min-block-size: 10rem;
    overflow: visible;
    border: 1px solid var(--soft);
    border-radius: 0.8rem;
    background:
      linear-gradient(
        to bottom,
        color-mix(in srgb, var(--accent) 8%, transparent),
        transparent
      ),
      var(--surface-raised);
    touch-action: none;
  }

  .curve-plot,
  .curve-handle-layer {
    position: absolute;
    inset: 0;
    inline-size: 100%;
    block-size: 100%;
  }

  .curve-plot {
    overflow: visible;
    pointer-events: none;
  }

  .curve-grid-line {
    stroke: var(--track);
    stroke-width: 0.6;
    stroke-dasharray: 1.5 2.5;
    vector-effect: non-scaling-stroke;
  }

  .curve-path {
    fill: none;
    stroke: var(--accent);
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2.4;
    vector-effect: non-scaling-stroke;
  }

  .curve-handle-layer {
    pointer-events: none;
  }

  .curve-handle {
    position: absolute;
    inline-size: 1.05rem;
    block-size: 1.05rem;
    padding: 0;
    border: 0.18rem solid var(--surface);
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0.18rem 0.55rem rgb(14 27 20 / 0.26);
    cursor: grab;
    pointer-events: auto;
    transform: translate(-50%, -50%);
    transition:
      transform 120ms ease,
      box-shadow 120ms ease;
  }

  .curve-handle[hidden] {
    display: none;
  }

  .curve-handle:hover,
  .curve-handle.is-dragging {
    box-shadow: 0 0.22rem 0.7rem rgb(14 27 20 / 0.32);
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.18);
  }

  .curve-handle:focus-visible {
    outline: 0.16rem solid var(--accent);
    outline-offset: 0.22rem;
  }

  .curve-point-values {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.64rem;
    text-align: center;
  }

  .curve-point-values output {
    color: var(--accent);
    font-weight: 750;
  }

  .curve-bound {
    display: grid;
    gap: 0.5rem;
  }

  .curve-s-controls {
    display: grid;
    gap: 0.8rem;
  }

  .curve-s-controls[hidden] {
    display: none;
  }

  .curve-bound .field-label-row label {
    font-size: 0.68rem;
  }

  .export-dialog {
    inline-size: min(48rem, calc(100vw - 2rem));
    max-block-size: min(48rem, calc(100dvh - 2rem));
    margin: auto;
    padding: 0;
    border: 1px solid var(--soft);
    border-radius: 1rem;
    background: var(--surface);
    box-shadow: 0 1.5rem 4rem rgb(14 27 20 / 0.28);
    color: var(--text);
  }

  .export-dialog::backdrop {
    background: rgb(10 18 14 / 0.66);
    backdrop-filter: blur(0.15rem);
  }

  .export-dialog-content {
    display: grid;
    gap: 0.85rem;
    max-block-size: calc(100dvh - 2rem);
    overflow: auto;
    padding: clamp(1.15rem, 3vw, 2rem);
  }

  .export-dialog-header {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 1rem;
  }

  .export-dialog-header h2 {
    margin: 0;
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    line-height: 1.15;
  }

  .dialog-close-button {
    display: grid;
    place-items: center;
    inline-size: 2.2rem;
    block-size: 2.2rem;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--muted);
  }

  .dialog-close-button:hover {
    background: var(--soft);
    color: var(--text);
  }

  .dialog-close-button svg {
    inline-size: 1.25rem;
    block-size: 1.25rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-width: 1.8;
  }

  .export-dialog-description,
  .export-copy-hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.72rem;
    line-height: 1.6;
  }

  .export-json-preview {
    min-block-size: 12rem;
    max-block-size: min(58dvh, 32rem);
    overflow: auto;
    margin: 0;
    padding: 1rem;
    border: 1px solid var(--soft);
    border-radius: 0.7rem;
    background: var(--page-bg);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.72rem;
    line-height: 1.65;
    tab-size: 2;
    user-select: text;
    -webkit-user-select: text;
    white-space: pre;
  }

  .export-json-preview:focus-visible {
    outline: 0.16rem solid var(--accent);
    outline-offset: 0.18rem;
  }

  .export-copy-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-inline-size: 0;
  }

  .export-copy-hint {
    flex: 1 1 auto;
    min-inline-size: 0;
  }

  .export-dialog-actions {
    display: flex;
    flex: 0 0 auto;
    justify-content: end;
  }

  .export-copy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-block-size: 2.8rem;
    padding-block: 0.65rem;
    padding-inline: 1rem;
    border: 0;
    border-radius: 0.7rem;
    background: var(--accent);
    color: var(--surface);
    font-size: 0.74rem;
    font-weight: 750;
    letter-spacing: 0.03em;
    transition:
      background-color 160ms ease,
      filter 160ms ease,
      transform 160ms ease;
  }

  .export-copy-button:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
  }

  .export-copy-button[data-state="success"] {
    background: var(--success);
  }

  .export-copy-button[data-state="error"] {
    background: var(--danger);
  }

  .export-copy-button svg {
    inline-size: 1rem;
    block-size: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
  }

  .preview-panel {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    min-inline-size: 0;
    min-block-size: 0;
    overflow: clip;
    padding: clamp(1.15rem, 2.4vw, 2rem);
    background: var(--surface-raised);
  }

  html[data-grayscale-preview] body {
    filter: grayscale(1);
  }

  .compatibility-note {
    grid-row: 1;
    padding-block-end: 0.8rem;
    color: var(--muted);
    font-size: 0.72rem;
  }

  .palette-frame {
    grid-row: 2;
    min-inline-size: 0;
    min-block-size: 0;
    overflow: auto;
    padding: clamp(0.45rem, 1vw, 0.85rem);
    border-radius: 1rem;
    background: var(--palette-background);
  }

  .palette-grid {
    display: grid;
    grid-template-columns: repeat(var(--palette-column-count), minmax(0, 1fr));
    gap: var(--palette-gap);
    min-inline-size: 0;
    block-size: 100%;
    min-block-size: 100%;
    align-items: stretch;
  }

  .hue-column {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    gap: var(--palette-gap);
    min-inline-size: 0;
    min-block-size: 100%;
  }

  .hue-header {
    min-inline-size: 0;
    padding-inline: 0.1rem;
  }

  .hue-label {
    display: block;
    overflow: hidden;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: clamp(0.48rem, 0.65vw, 0.68rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-overflow: ellipsis;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .swatch-stack {
    display: grid;
    grid-template-rows: repeat(var(--step-count), minmax(1rem, 1fr));
    gap: var(--palette-gap);
    min-inline-size: 0;
    min-block-size: 0;
  }

  .swatch {
    position: relative;
    display: grid;
    place-items: start;
    min-inline-size: 0;
    min-block-size: 1rem;
    overflow: visible;
    padding-block: 0;
    padding-inline: clamp(0.28rem, 0.7vw, 0.62rem);
    border: 0;
    border-radius: clamp(0px, calc(var(--palette-gap) * 0.6), 0.6rem);
    background: transparent;
    color: var(--swatch-foreground, #fff);
    forced-color-adjust: none;
    isolation: isolate;
    transition:
      transform 160ms ease,
      filter 160ms ease;
  }

  .swatch::before {
    position: absolute;
    z-index: -1;
    inset: 0;
    border-radius: inherit;
    content: "";
  }

  /* Keep the visible result in the same sRGB space used by the tone solver. */
  .swatch::before {
    background-color: var(--fallback-color);
  }

  .swatch-alert {
    position: absolute;
    z-index: 1;
    inset-block-start: 0.5rem;
    inset-inline-end: 0.5rem;
    inline-size: 0.4rem;
    block-size: 0.4rem;
    border-radius: 50%;
    background: var(--swatch-foreground, #fff);
    pointer-events: none;
  }

  @supports (mix-blend-mode: difference) {
    .swatch-alert {
      background: #fff;
      mix-blend-mode: difference;
    }
  }

  .swatch:hover:not(:disabled) {
    z-index: 1;
    filter: saturate(1.08);
    transform: scale(1.015);
  }

  .swatch:focus-visible {
    z-index: 2;
    outline: 0.18rem solid currentColor;
    outline-offset: 0.16rem;
  }

  .swatch.is-copied {
    z-index: 3;
    filter: saturate(1.12);
    transform: scale(1.035);
  }

  .swatch-meta {
    position: absolute;
    inset-block-end: 0.42rem;
    inset-inline: 0.42rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.3rem;
    overflow: hidden;
    padding-block: 0.2rem;
    padding-inline: 0.35rem;
    border-radius: 0.28rem;
    background: rgb(0 0 0 / 0.2);
    color: inherit;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: clamp(0.42rem, 0.58vw, 0.62rem);
    font-weight: 750;
    opacity: 0;
    pointer-events: none;
    text-align: start;
    text-overflow: ellipsis;
    transform: translateY(0.25rem);
    transition:
      opacity 140ms ease,
      transform 140ms ease;
    white-space: nowrap;
  }

  .swatch:hover .swatch-meta,
  .swatch:focus-visible .swatch-meta,
  .swatch.is-copied .swatch-meta {
    opacity: 1;
    transform: translateY(0);
  }

  .swatch-hex {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .swatch-action {
    flex: 0 0 auto;
    opacity: 0.76;
  }

  .toast-container {
    position: fixed;
    z-index: 10;
    inset-block-end: 1rem;
    inset-inline-end: 1rem;
    pointer-events: none;
  }

  .toast {
    position: fixed;
    display: none;
    align-items: center;
    gap: 0.8rem;
    inline-size: min(26rem, calc(100vw - 2rem));
    max-inline-size: 100%;
    inset-block-start: auto;
    inset-block-end: 1rem;
    inset-inline-start: auto;
    inset-inline-end: 1rem;
    margin: 0;
    padding-block: 0.75rem;
    padding-inline: 1rem 0.7rem;
    border: 1px solid var(--soft);
    border-radius: 0.75rem;
    background: var(--surface);
    box-shadow: 0 0.9rem 2.5rem rgb(14 27 20 / 0.2);
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 700;
    opacity: 0;
    pointer-events: auto;
    transform: translateY(0.5rem);
    transition:
      opacity 180ms ease,
      transform 180ms ease,
      display 180ms allow-discrete;
  }

  .toast:is(:popover-open, .is-visible) {
    display: flex;
    opacity: 1;
    transform: translateY(0);
  }

  .toast[data-kind="error"] {
    border-color: color-mix(in srgb, var(--danger) 45%, var(--soft));
  }

  .toast-close {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    inline-size: 1.6rem;
    block-size: 1.6rem;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1;
  }

  .toast-close:hover {
    background: var(--soft);
    color: var(--text);
  }

  .toast-close:focus-visible {
    outline: 0.16rem solid var(--accent);
    outline-offset: 0.18rem;
  }

  @starting-style {
    .toast:is(:popover-open, .is-visible) {
      opacity: 0;
      transform: translateY(0.5rem);
    }
  }

  .noscript-message {
    position: fixed;
    inset-block-start: 1rem;
    inset-inline: 1rem;
    padding: 1rem;
    border-radius: 0.75rem;
    background: #fff;
    color: #111;
  }

  @media (max-width: 760px) {
    .app-shell {
      block-size: auto;
      overflow: visible;
    }

    .workspace {
      grid-template-columns: 1fr;
      grid-template-rows: none;
      gap: 1rem;
    }

    .settings-panel {
      min-block-size: auto;
      overflow: visible;
      padding-block-end: 1.4rem;
    }

    .control-stack {
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 0;
      margin-block-start: 1.5rem;
    }

    .settings-section {
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1.2rem 1rem;
    }

    .settings-section + .settings-section {
      margin-block-start: 1.2rem;
      padding-block-start: 1.2rem;
    }

    .preview-panel {
      min-block-size: min(70dvh, 42rem);
    }
  }

  @media (max-width: 460px) {
    .settings-section {
      grid-template-columns: 1fr;
    }

    .control-stack {
      grid-template-columns: 1fr;
    }

    .export-dialog {
      inline-size: calc(100vw - 1rem);
      max-block-size: calc(100dvh - 1rem);
    }

    .export-dialog-content {
      max-block-size: calc(100dvh - 1rem);
      padding: 1rem;
    }

    .swatch-meta {
      inset-inline: 0.18rem;
      padding-inline: 0.22rem;
    }
  }

  @media (pointer: coarse) {
    .swatch-stack {
      grid-template-rows: repeat(var(--step-count), minmax(3.4rem, 1fr));
    }

    .swatch {
      min-block-size: 3.4rem;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .reset-button,
    .panel-action,
    .export-copy-button,
    .swatch,
    .swatch-meta,
    .curve-handle {
      transition: none;
    }
  }

  @media (prefers-contrast: more) {
    .settings-section + .settings-section,
    .settings-danger-zone {
      border-block-start-color: var(--text);
    }
  }

  @media (forced-colors: active) {
    .settings-section + .settings-section,
    .settings-danger-zone,
    .export-dialog,
    .export-json-preview {
      border-block-start-color: GrayText;
      border-color: GrayText;
    }

    .panel-action,
    .reset-button {
      border-color: ButtonText;
      background: ButtonFace;
      color: ButtonText;
    }

    .reset-button:hover {
      border-color: Highlight;
      background: Highlight;
      color: HighlightText;
    }

    .panel-action:hover,
    .export-copy-button:hover {
      border-color: Highlight;
      background: Highlight;
      color: HighlightText;
    }

    .swatch:focus-visible {
      outline-color: Highlight;
    }

    .swatch-alert {
      background: CanvasText;
      mix-blend-mode: normal;
    }
  }
}

@layer utilities {
  .visually-hidden {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
  }
}