/* keel v0.8.0
   The spine everything is built on. Five native cascade layers:
   tokens (the only layer where visual decisions live), base
   (zero-class content already looks designed), layout (full-bleed
   bands + curated structural classes), components (thin classes
   that consume tokens), utilities (a small token-bound utility
   surface — no arbitrary values, ever). Zero dependencies,
   zero JavaScript, mobile-first.
   Breakpoints (fixed, documented): sm 640px · md 820px · lg 1080px */

@layer tokens, base, layout, components, utilities;

/* ------------------------------------------------------------ */
@layer tokens {
  :root {
    /* color — normally generated by the design system tool */
    --k-bg: hsl(228 20% 98.5%);
    --k-surface: hsl(0 0% 100%);
    --k-surface-2: hsl(228 18% 95%);
    --k-border: hsl(228 14% 87%);
    --k-border-strong: hsl(228 14% 76%);
    --k-text: hsl(228 22% 14%);
    --k-text-soft: hsl(228 12% 36%);
    --k-text-faint: hsl(228 9% 52%);
    --k-accent: hsl(231 84% 56%);
    --k-on-accent: hsl(0 0% 100%);
    --k-accent-2: hsl(351 72% 44%);
    --k-on-accent-2: hsl(0 0% 100%);
    --k-accent-3: hsl(174 70% 28%);
    --k-on-accent-3: hsl(0 0% 100%);

    /* color relationships — every shade DERIVES from its seed via
       color-mix(). Override --k-accent alone and strong, light, soft,
       and the transparencies all follow. (on-accent stays explicit:
       contrast is a judgment the math below can't make safely.) */
    --k-accent-strong: color-mix(in oklab, var(--k-accent), black 20%);
    --k-accent-light: color-mix(in oklab, var(--k-accent), white 25%);
    --k-accent-soft: color-mix(in oklab, var(--k-accent) 12%, var(--k-bg));
    --k-accent-trans-10: color-mix(in srgb, var(--k-accent) 10%, transparent);
    --k-accent-trans-20: color-mix(in srgb, var(--k-accent) 20%, transparent);
    --k-accent-2-strong: color-mix(in oklab, var(--k-accent-2), black 20%);
    --k-accent-2-light: color-mix(in oklab, var(--k-accent-2), white 25%);
    --k-accent-2-soft: color-mix(in oklab, var(--k-accent-2) 12%, var(--k-bg));
    --k-accent-2-trans-10: color-mix(in srgb, var(--k-accent-2) 10%, transparent);
    --k-accent-2-trans-20: color-mix(in srgb, var(--k-accent-2) 20%, transparent);
    --k-accent-3-strong: color-mix(in oklab, var(--k-accent-3), black 20%);
    --k-accent-3-light: color-mix(in oklab, var(--k-accent-3), white 25%);
    --k-accent-3-soft: color-mix(in oklab, var(--k-accent-3) 12%, var(--k-bg));
    --k-accent-3-trans-10: color-mix(in srgb, var(--k-accent-3) 10%, transparent);
    --k-accent-3-trans-20: color-mix(in srgb, var(--k-accent-3) 20%, transparent);
    /* gradients derive from both seeds — always on-brand */
    --k-gradient: linear-gradient(135deg, var(--k-accent), var(--k-accent-2));
    --k-gradient-soft: linear-gradient(135deg, var(--k-accent-soft), var(--k-accent-2-soft));

    /* status */
    --k-ok: hsl(152 60% 30%);
    --k-warn: hsl(38 92% 34%);
    --k-danger: hsl(4 74% 42%);

    /* type */
    --k-font-display: system-ui, "Segoe UI", sans-serif;
    --k-font-body: system-ui, "Segoe UI", sans-serif;
    --k-font-mono: ui-monospace, Consolas, "Cascadia Mono", monospace;
    --k-display-weight: 650;
    --k-tracking: -0.015em;
    --k-leading: 1.65;
    --k-leading-tight: 1.12;

    /* type scale — fluid by default: every step is a clamp() that
       breathes with the viewport, no breakpoint declarations */
    --k-text-xs: clamp(0.78rem, 0.75rem + 0.15vw, 0.84rem);
    --k-text-s: clamp(0.88rem, 0.85rem + 0.18vw, 0.95rem);
    --k-text-m: clamp(1rem, 0.96rem + 0.22vw, 1.1rem);
    --k-text-l: clamp(1.15rem, 1.06rem + 0.45vw, 1.35rem);
    --k-text-xl: clamp(1.4rem, 1.22rem + 0.9vw, 1.8rem);
    --k-text-2xl: clamp(1.8rem, 1.48rem + 1.6vw, 2.5rem);
    --k-text-3xl: clamp(2.4rem, 1.9rem + 2.6vw, 3.6rem);

    /* space — density is the tool's knob */
    --k-density: 1;
    --k-space-1: calc(0.25rem * var(--k-density));
    --k-space-2: calc(0.5rem * var(--k-density));
    --k-space-3: calc(0.75rem * var(--k-density));
    --k-space-4: calc(1rem * var(--k-density));
    /* steps 5-8 are fluid — section rhythm scales with the viewport */
    --k-space-5: calc(clamp(1.4rem, 1.2rem + 0.9vw, 2rem) * var(--k-density));
    --k-space-6: calc(clamp(2.25rem, 1.85rem + 1.8vw, 3.4rem) * var(--k-density));
    --k-space-7: calc(clamp(3.25rem, 2.5rem + 3.5vw, 5.5rem) * var(--k-density));
    --k-space-8: calc(clamp(4.5rem, 3.3rem + 5.5vw, 8rem) * var(--k-density));

    /* one control rhythm: buttons and inputs share vertical padding */
    --k-control-py: calc(var(--k-space-2) * 1.2);

    /* shape — corner is the tool's knob */
    --k-radius-s: calc(var(--k-radius) * 0.5);
    --k-radius: 8px;
    --k-radius-l: calc(var(--k-radius) * 1.75);

    /* container widths — one knob per band. --k-gutter drives the
       margin-based container (fluid side margins, no max-width). */
    /* narrow = prose measure · default = 1152px · wide = 1440px,
       sized for today's 1440-1920+ desktop viewports. All tokens —
       retune per site. */
    --k-width-narrow: 46rem;
    --k-width: 72rem;
    --k-width-wide: 90rem;
    --k-gutter: clamp(1.25rem, 5vw, 5rem);

    /* elevation — layered, quiet; strength grows with level */
    --k-shadow-s: 0 1px 2px hsl(228 35% 12% / 0.05);
    --k-shadow: 0 1px 2px hsl(228 35% 12% / 0.04),
                0 6px 18px -8px hsl(228 35% 12% / 0.10);
    --k-shadow-l: 0 2px 6px hsl(228 35% 12% / 0.05),
                  0 22px 44px -18px hsl(228 35% 12% / 0.20);
    --k-ease: 160ms ease;
    --k-anim-duration: 450ms;
    --k-anim-delay: 0ms;
  }

  /* auto dark — OPT-IN: <html data-k-auto-dark>. When the visitor's
     OS prefers dark, the neutral seeds flip to a night set; every
     derived shade follows via the color relationships. Sites with a
     designed dark theme should ship their own tokens instead. */
  @media (prefers-color-scheme: dark) {
    :root[data-k-auto-dark] {
      color-scheme: dark;
      --k-bg: hsl(228 18% 10%);
      --k-surface: hsl(230 17% 14%);
      --k-surface-2: hsl(232 17% 19%);
      --k-border: hsl(228 14% 24%);
      --k-border-strong: hsl(228 14% 35%);
      --k-text: hsl(228 10% 93%);
      --k-text-soft: hsl(228 9% 72%);
      --k-text-faint: hsl(228 8% 57%);
      --k-accent: hsl(231 84% 68%);
      --k-on-accent: hsl(228 50% 8%);
      --k-accent-2: hsl(351 80% 70%);
      --k-on-accent-2: hsl(228 50% 8%);
      --k-accent-3: hsl(174 60% 58%);
      --k-on-accent-3: hsl(200 45% 8%);
      --k-ok: hsl(152 45% 58%);
      --k-warn: hsl(40 80% 60%);
      --k-danger: hsl(4 70% 62%);
    }
  }

  /* flat — opt-in minimal skin: <html data-k-flat>. Strips elevation
     to a thin, borders-only look; combine with the corners knob
     (--k-radius) and density for the full range from designed to bare.
     A separate axis from color, so it works with any mood or theme. */
  :root[data-k-flat] {
    --k-shadow-s: none;
    --k-shadow: none;
    --k-shadow-l: none;
    --k-surface-2: color-mix(in oklab, var(--k-surface), var(--k-border) 40%);
  }
}

/* ------------------------------------------------------------ */
@layer base {
  *, *::before, *::after { box-sizing: border-box; }
  [hidden] { display: none !important; }

  html { color-scheme: light; }
  /* auto dark opt-in must win here too — this layer beats tokens */
  @media (prefers-color-scheme: dark) {
    :root[data-k-auto-dark] { color-scheme: dark; }
  }
  @media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
  }
  [id] { scroll-margin-top: var(--k-space-5); }

  body {
    margin: 0;
    background: var(--k-bg);
    color: var(--k-text);
    font-family: var(--k-font-body);
    font-size: var(--k-text-m);
    line-height: var(--k-leading);
    -webkit-text-size-adjust: 100%;
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--k-font-display);
    font-weight: var(--k-display-weight);
    letter-spacing: var(--k-tracking);
    line-height: var(--k-leading-tight);
    margin: 0 0 var(--k-space-3);
    text-wrap: balance;
  }
  h1 { font-size: var(--k-text-3xl); }
  h2 { font-size: var(--k-text-2xl); }
  h3 { font-size: var(--k-text-xl); }
  h4 { font-size: var(--k-text-l); }

  p, ul, ol, dl { margin: 0 0 var(--k-space-4); }
  p { text-wrap: pretty; }

  /* smart content spacing — a heading that follows content gets room
     to breathe, automatically, with no classes */
  :is(p, ul, ol, dl, table, pre, figure, blockquote, details) + :is(h2, h3, h4) {
    margin-top: var(--k-space-6);
  }
  ul, ol { padding-inline-start: 1.4em; }
  li + li { margin-top: var(--k-space-1); }

  dt { font-weight: 650; }
  dd { margin: 0 0 var(--k-space-2); color: var(--k-text-soft); }

  a {
    color: var(--k-accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
    transition: color var(--k-ease);
  }
  a:hover { color: var(--k-accent-strong); }

  strong { font-weight: 650; }
  small { font-size: var(--k-text-s); color: var(--k-text-soft); }
  mark { background: var(--k-accent-soft); color: inherit;
         padding: 0 0.2em; border-radius: 2px; }
  /* highlight system — mark the terms a skimmer must catch. Use the
     semantic <mark>, or .k-mark on any inline element; the variants
     compose. Every tone follows your tokens, so highlights re-theme. */
  .k-mark { background: var(--k-accent-soft); color: inherit; padding: 0 0.2em; border-radius: 2px; }
  mark.k-mark--ok, .k-mark--ok { background: color-mix(in oklab, var(--k-ok) 20%, var(--k-surface)); }
  mark.k-mark--warn, .k-mark--warn { background: color-mix(in oklab, var(--k-warn) 26%, var(--k-surface)); }
  mark.k-mark--danger, .k-mark--danger { background: color-mix(in oklab, var(--k-danger) 18%, var(--k-surface)); }
  /* underline highlighter — a thick line behind the text, no box */
  mark.k-mark--line, .k-mark--line {
    background: linear-gradient(var(--k-accent-soft), var(--k-accent-soft)) 0 88% / 100% 0.35em no-repeat;
    padding: 0; border-radius: 0;
  }
  /* solid — the strongest highlight */
  mark.k-mark--solid, .k-mark--solid { background: var(--k-accent); color: var(--k-on-accent); }
  /* key term — bold accent, no background, for inline emphasis */
  .k-key { color: var(--k-accent-strong); font-weight: 650; }

  blockquote {
    margin: var(--k-space-5) 0;
    padding: var(--k-space-2) var(--k-space-5);
    border-inline-start: 3px solid var(--k-accent);
    color: var(--k-text-soft);
    font-size: var(--k-text-l);
  }
  blockquote > :last-child { margin-bottom: 0; }

  code, kbd {
    font-family: var(--k-font-mono);
    font-size: 0.9em;
    background: var(--k-surface-2);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-s);
    padding: 0.1em 0.35em;
  }
  kbd { border-bottom-width: 2px; }
  pre {
    font-family: var(--k-font-mono);
    font-size: var(--k-text-s);
    line-height: 1.55;
    background: var(--k-surface-2);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius);
    padding: var(--k-space-4);
    overflow-x: auto;
    margin: 0 0 var(--k-space-4);
  }
  pre code { background: none; border: 0; padding: 0; font-size: inherit; }

  hr {
    border: 0;
    border-top: 1px solid var(--k-border);
    margin: var(--k-space-6) 0;
  }

  img, video { max-width: 100%; height: auto; border-radius: var(--k-radius); }
  figure { margin: 0 0 var(--k-space-4); }
  figcaption { font-size: var(--k-text-s); color: var(--k-text-faint); margin-top: var(--k-space-2); }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--k-text-s);
    font-variant-numeric: tabular-nums;
    margin: 0 0 var(--k-space-4);
  }
  caption {
    text-align: start; font-weight: 650;
    color: var(--k-text-soft);
    padding-block-end: var(--k-space-2);
  }
  tfoot td {
    border-block-start: 2px solid var(--k-border-strong);
    border-block-end: 0;
    font-weight: 650;
  }
  th, td {
    text-align: left;
    padding: var(--k-space-2) var(--k-space-3);
    border-bottom: 1px solid var(--k-border);
  }
  th { font-weight: 650; color: var(--k-text-soft); font-size: var(--k-text-xs);
       text-transform: uppercase; letter-spacing: 0.06em; }

  /* forms */
  label { display: block; font-size: var(--k-text-s); font-weight: 600;
          margin-bottom: var(--k-space-1); }
  input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="color"]),
  select, textarea {
    width: 100%;
    font: inherit;
    color: inherit;
    background: var(--k-surface);
    border: 1px solid var(--k-border-strong);
    border-radius: var(--k-radius);
    padding: var(--k-control-py) var(--k-space-3);
    box-shadow: inset 0 1px 2px hsl(0 0% 0% / 0.03);
    transition: border-color var(--k-ease), box-shadow var(--k-ease);
  }
  input:hover, select:hover, textarea:hover { border-color: var(--k-text-faint); }
  input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: none;
    border-color: var(--k-accent);
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }
  ::placeholder { color: var(--k-text-faint); }

  /* control states */
  input[disabled], select[disabled], textarea[disabled] {
    background: var(--k-surface-2); color: var(--k-text-faint);
    cursor: not-allowed; opacity: 0.8;
  }
  input[readonly]:not([type="checkbox"]):not([type="radio"]), textarea[readonly] {
    background: var(--k-surface-2); border-style: dashed;
  }
  select[multiple] { padding: var(--k-space-1); block-size: auto; }
  select[multiple] option { padding: var(--k-space-1) var(--k-space-2);
                            border-radius: var(--k-radius-s); }

  meter {
    inline-size: 100%; block-size: 0.7rem;
  }
  meter::-webkit-meter-bar { background: var(--k-surface-2);
    border: 1px solid var(--k-border); border-radius: 999px; block-size: 0.7rem; }
  meter::-webkit-meter-optimum-value { background: var(--k-ok); border-radius: 999px; }
  meter::-webkit-meter-suboptimum-value { background: var(--k-warn); border-radius: 999px; }
  meter::-webkit-meter-even-less-good-value { background: var(--k-danger); border-radius: 999px; }
  meter::-moz-meter-bar { border-radius: 999px; }

  /* validation — only after the user has interacted (:user-*) */
  input:user-invalid, select:user-invalid, textarea:user-invalid {
    border-color: var(--k-danger);
  }
  input:user-invalid:focus-visible, select:user-invalid:focus-visible,
  textarea:user-invalid:focus-visible {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--k-danger) 18%, transparent);
  }
  input:user-valid:not([type="checkbox"]):not([type="radio"]),
  select:user-valid, textarea:user-valid {
    border-color: var(--k-ok);
  }

  select {
    appearance: none;
    padding-inline-end: 2.6em;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%238a8f98' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--k-space-3) center;
    background-size: 0.7em;
  }
  textarea { resize: vertical; min-height: 5.5em; }
  /* auto-growing textarea — modern CSS, no JS; older browsers just
     keep the resize handle */
  @supports (field-sizing: content) {
    textarea { field-sizing: content; max-block-size: 24rem; }
  }
  input[type="checkbox"], input[type="radio"] {
    accent-color: var(--k-accent);
    inline-size: 1.05rem; block-size: 1.05rem;
  }

  /* range — fully styled slider. Track color is a knob so tools can
     paint gradients: --k-range-track */
  input[type="range"] {
    appearance: none; -webkit-appearance: none;
    inline-size: 100%; block-size: 1.2rem;
    background: none; margin: 0; cursor: pointer;
  }
  input[type="range"]::-webkit-slider-runnable-track {
    block-size: 0.55rem; border-radius: 999px;
    background: var(--k-range-track, var(--k-surface-2));
    border: 1px solid var(--k-border);
  }
  input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none;
    inline-size: 1.15rem; block-size: 1.15rem;
    margin-block-start: calc((0.55rem - 1.15rem) / 2 - 1px);
    border-radius: 50%;
    background: var(--k-accent);
    border: 2px solid var(--k-surface);
    box-shadow: var(--k-shadow-s);
  }
  input[type="range"]::-moz-range-track {
    block-size: 0.55rem; border-radius: 999px;
    background: var(--k-range-track, var(--k-surface-2));
    border: 1px solid var(--k-border);
  }
  input[type="range"]::-moz-range-thumb {
    inline-size: 1rem; block-size: 1rem; border-radius: 50%;
    background: var(--k-accent); border: 2px solid var(--k-surface);
  }
  input[type="range"]:focus-visible {
    outline: none;
  }
  input[type="range"]:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }
  input[type="range"]:focus-visible::-moz-range-thumb {
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }

  /* color input — the swatch is ours; the popup is the OS's */
  input[type="color"] {
    inline-size: 3rem; block-size: 2.2rem; padding: 2px;
    background: var(--k-surface);
    border: 1px solid var(--k-border-strong);
    border-radius: var(--k-radius-s);
    cursor: pointer;
  }
  input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
  input[type="color"]::-webkit-color-swatch {
    border: 0; border-radius: calc(var(--k-radius-s) - 2px);
  }
  input[type="color"]::-moz-color-swatch {
    border: 0; border-radius: calc(var(--k-radius-s) - 2px);
  }

  ::-webkit-calendar-picker-indicator { opacity: 0.65; cursor: pointer;
    border-radius: var(--k-radius-s); padding: 2px; }
  ::-webkit-calendar-picker-indicator:hover { opacity: 1; background: var(--k-accent-soft); }
  fieldset { border: 1px solid var(--k-border); border-radius: var(--k-radius);
             padding: var(--k-space-4); margin: 0 0 var(--k-space-4); }
  legend { font-weight: 650; font-size: var(--k-text-s); padding: 0 var(--k-space-2); }

  input[type="file"] { font-size: var(--k-text-s); color: var(--k-text-soft); }
  ::file-selector-button {
    font: inherit; font-size: var(--k-text-s); font-weight: 650;
    color: var(--k-accent-strong); background: var(--k-accent-soft);
    border: 0; border-radius: var(--k-radius-s);
    padding: var(--k-space-1) var(--k-space-3);
    margin-inline-end: var(--k-space-3);
    cursor: pointer;
  }

  progress {
    width: 100%; height: 0.6rem;
    appearance: none; border: 0;
    background: var(--k-surface-2);
    border-radius: 999px; overflow: hidden;
  }
  progress::-webkit-progress-bar { background: var(--k-surface-2); }
  progress::-webkit-progress-value { background: var(--k-accent); }
  progress::-moz-progress-bar { background: var(--k-accent); }

  details {
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius);
    padding: var(--k-space-3) var(--k-space-4);
    margin: 0 0 var(--k-space-3);
  }
  summary {
    cursor: pointer; font-weight: 650;
    list-style: none;
    display: flex; align-items: baseline; gap: var(--k-space-2);
  }
  summary::-webkit-details-marker { display: none; }
  summary::before {
    content: "▸"; color: var(--k-accent);
    transition: rotate var(--k-ease); flex: none;
  }
  details[open] summary { margin-bottom: var(--k-space-3); }
  details[open] summary::before { rotate: 90deg; }
  /* animated open/close — interpolate-size lets height: auto
     transition; progressive (Chromium today), instant elsewhere */
  @supports (interpolate-size: allow-keywords) {
    details { interpolate-size: allow-keywords; }
    details::details-content {
      block-size: 0; overflow-y: clip;
      transition: block-size var(--k-ease), content-visibility var(--k-ease) allow-discrete;
    }
    details[open]::details-content { block-size: auto; }
  }

  dialog, [popover] {
    background: var(--k-surface); color: var(--k-text);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-l);
    box-shadow: var(--k-shadow);
    padding: var(--k-space-5);
    max-width: min(90vw, 32rem);
  }
  dialog > :last-child, [popover] > :last-child { margin-bottom: 0; }

  /* overlay motion — native, smooth, and it degrades to a plain
     show/hide in browsers without @starting-style */
  dialog, [popover] {
    opacity: 0; translate: 0 0.5rem;
    transition: opacity var(--k-ease), translate var(--k-ease),
                overlay var(--k-ease) allow-discrete,
                display var(--k-ease) allow-discrete;
  }
  dialog[open], :popover-open { opacity: 1; translate: 0 0; }
  @starting-style {
    dialog[open], :popover-open { opacity: 0; translate: 0 0.5rem; }
  }
  dialog::backdrop {
    background: hsl(0 0% 0% / 0);
    transition: background var(--k-ease),
                overlay var(--k-ease) allow-discrete,
                display var(--k-ease) allow-discrete;
  }
  dialog[open]::backdrop { background: hsl(0 0% 0% / 0.45); }
  @starting-style {
    dialog[open]::backdrop { background: hsl(0 0% 0% / 0); }
  }

  :focus-visible { outline: 2px solid var(--k-accent); outline-offset: 2px; }
  ::selection { background: var(--k-accent); color: var(--k-on-accent); }

  /* skip link — hidden until focused, then slides in from the top.
     Pair with an element that has id="main". */
  .k-skip-link {
    position: fixed; inset-block-start: 0; inset-inline-start: 0; z-index: 100;
    margin: var(--k-space-2); padding: var(--k-space-2) var(--k-space-3);
    background: var(--k-accent); color: var(--k-on-accent);
    border-radius: var(--k-radius-s); font-weight: 600; text-decoration: none;
    transform: translateY(-200%);
  }
  .k-skip-link:focus { transform: translateY(0); }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
  }

  /* print — ink-friendly, chrome removed */
  @media print {
    :root { --k-bg: #fff; --k-text: #000; }
    body { background: #fff; color: #000; }
    .k-fab, [popover], dialog, .docs-search-btn { display: none !important; }
    .k-section--accent, .k-section--gradient, .k-section--tint,
    .k-section--tint-2, .k-section--alt { background: #fff; color: #000; }
    a { color: #000; }
    .k-card, .k-panel { box-shadow: none; break-inside: avoid; }
    pre { white-space: pre-wrap; word-break: break-word; }
  }
}

/* ------------------------------------------------------------ */
@layer layout {
  /* Full-bleed-first: the page spans the viewport, sections are
     full-width bands, an inner container constrains per band. */
  .k-section { padding-block: var(--k-section-pad, var(--k-space-7)); }
  .k-section--tight { --k-section-pad: var(--k-space-6); }
  .k-section--alt { background: var(--k-surface); border-block: 1px solid var(--k-border); }
  .k-section--tint { background: var(--k-accent-soft); }
  .k-section--tint-2 { background: var(--k-accent-2-soft); }
  .k-section--tint-3 { background: var(--k-accent-3-soft); }
  .k-section--accent { background: var(--k-accent); color: var(--k-on-accent); }
  .k-section--accent a { color: inherit; }
  /* gradient band — text uses --k-on-accent; if your secondary flips
     polarity (light on dark vs dark on light), retune before shipping */
  .k-section--gradient { background: var(--k-gradient); color: var(--k-on-accent); }
  .k-section--gradient a { color: inherit; }
  .k-section--gradient :focus-visible { outline-color: var(--k-on-accent); }
  /* accent-colored focus/selection would vanish on the accent band */
  .k-section--accent :focus-visible { outline-color: var(--k-on-accent); }
  .k-section--accent ::selection { background: var(--k-on-accent); color: var(--k-accent); }

  .k-container {
    width: min(100% - 3rem, var(--k-width));
    margin-inline: auto;
  }
  .k-container--narrow { width: min(100% - 3rem, var(--k-width-narrow)); }
  .k-container--wide { width: min(100% - 3rem, var(--k-width-wide)); }
  .k-container--full { width: 100%; padding-inline: var(--k-space-4); }
  /* margin-based: fluid side gutters, no width cap — for bands that
     should use the whole screen gracefully */
  .k-container--gutter { width: calc(100% - 2 * var(--k-gutter)); }

  /* structural, never positional */
  .k-stack { display: flex; flex-direction: column; gap: var(--k-space-4); }
  .k-stack > * { margin-block: 0; }
  .k-stack--loose { gap: var(--k-space-6); }
  .k-stack--tight { gap: var(--k-space-2); }

  /* owl spacing — margin between siblings, tunable per use:
     <div class="k-flow" style="--k-flow: var(--k-space-6)"> */
  .k-flow > * { margin-block: 0; }
  .k-flow > * + * { margin-block-start: var(--k-flow, var(--k-space-4)); }

  .k-cluster { display: flex; flex-wrap: wrap; gap: var(--k-space-3); align-items: center; }
  .k-center { text-align: center; }

  .k-split, .k-thirds { display: grid; gap: var(--k-space-6); }
  .k-grid { display: grid; gap: var(--k-space-4);
            grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }

  .k-cols-2, .k-cols-3, .k-cols-4 { display: grid; gap: var(--k-space-4); }

  /* bento — a dense feature grid: uniform cells with a few spanning
     stars. Cells are your own markup (cards work well). Modifiers set
     the spans; dense flow backfills the gaps. Single column on phones. */
  .k-bento { display: grid; gap: var(--k-space-4);
             grid-auto-rows: minmax(9rem, auto); grid-auto-flow: dense; }
  .k-bento > * { min-inline-size: 0; }

  .k-sidebar { display: grid; gap: var(--k-space-5); }

  .k-sticky { position: sticky; top: var(--k-space-4); align-self: start; }

  .k-frame { aspect-ratio: 16 / 9; overflow: hidden; border-radius: var(--k-radius); }
  .k-frame > img, .k-frame > video, .k-frame > iframe {
    inline-size: 100%; block-size: 100%; object-fit: cover; border-radius: 0; border: 0;
  }
  .k-frame--square { aspect-ratio: 1; }
  .k-frame--4x3 { aspect-ratio: 4 / 3; }
  .k-frame--portrait { aspect-ratio: 3 / 4; }

  @media (min-width: 640px) {
    .k-thirds { grid-template-columns: repeat(3, 1fr); }
    .k-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .k-cols-3 { grid-template-columns: repeat(3, 1fr); }
    .k-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .k-bento { grid-template-columns: repeat(2, 1fr); }
    .k-bento__wide { grid-column: span 2; }
    .k-bento__tall { grid-row: span 2; }
    .k-bento__hero { grid-column: span 2; grid-row: span 2; }
  }
  @media (min-width: 820px) {
    .k-split { grid-template-columns: 1fr 1fr; align-items: start; }
    .k-split--wide-start { grid-template-columns: 1.6fr 1fr; }
    .k-sidebar { grid-template-columns: minmax(14rem, 1fr) 3fr; align-items: start; }
  }
  @media (min-width: 1080px) {
    .k-cols-4 { grid-template-columns: repeat(4, 1fr); }
    .k-bento { grid-template-columns: repeat(4, 1fr); }
  }
}

/* ------------------------------------------------------------ */
@layer components {
  /* Every component reads local knobs (--k-btn-*) with token
     defaults. A custom variant is a few lines of plain CSS:
       .btn-sale { --k-btn-bg: var(--k-warn);
                   --k-btn-bg-hover: color-mix(in oklab, var(--k-warn), black 15%); }
     This is keel's mixin system — native, no build step. */
  .k-btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: var(--k-space-2);
    font: inherit; font-weight: 650; font-size: var(--k-text-s);
    line-height: 1.2;
    color: var(--k-btn-fg, var(--k-on-accent));
    background: var(--k-btn-bg, var(--k-accent));
    border: 1px solid var(--k-btn-border, transparent);
    border-radius: var(--k-btn-radius, var(--k-radius));
    padding: var(--k-control-py) var(--k-space-4);
    text-decoration: none;
    cursor: pointer;
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.08);
    transition: background var(--k-ease), border-color var(--k-ease),
                color var(--k-ease), translate var(--k-ease),
                box-shadow var(--k-ease);
  }
  .k-btn:hover {
    background: var(--k-btn-bg-hover, var(--k-accent-strong));
    color: var(--k-btn-fg, var(--k-on-accent));
  }
  .k-btn:active { translate: 0 1px; }
  .k-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--k-accent-trans-20), 0 1px 2px hsl(0 0% 0% / 0.08);
  }
  /* flat skin: drop the button's own drop-shadow, keep the focus ring */
  :root[data-k-flat] .k-btn { box-shadow: none; }
  :root[data-k-flat] .k-btn:focus-visible { box-shadow: 0 0 0 3px var(--k-accent-trans-20); }
  .k-btn--ghost {
    --k-btn-bg: transparent; --k-btn-fg: var(--k-text);
    --k-btn-border: var(--k-border-strong);
    --k-btn-bg-hover: var(--k-surface-2);
    box-shadow: none;
  }
  .k-btn--ghost:hover { border-color: var(--k-text-faint); }
  .k-btn--soft {
    --k-btn-bg: var(--k-accent-soft); --k-btn-fg: var(--k-accent-strong);
    --k-btn-bg-hover: var(--k-accent-soft);
    box-shadow: none;
  }
  .k-btn--soft:hover { --k-btn-fg: var(--k-accent); }
  .k-btn--secondary {
    --k-btn-bg: var(--k-accent-2); --k-btn-fg: var(--k-on-accent-2);
    --k-btn-bg-hover: var(--k-accent-2-strong);
  }
  .k-btn--tertiary {
    --k-btn-bg: var(--k-accent-3); --k-btn-fg: var(--k-on-accent-3);
    --k-btn-bg-hover: var(--k-accent-3-strong);
  }
  .k-btn--danger {
    --k-btn-bg: var(--k-danger); --k-btn-fg: hsl(0 0% 100%);
    --k-btn-bg-hover: color-mix(in oklab, var(--k-danger), black 15%);
  }
  .k-btn--small { padding: var(--k-space-1) var(--k-space-3); font-size: var(--k-text-xs); }
  .k-btn--large { padding: var(--k-space-3) var(--k-space-5); font-size: var(--k-text-m); }
  .k-btn--link {
    --k-btn-bg: transparent; --k-btn-fg: var(--k-accent);
    --k-btn-bg-hover: transparent;
    box-shadow: none; padding-inline: var(--k-space-1);
    text-decoration: underline; text-underline-offset: 0.2em;
  }
  .k-btn--link:hover { --k-btn-fg: var(--k-accent-strong); }
  .k-btn--icon { padding: var(--k-space-2); aspect-ratio: 1; justify-content: center; }
  .k-btn--pill { --k-btn-radius: 999px; }
  .k-btn--block { display: flex; inline-size: 100%; }
  .k-btn[disabled] { opacity: 0.55; cursor: not-allowed; }
  .k-btn[aria-busy="true"] { opacity: 0.7; pointer-events: none; }

  .k-card {
    background: var(--k-card-bg, var(--k-surface));
    border: 1px solid var(--k-card-border, var(--k-border));
    border-radius: var(--k-card-radius, var(--k-radius-l));
    padding: var(--k-card-pad, var(--k-space-5));
    box-shadow: var(--k-shadow);
  }
  .k-card > :last-child { margin-bottom: 0; }
  .k-card--flat { box-shadow: none; }
  .k-card--tint { --k-card-bg: var(--k-accent-soft); --k-card-border: transparent; box-shadow: none; }
  .k-card--pad-sm { --k-card-pad: var(--k-space-3); }
  .k-card--pad-lg { --k-card-pad: var(--k-space-7); }
  .k-card--accent { border-block-start: 3px solid var(--k-accent); }
  .k-card--row {
    display: flex; gap: var(--k-space-5); align-items: flex-start;
    padding: var(--k-card-pad, var(--k-space-4));
  }
  .k-card--row > :last-child { margin-bottom: 0; }
  @media (max-width: 40rem) {
    .k-card--row { flex-direction: column; }
  }
  .k-card--hover {
    transition: translate var(--k-ease), box-shadow var(--k-ease),
                border-color var(--k-ease);
  }
  .k-card--hover:hover {
    translate: 0 -3px;
    border-color: var(--k-border-strong);
    box-shadow: 0 2px 4px hsl(228 20% 20% / 0.06),
                0 16px 32px -16px hsl(228 20% 20% / 0.24);
  }
  .k-card__kicker {
    font-family: var(--k-font-mono); font-size: var(--k-text-xs);
    letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--k-accent); margin-bottom: var(--k-space-2);
  }

  .k-badge {
    display: inline-block;
    font-size: var(--k-text-xs); font-weight: 650;
    background: var(--k-badge-bg, var(--k-accent-soft));
    color: var(--k-badge-fg, var(--k-accent-strong));
    border-radius: 999px;
    padding: 0.15em 0.75em;
  }
  .k-badge--outline { --k-badge-bg: transparent; --k-badge-fg: var(--k-text-soft);
                      border: 1px solid var(--k-border-strong); }
  .k-badge--secondary { --k-badge-bg: var(--k-accent-2-soft); --k-badge-fg: var(--k-accent-2-strong); }
  .k-badge--tertiary { --k-badge-bg: var(--k-accent-3-soft); --k-badge-fg: var(--k-accent-3-strong); }
  .k-badge--ok { --k-badge-bg: var(--k-ok); --k-badge-fg: hsl(0 0% 100%); }
  .k-badge--warn { --k-badge-bg: var(--k-warn); --k-badge-fg: hsl(0 0% 100%); }
  .k-badge--danger { --k-badge-bg: var(--k-danger); --k-badge-fg: hsl(0 0% 100%); }
  .k-badge--solid { --k-badge-bg: var(--k-accent); --k-badge-fg: var(--k-on-accent); }
  .k-badge--large { font-size: var(--k-text-s); padding: 0.25em 0.9em; }
  .k-badge--dot { display: inline-flex; align-items: center; gap: 0.5em; }
  .k-badge--dot::before {
    content: ""; inline-size: 0.5em; block-size: 0.5em;
    border-radius: 50%; background: currentColor; opacity: 0.9;
  }

  .k-alert {
    display: flex; gap: var(--k-space-3);
    background: var(--k-alert-bg, var(--k-surface));
    border: 1px solid var(--k-border);
    border-inline-start: 3px solid var(--k-alert-edge, var(--k-accent));
    border-radius: var(--k-radius);
    padding: var(--k-space-3) var(--k-space-4);
    font-size: var(--k-text-s);
  }
  .k-alert > :last-child { margin-bottom: 0; }
  .k-alert--ok { --k-alert-edge: var(--k-ok); }
  .k-alert--warn { --k-alert-edge: var(--k-warn); }
  .k-alert--danger { --k-alert-edge: var(--k-danger); }
  /* soft: tint the whole surface from the edge color, borderless */
  .k-alert--soft {
    --k-alert-bg: color-mix(in oklab, var(--k-alert-edge, var(--k-accent)) 12%, var(--k-surface));
    border-color: transparent;
  }

  .k-nav {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--k-space-4); flex-wrap: wrap;
    padding-block: var(--k-space-3);
  }
  .k-nav__brand {
    font-family: var(--k-font-mono); font-weight: 700;
    font-size: var(--k-text-l); letter-spacing: -0.02em;
    color: var(--k-text); text-decoration: none;
  }
  .k-nav__links { display: flex; flex-wrap: wrap; align-items: center;
                  gap: var(--k-space-1) var(--k-space-4);
                  list-style: none; margin: 0; padding: 0; font-size: var(--k-text-s); }
  .k-nav__links > li { margin: 0; }
  .k-nav__links a {
    display: inline-block; padding-block: var(--k-space-1);
    color: var(--k-text-soft); text-decoration: none;
    border-block-end: 2px solid transparent;
    transition: color var(--k-ease), border-color var(--k-ease);
  }
  .k-nav__links a:hover { color: var(--k-text); }
  .k-nav__links a[aria-current="page"] {
    color: var(--k-text); font-weight: 650;
    border-block-end-color: var(--k-accent);
  }
  /* stacked nav — vertical links with a leading active bar (sidebars) */
  .k-nav--stack { align-items: stretch; }
  .k-nav--stack .k-nav__links { flex-direction: column; align-items: stretch; gap: 0; inline-size: 100%; }
  .k-nav--stack .k-nav__links a {
    padding: var(--k-space-2) var(--k-space-3);
    border-block-end: 0; border-inline-start: 2px solid transparent;
  }
  .k-nav--stack .k-nav__links a:hover { background: var(--k-surface-2); }
  .k-nav--stack .k-nav__links a[aria-current="page"] {
    border-inline-start-color: var(--k-accent); background: var(--k-accent-soft);
  }

  .k-hero { padding-block: var(--k-space-8); }
  .k-hero__eyebrow {
    font-family: var(--k-font-mono); font-size: var(--k-text-xs);
    letter-spacing: 0.16em; text-transform: uppercase;
    color: var(--k-accent); margin-bottom: var(--k-space-3);
  }
  .k-hero__lead { font-size: var(--k-text-l); color: var(--k-text-soft);
                  max-width: 38em; }
  .k-hero--center { text-align: center; }
  .k-hero--center .k-hero__lead { margin-inline: auto; }

  .k-field { margin-bottom: var(--k-space-4); }
  .k-field__hint { font-size: var(--k-text-xs); color: var(--k-text-faint);
                   margin-top: var(--k-space-1); }
  .k-field--inline { display: flex; align-items: center; gap: var(--k-space-3); }
  .k-field--inline > label { margin: 0; flex: none; }
  .k-field--required > label::after { content: " *"; color: var(--k-danger); }

  /* control sizes — on the control itself */
  .k-input--small { padding: var(--k-space-1) var(--k-space-2) !important;
                    font-size: var(--k-text-s) !important; }
  .k-input--large { padding: var(--k-space-3) var(--k-space-4) !important;
                    font-size: var(--k-text-l) !important; }

  /* form layout — rows that stack on mobile, split at md */
  .k-form-row { display: grid; gap: var(--k-space-4); }
  @media (min-width: 640px) {
    .k-form-row--2 { grid-template-columns: 1fr 1fr; }
    .k-form-row--3 { grid-template-columns: repeat(3, 1fr); }
  }

  /* form group / section — a titled group of fields. Use a real
     <fieldset> with a <legend> for grouped controls (radios, checkboxes)
     so the group is announced; .k-fieldset adds the styled frame + an
     optional description, and --plain makes a borderless settings
     section divided from the next. */
  .k-fieldset {
    border: 1px solid var(--k-border); border-radius: var(--k-radius-l);
    padding: var(--k-space-5); margin: 0 0 var(--k-space-5);
    min-inline-size: 0;
  }
  .k-fieldset > legend, .k-fieldset__title {
    font-family: var(--k-font-display); font-weight: 650;
    font-size: var(--k-text-m); letter-spacing: var(--k-tracking);
    padding: 0; margin: 0;
  }
  .k-fieldset__hint {
    font-size: var(--k-text-s); color: var(--k-text-soft);
    margin: var(--k-space-1) 0 var(--k-space-4); max-inline-size: 46em;
  }
  .k-fieldset > :last-child { margin-bottom: 0; }
  /* plain — no frame; a heading + a top rule between sections */
  .k-fieldset--plain {
    border: 0; border-radius: 0; padding: 0;
    padding-block-start: var(--k-space-6); margin-block-end: var(--k-space-6);
    border-block-start: 1px solid var(--k-border);
  }
  .k-fieldset--plain:first-of-type { border-block-start: 0; padding-block-start: 0; }

  /* split field — label + hint on the start, control on the end: the
     settings-page row. Stacks on small screens, splits at sm. */
  .k-field--split { display: grid; gap: var(--k-space-1) var(--k-space-5); }
  .k-field--split > :first-child { margin: 0; }
  @media (min-width: 640px) {
    .k-field--split {
      grid-template-columns: minmax(0, 1fr) minmax(0, 22rem);
      align-items: center;
    }
    .k-field--split .k-field__hint { grid-column: 1; margin-top: var(--k-space-1); }
  }

  .k-breadcrumb { list-style: none; display: flex; flex-wrap: wrap;
                  gap: var(--k-space-2); margin: 0 0 var(--k-space-4); padding: 0;
                  font-size: var(--k-text-s); }
  .k-breadcrumb li { margin: 0; display: flex; gap: var(--k-space-2); align-items: baseline; }
  .k-breadcrumb li + li::before { content: "/"; color: var(--k-text-faint); }
  .k-breadcrumb a { color: var(--k-text-soft); text-decoration: none; }
  .k-breadcrumb a:hover { color: var(--k-accent); }
  .k-breadcrumb [aria-current] { color: var(--k-text); font-weight: 650; }

  .k-pagination { list-style: none; display: flex; flex-wrap: wrap;
                  gap: var(--k-space-1); margin: 0; padding: 0; font-size: var(--k-text-s); }
  .k-pagination li { margin: 0; }
  .k-pagination a, .k-pagination span {
    display: inline-block; min-width: 2.1em; text-align: center;
    padding: var(--k-space-1) var(--k-space-2);
    border-radius: var(--k-radius-s); text-decoration: none;
    color: var(--k-text-soft);
  }
  .k-pagination a:hover { background: var(--k-surface-2); color: var(--k-text); }
  .k-pagination [aria-current="page"] { background: var(--k-accent); color: var(--k-on-accent); font-weight: 650; }

  .k-avatar {
    display: inline-grid; place-items: center;
    inline-size: 2.5rem; block-size: 2.5rem;
    border-radius: 50%; overflow: hidden;
    background: var(--k-accent-soft); color: var(--k-accent-strong);
    font-weight: 700; font-size: var(--k-text-s);
  }
  .k-avatar img { inline-size: 100%; block-size: 100%; object-fit: cover; border-radius: 0; }
  .k-avatar--small { inline-size: 1.8rem; block-size: 1.8rem; font-size: var(--k-text-xs); }
  .k-avatar--large { inline-size: 3.6rem; block-size: 3.6rem; font-size: var(--k-text-l); }
  .k-avatar--square { border-radius: var(--k-radius-s); }
  .k-avatar--ring { box-shadow: 0 0 0 2px var(--k-surface), 0 0 0 4px var(--k-avatar-ring, var(--k-accent)); }

  .k-media { display: flex; gap: var(--k-media-gap, var(--k-space-4)); align-items: flex-start; }
  .k-media > :first-child { flex: none; }
  .k-media__body > :last-child { margin-bottom: 0; }
  .k-media--center { align-items: center; }
  .k-media--reverse { flex-direction: row-reverse; }

  .k-stat__value { font-family: var(--k-font-display); font-weight: var(--k-display-weight);
                   font-size: var(--k-text-2xl); line-height: 1; letter-spacing: var(--k-tracking); }
  .k-stat__label { display: block; font-size: var(--k-text-xs); color: var(--k-text-faint);
                   text-transform: uppercase; letter-spacing: 0.08em; margin-top: var(--k-space-1); }
  .k-stat--center { text-align: center; }
  /* delta line under a stat — colored by direction */
  .k-stat__delta { display: inline-block; font-size: var(--k-text-xs); font-weight: 650;
                   margin-top: var(--k-space-1); }
  .k-stat__delta--up { color: var(--k-ok); }
  .k-stat__delta--down { color: var(--k-danger); }

  .k-table--striped tbody tr:nth-child(odd) td { background: var(--k-surface-2); }

  .k-switch input {
    appearance: none; margin: 0; cursor: pointer;
    inline-size: 2.6rem; block-size: 1.5rem;
    border-radius: 999px; background: var(--k-border-strong);
    position: relative; transition: background var(--k-ease);
  }
  .k-switch input::after {
    content: ""; position: absolute; inset-block: 3px; inset-inline-start: 3px;
    inline-size: calc(1.5rem - 6px); border-radius: 50%;
    background: hsl(0 0% 100%); transition: translate var(--k-ease);
  }
  .k-switch input:checked { background: var(--k-switch-on, var(--k-accent)); }
  .k-switch input:checked::after { translate: 1.1rem 0; }
  .k-switch input:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }
  /* success-tinted switch: --k-switch-on knob, e.g. an "active" toggle */
  .k-switch--ok input { --k-switch-on: var(--k-ok); }
  /* sizes — track/knob scale together, travel recomputed */
  .k-switch--small input { inline-size: 2rem; block-size: 1.15rem; }
  .k-switch--small input::after { inline-size: calc(1.15rem - 6px); }
  .k-switch--small input:checked::after { translate: 0.85rem 0; }
  .k-switch--large input { inline-size: 3.2rem; block-size: 1.85rem; }
  .k-switch--large input::after { inline-size: calc(1.85rem - 6px); }
  .k-switch--large input:checked::after { translate: 1.35rem 0; }

  .k-footer {
    border-top: 1px solid var(--k-border);
    padding-block: var(--k-space-6);
    font-size: var(--k-text-s); color: var(--k-text-faint);
  }

  /* surface effects — treatments any surface can wear.
     glass: frosted translucency (needs something behind it to show);
     falls back to a solid surface where backdrop-filter is missing */
  .k-glass {
    background: color-mix(in srgb, var(--k-surface) 62%, transparent);
    -webkit-backdrop-filter: blur(var(--k-blur, 14px)) saturate(1.5);
    backdrop-filter: blur(var(--k-blur, 14px)) saturate(1.5);
    border: 1px solid color-mix(in srgb, var(--k-surface) 40%, var(--k-border));
  }
  @supports not (backdrop-filter: blur(1px)) {
    .k-glass { background: var(--k-surface); }
  }
  /* glow: an accent halo — derived, so it's always on-brand */
  .k-glow {
    box-shadow: 0 0 0 1px var(--k-accent-trans-10),
                0 0 34px var(--k-accent-trans-20);
  }

  /* ---- application tier: builder/app chrome ---- */

  /* app shell — header row + rail | work | inspector columns.
     Panels collapse under the content on small screens. */
  .k-app {
    display: grid; min-block-size: 100dvh;
    grid-template-rows: auto 1fr auto;
    grid-template-areas: "head" "work" "foot";
    background: var(--k-bg);
  }
  .k-app__head { grid-area: head; }
  .k-app__rail { grid-area: rail; display: none; }
  .k-app__work { grid-area: work; min-inline-size: 0; min-block-size: 0; }
  .k-app__side { grid-area: side; display: none; }
  .k-app__foot { grid-area: foot; }
  @media (min-width: 1080px) {
    .k-app {
      grid-template-rows: auto 1fr auto;
      grid-template-columns: 16rem minmax(0, 1fr) 19rem;
      grid-template-areas: "head head head" "rail work side" "foot foot foot";
    }
    .k-app__rail, .k-app__side {
      display: block; overflow-y: auto;
      background: var(--k-surface);
    }
    .k-app__rail { border-inline-end: 1px solid var(--k-border); }
    .k-app__side { border-inline-start: 1px solid var(--k-border); }
  }

  /* toolbar — a strip of tools with groups and separators */
  .k-toolbar {
    display: flex; align-items: center; gap: var(--k-space-2);
    padding: var(--k-space-2) var(--k-space-3);
    background: var(--k-surface);
    border-block-end: 1px solid var(--k-border);
    overflow-x: auto;
  }
  .k-toolbar__group { display: flex; align-items: center; gap: var(--k-space-1); }
  .k-toolbar__sep {
    inline-size: 1px; block-size: 1.4rem; flex: none;
    background: var(--k-border);
    margin-inline: var(--k-space-1);
  }
  .k-toolbar__spring { flex: 1; }

  /* tool — an icon toggle; aria-pressed is the state */
  .k-tool {
    display: inline-grid; place-items: center;
    inline-size: 2.1rem; block-size: 2.1rem; padding: 0;
    font: inherit; color: var(--k-text-soft);
    background: none; border: 1px solid transparent;
    border-radius: var(--k-radius-s); cursor: pointer;
    transition: background var(--k-ease), color var(--k-ease);
  }
  .k-tool:hover { background: var(--k-surface-2); color: var(--k-text); }
  .k-tool[aria-pressed="true"] {
    background: var(--k-accent-soft); color: var(--k-accent-strong);
    border-color: var(--k-accent-trans-20);
  }
  .k-tool:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--k-accent-trans-20); }

  /* segmented state for button groups */
  .k-btn-group > .k-btn[aria-pressed="true"] {
    --k-btn-bg: var(--k-accent-soft);
    --k-btn-fg: var(--k-accent-strong);
    --k-btn-border: var(--k-accent-trans-20);
  }

  /* tree — layers/structure. details-based nesting; aria-selected rows */
  .k-tree { list-style: none; margin: 0; padding: 0; font-size: var(--k-text-s); }
  .k-tree li { margin: 0; }
  .k-tree ul { list-style: none; margin: 0; padding-inline-start: var(--k-space-4);
               border-inline-start: 1px solid var(--k-border); }
  .k-tree__row {
    display: flex; align-items: center; gap: var(--k-space-2);
    padding: calc(var(--k-space-1) * 1.2) var(--k-space-2);
    border-radius: var(--k-radius-s);
    color: var(--k-text-soft); cursor: pointer;
    font: inherit; background: none; border: 0;
    inline-size: 100%; text-align: start;
  }
  .k-tree__row:hover { background: var(--k-surface-2); color: var(--k-text); }
  .k-tree__row[aria-selected="true"] {
    background: var(--k-accent-soft); color: var(--k-accent-strong);
    box-shadow: inset 2px 0 0 var(--k-accent);
  }
  .k-tree details { background: none; border: 0; border-radius: 0;
                    padding: 0; margin: 0; }
  .k-tree summary { list-style: none; }
  .k-tree summary::before { content: none; }
  .k-tree details > summary .k-tree__twist {
    transition: rotate var(--k-ease); color: var(--k-text-faint);
  }
  .k-tree details[open] > summary .k-tree__twist { rotate: 90deg; }

  /* props — inspector property rows: aligned label | control */
  .k-props { display: grid; gap: var(--k-space-2); }
  .k-props__row {
    display: grid; grid-template-columns: 6.5rem minmax(0, 1fr);
    align-items: center; gap: var(--k-space-2);
  }
  .k-props__row > label {
    margin: 0; font-size: var(--k-text-xs);
    color: var(--k-text-soft); font-weight: 600;
  }
  .k-props__row input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="color"]),
  .k-props__row select {
    padding-block: var(--k-space-1); font-size: var(--k-text-s);
  }
  .k-props__group {
    font-size: var(--k-text-xs); font-weight: 650;
    text-transform: uppercase; letter-spacing: 0.06em;
    color: var(--k-text-faint);
    padding-block: var(--k-space-2) var(--k-space-1);
    border-block-start: 1px solid var(--k-border);
    margin-block-start: var(--k-space-2);
  }

  /* canvas — the workspace surface; artboard — the page on it */
  .k-canvas {
    background:
      radial-gradient(circle, var(--k-border) 1px, transparent 1px) 0 0 / 22px 22px,
      var(--k-surface-2);
    padding: var(--k-space-5);
    overflow: auto;
    display: grid; place-items: start center;
    block-size: 100%;
  }
  .k-artboard {
    background: var(--k-bg);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius);
    box-shadow: var(--k-shadow-l);
    inline-size: min(100%, 60rem);
    overflow: hidden;
  }

  /* selection — the builder's "this block is selected" outline */
  .k-selected {
    outline: 2px solid var(--k-accent);
    outline-offset: -2px;
    box-shadow: 0 0 0 4px var(--k-accent-trans-10);
  }

  /* statusbar — the thin bottom strip */
  .k-statusbar {
    display: flex; align-items: center; gap: var(--k-space-3);
    padding: var(--k-space-1) var(--k-space-3);
    background: var(--k-surface);
    border-block-start: 1px solid var(--k-border);
    font-size: var(--k-text-xs); color: var(--k-text-faint);
  }
  .k-statusbar__spring { flex: 1; }

  /* fab — a floating action button, pinned bottom-end */
  .k-fab {
    position: fixed; z-index: 40;
    inset-block-end: var(--k-space-5); inset-inline-end: var(--k-space-5);
    inline-size: 3.25rem; block-size: 3.25rem; padding: 0;
    border-radius: 50%;
    background: var(--k-fab-bg, var(--k-gradient));
    border: 2px solid var(--k-surface);
    box-shadow: var(--k-shadow-l);
    cursor: pointer;
    transition: scale var(--k-ease), box-shadow var(--k-ease);
  }
  .k-fab:hover { scale: 1.08; }
  .k-fab:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--k-accent-trans-20), var(--k-shadow-l); }

  .k-btn-group { display: inline-flex; }
  .k-btn-group > .k-btn { border-radius: 0; box-shadow: none; }
  .k-btn-group > .k-btn:first-child {
    border-start-start-radius: var(--k-radius); border-end-start-radius: var(--k-radius);
  }
  .k-btn-group > .k-btn:last-child {
    border-start-end-radius: var(--k-radius); border-end-end-radius: var(--k-radius);
  }
  .k-btn-group > .k-btn--ghost + .k-btn--ghost { border-inline-start-width: 0; }
  /* the group's shadow reset must not eat the keyboard focus ring */
  .k-btn-group > .k-btn:focus-visible {
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
    position: relative; z-index: 1;
  }

  .k-input-group { display: flex; align-items: stretch; }
  .k-input-group > input, .k-input-group > select {
    border-start-end-radius: 0; border-end-end-radius: 0;
    min-inline-size: 0;
  }
  .k-input-group > .k-btn {
    border-start-start-radius: 0; border-end-start-radius: 0; flex: none;
  }

  /* unit field — a value with a trailing unit dropdown (or a static
     affix), drawn as one control: the archetypal inspector input,
     12 [px ▾]. The whole field lights up on focus; the unit segment
     is set off by a hairline. Use a real <select> for the unit list
     (native, no JS) or a .k-unit__affix span for a fixed $ / % / px. */
  .k-unit {
    display: flex; align-items: stretch;
    inline-size: 100%;
    background: var(--k-surface);
    border: 1px solid var(--k-border-strong);
    border-radius: var(--k-radius);
    box-shadow: inset 0 1px 2px hsl(0 0% 0% / 0.03);
    transition: border-color var(--k-ease), box-shadow var(--k-ease);
  }
  .k-unit:focus-within {
    border-color: var(--k-accent);
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }
  /* the value input — borderless, fills the row */
  .k-unit > input {
    flex: 1; min-inline-size: 0;
    border: 0; background: none; box-shadow: none;
    border-radius: inherit;
  }
  .k-unit > input:focus-visible { outline: none; box-shadow: none; }
  /* the trailing unit — a de-natived compact select, or a button that
     opens a .k-menu, or a static .k-unit__affix */
  .k-unit > select,
  .k-unit > .k-unit__btn,
  .k-unit__affix {
    flex: none; align-self: stretch;
    display: inline-flex; align-items: center;
    border: 0; border-inline-start: 1px solid var(--k-border);
    background: none; box-shadow: none; border-radius: 0;
    color: var(--k-text-soft); font-size: var(--k-text-xs);
    padding-inline: var(--k-space-2);
  }
  .k-unit__affix { color: var(--k-text-faint); }
  /* affix on the leading edge instead ($ 40) */
  .k-unit > .k-unit__affix:first-child {
    border-inline-start: 0; border-inline-end: 1px solid var(--k-border);
  }
  .k-unit > select, .k-unit > .k-unit__btn { cursor: pointer; }
  .k-unit > select {
    inline-size: auto; width: auto;
    appearance: none; padding-inline-end: 1.7em;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%238a8f98' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--k-space-2) center;
    background-size: 0.55em;
  }
  .k-unit > .k-unit__btn { gap: 0.3em; font: inherit; font-size: var(--k-text-xs); }

  .k-list { list-style: none; margin: 0 0 var(--k-space-4); padding: 0;
            border: 1px solid var(--k-border); border-radius: var(--k-radius-l);
            background: var(--k-surface); overflow: hidden; }
  .k-list > li { margin: 0; padding: var(--k-space-3) var(--k-space-4); }
  .k-list > li + li { border-top: 1px solid var(--k-border); }
  .k-list > li:has(> a:only-child) { padding: 0; }
  .k-list > li > a:only-child {
    display: block; padding: var(--k-space-3) var(--k-space-4);
    color: var(--k-text); text-decoration: none;
    transition: background var(--k-ease);
  }
  .k-list > li > a:only-child:hover { background: var(--k-surface-2); }
  .k-list > li[aria-current] {
    background: var(--k-accent-soft);
    box-shadow: inset 3px 0 0 var(--k-accent);
  }
  .k-list--flush { border: 0; border-radius: 0; background: none; }
  .k-list--flush > li { padding-inline: 0; }
  .k-list--flush > li > a:only-child { padding-inline: var(--k-space-2); }

  /* dropdown — a details-based menu: works everywhere, no JS.
     Click the summary to open; click it again (or tab away) to close. */
  .k-dropdown { position: relative; display: inline-block;
                background: none; border: 0; padding: 0; margin: 0; }
  .k-dropdown > summary { display: inline-flex; margin: 0; }
  .k-dropdown > summary::before { content: none; }
  .k-dropdown[open] > summary + * {
    position: absolute; inset-inline-start: 0; top: calc(100% + 0.35rem);
    z-index: 30; min-inline-size: 12rem;
    background: var(--k-surface); border: 1px solid var(--k-border);
    border-radius: var(--k-radius); box-shadow: var(--k-shadow-l);
    padding: var(--k-space-1); margin: 0;
  }
  .k-menu { list-style: none; margin: 0; padding: 0; }
  .k-menu > li { margin: 0; }
  .k-menu a, .k-menu button {
    display: flex; align-items: center; gap: var(--k-space-2);
    inline-size: 100%; text-align: start;
    font: inherit; font-size: var(--k-text-s); color: var(--k-text);
    background: none; border: 0; cursor: pointer;
    padding: var(--k-space-2) var(--k-space-3);
    border-radius: var(--k-radius-s); text-decoration: none;
  }
  .k-menu a:hover, .k-menu button:hover { background: var(--k-surface-2); color: var(--k-text); }
  .k-menu hr { margin: var(--k-space-1) 0; }
  /* a small section header inside a menu */
  .k-menu__label {
    padding: var(--k-space-1) var(--k-space-3);
    font-size: var(--k-text-xs); font-weight: 650;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--k-text-faint);
  }
  /* trailing meta — a shortcut hint (⌘K) or a submenu chevron */
  .k-menu__hint {
    margin-inline-start: auto; padding-inline-start: var(--k-space-4);
    color: var(--k-text-faint); font-size: var(--k-text-xs);
    font-variant-numeric: tabular-nums;
  }
  /* selected/checked item — for single- or multi-select menus.
     Mark it aria-current="true" (one choice) or aria-checked="true"
     (many); pair with a leading .k-icon--check in markup. */
  .k-menu [aria-current="true"], .k-menu [aria-checked="true"] {
    color: var(--k-accent-strong); background: var(--k-accent-soft);
  }
  /* a destructive item */
  .k-menu .is-danger { color: var(--k-danger); }
  .k-menu .is-danger:hover {
    color: var(--k-danger);
    background: color-mix(in oklab, var(--k-danger) 12%, var(--k-surface));
  }
  /* disabled item — real [disabled] on a button, or aria-disabled */
  .k-menu [disabled], .k-menu [aria-disabled="true"] {
    opacity: 0.5; pointer-events: none;
  }

  /* tokens — a multi-select field: chosen values as removable chips,
     with a text entry that grows to fill the row. Chrome only: your
     JS adds/removes tokens and drives the picker (a .k-dropdown +
     .k-menu of aria-checked options pairs naturally). */
  .k-tokens {
    display: flex; flex-wrap: wrap; align-items: center;
    gap: var(--k-space-1);
    inline-size: 100%;
    padding: var(--k-space-1) var(--k-space-2);
    background: var(--k-surface);
    border: 1px solid var(--k-border-strong);
    border-radius: var(--k-radius);
    box-shadow: inset 0 1px 2px hsl(0 0% 0% / 0.03);
    cursor: text;
    transition: border-color var(--k-ease), box-shadow var(--k-ease);
  }
  .k-tokens:focus-within {
    border-color: var(--k-accent);
    box-shadow: 0 0 0 3px var(--k-accent-trans-20);
  }
  /* the borderless entry that shares the field */
  .k-tokens > input {
    flex: 1 1 6ch; min-inline-size: 6ch; inline-size: auto;
    border: 0; background: none; box-shadow: none;
    padding: var(--k-space-1);
  }
  .k-tokens > input:focus-visible { outline: none; box-shadow: none; }
  .k-token {
    display: inline-flex; align-items: center; gap: var(--k-space-1);
    font-size: var(--k-text-xs); font-weight: 600;
    background: var(--k-token-bg, var(--k-accent-soft));
    color: var(--k-token-fg, var(--k-accent-strong));
    border-radius: var(--k-radius-s);
    padding-block: 0.15em; padding-inline: 0.6em 0.2em;
  }
  .k-token__remove {
    display: inline-grid; place-items: center;
    inline-size: 1.3em; block-size: 1.3em;
    padding: 0; border: 0; border-radius: 50%;
    background: none; color: inherit; cursor: pointer;
    font-size: 1em; line-height: 1;
  }
  .k-token__remove:hover { background: color-mix(in oklab, currentColor 22%, transparent); }
  .k-token__remove:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--k-accent-trans-20); }
  .k-tokens[aria-disabled="true"] {
    background: var(--k-surface-2); cursor: not-allowed; opacity: 0.8;
  }

  /* tooltip — pure CSS via a data attribute. Pair with aria-label
     for assistive tech; for rich content use a popover instead. */
  [data-k-tip] { position: relative; }
  [data-k-tip]::after {
    content: attr(data-k-tip);
    position: absolute; inset-inline-start: 50%; bottom: calc(100% + 0.45rem);
    translate: -50% 0.25rem; z-index: 40;
    background: var(--k-text); color: var(--k-bg);
    font-size: var(--k-text-xs); font-weight: 500; line-height: 1.35;
    padding: var(--k-space-1) var(--k-space-2);
    border-radius: var(--k-radius-s);
    white-space: nowrap; pointer-events: none;
    opacity: 0; transition: opacity var(--k-ease), translate var(--k-ease);
  }
  [data-k-tip]:hover::after, [data-k-tip]:focus-visible::after {
    opacity: 1; translate: -50% 0;
  }

  .k-toast {
    position: fixed; inset-block-start: auto;
    inset-block-end: var(--k-space-4);
    inset-inline-end: var(--k-space-4); inset-inline-start: auto;
    margin: 0; max-width: min(90vw, 22rem);
    padding: var(--k-space-3) var(--k-space-4);
    font-size: var(--k-text-s);
    border-inline-start: 3px solid var(--k-accent);
  }

  .k-spinner {
    display: inline-block; inline-size: 1.1em; block-size: 1.1em;
    border: 2px solid var(--k-border-strong); border-top-color: var(--k-accent);
    border-radius: 50%; vertical-align: -0.2em;
    animation: k-spin 700ms linear infinite;
  }
  @keyframes k-spin { to { rotate: 360deg; } }

  .k-skeleton {
    display: block; block-size: 1em; border-radius: var(--k-radius-s);
    background: linear-gradient(90deg, var(--k-surface-2) 25%,
                var(--k-border) 45%, var(--k-surface-2) 65%);
    background-size: 200% 100%;
    animation: k-shimmer 1.4s ease infinite;
  }
  @keyframes k-shimmer { to { background-position: -200% 0; } }

  .k-avatar-group { display: inline-flex; }
  .k-avatar-group > .k-avatar { border: 2px solid var(--k-surface); }
  .k-avatar-group > .k-avatar + .k-avatar { margin-inline-start: -0.6rem; }

  /* accordion — a group of native details, drawn as one surface.
     Add name="…" to each details for native one-open-at-a-time. */
  .k-accordion {
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-l);
    overflow: hidden;
    margin: 0 0 var(--k-space-4);
  }
  .k-accordion > details {
    background: none; border: 0; border-radius: 0; margin: 0;
  }
  .k-accordion > details + details { border-top: 1px solid var(--k-border); }
  /* flush — dividers only, no card frame; sits inline with the page */
  .k-accordion--flush {
    background: none; border: 0; border-radius: 0; overflow: visible;
  }
  .k-accordion--flush > details { border-block-end: 1px solid var(--k-border); }
  .k-accordion--flush > details + details { border-top: 0; }

  /* tabs — the visual tab bar. Marking the active tab is
     aria-current/aria-selected; switching PANELS is either separate
     pages, a details accordion, or three lines of your own JS —
     keel ships the look, not a runtime. */
  .k-tabs {
    display: flex; gap: var(--k-space-1);
    list-style: none; margin: 0 0 var(--k-space-4); padding: 0;
    border-block-end: 1px solid var(--k-border);
    overflow-x: auto;
  }
  .k-tabs > li { margin: 0; }
  .k-tabs a, .k-tabs button {
    display: inline-block; font: inherit; font-size: var(--k-text-s);
    font-weight: 600; white-space: nowrap;
    color: var(--k-text-soft); background: none; cursor: pointer;
    border: 0; border-block-end: 2px solid transparent;
    padding: var(--k-space-2) var(--k-space-3);
    margin-block-end: -1px;
    text-decoration: none;
    transition: color var(--k-ease), border-color var(--k-ease);
  }
  .k-tabs a:hover, .k-tabs button:hover { color: var(--k-text); }
  .k-tabs [aria-current], .k-tabs [aria-selected="true"] {
    color: var(--k-text); border-block-end-color: var(--k-accent);
  }
  /* pill tabs — no underline rail; the active tab is a filled chip */
  .k-tabs--pill { border-block-end: 0; gap: var(--k-space-2); }
  .k-tabs--pill a, .k-tabs--pill button {
    border: 0; border-radius: 999px; margin-block-end: 0;
    padding: var(--k-space-2) var(--k-space-4);
  }
  .k-tabs--pill a:hover, .k-tabs--pill button:hover { background: var(--k-surface-2); }
  .k-tabs--pill [aria-current], .k-tabs--pill [aria-selected="true"] {
    background: var(--k-accent-soft); color: var(--k-accent-strong); border-color: transparent;
  }

  /* drawer — a dialog that slides from the edge (offcanvas).
     <dialog class="k-drawer">, opened with showModal(). */
  .k-drawer {
    inset-block: 0; inset-inline-end: 0; inset-inline-start: auto;
    block-size: 100%; max-block-size: none;
    inline-size: 100%; max-inline-size: min(90vw, 24rem);
    margin: 0; border: 0; border-radius: 0;
    border-inline-start: 1px solid var(--k-border);
    translate: 100% 0;
  }
  .k-drawer[open] { translate: 0 0; }
  @starting-style { .k-drawer[open] { translate: 100% 0; } }
  .k-drawer--start {
    inset-inline-start: 0; inset-inline-end: auto;
    border-inline-start: 0; border-inline-end: 1px solid var(--k-border);
    translate: -100% 0;
  }
  @starting-style { .k-drawer--start[open] { translate: -100% 0; } }

  /* gallery — a scroll-snap carousel. CSS only: swipe or scroll. */
  .k-gallery {
    display: flex; gap: var(--k-space-4);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-block-end: var(--k-space-3);
    scrollbar-width: thin;
  }
  .k-gallery > * {
    flex: 0 0 var(--k-gallery-item, min(78%, 20rem));
    scroll-snap-align: start;
  }
  /* native carousel dots where the platform has them (progressive) */
  @supports (scroll-marker-group: after) {
    .k-gallery { scroll-marker-group: after; }
    .k-gallery::scroll-marker-group {
      display: flex; gap: var(--k-space-2); justify-content: center;
      padding-block: var(--k-space-2);
    }
    .k-gallery > *::scroll-marker {
      content: ""; inline-size: 0.55rem; block-size: 0.55rem;
      border-radius: 50%; background: var(--k-border-strong);
    }
    .k-gallery > *::scroll-marker:target-current { background: var(--k-accent); }
  }

  /* icons — built in, zero requests. Each icon is an inline-SVG mask
     painted with currentColor, so it takes the text color around it
     and scales with font-size. <span class="k-icon k-icon--check"></span> */
  .k-icon {
    display: inline-block;
    inline-size: 1em; block-size: 1em;
    vertical-align: -0.125em;
    background-color: currentColor;
    /* empty-svg default: a bare .k-icon renders as nothing,
       not a solid square */
    --k-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'/%3E");
    -webkit-mask: var(--k-icon) center / contain no-repeat;
    mask: var(--k-icon) center / contain no-repeat;
  }
  /* the 64 named icons (.k-icon--check, …) live in the optional
     keel-icons.css — link it after keel.css to use them. */

  /* icon box — frame an icon: a sized container with tint, border,
     radius and color, all knobs. The "feature icon" treatment.
     Wrap a .k-icon: <span class="k-icon-box k-icon-box--circle">
       <span class="k-icon k-icon--rocket"></span></span> */
  .k-icon-box {
    display: inline-grid; place-items: center; flex: none;
    inline-size: var(--k-icon-box-size, 2.75rem);
    block-size: var(--k-icon-box-size, 2.75rem);
    border-radius: var(--k-icon-box-radius, var(--k-radius));
    background: var(--k-icon-box-bg, var(--k-accent-soft));
    color: var(--k-icon-box-fg, var(--k-accent));
    border: var(--k-icon-box-border, 0) solid var(--k-icon-box-border-color, var(--k-border-strong));
  }
  .k-icon-box .k-icon { font-size: calc(var(--k-icon-box-size, 2.75rem) * 0.48); }
  /* shape */
  .k-icon-box--circle { --k-icon-box-radius: 999px; }
  .k-icon-box--sharp { --k-icon-box-radius: 0; }
  .k-icon-box--soft { --k-icon-box-radius: var(--k-radius-l); }
  /* fill / weight */
  .k-icon-box--solid { --k-icon-box-bg: var(--k-accent); --k-icon-box-fg: var(--k-on-accent); }
  .k-icon-box--outline { --k-icon-box-bg: transparent; --k-icon-box-border: 1.5px;
                         --k-icon-box-border-color: currentColor; }
  .k-icon-box--flat { --k-icon-box-bg: transparent; --k-icon-box-fg: var(--k-text-soft); }
  .k-icon-box--ring { --k-icon-box-border: 1px; --k-icon-box-border-color: var(--k-border); }
  /* size */
  .k-icon-box--sm { --k-icon-box-size: 2.1rem; }
  .k-icon-box--lg { --k-icon-box-size: 3.5rem; }
  .k-icon-box--xl { --k-icon-box-size: 4.5rem; }
  /* color — the tint follows the status colors */
  .k-icon-box--ok { --k-icon-box-bg: color-mix(in oklab, var(--k-ok) 15%, var(--k-surface)); --k-icon-box-fg: var(--k-ok); }
  .k-icon-box--warn { --k-icon-box-bg: color-mix(in oklab, var(--k-warn) 15%, var(--k-surface)); --k-icon-box-fg: var(--k-warn); }
  .k-icon-box--danger { --k-icon-box-bg: color-mix(in oklab, var(--k-danger) 15%, var(--k-surface)); --k-icon-box-fg: var(--k-danger); }
  .k-icon-box--secondary { --k-icon-box-bg: var(--k-accent-2-soft); --k-icon-box-fg: var(--k-accent-2-strong); }
  .k-icon-box--tertiary { --k-icon-box-bg: var(--k-accent-3-soft); --k-icon-box-fg: var(--k-accent-3-strong); }
  .k-icon-box--neutral { --k-icon-box-bg: var(--k-surface-2); --k-icon-box-fg: var(--k-text); }

  /* table wrap — horizontal scroll for wide tables on small screens */
  .k-table-wrap { overflow-x: auto; margin: 0 0 var(--k-space-4); }
  .k-table-wrap > table { margin: 0; min-inline-size: max-content; inline-size: 100%; }

  /* banner — announcement strip (the top-of-page note) */
  .k-banner {
    display: flex; flex-wrap: wrap; gap: var(--k-space-1) var(--k-space-3);
    align-items: center; justify-content: center; text-align: center;
    padding: var(--k-space-2) var(--k-space-4);
    background: var(--k-banner-bg, var(--k-accent-soft));
    color: var(--k-banner-fg, var(--k-accent-strong));
    font-size: var(--k-text-s);
  }
  .k-banner a { color: inherit; }
  .k-banner--accent { --k-banner-bg: var(--k-accent); --k-banner-fg: var(--k-on-accent); }
  .k-banner--sticky { position: sticky; inset-block-start: 0; z-index: 20; }

  /* empty state — the nothing-here-yet box */
  .k-empty {
    display: grid; justify-items: center; gap: var(--k-space-2);
    text-align: center;
    padding: var(--k-space-7) var(--k-space-4);
    background: var(--k-surface);
    border: 1px dashed var(--k-border-strong);
    border-radius: var(--k-radius-l);
    color: var(--k-text-soft);
    margin: 0 0 var(--k-space-4);
  }
  .k-empty > * { margin: 0; }

  /* timeline — events down a line */
  .k-timeline { list-style: none; margin: 0 0 var(--k-space-4); padding: 0; }
  .k-timeline > li {
    position: relative; margin: 0;
    padding-inline-start: var(--k-space-5);
    padding-block-end: var(--k-space-5);
    border-inline-start: 2px solid var(--k-border);
  }
  .k-timeline > li:last-child { border-inline-start-color: transparent; padding-block-end: 0; }
  .k-timeline > li::before {
    content: "";
    position: absolute; inset-inline-start: -7px; top: 0.3em;
    inline-size: 12px; block-size: 12px; border-radius: 50%;
    background: var(--k-timeline-dot, var(--k-accent));
    border: 2px solid var(--k-bg);
  }
  /* per-event dot color: <li style="--k-timeline-dot: var(--k-ok)"> */
  .k-timeline > li.is-ok { --k-timeline-dot: var(--k-ok); }
  .k-timeline > li.is-warn { --k-timeline-dot: var(--k-warn); }
  .k-timeline > li.is-muted { --k-timeline-dot: var(--k-border-strong); }
  .k-timeline__time {
    display: block; font-family: var(--k-font-mono);
    font-size: var(--k-text-xs); color: var(--k-text-faint);
    margin-block-end: var(--k-space-1);
  }
  .k-timeline > li > :last-child { margin-block-end: 0; }

  /* swatch — a color-well button, usually opening a .k-picker */
  .k-swatch {
    inline-size: 2.5rem; block-size: 2.5rem; padding: 0; flex: none;
    background: var(--k-swatch-color, var(--k-accent));
    border: 1px solid var(--k-border-strong);
    border-radius: var(--k-radius);
    cursor: pointer;
    transition: box-shadow var(--k-ease);
  }
  .k-swatch:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--k-accent-trans-20); }

  /* picker — the panel a swatch opens (usually [popover] +
     popovertarget). The chrome is CSS; the shade math and storage
     are your JS — the design page ships a reference implementation. */
  .k-picker {
    position: fixed; inset: auto; margin: 0;
    inline-size: min(92vw, 21rem);
    padding: var(--k-space-4);
    gap: var(--k-space-3);
  }
  .k-picker:popover-open { display: grid; }
  .k-picker:not([popover]) { position: static; display: grid; }
  .k-picker__area {
    position: relative; block-size: 9.5rem;
    border-radius: var(--k-radius);
    border: 1px solid var(--k-border-strong);
    background: linear-gradient(to bottom, transparent, #000),
                linear-gradient(to right, #fff, var(--k-picker-hue, #f00));
    cursor: crosshair; touch-action: none;
  }
  .k-picker__area:focus-visible { outline: 2px solid var(--k-accent); outline-offset: 2px; }
  .k-picker__cursor {
    position: absolute; inline-size: 14px; block-size: 14px;
    border-radius: 50%; border: 2px solid #fff;
    box-shadow: 0 0 0 1.5px hsl(0 0% 0% / 0.45);
    translate: -50% -50%; pointer-events: none;
  }
  .k-picker__row {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--k-space-2);
  }
  .k-picker__label {
    font-size: var(--k-text-xs); color: var(--k-text-faint);
    text-transform: uppercase; letter-spacing: 0.06em;
  }
  /* format + value row: a compact select and a mono value input */
  .k-picker__field { display: flex; gap: var(--k-space-2); align-items: center; }
  .k-picker__field select { inline-size: auto; flex: none;
                            padding-block: var(--k-space-1); font-size: var(--k-text-s); }
  .k-picker__field input { font-family: var(--k-font-mono); font-size: var(--k-text-s);
                           padding-block: var(--k-space-1); min-inline-size: 0; }

  .k-picker__swatches { display: flex; flex-wrap: wrap; gap: var(--k-space-1); }
  .k-picker__swatches button {
    inline-size: 1.6rem; block-size: 1.6rem; padding: 0; cursor: pointer;
    border-radius: var(--k-radius-s);
    border: 1px solid hsl(0 0% 0% / 0.15);
    transition: scale var(--k-ease);
  }
  .k-picker__swatches button:hover { scale: 1.15; }

  /* panel — a card with structural regions */
  .k-panel {
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-l);
    box-shadow: var(--k-shadow-s);
    overflow: hidden;
    margin: 0 0 var(--k-space-4);
  }
  .k-panel__header, .k-panel__footer {
    padding: var(--k-space-3) var(--k-panel-pad, var(--k-space-5));
    background: color-mix(in oklab, var(--k-surface-2) 55%, var(--k-surface));
  }
  .k-panel__header { border-block-end: 1px solid var(--k-border); }
  .k-panel__footer { border-block-start: 1px solid var(--k-border); }
  .k-panel__header > *, .k-panel__footer > * { margin: 0; }
  .k-panel__body { padding: var(--k-panel-pad, var(--k-space-5)); }
  .k-panel__body > :last-child { margin-bottom: 0; }
  .k-panel--pad-sm { --k-panel-pad: var(--k-space-3); }
  .k-panel--accent .k-panel__header {
    background: var(--k-accent); color: var(--k-on-accent); border-block-end-color: transparent;
  }

  /* calendar — a month grid, display-only by design: marking dates
     is markup; PICKING dates is input[type=date] or your JS */
  .k-calendar {
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-l);
    padding: var(--k-space-4);
    max-inline-size: 22rem;
    margin: 0 0 var(--k-space-4);
  }
  .k-calendar__head {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--k-space-2); margin-block-end: var(--k-space-3);
    font-weight: 650;
  }
  .k-calendar__grid {
    display: grid; grid-template-columns: repeat(7, 1fr);
    gap: 2px; text-align: center;
  }
  .k-calendar__grid abbr {
    font-size: var(--k-text-xs); color: var(--k-text-faint);
    text-decoration: none; text-transform: uppercase;
    padding-block: var(--k-space-1);
  }
  .k-calendar__day {
    display: grid; place-items: center;
    aspect-ratio: 1;
    font: inherit; font-size: var(--k-text-s);
    background: none; border: 0; border-radius: var(--k-radius-s);
    color: var(--k-text); cursor: pointer;
    transition: background var(--k-ease);
  }
  .k-calendar__day:hover { background: var(--k-surface-2); }
  .k-calendar__day--muted { color: var(--k-text-faint); }
  .k-calendar__day[aria-current="date"] {
    box-shadow: inset 0 0 0 2px var(--k-accent);
  }
  .k-calendar__day[aria-selected="true"] {
    background: var(--k-accent); color: var(--k-on-accent);
  }

  /* one-shot entry animations — duration and delay are knobs, so
     staggering is one inline custom property */
  @media (prefers-reduced-motion: no-preference) {
    .k-anim-fade { animation: k-a-fade var(--k-anim-duration) ease var(--k-anim-delay) both; }
    .k-anim-up { animation: k-a-up var(--k-anim-duration) ease var(--k-anim-delay) both; }
    .k-anim-pop { animation: k-a-pop calc(var(--k-anim-duration) * 0.7) ease var(--k-anim-delay) both; }
    .k-anim-slide { animation: k-a-slide var(--k-anim-duration) ease var(--k-anim-delay) both; }
    @keyframes k-a-fade { from { opacity: 0; } }
    @keyframes k-a-up { from { opacity: 0; translate: 0 0.75rem; } }
    @keyframes k-a-pop { from { opacity: 0; scale: 0.94; } }
    @keyframes k-a-slide { from { opacity: 0; translate: -1rem 0; } }

    /* stagger: children animate in sequence (first six steps) */
    .k-stagger > :nth-child(1) { --k-anim-delay: 0ms; }
    .k-stagger > :nth-child(2) { --k-anim-delay: 80ms; }
    .k-stagger > :nth-child(3) { --k-anim-delay: 160ms; }
    .k-stagger > :nth-child(4) { --k-anim-delay: 240ms; }
    .k-stagger > :nth-child(5) { --k-anim-delay: 320ms; }
    .k-stagger > :nth-child(n+6) { --k-anim-delay: 400ms; }

    /* generic hover lift — any element, not just cards */
    .k-lift { transition: translate var(--k-ease), box-shadow var(--k-ease); }
    .k-lift:hover { translate: 0 -3px; box-shadow: var(--k-shadow-l); }

    /* scroll progress bar — pure CSS scroll-driven animation.
       <div class="k-progress-scroll"></div> as body's first child. */
    @supports (animation-timeline: scroll()) {
      .k-progress-scroll {
        position: fixed; inset-block-start: 0; inset-inline: 0; z-index: 50;
        block-size: 3px; background: var(--k-gradient);
        transform-origin: 0 50%; scale: 0 1;
        animation: k-a-scrollprog linear both;
        animation-timeline: scroll();
      }
      @keyframes k-a-scrollprog { to { scale: 1 1; } }
    }
  }

  /* checklist — ul for feature/pricing lists */
  .k-checklist { list-style: none; padding: 0; }
  .k-checklist > li { padding-inline-start: 1.6em; position: relative; }
  .k-checklist > li::before {
    content: "✓"; position: absolute; inset-inline-start: 0;
    color: var(--k-ok); font-weight: 700;
  }

  /* steps — numbered process list */
  .k-steps { list-style: none; padding: 0; counter-reset: k-step; }
  .k-steps > li {
    counter-increment: k-step;
    position: relative; padding-inline-start: 3rem;
    margin-block: 0 var(--k-space-4);
  }
  .k-steps > li::before {
    content: counter(k-step);
    position: absolute; inset-inline-start: 0; top: 0.1em;
    inline-size: 2rem; block-size: 2rem;
    display: grid; place-items: center;
    background: var(--k-step-bg, var(--k-accent-soft)); color: var(--k-step-fg, var(--k-accent-strong));
    font-weight: 700; font-size: var(--k-text-s);
    border-radius: 50%;
  }
  /* done/current markers — set the knob on the <li> */
  .k-steps > li.is-done { --k-step-bg: var(--k-accent); --k-step-fg: var(--k-on-accent); }
  .k-steps > li.is-current::before { box-shadow: 0 0 0 3px var(--k-accent-trans-20); }
  /* horizontal stepper — numbers in a row, labels beneath */
  .k-steps--row {
    display: flex; gap: var(--k-space-2); counter-reset: k-step;
  }
  .k-steps--row > li {
    flex: 1; text-align: center;
    padding-inline-start: 0; padding-block-start: 2.6rem; margin: 0;
  }
  .k-steps--row > li::before {
    inset-inline-start: 50%; translate: -50% 0; top: 0;
  }

  .k-divider {
    display: flex; align-items: center; gap: var(--k-space-3);
    color: var(--k-text-faint); font-size: var(--k-text-xs);
    text-transform: uppercase; letter-spacing: 0.08em;
    margin: var(--k-space-5) 0;
  }
  .k-divider::before, .k-divider::after {
    content: ""; flex: 1; border-top: 1px solid var(--k-border);
  }
  .k-divider--start::before { flex: 0 0 var(--k-space-4); }
  .k-divider--end::after { flex: 0 0 var(--k-space-4); }
  /* vertical rule — separate inline items; give it a fixed height */
  .k-divider--y {
    display: inline-block; margin: 0 var(--k-space-3);
    inline-size: 1px; block-size: 1em; align-self: center;
    background: var(--k-border);
  }
  .k-divider--y::before, .k-divider--y::after { content: none; }

  .k-close {
    inline-size: 1.9rem; block-size: 1.9rem;
    display: inline-grid; place-items: center;
    font: inherit; font-size: var(--k-text-l); line-height: 1;
    color: var(--k-text-faint); background: none;
    border: 0; border-radius: var(--k-radius-s); cursor: pointer;
    transition: background var(--k-ease), color var(--k-ease);
  }
  .k-close:hover { background: var(--k-surface-2); color: var(--k-text); }

  .k-table--hover tbody tr { transition: background var(--k-ease); }
  .k-table--hover tbody tr:hover td { background: var(--k-accent-soft); }
  .k-table--bordered th, .k-table--bordered td {
    border: 1px solid var(--k-border);
  }
  .k-table--dense th, .k-table--dense td {
    padding: var(--k-space-1) var(--k-space-2);
  }
  /* sticky header — pair with .k-table-wrap--scroll */
  .k-table--sticky thead th {
    position: sticky; inset-block-start: 0; z-index: 1;
    background: var(--k-surface);
    box-shadow: 0 1px 0 var(--k-border);
  }
  .k-table-wrap--scroll { max-block-size: 24rem; overflow-y: auto; }

  /* numeric column */
  .k-num { text-align: end; }

  /* sortable header AFFORDANCE — aria-sort styles the state;
     the sorting itself is ~10 lines of your JS */
  th[aria-sort] { padding: 0; }
  th[aria-sort] > button {
    all: unset; box-sizing: border-box;
    display: flex; align-items: center; gap: var(--k-space-1);
    inline-size: 100%; cursor: pointer;
    font: inherit; font-weight: 650; color: inherit;
    text-transform: inherit; letter-spacing: inherit;
    padding: var(--k-space-2) var(--k-space-3);
  }
  th[aria-sort] > button::after { content: "↕"; opacity: 0.35; }
  th[aria-sort="ascending"] > button::after { content: "↑"; opacity: 1; color: var(--k-accent); }
  th[aria-sort="descending"] > button::after { content: "↓"; opacity: 1; color: var(--k-accent); }
  th[aria-sort] > button:hover { color: var(--k-text); }
  th[aria-sort] > button:focus-visible { box-shadow: inset 0 0 0 2px var(--k-accent-trans-20); }

  /* selected row */
  tr[aria-selected="true"] td { background: var(--k-accent-soft); }
  tr[aria-selected="true"] td:first-child { box-shadow: inset 3px 0 0 var(--k-accent); }

  /* responsive stacking — rows become cards below sm; every td needs
     a data-label carrying its column name */
  @media (max-width: 639.98px) {
    .k-table--stack thead {
      position: absolute; inline-size: 1px; block-size: 1px;
      margin: -1px; overflow: hidden; clip-path: inset(50%);
    }
    .k-table--stack tr {
      display: block;
      background: var(--k-surface);
      border: 1px solid var(--k-border);
      border-radius: var(--k-radius);
      padding: var(--k-space-2) var(--k-space-3);
      margin-block-end: var(--k-space-3);
    }
    .k-table--stack td {
      display: flex; justify-content: space-between; gap: var(--k-space-3);
      border: 0; padding: var(--k-space-1) 0; text-align: end;
    }
    .k-table--stack td::before {
      content: attr(data-label);
      font-weight: 650; color: var(--k-text-soft); text-align: start;
    }
  }

  .k-field__error { display: none; font-size: var(--k-text-xs);
                    color: var(--k-danger); margin-top: var(--k-space-1); }
  .k-field:has(:user-invalid) .k-field__error { display: block; }
  .k-field:has(:user-invalid) > label { color: var(--k-danger); }

  /* scroll reveal — CSS-only (scroll-driven animation); progressive
     enhancement: browsers without it, and reduced-motion users,
     simply see the content. */
  @media (prefers-reduced-motion: no-preference) {
    @supports (animation-timeline: view()) {
      .k-reveal {
        animation: k-reveal-in both;
        animation-timeline: view();
        animation-range: entry 0% entry 45%;
      }
      @keyframes k-reveal-in {
        from { opacity: 0; translate: 0 1.25rem; }
        to   { opacity: 1; translate: 0 0; }
      }
    }
  }
}

/* ------------------------------------------------------------ */
@layer components {
  /* Later components — rating, combobox, kbd, code+copy, popover,
     segmented control, number stepper. Chrome only: your JS wires any
     behaviour (filtering, copying, incrementing). */

  /* rating — a row of stars. Fill the earned ones with .is-on; the
     rest stay in the off color. Colors are knobs. */
  .k-rating {
    display: inline-flex; align-items: center; gap: 0.1em;
    color: var(--k-rating-off, var(--k-border-strong)); font-size: 1.1em;
  }
  .k-rating .is-on { color: var(--k-rating-on, var(--k-warn)); }
  .k-rating__score {
    margin-inline-start: 0.45em; font-size: var(--k-text-xs);
    color: var(--k-text-faint); font-weight: 600;
  }

  /* combobox — a searchable single-select: an input above a .k-menu
     listbox you filter with JS. Toggle [hidden] on the list from your
     script (or leave it open on focus-within). */
  .k-combobox { position: relative; }
  .k-combobox > input { inline-size: 100%; }
  .k-combobox__list {
    position: absolute; inset-inline: 0; top: calc(100% + 0.35rem);
    z-index: 30; max-block-size: 15rem; overflow-y: auto;
    background: var(--k-surface); border: 1px solid var(--k-border);
    border-radius: var(--k-radius); box-shadow: var(--k-shadow-l);
    padding: var(--k-space-1); margin: 0;
  }
  .k-combobox__list[hidden] { display: none; }
  .k-combobox__list [aria-selected="true"] {
    background: var(--k-accent-soft); color: var(--k-accent-strong);
  }

  /* kbd — a keyboard key cap. Styles the bare <kbd> element. */
  kbd, .k-kbd {
    display: inline-block; font-family: var(--k-font-mono);
    font-size: 0.82em; line-height: 1;
    padding: 0.25em 0.5em; min-inline-size: 1.6em; text-align: center;
    color: var(--k-text); background: var(--k-surface);
    border: 1px solid var(--k-border-strong);
    border-block-end-width: 2px;
    border-radius: var(--k-radius-s);
  }

  /* code block with a copy button — button is chrome, JS does the copy */
  .k-code { position: relative; }
  .k-code > pre { margin: 0; }
  .k-code__copy {
    position: absolute; inset-block-start: var(--k-space-2);
    inset-inline-end: var(--k-space-2); z-index: 1;
    display: inline-flex; align-items: center; gap: 0.3em;
    font: inherit; font-size: var(--k-text-xs); cursor: pointer;
    padding: var(--k-space-1) var(--k-space-2);
    color: var(--k-text-soft); background: var(--k-surface);
    border: 1px solid var(--k-border); border-radius: var(--k-radius-s);
    opacity: 0; transition: opacity var(--k-ease), color var(--k-ease);
  }
  .k-code:hover .k-code__copy, .k-code:focus-within .k-code__copy { opacity: 1; }
  .k-code__copy:hover { color: var(--k-text); border-color: var(--k-border-strong); }

  /* editor — a code window with a title bar: traffic-light dots (in
     keel's status colors), an optional filename, and the code below.
     Chrome only; syntax highlighting and copy are your JS. Add
     --dark for a night editor regardless of page theme. */
  .k-editor {
    border: 1px solid var(--k-border); border-radius: var(--k-radius);
    overflow: hidden; margin: 0 0 var(--k-space-4);
    background: var(--k-surface);
  }
  .k-editor__bar {
    display: flex; align-items: center; gap: var(--k-space-3);
    padding: var(--k-space-2) var(--k-space-3);
    background: color-mix(in oklab, var(--k-surface-2), var(--k-border) 35%);
    border-block-end: 1px solid var(--k-border);
  }
  /* three window dots from one element, in danger/warn/ok */
  .k-editor__dots {
    flex: none; inline-size: 11px; block-size: 11px; border-radius: 50%;
    background: var(--k-danger);
    box-shadow: 17px 0 0 var(--k-warn), 34px 0 0 var(--k-ok);
    margin-inline-end: 2.6rem;
  }
  .k-editor__name {
    font-family: var(--k-font-mono); font-size: var(--k-text-xs);
    color: var(--k-text-faint);
  }
  .k-editor__bar .k-code__copy,
  .k-editor__action { margin-inline-start: auto; position: static; opacity: 1; }
  .k-editor__body { overflow-x: auto; }
  .k-editor__body > pre {
    margin: 0; border: 0; border-radius: 0;
    background: none;
  }
  /* numbered — put each line in its own element inside .k-editor__code;
     a counter draws the gutter, no per-line numbers in your markup */
  .k-editor__code { counter-reset: k-ln; margin: 0; padding: var(--k-space-3) 0; }
  .k-editor__code > * {
    counter-increment: k-ln; display: block;
    padding-inline: 3.2rem var(--k-space-4); position: relative;
    line-height: 1.7;
  }
  .k-editor__code > *::before {
    content: counter(k-ln);
    position: absolute; inset-inline-start: 0; inline-size: 2.4rem;
    text-align: end; color: var(--k-text-faint); opacity: 0.6;
    font-variant-numeric: tabular-nums; user-select: none;
  }
  /* dark editor — a night surface independent of the page theme */
  .k-editor--dark {
    --k-surface: hsl(222 20% 13%); --k-surface-2: hsl(222 18% 18%);
    --k-border: hsl(222 15% 26%); --k-text: hsl(210 25% 90%);
    --k-text-faint: hsl(215 12% 62%);
    color: var(--k-text);
  }

  /* popover — a rich floating panel via the native popover API.
     Trigger: <button popovertarget="p">; panel: <div id="p" popover
     class="k-popover">. Anchor it with CSS anchor positioning or JS;
     keel ships the panel look. */
  .k-popover {
    /* no margin override — the UA centers an un-anchored popover;
       tether it to a trigger with CSS anchor positioning or JS */
    inline-size: max-content; max-inline-size: min(92vw, 22rem);
    padding: var(--k-space-4);
    background: var(--k-surface); color: var(--k-text);
    border: 1px solid var(--k-border); border-radius: var(--k-radius-l);
    box-shadow: var(--k-shadow-l);
  }
  .k-popover > :last-child { margin-block-end: 0; }
  @media (prefers-reduced-motion: no-preference) {
    .k-popover:popover-open {
      animation: k-pop-in calc(var(--k-anim-duration) * 0.6) ease both;
    }
    @keyframes k-pop-in {
      from { opacity: 0; translate: 0 -0.35rem; }
      to   { opacity: 1; translate: 0 0; }
    }
  }

  /* segmented control — a compact pill track with a filled active
     segment. Buttons or radios inside; mark the active one
     aria-pressed / aria-checked / .is-active. */
  .k-segmented {
    display: inline-flex; gap: 2px; padding: 3px;
    background: var(--k-surface-2); border: 1px solid var(--k-border);
    border-radius: 999px;
  }
  .k-segmented > * {
    font: inherit; font-size: var(--k-text-s); font-weight: 600;
    color: var(--k-text-soft); background: none; border: 0; cursor: pointer;
    padding: var(--k-space-1) var(--k-space-4); border-radius: 999px;
    transition: background var(--k-ease), color var(--k-ease);
  }
  .k-segmented > *:hover { color: var(--k-text); }
  .k-segmented > [aria-pressed="true"],
  .k-segmented > [aria-checked="true"],
  .k-segmented > .is-active {
    background: var(--k-surface); color: var(--k-text); box-shadow: var(--k-shadow-s);
  }
  .k-segmented > :focus-visible { outline: none; box-shadow: 0 0 0 3px var(--k-accent-trans-20); }

  /* number stepper — a value with − / + buttons drawn as one control */
  .k-stepper {
    display: inline-flex; align-items: stretch;
    background: var(--k-surface);
    border: 1px solid var(--k-border-strong); border-radius: var(--k-radius);
    overflow: hidden;
  }
  .k-stepper:focus-within { border-color: var(--k-accent); box-shadow: 0 0 0 3px var(--k-accent-trans-20); }
  .k-stepper > button {
    flex: none; inline-size: 2.2rem; font: inherit; font-size: var(--k-text-l);
    line-height: 1; cursor: pointer; color: var(--k-text-soft);
    background: none; border: 0; display: grid; place-items: center;
  }
  .k-stepper > button:hover { background: var(--k-surface-2); color: var(--k-text); }
  .k-stepper > input {
    inline-size: 3.5rem; text-align: center;
    border: 0; border-inline: 1px solid var(--k-border);
    background: none; box-shadow: none; border-radius: 0;
    appearance: textfield; -moz-appearance: textfield;
  }
  .k-stepper > input::-webkit-outer-spin-button,
  .k-stepper > input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
  .k-stepper > input:focus-visible { outline: none; box-shadow: none; }
}

/* ------------------------------------------------------------ */
@layer utilities {
  /* A deliberately small utility surface. Every value is a token —
     there are no arbitrary values and no responsive prefix system.
     If you reach for these constantly, you probably want a layout
     class or a component instead. */

  /* display */
  .k-d-none { display: none; }
  .k-d-block { display: block; }
  .k-d-flex { display: flex; }
  .k-d-inline-flex { display: inline-flex; }
  .k-d-grid { display: grid; }
  /* revert-layer, not revert: roll back to the layout/components
     display value (k-cluster stays flex), not the UA default */
  .k-mobile-only { display: revert-layer; }
  .k-desktop-only { display: none; }
  @media (min-width: 820px) {
    .k-mobile-only { display: none; }
    .k-desktop-only { display: revert-layer; }
  }
  .k-visually-hidden {
    position: absolute; inline-size: 1px; block-size: 1px;
    margin: -1px; padding: 0; border: 0;
    clip-path: inset(50%); overflow: hidden; white-space: nowrap;
  }

  /* spacing — the token scale, five properties, no more */
  .k-mt-0 { margin-top: 0; }           .k-mb-0 { margin-bottom: 0; }
  .k-mt-1 { margin-top: var(--k-space-1); } .k-mb-1 { margin-bottom: var(--k-space-1); }
  .k-mt-2 { margin-top: var(--k-space-2); } .k-mb-2 { margin-bottom: var(--k-space-2); }
  .k-mt-3 { margin-top: var(--k-space-3); } .k-mb-3 { margin-bottom: var(--k-space-3); }
  .k-mt-4 { margin-top: var(--k-space-4); } .k-mb-4 { margin-bottom: var(--k-space-4); }
  .k-mt-5 { margin-top: var(--k-space-5); } .k-mb-5 { margin-bottom: var(--k-space-5); }
  .k-mt-6 { margin-top: var(--k-space-6); } .k-mb-6 { margin-bottom: var(--k-space-6); }
  .k-mt-7 { margin-top: var(--k-space-7); } .k-mb-7 { margin-bottom: var(--k-space-7); }
  .k-mt-8 { margin-top: var(--k-space-8); } .k-mb-8 { margin-bottom: var(--k-space-8); }
  .k-p-0 { padding: 0; }
  .k-p-1 { padding: var(--k-space-1); } .k-p-2 { padding: var(--k-space-2); }
  .k-p-3 { padding: var(--k-space-3); } .k-p-4 { padding: var(--k-space-4); }
  .k-p-5 { padding: var(--k-space-5); } .k-p-6 { padding: var(--k-space-6); }
  .k-px-2 { padding-inline: var(--k-space-2); } .k-py-2 { padding-block: var(--k-space-2); }
  .k-px-3 { padding-inline: var(--k-space-3); } .k-py-3 { padding-block: var(--k-space-3); }
  .k-px-4 { padding-inline: var(--k-space-4); } .k-py-4 { padding-block: var(--k-space-4); }
  .k-px-5 { padding-inline: var(--k-space-5); } .k-py-5 { padding-block: var(--k-space-5); }
  .k-gap-1 { gap: var(--k-space-1); } .k-gap-2 { gap: var(--k-space-2); }
  .k-gap-3 { gap: var(--k-space-3); } .k-gap-4 { gap: var(--k-space-4); }
  .k-gap-5 { gap: var(--k-space-5); } .k-gap-6 { gap: var(--k-space-6); }
  .k-mx-auto { margin-inline: auto; }

  /* text */
  .k-text-xs { font-size: var(--k-text-xs); }
  .k-text-s { font-size: var(--k-text-s); }
  .k-text-l { font-size: var(--k-text-l); }
  .k-text-xl { font-size: var(--k-text-xl); }
  .k-text-soft { color: var(--k-text-soft); }
  .k-text-faint { color: var(--k-text-faint); }
  .k-text-accent { color: var(--k-accent); }
  .k-text-accent-2 { color: var(--k-accent-2); }
  .k-text-accent-3 { color: var(--k-accent-3); }
  .k-text-center { text-align: center; }
  .k-text-start { text-align: start; }
  .k-text-end { text-align: end; }
  .k-bold { font-weight: 650; }
  .k-mono { font-family: var(--k-font-mono); }
  .k-uppercase { text-transform: uppercase; letter-spacing: 0.08em;
                 font-size: var(--k-text-xs); }
  .k-nowrap { white-space: nowrap; }
  .k-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .k-balance { text-wrap: balance; }

  /* flex & size */
  .k-items-center { align-items: center; }
  .k-items-start { align-items: flex-start; }
  .k-items-end { align-items: flex-end; }
  .k-items-baseline { align-items: baseline; }
  .k-justify-between { justify-content: space-between; }
  .k-justify-center { justify-content: center; }
  .k-justify-start { justify-content: flex-start; }
  .k-justify-end { justify-content: flex-end; }
  .k-flex-col { flex-direction: column; }
  .k-flex-wrap { flex-wrap: wrap; }
  .k-grow { flex-grow: 1; }
  .k-flex-none { flex: none; }
  .k-w-full { inline-size: 100%; }
  .k-maxw-narrow { max-inline-size: var(--k-width-narrow); }
  .k-maxw { max-inline-size: var(--k-width); }

  /* surface */
  .k-rounded-s { border-radius: var(--k-radius-s); }
  .k-rounded { border-radius: var(--k-radius); }
  .k-rounded-l { border-radius: var(--k-radius-l); }
  .k-rounded-full { border-radius: 999px; }
  .k-border { border: 1px solid var(--k-border); }
  .k-shadow { box-shadow: var(--k-shadow); }
  .k-shadow-l { box-shadow: var(--k-shadow-l); }
  .k-bg-surface { background: var(--k-surface); }
  .k-bg-surface-2 { background: var(--k-surface-2); }
  .k-bg-soft { background: var(--k-accent-soft); }
  .k-bg-accent-2-soft { background: var(--k-accent-2-soft); }
  .k-bg-accent-3-soft { background: var(--k-accent-3-soft); }
  .k-bg-gradient { background: var(--k-gradient); }
  .k-bg-gradient-soft { background: var(--k-gradient-soft); }
  /* mesh: soft multi-point gradient from both seeds — hero material */
  .k-bg-mesh {
    background:
      radial-gradient(at 18% 22%, var(--k-accent-trans-20), transparent 55%),
      radial-gradient(at 82% 12%, var(--k-accent-2-trans-20), transparent 50%),
      radial-gradient(at 60% 88%, var(--k-accent-trans-10), transparent 60%),
      var(--k-bg);
  }
  .k-sticky-top { position: sticky; inset-block-start: 0; z-index: 30; }
  .k-text-gradient {
    background: var(--k-gradient);
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
  }
}