/* =========================================================================
   UX by Example - global stylesheet

   Organised with @layer so the cascade is predictable and per-entry styles
   (loaded later, outside any layer) always win without specificity hacks.

   Layers:  reset · tokens · base · layout · components · utilities

   Theming is entirely custom properties. The font pair is two variables
   (--font-display / --font-body); the palette flips for dark mode via
   prefers-color-scheme. One accent (forest green) plus neutrals.
   ========================================================================= */

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

/* ---- Self-hosted fonts -------------------------------------------------- */
/* Placeholder pair. Drop the woff2 files in /fonts (see fonts/README.md).
   font-display: swap → text is never invisible while fonts load. */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/fonts/space-grotesk-latin-500.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/fonts/space-grotesk-latin-700.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-400.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-400-italic.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/fonts/ibm-plex-sans-latin-600.woff2") format("woff2");
}

/* ====================================================================== */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  * {
    margin: 0;
  }

  /* The hidden attribute must always win, even over components that set their
     own display (e.g. .btn { display: inline-flex }), which otherwise defeats
     the UA [hidden] { display: none } rule by cascade origin. */
  [hidden] {
    display: none !important;
  }

  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }

  body {
    min-block-size: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  img,
  picture,
  svg,
  canvas {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

  input,
  button,
  textarea,
  select {
    font: inherit;
    color: inherit;
  }

  button {
    cursor: pointer;
  }

  h1,
  h2,
  h3,
  h4 {
    text-wrap: balance;
  }

  p {
    text-wrap: pretty;
  }

  ul[class],
  ol[class] {
    list-style: none;
    padding: 0;
  }
}

/* ====================================================================== */
@layer tokens {
  :root {
    /* --- Typography --------------------------------------------------- */
    /* Swap the whole pair here (and the woff2 files in /fonts). */
    --font-display: "Space Grotesk", system-ui, sans-serif;
    --font-body: "IBM Plex Sans", system-ui, sans-serif;

    /* Fluid type scale, tuned to the editorial spec:
       body-md 16 · body-lg 18 · headline-sm 24 · headline-md 32 · display 48
       (display reflows to 36 on mobile). clamp(min, fluid, max). */
    --step--1: clamp(0.8125rem, 0.79rem + 0.11vw, 0.875rem); /* 13 → 14 */
    --step-0: clamp(0.95rem, 0.92rem + 0.16vw, 1rem); /* 15.2 → 16 */
    --step-1: clamp(1.0625rem, 1.02rem + 0.22vw, 1.125rem); /* 17 → 18 */
    --step-2: clamp(1.35rem, 1.22rem + 0.6vw, 1.5rem); /* 21.6 → 24 */
    --step-3: clamp(1.6rem, 1.32rem + 1.2vw, 2rem); /* 25.6 → 32 */
    --step-4: clamp(1.9rem, 1.55rem + 1.5vw, 2.5rem); /* 30 → 40 */
    --step-5: clamp(2.25rem, 1.7rem + 2.4vw, 3rem); /* 36 → 48 */

    --leading-tight: 1.1;
    --leading-snug: 1.25;
    --leading-body: 1.6;

    /* Label-caps: the editorial structural anchor (uppercase, wide tracking). */
    --label-size: 0.75rem; /* 12px */
    --tracking-caps: 0.1em;

    /* --- Spacing scale (fluid-ish, rem-based) ------------------------ */
    --space-3xs: 0.25rem;
    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-s: 1rem;
    --space-m: 1.5rem;
    --space-l: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4.5rem;
    --space-3xl: 7rem;

    /* --- Measure & radii --------------------------------------------- */
    --measure: 65ch;
    --radius-s: 4px;
    --radius-m: 12px;
    --radius-button: 16px; /* lg - buttons */
    --radius-l: 20px; /* xl - cards, hero, stage */

    /* --- Colour: LIGHT (default) -------------------------------------
       "Botanical Monochromatic": deep forest greens + desaturated sage on a
       faintly green-tinted near-white. Depth via tonal layering + hairlines,
       not shadows. Contrast checked for WCAG AA. */
    --paper: #fbfdfb; /* page background */
    --surface: #f1f6f2; /* raised surfaces, cards, the stage */
    --surface-2: #e5e9e4; /* deeper inset */
    --line: #d6e0da; /* hairline borders */
    --divider: #bec9c0; /* internal dividers (lighter than borders) */
    --ink: #15201b; /* body text - ~15:1 on paper */
    --muted: #3f4942; /* secondary text - ~8:1 on paper (AA) */

    --accent: #1f7a52; /* brand fill - buttons, dots, dot markers */
    --accent-strong: #00603d; /* primary - links, labels, active (~7:1 AA) */
    --accent-soft: #e4f1ea; /* tinted background fills, soft pills */
    --on-accent: #ffffff; /* text on a solid accent fill */

    --focus: #00603d;

    /* Status palette (assumptions). */
    --status-supported-bg: #acf2c9;
    --status-supported-fg: #035234;
    --status-challenged-bg: #ffdad9;
    --status-challenged-fg: #792e32;
    --status-revised-bg: #2d322e;
    --status-revised-fg: #eef2ec;

    /* "Paper shadow" - a whisper of green, used only on hover/elevated bits.
       Hairline borders do the real separating. */
    --shadow-s: 0 4px 20px rgba(31, 122, 82, 0.04);
    --shadow-m: 0 6px 28px rgba(31, 122, 82, 0.08);

    color-scheme: light;
  }

  /* --- Colour: DARK ------------------------------------------------- */
  @media (prefers-color-scheme: dark) {
    :root {
      --paper: #0f1512;
      --surface: #161f1a;
      --surface-2: #1d2822;
      --line: #2a382f;
      --divider: #2a382f;
      --ink: #e7efe9; /* ~14:1 on paper */
      --muted: #a0b3a8; /* ~6.8:1 on paper (AA) */

      --accent: #46c98a; /* brighter so it reads on dark */
      --accent-strong: #82d8a8; /* inverse-primary - links/labels (~10:1 AA) */
      --accent-soft: #16271e;
      --on-accent: #07140d; /* dark text on the bright accent fill */

      --focus: #82d8a8;

      --status-supported-bg: #0f3d28;
      --status-supported-fg: #82d8a8;
      --status-challenged-bg: #3a1518;
      --status-challenged-fg: #ffb3b3;
      --status-revised-bg: #dfe4de;
      --status-revised-fg: #181d19;

      --shadow-s: 0 4px 20px rgba(0, 0, 0, 0.35);
      --shadow-m: 0 6px 28px rgba(0, 0, 0, 0.45);

      color-scheme: dark;
    }
  }
}

/* ====================================================================== */
@layer base {
  body {
    font-family: var(--font-body);
    font-size: var(--step-0);
    color: var(--ink);
    background: var(--paper);
    display: flex;
    flex-direction: column;
  }

  main {
    flex: 1 0 auto;
  }

  h1,
  h2,
  h3,
  h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: var(--leading-tight);
    letter-spacing: -0.01em;
    color: var(--ink);
  }

  h1 {
    font-size: var(--step-5);
  }
  h2 {
    font-size: var(--step-3);
  }
  h3 {
    font-size: var(--step-2);
  }
  h4 {
    font-size: var(--step-1);
  }

  a {
    color: var(--accent-strong);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.18em;
    text-decoration-color: color-mix(in srgb, var(--accent-strong) 45%, transparent);
    transition: text-decoration-color 0.15s ease, color 0.15s ease;
  }
  a:hover {
    text-decoration-color: currentColor;
  }

  strong,
  b {
    font-weight: 600;
  }

  /* Visible, consistent focus everywhere. */
  :focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
    border-radius: 2px;
  }

  ::selection {
    background: var(--accent);
    color: var(--on-accent);
  }

  hr {
    border: 0;
    block-size: 1px;
    background: var(--line);
    margin-block: var(--space-l);
  }

  /* Honour reduced-motion globally; demos add their own guards too. */
  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.001ms !important;
      scroll-behavior: auto !important;
    }
  }
}

/* ====================================================================== */
@layer layout {
  .wrap {
    width: min(100% - 2 * var(--space-s), 72rem);
    margin-inline: auto;
  }

  /* Narrower column for reading-heavy content. */
  .wrap--prose {
    width: min(100% - 2 * var(--space-s), 44rem);
    margin-inline: auto;
  }

  /* Vertical rhythm helper: consistent flow spacing between children. */
  .flow > * + * {
    margin-block-start: var(--flow-space, var(--space-m));
  }
  .flow--tight > * + * {
    margin-block-start: var(--space-s);
  }

  .section {
    padding-block: var(--space-2xl);
  }
  .section--tight {
    padding-block: var(--space-xl);
  }
}

/* ====================================================================== */
@layer components {
  /* --- Skip link ---------------------------------------------------- */
  .skip-link {
    position: absolute;
    inset-inline-start: -9999px;
    inset-block-start: 0;
    z-index: 100;
  }
  .skip-link:focus {
    inset-inline-start: var(--space-s);
    inset-block-start: var(--space-s);
    background: var(--accent);
    color: var(--on-accent);
    padding: var(--space-2xs) var(--space-s);
    border-radius: var(--radius-s);
  }

  /* --- Header ------------------------------------------------------- */
  .site-header {
    border-block-end: 1px solid var(--line);
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: saturate(1.1) blur(8px);
    position: sticky;
    inset-block-start: 0;
    z-index: 20;
  }
  .site-header__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-s) var(--space-m);
    padding-block: var(--space-s);
  }

  .wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--step-1);
    letter-spacing: -0.02em;
    text-decoration: none;
    color: var(--ink);
    display: inline-flex;
    align-items: baseline;
    gap: 0.4ch;
  }
  .wordmark__ux {
    color: var(--accent);
  }
  .wordmark__rest {
    font-weight: 500;
    color: var(--muted);
  }

  .site-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-m);
    margin: 0;
  }
  .site-nav a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    padding-block: var(--space-3xs);
    border-block-end: 2px solid transparent;
  }
  .site-nav a:hover {
    color: var(--accent-strong);
  }
  .site-nav a[aria-current="page"] {
    color: var(--accent-strong);
    font-weight: 700;
    border-block-end-color: var(--accent-strong);
  }

  /* --- Footer ------------------------------------------------------- */
  .site-footer {
    margin-block-start: var(--space-3xl);
    border-block-start: 1px solid var(--line);
    background: var(--surface);
  }
  .site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-2xs) var(--space-m);
    padding-block: var(--space-l);
    color: var(--muted);
    font-size: var(--step--1);
  }
  .site-footer__copyright {
    color: var(--muted);
  }
  .site-footer__meta {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.5ch;
    align-items: baseline;
  }
  .site-footer__meta a {
    color: var(--muted);
    text-decoration-color: var(--divider);
  }
  .site-footer__meta a:hover {
    color: var(--accent-strong);
  }

  /* --- Buttons ------------------------------------------------------ */
  .btn {
    --btn-bg: transparent;
    --btn-fg: var(--ink);
    --btn-border: var(--line);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xs);
    min-block-size: 2.75rem; /* 44px touch target */
    padding-inline: var(--space-m);
    padding-block: var(--space-2xs);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--step-0);
    line-height: 1.2;
    text-decoration: none;
    color: var(--btn-fg);
    background: var(--btn-bg);
    border: 1.5px solid var(--btn-border);
    border-radius: var(--radius-button);
    transition: transform 0.12s ease, background 0.15s ease,
      border-color 0.15s ease, box-shadow 0.15s ease;
  }
  .btn:hover {
    box-shadow: var(--shadow-s);
  }
  .btn:active {
    transform: translateY(1px);
  }

  .btn--accent {
    --btn-bg: var(--accent);
    --btn-fg: var(--on-accent);
    --btn-border: var(--accent);
  }
  .btn--accent:hover {
    --btn-bg: color-mix(in srgb, var(--accent) 88%, black);
    --btn-border: var(--btn-bg);
  }
  .btn--ghost {
    --btn-bg: transparent;
    --btn-fg: var(--ink);
    --btn-border: var(--line);
  }
  .btn--ghost:hover {
    --btn-border: var(--accent);
    --btn-fg: var(--accent-strong);
  }

  /* --- The stage: where reading ends and doing begins --------------- */
  /* Every demo lives in a .stage so the boundary is unmistakable. */
  .stage {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
    padding: var(--space-l);
    margin-block: var(--space-l);
    box-shadow: var(--shadow-s);
  }
  .stage__label {
    display: inline-flex;
    align-items: center;
    gap: 0.5ch;
    font-family: var(--font-display);
    font-size: var(--step--1);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-strong);
    margin-block-end: var(--space-s);
  }
  .stage__label::before {
    content: "";
    inline-size: 0.6rem;
    block-size: 0.6rem;
    border-radius: 50%;
    background: var(--accent);
  }
  /* Reassures keyboard/JS-off readers when a demo can't run. */
  .stage__fallback {
    color: var(--muted);
    font-size: var(--step--1);
  }
  @media (min-width: 40rem) {
    .stage {
      padding: var(--space-xl);
    }
  }

  /* --- Category / tag pills ---------------------------------------- */
  .tag {
    display: inline-flex;
    align-items: center;
    font-size: var(--step--1);
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--accent-strong);
    background: var(--accent-soft);
    padding-inline: var(--space-xs);
    padding-block: 0.2rem;
    border-radius: 999px;
  }

  /* --- Prose: long-form readable content --------------------------- */
  .prose {
    max-inline-size: var(--measure);
  }
  .prose p,
  .prose ul:not([class]),
  .prose ol:not([class]) {
    font-size: var(--step-0);
  }
  .prose > * + * {
    margin-block-start: var(--space-m);
  }
  .prose h2 {
    margin-block-start: var(--space-xl);
  }
  .prose ol:not([class]) {
    padding-inline-start: 1.4em;
  }
  /* Custom square bullets in forest green - geometric to echo Space Grotesk. */
  .prose ul:not([class]) {
    list-style: none;
    padding-inline-start: 1.4em;
  }
  .prose ul:not([class]) li {
    position: relative;
  }
  .prose ul:not([class]) li::before {
    content: "";
    position: absolute;
    inset-inline-start: -1.3em;
    inset-block-start: 0.6em;
    inline-size: 6px;
    block-size: 6px;
    background: var(--accent);
  }
  .prose li + li {
    margin-block-start: var(--space-2xs);
  }
  .prose blockquote {
    margin-inline: 0;
    padding-inline-start: var(--space-m);
    color: var(--muted);
    font-style: italic;
  }

  /* --- Consent banner ---------------------------------------------- */
  .consent-banner {
    position: fixed;
    inset-inline: 0;
    inset-block-end: 0;
    z-index: 50;
    background: var(--surface);
    border-block-start: 1px solid var(--line);
    box-shadow: var(--shadow-m);
  }
  .consent-banner__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-s) var(--space-l);
    padding-block: var(--space-m);
  }
  .consent-banner__text {
    margin: 0;
    font-size: var(--step--1);
    color: var(--muted);
    max-inline-size: 52ch;
  }
  .consent-banner__actions {
    display: flex;
    gap: var(--space-2xs);
  }

  /* A <button> that reads as a text link - used for consent controls. */
  .link-button {
    appearance: none;
    border: 0;
    padding: 0;
    margin: 0;
    background: none;
    font: inherit;
    color: inherit;
    text-decoration: underline;
    cursor: pointer;
  }
}

/* ====================================================================== */
@layer utilities {
  /* Visually hidden but available to screen readers. */
  .visually-hidden {
    position: absolute !important;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .text-center {
    text-align: center;
  }
  .muted {
    color: var(--muted);
  }
  .accent {
    color: var(--accent-strong);
  }

  /* The editorial structural anchor: uppercase, wide-tracked small caps. */
  .label-caps {
    font-family: var(--font-body);
    font-size: var(--label-size);
    font-weight: 600;
    line-height: 1;
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
  }
}

/* ====================================================================== */
/* Page-level pieces (hero etc.) - small enough to keep global for now.   */
@layer components {
  .hero {
    padding-block: var(--space-2xl) var(--space-xl);
  }
  .hero__eyebrow {
    font-family: var(--font-body);
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-size: var(--label-size);
    color: var(--accent-strong);
    margin-block-end: var(--space-m);
  }
  .hero__manifesto {
    max-inline-size: 18ch;
    margin-block-end: var(--space-m);
  }
  .hero__sub {
    max-inline-size: 48ch;
    font-size: var(--step-1);
    color: var(--muted);
  }

  /* --- Browse: filters + entry grid -------------------------------- */
  .listing {
    padding-block-end: var(--space-2xl);
  }
  .listing__eyebrow {
    font-size: var(--step--1);
    color: var(--muted);
    margin-block: var(--space-l) var(--space-2xs);
  }
  .listing__title {
    margin-block-end: var(--space-l);
  }

  .filters__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2xs);
    margin-block-end: var(--space-s);
  }
  .filters__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6ch;
    padding: var(--space-2xs) var(--space-m);
    min-block-size: 2.5rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-family: var(--font-body);
    font-size: var(--label-size);
    font-weight: 600;
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
  }
  .filters__btn:hover {
    background: color-mix(in srgb, var(--accent-soft) 82%, var(--accent));
  }
  .filters__btn[aria-current="page"] {
    background: var(--accent-strong);
    color: var(--on-accent);
  }
  .filters__count {
    font-variant-numeric: tabular-nums;
    opacity: 0.7;
  }

  .listing__count {
    color: var(--muted);
    font-size: var(--step--1);
    margin-block-end: var(--space-l);
  }

  .grid {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: repeat(auto-fill, minmax(17.5rem, 1fr));
  }
  .grid__item {
    display: flex;
  }

  .card {
    display: flex;
    flex-direction: column;
    inline-size: 100%;
    padding: var(--space-l);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
    color: var(--ink);
    text-decoration: none;
    box-shadow: var(--shadow-s);
    transition: transform 0.2s ease, box-shadow 0.2s ease,
      border-color 0.2s ease;
  }
  .card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: var(--shadow-m);
  }
  .card--soon {
    box-shadow: none;
  }

  .card__head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-s);
    margin-block-end: var(--space-m);
  }
  .card__category {
    color: var(--accent-strong);
  }
  .card--soon .card__category {
    color: var(--muted);
  }
  .card__badge {
    flex: none;
    padding: 0.3em 0.6em;
    border-radius: var(--radius-s);
  }
  .card__badge--live {
    color: var(--accent-strong);
    background: var(--accent-soft);
  }
  .card__badge--soon {
    color: var(--muted);
    background: var(--surface-2);
  }
  .card__term {
    font-size: var(--step-2);
    margin-block-end: var(--space-2xs);
  }
  .card__def {
    color: var(--muted);
    font-size: var(--step-0);
    margin-block-end: var(--space-m);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .card__foot {
    margin-block-start: auto;
    padding-block-start: var(--space-s);
    border-block-start: 1px solid var(--divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .card__foot-label {
    color: var(--accent-strong);
  }
  .card--soon .card__foot-label {
    color: var(--muted);
  }
  .card__dot {
    inline-size: 8px;
    block-size: 8px;
    border-radius: 50%;
    background: var(--accent);
  }

  .grid__empty {
    color: var(--muted);
    margin-block-start: var(--space-m);
  }

  /* --- Status badges (assumptions) --------------------------------- */
  .status {
    display: inline-block;
    font-family: var(--font-body);
    font-size: var(--label-size);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.45em 0.8em;
    border-radius: 999px;
    border: 1px solid transparent;
    white-space: nowrap;
  }
  .status--untested {
    color: var(--muted);
    border-color: var(--divider);
  }
  .status--supported {
    color: var(--status-supported-fg);
    background: var(--status-supported-bg);
  }
  .status--challenged {
    color: var(--status-challenged-fg);
    background: var(--status-challenged-bg);
  }
  .status--revised {
    color: var(--status-revised-fg);
    background: var(--status-revised-bg);
  }

  /* --- Assumptions page -------------------------------------------- */
  .assumptions {
    display: flex;
    flex-direction: column;
    gap: var(--space-m);
    margin: 0;
    padding: 0;
  }
  .assumption {
    padding: var(--space-m);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-m);
  }
  .assumption__claim {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: var(--step-2);
    letter-spacing: -0.01em;
    line-height: var(--leading-snug);
    margin-block-end: var(--space-s);
  }
  .assumption__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-2xs) var(--space-s);
    margin: 0;
  }
  .assumption__note {
    color: var(--muted);
    font-size: var(--step--1);
  }
  .status-key {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-2xs) var(--space-m);
    align-items: baseline;
  }
  .status-key dd {
    margin: 0;
    color: var(--muted);
  }

  /* --- Build log: diary block, post list, post --------------------- */
  .diary {
    margin: 0;
    padding: var(--space-s) var(--space-l);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-m);
  }
  .diary__row {
    display: grid;
    grid-template-columns: 7rem 1fr;
    gap: var(--space-m);
    padding-block: var(--space-s);
  }
  .diary__row + .diary__row {
    border-block-start: 1px solid var(--divider);
  }
  .diary__row dt {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--label-size);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
    color: var(--accent-strong);
    padding-block-start: 0.2em;
  }
  .diary__row dd {
    margin: 0;
  }
  @media (max-width: 32rem) {
    .diary__row {
      grid-template-columns: 1fr;
      gap: var(--space-3xs);
    }
  }

  .post-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    margin: 0;
    padding: 0;
  }
  .post-list__date,
  .post__date {
    font-family: var(--font-display);
    font-size: var(--step--1);
    color: var(--muted);
    margin: 0 0 var(--space-3xs);
  }
  .post-list__title {
    font-size: var(--step-2);
    margin: 0 0 var(--space-2xs);
  }
  .post-list__title a {
    text-decoration: none;
  }
  .post-list__title a:hover {
    text-decoration: underline;
  }
  .post-list__summary {
    color: var(--muted);
    margin: 0;
  }
  .post__back {
    font-size: var(--step--1);
  }
}

/* ====================================================================== */
/* Entry anatomy - shared across every glossary entry.                    */
@layer components {
  .lead {
    font-size: var(--step-1);
    color: var(--muted);
    line-height: var(--leading-snug);
  }

  .entry {
    padding-block-start: var(--space-xl);
  }
  .entry__category {
    margin: 0;
    color: var(--accent-strong);
  }
  .entry__term {
    margin-block: var(--space-s) 0;
  }
  .entry__definition {
    max-inline-size: var(--measure);
  }

  /* Stage spacing inside an entry. */
  .entry__stage {
    margin-block: var(--space-xl);
  }
  .stage__coming-soon {
    color: var(--muted);
    font-size: var(--step-0);
  }

  /* Payoff - the line that converts interaction into insight. */
  .entry__payoff {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: var(--step-2);
    line-height: var(--leading-snug);
    color: var(--ink);
    max-inline-size: var(--measure);
  }

  /* Designer's note. */
  .entry__note {
    max-inline-size: var(--measure);
    margin-block-start: var(--space-l);
  }
  .entry__note > p + p {
    margin-block-start: var(--space-s);
  }

  /* Feedback footer. */
  .entry__feedback {
    margin-block-start: var(--space-2xl);
    padding-block-start: var(--space-l);
    border-block-start: 1px solid var(--line);
    --flow-space: var(--space-l);
  }
  .feedback__q {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: var(--step-1);
    margin-block-end: var(--space-s);
  }
  .feedback__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2xs);
  }
  .feedback [data-feedback-choice].is-chosen {
    --btn-bg: var(--accent-soft);
    --btn-border: var(--accent);
    --btn-fg: var(--accent-strong);
  }
  .feedback [data-feedback-choice]:disabled {
    cursor: default;
    opacity: 0.85;
  }
  .feedback__thanks {
    margin-block-start: var(--space-s);
    color: var(--muted);
    font-size: var(--step-0);
  }

  .related__title {
    font-size: var(--step--1);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-block-end: var(--space-2xs);
  }
  .related__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2xs) var(--space-s);
  }
  .related__list a {
    font-weight: 500;
  }

  .entry__suggest {
    font-size: var(--step--1);
    color: var(--muted);
  }

  /* Further reading - affiliate-linked books/tools per entry. Deliberately
     quiet: a list, not a storefront. Matches the .related block's tone. */
  .further-reading__title {
    font-size: var(--step--1);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-block-end: var(--space-2xs);
  }
  .further-reading__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    max-inline-size: var(--measure);
  }
  .further-reading__name {
    font-weight: 500;
  }
  .further-reading__author {
    color: var(--muted);
  }
  .further-reading__author::before {
    content: "· ";
  }
  .further-reading__note {
    display: block;
    font-size: var(--step--1);
    color: var(--muted);
  }
  .further-reading__disclosure {
    margin-block-start: var(--space-xs);
    font-size: var(--step--2);
    color: var(--muted);
  }
}

/* --- Support / "Buy me a coffee" CTA --------------------------------------
   One coffee button, four placements. Reuses the .btn system; .btn--coffee
   only nudges the emoji's optical alignment. */
@layer components {
  .btn--coffee span[aria-hidden] {
    /* Lift the cup so it sits on the text baseline, not below it. */
    transform: translateY(-0.05em);
    font-size: 1.1em;
    line-height: 1;
  }

  /* Nav: a compact button that doesn't shout next to the text links. */
  .site-nav__support {
    min-block-size: 2.25rem;
    padding-inline: var(--space-s);
    font-size: var(--step--1);
  }

  /* Footer: a plain text link matching the surrounding meta links. */
  .site-footer__support {
    color: var(--muted);
    text-decoration-color: var(--divider);
    white-space: nowrap;
  }
  .site-footer__support:hover {
    color: var(--accent-strong);
  }

  /* End-of-entry: a soft, bordered prompt that reads as an aside, not an ad. */
  .support-prompt {
    margin-block-start: var(--space-xl);
    padding: var(--space-m);
    background: var(--accent-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
    text-align: center;
  }
  .support-prompt__text {
    max-inline-size: 48ch;
    margin-inline: auto;
    color: var(--ink);
    font-size: var(--step-0);
  }

  /* Support page: give the primary button room to breathe. */
  .support-page__cta {
    margin-block: var(--space-l);
  }
}

/* ====================================================================== */
/* Breadcrumbs + contact form                                             */
@layer components {
  .breadcrumbs {
    margin-block-end: var(--space-l);
  }
  .breadcrumbs__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    margin: 0;
    padding: 0;
    list-style: none;
    font-family: var(--font-body);
    font-size: var(--label-size);
    font-weight: 600;
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
  }
  .breadcrumbs__item {
    display: inline-flex;
    align-items: center;
  }
  .breadcrumbs__item + .breadcrumbs__item::before {
    content: "/";
    margin-inline: 0.6ch;
    color: var(--divider);
    font-weight: 400;
  }
  .breadcrumbs a {
    color: var(--muted);
    text-decoration: none;
  }
  .breadcrumbs a:hover {
    color: var(--accent-strong);
  }
  .breadcrumbs [aria-current="page"] {
    color: var(--ink);
  }

  /* Contact form */
  .contact-form {
    max-inline-size: 40rem;
  }
  .field {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
  }
  .field label {
    font-weight: 600;
    font-size: var(--step-0);
  }
  .field__hint {
    color: var(--muted);
    font-weight: 400;
  }
  .field input,
  .field textarea {
    inline-size: 100%;
    padding: var(--space-2xs) var(--space-s);
    min-block-size: 2.75rem;
    background: var(--surface);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: var(--radius-m);
    font-family: var(--font-body);
    font-size: var(--step-0);
  }
  .field textarea {
    min-block-size: 8rem;
    resize: vertical;
    line-height: var(--leading-body);
  }
  .field input:focus-visible,
  .field textarea:focus-visible {
    outline: none;
    border-color: var(--accent-strong);
    box-shadow: 0 0 0 2px var(--accent-strong);
  }
  .field__note {
    font-size: var(--step--1);
  }
  /* Honeypot: pulled out of layout and assistive tech, left for bots. */
  .field-honeypot {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }
  .contact-status {
    padding: var(--space-s) var(--space-m);
    border-radius: var(--radius-m);
    border: 1px solid var(--line);
    font-weight: 500;
  }
  .contact-status.is-ok {
    color: var(--status-supported-fg);
    background: var(--status-supported-bg);
    border-color: transparent;
  }
  .contact-status.is-err {
    color: var(--status-challenged-fg);
    background: var(--status-challenged-bg);
    border-color: transparent;
  }

  /* Charity fundraising callout (homepage). */
  .bhf {
    margin-block: var(--space-xl) var(--space-2xl);
  }
  .bhf__inner {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-s);
    padding: var(--space-l);
    background: var(--accent-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
  }
  .bhf__eyebrow {
    margin: 0;
    color: var(--accent-strong);
  }
  .bhf__text {
    margin: 0;
    max-inline-size: 60ch;
    font-size: var(--step-1);
    color: var(--ink);
  }
  .bhf__actions {
    margin: 0;
  }
}