/* ============================================================
   DATUM — davidjwells.com
   A datum is the fixed reference every measurement is taken
   from. This site is built like a dimensioned drawing so that
   every claim on it is traceable back to evidence.
   ============================================================ */

/* ------------------------------------------------------------
   1. TOKENS
   ------------------------------------------------------------ */

:root {
  color-scheme: light dark;

  /* Typefaces */
  --font-display: "Archivo", "Helvetica Neue", Arial, "Segoe UI", system-ui, sans-serif;
  --font-text: "Newsreader", "Iowan Old Style", Charter, Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Type scale, fluid 360px -> 1440px */
  --step--2: clamp(0.688rem, 0.667rem + 0.09vw, 0.75rem);
  --step--1: clamp(0.813rem, 0.781rem + 0.14vw, 0.906rem);
  --step-0: clamp(1rem, 0.958rem + 0.19vw, 1.125rem);
  --step-1: clamp(1.125rem, 1.063rem + 0.28vw, 1.313rem);
  --step-2: clamp(1.313rem, 1.208rem + 0.46vw, 1.625rem);
  --step-3: clamp(1.563rem, 1.396rem + 0.74vw, 2.063rem);
  --step-4: clamp(1.875rem, 1.583rem + 1.3vw, 2.75rem);
  --step-5: clamp(2.25rem, 1.75rem + 2.22vw, 3.75rem);
  --step-6: clamp(2.75rem, 1.917rem + 3.7vw, 5.25rem);
  --step-7: clamp(3.25rem, 1.917rem + 5.93vw, 7.25rem);

  /* Leading and tracking */
  --lh-display: 0.94;
  --lh-tight: 1.06;
  --lh-heading: 1.14;
  --lh-snug: 1.35;
  --lh-body: 1.62;
  --lh-loose: 1.75;

  --tr-display: -0.022em;
  --tr-heading: -0.014em;
  --tr-label: 0.1em;

  /* Spacing, 4px base */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;
  --sp-10: 8rem;

  --section-y: clamp(4rem, 7vw, 8.5rem);
  --block-y: clamp(2rem, 3.5vw, 3.5rem);

  /* Layout */
  --page: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --rail: 6rem;
  --measure: 68ch;
  --measure-tight: 54ch;
  --unit: 8px;

  /* Radii — engineered, near zero */
  --r-0: 0px;
  --r-1: 2px;
  --r-2: 3px;
  --r-full: 999px;

  /* Borders */
  --bw-hair: 1px;
  --bw-rule: 2px;
  --tick-len: 10px;
  --tick-gap: 8px;

  /* Motion */
  --dur-1: 120ms;
  --dur-2: 180ms;
  --dur-3: 280ms;
  --dur-4: 460ms;
  --dur-5: 700ms;

  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ease-precise: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ---- Light theme (default) ---- */
:root {
  --bg: #f6f8fa;
  --bg-sunk: #ebeff4;
  --surface: #ffffff;
  --surface-2: #f0f3f7;
  --bg-invert: #0d1b2e;

  --ink: #0d1b2e;
  --ink-2: #38465b;
  --ink-3: #5a6979;
  --ink-4: #8a97a6;
  --ink-invert: #f6f8fa;

  --line: #dce3eb;
  --line-2: #c2ccd8;
  --line-strong: #7e8d9f;

  --signal: #1a5fb4;
  --signal-ink: #ffffff;
  --signal-wash: #e3edf9;

  --ok: #1e7a4d;
  --warn: #8a6100;
  --risk: #b3261e;

  --focus: #0d1b2e;
  --focus-halo: #f6f8fa;

  --grid-line: rgb(13 27 46 / 5.5%);
  --grid-line-2: rgb(13 27 46 / 10%);

  --shadow-plate: 3px 3px 0 0 var(--line-2);
  --shadow-signal: 3px 3px 0 0 var(--signal);

  /* Amber glass on the replay schematic. A material colour, the same
     in both themes. */
  --amber-glass: #c8860d;
}

/* ---- Dark theme, by system preference ---- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1420;
    --bg-sunk: #070d16;
    --surface: #121c2a;
    --surface-2: #1a2635;
    --bg-invert: #070d16;

    --ink: #e8edf3;
    --ink-2: #b4becc;
    --ink-3: #8593a4;
    --ink-4: #5a6675;
    --ink-invert: #e8edf3;

    --line: #223044;
    --line-2: #314056;
    --line-strong: #4a5a70;

    --signal: #6ba6f0;
    --signal-ink: #06101c;
    --signal-wash: #132539;

    --ok: #5cbe8a;
    --warn: #d6a420;
    --risk: #f2837b;

    --focus: #e8edf3;
    --focus-halo: #0b1420;

    --grid-line: rgb(232 237 243 / 5.5%);
    --grid-line-2: rgb(232 237 243 / 11%);

    --shadow-plate: 3px 3px 0 0 var(--line-2);
    --shadow-signal: 3px 3px 0 0 var(--signal);
  }
}

/* ---- Dark theme, by explicit toggle ---- */
:root[data-theme="dark"] {
  --bg: #0b1420;
  --bg-sunk: #070d16;
  --surface: #121c2a;
  --surface-2: #1a2635;
  --bg-invert: #070d16;

  --ink: #e8edf3;
  --ink-2: #b4becc;
  --ink-3: #8593a4;
  --ink-4: #5a6675;
  --ink-invert: #e8edf3;

  --line: #223044;
  --line-2: #314056;
  --line-strong: #4a5a70;

  --signal: #6ba6f0;
  --signal-ink: #06101c;
  --signal-wash: #132539;

  --ok: #5cbe8a;
  --warn: #d6a420;
  --risk: #f2837b;

  --focus: #e8edf3;
  --focus-halo: #0b1420;

  --grid-line: rgb(232 237 243 / 5.5%);
  --grid-line-2: rgb(232 237 243 / 11%);

  --shadow-plate: 3px 3px 0 0 var(--line-2);
  --shadow-signal: 3px 3px 0 0 var(--signal);
}

/* ------------------------------------------------------------
   2. BASE
   ------------------------------------------------------------ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h, 60px) + var(--sp-4));
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font-display);
  font-size: var(--step-0);
  line-height: var(--lh-snug);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-variation-settings: "wdth" 88;
  line-height: var(--lh-heading);
  letter-spacing: var(--tr-heading);
  text-wrap: balance;
}

h1 {
  font-size: var(--step-6);
  line-height: var(--lh-display);
  letter-spacing: var(--tr-display);
}

h2 {
  font-size: var(--step-4);
}

h3 {
  font-size: var(--step-3);
}

h4 {
  font-size: var(--step-2);
  line-height: var(--lh-tight);
  font-variation-settings: "wdth" 94;
}

p {
  margin: 0;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
}

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 1px var(--focus-halo);
  border-radius: var(--r-1);
}

.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: var(--sp-4);
  z-index: 100;
  padding: var(--sp-3) var(--sp-5);
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--r-1);
  transform: translateY(-200%);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ------------------------------------------------------------
   3. LAYOUT
   ------------------------------------------------------------ */

.wrap {
  width: min(var(--page), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.page-grid {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  column-gap: var(--sp-6);
  width: min(var(--page), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.page-grid > .rail {
  border-right: var(--bw-hair) solid var(--line);
}

.rail__idx {
  position: sticky;
  top: var(--sp-6);
  display: block;
  padding-top: var(--sp-1);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 1023px) {
  .page-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-grid > .rail {
    display: none;
  }
}

.section {
  padding-block: var(--section-y);
}

.prose {
  max-width: var(--measure);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-1);
  line-height: var(--lh-body);
  color: var(--ink-2);
  text-wrap: pretty;
}

.prose p + p,
.prose ul,
.prose ol {
  margin-top: var(--sp-5);
}

.prose h2,
.prose h3 {
  margin-top: var(--sp-8);
  margin-bottom: var(--sp-4);
}

.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.prose a:hover {
  color: var(--signal);
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.lede {
  max-width: var(--measure-tight);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-2);
  line-height: var(--lh-snug);
  color: var(--ink-2);
  text-wrap: pretty;
}

/* ------------------------------------------------------------
   4. SIGNATURE ELEMENTS
   ------------------------------------------------------------ */

/* 4.1 Datum rule — the only divider on the site */
.rule {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  margin-block: var(--block-y);
}

.rule__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

.rule__line {
  flex: 1 1 auto;
  height: 9px;
  border-bottom: var(--bw-hair) solid var(--line-2);
  border-inline: var(--bw-hair) solid var(--line-2);
}

.rule--signal .rule__line {
  border-color: var(--signal);
}

.rule--signal .rule__label {
  color: var(--signal);
}

/* A long label must wrap rather than push the rule off-canvas. */
@media (max-width: 640px) {
  .rule {
    flex-wrap: wrap;
    row-gap: var(--sp-2);
  }

  .rule__label {
    /* flex: none sizes to max-content, so the label must be allowed to
       take a full row before white-space: normal can do anything. */
    flex: 1 1 100%;
    min-width: 0;
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .rule__line {
    flex-basis: 100%;
  }
}

/* 4.2 Registration-mark plate — the anti-card */
.plate {
  position: relative;
  background-color: var(--surface);
  padding: var(--sp-5);
  border-radius: var(--r-1);
  transition:
    box-shadow var(--dur-2) var(--ease-standard),
    background-color var(--dur-1) var(--ease-standard);
  background-image:
    linear-gradient(var(--line-2), var(--line-2)), linear-gradient(var(--line-2), var(--line-2)),
    linear-gradient(var(--line-2), var(--line-2)), linear-gradient(var(--line-2), var(--line-2)),
    linear-gradient(var(--line-2), var(--line-2)), linear-gradient(var(--line-2), var(--line-2)),
    linear-gradient(var(--line-2), var(--line-2)), linear-gradient(var(--line-2), var(--line-2));
  background-size:
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len);
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
  background-repeat: no-repeat;
}

.plate:hover,
.plate:focus-within {
  box-shadow:
    0 0 0 1px var(--line-2),
    var(--shadow-plate);
}

/* 4.3 Dimension callout — the headline-metric device */
.dim {
  display: inline-flex;
  flex-direction: column;
  gap: var(--sp-2);
  align-items: flex-start;
}

.dim__value {
  font-family: var(--font-display);
  font-variation-settings: "wdth" 82;
  font-weight: 600;
  font-size: var(--step-6);
  line-height: var(--lh-display);
  letter-spacing: var(--tr-display);
  color: var(--ink);
  font-variant-numeric: tabular-nums lining-nums;
}

.dim__bracket {
  align-self: stretch;
  height: 7px;
  border-top: var(--bw-hair) solid var(--signal);
  border-inline: var(--bw-hair) solid var(--signal);
}

.dim__unit {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: var(--lh-snug);
}

/* 4.5 Data-tick strip */
.tick-rule {
  height: 5px;
  background-image: repeating-linear-gradient(
    to right,
    var(--line-2) 0 1px,
    transparent 1px var(--tick-gap)
  );
  border-top: var(--bw-hair) solid var(--line-2);
}

.tick-rule--signal {
  background-image: repeating-linear-gradient(
    to right,
    var(--signal) 0 1px,
    transparent 1px var(--tick-gap)
  );
  border-top-color: var(--signal);
}

/* Mono label, used for all annotation */
.mono {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ------------------------------------------------------------
   5. CONTROLS
   ------------------------------------------------------------ */

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border: var(--bw-hair) solid var(--ink);
  border-radius: var(--r-1);
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 600;
  font-variation-settings: "wdth" 94;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--dur-1) var(--ease-standard),
    color var(--dur-1) var(--ease-standard),
    border-color var(--dur-1) var(--ease-standard);
}

.button.primary {
  background: var(--ink);
  color: var(--bg);
}

.button.primary:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
}

.button.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

.button.secondary:hover {
  border-color: var(--signal);
  color: var(--signal);
}

/* Status dot — the only place --r-full is allowed */
.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: var(--r-full);
  background: var(--signal);
  vertical-align: 0.08em;
}

/* ------------------------------------------------------------
   6. SITE CHROME
   ------------------------------------------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: var(--bw-hair) solid var(--line);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header {
    background: var(--bg);
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  width: min(var(--page), 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding-block: var(--sp-4);
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-variation-settings: "wdth" 88;
  font-size: var(--step-1);
  letter-spacing: var(--tr-heading);
  color: var(--ink);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
  padding-block: var(--sp-1);
  border-bottom: var(--bw-rule) solid transparent;
  transition:
    color var(--dur-1) var(--ease-standard),
    border-color var(--dur-1) var(--ease-standard);
}

.site-nav a:hover {
  color: var(--ink);
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--signal);
}

.theme-toggle {
  min-height: 40px;
  padding: var(--sp-2) var(--sp-4);
  background: transparent;
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  cursor: pointer;
  transition:
    color var(--dur-1) var(--ease-standard),
    border-color var(--dur-1) var(--ease-standard);
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

@media (max-width: 640px) {
  .site-header__inner {
    flex-wrap: wrap;
    gap: var(--sp-2) var(--sp-4);
  }

  .site-nav {
    flex-wrap: wrap;
    gap: var(--sp-1) var(--sp-3);
  }

  .site-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding-block: var(--sp-2);
    font-size: var(--step--2);
    letter-spacing: 0.06em;
  }

  /* A wrapped nav pinned to the top would hold a third of a phone
     screen. On phones the header scrolls with the page. */
  .site-header {
    position: static;
  }
}

/* Inverted contact footer band */
.contact-band {
  background: var(--bg-invert);
  color: var(--ink-invert);
  padding-block: var(--section-y);
  margin-top: var(--section-y);
  border-top: var(--bw-hair) solid var(--line);
}

.contact-band h2 {
  color: var(--ink-invert);
  max-width: 14ch;
  font-size: var(--step-5);
  font-variation-settings: "wdth" 84;
  margin-top: var(--sp-3);
}

.contact-band__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--sp-8);
  align-items: end;
}

.contact-band__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  align-items: flex-start;
}

.contact-band__email {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 600;
  font-variation-settings: "wdth" 88;
  color: var(--ink-invert);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  overflow-wrap: anywhere;
  transition: text-decoration-color var(--dur-1) var(--ease-standard);
}

@media (max-width: 480px) {
  .contact-band__email {
    font-size: var(--step-1);
  }
}

.contact-band__email:hover {
  text-decoration-color: var(--ink-invert);
}

.contact-band__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-5);
}

.contact-band__meta .mono {
  color: color-mix(in srgb, var(--ink-invert) 66%, transparent);
}

.contact-band p.mono {
  color: color-mix(in srgb, var(--ink-invert) 66%, transparent);
}

.contact-band__link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding-block: var(--sp-2);
}

.contact-band__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  margin-top: var(--sp-8);
  padding-top: var(--sp-5);
  border-top: var(--bw-hair) solid color-mix(in srgb, var(--ink-invert) 22%, transparent);
}

.contact-band__foot .mono {
  color: color-mix(in srgb, var(--ink-invert) 60%, transparent);
}

.contact-band .theme-toggle {
  color: color-mix(in srgb, var(--ink-invert) 66%, transparent);
  border-color: color-mix(in srgb, var(--ink-invert) 28%, transparent);
}

.contact-band .theme-toggle:hover {
  color: var(--ink-invert);
  border-color: var(--ink-invert);
}

@media (max-width: 800px) {
  .contact-band__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    align-items: start;
  }
}

/* ------------------------------------------------------------
   7. REDUCED MOTION
   Every animated element is authored so its default CSS state
   is the final, visible state.
   ------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------
   8. PLACEHOLDERS
   Unverified content renders visibly. Nothing ships silently.
   ------------------------------------------------------------ */

.todo {
  display: inline-block;
  padding: 0.1em 0.5em;
  border: var(--bw-hair) dashed var(--line-strong);
  border-radius: var(--r-1);
  background: var(--surface-2);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 0.82em;
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0;
  text-transform: none;
}

/* A whole paragraph awaiting content reads as a margin note. */
p.todo {
  display: block;
  max-width: var(--measure-tight);
  padding: var(--sp-4) var(--sp-5);
  font-size: var(--step--1);
  line-height: var(--lh-loose);
}

p.todo::before {
  content: "Editor's note";
  display: block;
  margin-bottom: var(--sp-2);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ------------------------------------------------------------
   9. HERO
   ------------------------------------------------------------ */

.hero {
  padding-block: clamp(3rem, 6vw, 6rem) var(--section-y);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: var(--sp-8);
  align-items: start;
}

.hero h1 {
  font-size: var(--step-6);
  font-variation-settings: "wdth" 84;
  max-width: 18ch;
}

.hero__lede {
  margin-top: var(--sp-6);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-top: var(--sp-7);
}

/* Spec block — the proof strip, restructured so the eye can rank it */
.spec {
  margin: 0;
  border-top: var(--bw-hair) solid var(--line-2);
}

.spec__row {
  display: grid;
  grid-template-columns: 10ch minmax(0, 1fr);
  gap: var(--sp-4);
  padding-block: var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line);
}

.spec dt {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: var(--lh-loose);
}

.spec dd {
  margin: 0;
  font-size: var(--step-0);
  color: var(--ink);
  line-height: var(--lh-snug);
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-7);
  }

  .hero h1 {
    max-width: none;
  }
}

/* ------------------------------------------------------------
   10. WORK REGISTER
   A register of rows reads as a body of work.
   Four rounded cards read as "everything I have ever done".
   ------------------------------------------------------------ */

.register {
  border-top: var(--bw-hair) solid var(--line-2);
}

.register__row {
  position: relative;
  display: grid;
  grid-template-columns: 7ch minmax(0, 1fr) 12ch 15ch;
  gap: var(--sp-5);
  align-items: baseline;
  padding-block: var(--sp-5);
  border-bottom: var(--bw-hair) solid var(--line);
  text-decoration: none;
  color: inherit;
  isolation: isolate;
  transition:
    background-color var(--dur-2) var(--ease-standard),
    box-shadow var(--dur-2) var(--ease-standard);
}

/* The hover surface bleeds a little past the text on both sides, so the
   row lights up as a strip while the rules stay aligned to the column. */
a.register__row::before {
  content: "";
  position: absolute;
  inset: 0 calc(-1 * var(--sp-4));
  z-index: -1;
  border-radius: var(--r-1);
  transition:
    background-color var(--dur-2) var(--ease-standard),
    box-shadow var(--dur-2) var(--ease-standard);
}

a.register__row:hover::before,
a.register__row:focus-visible::before {
  background-color: var(--surface);
  box-shadow: inset var(--bw-rule) 0 0 var(--signal);
}

a.register__row:focus-visible {
  outline-offset: 4px;
}

.register__year {
  text-wrap: balance;
}

.register__id,
.register__year,
.register__org {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.register__org {
  text-transform: uppercase;
  letter-spacing: var(--tr-label);
  font-size: var(--step--2);
}

.register__title {
  display: block;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 600;
  font-variation-settings: "wdth" 92;
  line-height: var(--lh-tight);
  letter-spacing: var(--tr-heading);
  color: var(--ink);
}

.register__outcome {
  display: block;
  margin-top: var(--sp-2);
  max-width: 60ch;
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-snug);
  color: var(--ink-2);
}

.register__arrow {
  display: inline-block;
  color: var(--ink-3);
  transition: transform var(--dur-2) var(--ease-standard);
}

.register__row:hover .register__arrow,
.register__row:focus-visible .register__arrow {
  transform: translateX(4px);
  color: var(--signal);
}

.register__row--live .register__id {
  color: var(--signal);
}

@media (max-width: 800px) {
  .register__row {
    grid-template-columns: 7ch minmax(0, 1fr);
    gap: var(--sp-2) var(--sp-4);
  }

  a.register__row::before {
    inset: 0 calc(-1 * var(--sp-3));
  }

  .register__year:empty,
  .register__org:empty {
    display: none;
  }

  .register__year {
    margin-top: var(--sp-1);
  }

  .register__year,
  .register__org {
    grid-column: 2;
  }

  .register__arrow {
    display: none;
  }
}

/* Section header */
.section-head {
  max-width: var(--measure);
  margin-bottom: var(--block-y);
}

.section-head h2,
.section-head h1 {
  margin-bottom: var(--sp-4);
}

.section-head h1 {
  font-size: var(--step-5);
}

/* ------------------------------------------------------------
   11. PRINCIPLES
   ------------------------------------------------------------ */

.principles {
  border-top: var(--bw-hair) solid var(--line-2);
}

.principle {
  display: grid;
  grid-template-columns: 7ch minmax(0, 1fr);
  gap: var(--sp-5);
  padding-block: var(--sp-6);
  border-bottom: var(--bw-hair) solid var(--line);
}

.principle__n {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.principle h3 {
  max-width: 30ch;
  font-size: var(--step-2);
  font-variation-settings: "wdth" 92;
}

.principle p {
  max-width: var(--measure);
  margin-top: var(--sp-3);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

@media (max-width: 640px) {
  .principle {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-3);
  }
}

/* ------------------------------------------------------------
   12. CASE STUDY
   ------------------------------------------------------------ */

.case-masthead {
  padding-block: clamp(2.5rem, 5vw, 4.5rem) 0;
}

.case-masthead h1 {
  font-size: var(--step-5);
  max-width: 20ch;
  margin-top: var(--sp-4);
}

.case-masthead .lede {
  margin-top: var(--sp-5);
}

/* Result band — the point of the page, at the top of the page */
.result-band {
  padding: var(--sp-7) var(--sp-6);
  margin-block: var(--block-y);
  background: var(--bg-sunk);
  border-radius: var(--r-1);
}

.result-band__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
  gap: var(--sp-7);
  margin-top: var(--sp-6);
}

.result-band .dim__value {
  font-size: var(--step-5);
}

/* Facts table */
.facts {
  margin: 0;
  border-top: var(--bw-hair) solid var(--line-2);
}

.facts__row {
  display: grid;
  grid-template-columns: 14ch minmax(0, 1fr);
  gap: var(--sp-5);
  padding-block: var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line);
}

.facts__row:nth-child(odd) {
  background: var(--bg-sunk);
}

.facts dt {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: var(--lh-loose);
  padding-left: var(--sp-3);
}

.facts dd {
  margin: 0;
  font-size: var(--step-0);
  color: var(--ink);
  padding-right: var(--sp-3);
}

@media (max-width: 640px) {
  .facts__row {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-1);
  }

  .facts dd {
    padding-left: var(--sp-3);
  }
}

/* Evidence figure */
.figure {
  margin: var(--sp-8) 0;
  max-width: var(--measure);
}

.figure__frame {
  padding: var(--sp-6);
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
}

.figure figcaption {
  margin-top: var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Pull quote */
.pullquote {
  max-width: var(--measure-tight);
  margin: var(--sp-8) 0;
  padding-left: var(--sp-5);
  border-left: var(--bw-rule) solid var(--signal);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-style: italic;
  font-size: var(--step-3);
  line-height: var(--lh-snug);
  color: var(--ink);
}

/* Method footnote — where AI actually did work */
.method {
  max-width: var(--measure);
  margin-top: var(--sp-8);
  padding-top: var(--sp-5);
  border-top: var(--bw-hair) solid var(--line-2);
  font-size: var(--step--1);
  line-height: var(--lh-loose);
  color: var(--ink-3);
}

.method h2 {
  font-size: var(--step-1);
  margin-bottom: var(--sp-3);
}

/* Prev / next */
.pager {
  margin-top: var(--section-y);
  border-top: var(--bw-hair) solid var(--line-2);
}

/* ------------------------------------------------------------
   13. THE CUTOVER — simulation
   ------------------------------------------------------------ */

.sim__intro h1 {
  font-size: var(--step-6);
  max-width: 14ch;
}

.sim__disclaimer {
  margin-top: var(--sp-6);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--ink-3);
}

/* HUD */
.hud {
  display: none;
  position: sticky;
  top: var(--header-h, 60px);
  z-index: 10;
  padding-block: var(--sp-3);
  background: var(--bg);
  border-bottom: var(--bw-hair) solid var(--line-2);
}

@media (max-width: 720px) {
  .hud__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}

/* Node */
.sim__node {
  padding-block: var(--section-y) 0;
}

.node__msg {
  max-width: var(--measure);
  margin-top: var(--sp-5);
  padding: var(--sp-6);
  border-left: var(--bw-rule) solid var(--line-strong);
  background: var(--surface);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

.node__msg p + p {
  margin-top: var(--sp-4);
}

.node__from {
  display: block;
  margin-bottom: var(--sp-4);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Artefact panel */
.artefact {
  max-width: min(100%, 62rem);
  margin-top: var(--sp-6);
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
  background: var(--bg-sunk);
}

.artefact > summary {
  padding: var(--sp-4) var(--sp-5);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-2);
  list-style: none;
}

.artefact > summary::-webkit-details-marker {
  display: none;
}

.artefact > summary::before {
  content: "▸ ";
  color: var(--signal);
}

.artefact[open] > summary::before {
  content: "▾ ";
}

.artefact__body {
  padding: 0 var(--sp-5) var(--sp-5);
  font-size: var(--step--1);
  line-height: var(--lh-loose);
  color: var(--ink-2);
}

.artefact__row {
  margin-top: var(--sp-4);
  padding-top: var(--sp-4);
  border-top: var(--bw-hair) solid var(--line);
}

.artefact__k {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 600;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--signal);
}

.artefact__note {
  margin-top: var(--sp-4);
}

.artefact__pre {
  overflow-x: auto;
  padding: var(--sp-4);
  background: var(--bg);
  border: var(--bw-hair) solid var(--line);
  border-radius: var(--r-1);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  line-height: 1.5;
}

.artefact ol,
.artefact ul {
  padding-left: 1.4em;
}

.artefact li + li {
  margin-top: var(--sp-2);
}

/* Tables — used by artefacts and prose */
.table-scroll {
  overflow-x: auto;
  margin-top: var(--sp-4);
}

.artefact table,
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step--2);
  font-family: var(--font-display);
  text-align: left;
}

.artefact th,
.prose th {
  padding: var(--sp-2) var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 600;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

.artefact td,
.prose td {
  padding: var(--sp-2) var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line);
  vertical-align: top;
  color: var(--ink-2);
}

/* Options */
.options {
  max-width: var(--measure);
  margin-top: var(--sp-7);
  display: grid;
  gap: var(--sp-3);
}

/* Outcome */
.sim__outcome {
  max-width: var(--measure);
  margin-top: var(--sp-7);
}

.outcome__body {
  margin-top: var(--sp-3);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

/* Cast */
.cast {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.cast__card h3 {
  font-size: var(--step-1);
}

.cast__role {
  margin-top: var(--sp-1);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--signal);
}

.cast__card p {
  margin-top: var(--sp-3);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step--1);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

/* Ending */
.sim__ending {
  padding-block: var(--section-y);
}

@media (max-width: 640px) {
  .option {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-2);
  }
}

.contact-band__link {
  color: var(--ink-invert);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 4px;
}

.contact-band__link:hover {
  text-decoration-color: var(--ink-invert);
}

.contact-band__status {
  margin-top: var(--sp-4);
  color: color-mix(in srgb, var(--ink-invert) 78%, transparent);
}

/* Callout — a framing note the reader should not be able to miss */
.callout {
  padding: var(--sp-5);
  border-left: var(--bw-rule) solid var(--signal);
  background: var(--signal-wash);
  font-size: var(--step-0);
}

.prose .callout strong {
  color: var(--signal);
}

/* ------------------------------------------------------------
   14. PORTRAIT
   Square corners, hairline frame, mono caption. No drop shadow.
   ------------------------------------------------------------ */

.hero__side {
  display: grid;
  gap: var(--sp-6);
  align-content: start;
}

.portrait {
  position: relative;
  margin: calc(-1 * var(--tick-len));
  padding: var(--tick-len);
}

/* Registration ticks at the corners, the same device as the plates. */
.portrait::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-strong), var(--line-strong)), linear-gradient(var(--line-strong), var(--line-strong)),
    linear-gradient(var(--line-strong), var(--line-strong)), linear-gradient(var(--line-strong), var(--line-strong)),
    linear-gradient(var(--line-strong), var(--line-strong)), linear-gradient(var(--line-strong), var(--line-strong)),
    linear-gradient(var(--line-strong), var(--line-strong)), linear-gradient(var(--line-strong), var(--line-strong));
  background-size:
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len),
    var(--tick-len) 1px, 1px var(--tick-len);
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
  background-repeat: no-repeat;
}

.portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 18%;
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
}

.portrait figcaption {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  padding-top: var(--sp-2);
  border-top: var(--bw-hair) solid var(--line);
}

@media (max-width: 900px) {
  .hero__side {
    grid-template-columns: minmax(0, 280px);
    gap: var(--sp-6);
    align-items: start;
  }
}

@media (max-width: 560px) {
  .hero__side {
    grid-template-columns: minmax(0, 1fr);
  }

  .portrait img {
    aspect-ratio: 1 / 1;
    object-position: 50% 22%;
  }
}

/* ------------------------------------------------------------
   15. ABOUT
   ------------------------------------------------------------ */

.about__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: var(--sp-8);
  align-items: start;
}

.about__grid .spec a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-7);
  }
}

/* ------------------------------------------------------------
   16. THE CUTOVER — playback
   ------------------------------------------------------------ */

.reel {
  margin-block: var(--block-y) var(--section-y);
  padding-block: var(--sp-6) var(--sp-7);
  background: var(--bg-sunk);
  border-block: var(--bw-hair) solid var(--line-2);
}

/* ---- KPI panel ---- */
.kpi {
  position: sticky;
  top: var(--header-h, 60px);
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--sp-4);
  padding-block: var(--sp-4) var(--sp-5);
  background: var(--bg-sunk);
  border-bottom: var(--bw-hair) solid var(--line-2);
}

.kpi__tile {
  min-width: 0;
}

.kpi__k {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

.kpi__v {
  display: block;
  margin-top: var(--sp-1);
  font-family: var(--font-display);
  font-variation-settings: "wdth" 84;
  font-size: var(--step-3);
  font-weight: 600;
  line-height: 1.05;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.kpi__sub {
  font-size: 0.5em;
  color: var(--ink-3);
}

.kpi__v[data-tone="bad"] {
  color: var(--risk);
}

.kpi__v[data-tone="warn"] {
  color: var(--warn);
}

.kpi__bar {
  display: block;
  height: 3px;
  margin-top: var(--sp-2);
  background: var(--line);
  overflow: hidden;
}

.kpi__bar i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--signal);
  transition: width var(--dur-4) var(--ease-precise);
}

.kpi__bar i[data-tone="warn"] {
  background: var(--warn);
}

.kpi__bar i[data-tone="good"] {
  background: var(--ok);
}

@media (max-width: 900px) {
  .kpi {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-4) var(--sp-3);
  }
}

/* ---- Stage ---- */
.reel__stage {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: var(--sp-6);
  align-items: start;
  padding-block: var(--sp-6);
}

@media (max-width: 1000px) {
  .reel__stage {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---- Plant schematic ---- */
.plant {
  margin: 0;
}

.plant svg {
  display: block;
  width: 100%;
  height: auto;
  background: var(--surface);
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
}

.plant figcaption {
  margin-top: var(--sp-3);
}

.plant__flow line {
  stroke: var(--line-2);
  stroke-width: 1;
  stroke-dasharray: 5 7;
}

[data-playing] .plant__flow line {
  animation: flow 1.4s linear infinite;
}

@keyframes flow {
  to {
    stroke-dashoffset: -12;
  }
}

.zone rect {
  fill: var(--surface-2);
  stroke: var(--line-2);
  stroke-width: 1;
  transition:
    fill var(--dur-3) var(--ease-standard),
    stroke var(--dur-3) var(--ease-standard);
}

.zone__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  fill: var(--ink-3);
}

.zone__sub {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  fill: var(--ink-4);
}

.zone[data-state="run"] rect {
  fill: var(--signal-wash);
  stroke: var(--signal);
}

.zone[data-state="run"] .zone__label {
  fill: var(--signal);
}

.zone[data-state="warn"] rect {
  fill: color-mix(in srgb, var(--warn) 16%, var(--surface));
  stroke: var(--warn);
}

.zone[data-state="warn"] .zone__label {
  fill: var(--warn);
}

.zone[data-state="crit"] rect {
  fill: color-mix(in srgb, var(--risk) 16%, var(--surface));
  stroke: var(--risk);
  stroke-width: 2;
}

.zone[data-state="crit"] .zone__label {
  fill: var(--risk);
}

.zone[data-state="done"] rect {
  fill: color-mix(in srgb, var(--ok) 16%, var(--surface));
  stroke: var(--ok);
}

.zone[data-state="done"] .zone__label {
  fill: var(--ok);
}

.zone.is-pulse rect {
  animation: zonepulse 900ms var(--ease-standard) 2;
}

@keyframes zonepulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.55;
  }
}

/* ---- Event card ---- */
.reel__event {
  min-height: 15rem;
}

.beat__tag {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--signal);
}

.beat h2 {
  margin-top: var(--sp-3);
  font-size: var(--step-3);
  max-width: 22ch;
}

.beat__line {
  margin-top: var(--sp-4);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

.beat__more {
  margin-top: var(--sp-4);
  color: var(--ink-3);
}

.beat {
  animation: beatin var(--dur-4) var(--ease-standard);
}

@keyframes beatin {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

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

/* ---- Timeline ---- */
.reel__timeline {
  /* Pins sit at 0% and 100% and are centred on the track, and the last
     rotated label runs past its pin. Make room rather than clip it. */
  padding: var(--sp-7) 3.5rem var(--sp-5) 0.5rem;
}

.track {
  position: relative;
  height: 2px;
  background: var(--line-2);
}

.track__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: var(--signal);
  transition: width var(--dur-4) var(--ease-precise);
}

.track__pin {
  position: absolute;
  top: 50%;
  width: 12px;
  height: 12px;
  padding: 0;
  transform: translate(-50%, -50%);
  background: var(--bg-sunk);
  border: 2px solid var(--line-strong);
  border-radius: var(--r-full);
  cursor: pointer;
  transition:
    background-color var(--dur-2) var(--ease-standard),
    border-color var(--dur-2) var(--ease-standard),
    transform var(--dur-2) var(--ease-standard);
}

.track__pin:hover {
  border-color: var(--signal);
  transform: translate(-50%, -50%) scale(1.25);
}

.track__pin.is-past {
  border-color: var(--signal);
  background: var(--signal);
}

.track__pin.is-active {
  border-color: var(--signal);
  background: var(--signal);
  transform: translate(-50%, -50%) scale(1.5);
}

.track__pinlabel {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  transform-origin: left top;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.02em;
  color: var(--ink-3);
  white-space: nowrap;
  pointer-events: none;
}

.track__pin.is-active .track__pinlabel {
  color: var(--signal);
}

@media (max-width: 720px) {
  .track__pinlabel {
    display: none;
  }

  .track__pin.is-active .track__pinlabel {
    display: block;
  }
}

.reel__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4);
  margin-top: var(--sp-9);
}

/* ---- Optional depth ---- */
.reel__detail {
  margin-top: var(--sp-5);
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
  background: var(--surface);
}

.reel__detail > summary {
  padding: var(--sp-4) var(--sp-5);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-2);
  list-style: none;
}

.reel__detail > summary::-webkit-details-marker {
  display: none;
}

.reel__detail > summary::before {
  content: "▸ ";
  color: var(--signal);
}

.reel__detail[open] > summary::before {
  content: "▾ ";
}

.reel__detailbody {
  padding: 0 var(--sp-5) var(--sp-5);
}

.pick {
  max-width: var(--measure);
  padding: var(--sp-5);
  border-left: var(--bw-rule) solid var(--ok);
  background: var(--bg-sunk);
}

.pick__label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-1);
  color: var(--ink);
  margin-bottom: var(--sp-3);
}

/* Glass colour indicator per line — static, not a state. */
.glass--amber {
  fill: var(--amber-glass);
  stroke: none;
}

.glass--flint {
  fill: var(--surface);
  stroke: var(--line-strong);
  stroke-width: 1;
}

/* Seven metrics rather than six, and the payback tile carries the point. */
.kpi--wide {
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.kpi__tile--hero .kpi__v {
  font-size: var(--step-4);
  font-variation-settings: "wdth" 80;
}

@media (max-width: 1100px) {
  .kpi--wide {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .kpi--wide {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Delivered-this-way against delivered-the-other-way */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step-0);
}

.compare-table th {
  padding: var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 600;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: left;
}

.compare-table td {
  padding: var(--sp-4) var(--sp-3);
  border-bottom: var(--bw-hair) solid var(--line);
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}

.compare-table td.is-good {
  color: var(--ok);
  font-weight: 600;
}

.compare-table td.is-bad {
  color: var(--risk);
  font-weight: 600;
}

.compare-table tr:last-child td {
  border-bottom: none;
}

/* ------------------------------------------------------------
   17. BUILDS
   The destination of the homepage. Plates with a screenshot,
   two across on desktop, one on a phone.
   ------------------------------------------------------------ */

.builds {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-5);
}

.build {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 0;
  overflow: hidden;
}

.build__media {
  position: relative;
  display: block;
  margin: var(--tick-len);
  margin-bottom: 0;
  aspect-ratio: 16 / 9;
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
  background: var(--bg-sunk);
  overflow: hidden;
}

/* Each screenshot is zoomed to a region a reader can actually read,
   set per build: --zoom is the image width relative to the frame and
   --fx / --fy shift it so the region of interest is in frame. The
   offsets are fractions of the frame, so the same crop holds at every
   card width. */
.build__media img {
  position: absolute;
  top: var(--fy, 0);
  left: var(--fx, 0);
  width: var(--zoom, 150%);
  max-width: none;
  height: auto;
  transition: transform var(--dur-4) var(--ease-standard);
}

/* B-01: the live operations headline and the KPI strip. */
.build[id="b-01"] .build__media {
  --zoom: 180%;
  --fx: -31%;
  --fy: -27%;
}

/* B-02: the materiality assessment heading and the register. */
.build[id="b-02"] .build__media {
  --zoom: 180%;
  --fx: -34%;
  --fy: -7%;
}

/* B-03: the generator controls and the auto / review / gap counts. */
.build[id="b-03"] .build__media {
  --zoom: 160%;
  --fx: -2%;
  --fy: -20%;
}

/* The first build runs full width, screenshot beside the copy. */
@media (min-width: 901px) {
  .builds .build:first-child {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .builds .build:first-child .build__media {
    aspect-ratio: auto;
    height: calc(100% - var(--tick-len));
    margin-right: 0;
  }

  /* Fit the height, then slide across past the sidebar. */
  .builds .build:first-child .build__media img {
    position: static;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 42% 0;
  }

  .builds .build:first-child .build__body {
    padding: var(--sp-6) var(--sp-6) var(--sp-6) var(--sp-7);
  }

  .builds .build:first-child h3,
  .builds .build:first-child h2 {
    font-size: var(--step-3);
  }
}

.build:hover .build__media img,
.build:focus-within .build__media img {
  transform: scale(1.015);
}

.build__body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-width: 0;
  padding: var(--sp-5);
}

.build__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--sp-4);
  padding-bottom: var(--sp-4);
  border-bottom: var(--bw-hair) solid var(--line);
}

.build__head > .mono:first-child {
  flex: none;
  white-space: nowrap;
  font-weight: 600;
  color: var(--signal);
}

.build__stack {
  font-size: var(--step--2);
  letter-spacing: 0.06em;
  text-align: right;
  text-wrap: pretty;
}

/* The builds section is the destination of the homepage: a full-width
   sunk band with the plates sitting proud of it. */
.section--builds {
  position: relative;
  background: var(--bg-sunk);
  border-top: var(--bw-hair) solid var(--signal);
  border-bottom: var(--bw-hair) solid var(--line-2);
}

/* A data-tick strip along the top edge announces the band, the way the
   result band on a case study is announced. */
.section--builds::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background-image: repeating-linear-gradient(
    to right,
    var(--signal) 0 1px,
    transparent 1px var(--tick-gap)
  );
  pointer-events: none;
}

.section--builds .page-grid > .rail {
  border-right-color: var(--line-2);
}

.section--builds .rail__idx {
  color: var(--signal);
}

.section--builds .section-head h2 {
  font-size: var(--step-5);
}

.section--builds .section-head {
  margin-bottom: var(--sp-6);
}

.section--builds .rule {
  margin-block: var(--sp-6) var(--sp-6);
}

.section--builds .actions {
  margin-top: var(--sp-6);
}

.build h3,
.build h2 {
  margin-top: var(--sp-4);
  max-width: 28ch;
  font-size: var(--step-2);
  font-variation-settings: "wdth" 92;
  line-height: var(--lh-tight);
}

.build__what {
  margin-top: var(--sp-3);
  max-width: var(--measure);
  font-size: var(--step-0);
  color: var(--ink);
}

.build__decision {
  margin-top: var(--sp-4);
  max-width: var(--measure);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

.build__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3) var(--sp-4);
  margin-top: auto;
  padding-top: var(--sp-4);
  border-top: var(--bw-hair) solid var(--line);
}

.build__decision {
  margin-bottom: var(--sp-5);
}

.build__link {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 4px;
}

.build__link:hover {
  color: var(--signal);
}

/* A product that is deliberately closed, rather than a missing link. */
.build__closed {
  padding: 0.15em 0.6em;
  border: var(--bw-hair) solid var(--line-2);
  border-radius: var(--r-1);
  color: var(--ink-3);
  text-transform: none;
  letter-spacing: 0.02em;
}

.builds__more {
  max-width: var(--measure);
  margin-top: var(--sp-7);
  padding-top: var(--sp-4);
  border-top: var(--bw-hair) solid var(--line-2);
  font-family: var(--font-text);
  font-optical-sizing: auto;
  font-size: var(--step-0);
  line-height: var(--lh-body);
  color: var(--ink-2);
}

.builds__more .mono {
  display: block;
  margin-bottom: var(--sp-2);
}

@media (max-width: 900px) {
  .builds {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .build__head {
    flex-direction: column;
    gap: var(--sp-1);
  }

  .build__stack {
    text-align: left;
  }

  .build__media img {
    width: 160%;
  }

  .actions .button {
    flex: 1 1 100%;
    justify-content: center;
    text-align: center;
  }

  .spec__row {
    grid-template-columns: 8ch minmax(0, 1fr);
    gap: var(--sp-3);
  }
}

/* The hero title block: the spec laid out four across under the hero,
   like the title block on a drawing. Heavy rule top and bottom, hairline
   dividers between the cells, so it reads as one boxed unit. */
.spec--block {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: 0;
  margin-top: var(--sp-8);
  border-top: var(--bw-rule) solid var(--ink);
  border-bottom: var(--bw-rule) solid var(--ink);
}

.spec--block .spec__row {
  display: block;
  padding: var(--sp-4) var(--sp-5) var(--sp-5);
  border-bottom: var(--bw-hair) solid var(--line);
  border-left: var(--bw-hair) solid var(--line);
}

.spec--block .spec__row:nth-child(4n + 1) {
  padding-left: 0;
  border-left: 0;
}

.spec--block .spec__row:nth-last-child(-n + 4) {
  border-bottom: 0;
}

.spec--block dt {
  margin-bottom: var(--sp-2);
}

.spec--block dd {
  font-size: var(--step-0);
  line-height: var(--lh-snug);
  text-wrap: pretty;
}

@media (max-width: 1023px) {
  .spec--block {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .spec--block .spec__row {
    padding-left: var(--sp-5);
    border-left: var(--bw-hair) solid var(--line);
    border-bottom: var(--bw-hair) solid var(--line);
  }

  .spec--block .spec__row:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .spec--block .spec__row:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (max-width: 640px) {
  .spec--block {
    display: block;
    margin-top: var(--sp-7);
  }

  .spec--block .spec__row,
  .spec--block .spec__row:nth-child(odd) {
    display: grid;
    grid-template-columns: 8ch minmax(0, 1fr);
    gap: var(--sp-3);
    padding: var(--sp-3) 0;
    border-left: 0;
    border-bottom: var(--bw-hair) solid var(--line);
  }

  .spec--block .spec__row:last-child {
    border-bottom: 0;
  }

  .spec--block dt {
    margin-bottom: 0;
  }

}

/* The datum rule that closes the hero sits tight under the title block,
   as the last line of the drawing frame. */
.hero .spec--block + .rule {
  margin-top: var(--sp-4);
  margin-bottom: 0;
}

/* Pager rows: the arrow sits with the title, not in a far column. */
.pager .register__row {
  grid-template-columns: 7ch minmax(0, 1fr) auto;
}

.pager .register__year {
  display: none;
}

.pager .register__id {
  text-transform: uppercase;
  letter-spacing: var(--tr-label);
  font-size: var(--step--2);
}

.pager .register__org {
  font-size: var(--step-1);
  letter-spacing: 0;
}

@media (max-width: 800px) {
  .pager .register__row {
    grid-template-columns: 7ch minmax(0, 1fr);
  }

  .pager .register__org {
    display: none;
  }
}

/* ------------------------------------------------------------
   18. ODDS AND ENDS
   ------------------------------------------------------------ */

/* Links inside a spec block, one per line so they can be tapped. */
.spec__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.spec dd a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.spec dd a:hover {
  color: var(--signal);
}

/* Timeline rows carry a date range in the id column. */
.register__row--timeline {
  grid-template-columns: 21ch minmax(0, 1fr);
}

.register__row--timeline .register__year,
.register__row--timeline .register__org {
  display: none;
}

@media (max-width: 800px) {
  .register__row--timeline {
    grid-template-columns: minmax(0, 1fr);
  }
}