/* Jolt field manual. Paper-and-ink editorial layout with a live app figure; night print in dark mode. */

@font-face {
  font-family: 'Fraunces';
  src: url('assets/fonts/fraunces.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Fraunces';
  src: url('assets/fonts/fraunces-italic.woff2') format('woff2');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('assets/fonts/inter-latin.woff2') format('woff2');
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('assets/fonts/jetbrains-mono.woff2') format('woff2');
  font-weight: 100 800;
  font-display: swap;
}

:root {
  color-scheme: light;
  --paper: #f2efe6;
  --paper-deep: #e8e3d5;
  --sheet: #f8f6f0;
  --ink: #141412;
  --ink-soft: #3c3a34;
  --ink-faint: #67635a;
  --rule: rgb(20 20 18 / 0.14);
  --rule-strong: rgb(20 20 18 / 0.32);
  --volt: #c8f04b;
  --volt-ink: #3d5700;
  --on-volt: #141a04;
  --live: #1f9d63;
  --shadow: 0 1px 0 rgb(255 255 255 / 0.6) inset, 0 30px 60px -30px rgb(40 34 18 / 0.35);

  --serif: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
  --page: 1240px;
  --bar-h: calc(3.75rem + 1px);
  --ribbon-h: 3.25rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #11110f;
    --paper-deep: #1d1d19;
    --sheet: #1a1a17;
    --ink: #efece3;
    --ink-soft: #c9c5ba;
    --ink-faint: #9c988d;
    --rule: rgb(239 236 227 / 0.12);
    --rule-strong: rgb(239 236 227 / 0.3);
    --volt-ink: #d3f36d;
    --live: #3fcf8e;
    --shadow: 0 30px 60px -30px rgb(0 0 0 / 0.8);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  font-feature-settings: 'cv11', 'ss01', 'ss03';
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Paper grain, so the page reads as a printed sheet rather than flat colour. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: 0.35;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.3 0 0 0 0 0.27 0 0 0 0 0.2 0 0 0 .18 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
@media (prefers-color-scheme: dark) {
  body::before {
    mix-blend-mode: screen;
    opacity: 0.12;
  }
}

img,
svg {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
a {
  color: inherit;
}
h1,
h2,
h3,
p {
  margin: 0;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--paper-deep);
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.page {
  width: min(var(--page), 100% - 3rem);
  margin-inline: auto;
}

.skip {
  position: absolute;
  top: -5rem;
  left: 1rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
  text-decoration: none;
}
.skip:focus {
  top: 1rem;
}

/* Type */
.display {
  font-family: var(--serif);
  font-weight: 420;
  font-size: clamp(3rem, 7.4vw, 6.4rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  font-variation-settings:
    'opsz' 144,
    'SOFT' 30;
  text-wrap: balance;
}
.display em {
  font-style: italic;
  font-weight: 380;
  font-variation-settings:
    'opsz' 144,
    'SOFT' 100,
    'WONK' 1;
}
.display--md {
  font-size: clamp(2.2rem, 4.6vw, 3.8rem);
  line-height: 1.02;
}
.runner,
.step__no,
.chapter__note,
figcaption,
.spec caption {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* The highlighter: a volt-lime swipe that draws itself in behind a word. */
.hl {
  padding: 0 0.08em;
  margin: 0 -0.08em;
  background: linear-gradient(100deg, transparent 0.4%, var(--volt) 1.2% 98.6%, transparent 99.4%) no-repeat 0
    72% / var(--hl, 100%) 52%;
  color: var(--ink);
  transition: background-size 0.9s var(--ease) 0.25s;
}
@media (prefers-color-scheme: dark) {
  .hl {
    color: var(--on-volt);
    background-size: var(--hl, 100%) 88%;
    background-position: 0 60%;
  }
}
.js .hl {
  --hl: 0%;
}
.js.is-loaded .hl {
  --hl: 100%;
}

/* Top bar */
.bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px) saturate(1.2);
  border-bottom: 1px solid var(--rule);
}
.bar__inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 3.75rem;
}
.mark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 560;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.bar nav {
  margin-left: auto;
}
.bar__nav {
  display: flex;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.bar__nav a {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.4rem 0.65rem;
  border-radius: 6px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition:
    background-color 0.15s,
    color 0.15s;
}
.bar__nav a span {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
}
.bar__nav a:hover {
  background: var(--paper-deep);
  color: var(--ink);
}

/* Keys: tactile, like a physical switch cap. */
.key {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  height: 3.25rem;
  padding: 0 1.4rem 0 1.5rem;
  border: 0;
  border-radius: 10px;
  background: var(--ink);
  color: var(--paper);
  font: 600 1rem/1 var(--sans);
  text-decoration: none;
  white-space: nowrap;
  box-shadow:
    0 1px 0 rgb(255 255 255 / 0.18) inset,
    0 -3px 0 rgb(0 0 0 / 0.35) inset,
    0 10px 20px -12px rgb(0 0 0 / 0.6);
  transition:
    transform 0.12s var(--ease),
    box-shadow 0.12s var(--ease),
    background-color 0.2s;
}
.key svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: var(--volt);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.key:hover {
  background: color-mix(in srgb, var(--ink) 88%, var(--volt));
}
.key:active {
  transform: translateY(2px);
  box-shadow:
    0 1px 0 rgb(255 255 255 / 0.12) inset,
    0 -1px 0 rgb(0 0 0 / 0.35) inset,
    0 4px 10px -8px rgb(0 0 0 / 0.6);
}
.key--small {
  height: 2.4rem;
  padding: 0 1rem;
  font-size: 0.9rem;
}
.key--line {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--ink);
}
.key--line:hover {
  background: var(--ink);
  color: var(--paper);
}

/* Cover */
.cover {
  padding: 2.25rem 0 4rem;
}
.runner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule-strong);
}
.cover__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 3.5rem;
  align-items: center;
  margin-top: 3.5rem;
}
.cover__lede {
  max-width: 35rem;
  margin-top: 2rem;
  color: var(--ink-soft);
  font-size: 1.2rem;
  line-height: 1.55;
}
.cover__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
  margin-top: 2.5rem;
}
.cover__spec {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}
.cover__alt {
  display: flex;
  gap: 1.5rem;
  margin-top: 1.25rem;
}
.cover__alt a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 4px;
}
.cover__alt a:hover {
  text-decoration-color: var(--ink);
}

/* Plates: printed figures with crop marks. */
.plate {
  position: relative;
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--rule-strong);
  background: var(--sheet);
  box-shadow: var(--shadow);
}
.plate::before,
.plate::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border: 0 solid var(--ink);
}
.plate::before {
  top: -8px;
  left: -8px;
  border-width: 1px 0 0 1px;
}
.plate::after {
  bottom: -8px;
  right: -8px;
  border-width: 0 1px 1px 0;
}
.plate figcaption {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.85rem;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.78rem;
}
figcaption span {
  flex: none;
  color: var(--ink);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Fig. 1: a miniature of the app, always drawn in the app's own dark theme like a photo of a screen. */
.plate--how {
  padding: 0.85rem;
}
.mini {
  --m-rail: #0e0e10;
  --m-chat: #18181b;
  --m-raised: #232327;
  --m-fg: #edece7;
  --m-muted: #a3a29b;
  --m-line: rgb(255 255 255 / 0.08);
  overflow: hidden;
  border-radius: 10px;
  background: var(--m-chat);
  color: var(--m-fg);
  box-shadow: 0 0 0 1px rgb(0 0 0 / 0.5);
  font-family: var(--sans);
}
.mini__bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: 1.75rem;
  padding: 0 0.7rem;
  background: var(--m-rail);
  border-bottom: 1px solid var(--m-line);
}
.mini__lights {
  display: flex;
  gap: 0.3rem;
}
.mini__lights i {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: rgb(255 255 255 / 0.16);
}
.mini__title {
  font: 600 0.68rem/1 var(--mono);
  color: var(--m-muted);
}
.mini__body {
  position: relative;
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  height: var(--mini-h, 19.5rem);
}
.mini__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
  margin: 0;
  padding: 0.7rem 0;
  list-style: none;
  background: var(--m-rail);
}
.mini__home,
.mini__server {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 0.75rem;
}
.mini__home {
  background: var(--m-raised);
}
.mini__sep {
  width: 1.4rem;
  height: 2px;
  border-radius: 1px;
  background: var(--m-line);
}
.mini__server {
  background: linear-gradient(140deg, var(--g));
  color: #fff;
  font: 700 0.72rem/1 var(--sans);
  text-shadow: 0 1px 1px rgb(0 0 0 / 0.25);
  opacity: 0.55;
  transition:
    opacity 0.3s,
    border-radius 0.3s var(--ease);
}
.mini__server.is-on {
  opacity: 1;
  border-radius: 0.6rem;
}
/* The selection bar sits flush against the window edge, like in the app. */
.mini__server::before {
  content: '';
  position: absolute;
  left: -0.55rem;
  width: 0.22rem;
  height: 0;
  border-radius: 0 3px 3px 0;
  background: var(--m-fg);
  transition: height 0.3s var(--ease);
}
.mini__server.is-on::before {
  height: 1.5rem;
}
.mini__chat {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 0 0.95rem 0.8rem;
}
.mini__view {
  display: none;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.85rem;
  flex: 1;
  min-height: 0;
}
.mini__view.is-on {
  display: flex;
  animation: view-in 0.45s var(--ease);
}
@keyframes view-in {
  from {
    opacity: 0;
    translate: 0 6px;
  }
}
.mini__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 0.75rem;
  margin: 0 -0.95rem;
  padding: 0.55rem 0.95rem;
  border-bottom: 1px solid var(--m-line);
}
.mini__where {
  display: flex;
  flex: 1 1 7rem;
  flex-direction: column;
  min-width: 0;
  white-space: nowrap;
  line-height: 1.25;
}
.mini__where b {
  font-size: 0.82rem;
  font-weight: 650;
}
.mini__where span {
  color: var(--m-muted);
  font-size: 0.7rem;
}
.mini__host {
  position: relative;
  flex: none;
  padding: 0.3rem 1.55rem 0.3rem 0.55rem;
  border: 1px solid color-mix(in srgb, var(--volt) 45%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--volt) 10%, transparent);
  color: var(--volt);
  font: 600 0.64rem/1.2 var(--mono);
  white-space: nowrap;
}
.msg {
  display: grid;
  grid-template-columns: 1.85rem minmax(0, 1fr);
  column-gap: 0.65rem;
}
.msg__av {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--g));
  color: #fff;
  font: 700 0.72rem/1 var(--sans);
}
.msg__av--you {
  background: var(--volt);
  color: var(--on-volt);
}
.msg__who {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.3;
}
.msg__who em {
  padding: 0.08rem 0.35rem;
  border: 1px solid rgb(255 255 255 / 0.16);
  border-radius: 4px;
  color: var(--m-muted);
  font: 500 0.6rem/1.3 var(--mono);
  font-style: normal;
  white-space: nowrap;
}
.msg__text {
  color: #d9d8d2;
  font-size: 0.8rem;
  line-height: 1.4;
}
.js .msg--late {
  opacity: 0;
  translate: 0 6px;
  transition:
    opacity 0.4s var(--ease),
    translate 0.4s var(--ease);
}
.js .is-sent .msg--late {
  opacity: 1;
  translate: none;
}
.mini__composer {
  position: relative;
  margin-top: 0.75rem;
  padding: 0.55rem 2.4rem 0.55rem 0.75rem;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  border-radius: 0.55rem;
  background: var(--m-raised);
  color: var(--m-muted);
  font-size: 0.75rem;
}
.mini__composer.is-typing {
  color: var(--m-fg);
}
.mini__composer.is-typing [data-draft]::after {
  content: '';
  display: inline-block;
  width: 1px;
  height: 0.85em;
  margin-left: 1px;
  vertical-align: -0.1em;
  background: var(--volt);
}
.mini__pin {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  background: var(--volt);
  color: var(--on-volt);
  box-shadow: 0 0 0 2.5px #000;
  font: 700 0.68rem/1 var(--mono);
}
.mini__host .mini__pin {
  position: absolute;
  top: 50%;
  right: 0.15rem;
  translate: 0 -50%;
  width: 1.15rem;
  height: 1.15rem;
  box-shadow: none;
}
.msg__who .mini__pin {
  margin-left: 0.15rem;
}
.mini__composer .mini__pin {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  translate: 0 -50%;
}

/* The numbered notes under the figure, matching the pins on the drawing. */
.plate--how figcaption {
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.9rem;
}
.how {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: how;
  font-family: var(--sans);
  font-size: 0.86rem;
  line-height: 1.45;
  color: var(--ink-soft);
}
.how li {
  position: relative;
  padding-left: 2rem;
  counter-increment: how;
}
.how li::before {
  content: counter(how);
  position: absolute;
  left: 0;
  top: 0.05rem;
  display: grid;
  place-items: center;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  background: var(--volt);
  color: var(--on-volt);
  font: 700 0.68rem/1 var(--mono);
}

/* Ribbon */
.ribbon {
  height: var(--ribbon-h);
  overflow: hidden;
  border-block: 1px solid var(--ink);
  background: var(--volt);
  color: var(--on-volt);
}
.ribbon__track {
  display: flex;
  gap: 2rem;
  align-items: center;
  width: max-content;
  height: 100%;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  animation: ribbon 40s linear infinite;
}
.ribbon__track i {
  font-style: normal;
}
@keyframes ribbon {
  to {
    transform: translateX(-50%);
  }
}

/* Chapters */
.chapter {
  padding: 7.5rem 0 1rem;
}
.chapter__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem 3rem;
  align-items: end;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule-strong);
}
.chapter__head .display {
  max-width: 21ch;
}
.chapter__note {
  max-width: 22rem;
  padding-bottom: 0.5rem;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
}

/* 01 · Ledger: the comparison, set like a printed accounts page. */
.ledger-wrap {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 4rem;
  margin-top: 3.5rem;
  align-items: start;
}
.ledger-wrap__copy {
  color: var(--ink-soft);
  font-size: 1.1rem;
}
.ledger {
  width: 100%;
  border-collapse: collapse;
}
.ledger thead th {
  padding: 0 0 0.75rem;
  border-bottom: 2px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: left;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.ledger thead th:last-child {
  color: var(--ink);
}
.ledger tbody th,
.ledger td {
  padding: 1rem 1rem 1rem 0;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}
.ledger tbody th {
  width: 34%;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.ledger td {
  color: var(--ink-faint);
  font-size: 0.95rem;
}
.ledger td:first-of-type {
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--ink-faint) 55%, transparent);
}
.ledger td:last-child {
  position: relative;
  padding-left: 1.6rem;
  color: var(--ink);
  font-weight: 500;
}
.ledger td:last-child::before {
  content: '';
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 0.8rem;
  height: 0.5rem;
  border-radius: 2px;
  background: var(--volt);
  box-shadow: 0 0 0 1px var(--ink);
}

/* 02 · Anatomy */
.anatomy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 19rem;
  gap: 3rem;
  margin-top: 3.5rem;
  align-items: start;
}
.anatomy__plate {
  position: relative;
  margin: 0;
}
.anatomy__plate img {
  border-radius: 12px;
  box-shadow:
    0 0 0 1px var(--rule-strong),
    0 40px 80px -40px rgb(0 0 0 / 0.55);
}
.pins {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.pins li {
  position: absolute;
  left: var(--x);
  top: var(--y);
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  translate: -50% -50%;
  border-radius: 50%;
  background: var(--volt);
  color: var(--on-volt);
  font: 700 0.85rem/1 var(--mono);
  box-shadow:
    0 0 0 3px rgb(20 20 18 / 0.85),
    0 6px 16px -4px rgb(0 0 0 / 0.6);
}
.legend {
  display: grid;
  gap: 1.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: legend;
}
.legend li {
  position: relative;
  padding-left: 2.6rem;
  color: var(--ink-soft);
  font-size: 0.98rem;
  counter-increment: legend;
}
.legend li::before {
  content: counter(legend);
  position: absolute;
  left: 0;
  top: 0.1rem;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  font: 700 0.78rem/1 var(--mono);
  color: var(--ink);
}
.legend b {
  display: block;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 560;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

/* 03 · Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 3.5rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}
.step {
  padding: 2rem 2rem 1rem 0;
}
.step + .step {
  padding-left: 2rem;
  border-left: 1px solid var(--rule);
}
.step__art {
  width: 8rem;
  height: auto;
  margin-bottom: 1.5rem;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.step__art .fill {
  fill: var(--volt);
}
.step__art .tick {
  stroke: var(--on-volt);
  stroke-width: 2;
}
.step__art .flow {
  stroke-dasharray: 4 5;
  animation: dash 1.2s linear infinite;
}
@keyframes dash {
  to {
    stroke-dashoffset: -18;
  }
}
.step h3 {
  margin-top: 0.4rem;
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 520;
  letter-spacing: -0.02em;
}
.step p:last-child {
  margin-top: 0.6rem;
  color: var(--ink-soft);
}

/* 04 · Manifesto, printed in reverse. */
.chapter--ink {
  margin-top: 7.5rem;
  padding: 6rem 0;
  background: var(--ink);
  color: var(--paper);
  --rule: rgb(242 239 230 / 0.16);
  --rule-strong: rgb(242 239 230 / 0.32);
  --ink-faint: #a8a497;
}
@media (prefers-color-scheme: dark) {
  .chapter--ink {
    background: var(--volt);
    color: var(--on-volt);
    --rule: rgb(20 26 4 / 0.18);
    --rule-strong: rgb(20 26 4 / 0.38);
    --ink-faint: #3d4a12;
  }
}
.manifesto {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 4rem;
  margin: 3.5rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: promise;
}
.manifesto li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  padding: 1.75rem 0;
  border-top: 1px solid var(--rule);
  counter-increment: promise;
}
.manifesto li::before {
  content: counter(promise, decimal-leading-zero);
  grid-row: span 2;
  font: 500 0.8rem/2.4 var(--mono);
  color: var(--ink-faint);
}
.manifesto h3 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.6vw, 2.25rem);
  font-weight: 450;
  letter-spacing: -0.025em;
  line-height: 1.1;
}
.manifesto p {
  margin-top: 0.5rem;
  max-width: 30rem;
  opacity: 0.78;
}

/* 05 · Datasheet */
.datasheet {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 4rem;
  margin-top: 3.5rem;
}
.procedure {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: proc;
}
.procedure li {
  position: relative;
  padding: 0 0 2rem 3.5rem;
  counter-increment: proc;
}
.procedure li::before {
  content: counter(proc);
  position: absolute;
  left: 0;
  top: -0.35rem;
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 400;
  line-height: 1;
  color: var(--ink);
}
.procedure li::after {
  content: '';
  position: absolute;
  left: 0.6rem;
  top: 2.6rem;
  bottom: 0.4rem;
  border-left: 1px dashed var(--rule-strong);
}
.procedure li:last-child::after {
  display: none;
}
.procedure p {
  font-size: 1.1rem;
  font-weight: 500;
}
.procedure code {
  display: inline-block;
  margin-top: 0.7rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--rule-strong);
  border-radius: 8px;
  background: var(--sheet);
  font-size: 0.88rem;
}
.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.spec caption {
  padding-bottom: 0.75rem;
  text-align: left;
}
.spec th,
.spec td {
  padding: 0.85rem 0;
  border-top: 1px solid var(--rule);
  text-align: left;
  vertical-align: baseline;
}
.spec tr:last-child th,
.spec tr:last-child td {
  border-bottom: 1px solid var(--rule);
}
.spec th {
  width: 9rem;
  padding-right: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* 06 · Listing */
.listing-wrap {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 4rem;
  align-items: start;
  margin-top: 3.5rem;
}
.listing-wrap__copy {
  color: var(--ink-soft);
  font-size: 1.1rem;
}
.listing {
  margin: 0;
}
.listing pre {
  margin: 0;
  padding: 1.5rem 1.5rem 1.5rem 0;
  overflow-x: auto;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  background: repeating-linear-gradient(var(--sheet) 0 1.8em, var(--paper) 1.8em 3.6em);
  background-position: 0 1.5rem;
  font: 0.9rem/1.8 var(--mono);
}
.listing code {
  padding: 0;
  background: none;
  font-size: inherit;
}
.listing .ln {
  display: inline-block;
  width: 3rem;
  margin-right: 0.75rem;
  padding-right: 0.75rem;
  border-right: 1px solid var(--rule);
  color: var(--ink-faint);
  text-align: right;
  user-select: none;
}
.listing .k {
  color: var(--ink);
  font-weight: 700;
}
.listing .s {
  background: color-mix(in srgb, var(--volt) 55%, transparent);
  color: var(--ink);
}
@media (prefers-color-scheme: dark) {
  .listing .s {
    background: none;
    color: var(--volt);
  }
}
.listing .c {
  color: var(--ink-faint);
  font-style: italic;
}
.listing figcaption {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  text-transform: none;
  letter-spacing: 0;
}

/* 07 · Parts list */
.parts {
  margin: 3rem 0 0;
  padding: 0;
  list-style: none;
}
.part {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.6rem 0;
  border-top: 1px solid var(--rule-strong);
}
.part:last-child {
  border-bottom: 1px solid var(--rule-strong);
}
.part__no {
  font: 500 0.8rem/1 var(--mono);
  color: var(--ink-faint);
}
.part h3 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 450;
  letter-spacing: -0.03em;
  line-height: 1;
}
.part__name p {
  margin-top: 0.45rem;
  color: var(--ink-faint);
  font-size: 0.92rem;
}
.part__name p a {
  color: var(--ink-soft);
}
.part__here {
  visibility: hidden;
  padding: 0.3rem 0.65rem;
  background: var(--volt);
  color: var(--on-volt);
  font: 600 0.72rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  rotate: -2deg;
}
.part.is-current .part__here {
  visibility: visible;
}
.part .key {
  min-width: 13rem;
  justify-content: center;
}
/* Not a button: a stamped placeholder where the download will go. */
.key--soon {
  background: transparent;
  color: var(--ink-soft);
  border: 1.5px dashed var(--ink-faint);
  box-shadow: none;
  font: 600 0.8rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: default;
}
.key--soon:hover,
.key--soon:active {
  background: transparent;
  transform: none;
  box-shadow: none;
}
.part--soon h3 {
  color: var(--ink-soft);
}

/* Colophon */
.colophon {
  margin-top: 8rem;
  padding-bottom: 2.5rem;
  overflow: hidden;
}
.colophon__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}
.colophon__line {
  max-width: 22rem;
  padding-bottom: 1rem;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 420;
  line-height: 1.1;
  letter-spacing: -0.025em;
  text-align: right;
}
.colophon__line em {
  font-style: italic;
  font-variation-settings:
    'opsz' 144,
    'SOFT' 100,
    'WONK' 1;
  background: linear-gradient(transparent 62%, var(--volt) 62% 92%, transparent 92%);
}
@media (prefers-color-scheme: dark) {
  .colophon__line em {
    background: none;
    color: var(--volt);
  }
}
.colophon__word {
  font-family: var(--serif);
  font-size: clamp(8rem, 30vw, 26rem);
  font-weight: 600;
  font-variation-settings:
    'opsz' 144,
    'SOFT' 100,
    'WONK' 1;
  letter-spacing: -0.06em;
  line-height: 0.75;
  margin-left: -0.04em;
  color: var(--ink);
}
.colophon__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule-strong);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

/* Reveal on scroll. Content stays visible without scripts or with reduced motion. */
.js .reveal {
  opacity: 0;
  translate: 0 22px;
  transition:
    opacity 0.8s var(--ease),
    translate 0.8s var(--ease);
}
.js .reveal.is-visible {
  opacity: 1;
  translate: none;
}

/* On desktop the cover and the ribbon under it share exactly one screen, so type and figure scale with height. */
@media (min-width: 1001px) {
  .cover {
    display: flex;
    flex-direction: column;
    min-height: calc(100svh - var(--bar-h) - var(--ribbon-h));
    padding: clamp(0.9rem, 2.6vh, 2.25rem) 0 clamp(1.5rem, 4.5vh, 4rem);
  }
  .cover__grid {
    flex: 1;
    margin-top: clamp(1.25rem, 4.5vh, 3.5rem);
  }
  .cover .display {
    font-size: clamp(2.8rem, min(7vw, 10.5vh), 6.4rem);
  }
  .cover__lede {
    margin-top: clamp(1rem, 3.2vh, 2rem);
    font-size: clamp(1rem, 2.15vh, 1.2rem);
  }
  .cover__cta {
    margin-top: clamp(1.25rem, 4vh, 2.5rem);
  }
  .cover__alt {
    margin-top: clamp(0.75rem, 2vh, 1.25rem);
  }
  .mini {
    --mini-h: clamp(16rem, 40vh, 21rem);
  }
}

@media (max-width: 1080px) {
  .bar__nav {
    display: none;
  }
  .bar__inner {
    justify-content: space-between;
  }
}

@media (max-width: 1000px) {
  .cover__grid,
  .anatomy,
  .datasheet,
  .listing-wrap,
  .ledger-wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
  }
  .chapter__head {
    grid-template-columns: 1fr;
  }
  .chapter__note {
    grid-column: 1;
  }
  .steps,
  .manifesto {
    grid-template-columns: 1fr;
  }
  .step + .step {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--rule);
  }
  .part {
    grid-template-columns: 2rem minmax(0, 1fr);
  }
  .part__here,
  .part .key {
    grid-column: 2;
    justify-self: start;
  }
  .part .key {
    min-width: 0;
  }
  .part:not(.is-current) .part__here {
    display: none;
  }
}

@media (max-width: 600px) {
  .runner span:not(:first-child) {
    display: none;
  }
  .chapter {
    padding-top: 5rem;
  }
  .pins li {
    width: 1.4rem;
    height: 1.4rem;
    font-size: 0.7rem;
  }
  .ledger tr {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 1rem;
  }
  .ledger thead th:first-child {
    display: none;
  }
  .ledger tbody th {
    grid-column: 1 / -1;
    width: auto;
    padding: 1rem 0 0.35rem;
    border-bottom: 0;
    font-size: 1.1rem;
  }
  .ledger td {
    padding-top: 0.25rem;
    font-size: 0.88rem;
  }
  .ledger td:last-child::before {
    top: 0.6rem;
  }
  .colophon__line {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .js .reveal {
    opacity: 1;
    translate: none;
  }
}