/* Engineer's notebook: shared mockup stylesheet */

:root {
  --paper: #fbfcff;
  --ink: #131c3a;
  --ink-soft: #4a5577;
  --rule: #dde3f3;
  --rule-strong: #c3cce6;
  --blue: #2b48c8;
  --blue-wash: #eef2fd;
  --pink: #e5408a;
  --pink-ink: #c02a6c;
  --pink-wash: #fdeef5;

  --sans: "Atkinson Hyperlegible Next", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Atkinson Hyperlegible Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --step--1: 0.8125rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --step-3: clamp(1.875rem, 1.3rem + 2.4vw, 3rem);

  --gutter: clamp(1rem, 4vw, 3rem);
  --wide: 76rem;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0d1430;
    --ink: #eef1fb;
    --ink-soft: #a8b2d4;
    --rule: #222c52;
    --rule-strong: #333f6c;
    --blue: #8ea2ff;
    --blue-wash: #161f45;
    --pink: #ff6fae;
    --pink-ink: #ff8dbf;
    --pink-wash: #2a1634;
  }
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 1.5rem; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: "ss01";
}

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

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--pink-ink); }

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

.skip-link {
  position: absolute; left: var(--gutter); top: -3rem;
  background: var(--ink); color: var(--paper); padding: 0.5rem 0.75rem; z-index: 10;
}
.skip-link:focus { top: 0.75rem; }

.mono { font-family: var(--mono); }

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

/* ---------- header ---------- */
.top {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  padding-block: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--rule);
}
.wordmark {
  font-weight: 700; font-size: var(--step-1); letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none;
}
.wordmark::after { content: ""; display: inline-block; width: 0.42em; height: 0.42em; margin-left: 0.18em; background: var(--pink); border-radius: 50%; }
.top nav { display: flex; gap: clamp(0.85rem, 2.5vw, 1.75rem); font-family: var(--mono); font-size: var(--step--1); }
.top nav a { color: var(--ink-soft); text-decoration: none; padding-block: 0.25rem; }
.top nav a:hover, .top nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--pink); text-decoration-thickness: 2px; }

/* ---------- intro ---------- */
.intro { padding-block: clamp(2rem, 6vw, 3.5rem) clamp(1.75rem, 4vw, 2.5rem); max-width: 46rem; }
.intro h1 {
  font-size: var(--step-3); line-height: 1.12; font-weight: 400; letter-spacing: -0.025em;
  text-wrap: balance;
}
.intro h1 b { font-weight: 700; }
.intro p { margin-top: 1rem; color: var(--ink-soft); max-width: 38rem; text-wrap: pretty; }

.status {
  display: inline-flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.6rem;
  margin-top: 1.25rem; font-family: var(--mono); font-size: var(--step--1); color: var(--ink);
}
.status .dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--pink); box-shadow: 0 0 0 3px var(--pink-wash); }
.status .sep { color: var(--rule-strong); }

/* ---------- index (home) ---------- */
.index {
  display: grid; gap: clamp(1.5rem, 4vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: clamp(3rem, 8vw, 5rem);
}
@media (min-width: 60rem) {
  .index { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); align-items: start; }
}

.index-head {
  display: flex; justify-content: space-between; font-family: var(--mono); font-size: var(--step--1);
  color: var(--ink-soft); padding-bottom: 0.5rem; border-bottom: 1px solid var(--ink);
}

.index ol { list-style: none; padding: 0; }
.index li { border-bottom: 1px solid var(--rule); }

.row {
  display: grid; grid-template-columns: 2.25rem 1fr auto; column-gap: 0.75rem; row-gap: 0.2rem;
  padding-block: 1rem; text-decoration: none; color: var(--ink); position: relative;
}
.row .n { font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); padding-top: 0.2rem; }
.row .name { font-size: var(--step-1); font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; }
.row .state { font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); padding-top: 0.2rem; white-space: nowrap; }
.row .line { grid-column: 2 / -1; color: var(--ink-soft); font-size: 0.975rem; line-height: 1.5; }
.row .stack { grid-column: 2 / -1; font-family: var(--mono); font-size: var(--step--1); color: var(--blue); }
.row::before {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--pink);
  transform: scaleX(0); transform-origin: left; transition: transform 0.5s var(--ease-out);
}
.row:hover, .row:focus-visible { color: var(--ink); }
.row:hover::before, .row.is-active::before { transform: scaleX(1); }
.row.is-active .n { color: var(--pink-ink); }

.live { color: var(--ink); }
.live::before { content: "● "; color: var(--pink); }

/* the plate: a screenshot with notebook dimension marks */
.plate { margin: 0; }
.plate-dim {
  position: relative; height: 1.1rem; margin-bottom: 0.6rem;
  font-family: var(--mono); font-size: 0.75rem; color: var(--pink-ink); text-align: center;
}
.plate-dim::before {
  content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--pink);
}
.plate-dim span { position: relative; background: var(--paper); padding-inline: 0.5rem; }
.plate-dim i { position: absolute; top: 15%; height: 70%; width: 1px; background: var(--pink); }
.plate-dim i:first-child { left: 0; }
.plate-dim i:last-of-type { right: 0; }

.plate-frame {
  border: 1px solid var(--rule-strong); background: var(--blue-wash);
  box-shadow: 0 1px 1px rgb(19 28 58 / 0.04), 0 12px 32px -18px rgb(19 28 58 / 0.35);
  overflow: hidden;
}
.plate-frame img { width: 100%; }
.plate figcaption {
  display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; justify-content: space-between;
  margin-top: 0.65rem; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-soft);
}
.plate figcaption b { color: var(--ink); font-weight: 500; }

.index-plate { display: none; }
@media (min-width: 60rem) {
  .index-plate { display: block; position: sticky; top: 1.5rem; }
  .index-plate .plate-frame { aspect-ratio: 4 / 3.2; }
  .index-plate .plate-frame img { height: 100%; object-fit: cover; object-position: top left; }
}
.index-plate .plate-frame { position: relative; }
.index-plate .plate-frame img.is-entering { animation: wipe 0.7s var(--ease-out) both; position: absolute; inset: 0; }
@keyframes wipe {
  from { clip-path: inset(0 100% 0 0); }
  to { clip-path: inset(0 0 0 0); }
}
.plate-empty {
  display: grid; place-items: center; height: 100%; padding: 2rem; text-align: center;
  font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft);
  background:
    linear-gradient(var(--rule) 1px, transparent 1px) 0 0 / 100% 1.5rem,
    var(--paper);
}

/* ---------- entries (home, below the index) ---------- */
.entries { border-top: 1px solid var(--ink); }
.entry { padding-block: clamp(2.5rem, 7vw, 4.5rem); border-bottom: 1px solid var(--rule); }
.entry-head { display: grid; grid-template-columns: 2.25rem 1fr; column-gap: 0.75rem; max-width: 44rem; }
.entry-head .n { font-family: var(--mono); font-size: var(--step--1); color: var(--pink-ink); padding-top: 0.55rem; }
.entry h2 { font-size: var(--step-2); line-height: 1.2; letter-spacing: -0.02em; text-wrap: balance; }
.entry-head p { grid-column: 2; margin-top: 0.6rem; color: var(--ink-soft); text-wrap: pretty; }

.spec {
  grid-column: 2; margin-top: 1rem;
  display: grid; grid-template-columns: max-content 1fr; gap: 0.2rem 1.25rem;
  font-family: var(--mono); font-size: var(--step--1);
}
.spec dt { color: var(--ink-soft); }
.spec dd { color: var(--ink); }

.entry-figs {
  display: grid; gap: clamp(1rem, 3vw, 2rem); margin-top: 2rem;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 48rem) {
  .entry-figs { grid-template-columns: minmax(0, 3fr) minmax(0, 1fr); align-items: start; }
}
.phone .plate-frame { aspect-ratio: 9 / 16; border-radius: 1.1rem; }
.phone .plate-frame img { height: 100%; object-fit: cover; object-position: top; }
@media (max-width: 47.99rem) { .phone { max-width: 15rem; } }

.notes {
  margin-top: 2rem; display: grid; gap: 1.25rem 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  list-style: none; padding: 0;
}
.notes li { padding-top: 0.75rem; border-top: 1px solid var(--rule-strong); font-size: 0.975rem; line-height: 1.55; }
.notes li::before { content: "→ "; color: var(--pink); font-family: var(--mono); }

.entry-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.75rem; margin-top: 1.75rem; font-family: var(--mono); font-size: var(--step--1); }

.placeholder {
  margin-top: 2rem; padding: 2.5rem 1.5rem; border: 1px dashed var(--rule-strong);
  font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); text-align: center;
}

/* ---------- rule + contact ---------- */
.rule-line {
  padding-block: clamp(3rem, 8vw, 5rem); max-width: 50rem;
}
.rule-line p:first-child { font-family: var(--mono); font-size: var(--step--1); color: var(--pink-ink); }
.rule-line blockquote { margin-top: 0.75rem; font-size: var(--step-2); line-height: 1.3; letter-spacing: -0.015em; text-wrap: balance; }

.contact { border-top: 1px solid var(--ink); padding-block: 2.5rem 3rem; display: grid; gap: 1.5rem; }
@media (min-width: 48rem) { .contact { grid-template-columns: 1fr auto; align-items: end; } }
.contact h2 { font-size: var(--step-2); line-height: 1.2; letter-spacing: -0.02em; max-width: 30rem; text-wrap: balance; }
.contact p { margin-top: 0.5rem; color: var(--ink-soft); max-width: 34rem; }
.contact .mail {
  display: inline-block; margin-top: 1.25rem; font-family: var(--mono); font-size: var(--step-1);
  color: var(--ink); text-decoration-color: var(--pink); text-decoration-thickness: 2px;
}
.contact ul { list-style: none; padding: 0; font-family: var(--mono); font-size: var(--step--1); display: grid; gap: 0.35rem; }

.foot { padding-block: 1.25rem 2rem; border-top: 1px solid var(--rule); font-family: var(--mono); font-size: 0.75rem; color: var(--ink-soft); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ---------- story page ---------- */
.crumb { padding-top: 1.5rem; font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); }
.crumb a { color: var(--ink-soft); }

.story-head { display: grid; gap: 2rem; padding-block: 1.5rem 2.5rem; }
@media (min-width: 60rem) { .story-head { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: end; } }
.story-head h1 { font-size: var(--step-3); line-height: 1.08; letter-spacing: -0.03em; }
.story-head h1 small { display: block; margin-top: 0.4rem; font-size: var(--step-1); font-weight: 400; color: var(--ink-soft); letter-spacing: 0; }
.story-head .lead { margin-top: 1.25rem; font-size: var(--step-1); line-height: 1.45; max-width: 34rem; text-wrap: pretty; }
.story-head .spec { margin-top: 0; padding: 1.25rem 0 0; border-top: 1px solid var(--ink); }

.story { display: grid; gap: 2.5rem; padding-block: clamp(2.5rem, 6vw, 4rem); }
@media (min-width: 60rem) { .story { grid-template-columns: 12rem minmax(0, 1fr); gap: 4rem; } }
.toc { font-family: var(--mono); font-size: var(--step--1); }
.toc p { color: var(--ink-soft); margin-bottom: 0.5rem; }
.toc ol { list-style: none; padding: 0; display: grid; gap: 0.15rem; }
.toc a { color: var(--ink); text-decoration: none; display: block; padding-block: 0.25rem; }
.toc a:hover { color: var(--pink-ink); }
@media (min-width: 60rem) { .toc { position: sticky; top: 1.5rem; align-self: start; } }

.chapter { max-width: 42rem; }
.chapter + .chapter { margin-top: clamp(3rem, 7vw, 4.5rem); }
.chapter h2 { font-size: var(--step-2); line-height: 1.22; letter-spacing: -0.02em; margin-bottom: 1rem; text-wrap: balance; }
.chapter p + p { margin-top: 1rem; }
.chapter p { text-wrap: pretty; }
.chapter .plate, .chapter .flow, .chapter .phones { margin-top: 2rem; }
.chapter .plate + p, .chapter .flow + p, .chapter .notes + details { margin-top: 2rem; }
.chapter-wide { max-width: none; }

/* submission path diagram */
.flow { border: 1px solid var(--rule-strong); padding: 1.25rem; background: var(--paper); }
.flow-title { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-soft); margin-bottom: 1rem; display: flex; justify-content: space-between; gap: 1rem; }
.flow ol { list-style: none; padding: 0; display: grid; gap: 0; counter-reset: s; }
.flow li {
  counter-increment: s; position: relative;
  display: grid; grid-template-columns: 2rem 1fr; column-gap: 0.75rem; padding-bottom: 1.1rem;
}
.flow li::before {
  content: counter(s); width: 1.6rem; height: 1.6rem; border-radius: 50%;
  border: 1.5px solid var(--blue); color: var(--blue); background: var(--paper);
  display: grid; place-items: center; font-family: var(--mono); font-size: 0.75rem; position: relative; z-index: 1;
}
.flow li::after { content: ""; position: absolute; left: 0.8rem; top: 1.6rem; bottom: 0; border-left: 1.5px solid var(--rule-strong); }
.flow li:last-child { padding-bottom: 0; }
.flow li:last-child::after { display: none; }
.flow li.key::before { border-color: var(--pink); background: var(--pink-wash); color: var(--pink-ink); border-width: 2px; }
.flow b { display: block; font-weight: 700; line-height: 1.35; padding-top: 0.1rem; }
.flow span { color: var(--ink-soft); font-size: 0.95rem; }
.flow code { font-family: var(--mono); font-size: 0.85em; color: var(--blue); }
@media (min-width: 48rem) {
  .flow ol { grid-template-columns: repeat(5, 1fr); }
  .flow li { grid-template-columns: 1fr; row-gap: 0.75rem; padding-bottom: 0; padding-right: 1rem; }
  .flow li::after { left: 1.6rem; right: 0; top: 0.8rem; bottom: auto; border-left: 0; border-top: 1.5px solid var(--rule-strong); }
}

.phones { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(0.75rem, 2.5vw, 1.5rem); }
.phones .plate figcaption { display: block; }
.phones .plate figcaption b { display: block; font-family: var(--sans); font-size: 0.9rem; line-height: 1.35; margin-bottom: 0.2rem; }
@media (max-width: 40rem) {
  .phones { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 62%; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 0.5rem; }
  .phones > * { scroll-snap-align: start; }
}

details.built { margin-top: 1.5rem; border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong); }
details.built summary { cursor: pointer; padding-block: 0.85rem; font-family: var(--mono); font-size: var(--step--1); }
details.built > div { padding-bottom: 1.25rem; }

.next {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap;
  border-top: 1px solid var(--ink); padding-block: 1.5rem; text-decoration: none; color: var(--ink);
}
.next span { font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); }
.next strong { font-size: var(--step-2); letter-spacing: -0.02em; }
.next:hover strong { color: var(--pink-ink); }

/* ---------- about ---------- */
.about { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); padding-block: clamp(2rem, 6vw, 3.5rem) clamp(3rem, 7vw, 4.5rem); }
@media (min-width: 56rem) { .about { grid-template-columns: 17rem minmax(0, 1fr); } }
.about-side .plate-frame {
  aspect-ratio: 1; border-radius: 50%; width: min(100%, 14rem);
  border: 1px solid var(--rule-strong); box-shadow: none; padding: 0.375rem; background: var(--paper);
}
.about-side .plate-frame img { height: 100%; object-fit: cover; object-position: 50% 30%; border-radius: 50%; }
@media (max-width: 55.99rem) { .about-side { max-width: 10rem; } }
.about-main { max-width: 40rem; }
.about-main h1 { font-size: var(--step-3); line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 1.5rem; }
.about-main p + p { margin-top: 1rem; }
.about-main h2 { font-family: var(--mono); font-size: var(--step--1); font-weight: 400; color: var(--pink-ink); margin: 2.75rem 0 1rem; }

.log { list-style: none; padding: 0; border-top: 1px solid var(--ink); }
.log li { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding-block: 0.85rem; border-bottom: 1px solid var(--rule); }
.log li span:first-child { font-family: var(--mono); font-size: var(--step--1); color: var(--ink-soft); padding-top: 0.15rem; }
@media (max-width: 30rem) { .log li { grid-template-columns: 1fr; gap: 0.15rem; } }

.tools { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; font-family: var(--mono); font-size: var(--step--1); color: var(--blue); list-style: none; padding: 0; }
.tools-note { margin-top: 0.6rem; font-size: 0.9rem; color: var(--ink-soft); }

.heat { margin-top: 1rem; overflow: hidden; border: 1px solid var(--rule); padding: 0.75rem; }
.heat img { width: 680px; max-width: none; margin-left: auto; }
.heat-wrap { direction: rtl; overflow: hidden; }

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

.spec dd, h1, h2 { overflow-wrap: break-word; }
.story-head .spec, .built .spec { grid-column: auto; }
.entry-figs.even { grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }

/* crops: keep the evidence, drop empty capture space */
.plate-frame.crop { aspect-ratio: 1219 / 900; }
.plate-frame.crop-pathway { aspect-ratio: 1280 / 1101; }
.plate-frame.crop img, .plate-frame.crop-pathway img { height: 100%; object-fit: cover; object-position: top left; }

/* phones and tablets: the first plate leads, above the index */
@media (max-width: 59.99rem) {
  .index-plate { display: block; order: -1; }
  .index-plate .plate-frame { aspect-ratio: 4 / 3; }
  .index-plate .plate-frame img { height: 100%; object-fit: cover; object-position: top left; }
}