/* Counterpart docs. Paper is the matte grey of a print bed, ink is the drawing,
   cobalt is the part Counterpart makes (the app icon's colour). Barlow's DIN-like
   letterforms echo the markings on measuring tools. */
:root {
  --paper: #eceee9;
  --sheet: #f7f8f5;
  --ink: #23272e;
  --ink-soft: #545b66;
  --rule: #b8beb4;
  --cobalt: #2752d6;
  --cobalt-deep: #1b3ea8;
  --measure: 68ch;
  --body: "Barlow", system-ui, sans-serif;
  --display: "Barlow Condensed", "Barlow", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.125rem/1.6 var(--body);
  font-feature-settings: "tnum" 1;
}
a { color: var(--cobalt-deep); text-underline-offset: 0.18em; }
a:hover { color: var(--cobalt); }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 3px; border-radius: 2px; }

.masthead, main, .foot { width: min(100% - 2.5rem, 70rem); margin-inline: auto; }

.masthead {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-block: 1.25rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  color: var(--ink); text-decoration: none;
  font: 600 1.5rem/1 var(--display); letter-spacing: 0.01em;
}
.brand img { border-radius: 9px; }
.masthead nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.masthead nav a { color: var(--ink-soft); text-decoration: none; font-weight: 500; font-size: 1rem; }
.masthead nav a:hover { color: var(--ink); }

/* Hero: the one drawing on the page */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  align-items: center; gap: 2rem;
  padding-block: 3.5rem 4.5rem;
  border-bottom: 1px solid var(--rule);
}
h1 {
  margin: 0 0 1.25rem;
  font: 600 clamp(3.2rem, 8vw, 6.25rem)/0.92 var(--display);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.lede { margin: 0 0 1.25rem; max-width: 36ch; font-size: 1.3rem; line-height: 1.5; }
.status { margin: 0; color: var(--ink-soft); font-size: 1rem; }

.drawing { margin: 0; }
.drawing svg { display: block; width: 100%; max-width: 30rem; height: auto; margin-inline: auto; overflow: visible; }
.tube { fill: var(--sheet); stroke: var(--ink); stroke-width: 2; }
.tube-bore { fill: none; stroke: var(--ink-soft); stroke-width: 1; stroke-dasharray: 4 3; }
.centre { stroke: var(--ink-soft); stroke-width: 1; fill: none; }
.dim { stroke: var(--ink); stroke-width: 1.25; }
.ink-fill { fill: var(--ink); }
.dim-label { font: 600 17px var(--display); fill: var(--ink); text-anchor: middle; letter-spacing: 0.02em; }
.part { fill: none; stroke: var(--cobalt); stroke-width: 16; stroke-linecap: round; stroke-linejoin: round; }
.leader { fill: none; stroke: var(--ink-soft); stroke-width: 1; }
.note { font: 500 15px var(--body); fill: var(--ink-soft); }
.note-end { text-anchor: end; }

/* The single moment of motion: the counterpart draws itself around the tube */
@media (prefers-reduced-motion: no-preference) {
  .part-clip { stroke-dasharray: 310; stroke-dashoffset: 310; animation: draw 1.1s 0.35s cubic-bezier(.6,.05,.3,1) forwards; }
  .part-hook { stroke-dasharray: 240; stroke-dashoffset: 240; animation: draw 0.8s 1.3s cubic-bezier(.6,.05,.3,1) forwards; }
  @keyframes draw { to { stroke-dashoffset: 0; } }
}

section { padding-block: 3.25rem; }
section + section { border-top: 1px solid var(--rule); }
h2 { margin: 0 0 1.5rem; font: 600 2.4rem/1.05 var(--display); }
h3 { margin: 0 0 0.35rem; font: 600 1.15rem/1.3 var(--body); }
p, li, dd { max-width: var(--measure); }

.ways-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; margin: 0; }
.ways-list dt { font: 600 1.6rem/1.1 var(--display); color: var(--cobalt-deep); margin-bottom: 0.4rem; }
.ways-list dd { margin: 0; }

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 1.6rem; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 3rem 1fr; column-gap: 1rem; }
.steps li::before {
  content: counter(step);
  grid-row: span 2;
  font: 600 2.4rem/1 var(--display); color: var(--cobalt);
}
.steps p { margin: 0; }

.needs { margin: 0 0 2rem; padding-left: 1.2rem; }
.needs li { margin-bottom: 0.6rem; }
.needs li::marker { color: var(--cobalt); }

.printers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; max-width: 52rem; }
.printer {
  display: block; padding: 1.1rem 1.25rem;
  background: var(--sheet); border: 1px solid var(--rule); border-radius: 10px;
  color: var(--ink); text-decoration: none;
}
.printer:hover { border-color: var(--cobalt); color: var(--ink); }
.printer-name { display: block; font: 600 1.3rem/1.2 var(--display); color: var(--cobalt-deep); }
.printer-what { display: block; margin-top: 0.25rem; color: var(--ink-soft); font-size: 1rem; }

.faq { max-width: 52rem; border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  cursor: pointer; list-style: none;
  padding: 1rem 2rem 1rem 0; position: relative;
  font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0.25rem; top: 0.85rem;
  font: 600 1.4rem/1 var(--display); color: var(--cobalt);
}
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 1.1rem; color: var(--ink-soft); }

.foot { padding-block: 2rem 3rem; border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 1rem; }
.foot p { margin: 0; }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-block: 2rem 3rem; }
  .drawing svg { max-width: 22rem; }
  .ways-list, .printers { grid-template-columns: 1fr; gap: 1.25rem; }
  .masthead { flex-wrap: wrap; row-gap: 0.75rem; }
  .masthead nav { width: 100%; gap: 1.25rem; }
  .masthead nav a { font-size: 0.95rem; }
}