/* Terminal — styles plain, class-free HTML as rendered from Markdown.
   Martian Mono does the talking; Fraunces Italic only ever appears as an aside.
   The specimen labels are generated here too, so the Markdown stays clean. */

/* Martian Mono, with ░ ▒ ▓ drawn into it on its own cell so diagrams line up
   at any width. */
@font-face {
  font-family: "Terminal Martian";  /* own name, so an installed Martian Mono can never stand in */
  src: url("fonts/martian-mono.51972b0e.woff2") format("woff2");
  font-weight: 300 800;
  font-stretch: 75% 112.5%;
  font-display: swap;
}

@font-face {
  font-family: "Terminal Fraunces";
  src: url("fonts/fraunces-italic.e2ddec03.woff2") format("woff2");
  font-style: italic;
  font-weight: 300 900;
  font-display: swap;
}

:root {
  --ground: #1a2cff;
  --ink: #ffffff;
  --signal: #ffd400;
  --aside: #ff9ec7;
  --quiet: #c9d0ff;

  --pad: 5rem;
  --gutter: 6rem;
  --gap: 2.5rem;
  --measure: 47.5rem;
  --hang: calc(-1 * (var(--gutter) + var(--gap)));

  --mono: "Terminal Martian", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Terminal Fraunces", Georgia, serif;
}

html {
  background: var(--ground);
  color: var(--ink);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.0625rem;
  font-weight: 300;
  font-stretch: 87.5%;
  line-height: 1.8;
}

::selection { background: var(--signal); color: var(--ground); }

a {
  color: inherit;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.2em;
}
a:hover { color: var(--signal); }

/* ---- Page frame ---------------------------------------------------------- */

header,
article,
aside,
footer {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--pad);
}

header {
  padding-top: 3.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
}
header p { margin: 0; }
header a { text-decoration: none; }
header a::before { content: "← " / ""; }
header a:hover { color: var(--signal); }
header p::before {
  content: "";
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  margin-right: 0.8em;
  border-radius: 50%;
  background: var(--signal);
}

article {
  container-type: inline-size;
  display: grid;
  grid-template-columns: var(--gutter) minmax(0, 1fr);
  column-gap: var(--gap);
  counter-reset: para fig;
  padding-bottom: 6rem;
}
article > * {
  grid-column: 2;
  margin: 0 0 3rem;
}

/* ---- Specimen labels ------------------------------------------------------
   Generated text with empty alt text (the “/ ""”), so screen readers skip it.
   Browsers without that syntax drop the rule and simply show no label. */

h1::before,
h1 + p::after,
h1 + p + p::after,
article > p:has(strong)::after,
article > p:has(em):not(h1 + p)::after,
pre:first-of-type::after,
hr:first-of-type::after,
h2:first-of-type::after,
ul:first-of-type::after {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-style: normal;
  font-weight: 400;
  font-stretch: 75%;
  line-height: 1.7;
  letter-spacing: 0;
  text-transform: none;
  white-space: pre-line;
  color: var(--quiet);
}

h1::before {
  content: "Martian Mono ExtraBold · wdth 112.5 · set lowercase" / "";
  position: absolute;
  top: calc(100% + 1.75rem);
  left: 0;
}
h1 + p::after {
  content: "Martian Mono 400 · emphasis swaps face: Fraunces Black Italic, Soft 100, Wonk 1" / "";
  margin-top: 1rem;
}
h1 + p + p::after {
  content: "Martian Mono Light 300\A wdth 87.5 · 17 / 30" / "";
}
article > p:has(strong)::after {
  content: "strong — Martian Mono ExtraBold\A wdth 112.5" / "";
}
article > p:has(em):not(h1 + p)::after {
  content: "em — Fraunces Italic\A Soft 100 · Wonk 1" / "";
}
pre:first-of-type::after {
  content: "ASCII as written · block characters drawn into Martian Mono · bar line coloured by ::first-line" / "";
  margin-top: 0.75rem;
  white-space: normal;
}
hr:first-of-type::after {
  content: "asterism, built from\A three Fraunces asterisks" / "";
  position: absolute;
  top: 50%;
  left: 7rem;
}
h2:first-of-type::after {
  content: "Martian Mono ExtraBold · wdth 112.5 · ## hung in the gutter" / "";
  margin-top: 1rem;
}
ul:first-of-type::after {
  content: "list — Martian Mono asterisks hung in the gutter" / "";
  margin-top: 1rem;
}

/* only the first paragraph with emphasis, and the first with strong, is labelled */
article > p:has(strong) ~ p:has(strong)::after,
article > p:has(em):not(h1 + p) ~ p:has(em)::after { content: none !important; }

/* paragraph labels sit below the text by default, in the right margin when there’s room */
article > p::after { margin-top: 0.75rem; }

@container (min-width: 74rem) {
  article > p:not(h1 + p)::after {
    position: absolute;
    top: 0.35em;
    left: calc(100% + 2.5rem);
    width: 16rem;
    margin: 0;
  }
}

/* ---- Title --------------------------------------------------------------- */

/* narrow enough that every word takes its own line, with slack for “bottlenecks” */
h1 {
  grid-column: 1 / -1;
  position: relative;
  max-width: 9.5em;
  margin: 7.5rem 0 8rem;
  font-size: min(9.375rem, 100cqi / 8.2);
  font-weight: 800;
  font-stretch: 112.5%;
  line-height: 0.92;
  letter-spacing: -0.06em;
  text-transform: lowercase;
  -webkit-hyphens: none;  /* ignore the ­ in “bottlenecks” until phone widths */
  hyphens: none;
}
h1::after {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.78em;
  margin-left: 0.12em;
  vertical-align: -0.04em;
  background: var(--signal);
}

/* ---- Paragraphs, numbered in the gutter ---------------------------------- */

article > p {
  position: relative;
  max-width: var(--measure);
  counter-increment: para;
  text-wrap: pretty;
}
article > p::before {
  content: counter(para, decimal-leading-zero);
  content: counter(para, decimal-leading-zero) / "";
  position: absolute;
  left: var(--hang);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--signal);
}

/* The first paragraph is the lede: wider, larger, heavier */
h1 + p {
  max-width: 65rem;
  font-size: 1.75rem;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: -0.02em;
}
h1 + p::before { top: 0.75rem; }

/* ---- Inline asides ------------------------------------------------------- */

em {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 1.2em;
  line-height: 1;
  /* Fraunces’ own word space is a fifth of an em, a third of Martian’s cell,
     so words in an aside ran together; this brings the gaps close to the mono ones */
  word-spacing: 0.25em;
  color: var(--aside);
}
h1 + p em {
  font-weight: 900;
  font-size: 1.32em;
  letter-spacing: -0.01em;
  color: var(--signal);
}
strong {
  font-weight: 800;
  font-stretch: 112.5%;
  color: var(--signal);
}

/* ---- Diagrams: ASCII in a pre, labelled in the gutter -------------------- */

pre {
  position: relative;
  counter-increment: fig;
  font-family: var(--mono);
  /* the long diagram is 79 characters of 0.65em at this width */
  font-size: min(1.125rem, (100cqi - var(--gutter) - var(--gap)) / 51.6);
  font-weight: 500;
  font-stretch: 87.5%;
  line-height: 1.6;
  white-space: pre;
  color: var(--signal);         /* the bar line takes this colour */
}
pre::first-line { color: var(--ink); }   /* the label line stays white */
pre code { font: inherit; }
pre::before {
  content: "fig." counter(fig);
  content: "fig." counter(fig) / "";
  position: absolute;
  top: 0.15rem;
  left: var(--hang);
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--signal);
}

/* ---- Section break: an asterism built from three Fraunces asterisks ------ */

hr {
  position: relative;
  height: auto;
  margin: 1rem 0 2.5rem;
  border: 0;
  overflow: visible;
  color: var(--signal);
}
hr::before {
  content: "*\A**";
  content: "*\A**" / "";
  display: block;
  width: fit-content;
  padding-top: 0.3em;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: 5rem;
  line-height: 0.5;
  letter-spacing: 0.08em;
  text-align: center;
  white-space: pre;
}

/* ---- Section heading, ## hung in the gutter ------------------------------ */

h2 {
  position: relative;
  max-width: 72rem;
  font-size: 3.5rem;
  font-weight: 800;
  font-stretch: 112.5%;
  line-height: 1.1;
  letter-spacing: -0.045em;
  text-wrap: balance;
}
h2::before {
  content: "##";
  content: "##" / "";
  position: absolute;
  left: var(--hang);
  color: var(--signal);
}

/* ---- Lists, asterisks hung in the gutter like the paragraph numbers ----- */

article > ul {
  max-width: var(--measure);
  padding: 0;
  list-style: none;
}
article > ul li {
  position: relative;
  text-wrap: pretty;
}
article > ul li + li { margin-top: 1.25rem; }
article > ul li::before {
  content: "*";
  content: "*" / "";
  position: absolute;
  left: var(--hang);
  font-size: 0.875rem;   /* the same size, weight and colour as the paragraph numbers */
  font-weight: 400;
  letter-spacing: 0;
  color: var(--signal);
}

/* ---- Aside: after the piece and outside it, so commentary on it ----------
   No number, no specimen label: it isn’t part of the specimen. Fraunces Italic,
   the face this piece keeps for asides, with “P.S.” hung in the gutter. */

aside {
  display: grid;
  grid-template-columns: var(--gutter) minmax(0, 1fr);
  column-gap: var(--gap);
  padding-bottom: 6rem;
}
aside > * {
  grid-column: 2;
  position: relative;
  max-width: 36rem;
  margin: 0 0 1.5rem;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.625rem;
  line-height: 1.35;
  color: var(--aside);
  text-wrap: pretty;
}
aside > :last-child { margin-bottom: 0; }
aside > :first-child::before {
  content: "P.S.";
  content: "P.S." / "";
  position: absolute;
  top: 0.55rem;
  left: var(--hang);
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1;
  color: var(--signal);
}
aside a { text-decoration-color: currentColor; }
aside a:hover { color: var(--signal); }

/* ---- Colophon ------------------------------------------------------------ */

footer {
  padding-bottom: 4rem;
  font-size: 0.75rem;
  font-stretch: 75%;
  color: var(--quiet);
}
footer > p {
  margin: 0;
  padding-top: 1.75rem;
  border-top: 1px solid var(--ink);
}
footer > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem 2rem;
  margin-top: 2rem;
  color: var(--ink);
}
footer > div p { margin: 0; line-height: 0.85; }
footer > div p:first-child i { margin-left: 0.25em; }
footer > div p:first-child {
  font-size: 12.5rem;
  font-weight: 800;
  font-stretch: 112.5%;
  letter-spacing: -0.06em;
}
footer > div p:last-child {
  font-size: 4rem;
  font-weight: 400;
  letter-spacing: 0.25em;
}
footer i {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 900;
  letter-spacing: 0;
  color: var(--aside);
}
footer > div p:last-child i { font-weight: 400; margin-left: 0.5em; }

/* ---- Mid-size screens ---------------------------------------------------- */

@media (max-width: 64rem) {
  :root { --pad: 2.5rem; --gutter: 3.5rem; --gap: 1.5rem; }
  h1 { margin: 5rem 0 6rem; }
  h1 + p { font-size: 1.375rem; }
  h2 { font-size: 2.75rem; }
  footer > div p:first-child { font-size: 8rem; }
  footer > div p:last-child { font-size: 2.5rem; }
}

/* ---- Phones: the gutter shrinks to a number column; big things go full width */

@media (max-width: 40rem) {
  :root { --pad: 1.625rem; --gutter: 1.375rem; --gap: 0.875rem; }

  body { font-size: 0.9375rem; line-height: 1.85; }
  header { padding-top: 1.75rem; font-size: 0.625rem; }

  /* sized so “bottle-” fits but “necks move” doesn’t */
  h1 {
    margin: 5rem 0 5.5rem;
    max-width: none;
    font-size: calc(100cqi / 5.9);
    -webkit-hyphens: manual;
    hyphens: manual;
  }
  h1::before { top: calc(100% + 1.25rem); }

  article > p::before { font-size: 0.625rem; top: 0.45em; }
  article > ul li::before { font-size: 0.625rem; top: 0.45em; }

  h1 + p,
  pre,
  h2 { grid-column: 1 / -1; }

  h1 + p { font-size: 1.1875rem; line-height: 1.5; }
  h1 + p::before {
    position: static;
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.6875rem;
  }

  /* diagrams switch to the narrowest width and scale to fit, 1rem from each edge:
     79 characters of 0.6em */
  pre {
    margin-left: calc(1rem - var(--pad));
    margin-right: calc(1rem - var(--pad));
    font-size: calc((100cqi + 2 * var(--pad) - 2rem) / 47.6);
    font-stretch: 75%;
  }
  /* the fig label sits above, out of flow, so ::first-line is still the label line */
  pre { padding-top: 1.5rem; }
  pre::before {
    top: 0;
    left: 0;
    font-size: 0.6875rem;
    line-height: 1;
  }
  pre:first-of-type::after { font-size: 0.625rem; }

  hr::before { font-size: 3.5rem; }
  hr:first-of-type::after { left: 4.75rem; }

  h2 { font-size: 2.125rem; letter-spacing: -0.05em; font-stretch: 100%; }
  h2::before { position: static; content: "## "; content: "## " / ""; }

  aside > * { grid-column: 1 / -1; font-size: 1.3125rem; }
  aside > :first-child::before {
    position: static;
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.6875rem;
  }

  footer { font-size: 0.625rem; }
  footer > div p:first-child { font-size: 5.5rem; }
  footer > div p:last-child { font-size: 1.75rem; letter-spacing: 0.15em; }
}