/* Declutter-inator — set like a patent filing for an evil machine.
   Paper and ink by day, blueprint by night. The ray is the only color. */

@font-face { font-family: "Caslon"; src: url("/fonts/LibreCaslonText-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Caslon"; src: url("/fonts/LibreCaslonText-Italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Caslon"; src: url("/fonts/LibreCaslonText-Bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url("/fonts/IBMPlexMono-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url("/fonts/IBMPlexMono-Medium.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }

:root {
  --paper: #fcfcfa;
  --ink: #000000;
  --pencil: #6b6f76;
  --rule: #d9d9d3;
  --ray-a: #ff2e97;
  --ray-b: #36e0f0;
  --safe: #00a85a;
  --fine: #e08e00;
  --yours: #e5483f;
  --screen: #15131c;
  --screen-ink: #e9e6f0;
  --serif: "Caslon", "Iowan Old Style", "Palatino", Georgia, serif;
  --mono: "Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --measure: 37rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f2a55;
    --ink: #eaf1fb;
    --pencil: #a2b8dc;
    --rule: #2f5089;
    --safe: #3ee08f;
    --fine: #ffbf3c;
    --yours: #ff7a6e;
    --screen: #0a1631;
    color-scheme: dark;
  }
  body {
    /* the faint grid of drafting film */
    background-image:
      linear-gradient(to right, rgb(255 255 255 / 0.035) 1px, transparent 1px),
      linear-gradient(to bottom, rgb(255 255 255 / 0.035) 1px, transparent 1px);
    background-size: 24px 24px;
  }
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font: 400 1.1875rem/1.6 var(--serif);
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--ray-a); color: #fff; }

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: text-decoration-color 120ms;
}
a:hover { text-decoration-color: var(--ray-a); }

:focus-visible { outline: 2px solid var(--ray-a); outline-offset: 3px; }

code, pre { font-family: var(--mono); }
code { font-size: 0.84em; }

.page {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* ---------------------------------------------------------------- masthead */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 1rem;
}
.wordmark { text-decoration: none; }
.masthead nav { display: flex; gap: 1.5rem; align-items: baseline; }
.version { color: var(--pencil); }

/* ------------------------------------------------------------------ figures */

figure { margin: 0; }

figcaption {
  margin-top: 0.9rem;
  max-width: var(--measure);
  color: var(--pencil);
  font-size: 1rem;
  font-style: italic;
}
figcaption .fig { font-style: normal; color: var(--ink); margin-right: 0.25em; }

/* Fig. 1 — the machine. Everything inside is laid out on the character grid:
   x in ch (columns), y in line-heights (rows). 120 columns wide. */

.fig1 { margin: 3.25rem 0 0; }

.drawing {
  --lh: 1.25em;
  position: relative;
  width: 120ch;
  max-width: 100%;
  padding: calc(3.2 * var(--lh)) 0 calc(4 * var(--lh));
  font-family: var(--mono);
  font-size: min(13.5px, calc((100vw - 2.5rem) / 72));
  line-height: var(--lh);
}

.machine {
  margin: 0;
  font: inherit;
  white-space: pre;
  color: var(--ink);
}

.beam {
  display: inline-block;
  width: 30ch;
  background: linear-gradient(to right, var(--ray-a), #a65cff 45%, var(--ray-b));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.beam.flash { background: var(--ink); -webkit-background-clip: text; background-clip: text; }
.target { color: var(--ink); }

.leaders {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.leaders line { stroke: var(--pencil); stroke-width: 1; vector-effect: non-scaling-stroke; }

.notes { margin: 0; padding: 0; list-style: none; }
.notes li {
  position: absolute;
  white-space: nowrap;
}
.notes span {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.14em;
  color: var(--ink);
}
.notes b { font-weight: 400; font-style: normal; }

.n-viewport { left: 18ch; top: calc(0.4 * var(--lh)); }
.n-barrel   { left: 66ch; top: calc(0.4 * var(--lh)); }
.n-lever    { left: 0;    top: calc(12.15 * var(--lh)); }
.n-button   { left: 50ch; top: calc(12.15 * var(--lh)); }

.fire {
  margin-left: 0.35em;
  white-space: nowrap;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  cursor: pointer;
}
.fire:hover { text-decoration-color: var(--ray-a); }

/* Fig. 2 — a real terminal, so it keeps a terminal's colors. */

.fig2 { margin-top: 2.5rem; }

.screen {
  width: fit-content;
  max-width: 100%;
  overflow-x: auto;
  border-radius: 6px;
  background: var(--screen);
}
.term {
  margin: 0;
  padding: 1.5rem 1.75rem;
  width: max-content;
  color: var(--screen-ink);
  font-size: 0.8125rem;
  line-height: 1.38;
}
.term b { font-weight: 500; color: #fff; }
/* Block characters (█ ▌ ▒ …) are drawn as boxes exactly one cell wide, so bars
   stay solid whatever monospace font ends up rendering them. */
.term i {
  display: inline-block;
  width: 1ch;
  height: 1.1em;
  vertical-align: -0.22em;
  --fill: currentColor;
}
.term .k8 { background: var(--fill); }
.term .k7 { background: linear-gradient(to right, var(--fill) 87.5%, transparent 0); }
.term .k6 { background: linear-gradient(to right, var(--fill) 75%, transparent 0); }
.term .k5 { background: linear-gradient(to right, var(--fill) 62.5%, transparent 0); }
.term .k4 { background: linear-gradient(to right, var(--fill) 50%, transparent 0); }
.term .k3 { background: linear-gradient(to right, var(--fill) 37.5%, transparent 0); }
.term .k2 { background: linear-gradient(to right, var(--fill) 25%, transparent 0); }
.term .k1 { background: linear-gradient(to right, var(--fill) 12.5%, transparent 0); }
.term .s2 { background: var(--fill); opacity: 0.5; }
.term .s1 { background: var(--fill); opacity: 0.35; }
.term .x45 { color: #00d7ff; }
.term .x48 { color: #00ff87; }
.term .x51 { color: #00ffff; }
.term .x75 { color: #5fafff; }
.term .x81 { color: #5fd7ff; }
.term .x87 { color: #5fffff; }
.term .x105 { color: #8787ff; }
.term .x111 { color: #87afff; }
.term .x135 { color: #af5fff; }
.term .x141 { color: #af87ff; }
.term .x165 { color: #d700ff; }
.term .x171 { color: #d75fff; }
.term .x198 { color: #ff0087; }
.term .x199 { color: #ff00af; }
.term .x200 { color: #ff00d7; }
.term .x201 { color: #ff00ff; }
.term .x203 { color: #ff5f5f; }
.term .x214 { color: #ffaf00; }
.term .x238 { color: #444444; }
.term .x244 { color: #808080; }

/* ------------------------------------------------------------------- prose */

main > section { max-width: var(--measure); }
main > section.intro { max-width: none; }
.intro > p { max-width: var(--measure); }
main > section + section,
main > figure + section { margin-top: 5.5rem; }

.intro { margin-top: 1.75rem; }

h1 {
  margin: 0;
  font-weight: 400;
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

h2 {
  margin: 0 0 0.9rem;
  font-weight: 400;
  font-size: 1.75rem;
  line-height: 1.2;
  letter-spacing: -0.005em;
}

p { margin: 0 0 1rem; }

.lede {
  margin: 1.1rem 0 2rem;
  font-size: 1.375rem;
  line-height: 1.5;
}

.fine { color: var(--pencil); font-size: 1rem; }
.fine code { color: var(--ink); }

/* ----------------------------------------------------------------- install */

.install {
  display: flex;
  align-items: stretch;
  width: fit-content;
  max-width: 100%;
  margin-bottom: 0.9rem;
  border: 1px solid var(--ink);
}
.install code {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  padding: 0.95rem 1.1rem;
  font-size: 1rem;
  white-space: nowrap;
}
.copy {
  flex: none;
  min-width: 5.5rem;
  padding: 0 1.1rem;
  border: 0;
  border-left: 1px solid var(--ink);
  background: none;
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
}
.copy:hover { background: var(--ink); color: var(--paper); }

/* ------------------------------------------------------------------- lists */

.tiers { margin: 1.75rem 0 0; }
.tiers div + div { margin-top: 1.4rem; }
.tiers dt { font-weight: 700; }
.tiers dd { margin: 0.2rem 0 0 1.3rem; }
.swatch {
  display: inline-block;
  width: 0.62em;
  height: 0.62em;
  margin-right: 0.68em;
  vertical-align: 0.02em;
}
.swatch.safe { background: var(--safe); }
.swatch.fine { background: var(--fine); }
.swatch.yours { background: var(--yours); }

.claims { margin: 0; padding-left: 1.6rem; }
.claims li { padding-left: 0.35rem; }
.claims li + li { margin-top: 0.55rem; }
.claims li::marker { font-variant-numeric: oldstyle-nums; }

.commands { margin: 1.25rem 0 1.5rem; }
.commands div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--rule);
}
.commands div:last-child { border-bottom: 1px solid var(--rule); }
.commands dt code { font-size: 0.95rem; }
.commands dd { margin: 0; }

/* ------------------------------------------------------------------ guide */

.guide { max-width: var(--measure); }
.guide-head { margin-top: 3.25rem; }
.guide .lede { margin-bottom: 1rem; }
.byline { color: var(--pencil); font-size: 1rem; font-style: italic; }

.guide section { margin-top: 3.75rem; scroll-margin-top: 1.5rem; }
.guide h2 { margin-bottom: 0.75rem; }
.guide h2 .n { color: var(--pencil); margin-right: 0.15em; }
.guide h2 code { font-size: 0.8em; }
.guide h3 { margin: 2rem 0 0.4rem; font-size: 1.25rem; font-weight: 700; line-height: 1.3; }
.guide ul, .guide ol { margin: 0 0 1rem; padding-left: 1.4rem; }
.guide li + li { margin-top: 0.4rem; }
.guide b { font-weight: 700; }

kbd {
  font-family: var(--serif);
  font-size: 0.95em;
  padding: 0 0.25em;
  border: 1px solid var(--rule);
  border-radius: 3px;
}

.shortcut {
  margin-top: 2.5rem;
  padding: 1.5rem 1.6rem 0.6rem;
  border: 1px solid var(--ink);
}
.shortcut h2, .toc h2 { font-size: 1.25rem; font-weight: 700; margin: 0 0 0.5rem; }
/* the headline and the install line may run past the text column, never past the screen */
.guide-head h1 { width: min(48rem, calc(100vw - 2.5rem)); }
.shortcut { width: min(46rem, calc(100vw - 2.5rem)); }
.shortcut p { max-width: var(--measure); }
.shortcut-again .install { max-width: calc(100vw - 2.5rem); }

.toc { margin-top: 2.5rem; }
.toc ol { columns: 2 16rem; column-gap: 2.5rem; margin: 0 0 0.75rem; }
.toc li { break-inside: avoid; }

pre.cmd {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  border-left: 2px solid var(--ink);
  background: color-mix(in srgb, var(--ink) 4%, transparent);
  font-size: 0.875rem;
  line-height: 1.5;
}
pre.cmd code { font-size: inherit; }

.tools { margin: 1rem 0 1.25rem; }
.tools div {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.5rem 0;
  border-top: 1px solid var(--rule);
}
.tools div:last-child { border-bottom: 1px solid var(--rule); }
.tools dd { margin: 0; overflow-wrap: anywhere; }

/* ----------------------------------------------------------------- footer */

.colophon {
  max-width: var(--measure);
  margin-top: 6rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--pencil);
  font-size: 1rem;
}
.colophon p { margin-bottom: 0.4rem; }

/* ----------------------------------------------------------------- small screens */

@media (max-width: 46rem) {
  body { font-size: 1.0625rem; }
  .lede { font-size: 1.2rem; }

  /* the drawing keeps the machine and the start of the beam; labels become a list */
  .drawing {
    width: 80ch;
    padding: 0;
    font-size: calc((100vw - 2.5rem) / 48);
    overflow: hidden;
  }
  .masthead { font-size: 0.95rem; }
  .masthead a, .masthead span { white-space: nowrap; }
  .version { display: none; }

  .target, .leaders { display: none; }
  .notes { margin-top: 1.4rem; font-size: 1rem; line-height: 1.45; }
  .notes li { position: static; white-space: normal; }
  .notes li + li { margin-top: 0.3rem; }
  .notes span { font-size: 1rem; }
  .n-viewport, .n-barrel, .n-lever, .n-button { left: auto; top: auto; }

  .install code { font-size: 0.875rem; padding: 0.85rem 0.9rem; }
  .tools div { grid-template-columns: minmax(0, 1fr); gap: 0.1rem; }
  .shortcut { padding: 1.2rem 1.1rem 0.4rem; }
  .copy { min-width: 4.5rem; padding: 0 0.8rem; }
  .term { padding: 1.1rem 1.2rem; font-size: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}