/* The drafting sheet the theme pages share (/themes/, /themes/<id>/,
   /themes/format and /theme): paper, one ink, one vermilion, hairline rules.
   System fonts only: the CSP loads nothing but the site's own files. */

:root {
  --paper: #f2f0ea;
  --ink: #1b1b19;
  --muted: #6a6862;
  --rule: #cbc7bc;
  --rule-soft: #dedad0;
  --accent: #d23d08;
  --on-accent: #fff;
  --sans: "Helvetica Neue", Helvetica, Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans CJK JP", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Roboto Mono", monospace;
  --pad: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141413;
    --ink: #eae7df;
    --muted: #9b988f;
    --rule: #3a3935;
    --rule-soft: #2a2926;
    --accent: #ff5a1f;
    --on-accent: #141413;
  }
}

@media (min-width: 768px) {
  :root {
    --pad: 24px;
  }
}

/* A theme's own page is printed in the theme: its 背景 is the paper, its 前景
   the ink. The page sets --t-<colour key> (gallery: colors.css; /theme: JS).
   The vermilion stays the same in light and dark: it is the one colour on the
   page that is not the theme's. */
.theme {
  --paper: var(--t-background);
  --ink: var(--t-foreground);
  --muted: color-mix(in srgb, var(--t-foreground) 74%, var(--t-background));
  --rule: color-mix(in srgb, var(--t-foreground) 26%, var(--t-background));
  --rule-soft: color-mix(in srgb, var(--t-foreground) 12%, var(--t-background));
  --accent: #d63c06;
  --on-accent: #fff;
}

.theme.dark {
  color-scheme: dark;
}

.theme.light {
  color-scheme: light;
}

:lang(ko) {
  --sans: "Helvetica Neue", Helvetica, Arial, "Apple SD Gothic Neo", "Noto Sans CJK KR", sans-serif;
}

:lang(zh-Hans) {
  --sans: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Noto Sans CJK SC", sans-serif;
}

:lang(zh-Hant) {
  --sans: "Helvetica Neue", Helvetica, Arial, "PingFang TC", "Noto Sans CJK TC", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* The sheet: a hairline frame around the page, as tall as the screen. */

.sheet {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 16px);
  min-height: calc(100dvh - 16px);
  margin: 8px;
  border: 1px solid var(--rule);
}

@media (min-width: 768px) {
  .sheet {
    min-height: calc(100vh - 28px);
    min-height: calc(100dvh - 28px);
    margin: 14px;
  }
}

/* The bar at the top: the mark, then cells. */

.bar {
  display: flex;
  min-height: 48px;
  border-bottom: 1px solid var(--rule);
}

.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  padding: 0 var(--pad);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.glyph {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1.5px solid currentColor;
  font: 700 10px/1 var(--mono);
  letter-spacing: -0.04em;
}

.bar > :not(.mark) {
  display: flex;
  align-items: center;
  padding: 0 var(--pad);
  border-left: 1px solid var(--rule);
}

.label,
.coord,
.bar > :not(.mark) {
  font: 500 11px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.bar > a {
  color: var(--ink);
  text-decoration: none;
}

.back::before {
  content: "←";
  margin-right: 8px;
}

/* Headings: a tight grotesque, capitals where the script has them. */

h1,
h2 {
  margin: 0;
  font-weight: 700;
  overflow-wrap: anywhere;
}

h1 {
  font-size: clamp(42px, 11vw, 132px);
  line-height: 0.9;
  letter-spacing: -0.045em;
  text-transform: uppercase;
}

h2 {
  font-size: 22px;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

:lang(ja) :is(h1, h2),
:lang(ko) :is(h1, h2),
:lang(zh) :is(h1, h2) {
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.note {
  margin: 0;
  padding: 28px var(--pad);
  color: var(--muted);
}

/* The head of a page: the title, and its lede beside it on a wide screen. */

.hero {
  display: grid;
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  padding: 40px var(--pad) 18px;
}

.lede {
  max-width: 34em;
  margin: 0;
  padding: 0 var(--pad) 26px;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  }

  .hero h1 {
    padding: 72px var(--pad) 28px;
  }

  .lede {
    align-self: end;
    padding: 24px var(--pad) 30px;
    border-left: 1px solid var(--rule);
  }
}

/* The vermilion button: a square marker, the words, the arrow. */

.button {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 60px;
  padding: 0 0 0 var(--pad);
  background: var(--accent);
  color: var(--on-accent);
  font: 700 13px/1.3 var(--mono);
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.button::before {
  content: "";
  width: 9px;
  height: 9px;
  flex: none;
  background: var(--on-accent);
}

.button::after {
  content: "→";
  display: grid;
  place-items: center;
  flex: none;
  width: 60px;
  align-self: stretch;
  margin-left: auto;
  font: 400 22px/1 var(--sans);
}

.button:active {
  opacity: 0.88;
}

/* A link that goes somewhere: capitals and an arrow cell. */

.go,
.file a {
  display: inline-flex;
  align-items: center;
  padding-left: 12px;
  min-height: 40px;
  border: 1px solid var(--rule);
  font: 600 11px/1.3 var(--mono);
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.go::after,
.file a::after {
  content: "→";
  display: grid;
  place-items: center;
  align-self: stretch;
  flex: none;
  margin-left: 12px;
  width: 40px;
  border-left: 1px solid var(--rule);
  font: 400 15px/1 var(--sans);
}

.go:hover,
.go:focus-visible,
.file a:hover,
.file a:focus-visible {
  border-color: var(--ink);
}

/* The 見本: a terminal's screen and the 16 colours numbered 00–15. On a
   phone the colours are chips under the screen that take whatever height the
   board leaves; wider, they run down the screen's left edge as a proof's
   colour bar. */

.terminal {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(44px, 1fr);
  row-gap: 18px;
  font: clamp(12.5px, 3.6vw, 15px)/1.6 var(--mono);
  text-align: left;
}

.screen {
  overflow-x: auto;
}

.line {
  white-space: pre;
}

.palette {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(20px, 1fr));
  gap: 3px;
}

.swatch {
  position: relative;
  display: block;
  box-shadow: inset 0 0 0 1px rgb(127 127 127 / 0.25);
}

.swatch .index {
  display: none;
}

@media (min-width: 600px) {
  .terminal {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: none;
    column-gap: 16px;
  }

  .screen {
    grid-column: 2;
    grid-row: 1;
  }

  .palette {
    grid-column: 1;
    grid-row: 1;
    grid-template-columns: none;
    grid-template-rows: repeat(16, minmax(0, 1fr));
    gap: 2px;
    width: 58px;
    padding-left: 24px;
  }

  .swatch .index {
    display: block;
    position: absolute;
    top: 50%;
    right: calc(100% + 6px);
    font-size: 9px;
    line-height: 1;
    opacity: 0.7;
    transform: translateY(-50%);
  }
}

/* A theme's page and /theme: one board, printed in the theme. The 見本 is the
   drawing at the top; under it the title block: the name across the sheet,
   then the facts and the button as cells of one row. */

.board {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "spec" "title" "button" "facts" "aside";
  grid-template-rows: 1fr;
  grid-auto-rows: auto;
}

.board > .specimen { grid-area: spec; }
.board > .title { grid-area: title; }
.board > .button { grid-area: button; }
.board > .facts,
.board > .cells { grid-area: facts; }
.board > .aside { grid-area: aside; }

.specimen {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 20px var(--pad);
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 600px) {
  .specimen {
    flex-direction: row;
    align-items: center;
  }
}

.specimen .terminal {
  flex: 1;
  min-width: 0;
}

.board > .title {
  padding: 18px var(--pad) 22px;
}

.title .label {
  display: flex;
  flex-wrap: wrap;
  gap: 0 12px;
  margin: 0 0 12px;
}

.title .label > span + span::before {
  content: "/";
  margin-right: 12px;
  opacity: 0.5;
}

h1.name {
  font-size: clamp(38px, 10vw, 120px);
  line-height: 0.92;
  letter-spacing: -0.045em;
  text-transform: none;
}

@media (min-width: 960px) {
  .board {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
    grid-template-rows: 1fr auto auto;
    grid-template-areas: "spec aside" "title title" "facts button";
  }

  .specimen {
    padding: 48px 56px;
  }

  .specimen .terminal {
    font-size: clamp(16px, 1.75vw, 27px);
    column-gap: 28px;
  }

  .board > .aside {
    border-bottom: 1px solid var(--rule);
    border-left: 1px solid var(--rule);
  }

  .board > .title {
    padding: 26px var(--pad) 30px;
    border-bottom: 1px solid var(--rule);
  }

  h1.name {
    font-size: clamp(38px, 8.6vw, 128px);
  }

  .board > .button {
    min-height: 84px;
    border-left: 1px solid var(--rule);
  }
}

/* The sheet's foot. */

.foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: auto;
  padding: 14px var(--pad);
  border-top: 1px solid var(--rule);
}

.foot > a:not(.go) {
  font: 500 11px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-underline-offset: 3px;
}

.foot .coord {
  margin-left: auto;
}