/* Draft site, set vertically like a book. No external fonts, scripts or trackers.
   Every column of text sits between two ruled lines: line heights, block sizes and
   block margins inside a spread are whole multiples of --lh. */
:root {
  --washi: #f4efe4;
  --paper: #fbf8f1;
  --ink: #2b2925;
  --muted: #6e685d;
  --shu: #b0442c;          /* vermilion accent */
  --shu-soft: #f3e1d8;
  --rule: #e2d2c1;         /* ruled lines between columns */
  --grid: #d9a594;         /* manuscript grid */
  --serif: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --sans: "Yu Gothic UI", "Yu Gothic", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --lh: 36px;              /* column pitch = distance between ruled lines */
  --rail: 84px;
  --spread-h: min(576px, calc(100vh - 96px));  /* a whole sheet fits the screen */
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--washi); color: var(--ink); font: 17px/1.9 var(--serif); }
a { color: var(--shu); text-underline-offset: 4px; }
img { max-width: 100%; height: auto; display: block; }
/* Upright half-width letters sit on the Latin baseline, so a descender (g) and the next
   ascender (l) meet in a vertical line. Full-width forms centre each letter in its cell. */
:is(.spread, .rail, .colophon, .band-title, .plate figcaption) { font-variant-east-asian: full-width; }
.tcy { text-combine-upright: all; font-variant-east-asian: normal; }

.draft-banner { position: fixed; inset: 0 0 auto 0; z-index: 30; padding: 4px 12px; background: #3d3426; color: #f6ecd8; font: 12px/1.6 var(--sans); text-align: center; }

/* Right-hand rail: brand and pages, set vertically. Latin letters stand upright. */
.rail { position: fixed; z-index: 20; top: 0; right: 0; bottom: 0; width: var(--rail); padding: 44px 0 24px; background: var(--paper);
  border-left: 1px solid var(--rule); writing-mode: vertical-rl; text-orientation: upright; display: flex; align-items: center; gap: 28px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font: 600 24px/1 var(--serif); letter-spacing: .12em; }
.brand-mark { width: 30px; height: 30px; border: 2px solid var(--ink); border-radius: 4px; background:
  linear-gradient(90deg, transparent 0 30%, var(--grid) 30% 33%, transparent 33% 64%, var(--grid) 64% 67%, transparent 67%),
  linear-gradient(var(--grid) 1px, transparent 1px) 0 2px / 100% 33%, var(--paper); }
/* A label never breaks across columns: on a short screen the menu runs on into a second column. */
.brand, .rail nav a { flex-shrink: 0; }
.rail nav { display: flex; flex-wrap: wrap; align-content: center; gap: 4px 22px; font-size: 15px; letter-spacing: .08em; }
.rail nav a { color: var(--muted); text-decoration: none; padding-inline: 4px; border-inline-start: 2px solid transparent; }
.rail nav a:hover, .rail nav a[aria-current="page"] { color: var(--ink); border-inline-start-color: var(--shu); }

main { padding: 56px calc(var(--rail) + 32px) 24px 32px; }

/* A spread is one vertical page read right to left, on ruled paper. The rules are
   drawn every --lh from the right edge of the content box and scroll with the text
   (background-attachment: local) when a page is wider than the screen. */
.spread, .pages { writing-mode: vertical-rl; text-orientation: upright; width: 100%; height: var(--spread-h); max-width: 1120px; margin: 0 auto 44px;
  padding: 36px var(--lh); overflow-x: auto; overflow-y: hidden; background-color: var(--paper); border: 1px solid var(--rule); box-shadow: 0 10px 30px #4a3a2412;
  background-image: repeating-linear-gradient(to left, transparent 0 calc(var(--lh) - 1px), var(--rule) calc(var(--lh) - 1px) var(--lh));
  background-origin: content-box; background-clip: content-box; background-attachment: local; line-height: var(--lh); scrollbar-width: thin; }
/* A section longer than a phone screen is written as several pages. On a wide screen
   they run on as one spread; only a phone stacks them (see the media query). */
.pages > .spread { display: contents; }
/* A heading that opens a later page of the run keeps a blank column before it. */
.pages > .spread + .spread > h2:first-child { margin-block-start: var(--lh); }
/* A sheet is only as wide as its text (at least half the page), so a short section is
   not a mostly empty sheet. */
.spread, .pages { width: fit-content; min-width: min(100%, 560px); margin-inline: auto; }
.hero { width: 100%; }
/* A short note at the end is a narrow slip on every screen, not a mostly empty sheet. */
.spread.slip { width: fit-content; min-width: 0; }
.spread * { margin-block: 0; }
/* Nothing trails the last column, so a full page does not scroll sideways. */
.spread > :last-child { margin-block-end: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: .06em; }
/* A heading stays inside one column (two columns when it has a line break). */
h2 { font-size: 26px; line-height: var(--lh); margin-block-end: var(--lh); }
/* The vermilion mark is positioned so it never widens the column. */
h2 { position: relative; padding-top: 26px; }
h2::before { content: ""; position: absolute; top: 4px; right: 12px; width: 12px; height: 12px; background: var(--shu); }
h3 { font-size: 18px; line-height: var(--lh); color: var(--shu); }
p, li, dt, dd, summary, figcaption { line-height: var(--lh); }
p { text-indent: 1em; }
.lead { font-size: 19px; }
.spaced { margin-block-end: var(--lh); }
/* Every paragraph starts one square down, as on manuscript paper; a date and name line does not. */
.byline { text-indent: 0; }
.key { color: var(--shu); font-weight: 600; }
.small { font-size: 14px; color: var(--muted); }
ul { padding-inline-start: 1.6em; }
/* Numbers are kanji written into the text, so they sit upright in the column like
   every other character (a list marker would lie on its side). */
ol { list-style: none; padding: 0; counter-reset: item; }
ol > li::before { counter-increment: item; content: counter(item, cjk-decimal) "　"; color: var(--shu); font-weight: 600; }
/* Items led by a word in vermilion, each starting a new column. */
.plain { list-style: none; padding: 0; }
/* Hanging indent: the label stands alone at the top of the first column and every
   column of the text starts below it, so the label reads as a heading. */
.hang { --hang: 5em; }
.hang > li { padding-inline-start: var(--hang); text-indent: calc(-1 * var(--hang)); margin-block-end: var(--lh); }
.hang .key { display: inline-block; inline-size: var(--hang); text-indent: 0; }
/* Steps: the kanji number hangs, every column of the step starts below it. */
.steps > li { padding-inline-start: 2em; text-indent: -2em; margin-block-end: var(--lh); }
.steps > li:last-child { margin-block-end: 0; }
.steps:not(:last-child) { margin-block-end: var(--lh); }
/* Questions: the question takes its own column, the answer is indented below it. */
.qa > li { padding-inline-start: 1em; margin-block-end: var(--lh); }
/* No empty column after the last item of a section. */
.hang > li:last-child, .qa > li:last-child { margin-block-end: 0; }
.pages > .spread:not(:last-child) :is(.hang, .qa, .steps, .faq) > li:last-child { margin-block-end: var(--lh); }
.qa .key { display: block; margin-inline-start: -1em; }
/* One-line items run column after column, like a list of specifications. */
.hang.tight > li, .pages > .spread:not(:last-child) .hang.tight > li:last-child { margin-block-end: 0; }
.pledge { font-size: 20px; font-weight: 600; color: var(--shu); }
/* Lines only for a phone (the hero there is shorter). */
.narrow { display: none; }
/* The hero's button stands in the middle of its column. */
.hero .buttons { justify-content: center; }
/* Questions: the question in vermilion on its own column, the answer from the
   next column, one square down; a blank column before each question. */
.faq > li { padding-inline-start: 1em; margin-block-end: var(--lh); }
.faq > li:last-child { margin-block-end: 0; }
.faq .key { display: block; margin-inline-start: -1em; }
/* A section made only of pictures: its title stands on the page itself, set
   vertically like the captions, with no sheet of manuscript paper. */
.band-title { writing-mode: vertical-rl; text-orientation: upright; margin: 0; height: 440px; line-height: var(--lh); }
/* A step: its kanji number hangs, the text below it. */
.step { text-indent: 0; padding-inline-start: 2em; text-indent: -2em; }
.note { padding: 12px 0; background: var(--shu-soft); border-top: 3px solid var(--shu); text-indent: 0; }
.todo { background: #fde3dc; color: #8a2f1c; font-family: var(--sans); font-size: .82em; }
.ui, kbd { font-family: var(--sans); font-size: .86em; padding: 3px 0; border: 1px solid #d8cbb9; border-radius: 4px; background: #fff; }

/* Hero title: one manuscript square per character, two ruled columns per title column. */
.genko-title { --cell: 60px; display: flex; flex-direction: column; font-size: 44px; letter-spacing: 0; margin-block-end: var(--lh); }
.genko-title .col { display: flex; align-items: center; block-size: calc(var(--lh) * 2); }
.genko-title .col span { inline-size: var(--cell); block-size: var(--cell); line-height: calc(var(--cell) - 2px); text-align: center;
  border: 1px solid var(--grid); margin-inline-start: -1px; background: #fffdf8; }
.genko-title .col span:first-child { margin-inline-start: 0; }

/* Badges and buttons: each sits inside whole columns, so the text after them stays on the rules. */
.badges { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0 10px; margin-block-end: var(--lh); }
.badges li { block-size: calc(var(--lh) - 6px); margin-block: 3px; padding-inline: 12px; border: 1px solid var(--shu); color: var(--shu);
  font-size: 15px; line-height: calc(var(--lh) - 8px); }
.buttons { display: flex; flex-wrap: wrap; gap: 0 14px; margin-block-end: var(--lh); }
.button { display: inline-block; block-size: calc(var(--lh) * 2 - 8px); margin-block: 4px; padding-inline: 16px; border: 1px solid var(--ink);
  line-height: calc(var(--lh) * 2 - 10px); background: var(--ink); color: var(--paper); text-decoration: none; font-size: 16px; letter-spacing: .1em; text-indent: 0; }
.button:hover { background: var(--shu); border-color: var(--shu); color: #fff; }
.button.quiet { background: transparent; color: var(--ink); }
.button.quiet:hover { color: #fff; }
.button[aria-disabled="true"] { background: #a69c8c; border-color: #a69c8c; cursor: not-allowed; }

/* Short items side by side (in vertical-rl a column flex runs right to left). */
.items { display: flex; flex-direction: column; flex-wrap: wrap; }
.item { margin-block-end: var(--lh); }
.item p { text-indent: 0; }

/* Collapsible details and tables: no borders on the block axis, so widths stay whole columns. */
details { padding-block: 0; padding-inline: .8em; background: #fff; box-shadow: inset 0 0 0 1px var(--rule); }
summary { cursor: pointer; color: var(--shu); font-weight: 600; }
details p { text-indent: 0; }
table { border-collapse: separate; border-spacing: 0; font-size: 15px; margin-block-end: var(--lh); }
th, td { padding: 12px 0; line-height: var(--lh); vertical-align: top; background: #fff; box-shadow: inset 0 0 0 .5px var(--rule); }
th { color: var(--shu); font-weight: 600; white-space: nowrap; background: var(--paper); }

/* Images stay horizontal, with a vertical caption on the right. */
.plate { max-width: 1120px; margin: 0 auto 44px; display: flex; flex-direction: row-reverse; justify-content: center; align-items: flex-start; gap: 22px; }
.plate img, .plate video { width: min(820px, 100%); height: auto; border: 1px solid var(--rule); box-shadow: 0 10px 30px #4a3a2418; }
.plate figcaption { writing-mode: vertical-rl; text-orientation: upright; font-size: 14px; color: var(--muted); max-height: 520px; }
/* Step pictures: smaller, the toolbar pictures one above the other, the caption is the step itself. */
/* ためし書き: the editor itself, filling the window (its own note says nothing is
   saved). On a phone only a note is shown, since the editor is made for a computer. */
.demo { width: 100%; }
.demo iframe { display: block; width: 100%; height: max(600px, calc(100vh - 42px)); border: 1px solid var(--rule); background: #f5f6f3; box-shadow: 0 10px 30px #4a3a2418; }
.demo-phone { display: none; }
.plate.step .shots { display: flex; flex-direction: column; gap: 14px; }
.plate.step { align-items: center; }
.plate.step figcaption { font-size: 16px; color: var(--ink); line-height: 1.9; padding-inline-start: 2em; text-indent: -2em; }

/* Source pages: code reads horizontally, coloured at build time, wrapped so a phone
   never scrolls sideways. */
.code-page { max-width: 1120px; margin: 0 auto 44px; padding: 28px 32px; background: var(--paper); border: 1px solid var(--rule); font: 15px/1.8 var(--sans); }
.code-page h1 { font: 600 20px/1.5 var(--sans); letter-spacing: 0; margin: 0 0 12px; overflow-wrap: anywhere; }
.code-page p { margin: 0 0 12px; }
.code-page code { font-family: Consolas, "BIZ UDGothic", monospace; font-size: .92em; }
.crumb { font-size: 13px; color: var(--muted); }
.download { font-weight: 600; }
.table-wrap { overflow-x: auto; }
.files { border-collapse: collapse; font-size: 13px; width: 100%; }
.files th, .files td { text-align: left; padding: 6px 10px; overflow-wrap: anywhere; border-bottom: 1px solid var(--rule); vertical-align: top; }
.files .num { text-align: right; white-space: nowrap; }
.files .sha { font-family: Consolas, monospace; font-size: 11px; color: var(--muted); word-break: break-all; }
pre.code { margin: 0; padding: 12px 0; background: #fffdf8; border: 1px solid var(--rule); font: 13px/1.65 Consolas, "BIZ UDGothic", "Yu Gothic", monospace;
  white-space: pre-wrap; overflow-wrap: anywhere; counter-reset: line; tab-size: 2; }
pre.code .l { display: block; position: relative; padding: 0 12px 0 4.4em; min-height: 1.65em; }
pre.code .l::before { counter-increment: line; content: counter(line); position: absolute; left: 0; width: 3.4em; text-align: right; color: #b7ab98; user-select: none; }
pre.code .c { color: #7b8a6e; font-style: italic; }
pre.code .s { color: #a8462c; }
pre.code .k { color: #3d4f9a; font-weight: 600; }
pre.code .n { color: #8a5a00; }
pre.code .t { color: #2f6f73; }
pre.code .a { color: #7a3f8f; }

/* Colophon (okuzuke): each item is its own column. */
footer { padding: 0 calc(var(--rail) + 32px) 48px 32px; }
.colophon { writing-mode: vertical-rl; text-orientation: upright; width: 100%; max-width: 1120px; height: 312px; margin: 0 auto; padding: 24px 32px; overflow-x: auto;
  font-size: 14px; line-height: var(--lh); color: var(--muted); border-top: 3px double var(--rule); border-bottom: 3px double var(--rule); }
.colophon > * { display: block; }
.colophon .title { color: var(--ink); font-size: 17px; font-weight: 600; }
.colophon .sub { margin-block-end: var(--lh); }
.colophon a { color: var(--muted); text-decoration: none; }
.colophon a:hover, .colophon a[aria-current="page"] { color: var(--ink); }
.colophon .copy { margin-block-start: var(--lh); }

/* On a wide screen a section and its picture (or two short sections) share a band,
   read right to left like facing pages of a book; bands run top to bottom in reading
   order, so the eye never zig-zags. A band too wide for the window wraps. */
@media (min-width: 761px) {
  main { max-width: 1680px; margin: 0 auto; }
  .row { display: flex; flex-flow: row-reverse wrap; justify-content: center; align-items: center; gap: 44px 32px; margin-block-end: 56px; }
  .row > .spread, .row > .pages, .row > .plate { margin: 0; }
  .spread, .pages { min-width: 0; max-width: 100%; }
  /* The hero is as wide as the bands below it (25 columns). The title takes the
     first columns on the right; blank columns part the title, the description,
     the pledge and the button. */
  .hero { width: calc(var(--lh) * 27 + 2px); }
  /* A hero with only a few lines is as wide as its text and shares the band. */
  .hero.short { width: fit-content; }
  .hero .genko-title { margin-block: 0 calc(var(--lh) * 2); }
  /* The lead stays in one column on a short screen, where the sheet is lower. */
  .hero .lead { font-size: min(20px, calc((var(--spread-h) - 72px) / 25)); }
  .hero p:not(.lead, .pledge) { font-size: 18px; }
  .hero .pledge { font-size: 24px; margin-block-start: calc(var(--lh) * 3); }
  .hero .buttons { margin-block: calc(var(--lh) * 3) 0; }
  .plate { max-width: 100%; }
  .plate img, .plate video { width: 520px; max-width: 100%; }
  .plate.step img { width: 260px; }
  .plate.step > img.native { width: 260px; }
  .row.steps { column-gap: 20px; }
  main:has(.demo) { padding: 30px calc(var(--rail) + 12px) 12px 12px; }
  main:has(.demo) .row { margin-bottom: 0; }
  /* Set the whole step vertically, caption on the right, so the figure is only as
     wide as its picture and caption (a vertical caption inside a horizontal box
     was sized as if it took two columns). */
  .plate.step { writing-mode: vertical-rl; flex-direction: column-reverse; justify-content: flex-start; height: 440px; }
  .plate.step .shots { writing-mode: horizontal-tb; }
  main > .code-page { margin: 0 auto 44px; }
}

/* A laptop screen is short: the rail is set smaller, so the brand and four pages fit in one column. */
@media (min-width: 761px) and (max-height: 820px) {
  .rail { gap: 18px; padding-top: 36px; }
  .brand { font-size: 20px; }
  .rail nav { column-gap: 14px; font-size: 14px; }
}
@media (max-width: 760px) {
  /* Pages are written to fit 360px wide and 504px tall without sideways scrolling. */
  :root { --rail: 0px; --lh: 32px; --spread-h: 504px; }
  body { font-size: 16px; }
  .rail { position: sticky; top: 22px; bottom: auto; width: auto; height: auto; padding: 10px 14px; writing-mode: horizontal-tb; flex-wrap: wrap; gap: 6px 18px;
    border-left: 0; border-bottom: 1px solid var(--rule); justify-content: space-between; }
  .brand { font-size: 19px; letter-spacing: .06em; }
  .rail nav { gap: 14px; font-size: 13px; }
  .rail nav a { padding: 2px 0; border: 0; border-bottom: 2px solid transparent; }
  .rail nav a[aria-current="page"] { border-bottom-color: var(--shu); }
  main { padding: 34px 12px 12px; }
  .row { display: contents; }
  footer { padding: 0 12px 32px; }
  .spread { width: 100%; min-width: 0; padding: 24px calc(var(--lh) / 2); margin-bottom: 28px; }
  /* A short section is a slip as wide as its text, not a mostly empty sheet. */
  .spread.fit { width: fit-content; margin-inline: auto; }
  .band-title { writing-mode: horizontal-tb; height: auto; margin: 0 0 16px; padding: 0 0 0 22px; }
  /* Set across, letters keep their own widths. */
  :is(.rail, .band-title, .plate figcaption) { font-variant-east-asian: normal; }
  .band-title::before { top: 50%; right: auto; left: 0; transform: translateY(-50%); }
  [id] { scroll-margin-top: 164px; }  /* clear the sticky menu (two lines) when a link jumps here */
  /* The pages of a section are tiers (dan) of one sheet: one outer border, a thin rule
     between tiers, read top to bottom, each tier right to left. */
  .pages { writing-mode: horizontal-tb; display: block; width: auto; height: auto; padding: 0; margin-bottom: 28px; overflow: visible; background: var(--paper); }
  .pages > .spread { display: block; margin: 0; border: 0; box-shadow: none; }
  .pages > .spread + .spread { border-top: 1px solid var(--rule); }
  .pages > .spread + .spread > h2:first-child { margin-block-start: 0; }
  .pages > .spread:not(:last-child) :is(.hang, .qa, .steps, .faq) > li:last-child { margin-block-end: 0; }
  h2 { font-size: 22px; letter-spacing: .04em; }  /* 18 characters fit one column */
  .lead { font-size: 17px; }
  /* A phone cannot add a Chrome extension, so the hero keeps to its words. */
  .hero .buttons { display: none; }
  .hero .more { display: none; }
  .hero .narrow { display: block; }
  /* Title, a blank column and four lines: nine columns fit a 360px screen. */
  .hero { padding: 24px 12px; }
  .demo { display: none; }
  .spread.demo-phone { display: block; }
  .plate { flex-direction: column; align-items: center; }
  .plate figcaption { writing-mode: horizontal-tb; }
  .plate.step img { width: auto; }
  .plate.step figcaption { align-self: stretch; height: auto; }
  .code-page { padding: 16px 12px; }
  pre.code { font-size: 12px; }
  pre.code .l { padding-left: 3.6em; }
  pre.code .l::before { width: 2.8em; }
  .colophon { height: 330px; padding: 20px 14px; }
  /* Rules (ご利用について) on a phone: the label runs into its text and items follow
     column after column, so a sheet is not left half empty. */
  .rules > li { padding-inline-start: 0; text-indent: 0; margin-block-end: 0; }
  .pages > .spread:not(:last-child) .rules > li:last-child { margin-block-end: 0; }
  .rules .key { display: inline; inline-size: auto; }
  .rules .key::after { content: "　"; }
  .pages .byline.spaced { margin-block-end: 0; }
  /* No blank column before the copyright, so the colophon fits a 360px screen. */
  .colophon .copy { margin-block-start: 0; }
}