/* 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(648px, calc(100vh - 120px));
}
* { 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; }
.tcy { text-combine-upright: all; }

.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); }
.tentative { font: 11px/1 var(--sans); color: var(--muted); border: 1px solid var(--rule); border-radius: 999px; padding: 8px 3px; letter-spacing: 0; }
.rail nav { display: flex; gap: 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. */
.spread { 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; line-height: var(--lh); scrollbar-width: thin; }
.spread * { margin-block: 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; text-indent: 0; }
.spaced { margin-block-end: var(--lh); }
.key { color: var(--shu); font-weight: 600; }
.small { font-size: 14px; color: var(--muted); text-indent: 0; }
ul, ol { padding-inline-start: 1.6em; }
.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 { width: min(820px, 100%); 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; }

/* 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: 240px; 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); }

@media (max-width: 760px) {
  :root { --rail: 0px; --spread-h: min(576px, calc(100svh - 150px)); }
  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; }
  .tentative { padding: 3px 8px; }
  .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; }
  footer { padding: 0 12px 32px; }
  .spread { padding: 24px var(--lh); margin-bottom: 28px; }
  h2 { font-size: 23px; }
  .lead { font-size: 17px; }
  .plate { flex-direction: column; align-items: center; }
  .plate figcaption { writing-mode: horizontal-tb; }
  .colophon { height: 330px; padding: 20px 16px; }
}