/* Bjook on screen — the same book as book.css sets for paper, reflowed.
   Loaded after kit.css, which supplies the colours, dark mode and focus
   ring. The fonts and the --font-* / --head-* / --folio-* values are
   written above this file by `bjook site`, from the book's book.toml.
   A book overrides anything here in its own site.css.

   One poem to a page, as in print. Reading sizes are rem on kit.css's 6px
   rhythm: poems are 18/30, the small type 12/18 and 14/24. Everything that
   changes with the width of the window does it by itself, through flex
   wrapping, CSS columns and clamp(): there are no breakpoints in this file.
   See RULES.md "Bjook". */

body {
  font-family: var(--font-text), serif;
  font-size: 1.125rem;
  line-height: 1.875rem;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  font-variant-numeric: oldstyle-nums;
}
p { font-family: inherit; }

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { color: var(--color-accent-hover); }

/* A poem page is one reading column. The front page and the shelf run the
   full width of the window. */
.page {
  max-width: 36rem;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) 1.5rem clamp(3rem, 8vw, 6rem);
}
.page.wide {
  max-width: none;
  padding-inline: clamp(1.5rem, 6vw, 6rem);
}

/* ---- The running head: where you are, and the way back up ---- */
.head {
  font-family: var(--font-head), var(--font-mono);
  font-weight: var(--head-weight);
  font-size: 0.75rem;
  line-height: 1.125rem;
  text-align: center;
  margin: 0 0 3rem;
}
.head a {
  display: inline-block;
  padding: 0.8125rem 0.75rem;   /* a 44px target around 18px of type */
  text-decoration: none;
}
.head a:hover { text-decoration: underline; }

/* ---- A poem: flush left, long lines turn over with a hanging indent ---- */
.poem-title {
  font-family: var(--font-display), serif;
  font-size: 1.375rem;
  line-height: 1.875rem;
  font-style: italic;
  font-weight: normal;
  margin: 0 0 1.875rem;
}
.stanza { margin: 0 0 1.875rem; }
.line {
  padding-left: 2em;
  text-indent: -2em;
  white-space: pre-wrap;
}
.poem-end {
  text-align: center;
  margin: 1.875rem 0 0;
}

/* ---- Foot of a poem: previous, where you are, next ---- */
.turn {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0 1.5rem;
  align-items: start;
  margin-top: 3.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  line-height: 1.5rem;
}
.turn a {
  display: block;
  min-height: 2.75rem;
  padding: 0.625rem 0;
  text-decoration: none;
}
.turn a:hover { text-decoration: underline; }
.turn .next { text-align: right; }
.turn .folio {
  font-family: var(--font-folio), serif;
  font-weight: var(--folio-weight);
  font-size: 1rem;
  padding: 0.625rem 0;
}

/* ---- The book's front page: title, author, contents, colophon ---- */
.book-title {
  font-family: var(--font-title), serif;
  font-weight: normal;
  font-size: clamp(3rem, 1rem + 10vw, 10.5rem);
  line-height: 1;
  margin: 0 0 1.5rem;
}
.book-author { margin: 0 0 3.75rem; }

.contents h2,
.colophon h2 {
  font-family: var(--font-display), serif;
  font-size: 1.375rem;
  line-height: 1.875rem;
  font-style: italic;
  font-weight: normal;
  margin: 0 0 1.875rem;
}
/* As many columns as fit: one on a phone, four or five on a wide screen. */
.contents ol {
  list-style: none; margin: 0 0 3.75rem; padding: 0;
  columns: 16rem;
  column-gap: 3rem;
}
.contents li { break-inside: avoid; }
.contents a {
  display: grid;
  grid-template-columns: 2em 1fr;
  gap: 0 1em;
  padding: 0.4375rem 0;         /* 30px of type in a 44px target */
  text-decoration: none;
}
.contents a:hover .toc-title { text-decoration: underline; }
.contents .toc-n { text-align: right; }

.book-closing {
  font-family: var(--font-title), serif;
  font-size: clamp(3rem, 1rem + 10vw, 10.5rem);
  line-height: 1;
  margin: 0 0 3.75rem;
}
.colophon { max-width: 36rem; }
.colophon,
.shelf-note {
  font-size: 0.875rem;
  line-height: 1.5rem;
}
.colophon p { margin: 0 0 1.5rem; }
.colophon a { overflow-wrap: anywhere; }

/* ---- The shelf: every book on the site, standing on shelf boards ----
   One flex row that wraps. Each book carries its own piece of board, and
   the pieces meet edge to edge, so a shelf appears under every row however
   many books fit across. The empty last item takes whatever is left of the
   last row, so that board runs to the wall too.

   A board is a plank seen from a little above: a thin lighter strip, the
   top the books stand on, over a thick dark front face. Dark brown on the
   light ground; in dark mode two lighter browns, since no brown dark enough
   to be called dark shows against brown-9. */
.site-title {
  font-size: clamp(3rem, 1rem + 11vw, 12rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin: 0;
  padding: clamp(1.5rem, 6vw, 6rem) clamp(1.5rem, 6vw, 6rem) 0;
}
.shelf {
  --inch: clamp(1.5rem, 1rem + 2.2vw, 2.5rem);   /* one inch of a real page */
  --board: clamp(1.125rem, 0.75rem + 1.5vw, 1.875rem);
  --board-face: light-dark(var(--wjerk-brown), var(--brown-5));
  --board-top: light-dark(var(--brown-5), var(--brown-3));
  list-style: none; margin: 0; padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
}
.shelf li {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: clamp(3rem, 8vw, 6rem);
  border-bottom: var(--board) solid var(--board-face);
}
.shelf li::after {
  content: "";
  align-self: stretch;
  height: calc(var(--board) * 0.3);
  background: var(--board-top);
}
.shelf .rest { flex: 999 0 0; }

/* A cover is the book's own page, to scale: its width and height in
   inches, its title and author in its own typefaces, on a pale kit tint.
   It keeps its paper and ink in dark mode, as an object would. */
.cover {
  width: calc(var(--w) * var(--inch));
  margin-inline: calc(var(--inch) * 0.5);
  aspect-ratio: var(--w) / var(--h);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(var(--inch) * 0.5) calc(var(--inch) * 0.45);
  background: var(--cover);
  color: var(--wjerk-black);
  border: 2px solid var(--wjerk-black);
  border-bottom: 0;
  text-decoration: none;
  hyphens: auto;
  overflow-wrap: break-word;
}
.cover:hover,
.cover:active { background: var(--wjerk-black); color: var(--cover); }
.cover-title {
  font-family: var(--font-title), var(--font-sans);
  font-size: max(0.8125rem, calc(var(--w) * var(--inch) * 0.11));   /* a share of the cover's width */
  line-height: 1.05;
}
.cover-author {
  font-family: var(--font-head), var(--font-mono);
  font-weight: var(--head-weight);
  font-size: max(0.75rem, calc(var(--inch) * 0.2));
  line-height: 1.35;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}