/* ─────────────────────────────────────────────────────────────────────────
   Nine Small Applications — a catalogue set as a book.
   Paper ground, hairline rules, one spot colour. No boxes, no shadows.
   ───────────────────────────────────────────────────────────────────────── */

:root {
  --paper:      #f8f5ee;
  --paper-deep: #f1ebdf;
  --ink:        #1b1a17;
  --ink-2:      #55504a;
  --ink-3:      #8d8577;
  --rule:       #d9d1c1;
  --rule-soft:  #e6dfd1;
  --accent:     #8f3a29;

  --serif:   "EB Garamond", Iowan Old Style, Palatino, Georgia, serif;
  --display: "Cormorant Garamond", "EB Garamond", Palatino, Georgia, serif;
  --mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 33rem;   /* the text column */
  --margin-col: 12rem; /* the marginal column beside it */
}

:root[data-theme="night"],
html:not([data-theme="paper"]) {
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="paper"]) {
    --paper:      #16151a;
    --paper-deep: #1d1c22;
    --ink:        #e6e0d4;
    --ink-2:      #aaa398;
    --ink-3:      #7d766c;
    --rule:       #333139;
    --rule-soft:  #26252b;
    --accent:     #cd7a63;
    color-scheme: dark;
  }
}

:root[data-theme="night"] {
  --paper:      #16151a;
  --paper-deep: #1d1c22;
  --ink:        #e6e0d4;
  --ink-2:      #aaa398;
  --ink-3:      #7d766c;
  --rule:       #333139;
  --rule-soft:  #26252b;
  --accent:     #cd7a63;
  color-scheme: dark;
}

/* ── base ──────────────────────────────────────────────────────────────── */

* { box-sizing: border-box; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}
@media (min-width: 64rem) { html { font-size: 18px; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.06rem;
  line-height: 1.62;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

p { margin: 0 0 1.05em; }
a { color: inherit; }

::selection { background: var(--accent); color: var(--paper); }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--paper); color: var(--ink);
  padding: .6rem 1rem; font-family: var(--mono); font-size: .72rem; z-index: 10;
}
.skip:focus { left: 0; }

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

/* small caps, used sparingly */
.sc {
  font-variant: small-caps;
  letter-spacing: .04em;
}

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2rem auto;
}
.rule--short { width: 3.5rem; }

.ornament {
  text-align: center;
  color: var(--ink-3);
  font-size: 1.15rem;
  letter-spacing: .3em;
  margin: 5.5rem 0;
  user-select: none;
}

/* ── running head ──────────────────────────────────────────────────────── */

.runner {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  height: 2.9rem;
  padding: 0 1.4rem;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(120%) blur(8px);
  -webkit-backdrop-filter: saturate(120%) blur(8px);
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--mono);
  font-size: .63rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-3);
  opacity: 0;
  transition: opacity .4s ease;
}
.runner { pointer-events: none; }
.runner.is-visible { opacity: 1; pointer-events: auto; }

.runner__book { white-space: nowrap; }
.runner__chapter {
  flex: 1;
  min-width: 0;
  text-align: center;
  color: var(--ink-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.runner__right { display: flex; align-items: center; gap: 1.1rem; }
.runner__folio { min-width: 2.5ch; text-align: right; }

.runner__toggle {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  padding: .15rem 0;
  font: inherit;
  color: var(--ink-3);
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease;
}
.runner__toggle:hover { color: var(--accent); border-bottom-color: var(--accent); }

@media (max-width: 40rem) {
  .runner__book { display: none; }
  .runner__chapter { text-align: left; }
}

/* ── title page ────────────────────────────────────────────────────────── */

.cover {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 9rem;
  position: relative;
}

.cover__above {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}

.cover__title {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(3.2rem, 11vw, 7rem);
  line-height: .96;
  letter-spacing: -0.012em;
  margin: .1em 0 .34em;
}

.cover__sub {
  font-style: italic;
  font-size: clamp(1rem, 2.4vw, 1.22rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 30rem;
  margin: 0 auto;
}

.cover__author {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  margin: 0 0 .5rem;
}

.cover__home,
.colophon__home {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease, color .18s ease;
}
.cover__home:hover,
.colophon__home:hover { color: var(--accent); border-bottom-color: var(--accent); }

.colophon__home {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
}

.cover__imprint {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}

.cover__cue {
  position: absolute;
  bottom: 2.4rem;
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
  padding-bottom: 1.6rem;
}
.cover__cue::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0;
  width: 1px; height: 1.1rem;
  background: var(--rule);
}
.cover__cue:hover { color: var(--accent); }

/* ── generic page block ────────────────────────────────────────────────── */

.page {
  max-width: calc(var(--margin-col) + var(--measure) + 3.5rem);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.head {
  font-family: var(--mono);
  font-weight: 400;
  font-size: .7rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 2.2rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--rule);
}
.head--small { border: 0; padding-bottom: 0; margin-bottom: 1.4rem; }
.head__note {
  font-family: var(--mono);
  font-size: .66rem;
  color: var(--ink-3);
  margin: -1.6rem 0 2.2rem;
}

.prose { max-width: var(--measure); }
.prose .lede {
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--ink);
}
.prose p + p { text-indent: 1.4em; }

/* ── contents: the works three across, as a list of plates ───────────── */

.toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 2.5rem;
}
@media (min-width: 46rem) { .toc { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 66rem) { .toc { grid-template-columns: repeat(3, 1fr); } }

.toc li { margin: 0; }

.toc a {
  display: block;
  padding: .85rem 0 1.05rem;
  text-decoration: none;
  border-top: 1px solid var(--rule-soft);
  transition: border-color .18s ease;
}
.toc a:hover { border-top-color: var(--accent); }
.toc a:hover .toc__title { color: var(--accent); }

.toc__line {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  margin-bottom: .3rem;
}
.toc__numeral {
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .12em;
  color: var(--ink-3);
}
.toc__leader {
  flex: 1;
  border-bottom: 1px dotted var(--rule);
  transform: translateY(-.25em);
  min-width: 1rem;
}
.toc__folio {
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--ink-3);
}
.toc__title {
  display: block;
  font-size: 1.16rem;
  line-height: 1.2;
  transition: color .18s ease;
}
.toc__sub {
  display: block;
  font-style: italic;
  font-size: .9rem;
  color: var(--ink-3);
  line-height: 1.35;
  margin-top: .12rem;
}

/* ── an entry ──────────────────────────────────────────────────────────── */

.entry {
  max-width: calc(var(--margin-col) + var(--measure) + 3.5rem);
  margin: 0 auto;
  padding: 0 1.5rem;
  scroll-margin-top: 4.5rem;
}
.entry + .entry { margin-top: 7.5rem; }

.entry__grid {
  display: grid;
  gap: 2.4rem 3.5rem;
  grid-template-columns: 1fr;
}
/* Front and back matter sit on the same text block as the entries, so the
   whole book has one measure and one left edge. */
@media (min-width: 60rem) {
  .page { padding-left: calc(var(--margin-col) + 3.5rem + 1.5rem); }
  /* the index runs the full width of the block, as an index should */
  #contents, #index { padding-left: 1.5rem; }
}

@media (min-width: 60rem) {
  .entry__grid {
    grid-template-columns: var(--margin-col) minmax(0, var(--measure));
  }
  .entry__margin { text-align: right; }
}

/* marginal column */
.entry__margin {
  font-family: var(--mono);
  font-size: .66rem;
  line-height: 1.75;
  color: var(--ink-3);
  letter-spacing: .06em;
}
.entry__numeral {
  display: block;
  font-family: var(--display);
  font-size: 2.6rem;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ink);
  margin-bottom: .5rem;
}
.entry__date {
  display: block;
  text-transform: uppercase;
  letter-spacing: .14em;
  margin-bottom: 1.5rem;
}
.margin__label {
  display: block;
  text-transform: uppercase;
  letter-spacing: .2em;
  color: var(--ink-3);
  border-top: 1px solid var(--rule-soft);
  padding-top: .55rem;
  margin: 1.4rem 0 .5rem;
  font-size: .58rem;
}
.margin__list { list-style: none; margin: 0; padding: 0; }
.margin__list li { color: var(--ink-2); }

@media (max-width: 59.99rem) {
  .entry__margin {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: .2rem 1rem;
    border-bottom: 1px solid var(--rule-soft);
    padding-bottom: 1rem;
  }
  .entry__numeral { font-size: 1.6rem; margin: 0; }
  .entry__date { margin: 0; }
  .entry__margin .margin__label,
  .entry__margin .margin__list { display: none; }
}

/* body column */
.entry__body { max-width: var(--measure); }

.entry__title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2.1rem, 5.5vw, 3rem);
  line-height: 1.06;
  letter-spacing: -0.008em;
  margin: -.35rem 0 .35rem;
}
.entry__subtitle {
  font-style: italic;
  font-size: 1.1rem;
  color: var(--ink-2);
  margin: 0 0 1.8rem;
}

.entry__text p:first-of-type::first-letter {
  float: left;
  font-family: var(--display);
  font-weight: 400;
  font-size: 3.7em;
  line-height: .82;
  padding: .04em .09em 0 0;
  color: var(--accent);
}
.entry__text p + p { text-indent: 1.4em; }

/* notes */
.notes {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 1.3rem 0 0;
  border-top: 1px solid var(--rule-soft);
}
.notes li {
  position: relative;
  padding-left: 1.4rem;
  font-size: .97rem;
  color: var(--ink-2);
  margin-bottom: .42em;
}
.notes li::before {
  content: "\2014";           /* em dash, as a book would */
  position: absolute;
  left: 0;
  color: var(--ink-3);
}

/* imprint: where it lives, how to run it */
.imprint {
  margin-top: 1.9rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--mono);
  font-size: .68rem;
  line-height: 1.9;
  color: var(--ink-3);
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0 1rem;
}
.imprint dt {
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .58rem;
  padding-top: .32em;
}
.imprint dd { margin: 0; color: var(--ink-2); word-break: break-word; }

.imprint__link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease;
}
.imprint__link:hover { border-bottom-color: var(--accent); }
.imprint__link::after {
  content: "\2197";              /* north-east arrow, set small and quiet */
  font-size: .85em;
  margin-left: .35em;
  color: var(--ink-3);
}

/* materials, shown inline on narrow screens where the margin collapses */
.entry__materials-inline {
  display: none;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .06em;
  color: var(--ink-3);
  margin: 0 0 1.6rem;
}
@media (max-width: 59.99rem) {
  .entry__materials-inline { display: block; }
}

/* ── back index ────────────────────────────────────────────────────────── */

.backindex {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 2;
  column-gap: 3.5rem;
}
@media (max-width: 40rem) { .backindex { columns: 1; } }

.backindex li {
  break-inside: avoid;
  display: flex;
  align-items: baseline;
  gap: .5rem;
  font-size: .98rem;
  padding: .28rem 0;
}
.backindex__term { color: var(--ink); }
.backindex__leader {
  flex: 1;
  border-bottom: 1px dotted var(--rule);
  transform: translateY(-.3em);
  min-width: 1rem;
}
.backindex__refs {
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--ink-3);
  letter-spacing: .08em;
}
.backindex a { text-decoration: none; }
.backindex a:hover { color: var(--accent); }

/* ── colophon ──────────────────────────────────────────────────────────── */

.colophon {
  margin: 6rem auto 0;
  padding-bottom: 6rem;
  text-align: center;
  color: var(--ink-2);
  font-size: .97rem;
}
.colophon p { margin-bottom: .9em; }
.colophon__end {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .3em;
  color: var(--ink-3);
  margin-top: 2.4rem;
}

/* ── motion & print ────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

@media print {
  :root { --paper: #fff; --ink: #000; --ink-2: #333; --ink-3: #666; --rule: #bbb; --rule-soft: #ddd; --accent: #000; }
  .runner, .cover__cue, .skip { display: none !important; }
  .cover { min-height: 60vh; page-break-after: always; }
  .entry { page-break-inside: avoid; }
  .entry + .entry { margin-top: 3rem; }
  .ornament { margin: 2rem 0; }
  a { text-decoration: none; }
}