/* Suspect the Ruler — one stylesheet, no scripts, no webfonts.
   The only ornament is a ruler: ticks instead of a horizontal rule. */

:root {
  --ink:        #1a1917;
  --ink-soft:   #55504a;
  --ink-faint:  #8c857c;
  --paper:      #f7f4ee;
  --line:       #d8d1c4;
  --mark:       #9a2f22;   /* the pencil mark: links, ticks */
  --measure:    34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #e6e1d8;
    --ink-soft:  #a9a29a;
    --ink-faint: #76706a;
    --paper:     #15161a;
    --line:      #2f3238;
    --mark:      #e08a6a;
  }
}

html { font-size: 17px; -webkit-text-size-adjust: 100%; }
@media (min-width: 40em) { html { font-size: 18px; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua",
               Georgia, "Times New Roman", serif;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
}

.wrap { max-width: var(--measure); margin: 0 auto; padding: 2.4rem 1.3rem 5rem; }

/* ---- the ruler ---- */
.ruler {
  height: 11px;
  border: 0;
  margin: 2.6rem 0;
  background:
    repeating-linear-gradient(to right,
      var(--line) 0 1px, transparent 1px 8px);
  border-bottom: 1px solid var(--line);
  opacity: .9;
}
.ruler--major {
  background:
    repeating-linear-gradient(to right,
      var(--mark) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(to right,
      var(--line) 0 1px, transparent 1px 8px);
}

/* ---- masthead ---- */
.mast { margin: 0 0 .2rem; }
.mast a { color: var(--ink); text-decoration: none; border: 0; }
.mast h1 {
  font-size: 1.42rem;
  letter-spacing: .055em;
  text-transform: uppercase;
  font-weight: 600;
  margin: 0;
}
.mast p {
  margin: .5rem 0 0;
  color: var(--ink-soft);
  font-size: .92rem;
  font-style: italic;
}
nav.top { margin-top: 1.1rem; font-size: .86rem; letter-spacing: .03em; }
nav.top a { margin-right: 1.1rem; }

/* ---- links ---- */
a { color: var(--mark); text-decoration: none; border-bottom: 1px solid currentColor; }
a:hover { background: var(--mark); color: var(--paper); border-color: var(--mark); }

/* ---- the index list ---- */
ol.pieces { list-style: none; margin: 0; padding: 0; }
ol.pieces li { margin: 0 0 1.75rem; }
ol.pieces .t {
  display: block;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.3;
  border: 0;
}
ol.pieces .t:hover { background: none; color: var(--mark); }
ol.pieces .d { display: block; color: var(--ink-soft); font-size: .95rem; margin-top: .22rem; }
ol.pieces .m {
  display: block;
  margin-top: .3rem;
  font-size: .76rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.startlist { border-left: 2px solid var(--mark); padding-left: 1.1rem; margin: 0 0 1rem; }
.startlist h2 { font-size: .78rem; letter-spacing: .12em; text-transform: uppercase;
                color: var(--ink-faint); margin: 0 0 .7rem; font-weight: 600; }

/* ---- an essay ---- */
article h1 {
  font-size: 1.74rem;
  line-height: 1.2;
  margin: 0 0 .55rem;
  font-weight: 600;
  letter-spacing: -.005em;
}
article .byline { color: var(--ink-soft); font-size: .93rem; font-style: italic; margin: 0 0 2rem; }
article h2 {
  font-size: .8rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
  margin: 2.6rem 0 .6rem;
}
article h3 { font-size: 1.04rem; margin: 2rem 0 .4rem; }
article p { margin: 0 0 1.15rem; }
article blockquote {
  margin: 1.5rem 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--line);
  color: var(--ink-soft);
}
article ul, article ol { padding-left: 1.3rem; }
article li { margin-bottom: .45rem; }
article em { font-style: italic; }
article strong { font-weight: 600; }
code, pre, .path {
  font-family: "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  font-size: .86em;
}
code { background: rgba(128,120,105,.13); padding: .08em .3em; border-radius: 2px; }
pre {
  background: rgba(128,120,105,.1);
  padding: .9rem 1rem;
  overflow-x: auto;
  border-left: 2px solid var(--line);
  line-height: 1.45;
}
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; margin: 1.4rem 0; }
th, td { text-align: left; padding: .38rem .6rem .38rem 0; border-bottom: 1px solid var(--line); }
th { font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-faint); font-weight: 600; }
td { font-variant-numeric: tabular-nums; }
sup a { border: 0; }
.footnote { font-size: .88rem; color: var(--ink-soft); }
.footnote hr { display: none; }

/* ---- foot ---- */
footer { margin-top: 3rem; font-size: .84rem; color: var(--ink-faint); }
footer a { color: var(--ink-soft); }
.prevnext { display: flex; justify-content: space-between; gap: 1.5rem; font-size: .9rem; margin-top: 2rem; }

/* ---- math ----
   A display equation wider than the column was being clipped, not wrapped:
   the Domb numbers ran off the right edge of the first page I looked at. */
.katex-display { overflow-x: auto; overflow-y: hidden; padding: .25rem 0 .5rem; }
.katex { font-size: 1.03em; }
article p .katex { max-width: 100%; }
.wrap.mathpage { --measure: 41rem; }