/* Shared tokens and typography. Light-only by choice: black ink on white paper, one red. */
@font-face { font-family: Charter; src: url(fonts/charter_regular.woff2) format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: Charter; src: url(fonts/charter_bold.woff2) format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: Charter; src: url(fonts/charter_italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: Charter; src: url(fonts/charter_bold_italic.woff2) format("woff2"); font-weight: 700; font-style: italic; font-display: swap; }

:root {
  color-scheme: light;
  --paper: #ffffff;
  --panel: #fbfbfa;
  --ink: #1d1d1b;
  --ink-soft: #6f6f6b;
  --line: #e4e4e0;
  --accent: #d8331f;
  --link: #1d1d1b;
}

* { margin: 0; box-sizing: border-box; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Charter, "Bitstream Charter", Georgia, serif;
  font-size: 18px;
  line-height: 1.5;
  padding: 64px 20px 72px;
}
::selection { background: var(--accent); color: #fff; }

.page { max-width: 680px; margin: 0 auto; }

h1, h2, h3 { font-weight: 700; line-height: 1.2; letter-spacing: -0.005em; text-wrap: balance; }
h1 { font-size: 34px; margin: 0 0 6px; }
h2 { font-size: 22px; margin: 44px 0 12px; }
h3 { font-size: 18px; margin: 28px 0 8px; }

/* Paper-style section numbers via counters: the md carries none, reordering
   renumbers. Summary, Bibliography and Appendices stay unnumbered; h3s inside
   <details> (appendix internals) are never numbered. */
.page h2 { counter-increment: sec; counter-reset: subsec; }
.page h2::before { content: counter(sec); color: var(--ink-soft); font-weight: 400; margin-right: 0.75em; }
.page h3 { counter-increment: subsec; }
.page h3::before { content: counter(sec) "." counter(subsec); color: var(--ink-soft); font-weight: 400; margin-right: 0.75em; }
h2#summary, h2#bibliography, h2#appendices { counter-increment: none; }
h2#summary::before, h2#bibliography::before, h2#appendices::before { content: none; }
.page details h3 { counter-increment: none; }
.page details h3::before { content: none; }

p, ul, ol { margin: 0 0 18px; text-wrap: pretty; }
ul, ol { padding-left: 24px; }

a { color: var(--link); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
/* Posts carry many citations per paragraph: grey underlines there, ink on hover. */
.page:not(.home) a { text-decoration-color: #b9b9b4; }
.page:not(.home) a:hover { text-decoration-color: currentColor; }

.byline, .meta { font-size: 15px; color: var(--ink-soft); }

code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.86em; }
pre { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px; overflow-x: auto; margin: 0 0 18px; }

hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0; }

.page { counter-reset: fig tbl; }
figure { margin: 32px 0; counter-increment: fig; }
figcaption { font-size: 15px; color: var(--ink-soft); margin-top: 10px; line-height: 1.5; }
figcaption p { margin: 0 0 8px; display: inline; }
figcaption::before { content: "Figure " counter(fig) "."; font-weight: 700; color: var(--ink); margin-right: 0.5em; }
/* Elements with the .wide class break out of the text column on wide viewports. */
@media (min-width: 920px) {
  .page .wide { --figw: min(840px, calc(100vw - 64px)); width: var(--figw); margin-left: calc((680px - var(--figw)) / 2); }
  .page details .wide { width: 100%; margin-left: 0; }
}

/* Collapsed appendix blocks. */
details { margin: 32px 0; border: 1px solid var(--line); border-radius: 4px; padding: 0 18px; background: var(--panel); }
summary { font-size: 17px; font-weight: 700; color: var(--ink); padding: 14px 0; cursor: pointer; }
summary:hover { color: var(--accent); }
details[open] summary { border-bottom: 1px solid var(--line); }
details figure { margin: 20px 0 24px; }
details > p, details > table, details > dl, details > ul { margin: 14px 0; font-size: 15.5px; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; margin: 20px 0; counter-increment: tbl; }
table caption { caption-side: bottom; text-align: left; font-size: 15.5px; color: var(--ink); line-height: 1.5; max-width: 70ch; margin: 18px auto 0; padding: 16px 0 0; border-top: 1px solid var(--line); }
table caption::before { content: "Table " counter(tbl) "."; font-weight: 700; color: var(--ink); margin-right: 0.5em; }
th { font-size: 14px; font-weight: 700; color: var(--ink); text-align: left; padding: 6px 18px 8px 0; white-space: nowrap; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); }
td { padding: 7px 16px 7px 0; vertical-align: top; font-variant-numeric: tabular-nums; }
tbody tr:last-child td { border-bottom: 2px solid var(--ink); }
/* A table presented as a figure: panel card, inset caption. */
.tbl { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 22px; margin: 32px 0; overflow-x: auto; }
.tbl table { width: auto; margin: 0 auto; }
.tbl td { white-space: nowrap; }
th:last-child, td:last-child { padding-right: 0; }
details dl { display: grid; grid-template-columns: minmax(140px, max-content) 1fr; gap: 8px 24px; font-size: 15px; }
details dt { color: var(--ink-soft); }
details dd { margin: 0; }
details dd p, details td p { margin: 0; }

blockquote { border-left: 3px solid var(--line); padding-left: 16px; color: var(--ink-soft); margin: 0 0 18px; }

.post-list { list-style: none; padding: 0; }
.post-list li { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; padding: 8px 0; border-bottom: 1px solid var(--line); }
.post-list time { font-size: 15px; color: var(--ink-soft); white-space: nowrap; }

footer { margin-top: 64px; font-size: 15px; color: var(--ink-soft); }

/* Landing page. */
.page.home { max-width: 600px; }
.page.home h2 { counter-increment: none; font-size: 18px; margin: 52px 0 14px; }
.page.home h2::before { content: none; }
.masthead { text-align: center; margin-bottom: 44px; }
.masthead .portrait { display: block; width: 140px; height: 140px; object-fit: cover; margin: 0 auto; }
.masthead h1 { margin: 18px 0 0; }
.links { display: flex; justify-content: center; gap: 18px; margin: 14px 0 0; }
.links a { display: inline-flex; color: var(--ink); text-decoration: none; }
.links a:hover { color: var(--accent); }
.links svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2.1; stroke-linecap: round; stroke-linejoin: round; }
ol.n { list-style: none; padding: 0; margin: 0; counter-reset: n; }
ol.n li { position: relative; padding-left: 34px; margin: 0 0 18px; }
ol.n li::before { counter-increment: n; content: counter(n); position: absolute; left: 0; top: 0; font-weight: 700; }
ol.n .t { display: block; }
ol.n .au { display: block; font-size: 16px; }
ol.n .v, ol.n .date { display: block; font-size: 16px; color: var(--ink-soft); }
.note { font-size: 15px; color: var(--ink-soft); margin: 4px 0 0 34px; }
.colophon { text-align: center; margin-top: 80px; }
.colophon .mark { display: block; width: 24px; height: 24px; margin: 0 auto 10px; }

/* Figure fragments ask for Source Serif 4; serve Charter under that name so captions match the body. */
@font-face { font-family: "Source Serif 4"; src: url(fonts/charter_regular.woff2) format("woff2"); font-weight: 400; font-style: normal; }
@font-face { font-family: "Source Serif 4"; src: url(fonts/charter_bold.woff2) format("woff2"); font-weight: 600 700; font-style: normal; }
@font-face { font-family: "Source Serif 4"; src: url(fonts/charter_italic.woff2) format("woff2"); font-weight: 400; font-style: italic; }