/* Colours: dark only. */
:root {
  color-scheme: dark;
  --bg:      #0f121a;
  --ink:     #e7eaf3;
  --muted:   #8a93aa;
  --faint:   #252b3a;  /* table rules */
  --code-bg: #181d29;
  --accent:  #6f97ff;  /* resume blue: links, marks, quote bar */
  --mark: #ffd60a;
  --mark-ink: #0f121a;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
}

/* Body font: Atkinson Hyperlegible Next, served from this site (OFL licence next to the files).
   One file per style, every weight from 200 to 800. Latin only: Greek, arrows and emoji use the system font. */
@font-face { font-family: "Atkinson Hyperlegible Next"; font-style: normal; font-weight: 200 800; font-display: swap; src: url("atkinson-hyperlegible-next-latin-normal.woff2") format("woff2"); }
@font-face { font-family: "Atkinson Hyperlegible Next"; font-style: italic; font-weight: 200 800; font-display: swap; src: url("atkinson-hyperlegible-next-latin-italic.woff2") format("woff2"); }

/* Page */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  max-width: 45em;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--ink);
  font-family: "Atkinson Hyperlegible Next", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", sans-serif;
  font-size: 1.125rem;
  line-height: 1.65;
}

/* Text */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
h2, h3, h4 { scroll-margin-top: 1rem; } /* a jump to a section leaves some air above it */
h1 { font-size: 1.55rem; margin: 0 0 0.4rem; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 0.6rem; }
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.5rem; }
p, ul, ol, blockquote, pre, figure, table { margin: 0 0 1em; }
strong { font-weight: 650; }
mark { background: var(--mark); color: var(--mark-ink); padding: 0 0.15em; }
::selection { background: color-mix(in srgb, var(--mark) 99%, transparent); color: var(--mark-ink); } /* 99%: WebKit dims a fully opaque selection colour */
a { color: var(--accent); text-decoration-thickness: 0.12em; text-underline-offset: 0.18em; }
a:hover { background: var(--mark); color: var(--mark-ink); text-decoration: none; }
blockquote { margin-left: 0; padding-left: 1em; border-left: 3px solid var(--accent); color: var(--muted); }
img, video { display: block; max-width: 100%; height: auto; margin: 0 auto; border-radius: 6px; }
figure { text-align: center; }
figcaption { margin-top: 0.5rem; font-size: 0.88rem; color: var(--muted); }
hr { border: 0; margin: 2.5rem 0; text-align: center; }
hr::after { content: "* * *"; color: var(--muted); }
table { border-collapse: collapse; font-size: 0.95rem; }
th, td { padding: 0.35em 0.8em; border-bottom: 1px solid var(--faint); text-align: left; }
th { font-size: 0.9em; }

/* Code. Zola (Giallo) colours the tokens inline; only the box is set here. */
code { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
pre { padding: 1em 1.1em; overflow-x: auto; border-radius: 8px; line-height: 1.5; background: var(--code-bg) !important; }
pre span { text-decoration: none !important; } /* the GitHub themes underline parameters */
.giallo-l { display: inline-block; min-height: 1lh; width: 100%; } /* one code line */
.giallo-ln { display: inline-block; user-select: none; margin-right: 0.4em; padding: 0.4em; min-width: 3ch; text-align: right; opacity: 0.8; } /* its line number */

/* Math (KaTeX loads after this file, hence "article") */
.katex-display { overflow-x: auto; overflow-y: hidden; }
article .katex { font-size: 1.09em; }

/* Masthead: /home/polybulle on the left, links on the right */
#mast { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 3.5rem; font-size: 0.95rem; }
#mast a { text-decoration: none; }
#mast .name { font-family: var(--mono); font-size: 1.6rem; color: var(--ink); background: none; }
#mast .name::before { content: "/home/"; color: var(--accent); }
#mast nav a { margin-left: 1.4em; color: var(--muted); }
#mast nav a:hover { color: var(--mark-ink); } /* beats the rule above: dark ink on the yellow box */

/* Post list */
.index { list-style: none; padding: 0; }
.index li { margin-bottom: 1.6rem; }
.index time { display: block; font-size: 0.8rem; color: var(--muted); }
.index a { font-size: 1.2rem; font-weight: 600; text-decoration: none; }
.index p { margin: 0.15rem 0 0; }
.index p, .index .empty { color: var(--muted); }

/* Post: byline, and the "#" link that hangs left of each section title */
.meta { margin: 0 0 2.2rem; font-size: 0.82rem; color: var(--muted); }
.zola-anchor { position: absolute; transform: translateX(calc(-100% - 0.6rem)); font-weight: 400; text-decoration: none; }
@media (width < 44em) { /* narrow window: no left margin to hang in, so the "#" sits inline */
  .zola-anchor { position: static; transform: none; margin-right: 0.6rem; }
}

/* Footnotes. Without JavaScript (and in reader mode): Zola's list at the bottom of the post.
   With notes.js: the list is hidden and each note is copied into an <aside class="sidenote">
   right after its reference. Narrow window: a popover. Wide window: a note in the right margin.
   notes.js tells the two apart by `position: absolute`, so keep that on the popover only. */
.footnote-reference { line-height: 0; }
.footnote-reference a { padding: 0 0.15em; border-radius: 3px; font-size: 0.72em; font-weight: 700; text-decoration: none; }
.footnotes { font-size: 0.9rem; }
.footnotes ol { padding-left: 1.4em; }
.footnotes li:target { background: var(--code-bg); }
.sn .footnotes, .sn hr:has(+ .footnotes) { display: none; }

article { position: relative; }
.sidenote { font-size: 1rem; line-height: 1.5; }
.sidenote p { display: inline; margin: 0 0 0.5em; }
.sidenote p + p { display: block; margin-top: 0.5em; }
.sn-n { margin-right: 0.5em; font-size: 1rem; font-weight: 700; color: var(--accent); }

@media (width < 72em) {
  .sidenote {
    display: none;
    position: absolute; /* notes.js sets top and left */
    z-index: 10;
    width: max-content;
    max-width: min(100%, 24rem);
    max-height: 50vh;
    overflow-y: auto;
    padding: 0.6em 0.85em;
    background: var(--bg);
    border: 2px solid var(--accent);
    border-radius: 4px;
    box-shadow: 2px 2px 0 var(--accent);
  }
  .sidenote.open { display: block; }
}
@media (width >= 72em) {
  body { max-width: 58em; }
  #mast { max-width: 36em; }
  article > *, .index { max-width: 45em; }
  .sidenote { float: right; clear: right; width: 16rem; margin: 0.3em -18.5rem 0.8em 0; color: var(--muted); } /* -(width + gap): out of the text, into the margin */
  .sidenote.flash { animation: flash 1.2s ease-out; } /* clicking a reference flashes its note */
}
@keyframes flash { from { background: var(--mark); color: var(--mark-ink); } }