:root {
  color-scheme: light;
  --bg: #f4f0e8;
  --fg: #1a1612;
  --muted: #736a61;
  --line: rgb(0 0 0 / 0.1);
  --accent: #d9531a;
  /* The home backdrop's colours, faintest first. */
  --shade-1: #f2e3d7;
  --shade-2: #e9b196;
  --shade-3: #d9531a;
  --shade-4: #8d3611;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --gutter: clamp(16px, 4vw, 56px);
  --band: 34svh;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100svh;
  background: var(--bg);
  color: var(--fg);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; border-radius: 2px; }
::selection { background: var(--accent); color: var(--bg); }

/* Header */

site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px var(--gutter);
}

.wordmark {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  white-space: nowrap;
}

.social {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.social a { display: block; color: var(--muted); transition: color 0.2s; }
.social a:hover { color: var(--accent); }
.social svg { display: block; width: 17px; height: 17px; fill: currentColor; }

@media (max-width: 720px) {
  site-header { padding-top: 20px; }
  .wordmark { font-size: 12px; letter-spacing: 0.22em; }
  .social { gap: 16px; }
}

/* Home: a band of contours across the top, posts centred below. */

.backdrop {
  position: absolute;
  inset: 0 0 auto;
  display: block;
  width: 100%;
  height: var(--band);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--accent) 30%, transparent);
  /* Shown only if WebGL is unavailable. */
  background: radial-gradient(120% 90% at 85% 10%, var(--shade-2), var(--shade-1) 40%, var(--bg) 75%);
}

.home {
  max-width: 640px;
  margin: 0 auto;
  padding: calc(var(--band) + 48px) var(--gutter) 96px;
}

.label {
  margin: 0 0 14px;
  color: var(--muted);
  font: 500 11px/1 var(--sans);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.posts {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.posts:not(:has(li))::before {
  content: "Nothing here yet.";
  display: block;
  padding: 12px 0;
  color: var(--muted);
  font-size: 14px;
}

.posts a {
  display: grid;
  grid-template-columns: 6rem 1fr auto;
  gap: 16px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.posts time { font: 11px var(--mono); color: var(--muted); }
.posts .title { font-size: 14px; line-height: 1.45; transition: color 0.2s; }
.posts a::after { content: "→"; color: var(--muted); transition: color 0.2s, translate 0.2s; }
.posts a:hover .title,
.posts a:hover::after { color: var(--accent); }
.posts a:hover::after { translate: 4px 0; }

@media (max-width: 520px) {
  .posts a { grid-template-columns: 1fr auto; row-gap: 4px; }
  .posts time { grid-column: 1 / -1; }
}

/* Post pages */

.page-body {
  background:
    radial-gradient(1100px 520px at 90% -10%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 70%),
    var(--bg);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 180px var(--gutter) 120px;
}

.page-title {
  margin: 0 0 56px;
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.back {
  display: inline-block;
  margin-bottom: 40px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}

.back:hover { color: var(--accent); }

.post-date { display: block; margin: -40px 0 56px; font: 12px var(--mono); color: var(--muted); }

.prose { font-size: 17px; line-height: 1.75; }
.prose p, .prose li { color: color-mix(in srgb, var(--fg) 85%, var(--bg)); }
.prose h2 { margin: 56px 0 12px; font-size: 26px; font-weight: 400; letter-spacing: -0.01em; }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose img { max-width: 100%; }
.prose code { font: 0.88em var(--mono); }
.prose pre { overflow-x: auto; padding: 16px 20px; border: 1px solid var(--line); border-radius: 8px; background: color-mix(in srgb, var(--fg) 4%, var(--bg)); }
.prose blockquote { margin: 28px 0; padding-left: 20px; border-left: 2px solid var(--accent); color: var(--muted); }
.prose figure { margin: 40px 0; }
.prose figcaption { margin-top: 12px; color: var(--muted); font-size: 14px; }
.prose .katex { font-size: 1.1em; }
.prose .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

/* Code highlighting (highlight.js), coloured from the palette. */
.hljs-keyword, .hljs-built_in, .hljs-literal, .hljs-meta { color: var(--accent); }
.hljs-string, .hljs-number, .hljs-symbol { color: var(--shade-4); }
.hljs-title, .hljs-title.function_, .hljs-title.class_ { color: var(--fg); font-weight: 500; }
.hljs-comment, .hljs-doctag, .hljs-quote { color: var(--muted); font-style: italic; }
.hljs-params, .hljs-attr, .hljs-variable { color: color-mix(in srgb, var(--fg) 75%, var(--accent)); }