/* hfh.pw — cool white, Inter, one cobalt accent. */
:root {
  --bg: #ffffff;
  --ink: #0f1115;
  --ink-2: #2e333c;
  --muted: #5d6470;
  --line: #e6e8ec;
  --wash: #f4f5f7;
  --accent: #1f3fe0;
  --accent-wash: rgba(31, 63, 224, .08);
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --bar-h: 56px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d11;
    --ink: #e9ebef;
    --ink-2: #c5cad3;
    --muted: #8b93a1;
    --line: #1f242c;
    --wash: #13161c;
    --accent: #8ea2ff;
    --accent-wash: rgba(142, 162, 255, .12);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--bar-h) + 64px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: .22em;
}
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.ext { font-size: .82em; margin-left: .18em; color: var(--muted); }
a:hover .ext { color: var(--accent); }

.skip-link {
  position: absolute; left: -9999px; top: 8px; z-index: 50;
  background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 6px; text-decoration: none;
}
.skip-link:focus { left: 12px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* ------------------------------------------------ header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  height: var(--bar-h); display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.wordmark {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 650; font-size: 16px; letter-spacing: -.01em; text-decoration: none; white-space: nowrap;
}
.wordmark:hover { color: var(--ink); }
.mark { width: 12px; height: 12px; background: var(--accent); border-radius: 2px; flex-shrink: 0; }
.site-header nav { display: flex; gap: 22px; }
.site-header nav a { font-size: 14.5px; color: var(--muted); text-decoration: none; white-space: nowrap; }
.site-header nav a:hover { color: var(--ink); }

/* ------------------------------------------------ home */
.intro { padding: 88px 0 24px; }
.intro h1 {
  font-size: clamp(42px, 7vw, 64px); line-height: 1; letter-spacing: -.04em;
  font-weight: 700; margin: 0 0 22px;
}
.bio { font-size: 19px; line-height: 1.55; color: var(--ink-2); max-width: 38em; margin: 0; }
.bio a { text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent); }

section { padding-top: 56px; }
.label {
  font-size: 12.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 12px;
}

.selected, .projects {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: 1fr 1fr; column-gap: 32px;
}
.selected li, .projects li { padding: 14px 0 15px; border-top: 1px solid var(--line); }
.selected a, .projects a {
  font-weight: 600; font-size: 16.5px; letter-spacing: -.01em; line-height: 1.35; text-decoration: none;
}
.selected .note, .projects p {
  display: block; margin: 4px 0 0; font-size: 14.5px; line-height: 1.45; color: var(--muted);
}

.index-head {
  position: sticky; top: var(--bar-h); z-index: 10; background: var(--bg);
  display: flex; align-items: center; gap: 12px 20px; flex-wrap: wrap;
  padding: 14px 0 12px; border-bottom: 1px solid var(--ink);
}
.index-head .label { margin: 0 8px 0 0; }
.filters { display: flex; gap: 4px; flex: 1; }
.filter {
  font: inherit; font-size: 14px; color: var(--muted); background: none; border: 0;
  padding: 5px 9px; border-radius: 6px; cursor: pointer;
}
.filter span { font-size: 12px; opacity: .75; font-variant-numeric: tabular-nums; }
.filter:hover { color: var(--ink); }
.filter.active { color: var(--ink); background: var(--wash); }
#search {
  font: inherit; font-size: 14px; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 6px; padding: 7px 10px; width: 190px;
}
#search::placeholder { color: var(--muted); }
#search:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }

.index { list-style: none; margin: 0; padding: 0; }
.year {
  font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--ink);
  padding: 30px 0 8px; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums;
}
.row {
  display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 18px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--line);
}
.row[hidden], .year[hidden] { display: none; }
.row time { font-size: 13.5px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.row a { font-size: 16.5px; line-height: 1.4; text-decoration: none; }
.row a:hover { color: var(--accent); }
.tags { display: flex; gap: 12px; }
.tag { font-size: 12.5px; color: var(--muted); white-space: nowrap; }
.empty { color: var(--muted); padding: 24px 0; }

/* ------------------------------------------------ footer */
.site-footer { margin-top: 88px; border-top: 1px solid var(--line); }
.site-footer .wrap { padding-top: 26px; padding-bottom: 56px; }
.site-footer p { margin: 0 0 6px; font-size: 14px; color: var(--muted); }

/* ------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font: 500 14px/1 var(--sans); padding: 9px 13px; border-radius: 7px;
  color: var(--ink); background: var(--bg); border: 1px solid var(--line); text-decoration: none;
}
.btn:hover { color: var(--ink); border-color: var(--ink); }
.btn.primary { color: var(--bg); background: var(--ink); border-color: var(--ink); }
.btn.primary:hover { color: #fff; background: var(--accent); border-color: var(--accent); }

/* ------------------------------------------------ live doc page */
html:has(.doc-page) { height: 100%; }
.doc-page { height: 100vh; height: 100dvh; display: flex; flex-direction: column; overflow: hidden; }
.doc-bar {
  display: flex; align-items: center; gap: 18px; height: var(--bar-h); flex-shrink: 0;
  padding: 0 20px; border-bottom: 1px solid var(--line); background: var(--bg);
}
.doc-title {
  flex: 1; min-width: 0; margin: 0; font-size: 14.5px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--muted);
}
.doc-title strong { color: var(--ink); font-weight: 600; margin-right: 6px; }
.doc-actions { display: flex; gap: 8px; flex-shrink: 0; }
.doc-frame { flex: 1; width: 100%; border: 0; background: #fff; }

/* ------------------------------------------------ article */
.article { max-width: 736px; }
.article-head { padding: 76px 0 34px; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.article-head .meta {
  font-size: 13.5px; color: var(--muted); margin: 0 0 16px; font-variant-numeric: tabular-nums;
}
.article-head h1 {
  font-size: clamp(34px, 5.2vw, 52px); line-height: 1.06; letter-spacing: -.035em;
  font-weight: 700; margin: 0; text-wrap: balance;
}
.dek { font-size: 21px; line-height: 1.45; color: var(--ink-2); margin: 16px 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 0; }

.prose { font-size: 18px; line-height: 1.72; overflow-wrap: break-word; }
.prose > * { max-width: 680px; }
.prose p { margin: 0 0 1.15em; }
.prose h1, .prose h2 {
  font-size: 26px; line-height: 1.22; letter-spacing: -.022em; font-weight: 700; margin: 2.1em 0 .6em;
}
.prose h3 { font-size: 21px; line-height: 1.3; letter-spacing: -.015em; font-weight: 650; margin: 1.9em 0 .5em; }
.prose h4, .prose h5, .prose h6 { font-size: 18px; font-weight: 650; margin: 1.7em 0 .4em; }
.prose strong { font-weight: 650; }
.prose a { text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent); }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.15em; }
.prose li { margin: .3em 0; }
.prose li > h1, .prose li > h2, .prose li > h3 { display: inline; }
.prose .l1 { margin-left: 1.5em; } .prose .l2 { margin-left: 3em; } .prose .l3 { margin-left: 4.5em; }
.prose img { max-width: 100%; height: auto; border-radius: 4px; }
.prose table {
  display: block; overflow-x: auto; border-collapse: collapse; margin: 1.6em 0;
  font-size: 15px; line-height: 1.5; max-width: 100%;
}
.prose td { border: 1px solid var(--line); padding: 8px 11px; vertical-align: top; }
.prose td p { margin: 0; }
.prose sup { font-size: .7em; line-height: 0; }
.prose sup a { color: var(--accent); text-decoration: none; padding: 0 1px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }
.prose :target { background: var(--accent-wash); border-radius: 3px; }
.footnotes { margin-top: 64px; padding-top: 8px; border-top: 1px solid var(--line); font-size: 15px; line-height: 1.6; color: var(--ink-2); }
.footnotes h2 { font-size: 12.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 14px 0 12px; }
.footnotes p { margin: 0 0 .55em; }

/* ------------------------------------------------ 404 */
.notfound { padding: 96px 24px 24px; }
.notfound h1 { font-size: 44px; letter-spacing: -.035em; margin: 0 0 16px; }
.notfound p { color: var(--ink-2); font-size: 18px; }

/* ------------------------------------------------ small screens */
@media (max-width: 760px) {
  .bar { padding: 0 16px; gap: 16px; }
  .site-header nav { gap: 18px; min-width: 0; }
  .site-header nav a[rel~="me"], .site-header nav a[href$="#projects"] { display: none; }
  .wrap { padding: 0 16px; }
  .intro { padding-top: 56px; }
  .bio { font-size: 17.5px; }
  .selected, .projects { grid-template-columns: 1fr; }
  .index-head { gap: 10px; }
  .filters { order: 3; flex-basis: 100%; overflow-x: auto; margin: 0 -9px; }
  #search { width: auto; flex: 1; }
  .row { grid-template-columns: 1fr; gap: 2px; }
  .row time { font-size: 12.5px; }
  .tags:empty { display: none; }
  .doc-bar { gap: 12px; padding: 0 14px; }
  .doc-title, .wm-text { display: none; }
  .doc-actions { margin-left: auto; }
  .article-head { padding-top: 48px; }
  .prose { font-size: 17px; }
}