/* View transitions — smooth cross-fade between pages on same-origin nav */
@view-transition { navigation: auto; }

/* Local fonts — self-hosted */
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("/fonts/jetbrains-mono.woff2") format("woff2");
}
@font-face {
  font-family: "Spectral";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/spectral-400.woff2") format("woff2");
}
@font-face {
  font-family: "Spectral";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/fonts/spectral-500.woff2") format("woff2");
}
@font-face {
  font-family: "Spectral";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/fonts/spectral-600.woff2") format("woff2");
}
@font-face {
  font-family: "Spectral";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/spectral-italic.woff2") format("woff2");
}

:root {
  --paper: #FAFAF7;
  --ink: #141414;
  --ink-2: #3a3a36;
  --ink-3: #6b6b66;
  --ink-4: #9a9a93;
  --rule: #e6e4dc;
  --rule-2: #efede5;
  --accent: #5B3FB8;
  --accent-soft: #5B3FB820;
  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --body: var(--serif);
  --display: var(--serif);
  --ui: var(--mono);
  --measure: 64ch;
  --col: 720px;
  --row-pad: 22px;
}

[data-mode="paper"] {
  --paper: #F4EFE2;
  --ink: #1a1814;
  --ink-2: #3d382e;
  --ink-3: #6e6859;
  --ink-4: #9a9382;
  --rule: #ddd6c2;
  --rule-2: #e6dfca;
}

[data-mode="dark"] {
  --paper: #111110;
  --ink: #ECEBE6;
  --ink-2: #c9c7bf;
  --ink-3: #908d83;
  --ink-4: #65635c;
  --rule: #2a2925;
  --rule-2: #1f1e1b;
  --accent: #A48BFF;
  --accent-soft: #A48BFF22;
}

/* Auto dark mode based on system preference — unless user forces a specific mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-mode="light"]):not([data-mode="paper"]) {
    --paper: #111110;
    --ink: #ECEBE6;
    --ink-2: #c9c7bf;
    --ink-3: #908d83;
    --ink-4: #65635c;
    --rule: #2a2925;
    --rule-2: #1f1e1b;
    --accent: #A48BFF;
    --accent-soft: #A48BFF22;
  }
}

[data-accent="loud"]   { --accent: #4D2BC4; }
[data-accent="quiet"]  { --accent: #5B3FB8; }
[data-accent="whisper"]{ --accent: var(--ink); }
[data-mode="dark"][data-accent="whisper"] { --accent: var(--ink); }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "ss02";
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap {
  max-width: var(--col);
  margin: 0 auto;
  padding: 56px 28px 120px;
}
.wrap--wide { max-width: 920px; }

/* Header */
.site-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--rule);
  flex-wrap: nowrap;
}
.site-head .brand, .site-head .nav { flex-shrink: 0; }
.site-head .brand .sub { white-space: nowrap; }
.site-head .brand a { display: inline-block; }
.brand {
  font-family: var(--display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 10px;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand a, .brand .sub { white-space: nowrap; }
.brand a { color: var(--ink); display: inline-flex; align-items: center; }
.brand-logo { height: 18px; width: auto; display: block; }
.brand .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; transform: translateY(-2px); }
.brand .sub { color: var(--ink-3); font-family: var(--ui); font-size: 12px; font-weight: 400; letter-spacing: 0.02em; }

.nav {
  display: flex;
  gap: 22px;
  font-family: var(--ui);
  font-size: 13px;
  letter-spacing: 0.01em;
}
.nav a { color: var(--ink-3); }
.nav a:hover { color: var(--ink); text-decoration: none; }
.nav a.is-current { color: var(--ink); }
.nav a.is-current::after { content: ""; display: block; height: 1px; background: var(--accent); margin-top: 2px; }

/* Intro */
.intro {
  font-family: var(--body);
  font-size: 19px;
  color: var(--ink-2);
  margin: 0 0 56px;
  line-height: 1.5;
  text-wrap: pretty;
}
.intro .accent { color: var(--ink); font-weight: 500; }

/* Topic group */
.group { margin-bottom: 56px; }
.group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--ui);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 10px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
  flex-wrap: nowrap;
  gap: 16px;
}
.group-head > span { white-space: nowrap; flex-shrink: 0; }
.group-head .count { color: var(--ink-4); }

/* Note row */
.note { border-bottom: 1px solid var(--rule); }
.note-row {
  display: block;
  padding: var(--row-pad) 0;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: opacity 120ms ease;
}
.note-row:hover { text-decoration: none; opacity: 1; }
.note-row:hover .note-title { color: var(--accent); }

[data-density="tight"] .note-row { padding: 12px 0; }
[data-density="tight"] .note-dek { display: none; }
[data-density="comfy"] .note-row { padding: 22px 0; }
[data-density="airy"]  .note-row { padding: 32px 0; }

.chev { display: none; }

.note-eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  font-family: var(--ui);
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
  line-height: 1.4;
}
.note-eyebrow .sep { color: var(--ink-4); }
.note-eyebrow .tag { color: var(--accent); }
.note-eyebrow .tag::before { display: none; }
.note-date {
  font-family: var(--ui);
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}
.note-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 22px;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin: 0 0 10px;
  transition: color 120ms ease;
  text-wrap: balance;
}
.note-main { min-width: 0; }
.note-dek {
  font-family: var(--body);
  font-size: 15.5px;
  color: var(--ink-3);
  line-height: 1.5;
  margin: 0;
  text-wrap: pretty;
}
.note-meta { display: none; }
.tag { color: var(--ink-3); }
.tag::before { content: ""; display: inline-block; width: 5px; height: 5px; background: var(--accent); border-radius: 50%; margin-right: 6px; transform: translateY(-1px); }
.status {
  font-family: var(--ui);
  font-size: 10.5px;
  text-transform: lowercase;
  letter-spacing: 0.04em;
}
.status[data-s="working"] { color: var(--accent); }
.status[data-s="draft"] { color: var(--ink-4); }
.status[data-s="final"] { color: var(--ink-3); }

.expand { display: none; }

/* Note page (dedicated reading view) */
.back {
  display: inline-block;
  font-family: var(--ui);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
  margin-bottom: 32px;
  text-decoration: none;
}
.back:hover { color: var(--accent); text-decoration: none; }
.note-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--ui);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 22px;
}
.note-page-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 36px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--ink);
  text-wrap: balance;
}
.note-page-dek {
  font-family: var(--body);
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-3);
  margin: 0 0 36px;
  max-width: var(--measure);
  text-wrap: pretty;
}
.note-page-body { font-size: 18px; }
.note-page-body p { margin: 0 0 1.1em; }
.note-page-body ul { padding-left: 18px; }
.note-page-body li { margin-bottom: 6px; }

.related {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.related .page-eyebrow { margin-bottom: 16px; }
.related-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
}
.related-row:hover { text-decoration: none; }
.related-row:hover .related-title { color: var(--accent); }
.related-date {
  font-family: var(--ui);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.related-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 17px;
  color: var(--ink);
  line-height: 1.3;
  letter-spacing: -0.005em;
  transition: color 120ms ease;
}

/* Comments (giscus mounts inside .comments) */
.comments {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.comments .page-eyebrow {
  margin-bottom: 16px;
}
.comments .giscus,
.comments .giscus-frame {
  width: 100%;
}

/* Site footer */
.site-foot {
  margin-top: 80px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  font-family: var(--ui);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.site-foot a { color: var(--ink-3); text-decoration: none; }
.site-foot a:hover { color: var(--accent); text-decoration: none; }

.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
  align-items: start;
}

.foot-brand .foot-name {
  font-family: var(--display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.foot-brand .foot-name .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transform: translateY(-2px);
  flex-shrink: 0;
}

.foot-quote {
  font-family: var(--body);
  font-style: italic;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-3);
  max-width: 38ch;
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
}
.foot-quote cite {
  display: block;
  font-style: normal;
  font-size: 11.5px;
  color: var(--ink-4);
  margin-top: 8px;
  letter-spacing: 0.02em;
}

.foot-col .foot-label {
  font-family: var(--ui);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.foot-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.foot-col li {
  margin-bottom: 6px;
  font-family: var(--body);
  font-size: 14px;
  letter-spacing: normal;
}
.foot-col a {
  color: var(--ink-2);
}
.foot-col a:hover {
  color: var(--accent);
}

.foot-meta {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
  color: var(--ink-3);
}

/* Sub-pages */
.page-eyebrow {
  font-family: var(--ui);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.page-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 28px;
  color: var(--ink);
}
.prose {
  font-family: var(--body);
  font-size: 17.5px;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: var(--measure);
}
.prose p { margin: 0 0 1.1em; }
.prose h2 {
  font-family: var(--display);
  font-weight: 500;
  font-size: 19px;
  margin: 32px 0 10px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.prose h3 {
  font-family: var(--ui);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 28px 0 8px;
}
.prose ul { padding-left: 18px; }
.prose li { margin-bottom: 4px; }
.prose code { font-family: var(--mono); font-size: 0.9em; background: var(--rule-2); padding: 1px 5px; border-radius: 3px; }
.prose pre {
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.65;
  background: var(--rule-2);
  border: 1px solid var(--rule);
  padding: 14px 16px;
  overflow-x: auto;
}
.prose pre code { background: transparent; padding: 0; font-size: inherit; }
.prose a { color: var(--accent); text-decoration: none; }
.prose a:hover { text-decoration: underline; text-underline-offset: 3px; }

.kv {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 8px 24px;
  font-family: var(--body);
  font-size: 16px;
  color: var(--ink-2);
  margin: 24px 0;
}
.kv dt { font-family: var(--ui); font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-3); padding-top: 4px; }
.kv dd { margin: 0; }

/* .kv with row dividers (table-style) */
.kv-table {
  gap: 0;
}
.kv-table dt,
.kv-table dd {
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  align-self: start;
}
.kv-table dt {
  padding-top: 18px; /* nudge so the small-caps label aligns with body baseline */
}
.kv-table dt:first-of-type,
.kv-table dd:first-of-type {
  border-top: 0;
}

/* Study card (used on /work for the MSc) */
.study-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin: 0 0 6px;
}
.study-meta {
  font-family: var(--ui);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 16px;
}

.now-list { list-style: none; padding: 0; margin: 0; }
.now-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  align-items: baseline;
}
.now-list .when { font-family: var(--ui); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.now-list .what { color: var(--ink-2); font-size: 16.5px; }

/* Selection */
::selection { background: var(--accent-soft); color: var(--ink); }

/* Category pill — inline with note eyebrows and meta rows */
.category-pill {
  display: inline-block;
  font-family: var(--ui);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
  border: 1px solid var(--rule);
  padding: 1px 8px;
  transition: color 120ms, border-color 120ms;
}
.category-pill:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* Draft marker on blog-post */
blog-post[draft] .note-page-meta::before {
  content: "draft";
  font-family: var(--ui);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 1px 8px;
}

/* Code block header */
code-block { display: block; }
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--rule);
  border-bottom: 0;
  background: var(--rule-2);
  padding: 6px 12px;
}
.code-block-language {
  font-family: var(--ui);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.code-block-copy {
  cursor: pointer;
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 3px 10px;
  font-family: var(--ui);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  transition: color 120ms, border-color 120ms;
}
.code-block-copy:hover { color: var(--accent); border-color: var(--accent); }
.code-block-copy[data-state="copied"] { color: var(--accent); border-color: var(--accent); }

.prose code-block pre,
code-block pre {
  margin-top: 0;
  border-top: 0;
}

/* Headings-as-links */
.prose .heading-link { color: inherit; text-decoration: none; transition: color 120ms ease; }
.prose .heading-link:hover,
.prose .heading-link:focus-visible { color: var(--accent); }

/* Responsive */
@media (max-width: 640px) {
  .wrap { padding: 32px 20px 80px; }
  .site-head { flex-wrap: wrap; }
  .now-list li { grid-template-columns: 1fr; gap: 4px; }
  .kv { grid-template-columns: 1fr; gap: 2px 0; }
  .kv dd { margin-bottom: 12px; }
  .related-row { grid-template-columns: 1fr; gap: 4px; }
  .foot-grid { grid-template-columns: 1fr; gap: 32px; }
  .foot-meta { flex-direction: column; gap: 6px; align-items: flex-start; }
}

/* Print */
@media print {
  @page { margin: 1in; }
  body { background: white !important; color: black; }
  site-header, site-footer { display: none !important; }
  .back { display: none; }
  a { color: black; text-decoration: underline; }
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #555;
  }
}