/* George Mather — personal site
   No framework, no web fonts: system font stacks keep first paint instant. */

:root {
  --paper: #f5f1e8;
  --paper-2: #ece6d8;
  --ink: #1c1d1f;
  --ink-soft: #4a4a48;
  --ink-faint: #67645d;
  --rule: #d7cfbd;
  --accent: #1d5c43;        /* floodlit-pitch green */
  --accent-ink: #f5f1e8;
  --highlight: #e3b04b;     /* turnstile brass */
  --card: #fbf9f4;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;

  --measure: 42rem;
  --wide: 64rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141615;
    --paper-2: #1c1f1d;
    --ink: #ece8df;
    --ink-soft: #bdb8ad;
    --ink-faint: #8f8b82;
    --rule: #2f3431;
    --accent: #6fc39a;
    --accent-ink: #0f1311;
    --highlight: #e8bb5c;
    --card: #1a1d1b;
    color-scheme: dark;
  }
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: 1rem; top: -3rem;
  background: var(--ink); color: var(--paper); padding: .5rem .8rem; z-index: 10;
}
.skip:focus { top: 1rem; }

.wrap { width: min(100% - 2rem, var(--wide)); margin-inline: auto; }

/* ---------- Header ---------- */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-block: 1rem;
}
.wordmark {
  font: 600 1.05rem/1 var(--serif); color: var(--ink); text-decoration: none; letter-spacing: .01em;
}
.wordmark span { color: var(--accent); }
.site-nav ul { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
.site-nav a {
  font: 500 .8rem/1 var(--mono); text-transform: lowercase; color: var(--ink-soft); text-decoration: none;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }
@media (max-width: 34rem) { .site-nav .optional { display: none; } }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(3rem, 9vw, 6.5rem) clamp(2.5rem, 6vw, 4.5rem); position: relative; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2rem; align-items: center; }
@media (max-width: 44rem) { .hero-grid { grid-template-columns: 1fr; } .orbit { display: none; } }

.eyebrow {
  font: 500 .78rem/1.4 var(--mono); color: var(--ink-faint); letter-spacing: .02em; margin: 0 0 1.1rem;
}
.eyebrow b { color: var(--accent); font-weight: 500; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; letter-spacing: -.01em; }

.hero h1 {
  font-size: clamp(3rem, 11vw, 6.25rem); line-height: .95; margin: 0 0 1.4rem; letter-spacing: -.035em;
}
.hero h1 .surname { display: block; font-style: italic; font-weight: 500; color: var(--accent); }
.lede { font: 1.3rem/1.5 var(--serif); color: var(--ink-soft); max-width: 36rem; margin: 0 0 2rem; }
.lede strong { color: var(--ink); font-weight: 600; }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .7rem 1.1rem; border-radius: 999px; border: 1px solid var(--ink);
  font: 500 .92rem/1 var(--sans); text-decoration: none; color: var(--ink); background: transparent;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); background: var(--accent); color: var(--accent-ink); }

/* Orbit: a nod to the MPhys dissertation on detecting exomoons around Beta Pictoris b */
.orbit { width: 15rem; height: 15rem; color: var(--ink-faint); }
.orbit .ring { fill: none; stroke: currentColor; stroke-width: 1; stroke-dasharray: 2 5; }
.orbit .planet { fill: var(--accent); }
.orbit .moon { fill: var(--highlight); }
.orbit .moon-track { transform-origin: 120px 120px; animation: orbit 18s linear infinite; }
.orbit figcaption { font: .7rem/1.3 var(--mono); text-align: center; margin-top: .5rem; }
@keyframes orbit { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .orbit .moon-track { animation: none; } }

/* ---------- Sections ---------- */
section { padding-block: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid var(--rule); }
.section-head { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 1.5rem; }
@media (max-width: 44rem) { .section-head { grid-template-columns: 1fr; gap: .25rem; } }
.section-label {
  font: 500 .78rem/2.2 var(--mono); color: var(--ink-faint); margin: 0;
  position: sticky; top: 1rem; align-self: start;
}
.section-label::before { content: "§ "; color: var(--accent); }
section h2 { font-size: clamp(1.7rem, 4vw, 2.3rem); margin: 0 0 1.25rem; }
.prose { max-width: var(--measure); }
.prose p { margin: 0 0 1.1em; }
.prose p:last-child { margin-bottom: 0; }

/* ---------- Work timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; max-width: var(--measure); }
.timeline > li {
  position: relative; padding: 0 0 2rem 1.5rem; border-left: 1px solid var(--rule);
}
.timeline > li:last-child { padding-bottom: 0; }
.timeline > li::before {
  content: ""; position: absolute; left: -5px; top: .5rem;
  width: 9px; height: 9px; border-radius: 50%; background: var(--paper); border: 2px solid var(--accent);
}
.timeline > li:first-child::before { background: var(--accent); }
.timeline h3 { font-size: 1.25rem; margin: 0; }
.timeline .meta { font: .8rem/1.6 var(--mono); color: var(--ink-faint); margin: .15rem 0 .6rem; }
.timeline p { margin: 0 0 .6rem; color: var(--ink-soft); }
.timeline ul { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); }
.timeline ul li { margin-bottom: .35rem; }

/* ---------- Stat strip ---------- */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--rule);
  border: 1px solid var(--rule); border-radius: 10px; overflow: hidden; margin: 0 0 2.25rem; max-width: var(--measure); }
.stats div { background: var(--card); padding: 1rem 1.1rem; }
.stats dt { font: .72rem/1.3 var(--mono); color: var(--ink-faint); order: 2; }
.stats dd { font: 600 1.7rem/1.1 var(--serif); margin: 0 0 .3rem; color: var(--accent); }
.stats div { display: flex; flex-direction: column-reverse; justify-content: flex-end; }
@media (max-width: 30rem) { .stats { grid-template-columns: 1fr; } }

/* ---------- Projects ---------- */
.projects { display: grid; gap: 1.25rem; }
.project {
  background: var(--card); border: 1px solid var(--rule); border-radius: 14px;
  padding: clamp(1.25rem, 3vw, 1.75rem); position: relative;
}
.project.featured { border-color: var(--accent); }
.project .kicker { font: .75rem/1.4 var(--mono); color: var(--ink-faint); margin: 0 0 .5rem; }
.project .kicker .tag {
  display: inline-block; background: var(--highlight); color: #1c1d1f; border-radius: 4px;
  padding: .05rem .4rem; margin-right: .4rem;
}
.project h3 { font-size: 1.55rem; margin: 0 0 .6rem; }
.project h3 a { color: var(--ink); text-decoration: none; }
.project h3 a::after { content: ""; position: absolute; inset: 0; border-radius: inherit; }
.project h3 a:hover { color: var(--accent); }
.project p { margin: 0 0 1rem; color: var(--ink-soft); max-width: var(--measure); }
.project .more { font: 500 .85rem/1 var(--mono); color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0 0 1rem; padding: 0; }
.chips li {
  font: .72rem/1 var(--mono); padding: .35rem .55rem; border-radius: 999px;
  border: 1px solid var(--rule); color: var(--ink-soft); background: var(--paper);
}
.project-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
@media (max-width: 44rem) { .project-pair { grid-template-columns: 1fr; } }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1.5rem 2rem; margin: 0; }
.skills dt { font: 600 1.05rem/1.3 var(--serif); margin-bottom: .35rem; }
.skills dd { margin: 0; color: var(--ink-soft); font-size: .95rem; }

/* ---------- Contact ---------- */
.contact-big {
  font: 600 clamp(1.4rem, 5vw, 2.4rem)/1.2 var(--serif); word-break: break-word;
  display: inline-block; margin: .25rem 0 1.5rem;
}
.links { display: flex; flex-wrap: wrap; gap: .75rem; list-style: none; margin: 0; padding: 0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); padding-block: 2rem 3rem; }
.site-footer p { font: .78rem/1.6 var(--mono); color: var(--ink-faint); margin: 0; }

/* ---------- Article (project pages) ---------- */
.article-head { padding-block: clamp(2.5rem, 7vw, 5rem) 2rem; }
.crumbs { font: .78rem/1.4 var(--mono); color: var(--ink-faint); margin: 0 0 1.5rem; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: .4rem; margin: 0; padding: 0; }
.crumbs li + li::before { content: "/"; margin-right: .4rem; }
.crumbs a { color: var(--ink-faint); }
.article-head h1 { font-size: clamp(2.5rem, 8vw, 4.5rem); margin: 0 0 1rem; letter-spacing: -.03em; line-height: 1; }
.article { padding-bottom: 4rem; }
.article .prose h2 { font-size: 1.6rem; margin: 2.5rem 0 .8rem; }
.article .prose h2:first-child { margin-top: 0; }
.article .prose ul { padding-left: 1.2rem; margin: 0 0 1.1em; }
.article .prose li { margin-bottom: .45rem; }
.article .prose code { font: .88em var(--mono); background: var(--paper-2); padding: .1em .35em; border-radius: 4px; }
.callout {
  border-left: 3px solid var(--highlight); background: var(--card); padding: 1rem 1.2rem;
  font: italic 1.15rem/1.5 var(--serif); margin: 0 0 1.5rem; border-radius: 0 8px 8px 0;
}
.facts { display: grid; grid-template-columns: auto 1fr; gap: .4rem 1.25rem; margin: 0 0 2rem;
  font-size: .95rem; max-width: var(--measure); }
.facts dt { font: .78rem/1.9 var(--mono); color: var(--ink-faint); }
.facts dd { margin: 0; }

/* ---------- 404 ---------- */
.lost { min-height: 60vh; display: grid; place-content: center; text-align: center; padding: 3rem 1rem; }
.lost h1 { font-size: clamp(3rem, 12vw, 6rem); margin: 0; }

/* ---------- Print: the homepage doubles as a tidy CV ---------- */
@media print {
  @page { margin: 14mm 16mm; }
  :root {
    --paper: #fff; --paper-2: #f2f2f2; --card: #fff; --ink: #000; --ink-soft: #222; --ink-faint: #555;
    --rule: #ccc; --accent: #1d5c43; --highlight: #ddd;
  }
  body { font-size: 10.5pt; line-height: 1.45; }
  .skip, .site-header, .actions, .orbit, .project .more, .links, .site-footer, .section-label { display: none !important; }
  .wrap { width: 100%; }
  .hero { padding: 0 0 6mm; }
  .hero h1 { font-size: 30pt; margin-bottom: 3mm; }
  .hero h1 .surname { display: inline; }
  .lede { font-size: 12pt; margin: 0; }
  section { padding-block: 5mm; break-inside: auto; }
  .section-head { display: block; }
  section h2 { font-size: 15pt; margin-bottom: 3mm; }
  .project, .stats, .skills > div { break-inside: avoid; }
  .timeline { padding-left: 6px; }
  .timeline h3, .timeline .meta { break-after: avoid; }
  .timeline li li { break-inside: avoid; }
  .project { border: 1px solid #ccc; padding: 4mm; }
  .project-pair { grid-template-columns: 1fr 1fr; }
  .chips li { border-color: #ccc; }
  a { color: inherit; text-decoration: none; }
  .contact-big { font-size: 13pt; margin: 0; }
}

/* ---------- Writing list ---------- */
.posts { list-style: none; margin: 0; padding: 0; max-width: var(--measure); }
.posts li { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 1rem; padding: 1.25rem 0; border-top: 1px solid var(--rule); }
.posts li:first-child { border-top: 0; padding-top: 0; }
.posts time { font: .78rem/2.2 var(--mono); color: var(--ink-faint); }
.posts h2, .posts h3 { font-size: 1.35rem; margin: 0 0 .35rem; }
.posts h2 a, .posts h3 a { color: var(--ink); text-decoration: none; }
.posts h2 a:hover, .posts h3 a:hover { color: var(--accent); text-decoration: underline; }
.posts p { margin: 0; color: var(--ink-soft); }
@media (max-width: 34rem) { .posts li { grid-template-columns: 1fr; gap: .1rem; } }

/* Secondary link inside a card whose title link covers the whole card */
.project-links { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; margin: 0; }
.project .ext { position: relative; z-index: 1; text-decoration: none; }
.project .ext:hover { text-decoration: underline; }