/* ==========================================================================
   Boyan Angelov — site styles
   Monochrome, editorial. Type after santafe.edu features:
   Libre Baskerville (headlines, reading), Space Mono (labels), Barlow (UI).
   To retheme, change the custom properties in :root.
   ========================================================================== */

:root {
  --ink: #111111;
  --ink-soft: #333333;
  --muted: #6e6e6e;
  --line: #d9d9d9;
  --paper: #ffffff;
  --wash: #f4f4f4;

  --serif: "Libre Baskerville", Georgia, "Times New Roman", serif;
  --sans: "Barlow", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "Space Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --wrap: 72rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ---------- Reset-ish ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
img, iframe { max-width: 100%; }
img { display: block; height: auto; }
::selection { background: var(--ink); color: var(--paper); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(17, 17, 17, 0.35);
  transition: text-decoration-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}
a:hover { text-decoration-color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* Mono label look, reused across the site */
.label,
.site-nav a,
.tags li,
.card-date,
.meta,
.button,
.site-footer,
.prose h2 {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

main.wrap { flex: 1; padding-top: 3rem; padding-bottom: 4rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: none;
  min-height: 4.5rem;
}

.brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  padding: 0.4rem 0.7rem;
  text-decoration: none;
  border: 1px solid transparent;
}
.site-nav a:hover { border-color: var(--ink); }
.site-nav a.active { background: var(--ink); color: var(--paper); }

.nav-toggle {
  display: none;
  margin-left: auto;
  font: inherit;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  background: none;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .header-inner { flex-wrap: wrap; gap: 0; }
  .nav-toggle { display: block; }
  .site-nav { display: none; width: 100%; padding: 0.5rem 0 1rem; }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; }
}

/* ---------- Page headers ---------- */
.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--ink);
}

.page-header h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0;
}

.subtitle {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.15rem;
  margin: 0.6rem 0 0;
}

.lead {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 1.25rem 0 0;
  max-width: 46rem;
}

.meta { color: var(--muted); margin: 1.25rem 0 0; }

/* ---------- Prose (markdown bodies) ---------- */
.prose { max-width: 46rem; }
.prose p, .prose li {
  font-family: var(--serif);
  font-size: 0.98rem;
  line-height: 1.8;
}
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose li { margin-bottom: 0.35rem; }
.prose img { margin: 2rem 0; border: 1px solid var(--line); }
.prose h3 { font-size: 1.35rem; margin-top: 2rem; }
.prose blockquote {
  margin: 0 0 2rem;
  padding: 1rem 1.25rem;
  border-left: 2px solid var(--ink);
  background: var(--wash);
}
.prose blockquote p { margin: 0; }

/* Section headings: mono label with a hairline rule */
.prose h2 {
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 3rem 0 1.25rem;
}
.prose h2::after { content: ""; flex: 1; height: 1px; background: var(--ink); }
.prose > h2:first-child { margin-top: 0; }

.page-image { width: 20rem; margin-bottom: 2rem; }

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}
.tags li {
  font-size: 0.62rem;
  border: 1px solid var(--ink);
  padding: 0.12rem 0.45rem;
  line-height: 1.5;
}

/* Buttons */
.button {
  display: inline-block;
  color: var(--ink);
  text-decoration: none;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--ink);
}
.button:hover { background: var(--ink); color: var(--paper); }

/* Embedded video */
.video {
  position: relative;
  aspect-ratio: 16 / 9;
  margin: 0 0 2.5rem;
  background: var(--ink);
}
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Home ---------- */
.home {
  display: grid;
  grid-template-columns: 20rem minmax(0, 1fr);
  gap: 4rem;
  align-items: start;
  padding-top: 1rem;
}

.home-card { position: sticky; top: 7rem; }

.home-photo {
  width: 100%;
  margin-bottom: 1.75rem;
}

.home-name { font-size: 2.6rem; line-height: 1.05; margin: 0 0 0.9rem; }

.home-tagline {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 2rem;
}
.home-tagline span { white-space: nowrap; }

.home-links {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--ink);
}
.home-links .label { color: var(--muted); padding: 0.9rem 0 0.6rem; }
.home-links a {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-decoration: none;
  padding: 0.85rem 0.25rem;
  border-bottom: 1px solid var(--line);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), padding 0.2s var(--ease);
}
.home-links a:first-of-type { border-top: 1px solid var(--line); }
.home-links a::after { content: "↗"; transition: transform 0.2s var(--ease); }
.home-links a:hover { background: var(--ink); color: var(--paper); padding-inline: 0.75rem; }
.home-links a:hover::after { transform: translate(2px, -2px); }

.home-body {
  max-width: 46rem;
  padding-left: 4rem;
  border-left: 1px solid var(--line);
}

/* Focus areas: numbered editorial list */
.home-body > h2 + ul {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: focus;
  border-top: 1px solid var(--line);
}
.home-body > h2 + ul li {
  counter-increment: focus;
  position: relative;
  margin: 0;
  padding: 1.25rem 0 1.25rem 3.25rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  line-height: 1.6;
}
.home-body > h2 + ul li::before {
  content: "0" counter(focus);
  position: absolute;
  left: 0;
  top: 1.45rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.home-body > h2 + ul strong {
  display: block;
  font-weight: 400;
  font-size: 1.3rem;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

@media (max-width: 900px) {
  .home { grid-template-columns: 1fr; gap: 2.5rem; padding-top: 0; }
  .home-card { position: static; max-width: 22rem; width: 100%; margin: 0 auto; }
  .home-body { padding-left: 0; border-left: none; }
}

/* ---------- Listings (Work, Film, Books, Courses) ---------- */
.listing-tools { display: flex; justify-content: flex-end; margin: -0.5rem 0 1.5rem; }

.filter {
  font-family: var(--mono);
  font-size: 0.8rem;
  width: 14rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
}
.filter:focus { outline: none; box-shadow: 0 0 0 2px rgba(17, 17, 17, 0.15); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 1.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color 0.25s var(--ease);
}
.card[hidden] { display: none; }

.card-img {
  height: var(--img-h, 180px);
  flex-shrink: 0;
  overflow: hidden;
  background: var(--wash);
  border-bottom: 1px solid var(--line);
}
.card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.75rem;
  filter: grayscale(1);
  transition: filter 0.4s var(--ease);
}

.card-body { display: flex; flex-direction: column; flex: 1; padding: 1.1rem 1.2rem 1.25rem; }
.card-title { font-size: 1.08rem; line-height: 1.35; margin: 0 0 0.35rem; }
.card-subtitle { font-family: var(--serif); font-style: italic; font-size: 0.9rem; color: var(--ink-soft); margin: 0 0 0.75rem; }
.card-text { font-size: 0.95rem; line-height: 1.5; color: var(--muted); margin: 0 0 1rem; }
.card-date { color: var(--muted); margin: auto 0 0; text-align: right; }

.card:hover { border-color: var(--ink); }
.card:hover .card-img img { filter: grayscale(0); }
.card:hover .card-title { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

.filter-empty { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }

/* ---------- Software ---------- */
.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}
.software-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transition: background 0.25s var(--ease);
}
.software-card:hover { background: var(--wash); }
.software-card .card-icon {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-bottom: 1.25rem;
  font-size: 1.3rem;
  line-height: 1;
  border: 1px solid var(--ink);
  filter: grayscale(1);
}
.software-card h2 { font-size: 1.5rem; margin: 0 0 0.75rem; }
.software-card h2 a { text-decoration: none; }
.software-card h2 a:hover { text-decoration: underline; }
.software-card .prose p { font-size: 0.92rem; color: var(--ink-soft); margin: 0 0 1.25rem; }
.software-card .button { margin-top: auto; align-self: flex-start; }

/* ---------- Research ---------- */
.research-list .prose { max-width: 50rem; }
.research-list .prose ul { list-style: none; padding: 0; margin: 0; }
.research-list .prose li {
  margin: 0;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  line-height: 1.75;
  color: #222;
}
.research-list .prose li:first-child { padding-top: 0; }

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--ink);
  padding: 2rem var(--gutter);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

/* Images inside pages follow the monochrome scheme; colour returns on hover */
.prose img { filter: grayscale(1); transition: filter 0.4s var(--ease); }
.prose img:hover { filter: grayscale(0); }