/* =========================================================
   Chitrakāvya — Research Project (rebuilt landing site)
   A new computing paradigm at the seam of Sanskrit poetics
   and combinatorial mathematics.
   Research-paper aesthetic, single shared stylesheet.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400&family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400&family=Inter:wght@400;500;600&family=Tiro+Devanagari+Sanskrit:ital@0;1&display=swap');

:root {
  --paper:        #f7f1e3;
  --paper-2:      #efe6d2;
  --ink:          #1f1b16;
  --ink-soft:     #3b342b;
  --rule:         #c9b48a;
  --saffron:      #b8581c;
  --saffron-dk:   #7a3a14;
  --indigo:       #283561;
  --moss:         #4f6b3a;
  --gold:         #a07e2a;
  --max:          1080px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'EB Garamond', 'Cormorant Garamond', Georgia, serif;
  font-size: 19px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* subtle paper texture */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(40,30,15,0.04) 1px, transparent 1px),
    radial-gradient(rgba(40,30,15,0.03) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 1px;
  z-index: 0;
}

main, header, footer, nav { position: relative; z-index: 1; }

/* ---------------- header ---------------- */
.site-head {
  border-bottom: 1px solid var(--rule);
  background:
    linear-gradient(180deg, rgba(255,253,247,0.6), rgba(247,241,227,0.0)),
    var(--paper);
}
.site-head .wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 28px 20px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 18px;
  text-decoration: none;
  color: var(--ink);
}
.brand .seal { width: 64px; height: 64px; flex: none; }
.brand h1 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 36px;
  line-height: 1.05;
  letter-spacing: 0.02em;
  margin: 0;
}
.brand .skt {
  font-family: 'Tiro Devanagari Sanskrit', serif;
  font-weight: 400;
  font-size: 30px;
  color: var(--saffron-dk);
  letter-spacing: 0.01em;
}
.brand small {
  display: block;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 4px;
}

.site-nav {
  display: flex;
  gap: 22px;
  align-items: center;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .15s, border-color .15s;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--saffron-dk);
  border-bottom-color: var(--saffron);
}

/* ---------------- hero band ---------------- */
.hero {
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(184,88,28,0.10), transparent 60%),
    var(--paper);
  padding: 56px 0 64px;
}
.hero .wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.hero h2 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 500;
  font-size: 48px;
  line-height: 1.08;
  letter-spacing: 0.005em;
  margin: 0 0 16px;
}
.hero h2 em {
  font-style: italic;
  color: var(--saffron-dk);
}
.hero p.lede {
  font-size: 21px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 24px;
  max-width: 56ch;
}
.hero .meta {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 28px 0 0;
}
.hero-art {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 6px 14px rgba(40,30,15,0.08));
}

/* ---------------- general layout ---------------- */
main.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 28px 80px;
}
section { margin-bottom: 72px; }
section h3 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 30px;
  letter-spacing: 0.005em;
  margin: 0 0 6px;
}
section h3 .skt {
  font-family: 'Tiro Devanagari Sanskrit', serif;
  font-weight: 400;
  font-size: 24px;
  color: var(--saffron-dk);
  margin-left: 10px;
}
section .kicker {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--saffron-dk);
  margin: 0 0 6px;
}
section p { margin: 0 0 14px; }

a {
  color: var(--saffron-dk);
  text-decoration: none;
  border-bottom: 1px solid rgba(184,88,28,0.35);
  transition: border-color .15s;
}
a:hover { border-bottom-color: var(--saffron); }

/* dropcap for first paragraph of an article */
.dropcap::first-letter {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 64px;
  line-height: 0.85;
  float: left;
  padding: 6px 10px 0 0;
  color: var(--saffron-dk);
}

blockquote.skt {
  font-family: 'Tiro Devanagari Sanskrit', serif;
  font-size: 22px;
  line-height: 1.7;
  color: var(--ink);
  border-left: 3px solid var(--saffron);
  margin: 22px 0;
  padding: 6px 18px;
  background: rgba(255,253,247,0.5);
}
blockquote.skt small {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 6px;
}

/* ---------------- card grids ---------------- */
.grid {
  display: grid;
  gap: 24px;
}
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two   { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 820px) {
  .grid.three, .grid.two { grid-template-columns: 1fr; }
  .hero .wrap { grid-template-columns: 1fr; }
  .site-head .wrap { grid-template-columns: 1fr; }
  .site-nav { flex-wrap: wrap; gap: 14px 18px; }
}

.card {
  background: rgba(255,253,247,0.55);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 22px 22px 18px;
  display: flex;
  flex-direction: column;
}
.card .art {
  width: 100%;
  aspect-ratio: 1 / 1;
  margin-bottom: 14px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.card .art svg { width: 100%; height: 100%; display: block; }
.card h4 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 22px;
  margin: 0 0 4px;
}
.card h4 .skt {
  font-family: 'Tiro Devanagari Sanskrit', serif;
  font-weight: 400;
  font-size: 18px;
  color: var(--saffron-dk);
  margin-left: 6px;
}
.card .tag {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.card p { font-size: 17px; line-height: 1.55; margin: 0 0 12px; color: var(--ink-soft); }
.card .links {
  margin-top: auto;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  letter-spacing: 0.06em;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.card .links a { border: none; }
.card .links a::before { content: "› "; color: var(--saffron); }

/* ---------------- index hero links ---------------- */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
@media (max-width: 820px) { .entry-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .entry-grid { grid-template-columns: 1fr; } }
.entry-grid a {
  display: block;
  padding: 20px 22px;
  border-right: 1px solid var(--rule);
  color: var(--ink);
  text-decoration: none;
  border-bottom: none;
  transition: background .15s;
}
.entry-grid a:last-child { border-right: none; }
.entry-grid a:hover { background: rgba(184,88,28,0.06); }
.entry-grid .num {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--saffron-dk);
}
.entry-grid .ttl {
  display: block;
  font-family: 'Cormorant Garamond', serif;
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  margin: 4px 0 6px;
}
.entry-grid .sub {
  font-family: 'EB Garamond', serif;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 16px;
}

/* ---------------- small utilities ---------------- */
hr.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 32px 0;
}
.note {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--ink-soft);
  background: rgba(255,253,247,0.7);
  border-left: 3px solid var(--gold);
  padding: 12px 16px;
  margin: 16px 0;
  line-height: 1.55;
}

/* ---------------- footer ---------------- */
footer.site-foot {
  border-top: 1px solid var(--rule);
  background: var(--paper);
}
footer.site-foot .wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--ink-soft);
}
@media (max-width: 820px) { footer.site-foot .wrap { grid-template-columns: 1fr; } }
footer.site-foot h5 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 17px;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
  color: var(--ink);
}
footer.site-foot ul { margin: 0; padding: 0; list-style: none; }
footer.site-foot li { margin-bottom: 4px; }
footer.site-foot a { color: var(--ink-soft); border: none; }
footer.site-foot a:hover { color: var(--saffron-dk); }
footer.site-foot .colophon {
  font-style: italic;
  font-family: 'EB Garamond', serif;
  font-size: 15px;
  line-height: 1.55;
}

/* ---------------- knight-tour interactive ---------------- */
.kt-wrap {
  display: grid;
  grid-template-columns: minmax(0,1fr) 320px;
  gap: 28px;
  align-items: start;
  margin-top: 16px;
}
@media (max-width: 820px) { .kt-wrap { grid-template-columns: 1fr; } }

.kt-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  aspect-ratio: 8 / 4;
  border: 2px solid var(--ink);
  background: var(--paper-2);
  user-select: none;
  font-family: 'Tiro Devanagari Sanskrit', serif;
}
.kt-cell {
  position: relative;
  display: grid;
  place-items: center;
  font-size: 22px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: transparent;
  transition: background .25s;
}
.kt-cell.dark { background: rgba(184,88,28,0.10); }
.kt-cell.visited { background: rgba(40,53,97,0.18); color: var(--indigo); }
.kt-cell.current { background: var(--saffron); color: #fff8ec; }
.kt-cell .num {
  position: absolute;
  top: 3px; left: 5px;
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  color: var(--ink-soft);
  opacity: 0.75;
}

.kt-controls {
  display: flex; flex-direction: column; gap: 14px;
  font-family: 'Inter', sans-serif;
}
.kt-controls h4 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: 22px;
  margin: 0;
}
.kt-controls .btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.kt-controls button {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 2px;
  transition: background .12s;
}
.kt-controls button.alt {
  background: transparent;
  color: var(--ink);
}
.kt-controls button:hover { background: var(--saffron-dk); border-color: var(--saffron-dk); color: var(--paper); }
.kt-controls .verses {
  border: 1px solid var(--rule);
  padding: 14px;
  background: rgba(255,253,247,0.7);
  font-family: 'Tiro Devanagari Sanskrit', serif;
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
}
.kt-controls .verses small {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 6px;
}

/* ---------------- sarvatobhadra grid ---------------- */
.stb-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  max-width: 480px;
  margin: 14px 0;
  border: 2px solid var(--ink);
  font-family: 'Tiro Devanagari Sanskrit', serif;
}
.stb-grid div {
  aspect-ratio: 1;
  display: grid; place-items: center;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: 18px;
  background: var(--paper-2);
}
.stb-grid div.hot { background: rgba(184,88,28,0.20); color: var(--saffron-dk); }

/* ---------------- references / resources ---------------- */
ol.refs, ul.refs {
  padding-left: 22px;
  margin: 8px 0 0;
}
ol.refs li, ul.refs li {
  margin-bottom: 10px;
  line-height: 1.55;
}

/* ---------------- knuth pair (English chitrakavya) ---------------- */
.knuth-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin: 18px 0;
}
@media (max-width: 820px) { .knuth-pair { grid-template-columns: 1fr; } }
.knuth-pair > div { min-width: 0; }
.knuth-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--saffron-dk);
  margin-bottom: 6px;
}
.knuth-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  border: 2px solid var(--ink);
  background: var(--paper-2);
  font-family: 'EB Garamond', serif;
}
.knuth-grid > div {
  position: relative;
  aspect-ratio: 1.6 / 1;
  padding: 4px 2px;
  display: grid; place-items: center;
  font-size: 13px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  text-align: center;
  line-height: 1.05;
  word-break: break-word;
  background: transparent;
  transition: background .25s;
}
.knuth-grid > div .num {
  position: absolute; top: 1px; left: 3px;
  font-family: 'Inter', sans-serif;
  font-size: 8px;
  color: var(--ink-soft);
  opacity: 0.55;
}
.knuth-grid > div.dark { background: rgba(184,88,28,0.08); }
.knuth-grid > div.visited { background: rgba(40,53,97,0.18); color: var(--indigo); }
.knuth-grid > div.current { background: var(--saffron); color: #fff8ec; }
.knuth-grid > div.match { background: rgba(79,107,58,0.22); color: var(--moss); font-weight: 600; }
.knuth-grid > div.jumping {
  animation: knightJump 220ms ease-out;
  z-index: 2;
}
@keyframes knightJump {
  0%   { transform: scale(1.00); box-shadow: 0 0 0 0 rgba(184,88,28,0.55); }
  35%  { transform: scale(1.18); box-shadow: 0 0 0 10px rgba(184,88,28,0.00); }
  100% { transform: scale(1.00); }
}

.knuth-controls {
  display: flex; flex-wrap: wrap; gap: 8px;
  align-items: center;
  font-family: 'Inter', sans-serif;
  margin-top: 10px;
}
.knuth-controls button {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 7px 12px;
  cursor: pointer;
  border-radius: 2px;
}
.knuth-controls button.alt {
  background: transparent; color: var(--ink);
}
.knuth-controls button:hover {
  background: var(--saffron-dk); border-color: var(--saffron-dk); color: var(--paper);
}
.knuth-controls .move {
  font-size: 12px; color: var(--ink-soft); margin-left: 6px;
}
.knuth-controls audio { height: 32px; }

.knuth-verse {
  background: rgba(255,253,247,0.7);
  border: 1px solid var(--rule);
  padding: 12px 14px;
  margin-top: 10px;
  font-family: 'EB Garamond', serif;
  font-size: 16px;
  line-height: 1.55;
}
.knuth-verse small {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-soft); margin-bottom: 4px;
}

/* tiny helpers */
.row { display: flex; flex-wrap: wrap; gap: 14px; }
.pill {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: rgba(40,53,97,0.10);
  color: var(--indigo);
  padding: 3px 9px;
  border-radius: 2px;
}
.pill.saff { background: rgba(184,88,28,0.14); color: var(--saffron-dk); }
.pill.moss { background: rgba(79,107,58,0.15); color: var(--moss); }