/* ============================================================
   Suman Adhya — personal academic site
   Theme: "Corpus" — petrol ink on soft paper, Spectral + IBM Plex
   All colours/type live here; edit tokens below to retheme.
   ============================================================ */

:root {
  --paper:        #FCFCFA;
  --paper-alt:    #F4F5F2;
  --ink:          #16202A;
  --muted:        #5A6672;
  --rule:         #E1E3DE;
  --accent:       #2C5C63;   /* petrol — links, active bits   */
  --accent-soft:  #E7EFEE;
  --ochre:        #A9772F;   /* second topic colour           */
  --slate:        #8695A0;   /* third topic colour            */

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --measure: 66ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       #12161B;
    --paper-alt:   #1A1F26;
    --ink:         #E7E9E6;
    --muted:       #9AA4AE;
    --rule:        #262C34;
    --accent:      #86B9B5;
    --accent-soft: #1B2A2C;
    --ochre:       #C79A54;
    --slate:       #7B8894;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.62;
  font-feature-settings: "kern", "liga";
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}
a:hover { border-bottom-color: var(--accent); }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- layout ---------------------------------------- */

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 32px 96px;
  display: grid;
  grid-template-columns: 268px 1fr;
  gap: 72px;
  align-items: start;
}

.rail { position: sticky; top: 56px; }

/* ---------- rail: identity -------------------------------- */

.portrait {
  width: 148px;
  height: 148px;
  object-fit: cover;
  border-radius: 3px;
  filter: grayscale(18%);
  display: block;
  margin-bottom: 22px;
}

.name {
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
}
.name span { font-weight: 300; display: block; }

.role {
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
  margin: 0 0 4px;
}
.role strong { color: var(--ink); font-weight: 500; }

.role--next {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 10px;
}

/* signature element: topic-proportion band (θ of a document) */
.band {
  display: flex;
  height: 4px;
  margin: 20px 0;
  overflow: hidden;
  border-radius: 1px;
}
.band i { display: block; height: 100%; }
.band i:nth-child(1) { background: var(--accent); }
.band i:nth-child(2) { background: var(--ochre);  }
.band i:nth-child(3) { background: var(--slate);  }
.band i:nth-child(4) { background: var(--rule);   }

/* rail section nav */
.railnav {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin-top: 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
}
.railnav a {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: none;
  padding: 3px 0;
}
.railnav a:hover { color: var(--accent); }

.links { margin: 22px 0 0; padding: 0; list-style: none; }
.links li { margin: 0 0 2px; }
.links a {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  border-bottom: none;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 3px 0;
}
.links a i { width: 15px; font-size: 13px; text-align: center; color: var(--slate); }
.links a:hover { color: var(--accent); }
.links a:hover i { color: var(--accent); }

/* ---------- content --------------------------------------- */

.lede { max-width: var(--measure); margin: 0; font-size: 17.5px; }
.lede p { margin: 0 0 1.1em; }
.lede p:last-child { margin-bottom: 0; }

/* research-interest chips */
.interests {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 1.1em;
}
.chip {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--muted);
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 3px 9px;
  line-height: 1.5;
}

/* secondary line inside a list row */
.sub {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

section { margin-top: 56px; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 6px;
}
.section-head h2 {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .13em;
  text-transform: uppercase;
  margin: 0;
  white-space: nowrap;
}
.section-head .band { flex: 1; margin: 0; }

/* ---------- news ------------------------------------------ */

.news { list-style: none; margin: 22px 0 0; padding: 0; }
.news > li {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 20px;
  padding: 9px 0;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.55;
}
.news > li:first-child { border-top: none; }
.news time {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 4px;
}
.news li.upcoming { background: var(--accent-soft); }
.news li.upcoming time { color: var(--accent); }

.pill {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 2px;
  padding: 1px 6px;
  margin-left: 8px;
  white-space: nowrap;
  vertical-align: 1px;
}

.more {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: none;
  border-bottom: 1px solid var(--rule);
  padding: 8px 0 4px;
  margin-top: 6px;
  cursor: pointer;
}
.more:hover { color: var(--accent); border-bottom-color: var(--accent); }
.more::after { content: " ↓"; }
.more[aria-expanded="true"]::after { content: " ↑"; }
[hidden] { display: none !important; }

/* ---------- publications ---------------------------------- */

.pubs { margin-top: 22px; }

.pub {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}
.pub:first-child { border-top: none; padding-top: 4px; }

.pub .year {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted);
  padding-top: 5px;
}

.pub h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 5px;
  letter-spacing: -0.005em;
}

.authors {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 7px;
}
.authors .me { color: var(--ink); font-weight: 500; }

.venue {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--muted);
  margin: 0 0 10px;
}
.venue a {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 2px 7px;
  margin-right: 8px;
  background: var(--paper-alt);
}
.venue a:hover { border-color: var(--accent); color: var(--accent); }

.pub-links { margin: 0; display: flex; flex-wrap: wrap; gap: 6px 16px; }
.pub-links a {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted);
  border-bottom: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.pub-links a:hover { color: var(--accent); }

/* ---------- plain lists (service, teaching) --------------- */

.stack { list-style: none; margin: 22px 0 0; padding: 0; }
.stack > li {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 20px;
  padding: 9px 0;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.55;
}
.stack > li:first-child { border-top: none; }
.stack .key {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 4px;
}

/* ---------- footer ---------------------------------------- */

.colophon {
  margin-top: 64px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--muted);
}
.colophon a { color: var(--muted); border-bottom-color: var(--rule); }
.colophon a:hover { color: var(--accent); }

/* ---------- responsive ------------------------------------ */

@media (max-width: 860px) {
  body { font-size: 16px; }
  .page {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 40px 22px 72px;
  }
  .rail { position: static; }
  .rail-top {
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 20px;
    align-items: center;
  }
  .portrait { width: 96px; height: 96px; margin-bottom: 0; }
  .name { font-size: 26px; margin-bottom: 8px; }
  .links {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 22px;
    margin-top: 18px;
  }
  .news > li, .pub, .stack > li { grid-template-columns: 1fr; gap: 4px; }
  .news time, .pub .year, .stack .key { padding-top: 0; }
  section { margin-top: 44px; }
}

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

@media print {
  .rail { position: static; }
  .page { display: block; max-width: none; padding: 0; }
  a { color: var(--ink); border: none; }
  .more { display: none; }
}