/* =========================================================
   Devashish Gosain — site stylesheet
   Shared by every page. Sections are grouped by page/component.
   ========================================================= */

:root{
  --paper:#F5F4EF;
  --paper-raised:#FBFAF7;
  --ink:#181B20;
  --ink-soft:#4B5058;
  --ink-faint:#8A8E94;
  --rule:#DEDBD2;
  --rule-strong:#C7C3B7;
  --accent:#1F4B4C;      /* deep teal — signal / network */
  --accent-soft:#DCE7E5;
  --brick:#8C4A32;       /* muted terracotta-brick — used sparingly */
  --brick-soft:#EFE1D8;
  --focus:#1F4B4C;
}

/* ---------- BASE ---------- */
*{box-sizing:border-box;}
body{
  margin:0;
  min-height:100vh;
  display:flex; flex-direction:column;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
main{flex:1;}
::selection{background:var(--accent-soft); color:var(--ink);}
a{color:var(--accent); text-decoration:none;}
a:hover{text-decoration:underline;}
:focus-visible{outline:2px solid var(--focus); outline-offset:3px;}

h1,h2,h3,h4{
  font-family:'Newsreader',Georgia,serif;
  font-weight:500;
  color:var(--ink);
  margin:0;
  letter-spacing:-0.01em;
}

.mono{
  font-family:'IBM Plex Mono', monospace;
  letter-spacing:0.02em;
}
.ink{color:var(--ink);}

.wrap{
  max-width:920px;
  margin:0 auto;
  padding:0 28px;
}

/* <details>/<summary> reset — used for collapsible blocks */
summary{list-style:none; cursor:pointer;}
summary::-webkit-details-marker{display:none;}

/* ---------- NAV ---------- */
header.site-nav{
  position:sticky; top:0; z-index:100;
  background:rgba(245,244,239,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--rule);
}
.nav-inner{
  max-width:920px; margin:0 auto; padding:0 28px;
  display:flex; align-items:center; justify-content:space-between; gap:24px;
  height:58px;
}
.nav-name{
  font-family:'Newsreader',serif; font-size:17px; font-weight:600;
  color:var(--ink); white-space:nowrap;
}
.nav-name:hover{text-decoration:none;}
.nav-links{
  display:flex; gap:22px; list-style:none; margin:0; padding:0;
  overflow-x:auto;
}
.nav-links a{
  font-size:13px; color:var(--ink-soft); text-decoration:none;
  text-transform:uppercase; letter-spacing:0.06em; font-weight:500;
  white-space:nowrap; padding:4px 0; border-bottom:1px solid transparent;
  transition:color .15s, border-color .15s;
}
.nav-links a:hover, .nav-links a.active{
  color:var(--accent); border-color:var(--accent);
}

/* ---------- HERO (home page) ---------- */
.hero{
  position:relative;
  padding:88px 0 64px;
  overflow:hidden;
  border-bottom:1px solid var(--rule);
}
.hero-inner{
  max-width:920px; margin:0 auto; padding:0 28px;
  position:relative; z-index:2;
  display:grid; grid-template-columns:1fr 380px; gap:48px; align-items:start;
}
.hero-eyebrow{
  font-size:12.5px; text-transform:uppercase; letter-spacing:0.14em;
  color:var(--accent); margin-bottom:18px; display:flex; align-items:center; gap:10px;
}
.hero-eyebrow::before{
  content:""; width:26px; height:1px; background:var(--accent); display:inline-block;
}
.hero h1{
  font-size:clamp(40px,6vw,58px);
  line-height:1.04;
  margin-bottom:14px;
}
.hero .role{
  font-size:19px; color:var(--ink-soft); margin:0 0 22px; max-width:52ch;
}
.hero .role strong{color:var(--ink); font-weight:600;}
.hero p.bio{
  max-width:60ch; color:var(--ink-soft); font-size:15.5px; margin:0 0 22px;
}
.hero p.bio:last-of-type{margin-bottom:26px;}
.hero p.bio strong{color:var(--ink);}
.hero p.bio a{color:var(--ink); border-bottom:1px solid var(--rule-strong);}
.hero p.bio a:hover{border-color:var(--accent); color:var(--accent); text-decoration:none;}

.contact-row{
  display:flex; flex-wrap:wrap; gap:10px 18px; align-items:center;
}
.contact-row a{
  font-size:13.5px; color:var(--ink-soft); display:inline-flex; align-items:center; gap:6px;
  padding:6px 0; border-bottom:1px solid transparent;
}
.contact-row a:hover{color:var(--accent); text-decoration:none; border-color:var(--accent);}
.contact-row svg{width:15px; height:15px; flex-shrink:0;}

.hero-portrait{position:relative;}
.hero-portrait img{
  width:100%; aspect-ratio:4/5; object-fit:cover;
  border:1px solid var(--rule-strong);
  filter:grayscale(28%) contrast(1.02);
}
.hero-portrait .frame-tag{
  position:absolute; bottom:-11px; left:-11px;
  background:var(--paper); border:1px solid var(--rule-strong);
  font-size:10.5px; padding:4px 8px; color:var(--ink-faint);
  letter-spacing:0.06em;
}


/* ---------- PAGE / SECTION SHELL ---------- */
section{padding:64px 0; border-bottom:1px solid var(--rule);}
section:last-of-type{border-bottom:none;}
section[id]{scroll-margin-top:58px;} /* keep anchor targets clear of the sticky nav */
.section-head{
  display:flex; align-items:baseline; justify-content:space-between; gap:16px;
  margin-bottom:34px;
}
.section-head h1{font-size:34px;}
.section-head h2{font-size:28px;}
.section-num{
  font-size:12px; color:var(--ink-faint); white-space:nowrap;
}
.section-intro{
  max-width:68ch; color:var(--ink-soft); font-size:15px; margin:-20px 0 32px;
}
.section-intro strong{color:var(--ink);}
.prose{
  max-width:68ch; color:var(--ink-soft); font-size:15px; margin:0 0 16px;
}

/* ---------- BUTTONS ---------- */
.btn-line{
  display:inline-flex; align-items:center; gap:8px;
  background:none; border:none; cursor:pointer;
  font-family:'IBM Plex Mono',monospace; font-size:12.5px;
  color:var(--accent); text-transform:uppercase; letter-spacing:0.06em;
  padding:8px 0; border-bottom:1px solid var(--accent);
}
.btn-line:hover{background:var(--accent-soft);}
.btn-line svg{width:12px; height:12px; transition:transform .2s;}
.btn-line.open svg,
details[open] > summary.btn-line svg{transform:rotate(180deg);}

/* swap label text inside a <summary> depending on open/closed */
details > summary .when-open{display:none;}
details[open] > summary .when-open{display:inline;}
details[open] > summary .when-closed{display:none;}

/* ---------- NEWS ---------- */
.news-list{list-style:none; margin:0; padding:0;}
.news-list li{
  display:grid; grid-template-columns:96px 1fr; gap:20px;
  padding:13px 0; border-top:1px solid var(--rule);
  font-size:14.5px;
}
.news-list li:first-child{border-top:none;}
.news-list li[hidden]{display:none;}
.news-date{
  font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--ink-faint);
  padding-top:2px;
}
.news-text{color:var(--ink-soft);}
.news-text strong{color:var(--ink); font-weight:600;}
.news-text a{color:var(--accent);}
.news-more{margin-top:22px;}

/* ---------- RESEARCH ---------- */
.thrusts{
  display:grid; grid-template-columns:1fr 1fr; gap:1px;
  background:var(--rule); border:1px solid var(--rule);
}
.thrust{
  background:var(--paper-raised); padding:26px 26px 24px;
}
.thrust.wide{grid-column:1/-1;}
.thrust .idx{
  font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--accent); margin-bottom:10px; display:block;
}
.thrust h3{font-size:18.5px; margin-bottom:9px; line-height:1.25;}
.thrust p{font-size:14px; color:var(--ink-soft); margin:0;}

.research-more{margin-top:30px;}
.research-more-body{
  padding-top:22px; border-top:1px solid var(--rule); margin-top:22px;
}
.research-more-body h4{font-size:16px; margin:22px 0 8px;}
.research-more-body h4:first-child{margin-top:0;}
.research-more-body p{font-size:14.5px; color:var(--ink-soft); margin:0 0 6px;}

/* ---------- PUBLICATIONS ---------- */
.pub-year{margin-bottom:6px;}
.pub-year-header{
  display:flex; align-items:center; gap:14px;
  padding:14px 0; border-top:1px solid var(--rule);
}
.pub-year-header .yr{
  font-family:'Newsreader',serif; font-size:22px; color:var(--ink); min-width:64px;
}
.pub-year-header .count{
  font-family:'IBM Plex Mono',monospace; font-size:11.5px; color:var(--ink-faint);
  flex:1;
}
.pub-year-header .chev{
  width:11px; height:11px; border-right:1.5px solid var(--ink-faint); border-bottom:1.5px solid var(--ink-faint);
  transform:rotate(45deg); transition:transform .2s; margin-right:3px;
}
.pub-year[open] .chev{transform:rotate(-135deg);}
.pub-year-body{padding:2px 0 22px;}

.pub-item{
  padding:16px 0;
  border-top:1px dashed var(--rule);
  display:grid; grid-template-columns:auto 1fr; gap:16px;
}
.pub-item:first-child{border-top:none;}
.pub-tag{
  font-family:'IBM Plex Mono',monospace; font-size:10.5px; text-transform:uppercase;
  color:var(--accent); background:var(--accent-soft); padding:4px 8px;
  height:fit-content; white-space:nowrap; letter-spacing:0.04em;
}
.pub-tag.award{color:var(--brick); background:var(--brick-soft);}
.pub-body h4{
  font-size:16px; font-weight:500; line-height:1.32; margin-bottom:5px;
}
.pub-authors{font-size:13px; color:var(--ink-soft); margin:0 0 4px;}
.pub-authors .me{color:var(--ink); font-weight:600;}
.pub-venue{font-size:12.5px; color:var(--ink-faint); margin:0;}
.pub-links{margin-top:6px; display:flex; gap:14px;}
.pub-links a{font-size:12px; font-family:'IBM Plex Mono',monospace; text-transform:uppercase; letter-spacing:0.04em;}
.pub-award-note{
  display:inline-block; margin-top:6px; font-size:12px; color:var(--brick);
  font-style:italic; font-family:'Newsreader',serif;
}

/* ---------- GROUP ---------- */
/* Default cards (current PhD scholars). Add class "small" to a grid
   (<div class="group-grid small">) for the compact size used by every
   other category. */
.group-grid{
  display:grid; grid-template-columns:repeat(auto-fill, 180px); gap:28px;
}
.group-grid.small{
  grid-template-columns:repeat(auto-fill, 130px); gap:22px;
}
.group-grid.small .group-card img{margin-bottom:10px;}
.group-grid.small .group-card h4{font-size:14.5px;}
.group-grid.small .group-card .role,
.group-grid.small .group-card .link{font-size:11.5px;}
.group-grid.small .group-card .topic{font-size:12.5px;}
.group-card img{
  width:100%; aspect-ratio:1/1; object-fit:cover;
  filter:grayscale(35%); border:1px solid var(--rule-strong);
  margin-bottom:14px;
}
.group-card h4{font-size:16px; margin-bottom:4px;}
.group-card .role{font-size:12.5px; color:var(--accent); font-family:'IBM Plex Mono',monospace;}
.group-card .topic{font-size:13.5px; color:var(--ink-soft); margin:6px 0 0;}
.group-card .link{font-size:12.5px; margin-top:6px; display:block;}
.group-subhead{font-size:20px; margin:48px 0 22px;}
.group-subhead:first-of-type{margin-top:0;}

/* ---------- PROSPECTIVE STUDENTS ---------- */
.quote-block{
  border-left:2px solid var(--accent);
  padding:4px 0 4px 26px; margin:28px 0;
}
.quote-block .devanagari{
  font-size:16px; color:var(--ink); margin-bottom:8px; line-height:1.7;
}
.quote-block .translation{
  font-family:'Newsreader',serif; font-style:italic; font-size:16.5px; color:var(--ink-soft);
}
.principles{margin:26px 0; padding:0; list-style:none;}
.principles li{
  position:relative; padding:12px 0 12px 26px; font-size:15px; color:var(--ink-soft);
  border-top:1px solid var(--rule);
}
.principles li:first-child{border-top:none;}
.principles li::before{
  content:"—"; position:absolute; left:0; color:var(--accent);
}
.principles li a{color:var(--ink);}

.venue-cols{
  display:grid; grid-template-columns:1fr 1fr; gap:28px; margin:26px 0;
  background:var(--paper-raised); border:1px solid var(--rule); padding:24px 26px;
}
.venue-cols h4{
  font-size:13px; text-transform:uppercase; letter-spacing:0.06em; color:var(--accent); margin-bottom:10px;
}
.venue-cols p{font-size:14px; color:var(--ink-soft); margin:0;}

.cycle-strip{
  font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--ink-soft);
  line-height:2.1; background:var(--paper-raised); border:1px solid var(--rule);
  padding:18px 20px; margin:24px 0; overflow-x:auto; white-space:nowrap;
}
.cycle-strip b{color:var(--ink);}
.cycle-strip .faint{color:var(--ink-faint);}

.sub-head{font-size:22px; margin:44px 0 18px;}
.figure{
  margin:0 0 28px; padding:18px;
  background:#fff; border:1px solid var(--rule);
}
.figure img{display:block; width:100%; height:auto;}

.guidelines{margin:0; padding:0 0 0 22px; max-width:72ch;}
.guidelines li{
  font-size:15px; color:var(--ink-soft); padding:10px 0 10px 6px;
  border-top:1px solid var(--rule);
}
.guidelines li:first-child{border-top:none;}
.guidelines li::marker{font-family:'IBM Plex Mono',monospace; font-size:12.5px; color:var(--accent);}

/* placeholder card for an open position on the Group page */
.group-card.open-slot img{filter:none; border-style:dashed;}
.group-card.open-slot h4{color:var(--ink-faint);}

/* ---------- TEACHING ---------- */
.course-list{list-style:none; margin:0 0 8px; padding:0;}
.course-list li{
  display:grid; grid-template-columns:120px 1fr; gap:20px;
  padding:14px 0; border-top:1px solid var(--rule);
}
.course-list li:first-child{border-top:none;}
.course-term{
  font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--accent);
  padding-top:3px;
}
.course-list h4{font-size:16.5px; line-height:1.32; margin-bottom:3px;}
.course-code{
  font-family:'IBM Plex Mono',monospace; font-size:11.5px; color:var(--ink-faint);
  margin-left:6px; letter-spacing:0.02em;
}
.course-meta{font-size:13px; color:var(--ink-soft); margin:0;}

/* tighter vertical rhythm on the Teaching page */
.teaching{padding:44px 0;}
.teaching .section-head{margin-bottom:22px;}
.teaching .group-subhead{font-size:18px; margin:28px 0 8px;}
.teaching .group-subhead:first-of-type{margin-top:0;}
.teaching .course-list li{padding:8px 0;}
.teaching .course-list h4{font-size:15.5px; margin-bottom:1px;}
.teaching .course-meta{font-size:12.5px;}
.teaching .course-term{padding-top:2px;}

/* ---------- SERVICE ---------- */
.service-grid{columns:2; column-gap:40px;}
.service-year{break-inside:avoid; margin-bottom:22px;}
.service-year h4{
  font-family:'IBM Plex Mono',monospace; font-size:13px; color:var(--accent);
  margin-bottom:8px; font-weight:500;
}
.service-year ul{margin:0; padding:0; list-style:none;}
.service-year li{
  font-size:14px; color:var(--ink-soft); padding:5px 0; border-top:1px solid var(--rule);
}
.service-year li:first-child{border-top:none;}
.service-year li b{color:var(--ink); font-weight:600;}

/* ---------- FOOTER ---------- */
footer{
  padding:52px 0 60px;
  border-top:1px solid var(--rule);
}
.footer-grid{
  display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:24px;
}
.footer-links{display:flex; gap:20px; flex-wrap:wrap;}
.footer-links a{
  font-size:12.5px; font-family:'IBM Plex Mono',monospace; text-transform:uppercase;
  color:var(--ink-soft); letter-spacing:0.04em;
}
.footer-links a:hover{color:var(--accent);}
.footer-fine{
  margin-top:36px; padding-top:20px; border-top:1px solid var(--rule);
  font-size:12px; color:var(--ink-faint); display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width:820px){
  .hero-inner{grid-template-columns:1fr;}
  .hero-portrait{max-width:380px;}
}
@media (max-width:680px){
  .thrusts{grid-template-columns:1fr;}
  .service-grid{columns:1;}
}
@media (max-width:600px){
  .wrap, .nav-inner, .hero-inner{padding:0 16px;}
  .nav-links{gap:14px;}
  .nav-links a{font-size:11.5px;}
  section{padding:48px 0;}
  .section-head{flex-direction:column; gap:4px;}
  .section-head h1{font-size:28px;}
  .news-list li, .course-list li{grid-template-columns:1fr; gap:2px;}
  .pub-item{grid-template-columns:1fr;}
  .pub-tag{width:fit-content;}
  .venue-cols{grid-template-columns:1fr;}
}
@media (max-width:440px){
  .group-grid{grid-template-columns:repeat(2,1fr); gap:20px;}
  .group-grid.small{grid-template-columns:repeat(3,1fr); gap:14px;}
}

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