/* ==========================================================================
   Soft Computing Lab — IIT Roorkee
   Design tokens
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:        #0F1B2E;   /* deep navy — headers / dark sections */
  --ink-soft:   #223350;   /* lighter navy for gradients */
  --paper:      #F2F4F1;   /* cool paper, faint sage-grey */
  --paper-raise:#FFFFFF;
  --brass:      #B8862E;   /* warm brass accent */
  --brass-soft: #E4C77F;
  --teal:       #1B4B6B;   /* secondary accent, swarm particles */
  --slate:      #52607A;   /* secondary text */
  --slate-light:#8593AA;
  --line:       #DBDFDA;
  --line-dark:  #33415C;
  --text:       #16202F;
  --text-inv:   #F2F4F1;
  --shadow:     0 1px 2px rgba(15,27,46,.06), 0 8px 24px rgba(15,27,46,.06);
  --radius:     3px;

  --font-display: 'Fraunces', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{ font-family: var(--font-display); font-weight:600; margin:0; color: var(--ink); line-height:1.15; }
p{ margin:0 0 1em; color: var(--slate); }
button{ font-family: inherit; cursor:pointer; }

:focus-visible{ outline: 2px solid var(--brass); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

.wrap{ max-width: 1180px; margin: 0 auto; padding: 0 32px; }
.eyebrow{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brass);
  display:flex; align-items:center; gap:8px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content:"";
  width:6px; height:6px; border-radius:50%;
  background: var(--brass);
  display:inline-block;
}

/* ---------------- Header / Nav ---------------- */
.site-header{
  position: sticky; top:0; z-index: 100;
  background: rgba(242,244,241,.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 32px;
  max-width: 1180px; margin:0 auto;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand img{ width:40px; height:40px; }
.brand .name{ font-family: var(--font-display); font-size: 17px; font-weight:600; color: var(--ink); line-height:1.1; }
.brand .sub{ font-family: var(--font-mono); font-size: 10.5px; letter-spacing:.06em; color: var(--slate); text-transform:uppercase; }

.nav-links{ display:flex; gap:2px; align-items:center; }
.nav-links a{
  font-size: 14px; font-weight:500; color: var(--slate);
  padding: 8px 14px; border-radius: var(--radius);
  transition: color .15s ease, background .15s ease;
}
.nav-links a:hover{ color: var(--ink); background: rgba(15,27,46,.05); }
.nav-links a.active{ color: var(--ink); font-weight:600; }
.nav-links a.active::after{ content:""; }

.nav-toggle{ display:none; background:none; border:none; padding:8px; }
.nav-toggle span{ display:block; width:22px; height:2px; background:var(--ink); margin:5px 0; }

@media (max-width: 880px){
  .nav-toggle{ display:block; }
  .nav-links{
    position:absolute; top:100%; left:0; right:0;
    background: var(--paper-raise);
    border-bottom: 1px solid var(--line);
    flex-direction:column; align-items:stretch;
    padding: 8px 32px 16px;
    display:none;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding: 12px 4px; border-bottom:1px solid var(--line); border-radius:0; }
}

/* ---------------- Hero ---------------- */
.hero{
  position: relative;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-soft) 100%);
  color: var(--text-inv);
  overflow:hidden;
}
.hero .wrap{
  display:grid; grid-template-columns: 1.05fr .95fr; gap: 48px;
  align-items:center;
  padding-top: 88px; padding-bottom: 72px;
  position:relative; z-index:2;
}
.hero .eyebrow{ color: var(--brass-soft); }
.hero .eyebrow::before{ background: var(--brass-soft); }
.hero h1{
  color: #fff;
  font-size: clamp(40px, 5vw, 64px);
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}
.hero h1 em{ font-style:italic; color: var(--brass-soft); }
.hero .lede{
  color: #C4CBDA;
  font-size: 18px;
  max-width: 46ch;
  margin-bottom: 28px;
}
.hero-actions{ display:flex; gap: 12px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 12px 22px; border-radius: 2px;
  font-size:14px; font-weight:600; letter-spacing:.01em;
  border:1px solid transparent; transition: all .15s ease;
}
.btn-primary{ background: var(--brass); color: var(--ink); }
.btn-primary:hover{ background: var(--brass-soft); }
.btn-ghost{ border-color: rgba(255,255,255,.3); color:#fff; }
.btn-ghost:hover{ border-color:#fff; background: rgba(255,255,255,.06); }
.btn-dark{ background: var(--ink); color:#fff; }
.btn-dark:hover{ background: var(--ink-soft); }

.swarm-stage{
  position:relative; aspect-ratio: 1/0.85;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 4px;
  background: radial-gradient(ellipse at 60% 40%, rgba(27,75,107,.4), rgba(15,27,46,0) 70%);
}
#swarmCanvas{ width:100%; height:100%; display:block; }
.swarm-caption{
  position:absolute; bottom:10px; left:12px; right:12px;
  font-family: var(--font-mono); font-size:10.5px; color: rgba(255,255,255,.5);
  display:flex; justify-content:space-between;
}

/* ---------------- Stats strip ---------------- */
.stats-strip{
  border-bottom: 1px solid var(--line);
  background: var(--paper-raise);
}
.stats-grid{
  display:grid; grid-template-columns: repeat(4,1fr);
  padding: 28px 0;
}
.stat{ text-align:center; border-left:1px solid var(--line); padding: 4px 12px; }
.stat:first-child{ border-left:none; }
.stat .num{ font-family: var(--font-mono); font-size: 30px; font-weight:500; color: var(--ink); }
.stat .lbl{ font-size:12.5px; color: var(--slate); text-transform:uppercase; letter-spacing:.06em; margin-top:4px; }
@media (max-width: 700px){ .stats-grid{ grid-template-columns: repeat(2,1fr); row-gap:20px;} .stat:nth-child(3){border-left:none;} }

/* ---------------- Sections ---------------- */
section{ padding: 80px 0; }
.section-head{ display:flex; justify-content:space-between; align-items:flex-end; gap:24px; margin-bottom: 40px; flex-wrap:wrap; }
.section-head h2{ font-size: clamp(28px,3vw,38px); }
.section-head .desc{ max-width:50ch; color:var(--slate); }
.tag-link{ font-family: var(--font-mono); font-size:13px; color: var(--teal); white-space:nowrap; border-bottom:1px solid currentColor; padding-bottom:2px; }
.tag-link:hover{ color: var(--brass); }

.section-alt{ background: var(--paper-raise); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.section-dark{ background: var(--ink); color: var(--text-inv); }
.section-dark h2, .section-dark h3, .section-dark h4{ color:#fff; }
.section-dark p{ color:#B7C0D1; }

/* ---------------- Cards ---------------- */
.card-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 980px){ .card-grid{ grid-template-columns: repeat(2,1fr);} }
@media (max-width: 560px){ .card-grid{ grid-template-columns: 1fr; } }

.research-card{
  background: var(--paper-raise);
  border: 1px solid var(--line);
  padding: 26px 22px;
  border-radius: var(--radius);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.research-card:hover{ transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brass-soft); }
.research-card .idx{ font-family: var(--font-mono); color: var(--brass); font-size:12px; margin-bottom:14px; display:block; }
.research-card h3{ font-size:19px; margin-bottom:8px; }
.research-card p{ font-size:14.5px; margin-bottom:0; }

/* ---------------- People ---------------- */
.pi-card{
  display:grid; grid-template-columns: 260px 1fr; gap: 40px;
  background: var(--paper-raise); border:1px solid var(--line); padding: 36px;
  border-radius: var(--radius);
  align-items:start;
}
@media (max-width: 720px){ .pi-card{ grid-template-columns: 1fr; } }
.pi-photo{ width:100%; aspect-ratio: 4/4.6; object-fit:cover; border-radius:2px; border:1px solid var(--line); }
.pi-card h3{ font-size:26px; margin-bottom:2px; }
.pi-role{ color: var(--brass); font-family: var(--font-mono); font-size:13px; margin-bottom:16px; display:block; }
.pi-links{ display:flex; gap:14px; margin-top:16px; flex-wrap:wrap; }
.pi-links a{ font-size:13.5px; color:var(--teal); border-bottom:1px solid currentColor; padding-bottom:1px; }

.people-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: 26px 24px; margin-top: 44px; }
@media (max-width: 980px){ .people-grid{ grid-template-columns: repeat(3,1fr);} }
@media (max-width: 680px){ .people-grid{ grid-template-columns: repeat(2,1fr);} }
.person{ text-align:left; }
.person .ph{ width:100%; aspect-ratio: 1/1.08; object-fit:cover; border-radius:2px; border:1px solid var(--line); margin-bottom:10px; filter: grayscale(15%); transition: filter .2s ease; }
.person:hover .ph{ filter: grayscale(0%); }
.person .pname{ font-weight:600; color:var(--ink); font-size:15px; }
.person .prole{ font-size:12.5px; color:var(--slate); font-family: var(--font-mono); }

.collab-list{ columns: 3; column-gap: 32px; margin-top: 24px; }
@media (max-width: 780px){ .collab-list{ columns:2; } }
@media (max-width: 520px){ .collab-list{ columns:1; } }
.collab-list li{ font-size:14px; padding: 7px 0; border-bottom: 1px solid var(--line); break-inside: avoid; color: var(--text); }
.collab-list li span{ display:block; font-size:12px; color: var(--slate-light); }

/* ---------------- Publications ---------------- */
.pub-controls{ display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom: 30px; }
.pub-tabs{ display:flex; gap:6px; background:var(--paper-raise); border:1px solid var(--line); padding:4px; border-radius: 3px; }
.pub-tabs button{
  border:none; background:transparent; padding: 9px 16px; font-size:13.5px; font-weight:600;
  color: var(--slate); border-radius:2px;
}
.pub-tabs button.active{ background: var(--ink); color:#fff; }
.pub-search{
  flex:1; min-width:220px;
  border:1px solid var(--line); background:var(--paper-raise);
  padding: 10px 14px; font-size:14px; border-radius:3px; font-family: var(--font-body);
}
.pub-year-filter{ border:1px solid var(--line); background:var(--paper-raise); padding:10px 12px; font-size:13.5px; border-radius:3px; font-family: var(--font-mono); }

.pub-list{ border-top:1px solid var(--line); }
.pub-item{ display:grid; grid-template-columns: 70px 1fr auto; gap:20px; padding: 20px 4px; border-bottom:1px solid var(--line); align-items:start; }
@media (max-width: 700px){ .pub-item{ grid-template-columns: 50px 1fr; } .pub-item .pub-q{ display:none; } }
.pub-year{ font-family: var(--font-mono); color: var(--brass); font-size:15px; padding-top:2px; }
.pub-title{ font-size:15.5px; color: var(--ink); font-weight:600; line-height:1.4; }
.pub-meta{ font-size:13px; color: var(--slate); margin-top:4px; }
.pub-q{ font-family: var(--font-mono); font-size:11px; padding: 3px 9px; border:1px solid var(--line); color: var(--teal); border-radius: 20px; white-space:nowrap; height:fit-content; }
.pub-empty{ padding: 40px 4px; color: var(--slate); font-style:italic; }
.pub-count{ font-family: var(--font-mono); font-size:12.5px; color: var(--slate-light); margin-bottom:10px; }

/* ---------------- Announcements ---------------- */
.timeline{ position:relative; border-left: 1px solid var(--line); padding-left: 32px; margin-left: 6px; }
.tl-item{ position:relative; padding-bottom: 40px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{
  content:""; position:absolute; left:-37.5px; top:4px;
  width:11px; height:11px; border-radius:50%;
  background: var(--paper); border:2px solid var(--brass);
}
.tl-date{ font-family: var(--font-mono); font-size:12.5px; color: var(--brass); letter-spacing:.04em; }
.tl-item h3{ font-size:19px; margin: 6px 0 8px; }
.tl-tag{ display:inline-block; font-family:var(--font-mono); font-size:10.5px; text-transform:uppercase; letter-spacing:.06em; color:var(--teal); border:1px solid var(--line); padding:3px 9px; border-radius:20px; margin-bottom:10px; }

/* ---------------- About ---------------- */
.about-grid{ display:grid; grid-template-columns: 1.3fr .7fr; gap: 56px; }
@media (max-width: 900px){ .about-grid{ grid-template-columns:1fr; } }
.about-body p{ font-size:15.5px; }
.fact-card{ background: var(--paper-raise); border:1px solid var(--line); padding:24px; border-radius: var(--radius); margin-bottom:16px; }
.fact-card h4{ font-size:14px; text-transform:uppercase; letter-spacing:.04em; color:var(--brass); margin-bottom:10px; font-family: var(--font-mono); font-weight:500; }
.fact-card p{ font-size:14px; margin-bottom:0; color: var(--text); }

/* ---------------- Footer ---------------- */
/* footer{ background: var(--ink); color:#B7C0D1; padding: 56px 0 28px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap:40px; margin-bottom:40px; }
@media (max-width: 700px){ .footer-grid{ grid-template-columns:1fr; gap:28px; } }
footer h4{ color:#fff; font-size:13px; text-transform:uppercase; letter-spacing:.06em; font-family: var(--font-mono); font-weight:500; margin-bottom:16px; }
footer a{ display:block; color:#B7C0D1; font-size:14px; padding:5px 0; }
footer a:hover{ color: var(--brass-soft); }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.12); padding-top:24px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:12.5px; color:#7C87A0; } */

footer{ background: var(--ink); color:#B7C0D1; padding: 56px 0 28px; }
.footer-top{ display:flex; justify-content:space-between; align-items:flex-start; gap:32px; margin-bottom:40px; }
.footer-badge{ flex-shrink:0; }
.footer-badge img{ width:72px; height:auto; opacity:.92; }
@media (max-width: 700px){ .footer-top{ flex-direction:column-reverse; align-items:flex-start; gap:20px; } }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap:40px; margin-bottom:0; flex:1; }
@media (max-width: 700px){ .footer-grid{ grid-template-columns:1fr; gap:28px; } }
footer h4{ color:#fff; font-size:13px; text-transform:uppercase; letter-spacing:.06em; font-family: var(--font-mono); font-weight:500; margin-bottom:16px; }
footer a{ display:block; color:#B7C0D1; font-size:14px; padding:5px 0; }
footer a:hover{ color: var(--brass-soft); }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.12); padding-top:24px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:12.5px; color:#7C87A0; }


/* ---------------- Page header (non-home) ---------------- */
.page-hero{ background: var(--ink); color:#fff; padding: 64px 0 48px; }
.page-hero h1{ color:#fff; font-size: clamp(34px,4vw,48px); }
.page-hero p{ color:#C4CBDA; max-width:60ch; margin-top:14px; font-size:16px; }

.divider-dots{ display:flex; gap:6px; margin: 8px 0 28px; }
.divider-dots span{ width:5px; height:5px; border-radius:50%; background: var(--line-dark); opacity:.4; }



.research-row{ display:grid; grid-template-columns: 90px 1fr; gap:28px; padding: 36px 0; border-top:1px solid var(--line); }
@media (max-width: 560px){ .research-row{ grid-template-columns: 1fr; gap:8px; padding: 28px 0; } }



/* ---------------- Banner hero (Internships) ---------------- */
.banner-hero{
  position: relative;
  background-image: linear-gradient(180deg, rgba(15,27,46,.82), rgba(15,27,46,.72)), url('../images/iitr-banner.jpg');
  background-size: cover;
  background-position: center 65%;
  color: #fff;
  padding: 76px 0 56px;
}
.banner-hero h1{ color:#fff; }
.banner-hero p{ color:#DCE1EA; }
.banner-hero .eyebrow{ color: var(--brass-soft); }
.banner-hero .eyebrow::before{ background: var(--brass-soft); }

/* ---------------- Google Form embed ---------------- */

.form-shell{
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px;
  box-shadow: var(--shadow);
}

.form-shell iframe{
  width: 100%;
  min-height: 1200px;
  border: none;
  display:block;
  border-radius: 2px;
}

.form-note{
  display:flex; gap:10px; align-items:flex-start;
  background: #FBF4E4; border:1px solid var(--brass-soft);
  padding: 14px 16px; border-radius: var(--radius);
  font-size: 13.5px; color: var(--ink); margin-bottom: 24px;
}
.form-note strong{ color: var(--brass); }
.area-grid{ display:grid; grid-template-columns: repeat(4,1fr); gap:16px; margin-bottom: 40px; }
@media (max-width: 900px){ .area-grid{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 480px){ .area-grid{ grid-template-columns: 1fr; } }
.area-pill{
  background: var(--paper-raise); border:1px solid var(--line);
  border-radius: var(--radius); padding: 18px 18px;
}
.area-pill .idx{ font-family: var(--font-mono); color: var(--brass); font-size:11.5px; display:block; margin-bottom:8px; }
.area-pill h4{ font-size:15px; margin-bottom:6px; color: var(--ink); }
.area-pill p{ font-size:13px; margin:0; }

.elig-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; }

@media (max-width: 780px){ .elig-grid{ grid-template-columns: 1fr; } }
.elig-list{ background: var(--paper-raise); border:1px solid var(--line); border-radius: var(--radius); padding: 28px 30px; }
.elig-list h4{ font-size:14px; text-transform:uppercase; letter-spacing:.04em; color:var(--brass); margin-bottom:16px; font-family: var(--font-mono); font-weight:500; }
.elig-list li{ display:flex; gap:10px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size:14.5px; color: var(--text); }
.elig-list li:last-child{ border-bottom:none; }
.elig-list li::before{ content:"✓"; color: var(--teal); font-weight:700; flex-shrink:0; }
.elig-list.not li::before{ content:"–"; color: var(--slate-light); }

/* ---------------- Alumni ---------------- */
.alumni-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: 26px 24px; }
@media (max-width: 980px){ .alumni-grid{ grid-template-columns: repeat(3,1fr);} }
@media (max-width: 680px){ .alumni-grid{ grid-template-columns: repeat(2,1fr);} }
@media (max-width: 380px){ .alumni-grid{ grid-template-columns: 1fr; max-width:220px; margin-left:auto; margin-right:auto; } }
.alumnus .ph{ width:100%; aspect-ratio: 1/1.08; object-fit:cover; border-radius:2px; border:1px solid var(--line); margin-bottom:10px; filter: grayscale(15%); transition: filter .2s ease; }
.alumnus:hover .ph{ filter: grayscale(0%); }
.alumnus .pname{ font-weight:600; color:var(--ink); font-size:15px; }
.alumnus .prole{ font-size:12.5px; color:var(--slate); font-family: var(--font-mono); }
.alumnus .pnow{ font-size:12.5px; color: var(--teal); margin-top:2px; }