/* =========================================================
   Most Nilufa Yeasmin — Academic Portfolio
   Palette: deep navy / white / warm gray. Signature motif:
   small reticle/crosshair marks — a nod to keypoint & pose
   estimation, her research subject.
   ========================================================= */

@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{
  --navy: #12213f;
  --navy-2: #1f3a68;
  --ink: #17191d;
  --muted: #626a76;
  --faint: #8a91a0;
  --line: #e4e7ec;
  --paper: #ffffff;
  --paper-alt: #f6f7fa;
  --ring: rgba(18,33,63,0.14);
  --maxw: 880px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',system-ui,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--navy-2); text-decoration:none;}
a:hover{text-decoration:underline; text-underline-offset:3px;}
a:focus-visible, button:focus-visible{outline:2px solid var(--navy-2); outline-offset:3px;}
img{max-width:100%; display:block;}

.serif{font-family:'Fraunces',serif;}
.mono{font-family:'IBM Plex Mono',monospace;}

.wrap{max-width:var(--maxw); margin:0 auto; padding:0 24px;}

/* ---------- Reticle signature mark ---------- */
.reticle{
  width:14px; height:14px; position:relative; flex:none;
  display:inline-block;
}
.reticle::before,.reticle::after{
  content:""; position:absolute; background:var(--navy-2);
}
.reticle::before{ left:6px; top:0; width:2px; height:14px; }
.reticle::after{ top:6px; left:0; width:14px; height:2px; }

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--maxw); margin:0 auto; padding:16px 24px;
  display:flex; align-items:center; justify-content:space-between;
  gap:20px;
}
.brand{
  font-family:'Fraunces',serif; font-weight:600; font-size:1.05rem;
  color:var(--ink); display:flex; align-items:center; gap:10px;
}
.brand:hover{text-decoration:none;}
nav.primary{display:flex; gap:26px; flex-wrap:wrap;}
nav.primary a{
  color:var(--muted); font-size:0.88rem; font-weight:500;
  letter-spacing:.02em; padding:4px 0; border-bottom:2px solid transparent;
}
nav.primary a:hover{color:var(--ink); text-decoration:none;}
nav.primary a.active{color:var(--ink); border-bottom-color:var(--navy-2);}
.nav-toggle{display:none;}

@media (max-width:640px){
  nav.primary{
    position:absolute; top:100%; left:0; right:0; background:var(--paper);
    flex-direction:column; gap:0; border-bottom:1px solid var(--line);
    max-height:0; overflow:hidden; transition:max-height .25s ease;
  }
  nav.primary.open{max-height:400px;}
  nav.primary a{padding:12px 24px; border-bottom:1px solid var(--line);}
  .nav-toggle{
    display:block; background:none; border:1px solid var(--line);
    border-radius:6px; padding:6px 10px; font-size:1rem; cursor:pointer;
  }
}

/* ---------- Hero ---------- */
.hero{padding:64px 0 40px;}
.eyebrow{
  font-family:'IBM Plex Mono',monospace; font-size:.78rem;
  color:var(--navy-2); letter-spacing:.06em; text-transform:uppercase;
  display:flex; align-items:center; gap:10px; margin-bottom:18px;
}
h1.name{
  font-family:'Fraunces',serif; font-weight:600; font-size:2.6rem;
  line-height:1.1; margin:0 0 8px; color:var(--navy);
}
.role-line{color:var(--muted); font-size:1.05rem; margin:0 0 28px;}
.role-line a{color:var(--navy-2);}

.hero-grid{display:flex; gap:36px; align-items:flex-start; flex-wrap:wrap;}
.hero-photo{
  width:168px; height:168px; border-radius:10px; overflow:hidden;
  border:1px solid var(--line); flex:none; box-shadow:0 8px 24px -12px rgba(18,33,63,.35);
}
.hero-photo img{width:100%; height:100%; object-fit:cover;}
.hero-text{flex:1; min-width:280px;}
.hero-text p{color:var(--ink); font-size:1rem; max-width:64ch;}

.contact-grid{
  display:grid; grid-template-columns:auto 1fr; gap:6px 16px;
  margin:22px 0 18px; font-size:.92rem;
}
.contact-grid dt{color:var(--faint); font-family:'IBM Plex Mono',monospace; font-size:.78rem; text-transform:uppercase; letter-spacing:.05em; padding-top:2px;}
.contact-grid dd{margin:0; color:var(--ink);}

.social-row{display:flex; gap:16px; flex-wrap:wrap; margin-top:16px;}
.social-row a{
  font-size:.82rem; color:var(--navy-2); border:1px solid var(--line);
  padding:6px 12px; border-radius:20px; font-weight:500;
}
.social-row a:hover{background:var(--paper-alt); text-decoration:none;}

/* ---------- Section shell ---------- */
section{padding:44px 0;}
section + section{border-top:1px solid var(--line);}
.section-head{display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin-bottom:26px; flex-wrap:wrap;}
h2.section-title{
  font-family:'Fraunces',serif; font-weight:600; font-size:1.5rem; margin:0;
  color:var(--navy); display:flex; align-items:center; gap:10px;
}
.section-link{font-size:.85rem; color:var(--navy-2); font-weight:500; white-space:nowrap;}

/* ---------- At a glance stats ---------- */
.stats-row{display:flex; gap:0; flex-wrap:wrap; border:1px solid var(--line); border-radius:10px; overflow:hidden;}
.stat{flex:1; min-width:120px; padding:20px 22px; text-align:left; border-right:1px solid var(--line);}
.stat:last-child{border-right:none;}
.stat .num{font-family:'Fraunces',serif; font-weight:600; font-size:2rem; color:var(--navy);}
.stat .label{color:var(--muted); font-size:.82rem; margin-top:4px;}
.stats-note{color:var(--faint); font-size:.78rem; margin-top:10px;}

/* ---------- Research interests grid ---------- */
.interests-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:10px; overflow:hidden;}
.interest-card{background:var(--paper); padding:20px 22px;}
.interest-card .idx{font-family:'IBM Plex Mono',monospace; font-size:.75rem; color:var(--navy-2); display:block; margin-bottom:8px;}
.interest-card h3{font-family:'Fraunces',serif; font-size:1rem; font-weight:600; margin:0 0 6px; color:var(--ink);}
.interest-card p{margin:0; color:var(--muted); font-size:.88rem;}

/* ---------- News / timeline ---------- */
.news-list{list-style:none; margin:0; padding:0; border-left:2px solid var(--line); }
.news-item{position:relative; padding:0 0 26px 26px;}
.news-item::before{
  content:""; position:absolute; left:-7px; top:5px; width:12px; height:12px;
  border-radius:50%; background:var(--paper); border:2px solid var(--navy-2);
}
.news-date{font-family:'IBM Plex Mono',monospace; font-size:.76rem; color:var(--faint); text-transform:uppercase; letter-spacing:.04em;}
.news-tag{
  display:inline-block; font-size:.72rem; font-weight:600; color:var(--navy-2);
  border:1px solid var(--navy-2); border-radius:20px; padding:1px 9px; margin:6px 6px 6px 0;
}
.news-item p{margin:6px 0 0; color:var(--ink);}
.news-links{margin-top:6px; font-size:.85rem; display:flex; gap:14px;}

/* ---------- Publications ---------- */
.pub-list{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:26px;}
.pub-item{padding-bottom:26px; border-bottom:1px solid var(--line);}
.pub-list .pub-item:last-child{border-bottom:none; padding-bottom:0;}
.pub-year{font-family:'IBM Plex Mono',monospace; color:var(--navy-2); font-size:.8rem; margin-bottom:6px; display:block;}
.pub-title{font-family:'Fraunces',serif; font-weight:600; font-size:1.08rem; margin:0 0 6px; color:var(--ink); line-height:1.35;}
.pub-authors{color:var(--muted); font-size:.9rem; margin:0 0 4px;}
.pub-authors .me{color:var(--ink); font-weight:600;}
.pub-venue{color:var(--muted); font-size:.88rem; font-style:italic; margin:0 0 8px;}
.pub-links{display:flex; gap:14px; flex-wrap:wrap; font-size:.85rem; font-weight:500;}

/* ---------- Projects ---------- */
.project-list{display:flex; flex-direction:column; gap:0;}
.project-item{padding:26px 0; border-bottom:1px solid var(--line);}
.project-list .project-item:last-child{border-bottom:none;}
.project-top{display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; align-items:baseline;}
.project-title{font-family:'Fraunces',serif; font-weight:600; font-size:1.15rem; margin:0; color:var(--ink);}
.project-dates{font-family:'IBM Plex Mono',monospace; font-size:.78rem; color:var(--faint); white-space:nowrap;}
.project-tags{margin:8px 0 10px; font-size:.82rem; color:var(--navy-2);}
.project-item ul{margin:8px 0 0; padding-left:20px; color:var(--ink); font-size:.94rem;}
.project-item li{margin-bottom:4px;}

/* ---------- Service / Awards lists ---------- */
.plain-list{list-style:none; margin:0; padding:0; display:flex; flex-direction:column;}
.plain-list li{
  display:flex; gap:18px; padding:14px 0; border-bottom:1px solid var(--line);
  align-items:baseline; flex-wrap:wrap;
}
.plain-list li:last-child{border-bottom:none;}
.plain-list .when{font-family:'IBM Plex Mono',monospace; font-size:.78rem; color:var(--navy-2); min-width:96px; flex:none;}
.plain-list .what{color:var(--ink); font-size:.95rem;}
.plain-list .what .org{color:var(--muted); font-size:.88rem; display:block; margin-top:2px;}

/* ---------- Gallery ---------- */
.gallery-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px;}
.gallery-grid figure{margin:0; border:1px solid var(--line); border-radius:10px; overflow:hidden; background:var(--paper-alt);}
.gallery-grid img{width:100%; height:240px; object-fit:cover;}
.gallery-grid figcaption{padding:10px 14px; font-size:.82rem; color:var(--muted);}
.gallery-empty{
  border:1px dashed var(--line); border-radius:10px; padding:40px 24px; text-align:center;
  color:var(--faint); font-size:.9rem;
}

/* ---------- Biography ---------- */
.bio p{max-width:70ch; color:var(--ink);}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--line); padding:32px 0 48px; color:var(--faint); font-size:.82rem;}
.footer-inner{display:flex; justify-content:space-between; align-items:center; gap:16px; flex-wrap:wrap;}
.footer-social{display:flex; gap:14px;}
.footer-social a{color:var(--faint);}
.footer-social a:hover{color:var(--navy-2);}

/* ---------- Page header (sub-pages) ---------- */
.page-head{padding:48px 0 8px;}
.page-head h1{font-family:'Fraunces',serif; font-weight:600; font-size:2rem; color:var(--navy); margin:0 0 8px; display:flex; align-items:center; gap:12px;}
.page-head p{color:var(--muted); margin:0 0 8px; max-width:60ch;}

@media (max-width:640px){
  h1.name{font-size:2rem;}
  .hero{padding:44px 0 28px;}
  .stats-row{flex-direction:column;}
  .stat{border-right:none; border-bottom:1px solid var(--line);}
  .stat:last-child{border-bottom:none;}
}

.reduced-motion, .no-anim{transition:none !important; animation:none !important;}
@media (prefers-reduced-motion: reduce){
  *{animation:none !important; transition:none !important; scroll-behavior:auto !important;}
}