/* ==========================================================================
   Dr. Mohit Seth — Nuclear Medicine & Theranostics
   style.css  ·  single stylesheet, expandable to a full site
   Palette: deep clinical teal + isotope amber on warm paper
   Type: Newsreader (display) · IBM Plex Sans (body) · IBM Plex Mono (labels)
   ========================================================================== */

/* ---- Design tokens ---- */
:root{
  --bg:#f7f7f1;
  --surface:#ffffff;
  --surface-2:#eef1eb;
  --ink:#14201f;
  --muted:#55635f;
  --line:#e2e4dc;
  --primary:#0e3b39;
  --primary-hover:#0c6559;
  --on-primary:#ffffff;      /* text/icon colour that sits ON --primary */
  --accent:#12897c;
  --accent-ink:#0c6559;
  --accent-soft:#e2efeb;
  --iso:#8a5a12;             /* AA-compliant on light ground */
  --iso-soft:#f6ecdb;
  --shadow-sm:0 1px 2px rgba(20,32,31,.05),0 4px 14px rgba(20,32,31,.05);
  --shadow-md:0 2px 6px rgba(20,32,31,.06),0 16px 40px rgba(20,32,31,.09);
  --radius:14px;
  --radius-sm:10px;
  --maxw:1080px;
  --nav-h:66px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0b1110;
    --surface:#121b19;
    --surface-2:#182220;
    --ink:#e7ece9;
    --muted:#94a19d;
    --line:#26302d;
    --primary:#7bd9ca;
    --primary-hover:#a8e8dc;
    --on-primary:#06201d;
    --accent:#3db8a9;
    --accent-ink:#8fe0d2;
    --accent-soft:#15302c;
    --iso:#e0a352;
    --iso-soft:#2a2013;
    --shadow-sm:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.25);
    --shadow-md:0 2px 8px rgba(0,0,0,.35),0 18px 44px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --bg:#0b1110;--surface:#121b19;--surface-2:#182220;--ink:#e7ece9;--muted:#94a19d;
  --line:#26302d;--primary:#7bd9ca;--primary-hover:#a8e8dc;--on-primary:#06201d;
  --accent:#3db8a9;--accent-ink:#8fe0d2;
  --accent-soft:#15302c;--iso:#e0a352;--iso-soft:#2a2013;
  --shadow-sm:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.25);
  --shadow-md:0 2px 8px rgba(0,0,0,.35),0 18px 44px rgba(0,0,0,.4);
}

/* ---- Reset & base ---- */
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,sans-serif;
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--accent-ink);text-decoration:none}
a:hover{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
h1,h2,h3,h4{font-family:"Newsreader",Georgia,serif;font-weight:500;line-height:1.12;letter-spacing:-.01em;color:var(--ink);text-wrap:balance;margin:0}
p{margin:0 0 1rem}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{
  font-family:"IBM Plex Mono",ui-monospace,monospace;font-size:12px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--accent-ink);
}
.section{padding:72px 0;border-top:1px solid var(--line)}
.section-head{margin-bottom:34px;max-width:60ch}
.section-head h2{font-size:clamp(26px,4vw,36px);margin:.3em 0 .25em}
.section-head p{color:var(--muted);margin:0}

/* ---- Buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:9px;font-family:"IBM Plex Sans",sans-serif;
  font-weight:600;font-size:15px;padding:12px 20px;border-radius:999px;cursor:pointer;
  border:1.5px solid transparent;transition:transform .12s ease,background .15s ease,box-shadow .15s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{background:var(--primary);color:var(--on-primary);box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--primary-hover);color:var(--on-primary)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent-ink)}

/* ---- Header / nav ---- */
.site-header{
  position:sticky;top:0;z-index:50;height:var(--nav-h);
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.brand{display:flex;align-items:center;gap:11px;font-weight:600;color:var(--ink)}
.brand .mark{
  width:34px;height:34px;border-radius:9px;flex:none;display:grid;place-items:center;
  background:var(--primary);color:var(--on-primary);
  font-family:"IBM Plex Mono",monospace;font-weight:700;font-size:14px;
}
.brand .b-name{font-family:"Newsreader",serif;font-size:18px;line-height:1}
.brand .b-sub{display:block;font-family:"IBM Plex Mono",monospace;font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:3px}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0}
/* :not(.btn) so these never override the CTA button's own colours */
.nav-links a:not(.btn){color:var(--muted);font-size:14.5px;font-weight:500}
.nav-links a:not(.btn):hover{color:var(--ink)}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:9px;padding:8px;cursor:pointer;color:var(--ink)}
.nav-toggle svg{width:20px;height:20px}
/* current section indicator */
.nav-links a.active{color:var(--ink);font-weight:600}
.nav-links a.active::after{
  content:"";display:block;height:2px;border-radius:2px;background:var(--accent);
  margin-top:3px;
}

/* Skip link — keyboard users land here first */
.skip-link{
  position:absolute;left:16px;top:-60px;z-index:100;background:var(--primary);
  color:var(--on-primary);padding:10px 18px;border-radius:0 0 10px 10px;font-weight:600;
  transition:top .18s ease;
}
.skip-link:focus{top:0;color:var(--on-primary)}

/* ---- Hero ---- */
.hero{padding:56px 0 64px}
.hero-grid{display:grid;grid-template-columns:1.35fr .9fr;gap:52px;align-items:center}
.hero-status{
  display:inline-flex;align-items:center;gap:8px;font-family:"IBM Plex Mono",monospace;
  font-size:12px;letter-spacing:.05em;color:var(--accent-ink);background:var(--accent-soft);
  padding:6px 12px;border-radius:999px;margin-bottom:20px;
}
.hero-status .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.hero h1{font-size:clamp(38px,6vw,60px);margin-bottom:14px}
.hero .role{font-family:"IBM Plex Mono",monospace;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--iso);margin-bottom:20px}
.hero .tagline{font-size:20px;color:var(--muted);max-width:46ch;margin-bottom:14px}
.hero .meta{display:flex;flex-wrap:wrap;gap:18px;color:var(--muted);font-size:14.5px;margin-bottom:28px}
.hero .meta span{display:inline-flex;align-items:center;gap:7px}
.hero .meta svg{width:16px;height:16px;color:var(--accent)}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.portrait{position:relative;justify-self:center}
.portrait img{
  width:300px;height:300px;object-fit:cover;border-radius:20px;
  box-shadow:var(--shadow-md);border:1px solid var(--line);
}
.portrait::after{
  content:"";position:absolute;inset:auto -14px -14px auto;width:110px;height:110px;
  border-radius:18px;background:
    radial-gradient(circle at 30% 30%,var(--accent) 0,transparent 60%),
    radial-gradient(circle at 70% 70%,var(--iso) 0,transparent 55%);
  opacity:.16;z-index:-1;
}

/* ---- Stat band ---- */
.stat-band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:0}
.stat{padding:26px 20px;text-align:center;border-left:1px solid var(--line)}
.stat:first-child{border-left:0}
.stat .num{font-family:"Newsreader",serif;font-weight:500;font-size:clamp(28px,4vw,40px);color:var(--primary);line-height:1;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat .lab{display:block;margin-top:9px;font-size:12.5px;color:var(--muted);line-height:1.4}
.stat .lab b{color:var(--ink);font-weight:600;display:block;font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.06em}

/* ---- About ---- */
.about-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:44px;align-items:start}
.about-lead{font-family:"Newsreader",serif;font-size:22px;line-height:1.45;color:var(--ink);margin-bottom:18px}
.about-grid p{color:var(--muted);max-width:62ch}
.focus-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow-sm)}
.focus-card h3{font-size:16px;font-family:"IBM Plex Sans",sans-serif;font-weight:600;margin-bottom:12px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-family:"IBM Plex Mono",monospace;font-size:12px;padding:5px 11px;border-radius:999px;background:var(--surface-2);color:var(--ink);border:1px solid var(--line)}

/* ---- Expertise ---- */
.exp-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.exp-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.exp-card .icon{width:40px;height:40px;border-radius:11px;background:var(--accent-soft);color:var(--accent-ink);display:grid;place-items:center;margin-bottom:14px}
.exp-card .icon svg{width:21px;height:21px}
.exp-card h3{font-size:17px;margin-bottom:8px}
.exp-card ul{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.exp-card li{position:relative;padding-left:18px;font-size:14px;color:var(--muted)}
.exp-card li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.exp-card li b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}

/* ---- Research / list blocks ---- */
.research-list,.award-list{display:flex;flex-direction:column;gap:14px}
.item{
  background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:var(--radius-sm);padding:20px 22px;box-shadow:var(--shadow-sm);
}
.item .kicker{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--iso);margin-bottom:7px;display:flex;align-items:center;gap:10px}
.item .kicker .status{background:var(--iso-soft);color:var(--iso);padding:2px 8px;border-radius:5px;font-size:10px}
.item h3{font-size:17px;line-height:1.3;margin-bottom:6px}
.item p{margin:0;color:var(--muted);font-size:14px}
.item .authors{font-style:italic}

/* two-column awards */
.award-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.badge-item{display:flex;gap:13px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px;box-shadow:var(--shadow-sm)}
.badge-item .b-ico{flex:none;width:34px;height:34px;border-radius:9px;background:var(--iso-soft);color:var(--iso);display:grid;place-items:center}
.badge-item .b-ico svg{width:18px;height:18px}
.badge-item h4{font-family:"IBM Plex Sans",sans-serif;font-weight:600;font-size:14.5px;margin:0 0 3px}
.badge-item p{margin:0;font-size:13px;color:var(--muted)}

/* ---- Credentials timeline ---- */
.cred-list{display:flex;flex-direction:column}
.cred{display:grid;grid-template-columns:150px 1fr;gap:26px;padding:20px 0;border-top:1px solid var(--line)}
.cred:first-child{border-top:0}
.cred .when{font-family:"IBM Plex Mono",monospace;font-size:13px;color:var(--accent-ink);font-weight:500}
.cred h3{font-size:17px;margin-bottom:4px}
.cred p{margin:0;color:var(--muted);font-size:14px}
.cred .reg{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted);margin-top:5px}

/* ---- Contact ---- */
.contact{background:var(--surface);border-top:1px solid var(--line)}
.contact-card{
  background:linear-gradient(135deg,var(--primary),var(--accent-ink));
  border-radius:20px;padding:48px;color:#fff;text-align:center;box-shadow:var(--shadow-md);
}
.contact-card h2{color:#fff;font-size:clamp(26px,4vw,34px);margin-bottom:12px}
.contact-card p{color:rgba(255,255,255,.82);max-width:48ch;margin:0 auto 26px}
.contact-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.contact-actions .btn{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.25);backdrop-filter:blur(4px)}
.contact-actions .btn:hover{background:#fff;color:var(--primary);border-color:#fff}
.contact-actions .btn svg{width:18px;height:18px}

/* ---- Footer ---- */
.site-footer{padding:34px 0;border-top:1px solid var(--line);background:var(--bg)}
.footer-in{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.footer-in p{margin:0;font-size:13px;color:var(--muted)}
.footer-links{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.footer-links a{color:var(--muted);font-size:13px}
.footer-links a:hover{color:var(--accent-ink)}

/* ---- Reveal (from a visible resting state) ---- */
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
  .reveal.in{opacity:1;transform:none}
}

/* ---- Responsive ---- */
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .portrait{order:-1;justify-self:start}
  .portrait img{width:180px;height:180px;border-radius:16px}
  .about-grid{grid-template-columns:1fr;gap:26px}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .stat{border-left:0;border-top:1px solid var(--line);text-align:left}
  .stat:first-child,.stat:nth-child(2){border-top:0}
  .award-grid{grid-template-columns:1fr}
  .nav-links{
    position:fixed;inset:var(--nav-h) 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);padding:8px 24px 18px;
    transform:translateY(-120%);transition:transform .25s ease;box-shadow:var(--shadow-md);
  }
  .nav-links.open{transform:none}
  .nav-links li{border-top:1px solid var(--line)}
  .nav-links li:first-child{border-top:0}
  .nav-links a:not(.btn){display:block;padding:13px 2px;font-size:16px}
  .nav-links .nav-cta{margin:12px 0 0}
  .nav-links .nav-cta .btn{width:100%;justify-content:center}
  .nav-toggle{display:inline-flex}
  .cred{grid-template-columns:1fr;gap:4px}
  .contact-card{padding:34px 22px}
  .section{padding:56px 0}
}
@media (max-width:420px){
  .stat-grid{grid-template-columns:1fr}
  .stat{border-top:1px solid var(--line)!important}
  .stat:first-child{border-top:0!important}
}

/* ---- Print: hiring committees print and PDF these pages ---- */
@media print{
  :root{
    --bg:#fff;--surface:#fff;--surface-2:#fff;--ink:#000;--muted:#333;
    --line:#bbb;--primary:#0e3b39;--on-primary:#fff;--accent:#0e3b39;--accent-ink:#0e3b39;
    --accent-soft:#eee;--iso:#6b4610;--iso-soft:#f2f2f2;
    --shadow-sm:none;--shadow-md:none;
  }
  @page{margin:14mm}
  body{background:#fff;color:#000;font-size:10.5pt;line-height:1.4}
  .site-header,.nav-toggle,.hero-cta,.skip-link,.hero-status{display:none!important}
  /* keep contact details on paper, but as plain text not buttons */
  .contact-actions{display:block;text-align:center}
  .contact-actions .btn{
    display:inline;background:none!important;border:0;color:#000!important;
    padding:0;margin:0 10pt;font-weight:600;
  }
  .contact-actions .btn svg{display:none}
  .reveal{opacity:1!important;transform:none!important}
  a{color:#000;text-decoration:none}
  /* show link targets so a printed copy is still actionable */
  .footer-links a::after{content:" (" attr(href) ")";font-size:8pt;color:#555}
  .section,.hero{padding:14pt 0;break-inside:avoid}
  .exp-card,.item,.badge-item,.focus-card,.stat{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .contact-card{background:#fff!important;color:#000!important;border:1.5pt solid #0e3b39;padding:16pt}
  .contact-card h2,.contact-card p{color:#000!important}
  .portrait img{width:120px;height:120px}
  h1{font-size:24pt}
  h2{font-size:14pt}
  .stat .num{font-size:18pt}
}