/* =========================================================
   Tejaram Chaudhari — portfolio
   Aesthetic: refined dark, editorial-technical (Newsreader +
   Hanken Grotesk + JetBrains Mono), near-monochrome with a
   single cool accent. Apple/Linear/Vercel restraint.
   ========================================================= */

:root{
  --bg:#0a0b0d;
  --bg-2:#101216;
  --bg-3:#15181e;
  --ink:#eef1f4;
  --muted:#97a1ad;
  --faint:#5d6673;
  --line:#1d222b;
  --line-2:#272d38;
  --accent:#7fb4ff;          /* cool signal blue */
  --accent-dim:#2c4566;
  --accent-soft:rgba(127,180,255,.10);
  --radius:14px;
  --maxw:1080px;
  --ease:cubic-bezier(.22,.7,.2,1);
  --serif:"Newsreader",Georgia,serif;
  --sans:"Hanken Grotesk",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);line-height:1.65;font-size:16px;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{ /* atmosphere */
  content:"";position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(1000px 560px at 82% -8%, rgba(127,180,255,.06), transparent 60%),
    radial-gradient(800px 600px at -8% 12%, rgba(127,180,255,.035), transparent 55%),
    var(--bg);
}
body::after{ /* grain */
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.03;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{margin:0;font-weight:500}
.container{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.mono{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase}
.muted{color:var(--muted)}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#04101f;padding:10px 16px;z-index:200;border-radius:0 0 8px 0}
.skip:focus{left:0}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}

/* ---------- reading progress ---------- */
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--accent);z-index:120;transition:width .1s linear}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:100;backdrop-filter:saturate(140%) blur(12px);
  background:rgba(10,11,13,.66);border-bottom:1px solid transparent;transition:border-color .3s,background .3s}
.nav.scrolled{border-bottom-color:var(--line);background:rgba(10,11,13,.82)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:14px 32px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600}
.brand-mark{font-family:var(--mono);font-size:.8rem;border:1px solid var(--line-2);border-radius:7px;padding:4px 7px;color:var(--accent)}
.brand-name{font-size:.95rem;letter-spacing:-.01em}
.nav-links{margin-left:auto;display:flex;gap:26px}
.nav-links a{font-size:.9rem;color:var(--muted);position:relative;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background:var(--accent);border-radius:2px}
.nav-actions{display:flex;align-items:center;gap:12px}
.cmdk-hint{display:flex;align-items:center;gap:6px;background:var(--bg-2);border:1px solid var(--line);
  color:var(--muted);font-family:var(--sans);font-size:.8rem;padding:6px 10px;border-radius:9px;cursor:pointer;transition:border-color .2s,color .2s}
.cmdk-hint:hover{border-color:var(--accent-dim);color:var(--ink)}
.cmdk-hint kbd{font-family:var(--mono);font-size:.68rem;background:var(--bg-3);border:1px solid var(--line-2);border-radius:5px;padding:1px 5px}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.menu-toggle span{width:22px;height:2px;background:var(--ink);transition:transform .3s,opacity .3s}
.menu-toggle[aria-expanded="true"] span:first-child{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:last-child{transform:translateY(-0px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{font-family:var(--mono);font-size:.78rem;letter-spacing:.03em;border:1px solid var(--line-2);
  background:var(--bg-2);padding:11px 17px;border-radius:10px;transition:border-color .25s,color .25s,transform .25s,background .25s}
.btn:hover{border-color:var(--accent-dim);color:var(--accent);transform:translateY(-2px)}
.btn.primary{border-color:var(--accent-dim);color:var(--accent);background:var(--accent-soft)}
.btn.primary:hover{background:rgba(127,180,255,.16)}

/* ---------- hero ---------- */
.hero{padding:90px 0 60px}
.hero-grid{display:grid;grid-template-columns:1.4fr .9fr;gap:56px;align-items:center}
.kick{color:var(--accent);font-family:var(--mono);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;margin:0 0 22px}
.hero h1{font-family:var(--serif);font-size:clamp(3rem,8.5vw,6rem);line-height:.95;letter-spacing:-.02em;font-weight:500}
.hero h1 .dot{color:var(--accent)}
.hero-line{font-size:1.18rem;color:var(--muted);max-width:42ch;margin:26px 0 0}
.hero-line em{color:var(--ink);font-family:var(--serif);font-style:italic}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.hero-tags span{font-family:var(--mono);font-size:.72rem;color:#c4cdd8;border:1px solid var(--line);border-radius:999px;padding:5px 11px}
.hero-cta{display:flex;flex-wrap:wrap;gap:11px;margin-top:30px}

.hero-portrait{display:flex;flex-direction:column;gap:14px;align-items:center}
.portrait{position:relative;width:230px;height:280px;border-radius:18px;overflow:hidden;
  background:linear-gradient(160deg,var(--bg-3),var(--bg-2));border:1px solid var(--line-2);
  display:grid;place-items:center}
.portrait img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.portrait .monogram{font-family:var(--serif);font-size:5rem;color:var(--accent);opacity:.85}
.portrait::after{content:"";position:absolute;inset:0;box-shadow:inset 0 -60px 60px -30px rgba(0,0,0,.6)}
.portrait-meta{display:flex;gap:18px;color:var(--faint)}
.portrait-meta .mono{font-size:.68rem}

/* ---------- sections ---------- */
.section{padding:74px 0;border-top:1px solid var(--line)}
.section.alt{background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:14px}
.idx{font-family:var(--mono);font-size:.72rem;color:var(--faint);letter-spacing:.16em}
.sec-head h2{font-family:var(--serif);font-size:2rem;letter-spacing:-.01em}
.sec-intro{color:var(--muted);max-width:60ch;margin:0 0 34px}

/* about */
.about-grid{display:grid;grid-template-columns:1.5fr .9fr;gap:48px;margin-top:24px}
.about-grid p{color:var(--muted);margin:0 0 16px;max-width:60ch}
.about-grid .lead{font-size:1.12rem;color:var(--ink)}
.about-grid em{color:var(--ink);font-family:var(--serif);font-style:italic}
.about-grid strong{color:var(--ink)}
.about-card{align-self:start;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-2);padding:6px 20px}
.ac-row{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.ac-row.last{border-bottom:0}
.ac-row .mono{color:var(--faint)}
.ac-row span:last-child{color:var(--ink);font-size:.92rem;text-align:right}

/* research / papers */
.papers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.paper{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-2);padding:22px;position:relative;transition:border-color .25s,transform .25s}
.paper:hover{border-color:var(--accent-dim);transform:translateY(-3px)}
.paper-tag{color:var(--accent);margin-bottom:12px}
.paper h3{font-family:var(--serif);font-size:1.2rem;margin-bottom:8px;line-height:1.2}
.authors{color:var(--ink);font-size:.9rem;margin:0 0 2px}
.venue{color:var(--faint);margin:0 0 12px}
.abstract{color:var(--muted);font-size:.92rem;margin:0 0 16px}
.paper-links{display:flex;gap:14px}
.paper-links a{font-family:var(--mono);font-size:.74rem;color:var(--muted);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.paper-links a:hover{color:var(--accent);border-color:var(--accent-dim)}

/* filters */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px}
.filter{font-family:var(--mono);font-size:.76rem;color:var(--muted);background:var(--bg-2);border:1px solid var(--line);
  padding:8px 15px;border-radius:999px;cursor:pointer;transition:all .2s}
.filter:hover{border-color:var(--accent-dim);color:var(--ink)}
.filter.active{background:var(--accent-soft);border-color:var(--accent-dim);color:var(--accent)}

/* generic grid + cards */
.grid{display:grid;gap:18px}
.projects-grid{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-2);overflow:hidden;
  display:flex;flex-direction:column;transition:border-color .25s,transform .25s,opacity .35s}
.card:hover{border-color:var(--accent-dim);transform:translateY(-3px)}
.project.hide{display:none}
.thumb{height:140px;background:
    linear-gradient(135deg,#161a21,#0d0f13);
  display:grid;place-items:center;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.thumb::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(circle at 1px 1px, rgba(127,180,255,.18) 1px, transparent 0);background-size:18px 18px;opacity:.5}
.thumb::after{content:attr(data-glyph);position:relative;font-family:var(--serif);font-size:2.6rem;color:var(--accent);opacity:.8}
.card-body{padding:20px 22px;display:flex;flex-direction:column;gap:12px;flex:1}
.card-top{display:flex;justify-content:space-between;align-items:baseline;gap:14px}
.card-top h3{font-family:var(--serif);font-size:1.18rem;line-height:1.2}
.metric{color:var(--accent);white-space:nowrap}
.card-body p{color:var(--muted);font-size:.93rem;margin:0}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:7px;padding:0;margin:0}
.chips li{font-family:var(--mono);font-size:.68rem;color:#c4cdd8;border:1px solid var(--line);border-radius:6px;padding:4px 8px}
.card-links{display:flex;gap:16px;margin-top:auto;padding-top:6px}
.card-links a{font-family:var(--mono);font-size:.74rem;color:var(--muted);transition:color .2s}
.card-links a:hover{color:var(--accent)}

/* timeline */
.timeline{list-style:none;margin:24px 0 0;padding:0 0 0 22px;position:relative}
.timeline::before{content:"";position:absolute;left:4px;top:6px;bottom:6px;width:2px;background:var(--line-2)}
.timeline li{position:relative;padding:0 0 30px 30px}
.timeline li::before{content:"";position:absolute;left:-22px;top:6px;width:10px;height:10px;border-radius:50%;
  background:var(--bg);border:2px solid var(--accent);box-shadow:0 0 0 4px var(--bg)}
.t-year{color:var(--accent);display:block;margin-bottom:4px}
.t-body h3{font-family:var(--serif);font-size:1.18rem}
.t-body p{color:var(--muted);font-size:.93rem;margin:4px 0 0;max-width:60ch}

/* awards + leadership */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.award-list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:14px}
.award-list li{display:flex;gap:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-2);padding:18px 20px;transition:border-color .25s,transform .25s}
.award-list li:hover{border-color:var(--accent-dim);transform:translateY(-2px)}
.aw-glyph{color:var(--accent);font-size:1rem;line-height:1.6}
.award-list h3{font-family:var(--serif);font-size:1.1rem}
.award-list p{color:var(--muted);font-size:.9rem;margin:4px 0 0}

/* skills */
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
.skill-group{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-2);padding:20px;transition:border-color .25s,opacity .25s}
.skills-grid:hover .skill-group{opacity:.5}
.skills-grid .skill-group:hover{opacity:1;border-color:var(--accent-dim)}
.skill-group h3{color:var(--accent);margin-bottom:14px}
.skill-group ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.skill-group li{font-size:.86rem;color:#cdd6df;border:1px solid var(--line);border-radius:7px;padding:6px 11px;transition:border-color .2s,color .2s}
.skill-group li:hover{border-color:var(--accent-dim);color:var(--accent)}

/* writing */
.writing-grid{grid-template-columns:repeat(3,1fr)}
.writing .card-body{gap:8px}
.writing h3{font-family:var(--serif);font-size:1.12rem;line-height:1.25}

/* contact */
.contact-line{font-size:1.15rem;color:var(--ink);max-width:50ch;margin:6px 0 26px}
.contact-links{display:grid;gap:2px;max-width:560px}
.contact-links a{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:16px 4px;border-bottom:1px solid var(--line);transition:padding .25s,color .25s}
.contact-links a:hover{padding-left:14px;color:var(--accent)}
.contact-links a .mono{color:var(--faint);min-width:90px}
.contact-links a:hover .mono{color:var(--accent)}

/* footer */
.footer{border-top:1px solid var(--line);padding:34px 0}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--faint)}

/* ---------- command palette ---------- */
.cmdk{position:fixed;inset:0;z-index:300;display:none}
.cmdk.open{display:block}
.cmdk-backdrop{position:absolute;inset:0;background:rgba(4,5,7,.6);backdrop-filter:blur(4px)}
.cmdk-panel{position:relative;max-width:560px;margin:12vh auto 0;background:var(--bg-2);border:1px solid var(--line-2);
  border-radius:16px;box-shadow:0 30px 80px -20px rgba(0,0,0,.7);overflow:hidden;animation:pop .18s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateY(-8px) scale(.99)}to{opacity:1;transform:none}}
#cmdkInput{width:100%;border:0;background:transparent;color:var(--ink);font-family:var(--sans);font-size:1.05rem;padding:18px 20px;outline:none;border-bottom:1px solid var(--line)}
.cmdk-list{list-style:none;margin:0;padding:8px;max-height:46vh;overflow:auto}
.cmdk-list li{padding:11px 14px;border-radius:9px;display:flex;justify-content:space-between;gap:12px;cursor:pointer;color:var(--muted)}
.cmdk-list li .k{font-family:var(--mono);font-size:.68rem;color:var(--faint)}
.cmdk-list li.active,.cmdk-list li:hover{background:var(--accent-soft);color:var(--ink)}
.cmdk-foot{display:flex;gap:10px;padding:10px 16px;border-top:1px solid var(--line);color:var(--faint)}
.cmdk-foot kbd{font-family:var(--mono);background:var(--bg-3);border:1px solid var(--line-2);border-radius:5px;padding:1px 6px;font-size:.66rem}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}

/* ---------- responsive ---------- */
@media (max-width:860px){
  .nav-links{position:fixed;inset:62px 0 auto 0;flex-direction:column;gap:0;background:var(--bg-2);
    border-bottom:1px solid var(--line);padding:8px 0;transform:translateY(-130%);transition:transform .3s var(--ease)}
  .nav-links.open{transform:none}
  .nav-links a{padding:14px 32px}
  .nav-links a.active::after{display:none}
  .menu-toggle{display:flex}
  .cmdk-hint span{display:none}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-portrait{order:-1;align-items:flex-start}
  .about-grid,.two-col{grid-template-columns:1fr;gap:28px}
  .papers,.skills-grid,.writing-grid,.projects-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .container,.nav-inner{padding-left:20px;padding-right:20px}
  .section{padding:54px 0}
  .hero{padding:60px 0 40px}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto !important}
  .reveal{opacity:1 !important;transform:none !important;transition:none}
  .btn:hover,.card:hover,.paper:hover,.award-list li:hover{transform:none}
  .cmdk-panel{animation:none}
}