:root{
  --bg:#ffffff; --soft:#f4f7fc; --ink:#0e1a33; --tx:#0e1a33; --tx2:#34425f; --mut:#5d6b87;
  --cy:#1d4ed8; --vi:#4f46e5; --am:#b45309; --gr:#0f9d6a; --warm:#d9480f;
  --line:#dfe6f2; --card:#ffffff; --sh:0 16px 36px -24px rgba(17,38,86,.38);
  --r:18px; --font:'Space Grotesk',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif; --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
  --serif:'Newsreader','Hind Siliguri',Georgia,serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{background:var(--bg);color:var(--tx);font-family:var(--font);line-height:1.65;overflow-x:hidden;-webkit-tap-highlight-color:transparent;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;touch-action:manipulation}
.mono{font-family:var(--mono)}
#bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.grid-bg{position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(900px 500px at 85% -5%,rgba(29,78,216,.07),transparent 65%),radial-gradient(800px 500px at -5% 45%,rgba(79,70,229,.05),transparent 60%),linear-gradient(rgba(29,78,216,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(29,78,216,.045) 1px,transparent 1px);background-size:auto,auto,44px 44px,44px 44px}
.glow{display:none}
.progress{position:fixed;top:0;left:0;height:3px;width:100%;transform-origin:0 50%;transform:scaleX(0);background:linear-gradient(90deg,var(--cy),var(--vi),var(--am));z-index:60}
main,.foot{position:relative;z-index:1}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:10px max(18px,env(safe-area-inset-right)) 10px max(18px,env(safe-area-inset-left));border-bottom:1px solid transparent;transition:border-color .3s}
.nav::before{content:"";position:absolute;inset:0;z-index:-1;background:rgba(255,255,255,.94);opacity:0;transition:opacity .3s}
.nav.stuck::before{opacity:1}
.nav.stuck{border-color:var(--line)}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;letter-spacing:.01em;min-height:44px;font-size:1.02rem}
.brand-wave{color:var(--cy);display:inline-flex}
#menu{display:flex;gap:4px;align-items:center}
#menu a{padding:9px 13px;border-radius:99px;color:var(--mut);font-size:.94rem;transition:.2s}
#menu a:hover,#menu a.act{color:var(--cy);background:rgba(29,78,216,.08)}
#menu .cta-link{border:1px solid var(--cy);color:var(--cy)}
#menu .cta-link:hover{background:var(--cy);color:#fff}
.burger{display:none;width:46px;height:46px;border-radius:12px;position:relative;z-index:61}
.burger span{position:absolute;left:12px;right:12px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.burger span:nth-child(1){top:16px}.burger span:nth-child(2){top:22px}.burger span:nth-child(3){top:28px}
.burger[aria-expanded=true] span:nth-child(1){top:22px;transform:rotate(45deg)}
.burger[aria-expanded=true] span:nth-child(2){opacity:0}
.burger[aria-expanded=true] span:nth-child(3){top:22px;transform:rotate(-45deg)}

/* HERO */
.hero{min-height:100svh;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;max-width:1240px;margin:0 auto;padding:110px 24px 70px;position:relative}
.hero>.hero-text,.hero>.hero-visual,.hero .portrait,.hero .circuit,.hero .fact{position:relative;z-index:1}
#pcb{position:absolute;inset:0;width:100%;height:100%;z-index:0;pointer-events:none;-webkit-mask-image:radial-gradient(ellipse 60% 55% at 38% 50%,rgba(0,0,0,.2),#000 88%);mask-image:radial-gradient(ellipse 60% 55% at 38% 50%,rgba(0,0,0,.2),#000 88%)}
.eyebrow{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cy);margin-bottom:14px;display:flex;align-items:center;gap:10px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--gr);box-shadow:0 0 0 0 rgba(15,157,106,.6);animation:pulse 2s infinite;flex:none}
@keyframes pulse{70%{box-shadow:0 0 0 10px rgba(15,157,106,0)}100%{box-shadow:0 0 0 0 rgba(15,157,106,0)}}
h1{line-height:1.05;margin-bottom:14px}
h1 .hello{display:block;font-size:1.2rem;color:var(--mut);font-weight:400;margin-bottom:6px}
h1 .name{display:block;font-size:clamp(2.2rem,6.2vw,4.6rem);font-weight:700;letter-spacing:-.02em;background:linear-gradient(95deg,#0b1f4d 0%,#1d4ed8 55%,#0e7490 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.typed-line{font-size:1.1rem;color:var(--am);min-height:2em;margin-bottom:12px}
.caret{animation:blink 1s steps(1) infinite;color:var(--am)}
@keyframes blink{50%{opacity:0}}
.lead{color:var(--tx2);max-width:58ch;font-size:1.08rem}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:99px;font-weight:600;font-size:.97rem;transition:transform .2s,box-shadow .2s,background .2s;min-height:48px}
.btn.primary{background:linear-gradient(95deg,#1d4ed8,#3b63e8);color:#fff;box-shadow:0 10px 26px -12px rgba(29,78,216,.7)}
.btn.primary:hover{transform:translateY(-2px)}
.btn.ghost{border:1px solid var(--line);background:#fff}
.btn.ghost:hover{border-color:var(--cy);color:var(--cy);transform:translateY(-2px)}
.btn.story-btn{border:1px solid rgba(180,83,9,.45);color:var(--am);background:rgba(180,83,9,.05)}
.btn.story-btn:hover{background:var(--am);color:#fff;transform:translateY(-2px)}
.hero-meta{list-style:none;display:flex;gap:6px 18px;flex-wrap:wrap;font-size:.8rem;color:var(--mut);margin-top:18px}
.hero-meta li::before{content:"▸ ";color:var(--cy)}
#clock::before{content:"● ";color:var(--gr);animation:blink 2s steps(1) infinite}
.hero-visual{display:flex;flex-direction:column;gap:20px;align-items:center}
.portrait{position:relative;width:min(330px,70vw);aspect-ratio:1;border-radius:50%;padding:7px}
.portrait .ring{position:absolute;inset:0;border-radius:50%;background:conic-gradient(from 0deg,var(--cy),var(--vi),var(--am),var(--cy));animation:spin 10s linear infinite;-webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 4px),#000 calc(100% - 3px));mask:radial-gradient(farthest-side,transparent calc(100% - 4px),#000 calc(100% - 3px))}
@keyframes spin{to{transform:rotate(360deg)}}
.portrait img{width:100%;height:100%;border-radius:50%;object-fit:cover;border:6px solid #fff;background:#e8eef9;box-shadow:0 20px 40px -22px rgba(17,38,86,.5)}
.tag{position:absolute;background:#fff;border:1px solid var(--line);border-radius:10px;padding:6px 10px;font-size:.72rem;color:var(--cy);white-space:nowrap;box-shadow:var(--sh);animation:float 5s ease-in-out infinite}
.tag.t1{left:-6%;bottom:8%}.tag.t2{right:-4%;top:10%;color:var(--am);animation-delay:-2.5s}
@keyframes float{50%{transform:translateY(-8px)}}
.circuit{width:100%;max-width:440px;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden;box-shadow:var(--sh)}
.cc-head{display:flex;justify-content:space-between;font-size:.68rem;color:var(--mut);padding:9px 14px;letter-spacing:.08em;border-bottom:1px solid var(--line);background:var(--soft)}
.cc-head span:last-child{color:var(--cy)}
#ccSvg{display:block;width:100%;height:auto;--ink:#0e1a33}
.ccl{font-family:var(--mono);font-size:13px;fill:var(--mut)}
.cc-read{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;padding:10px 14px;border-top:1px solid var(--line);font-size:.74rem;color:var(--mut);background:var(--soft)}
.cc-read b{color:var(--cy);font-weight:500}
.scroll-cue{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);font-size:.7rem;color:var(--mut);letter-spacing:.2em;text-transform:uppercase;display:flex;flex-direction:column;align-items:center;gap:6px}
.scroll-cue span{width:1px;height:28px;background:linear-gradient(var(--cy),transparent);animation:cue 1.8s infinite}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
.js .h-in{opacity:0;transform:translateY(20px)}
.ready .h-in{animation:heroIn .9s cubic-bezier(.2,.7,.2,1) both;animation-delay:var(--d,0s)}
@keyframes heroIn{to{opacity:1;transform:none}}
.name .sc{display:inline-block;text-align:center;color:var(--cy)}
.name .sc.lock{color:var(--ink)}

/* SECTIONS */
.sec{max-width:1240px;margin:0 auto;padding:88px 24px}
.sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:34px}
.idx{color:var(--cy);font-size:.95rem}
h2{font-size:clamp(1.8rem,4.5vw,3rem);letter-spacing:-.02em;line-height:1.12;padding-right:18px}
.sec-head::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent);align-self:center}
.sec-intro{color:var(--mut);max-width:62ch;margin:-12px 0 30px}
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ABOUT */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:40px}
.about-copy p{color:var(--tx2);margin-bottom:16px;font-size:1.05rem}
.about-copy strong{color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chips span{font-family:var(--mono);font-size:.76rem;padding:6px 12px;border-radius:99px;border:1px solid var(--line);background:var(--soft);color:#27407a}
.chips.small{margin-top:14px}.chips.small span{font-size:.7rem;padding:4px 10px}
.edu,.stats>div{border:1px solid var(--line);background:var(--card);border-radius:var(--r);box-shadow:var(--sh)}
.edu{padding:22px;margin-bottom:16px}
.edu h3{font-size:.75rem;letter-spacing:.14em;color:var(--cy);margin-bottom:14px}
.edu-item{padding:12px 0 12px 16px;border-left:2px solid var(--line);position:relative;display:flex;flex-direction:column;gap:2px}
.edu-item::before{content:"";position:absolute;left:-6px;top:18px;width:10px;height:10px;border-radius:50%;background:var(--cy)}
.edu-item span{color:var(--mut);font-size:.9rem}.edu-item em{font-style:normal;font-size:.74rem;color:var(--am)}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stats>div{padding:18px;text-align:center}
.stats>div.wide{grid-column:1/-1}
.stats b{display:block;font-size:2.2rem;line-height:1;color:var(--cy)}
.stats b[data-plus]::after{content:"+"}
.stats b[data-pre]::before{content:"≈"}
.stats span{font-size:.82rem;color:var(--mut)}

/* PROJECTS */
.featured{display:grid;grid-template-columns:1fr 1fr;gap:34px;border:1px solid var(--line);background:linear-gradient(135deg,#fff,#f1f5fd);border-radius:24px;padding:34px;margin-bottom:60px;box-shadow:var(--sh)}
.featured h3{font-size:clamp(1.8rem,4vw,2.5rem);margin-bottom:10px}
.featured p{color:var(--tx2)}
.ticks{list-style:none;margin:16px 0 4px}
.ticks li{padding-left:26px;position:relative;margin:7px 0;color:var(--tx2);font-size:.95rem}
.ticks li::before{content:"✓";position:absolute;left:0;color:var(--gr);font-weight:700}
.pc-shots{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-content:start}
.zoom{display:block;border-radius:14px;overflow:hidden;border:1px solid var(--line);position:relative;aspect-ratio:3/4;background:#e9eef8}
.zoom img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.zoom:hover img{transform:scale(1.05)}
.zoom::after{content:"⤢";position:absolute;right:8px;bottom:8px;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.9);color:var(--cy);box-shadow:0 2px 8px rgba(0,0,0,.18)}
.zoom.pcs{aspect-ratio:4/3;text-align:left}
.zoom.pcs span{position:absolute;left:0;right:0;bottom:0;padding:26px 12px 9px;font-size:.82rem;font-weight:600;color:#fff;background:linear-gradient(transparent,rgba(9,20,45,.78))}
.sub-head{margin-bottom:24px}
.sub-head h3{font-size:1.6rem}.sub-head p{color:var(--mut)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{border:1px solid var(--line);background:var(--card);border-radius:22px;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--sh);transition:border-color .3s,box-shadow .3s}
.card:hover{border-color:rgba(29,78,216,.45)}
.card.wide{grid-column:1/-1;flex-direction:row}
.card.wide .slider{flex:1.1}.card.wide .card-body{flex:1}
.slider{position:relative;aspect-ratio:var(--ar);max-height:520px;overflow:hidden;background:#0b1220;width:100%}
.card:not(.wide) .slider{aspect-ratio:4/4.4}
.slide{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .6s}
.slide.on{opacity:1}
.sl{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.88);border:1px solid var(--line);font-size:1.5rem;line-height:1;display:grid;place-items:center;color:var(--ink);box-shadow:0 4px 12px rgba(0,0,0,.2)}
.sl.prev{left:10px}.sl.next{right:10px}
.sl:hover{background:var(--cy);color:#fff}
.dots{position:absolute;left:0;right:0;bottom:10px;display:flex;justify-content:center;gap:7px}
.dots i{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.6);transition:.3s}
.dots i.on{background:#fff;width:20px;border-radius:4px}
.card-body{padding:24px}
.card-body h3{font-size:1.4rem;margin-bottom:8px;line-height:1.25}
.card-body>p{color:var(--tx2);font-size:.97rem}
details{margin-top:14px;border-top:1px dashed var(--line);padding-top:12px}
summary{cursor:pointer;color:var(--cy);font-family:var(--mono);font-size:.82rem;list-style:none;display:flex;align-items:center;gap:8px;min-height:40px}
summary::-webkit-details-marker{display:none}
summary::before{content:"+";display:inline-grid;place-items:center;width:20px;height:20px;border:1px solid var(--cy);border-radius:50%;transition:.3s}
details[open] summary::before{content:"–"}
details ol{padding:8px 0 0 20px;color:var(--tx2);font-size:.92rem}
details li{margin:4px 0}

/* INTERESTS */
.int-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.int{border:1px solid var(--line);background:var(--card);border-radius:22px;padding:26px;transition:.3s;box-shadow:var(--sh)}
.int:hover{border-color:rgba(180,83,9,.45);transform:translateY(-4px)}
.ico{width:100px;height:100px;color:var(--cy);margin-bottom:12px;overflow:visible}
.int h3{font-size:1.25rem;margin-bottom:8px}
.int p{color:var(--tx2);font-size:.92rem}
.eq{display:inline-block;margin-top:14px;font-size:.78rem;color:var(--am);border-top:1px dashed var(--line);padding-top:10px;width:100%}
.orb{transform-origin:60px 60px;animation:orb 7s linear infinite}
.o2{transform:rotate(60deg);animation-name:orb2}.o3{transform:rotate(120deg);animation-name:orb3}
@keyframes orb{to{transform:rotate(360deg)}}@keyframes orb2{from{transform:rotate(60deg)}to{transform:rotate(420deg)}}@keyframes orb3{from{transform:rotate(120deg)}to{transform:rotate(480deg)}}
.nuc{fill:var(--am);animation:pulse2 2s ease-in-out infinite;transform-origin:60px 60px}
@keyframes pulse2{50%{transform:scale(1.35)}}
.el{fill:var(--cy);transform-origin:60px 60px;animation:orb 3.2s linear infinite}
.sun{fill:var(--am);transform-origin:60px 60px;animation:pulse2 3s ease-in-out infinite}
.spin{transform-origin:60px 60px;fill:var(--cy)}
.s1{animation:orb 4s linear infinite}.s2{animation:orb 9s linear infinite;fill:var(--vi)}.s3{animation:orb 15s linear infinite;fill:var(--gr)}
.mer{opacity:.7}.pin{fill:var(--am)}
.hand{transform-origin:60px 60px;animation:orb 8s linear infinite}.h2{animation-duration:96s}
.space{margin-top:56px;border:1px solid var(--line);border-radius:24px;padding:30px;background:linear-gradient(135deg,#fff,#f1f5fd);box-shadow:var(--sh)}
.space-head h3{font-size:clamp(1.4rem,3vw,2rem);margin-bottom:8px}
.space-head p:not(.eyebrow){color:var(--tx2);max-width:68ch}
.space-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:22px}
.space figure{margin:0}
.zoom.sp{aspect-ratio:16/9;width:100%;background:#000}
.space figcaption{padding:12px 4px 0;display:flex;flex-direction:column;gap:2px}
.space figcaption b{font-size:1.05rem}
.space figcaption span{color:var(--tx2);font-size:.9rem}

/* ACHIEVEMENTS */
.timeline{position:relative;display:flex;flex-direction:column;gap:30px;padding-left:34px}
.timeline::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--cy),var(--vi),transparent)}
.ach{display:grid;grid-template-columns:92px 1fr;gap:20px;position:relative}
.ach::before{content:"";position:absolute;left:-33px;top:8px;width:14px;height:14px;border-radius:50%;background:#fff;border:3px solid var(--cy)}
.ach-year{font-size:1.5rem;color:var(--am);padding-top:2px}
.ach-body{border:1px solid var(--line);background:var(--card);border-radius:20px;padding:24px;box-shadow:var(--sh)}
.ach-body h3{font-size:1.35rem;margin-bottom:8px}
.ach-body p{color:var(--tx2);max-width:70ch}
.ach-body b{color:var(--am);font-weight:600}
.pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px;max-width:560px}
.pair.single{grid-template-columns:minmax(0,1fr);max-width:340px}
.pair.single.wide-img{max-width:720px}
.pair .zoom{aspect-ratio:3/4}
.wide-img .zoom{aspect-ratio:2/1}
.single:not(.wide-img) .zoom{aspect-ratio:6/5}

/* GALLERY */
.gal{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:230px;gap:16px}
.g{display:block;width:100%;height:100%;border-radius:18px;overflow:hidden;position:relative;border:1px solid var(--line);background:#e9eef8}
.g img{width:100%;height:100%;object-fit:cover;transition:transform .7s}
.g.a{grid-column:1;grid-row:1/3}.g.b{grid-column:2/4;grid-row:1}.g.c{grid-column:2;grid-row:2}.g.d{grid-column:4;grid-row:1/3}.g.e{grid-column:3;grid-row:2}.g.p1{grid-column:1/3;grid-row:3/5}.g.p2{grid-column:3/5;grid-row:3}.g.p3{grid-column:3/5;grid-row:4}
.g:hover img{transform:scale(1.05)}
.g span{position:absolute;left:0;right:0;bottom:0;padding:34px 14px 12px;text-align:left;font-size:.92rem;font-weight:500;color:#fff;background:linear-gradient(transparent,rgba(5,12,30,.78))}

/* CONTACT */
.contact-card{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:26px;padding:40px;background:linear-gradient(135deg,#fff,#eef3fc);box-shadow:var(--sh)}
.big{font-size:clamp(1.2rem,2.6vw,1.7rem);line-height:1.45;max-width:36ch;margin-bottom:24px}
.socs{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;position:relative;z-index:1}
.soc{display:flex;align-items:center;gap:14px;padding:14px 16px;min-height:64px;border:1px solid var(--line);border-radius:16px;background:#fff;transition:transform .2s,border-color .2s,box-shadow .2s}
.soc:hover{transform:translateY(-3px);box-shadow:0 14px 26px -16px rgba(17,38,86,.5)}
.soc svg{width:30px;height:30px;flex:none;padding:5px;border-radius:9px;color:#fff;background:var(--cy)}
.soc.mail svg{background:#374151}.soc.fb svg{background:#1877f2}.soc.li svg{background:#0a66c2}.soc.ig svg{background:linear-gradient(45deg,#f09433,#dc2743 55%,#bc1888)}.soc.gh svg{background:#24292f}
.soc span{display:flex;flex-direction:column;line-height:1.3;min-width:0}
.soc b{font-size:1rem}.soc em{font-style:normal;font-size:.8rem;color:var(--mut);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cc-flow{display:block;width:100%;height:14px;margin-top:30px;color:rgba(29,78,216,.35);animation:flow 1.2s linear infinite}
@keyframes flow{to{stroke-dashoffset:-12}}
.cc-flow path{animation:flow 1.2s linear infinite}
.foot{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between;align-items:center;max-width:1240px;margin:0 auto;padding:30px 24px 40px;color:var(--mut);font-size:.8rem;border-top:1px solid var(--line)}
.foot a{color:var(--cy)}
.foot-soc{display:flex;gap:8px}
.foot-soc a{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--mut)}
.foot-soc a:hover{color:var(--cy);border-color:var(--cy)}
.foot-soc svg{width:18px;height:18px}

/* LIGHTBOX */
.lb{position:fixed;inset:0;z-index:100;background:rgba(8,14,30,.95);display:flex;align-items:center;justify-content:center;flex-direction:column;padding:20px}
.lb[hidden]{display:none}
.lb img{max-width:100%;max-height:78vh;border-radius:12px;box-shadow:0 20px 80px #000;animation:zin .35s}
@keyframes zin{from{opacity:0;transform:scale(.94)}}
.lb p{margin-top:14px;color:#c6d1ea;font-size:.85rem;text-align:center;max-width:60ch}
.lb-x{position:absolute;top:14px;right:14px;width:46px;height:46px;font-size:2rem;border-radius:50%;border:1px solid rgba(255,255,255,.3);color:#fff}
.lb-n{position:absolute;top:50%;width:46px;height:46px;border-radius:50%;border:1px solid rgba(255,255,255,.3);font-size:1.8rem;transform:translateY(-50%);background:rgba(0,0,0,.4);color:#fff}
.lb-p{left:12px}.lb-nx{right:12px}

/* BOOT */
.boot{position:fixed;inset:0;z-index:300;background:#fff;display:flex;align-items:center;justify-content:center;padding:24px;transition:opacity .6s,visibility .6s;cursor:pointer}
.boot.out{opacity:0;visibility:hidden}
.boot-box{width:min(520px,100%);font-size:.88rem;color:var(--ink);line-height:1.9}
.boot-box .ok{color:var(--gr)}
.boot-box .ln{opacity:0;transform:translateX(-8px);animation:bl .3s forwards}
@keyframes bl{to{opacity:1;transform:none}}
.boot-bar{height:3px;background:var(--line);margin-top:16px;border-radius:3px;overflow:hidden}
.boot-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cy),var(--vi),var(--am));transition:width .25s linear}
.boot-skip{margin-top:14px;font-size:.7rem;color:var(--mut);letter-spacing:.14em}

/* STORY */
.story-top{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;margin-bottom:56px}
.legacy{position:relative;padding:32px 32px 28px 38px;border-left:4px solid var(--am);background:linear-gradient(90deg,rgba(180,83,9,.08),#fff);border-radius:0 20px 20px 0;box-shadow:var(--sh)}
.legacy p{font-family:var(--serif);font-size:clamp(1.3rem,3vw,1.95rem);line-height:1.4;font-style:italic;color:#2a1f0f}
.legacy p span{display:block;margin-top:8px;color:var(--am);font-style:normal;font-weight:600}
.legacy footer{margin-top:14px;font-size:.74rem;color:var(--mut)}
.story-intro p{color:var(--tx2);margin-bottom:14px}
.story-intro .where{font-size:.74rem;letter-spacing:.14em;color:var(--cy);margin-bottom:10px}
.story-intro .rs{font-family:var(--serif);font-style:italic;font-size:1.15rem;color:#5b4520}
.read-btn{margin-top:6px}
.lang-note{margin-left:14px;font-size:.74rem;color:var(--mut)}
.tl{position:relative;display:flex;flex-direction:column;gap:30px;padding:10px 0;--p:0}
.tl-line{position:absolute;left:50%;top:0;bottom:0;width:2px;margin-left:-1px;background:var(--line)}
.tl-fill{position:absolute;inset:0;transform-origin:top;transform:scaleY(var(--p));background:linear-gradient(var(--cy),var(--vi) 60%,var(--am))}
.tl-spark{position:absolute;left:50%;top:calc(var(--p)*100%);width:16px;height:16px;margin:-8px 0 0 -8px;border-radius:50%;background:#fff;border:3px solid var(--cy);box-shadow:0 0 0 5px rgba(29,78,216,.18),0 0 22px 4px rgba(29,78,216,.5);opacity:0;transition:opacity .3s}
.tl.on .tl-spark{opacity:1}
.tl-node{position:relative;display:grid;grid-template-columns:1fr 1fr;align-items:center}
.tl-t{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:50px;height:50px;border-radius:50%;display:grid;place-items:center;background:#fff;border:2px solid var(--line);color:var(--mut);font-size:.82rem;z-index:2;transition:.5s}
.tl-card{grid-column:1;margin-right:48px;text-align:right;border:1px solid var(--line);background:var(--card);border-radius:20px;padding:20px 22px;opacity:.35;transform:translateX(-24px) scale(.98);transition:opacity .7s,transform .7s,border-color .7s;box-shadow:var(--sh)}
.tl-node:nth-child(odd) .tl-card{grid-column:2;margin:0 0 0 48px;text-align:left;transform:translateX(24px) scale(.98)}
.tl-card h3{font-size:1.2rem;margin-bottom:6px}
.tl-card p{color:var(--tx2);font-size:.95rem}
.tl-card b{color:var(--am);font-weight:600}
.tl-node.lit .tl-t{border-color:var(--cy);color:var(--cy);box-shadow:0 0 0 5px rgba(29,78,216,.12)}
.tl-node.lit .tl-card{opacity:1;transform:none;border-color:rgba(29,78,216,.35)}
.tl-node.storm .tl-card h3{color:var(--warm)}
.tl-node.storm.lit .tl-t{border-color:var(--warm);color:var(--warm);box-shadow:0 0 0 5px rgba(217,72,15,.14)}
.tl-node.storm.lit .tl-card{border-color:rgba(217,72,15,.45)}
.tl-node.last.lit .tl-t{border-color:var(--am);color:var(--am);box-shadow:0 0 0 5px rgba(180,83,9,.14)}

/* QUOTES */
.qwrap{position:relative;border:1px solid var(--line);border-radius:26px;padding:56px 48px 28px;background:linear-gradient(135deg,#fff,#eff3fc);overflow:hidden;box-shadow:var(--sh)}
.qmark{position:absolute;left:24px;top:-18px;font-family:var(--serif);font-size:11rem;line-height:1;color:rgba(29,78,216,.1);pointer-events:none}
.qstage{position:relative;min-height:220px}
.q{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .5s,visibility .5s}
.q.on{opacity:1;visibility:visible;position:relative}
.q p{font-family:var(--serif);font-size:clamp(1.35rem,3.3vw,2.3rem);line-height:1.38;font-style:italic;color:var(--ink);max-width:28em}
.q.bn p{font-style:normal;font-family:'Hind Siliguri','Noto Sans Bengali',sans-serif;font-weight:500}
.q p .w{display:inline-block;opacity:0;transform:translateY(8px)}
.q.on p .w{animation:wIn .6s cubic-bezier(.2,.7,.2,1) forwards;animation-delay:calc(var(--i)*45ms)}
@keyframes wIn{to{opacity:1;transform:none}}
.q cite{display:block;margin-top:22px;font-style:normal;font-size:.95rem;color:var(--am);font-weight:600}
.q cite span{display:block;color:var(--mut);font-size:.76rem;margin-top:2px;font-weight:400}
.qnav{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:22px}
.qnav button{width:44px;height:44px;border-radius:50%;border:1px solid var(--line);font-size:1.4rem;background:#fff}
.qnav button:hover{background:var(--cy);color:#fff}
.qdots{display:flex;gap:7px;flex-wrap:wrap;justify-content:center}
.qdots i{width:8px;height:8px;border-radius:50%;background:#cfd8ea;cursor:pointer;transition:.3s}
.qdots i.on{background:var(--am);width:22px;border-radius:5px}
.qbar{height:2px;background:var(--line);margin-top:18px;border-radius:2px;overflow:hidden}
.qbar i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--cy),var(--am));transform-origin:left;transform:scaleX(0)}

/* READER */
.reader{position:fixed;inset:0;z-index:200;background:#fffdf9;color:var(--ink);display:flex;flex-direction:column;clip-path:circle(0 at var(--ox,50%) var(--oy,50%))}
.reader[hidden]{display:none}
.reader.open{animation:wipe .8s cubic-bezier(.65,0,.25,1) forwards}
.reader.closing{animation:wipeOut .45s cubic-bezier(.5,0,.8,.4) forwards}
@keyframes wipe{to{clip-path:circle(150% at var(--ox,50%) var(--oy,50%))}}
@keyframes wipeOut{from{clip-path:circle(150% at 50% 50%)}to{clip-path:circle(0 at 50% 50%)}}
.rd-bar{position:absolute;top:0;left:0;right:0;height:3px;z-index:3;background:var(--line)}
.rd-bar i{display:block;height:100%;width:100%;transform-origin:left;transform:scaleX(0);background:linear-gradient(90deg,var(--cy),var(--vi),var(--am))}
.rd-head{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 18px;border-bottom:1px solid var(--line);background:#fff}
.rd-title{font-size:.74rem;letter-spacing:.2em;color:var(--cy)}
.lang-sw{display:flex;border:1px solid var(--line);border-radius:99px;padding:3px}
.lang-sw button{padding:8px 16px;border-radius:99px;font-size:.9rem;color:var(--mut);font-family:var(--font),'Hind Siliguri';min-height:38px}
.lang-sw button.on{background:var(--cy);color:#fff;font-weight:600}
.rd-x{width:46px;height:46px;border-radius:50%;border:1px solid var(--line);font-size:1.8rem;line-height:1}
.rd-x:hover{background:var(--am);color:#fff}
.rd-scroll{position:relative;z-index:1;flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;scroll-behavior:smooth}
.rd-in{max-width:760px;margin:0 auto;padding:60px 22px 140px}
.rd-hero{text-align:center;margin-bottom:70px}
.kicker{font-size:.74rem;letter-spacing:.24em;color:var(--am);margin-bottom:16px}
.rd-hero h2{font-family:var(--serif);font-weight:600;font-size:clamp(2rem,6vw,3.3rem);line-height:1.14;margin-bottom:22px;padding:0;color:var(--ink)}
.rd-epi{font-family:var(--serif);font-style:italic;font-size:1.2rem;color:#5b4520;max-width:34em;margin:0 auto;padding-top:22px;position:relative}
.rd-epi::before{content:"";position:absolute;top:0;left:50%;width:60px;height:2px;margin-left:-30px;background:var(--am)}
.ch{position:relative;margin-bottom:60px;opacity:0;transform:translateY(30px);transition:opacity .8s,transform .8s}
.ch.in{opacity:1;transform:none}
.ch-n{display:block;font-family:var(--mono);font-size:clamp(3.4rem,13vw,6rem);line-height:.9;font-weight:500;color:transparent;-webkit-text-stroke:1.5px rgba(29,78,216,.45);margin-bottom:6px;letter-spacing:-.04em}
.ch h3{font-size:1.7rem;margin-bottom:16px}
.ch p{font-family:var(--serif);font-size:1.22rem;line-height:1.85;color:#26304a;margin-bottom:18px}
.ch p strong{color:var(--am);font-weight:600}
.ch p em{color:var(--cy)}
.en .ch:not(.storm) p:first-of-type::first-letter{float:left;font-size:3.5rem;line-height:.82;padding:6px 10px 0 0;color:var(--cy);font-weight:600}
.ch.storm{padding-left:22px;border-left:3px solid var(--warm);background:linear-gradient(90deg,rgba(217,72,15,.07),transparent)}
.ch.storm .ch-n{-webkit-text-stroke-color:rgba(217,72,15,.55)}
.sign{margin-top:26px;color:var(--am);font-size:.9rem;text-align:right}
.lang.bn{font-family:'Hind Siliguri','Noto Sans Bengali','Kalpurush',sans-serif}
.lang.bn p{font-size:1.18rem;line-height:2.05;color:#26304a;margin-bottom:22px;opacity:0;transform:translateY(22px);transition:opacity .7s,transform .7s}
.lang.bn p.in{opacity:1;transform:none}
.lang.bn p.sign{font-family:var(--mono)}
.reader[data-lang=en] .lang.bn,.reader[data-lang=bn] .lang.en{display:none}

/* RESPONSIVE */
@media (max-width:1020px){
  .int-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero{grid-template-columns:1fr;padding-top:96px}
  .hero-visual{display:contents}
  .portrait{order:-1;justify-self:center;width:min(210px,52vw)}
  .circuit,.fact{justify-self:center}
  .about-grid,.featured,.story-top,.space-grid{grid-template-columns:1fr}
  .scroll-cue{display:none}
  .cards{grid-template-columns:1fr}
  .gal{grid-template-columns:repeat(2,1fr);grid-auto-rows:200px}
  .g.a{grid-column:1;grid-row:1/3}.g.b{grid-column:2;grid-row:1}.g.c{grid-column:2;grid-row:2}.g.d{grid-column:1;grid-row:3/5}.g.e{grid-column:2;grid-row:3/5}.g.p1{grid-column:1/3;grid-row:5/7}.g.p2{grid-column:1;grid-row:7}.g.p3{grid-column:2;grid-row:7}
}
@media (max-width:900px){
  .tl-line{left:24px}.tl-spark{left:24px}
  .tl-node{grid-template-columns:1fr}
  .tl-t{left:24px;width:46px;height:46px;font-size:.76rem}
  .tl-card,.tl-node:nth-child(odd) .tl-card{grid-column:1;margin:0 0 0 62px;text-align:left;transform:translateX(20px) scale(.98)}
  .tl-node.lit .tl-card,.tl-node.lit:nth-child(odd) .tl-card{transform:none}
  .qwrap{padding:48px 22px 22px}.qmark{font-size:8rem}.qstage{min-height:300px}
}
@media (max-width:820px){
  .burger{display:block}
  #menu{position:fixed;inset:0;background:#fff;flex-direction:column;justify-content:center;gap:10px;opacity:0;pointer-events:none;transition:opacity .3s;z-index:60}
  #menu.open{opacity:1;pointer-events:auto}
  #menu a{font-size:1.4rem;padding:12px 24px;color:var(--ink)}
  .card.wide{flex-direction:column}
}
@media (max-width:620px){
  .sec{padding:58px 18px}
  .hero{padding:84px 18px 44px;gap:22px}
  .brand{font-size:.95rem}
  .int-grid{grid-template-columns:1fr}
  .featured{padding:22px 18px}
  .timeline{padding-left:26px}
  .ach{grid-template-columns:1fr;gap:8px}
  .ach::before{left:-25px}
  .ach-body{padding:18px}
  .contact-card{padding:26px 18px}
  .space{padding:20px 16px}
  .tag.t1{left:0}.tag.t2{right:0}
  .pair{max-width:none}
  .gal{grid-auto-rows:150px;gap:10px}.g{border-radius:14px}
  .lb-n{top:auto;bottom:18px;transform:none}
  .stats b{font-size:1.8rem}
  .rd-in{padding:40px 18px 120px}.ch p{font-size:1.12rem}
  .rd-title{display:none}.rd-head{padding:10px 12px}
  .lang-note{display:block;margin:10px 0 0}
  .legacy{padding:22px 18px 20px 22px}
  .btns .btn{flex:1 1 auto}
  .socs{grid-template-columns:1fr}
  .foot{justify-content:center;text-align:center}
}
@media (hover:none){.card:hover,.int:hover,.soc:hover{transform:none}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}.reveal,.js .h-in{opacity:1;transform:none}.tl-card{opacity:1;transform:none}.q p .w{opacity:1;transform:none}
}

/* ===== floaters (DOM, GPU-friendly, cannot smear) ===== */
.fl{position:absolute;top:100%;white-space:nowrap;font-family:'JetBrains Mono',monospace;color:var(--cy);opacity:var(--o,.15);animation:flUp linear infinite;will-change:transform}
.fl.fs{line-height:0}
@keyframes flUp{from{transform:translate3d(0,0,0)}50%{transform:translate3d(14px,-60vh,0)}to{transform:translate3d(-8px,-120vh,0)}}
@media (prefers-reduced-motion:reduce){.fl{animation:none;top:auto;bottom:10%}}

/* ===== lightbox zoom ===== */
.lb img{cursor:zoom-in}
.lb img.zoomed{cursor:zoom-out;max-width:none;max-height:none;width:220vw;animation:none}
.lb.zm{overflow:auto;justify-content:flex-start;align-items:flex-start;-webkit-overflow-scrolling:touch}
.lb.zm img{margin:50px auto}
.lb.zm p{display:none}
.lb-x,.lb-n{z-index:3}
.lb.zm .lb-x{position:fixed}.lb.zm .lb-n{position:fixed}
@media (min-width:900px){.lb img.zoomed{width:150vw}}

/* ===== certificate + more projects ===== */
.pair:has(.cert){grid-template-columns:1.5fr 1fr;max-width:660px;align-items:start}
.pair .zoom.cert{aspect-ratio:4/3}
.zoom.pcs.tall{aspect-ratio:3/4}
.featured+.featured{margin-top:-24px}

/* ===== Idea Lab ===== */
.lab{margin-top:56px;border:1px solid var(--line);border-radius:24px;padding:30px;background:linear-gradient(135deg,#fff,#f1f5fd);box-shadow:var(--sh)}
.lab .space-head h3{font-size:clamp(1.4rem,3vw,2rem);margin-bottom:8px}
.lab .space-head p:not(.eyebrow){color:var(--tx2);max-width:68ch}
.tabs{display:flex;gap:8px;margin:22px 0 20px;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:4px;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{flex:0 0 auto;padding:11px 20px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--tx2);font-weight:600;font-size:.95rem;min-height:44px;transition:.2s}
.tabs button[aria-selected=true]{background:var(--cy);border-color:var(--cy);color:#fff;box-shadow:0 6px 18px rgba(29,78,216,.28)}
.tp[hidden]{display:none}
.tp{animation:tpin .35s}
@keyframes tpin{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.il-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.il-card{border:1px solid var(--line);border-radius:18px;background:#fff;padding:20px 20px 18px;display:flex;flex-direction:column;gap:10px}
.il-card h4{font-size:1.1rem;color:var(--ink)}
.il-card p{color:var(--tx2);font-size:.95rem}
.il-card .zoom.map{aspect-ratio:auto;margin-top:6px}
.il-card .zoom.map img{height:auto}
blockquote{margin:2px 0 0;padding:10px 14px;border-left:3px solid var(--am);background:#fff8ef;border-radius:0 10px 10px 0;font-family:'Newsreader',serif;font-style:italic;font-size:1rem;color:var(--ink)}
blockquote cite{display:block;margin-top:4px;font-family:'JetBrains Mono',monospace;font-style:normal;font-size:.72rem;color:var(--mut)}
.il-sub{font-size:1.2rem;margin:6px 0 8px;color:var(--ink)}
.il-note{color:var(--mut);font-size:.88rem;margin-bottom:14px}
.issues{list-style:none;padding:0;margin:0 0 28px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.issues li{border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;color:var(--tx2);font-size:.92rem}
.issues li b{color:var(--ink)}
.hist{display:grid;gap:18px}
.hs{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:22px;border:1px solid var(--line);border-radius:18px;background:#fff;padding:18px;align-items:start}
.hs:nth-child(even){grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}
.hs:nth-child(even) .zoom{order:2}
.hs .zoom.map{aspect-ratio:auto}
.hs .zoom.map img{height:auto}
.hs h4{font-size:1.25rem;margin-bottom:8px;color:var(--ink)}
.hs p{color:var(--tx2);font-size:.95rem;margin-bottom:8px}
.hs .note{color:var(--cy);font-weight:600;font-size:.88rem}
.hs blockquote{margin-top:10px}
@media (max-width:820px){
  .il-grid,.issues{grid-template-columns:1fr}
  .hs,.hs:nth-child(even){grid-template-columns:1fr}
  .hs:nth-child(even) .zoom{order:0}
  .lab{padding:20px 14px}
}

/* ===== Curiosity v2 ===== */
.int-grid{grid-template-columns:repeat(3,minmax(0,1fr));align-items:start}
.int .studied{margin:14px 0 6px;font-size:.7rem;letter-spacing:.1em;color:var(--am);font-weight:700}
.int .chips{margin-bottom:6px}
.int blockquote{margin-top:12px}
.hwall{margin-top:56px;border:1px solid var(--line);border-radius:24px;padding:30px;background:linear-gradient(135deg,#fff,#f1f5fd);box-shadow:var(--sh)}
.hwall .space-head h3{font-size:clamp(1.4rem,3vw,2rem);margin-bottom:8px}
.hwall .space-head p:not(.eyebrow){color:var(--tx2);max-width:75ch}
.hg{margin-top:30px}
.hg-t{font-size:1.25rem;color:var(--ink);display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid var(--line)}
.hg-t small{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:var(--am);font-weight:600;letter-spacing:.06em}
.hts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.ht{position:relative;border:1px solid var(--line);border-radius:18px;background:#fff;padding:18px;overflow:hidden;transition:transform .3s,box-shadow .3s,border-color .3s}
.ht::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--cy),var(--vi))}
.ht:hover{transform:translateY(-4px);box-shadow:0 14px 34px -16px rgba(29,78,216,.4);border-color:#c7d4f0}
.ht .hi{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,#eaf0ff,#f6f0ff);font-size:1.5rem;margin-bottom:10px;font-family:'JetBrains Mono',monospace;color:var(--cy);font-weight:700}
.ht h4{font-size:1.1rem;color:var(--ink);margin-bottom:6px}
.ht blockquote{font-size:.95rem;margin:0}
.hts.pro .ht{border-color:#cfe9dd}
.hts.pro .ht::before{background:linear-gradient(var(--gr),#2bb58a)}
.hts.pro .hi{background:linear-gradient(135deg,#e6f7ef,#f0fbf6);color:var(--gr);font-size:1.05rem}
.hts.pro .ht:last-child{grid-column:span 2}
@media (max-width:1020px){.int-grid{grid-template-columns:1fr 1fr}.hts{grid-template-columns:1fr 1fr}}
@media (max-width:700px){.int-grid,.hts{grid-template-columns:1fr}.hts.pro .ht:last-child{grid-column:auto}.hwall{padding:20px 14px}}
@media (hover:none){.ht:hover{transform:none}}

/* ===== hero fact card ===== */
.fact{width:100%;max-width:440px;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden;box-shadow:var(--sh);position:relative}
.fact::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--cy),var(--vi))}
.fact-head{display:flex;justify-content:space-between;font-size:.68rem;color:var(--mut);padding:10px 18px 10px 20px;letter-spacing:.08em;border-bottom:1px solid var(--line);background:var(--soft)}
.fact-head span:first-child{color:var(--am);font-weight:700}
.fact-body{padding:18px 20px 8px;min-height:150px}
.fact-body h3{font-size:1.2rem;color:var(--ink);margin-bottom:8px}
.fact-body p{color:var(--tx2);font-size:.97rem;line-height:1.6}
.fact.in .fact-body{animation:tpin .5s}
.fact-foot{padding:6px 20px 16px}
.fact-dots{display:flex;gap:8px}
.fact-dots i{width:9px;height:9px;border-radius:50%;background:#d5deef;cursor:pointer;transition:.3s;position:relative}
.fact-dots i::after{content:"";position:absolute;inset:-9px}
.fact-dots i.on{background:var(--cy);width:24px;border-radius:6px}