/* CERT-In SAMVAAD 2027 conference site. Colours: CERT-In blue, orange from the event logo, charcoal, white. */
:root{
  --char:#262626; --char-900:#1a1a1a; --char-700:#333; --orange:#f26601; --orange-600:#d85a00; --orange-900:#b84c00;
  --blue:#1d5fae; --blue-700:#154a8a; --navy:#0f2f5c; --navy-900:#0a2244; --sky:#eaf2fb; --paper:#f6f4f1; --ink:#1d1d1d; --ink-2:#444; --mute:#6b6b6b; --line:#e2ddd6; --white:#fff;
  --head:'Barlow Condensed','Arial Narrow',Impact,sans-serif; --body:'Barlow',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --gut:clamp(18px,4.5vw,64px);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;overflow-x:hidden;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--body);-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:var(--blue);text-underline-offset:3px}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-9999px;top:8px;background:#fff;color:var(--char);padding:10px 16px;border-radius:999px;font-weight:700;z-index:50}
.skip:focus{left:16px}
.wrap{max-width:1200px;margin:0 auto;padding:0 var(--gut)}
h1,h2,h3{font-family:var(--head);line-height:1;margin:0;letter-spacing:.005em}
.h2{font-size:clamp(38px,5vw,60px);font-weight:700;text-transform:uppercase}
.h2 em{font-style:normal;color:var(--orange)}
.kicker{margin:0 0 14px;font:700 13.5px/1 var(--body);letter-spacing:.18em;text-transform:uppercase;color:var(--orange)}
.lead{font-size:clamp(18px,1.6vw,20px);color:var(--ink-2);max-width:62ch}

/* header */
.top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);color:var(--navy);transition:box-shadow .3s}
.top.scrolled{box-shadow:0 6px 24px rgba(15,47,92,.12)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:74px}
.brand{display:flex;align-items:center;gap:18px;text-decoration:none}
.brand img{height:40px;width:auto}
.brand .chip{display:inline-flex;align-items:center;background:var(--navy);border-radius:10px;padding:6px 10px}
.brand .chip img{height:34px}
.brand .sep{width:1px;height:36px;background:var(--line)}
.brand .certin{height:30px}
.nav{display:flex;align-items:center;gap:4px 24px}
.nav a{color:var(--ink-2);text-decoration:none;font-weight:600;font-size:15px;padding:8px 0;border-bottom:2px solid transparent;letter-spacing:.01em}
.nav a:hover,.nav a.on{color:var(--navy);border-bottom-color:var(--orange)}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--navy);border-radius:10px;width:44px;height:44px;cursor:pointer;font-size:0}
.burger i{display:block;width:20px;height:2px;background:var(--navy);margin:4px auto;transition:transform .25s,opacity .25s}
.burger[aria-expanded="true"] i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger[aria-expanded="true"] i:nth-child(2){opacity:0}
.burger[aria-expanded="true"] i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border-radius:999px;font:700 16px/1 var(--body);text-decoration:none;border:2px solid transparent;cursor:pointer;transition:background .2s,color .2s,border-color .2s,transform .2s}
.btn:hover{transform:translateY(-1px)}
.btn-orange{background:var(--orange);color:#fff}
.btn-orange:hover{background:var(--orange-600);color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.45);color:#fff;background:transparent}
.btn-ghost:hover{border-color:#fff;color:#fff}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--navy-900);color:#fff}
.btn-line{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-line:hover{background:var(--navy);color:#fff}
.btn-sm{min-height:42px;padding:0 18px;font-size:14.5px}
.btn .arr{font-weight:400;font-size:1.1em}

/* hero */
.hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(120% 90% at 80% 40%,#1c4d8a 0%,var(--navy) 45%,var(--navy-900) 100%)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:44px 44px;-webkit-mask-image:radial-gradient(70% 70% at 70% 40%,#000,transparent 80%);mask-image:radial-gradient(70% 70% at 70% 40%,#000,transparent 80%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:40px;align-items:center;padding-top:clamp(56px,8vw,110px);padding-bottom:clamp(56px,8vw,110px)}
.eyebrow{display:flex;align-items:center;gap:12px;margin:0 0 26px;font-size:13.5px;letter-spacing:.18em;text-transform:uppercase;font-weight:700;color:var(--orange)}
.eyebrow::before{content:"";flex:none;width:28px;height:3px;background:var(--orange)}
.hero-logo{width:min(520px,100%);height:auto}
.theme{margin:30px 0 0;max-width:24ch;font-size:clamp(30px,3.9vw,54px);font-weight:700;text-transform:uppercase;line-height:.98}
.theme em{font-style:normal;color:var(--orange)}
.meta{display:flex;flex-wrap:wrap;gap:10px 28px;margin:26px 0 0;font-size:15px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:#cfdcec}
.meta span{display:flex;align-items:center;gap:10px}
.meta span::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--orange)}
.ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
.hero-right{justify-self:center;width:100%;max-width:420px;display:flex;flex-direction:column;align-items:center;gap:28px}
.hex-wrap{position:relative;width:100%;aspect-ratio:552/570}
.cm{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 18px 14px;background:#fff;border-radius:14px;text-decoration:none;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.cm span{font:700 11px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--char)}
.cm img{width:96px;height:auto}
.hex{position:absolute;inset:0;-webkit-clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.hex.ring{background:var(--orange)}
.hex.ring2{inset:-14px;background:#fff;opacity:.92}
.hex.pic{inset:16px;background:url(../img/hex.jpg) center/cover no-repeat}
.hex-glow{position:absolute;inset:-60px;border-radius:50%;background:radial-gradient(closest-side,rgba(242,102,1,.35),transparent);filter:blur(12px);z-index:-1}
@media (prefers-reduced-motion:no-preference){
  .hex-wrap{animation:float 7s ease-in-out infinite}
  .hex-glow{animation:pulse 5s ease-in-out infinite}
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
@keyframes pulse{0%,100%{opacity:.5}50%{opacity:1}}
.stripe{height:6px;background:linear-gradient(90deg,var(--orange) 0 60%,#fff 60% 75%,var(--blue) 75%)}

/* fact strip */
.facts{background:#fff;border-bottom:1px solid var(--line)}
.facts .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0 auto}
.facts div{padding:26px 24px 24px 0;border-right:1px solid var(--line)}
.facts div:last-child{border-right:0}
.facts div+div{padding-left:24px}
.facts dt{font:700 12.5px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.facts dd{margin:8px 0 0;font:700 clamp(24px,2.4vw,32px)/1.05 var(--head);color:var(--navy)}
.facts dd small{display:block;margin-top:4px;font:500 14px/1.4 var(--body);color:var(--ink-2)}

/* sections */
.block{padding:clamp(64px,8vw,110px) 0}
.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.block.dark{background:linear-gradient(135deg,var(--navy-900) 0%,var(--navy) 60%,#153a6e 100%);color:#fff}
.block.dark .lead{color:#d7d7d7}.block.dark .kicker{color:var(--orange)}
.two{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(28px,5vw,72px);align-items:start}
.sticky{position:sticky;top:100px}
.prose p{margin:0 0 18px;font-size:17.5px;line-height:1.7;color:var(--ink-2)}
.prose p:first-child{font-size:20px;color:var(--ink)}
.prose b{color:var(--ink)}
.items{list-style:none;margin:40px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px}
.items li{padding-top:18px;border-top:3px solid var(--orange)}
.items h3{font-size:30px;font-weight:700;text-transform:uppercase}
.items p{margin:10px 0 0;color:var(--ink-2);font-size:16px}
.block.dark .items li{border-top-color:var(--orange)}.block.dark .items p{color:#cfcfcf}

/* call for papers */
.timeline{list-style:none;margin:40px 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;position:relative}
.timeline::before{content:"";position:absolute;left:0;right:0;top:9px;height:2px;background:rgba(255,255,255,.18)}
.timeline li{position:relative;padding:34px 24px 0 0}
.timeline li::before{content:"";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:var(--navy);border:3px solid var(--orange)}
.timeline li.key::before{background:var(--orange)}
.timeline b{display:block;font:700 28px/1 var(--head);text-transform:uppercase}
.timeline span{display:block;margin-top:6px;color:#cfcfcf;font-size:15px}
.themes{list-style:none;margin:36px 0 0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}
.themes li{padding:18px 0 0;border-top:2px solid rgba(255,255,255,.2);font-size:15.5px;line-height:1.4}
.themes li b{display:block;font:700 34px/1 var(--head);color:var(--orange);margin-bottom:8px}

/* schedule */
.days{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;margin-top:40px}
.days div{padding:22px 0 0;border-top:3px solid var(--blue)}
.days h3{font-size:34px;text-transform:uppercase}
.days h3 a{color:inherit;text-decoration:none}.days h3 a:hover{color:var(--orange)}
.days h3 small{display:block;font:600 14px/1 var(--body);letter-spacing:.12em;color:var(--orange);text-transform:uppercase;margin-bottom:8px}
.days p{margin:10px 0 0;color:var(--mute)}

/* registration */
.fee{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,5vw,72px);align-items:start}
.fee .price{margin-top:6px}
.price{font:700 clamp(56px,7vw,92px)/1 var(--head);color:var(--navy)}
.price .tag{white-space:normal}
.price small{font:600 18px/1.3 var(--body);color:var(--mute);display:block;margin-top:8px}
.price .tag{display:inline-block;margin-bottom:14px;background:var(--orange);color:#fff;font:700 13px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;padding:9px 14px;border-radius:999px}
.links{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.links-top{margin-top:40px}
.fine{margin:18px 0 0;font-size:14.5px;color:var(--mute)}

.fees{list-style:none;margin:36px 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px}
.fees li{padding:22px 0 0;border-top:3px solid var(--blue)}
.fees li:first-child{border-top-color:var(--orange)}
.fee-tag{display:inline-block;font:700 12px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:12px}
.fees li:first-child .fee-tag{color:var(--orange)}
.fees h3{font-size:30px;text-transform:uppercase}
.fees .amt{margin:10px 0 0;font:700 clamp(34px,3.2vw,44px)/1 var(--head);color:var(--navy)}
.fees .amt small{display:block;margin:6px 0 0}
.fees .amt small{font:600 14px/1.2 var(--body);color:var(--mute)}
.fees p{margin:10px 0 0;color:var(--ink-2);font-size:15.5px}
.links.rv{margin-top:36px}
/* venue + contact */
.venue{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,5vw,72px);align-items:center}
.venue .big{font:700 clamp(40px,5vw,72px)/.95 var(--head);text-transform:uppercase;margin:0}
.venue .big em{font-style:normal;color:var(--orange)}
.vinfo{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 32px;margin:26px 0 0}
.vinfo dt{font:700 12.5px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.vinfo dd{margin:8px 0 0;font-size:17px;line-height:1.6;color:var(--ink-2)}
.vinfo dd a{color:var(--ink);font-weight:600;text-decoration:none}
.vinfo .maplink{display:inline-block;margin-top:10px;color:var(--orange-600);text-decoration:underline;text-underline-offset:3px}
.venue.one{grid-template-columns:minmax(0,1fr);max-width:1200px}
.map{display:block;position:relative;width:100%;border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#eee}
.map img{width:100%;height:auto;display:block;filter:saturate(.85);transition:transform .5s}
.map:hover img{transform:scale(1.03)}
.map-cap{position:absolute;left:12px;bottom:12px;background:rgba(26,26,26,.82);color:#fff;font-size:12.5px;padding:6px 10px;border-radius:999px}
.contact{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px;margin-top:40px}
.contact h3{font-size:26px;text-transform:uppercase;margin-bottom:10px}
.contact p{margin:0;color:var(--ink-2);line-height:1.7}
.contact a{color:var(--ink);font-weight:600}

/* footer */
.foot{background:var(--char-900);color:#bdbdbd;font-size:15px}
.fgrid{display:grid;grid-template-columns:1.3fr 1fr 1.1fr 1fr;gap:36px;padding-top:56px;padding-bottom:48px}
.foot h3{font-size:26px;text-transform:uppercase;color:#fff;margin:0 0 18px}
.foot p{margin:0 0 14px;line-height:1.7}
.foot p b{color:#fff;font-weight:600}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin:0 0 10px;padding-left:16px;position:relative}
.foot li::before{content:"";position:absolute;left:0;top:.62em;width:6px;height:6px;border-top:2px solid var(--orange);border-right:2px solid var(--orange);transform:rotate(45deg)}
.foot a{color:#e6e6e6;text-decoration:none}.foot a:hover{color:var(--orange)}
.foot .be{width:84px;height:auto;background:#fff;border-radius:8px;padding:6px;margin:0 0 14px}
.foot .flogo{height:40px;width:auto;margin-top:18px}
.social{display:flex;gap:10px;margin-top:6px}
.social a{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:#fff;color:var(--char)}
.social a:hover{background:var(--orange);color:#fff}
.social svg{width:18px;height:18px;fill:currentColor}
.foot .copy{border-top:1px solid rgba(255,255,255,.1);padding:16px 0}
.foot .copy .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px}

/* scroll reveal */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.rv.in{opacity:1;transform:none}
.hero .rv:nth-child(2){transition-delay:.1s}.hero .rv:nth-child(3){transition-delay:.2s}.hero .rv:nth-child(4){transition-delay:.3s}.hero .rv:nth-child(5){transition-delay:.4s}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* inner pages */
.page{padding:clamp(48px,6vw,80px) 0}
.page .prose{max-width:72ch}
.page h2{font-size:34px;text-transform:uppercase;margin:36px 0 12px}
.page ul{color:var(--ink-2);line-height:1.7}

@media (max-width:980px){
  .hero .wrap{grid-template-columns:1fr}.hero-right{order:-1;max-width:340px}
  .two,.fee,.venue{grid-template-columns:1fr}.sticky{position:static}
  .items,.contact{grid-template-columns:1fr 1fr}.fgrid{grid-template-columns:1fr 1fr}.fees{grid-template-columns:1fr 1fr}.themes{grid-template-columns:1fr 1fr 1fr}.timeline{grid-template-columns:1fr 1fr;gap:26px 0}.timeline::before{display:none}
  .facts .wrap{grid-template-columns:1fr 1fr}.facts div:nth-child(2){border-right:0}.facts div:nth-child(3){padding-left:0}.facts div:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width:720px){
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;flex-direction:column;align-items:stretch;padding:10px var(--gut) 18px;gap:0;border-bottom:1px solid var(--line);box-shadow:0 12px 30px rgba(15,47,92,.12)}
  .nav.open{display:flex}.nav a{padding:12px 0;border-bottom:1px solid var(--line)}.nav .btn{margin-top:14px}
  .burger{display:block}.brand .certin,.brand .sep{display:none}
  .items,.contact,.days,.themes,.fgrid,.vinfo,.fees{grid-template-columns:1fr}.hex-wrap{width:min(100%,260px)}.facts .wrap{grid-template-columns:1fr}.facts div{border-right:0;padding-left:0}.facts div+div{border-top:1px solid var(--line)}
}

/* schedule page */
.tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:36px 0 0;padding:6px;background:#fff;border:1px solid var(--line);border-radius:18px}
.tabs button{appearance:none;border:0;background:transparent;border-radius:13px;padding:14px 10px;cursor:pointer;font:700 clamp(15px,2.2vw,19px)/1.1 var(--head);text-transform:uppercase;color:var(--ink-2);text-align:center;transition:background .2s,color .2s}
.tabs button small{display:block;font:700 11.5px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--orange);margin-bottom:7px}
.tabs button[aria-selected="true"]{background:var(--navy);color:#fff}
.tabs button[aria-selected="true"] small{color:var(--orange)}
.tabs button:hover:not([aria-selected="true"]){background:var(--paper)}
.day{padding-top:36px}
.about-pic{margin-top:30px;border-radius:18px;width:100%;height:auto;box-shadow:0 18px 40px rgba(15,47,92,.18)}
.day h2{font-size:clamp(30px,4vw,44px);text-transform:uppercase;margin:0}
.day-p{margin:8px 0 0;color:var(--ink-2);font-size:17px}
.tba{margin:26px 0 0;padding:20px 22px;border-left:4px solid var(--blue);background:#fff;border-radius:0 12px 12px 0;color:var(--ink-2);font-weight:600}
.slots{list-style:none;margin:26px 0 0;padding:0}
.slots li{display:grid;grid-template-columns:84px minmax(0,1fr);gap:18px;padding:16px 0;border-top:1px solid var(--line)}
.slots li:last-child{border-bottom:1px solid var(--line)}
.slots time{font:700 22px/1.2 var(--head);color:var(--blue)}
.slots b{display:block;font-size:17.5px;color:var(--ink)}
.slots span{display:block;margin-top:3px;color:var(--mute);font-size:15px}
.no-js .day[hidden]{display:block}
@media (max-width:520px){.tabs{gap:4px;padding:4px}.tabs button{padding:12px 6px;border-radius:11px}.slots li{grid-template-columns:64px minmax(0,1fr);gap:12px}}
.hero-note{display:flex;align-items:center;gap:10px;margin:22px 0 0;font-size:15px;font-weight:600;color:#f3c7a6}
.hero-note .dot{width:10px;height:10px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 4px rgba(242,102,1,.25)}
.btn-glow{box-shadow:0 0 0 0 rgba(242,102,1,.55)}
@media (prefers-reduced-motion:no-preference){.btn-glow{animation:ring 2.4s ease-out infinite}.hero-note .dot{animation:pulse 2.4s ease-in-out infinite}}
@keyframes ring{0%{box-shadow:0 0 0 0 rgba(242,102,1,.55)}70%{box-shadow:0 0 0 14px rgba(242,102,1,0)}100%{box-shadow:0 0 0 0 rgba(242,102,1,0)}}
.nav .btn-nav{display:inline-flex;align-items:center;min-height:40px;padding:0 18px;margin-left:8px;border:0;border-radius:8px;background:var(--orange);color:#fff;font:700 14.5px/1 var(--body);letter-spacing:.02em;text-decoration:none;transition:background .2s}
.nav .btn-nav:hover{background:var(--orange-600);color:#fff;border-bottom-color:transparent}
@media (max-width:720px){.nav .btn-nav{margin:14px 0 0;justify-content:center;min-height:46px;border-bottom:0}}