/* ==========================================================================
   ICACT 2026 — IEEE 3rd Intl. Conference on Advanced Computing Technologies
   Design language: engineering "spec-sheet" broadsheet · IEEE masterbrand blue
   Deliberately distinct: light split hero, ruled ledgers, square controls,
   Archivo + IBM Plex Sans + Space Mono. No animated hero, no ticker, no numbered kickers.
   ========================================================================== */

:root{
  --ieee:#00629B; --ieee-dark:#002B49; --ieee-mid:#004E7C; --ieee-bright:#0A7BC4;
  --sky:#4F9BD9; --sky-2:#8FC5EA; --sky-3:#BBD9EE;
  --ink:#0b1a27; --ink-2:#33475a; --muted:#64798b;
  --paper:#ffffff; --bg:#eaeff4; --panel:#f4f7fa; --tint:#e5eef6;
  --line:#d3dde6; --line-2:#c0cfdd; --rule:#0b1a27;
  --radius:6px; --maxw:1160px;
  --f-display:'Archivo','Segoe UI',system-ui,sans-serif;
  --f-body:'IBM Plex Sans','Segoe UI',system-ui,sans-serif;
  --f-mono:'Space Mono','Courier New',monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{margin:0;background:var(--bg);color:var(--ink-2);font-family:var(--f-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
img{max-width:100%;display:block;}
a{color:var(--ieee);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--ink);line-height:1.08;margin:0 0 .5em;font-weight:700;letter-spacing:-.015em;}
p{margin:0 0 1em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
em{font-style:normal;color:var(--ieee);}
::selection{background:var(--ieee);color:#fff;}

/* mono label with blue square marker */
.klabel{font-family:var(--f-mono);font-size:.74rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--ieee);display:inline-flex;align-items:center;gap:10px;}
.klabel::before{content:"";width:10px;height:10px;background:var(--ieee);display:inline-block;}
.klabel--light{color:var(--sky-2);}
.klabel--light::before{background:var(--sky-2);}

/* ---------- Buttons: square, uppercase, industrial ---------- */
.btn{display:inline-flex;align-items:center;gap:.55em;justify-content:center;font-family:var(--f-mono);font-weight:700;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;padding:14px 24px;border-radius:var(--radius);border:2px solid transparent;cursor:pointer;transition:background .15s,color .15s,border-color .15s;text-decoration:none;}
.btn:hover{text-decoration:none;}
.btn--solid{background:var(--ieee);color:#fff;}
.btn--solid:hover{background:var(--ieee-dark);}
.btn--outline{background:transparent;color:var(--ieee);border-color:var(--line-2);}
.btn--outline:hover{border-color:var(--ieee);background:var(--paper);}
.btn--light{background:#fff;color:var(--ieee);border-color:#fff;}
.btn--light:hover{background:var(--tint);border-color:var(--tint);}
.btn--outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
.btn--outline-light:hover{background:rgba(255,255,255,.12);}
.btn--lg{padding:16px 30px;font-size:.85rem;}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:var(--paper);border-bottom:2px solid var(--rule);}
.site-header__bar{height:4px;background:var(--ieee);}
.site-header__in{display:flex;align-items:center;gap:16px;height:70px;}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:none;}
.brand:hover{text-decoration:none;}
.brand__mark{width:38px;height:38px;}
.brand__txt{flex:none;}
.brand__txt b{display:block;font-family:var(--f-display);font-weight:800;font-size:1.1rem;color:var(--ink);letter-spacing:-.01em;line-height:1.05;white-space:nowrap;}
.brand__txt span{display:block;font-family:var(--f-mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);white-space:nowrap;margin-top:3px;}
.brand-div{width:1px;height:36px;background:var(--line-2);flex:none;}
.header-ieee{display:flex;align-items:center;flex:none;}
.header-ieee:hover{text-decoration:none;}
.header-ieee img{height:38px;width:auto;display:block;}
@media(max-width:1400px){.brand-div,.header-ieee{display:none;}}
.nav{display:flex;align-items:center;gap:2px;margin-left:auto;}
.nav a{font-family:var(--f-mono);font-size:.75rem;letter-spacing:.03em;text-transform:uppercase;font-weight:400;color:var(--ink-2);padding:9px 10px;text-decoration:none;white-space:nowrap;transition:color .15s;}
.nav a:hover{color:var(--ieee);text-decoration:none;}
.nav a.active{color:var(--ieee);font-weight:700;}
.nav .btn{margin-left:10px;padding:11px 20px;}
.nav a.btn--solid{color:#fff;}
.nav a.btn--solid:hover{color:#fff;background:var(--ieee-dark);}
.navtoggle{display:none;margin-left:auto;background:none;border:2px solid var(--rule);border-radius:var(--radius);width:46px;height:40px;cursor:pointer;color:var(--ink);}
.navtoggle svg{width:22px;height:22px;margin:auto;}
@media(max-width:1200px){
  .nav{position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:2px solid var(--rule);padding:10px 28px 20px;transform:translateY(-160%);transition:transform .3s ease;margin-left:0;}
  .nav.open{transform:translateY(0);}
  .nav a{padding:15px 6px;border-bottom:1px solid var(--line);font-size:.86rem;}
  .nav .btn{margin:14px 0 0;justify-content:center;}
  .navtoggle{display:flex;}
}

/* ---------- Announcement ---------- */
.annbar{background:var(--ieee-dark);color:#fff;font-size:.86rem;padding:9px 46px 9px 0;position:relative;font-family:var(--f-body);overflow:hidden;}
.annbar b{color:var(--sky-2);}
.annbar s{color:var(--sky-3);opacity:.8;}
.annbar a{color:#fff;font-weight:700;text-decoration:underline;margin-left:6px;}
.annbar__x{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--sky-3);font-size:1.3rem;line-height:1;cursor:pointer;z-index:2;}
.annbar--hide{display:none;}
/* Marquee: two copies of the message, track shifted by half its width so the
   loop is seamless. Pauses on hover/focus so the address stays readable. */
.annbar__viewport{overflow:hidden;}
.annbar__track{display:flex;width:max-content;animation:annbar-scroll 34s linear infinite;}
.annbar__item{white-space:nowrap;padding-left:5rem;}
.annbar:hover .annbar__track,.annbar:focus-within .annbar__track{animation-play-state:paused;}
@keyframes annbar-scroll{from{transform:translateX(0);}to{transform:translateX(-50%);}}
/* No motion: drop the duplicate and show the message as a centred static line. */
@media(prefers-reduced-motion:reduce){
  .annbar{padding-left:20px;text-align:center;}
  .annbar__track{animation:none;width:auto;justify-content:center;}
  .annbar__item{white-space:normal;padding-left:0;}
  .annbar__item[aria-hidden="true"]{display:none;}
}

/* ---------- Masthead (home hero): light, split spec-sheet ---------- */
.mast{background:var(--paper);border-bottom:2px solid var(--rule);position:relative;}
.mast__in{display:grid;grid-template-columns:1.5fr 1fr;gap:0;}
@media(max-width:900px){.mast__in{grid-template-columns:1fr;}}
.mast__lead{padding:64px 48px 60px 0;}
@media(max-width:900px){.mast__lead{padding:44px 0 34px;}}
.mast__eyebrow{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.04em;color:var(--muted);margin-bottom:26px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.mast__eyebrow a{color:var(--ieee);text-decoration:underline;}
.mast__title{font-family:var(--f-display);font-weight:800;font-size:clamp(2.6rem,7vw,5.2rem);line-height:.96;letter-spacing:-.03em;color:var(--ink);margin-bottom:.35em;text-transform:uppercase;}
.mast__title em{color:var(--ieee);}
.mast__sub{font-size:1.12rem;color:var(--ink-2);max-width:48ch;margin-bottom:30px;}
.mast__cta{display:flex;flex-wrap:wrap;gap:12px;}
/* right spec card */
.mast__card{border-left:2px solid var(--rule);padding:40px 0 40px 44px;display:flex;flex-direction:column;justify-content:center;}
@media(max-width:900px){.mast__card{border-left:none;border-top:2px solid var(--rule);padding:32px 0;}}
.spec{display:flex;justify-content:space-between;align-items:baseline;gap:14px;padding:15px 0;border-bottom:1px solid var(--line);}
.spec:first-child{padding-top:0;}
.spec__k{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);}
.spec__v{font-family:var(--f-display);font-weight:700;font-size:1.05rem;color:var(--ink);text-align:right;}
.count{display:flex;gap:8px;margin-top:22px;}
.count__u{flex:1;text-align:center;background:var(--ieee-dark);color:#fff;border-radius:var(--radius);padding:12px 4px;}
.count__u b{display:block;font-family:var(--f-display);font-weight:800;font-size:1.5rem;line-height:1;}
.count__u i{font-family:var(--f-mono);font-style:normal;font-size:.58rem;letter-spacing:.1em;text-transform:uppercase;color:var(--sky-2);margin-top:5px;display:block;}
.count__lead{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:20px;}

/* ---------- IEEE ribbon ---------- */
.ribbon{background:var(--ieee-dark);color:#fff;}
.ribbon .wrap{padding:54px 28px;text-align:center;}
.ribbon__spon{display:flex;flex-direction:column;align-items:center;gap:16px;}
.ribbon__lbl{font-family:var(--f-mono);font-size:.76rem;letter-spacing:.18em;text-transform:uppercase;color:var(--sky-2);margin:0;}
.ribbon__plate{background:#fff;border-radius:10px;padding:16px 26px;box-shadow:0 10px 28px rgba(0,0,0,.22);}
.ribbon__plate img{height:58px;width:auto;display:block;}
.ribbon__sect{font-family:var(--f-display);font-weight:800;font-size:1.5rem;letter-spacing:-.01em;color:#fff;margin:0;text-transform:uppercase;}
.ribbon__note{max-width:62ch;margin:26px auto 0;font-size:.95rem;color:var(--sky-3);}
.ribbon__note a{color:var(--sky-2);text-decoration:underline;}
.ribbon__index{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:22px;}
.ribbon__index-lbl{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--sky-2);margin-right:2px;}
.idx-plate{background:#fff;border-radius:8px;padding:9px 15px;display:flex;align-items:center;}
.idx-plate img{height:26px;width:auto;display:block;}

/* ---------- Blocks ---------- */
.blk{padding:80px 0;border-bottom:2px solid var(--rule);}
.blk--panel{background:var(--panel);}
.blk--ink{background:var(--ieee-dark);border-bottom:none;}
.blk__head{margin-bottom:36px;}
.blk__title{font-family:var(--f-display);font-weight:800;font-size:clamp(1.9rem,4.4vw,3rem);letter-spacing:-.02em;color:var(--ink);margin:16px 0 0;max-width:20ch;text-transform:uppercase;}
.blk__title--light{color:#fff;}
.lead{font-size:1.16rem;color:var(--ink-2);max-width:64ch;line-height:1.55;}

/* two-col intro */
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:start;}
@media(max-width:820px){.split{grid-template-columns:1fr;gap:24px;}}

/* stats strip */
.figs{display:grid;grid-template-columns:repeat(4,1fr);border:2px solid var(--rule);margin-top:40px;background:var(--paper);}
.figs>div{padding:26px 24px;border-right:1px solid var(--line);}
.figs>div:last-child{border-right:none;}
.figs b{display:block;font-family:var(--f-display);font-weight:800;font-size:2.4rem;color:var(--ieee);line-height:1;}
.figs span{display:block;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:10px;}
.figs .fig-xplore{height:34px;width:auto;max-width:100%;display:block;}
.figs-note{font-size:.8rem;color:var(--muted);margin-top:14px;max-width:80ch;}
@media(max-width:760px){.figs{grid-template-columns:1fr 1fr;}.figs>div:nth-child(2){border-right:none;}.figs>div:nth-child(1),.figs>div:nth-child(2){border-bottom:1px solid var(--line);}}

/* ---------- Directory list (explore) ---------- */
.dir{border-top:2px solid var(--rule);}
.dir__row{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:22px;padding:24px 6px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink);transition:padding .18s,background .18s;}
.dir__row:hover{background:var(--paper);padding-left:20px;padding-right:20px;text-decoration:none;}
.dir__tag{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ieee);width:104px;}
.dir__main b{font-family:var(--f-display);font-weight:700;font-size:1.35rem;display:block;letter-spacing:-.01em;}
.dir__main span{font-size:.96rem;color:var(--muted);}
.dir__go{font-family:var(--f-display);font-size:1.6rem;color:var(--line-2);transition:color .18s,transform .18s;}
.dir__row:hover .dir__go{color:var(--ieee);transform:translateX(5px);}
@media(max-width:640px){.dir__row{grid-template-columns:1fr auto;}.dir__tag{grid-column:1/-1;width:auto;}}

/* ---------- Schedule ledger (dates) ---------- */
.sched{width:100%;border-collapse:collapse;border:2px solid var(--rule);background:var(--paper);}
.sched td{padding:20px 22px;border-bottom:1px solid var(--line);vertical-align:top;}
.sched tr:last-child td{border-bottom:none;}
.sched tr:hover{background:var(--tint);}
.sched__date{width:220px;font-family:var(--f-mono);font-size:.94rem;font-weight:700;color:var(--ieee);white-space:nowrap;}
.sched__date s{color:var(--muted);font-weight:400;opacity:.7;}
.sched__evt b{font-family:var(--f-display);font-weight:700;font-size:1.12rem;color:var(--ink);display:block;}
.sched__evt span{font-size:.9rem;color:var(--muted);}
.sched--hot td{background:var(--tint);}
.sched--hot .sched__evt b{color:var(--ieee-dark);}
.tag-ext{font-family:var(--f-mono);font-size:.64rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:var(--ieee);border-radius:3px;padding:3px 8px;margin-left:8px;vertical-align:middle;}
.tag-ext--past{background:var(--muted);}
@media(max-width:600px){.sched td{display:block;}.sched__date{width:auto;border-bottom:none;padding-bottom:0;}}

/* ---------- Tracks (bordered grid) ---------- */
.tracks{display:grid;grid-template-columns:repeat(3,1fr);border:2px solid var(--rule);background:var(--paper);}
@media(max-width:820px){.tracks{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.tracks{grid-template-columns:1fr;}}
.track{padding:26px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);}
.track .n{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ieee);}
.track h3{margin:12px 0 8px;font-size:1.2rem;text-transform:none;letter-spacing:-.01em;}
.track p{font-size:.92rem;color:var(--muted);margin:0;}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;}
.chip{font-family:var(--f-mono);font-size:.76rem;background:var(--paper);border:1px solid var(--line-2);color:var(--ieee-mid);padding:7px 13px;border-radius:var(--radius);}

/* steps (cards) */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:2px solid var(--rule);background:var(--paper);}
@media(max-width:760px){.steps{grid-template-columns:1fr;}}
.step{padding:30px 26px;border-right:1px solid var(--line);}
.step:last-child{border-right:none;}
.step .n{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ieee);}
.step h3{margin:12px 0 8px;font-size:1.2rem;text-transform:none;}
.step p{font-size:.92rem;color:var(--muted);margin:0;}

/* callout */
.callout{background:var(--tint);border-left:4px solid var(--ieee);padding:18px 22px;margin:24px 0;font-size:.96rem;}
.callout b{color:var(--ieee-dark);}

/* indexing logo row (light backgrounds) */
.indexing{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:22px 0 4px;}
.indexing .lbl{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ieee);}
.indexing .plate{border:1px solid var(--line-2);border-radius:8px;padding:9px 15px;background:#fff;display:flex;align-items:center;}
.indexing .plate img{height:26px;width:auto;display:block;}

/* prose */
.prose{max-width:760px;}
.prose h2{margin-top:1.5em;font-size:1.55rem;text-transform:none;}
.prose h3{margin-top:1.3em;font-size:1.2rem;color:var(--ieee-dark);text-transform:none;}
.prose ul{padding-left:1.15em;}
.prose li{margin-bottom:.45em;}

/* page head (inner): flat navy */
.phead{background:var(--ieee-dark);color:#fff;padding:56px 0 50px;border-bottom:4px solid var(--ieee);}
.phead__crumb{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--sky-2);margin-bottom:16px;}
.phead h1{color:#fff;font-family:var(--f-display);font-weight:800;font-size:clamp(2rem,5.4vw,3.6rem);text-transform:uppercase;letter-spacing:-.02em;max-width:20ch;}
.phead p{color:var(--sky-3);max-width:60ch;font-size:1.08rem;margin:0;}

/* people */
.people{display:grid;grid-template-columns:repeat(3,1fr);border:2px solid var(--rule);background:var(--paper);}
@media(max-width:820px){.people{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.people{grid-template-columns:1fr;}}
.person{padding:24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);}
.person .role{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ieee);}
.person h3{margin:10px 0 3px;font-size:1.1rem;text-transform:none;}
.person .aff{font-size:.86rem;color:var(--muted);}
.tba{color:var(--muted);font-style:italic;font-weight:400;}

/* large TPC roster (multi-column) */
.tpc-roster{columns:3;column-gap:26px;border-top:2px solid var(--rule);padding-top:6px;}
@media(max-width:900px){.tpc-roster{columns:2;}}
@media(max-width:560px){.tpc-roster{columns:1;}}
.tpc-roster .m{break-inside:avoid;-webkit-column-break-inside:avoid;padding:9px 0;border-bottom:1px solid var(--line);}
.tpc-roster .m b{display:block;font-family:var(--f-display);font-weight:600;font-size:.9rem;color:var(--ink);line-height:1.25;}
.tpc-roster .m span{display:block;font-size:.79rem;color:var(--muted);line-height:1.3;margin-top:2px;}

/* leadership: 2-col pair layout so co-chairs align top/bottom; honorary spans full width */
.people--lead{grid-template-columns:1fr 1fr;}
.person--full{grid-column:1 / -1;}
@media(max-width:560px){.people--lead{grid-template-columns:1fr;}}

/* fee table */
.table-scroll{overflow-x:auto;}
.ftable{width:100%;border-collapse:collapse;border:2px solid var(--rule);background:var(--paper);}
.ftable th,.ftable td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line);border-right:1px solid var(--line);font-size:.94rem;}
.ftable th:last-child,.ftable td:last-child{border-right:none;}
.ftable th{background:var(--ieee-dark);color:#fff;font-family:var(--f-mono);font-weight:700;font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;}
.ftable tr:last-child td{border-bottom:none;}
.ftable td b{color:var(--ieee-dark);}
.ftable tbody tr:hover{background:var(--tint);}

/* contact grid */
.contact-cards{display:grid;grid-template-columns:repeat(2,1fr);border:2px solid var(--rule);background:var(--paper);}
@media(max-width:640px){.contact-cards{grid-template-columns:1fr;}}
.ccard{padding:26px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);}
.ccard .ic{font-size:1.4rem;}
.ccard h3{margin:10px 0 4px;font-size:1.08rem;text-transform:none;}
.ccard a{font-weight:700;}

/* CTA band: flat solid blue */
.cta-band{background:var(--ieee);color:#fff;padding:64px 0;text-align:center;}
.cta-band h2{color:#fff;font-size:clamp(1.8rem,4vw,2.8rem);text-transform:uppercase;max-width:22ch;margin:0 auto .5em;}
.cta-band p{color:#dcecf8;max-width:56ch;margin:0 auto 26px;}
.cta-band .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:var(--sky-3);padding:0;}
.site-footer__bar{height:4px;background:var(--ieee);}
.foot__top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:34px;padding:54px 0 34px;}
@media(max-width:820px){.foot__top{grid-template-columns:1fr;gap:26px;}}
.foot__brand .brand__txt b{color:#fff;}
.foot__brand p{font-size:.9rem;color:var(--sky-3);max-width:40ch;margin-top:14px;}
.foot__brand img.ieee{height:38px;margin-top:20px;}
.foot__col h4{color:#fff;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px;}
.foot__col a{display:block;color:var(--sky-3);font-size:.9rem;padding:5px 0;text-decoration:none;}
.foot__col a:hover{color:#fff;}
.foot__bot{padding:20px 0 34px;border-top:1px solid rgba(143,197,234,.18);font-family:var(--f-mono);font-size:.74rem;color:#6e93b0;line-height:1.7;}
.foot__bot a{color:var(--sky-2);}

/* reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease;transition-delay:var(--d,0s);animation:reveal-failsafe .01s linear 1.6s forwards;}
.reveal.in{opacity:1;transform:none;animation:none;}
/* failsafe: if JS never runs, content still appears after 1.6s (never blank) */
@keyframes reveal-failsafe{to{opacity:1;transform:none;}}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;animation:none;}}

/* utils */
.center{text-align:center;}
.mt0{margin-top:0;}