/* Option B — "Night Skyline": cinematic, dark-first. Brand-guide shapes background in the hero with left-aligned content; one glowing timeline as the hero moment below the fold. Single dark theme by design. */
:root{
  --ink:#001326; --navy:#002d5b; --royal:#1a51a0; --sky:#47b2e2; --electric:#2053d1;
  --fg:#eef5fc; --soft:#a9c3dd; --dim:#6f8aa8; --glass:rgba(255,255,255,.06); --glass-line:rgba(255,255,255,.12);
  --f-en:"Mukta",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-ar:"Almarai","Mukta",system-ui,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;background:var(--ink)}
body{background:var(--ink);color:var(--fg);font-family:var(--f-en);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
html[lang=ar] body{font-family:var(--f-ar);font-size:16px;line-height:1.85}
a{color:inherit}
img{display:block;max-width:100%}
h1,h2,h3{margin:0;text-wrap:balance;line-height:1.1}
p{margin:0}
:focus-visible{outline:3px solid var(--sky);outline-offset:3px;border-radius:6px}
.wrap{max-width:1180px;margin:0 auto;padding-left:max(24px,env(safe-area-inset-left,0px));padding-right:max(24px,env(safe-area-inset-right,0px))}
@media(max-width:480px){.wrap{padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}}


/* header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:var(--ink)}
.hdr{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(0,19,38,.72);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border-bottom:1px solid var(--glass-line)}
.hdr .wrap{display:flex;align-items:center;gap:28px;padding-block:12px}
.brand img{height:42px;width:auto}
.nav{display:flex;gap:4px;margin-inline-start:auto;font-size:15px}
.nav a{text-decoration:none;color:var(--soft);padding:8px 14px;border-radius:999px;transition:color .2s,background .2s}
.nav a:hover{color:var(--fg);background:var(--glass)}
.lang{border:1px solid var(--glass-line);background:transparent;color:var(--fg);border-radius:999px;padding:7px 14px;font:600 14px var(--f-ar);cursor:pointer}
html[lang=ar] .lang{font-family:var(--f-en)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:999px;padding:15px 30px;font-weight:600;font-size:15px;letter-spacing:.06em;text-transform:uppercase;text-decoration:none;border:0;cursor:pointer;transition:transform .2s,box-shadow .25s,background .25s}
html[lang=ar] .btn{letter-spacing:0;text-transform:none;font-size:16px}
.btn--glow{background:linear-gradient(90deg,var(--electric),#2f86e6 60%,var(--sky));color:#fff;box-shadow:0 0 0 1px rgba(255,255,255,.18) inset,0 14px 40px -12px rgba(32,83,209,.9)}
.btn--glow:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(255,255,255,.3) inset,0 18px 50px -10px rgba(71,178,226,.85)}
.btn--line{border:1px solid var(--glass-line);color:var(--fg);background:var(--glass)}
.btn--line:hover{background:rgba(255,255,255,.12)}
.btn--sm{padding:9px 18px;font-size:13px}
.btn svg{width:18px;height:18px}
html[dir=rtl] .btn svg.arrow{transform:scaleX(-1)}
@media(max-width:1020px){.nav{display:none}.hdr .lang{margin-inline-start:auto}}

/* hero */
.hero{position:relative;overflow:hidden;padding-block:96px 104px;background:var(--ink)}
.hero::before{content:"";position:absolute;inset:0;background:url("../images/hero-bg.webp") right bottom/cover no-repeat,var(--navy)}
html[dir=rtl] .hero::before{transform:scaleX(-1)}
.hero::after{content:"";position:absolute;inset:auto 0 0;height:120px;background:linear-gradient(180deg,transparent,var(--ink));pointer-events:none}
.hero .wrap{position:relative;z-index:1;display:flex;flex-direction:column;align-items:flex-start;gap:26px}
.hero .wrap>*{max-width:640px}
.hero .slogan{max-width:none;letter-spacing:.2em}
.cd{text-align:center}
.btn{white-space:nowrap}
@media(max-width:480px){.hdr .btn--sm{display:none}.hero .slogan{letter-spacing:.12em;font-size:18px}}

.org{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--soft)}
.org img{height:44px;width:auto;border-inline-start:1px solid var(--glass-line);padding-inline-start:14px}
.hero-logo{width:min(440px,78vw);filter:drop-shadow(0 20px 50px rgba(71,178,226,.25))}
.slogan{font-size:clamp(20px,2.6vw,30px);font-weight:300;letter-spacing:.32em;text-transform:uppercase;color:var(--fg);display:flex;gap:.6em;flex-wrap:wrap}
.slogan span:nth-child(2){color:var(--sky)}
html[lang=ar] .slogan{letter-spacing:0;font-weight:700;gap:.4em;font-size:clamp(22px,3vw,34px)}
html[lang=ar] .slogan i{color:var(--sky);font-style:normal}
.when{display:flex;flex-wrap:wrap;gap:10px}
.chip{display:inline-flex;align-items:center;gap:10px;background:var(--glass);border:1px solid var(--glass-line);border-radius:999px;padding:9px 18px;font-size:15px;color:var(--fg)}
.chip svg{width:18px;height:18px;color:var(--sky)}
.countdown{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;width:min(520px,100%)}
.cd{background:linear-gradient(180deg,rgba(255,255,255,.09),rgba(255,255,255,.02));border:1px solid var(--glass-line);border-radius:16px;padding:14px 6px 10px}
.cd b{display:block;font-size:clamp(28px,4vw,42px);font-weight:300;line-height:1;font-variant-numeric:tabular-nums}
.cd span{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
html[lang=ar] .cd span{letter-spacing:0;font-size:13px}
.ctas{display:flex;flex-wrap:wrap;gap:14px}
@media(max-width:760px){.hero{padding-block:64px 80px}.hero::before{background-position:78% bottom}}

/* sections */
section.sec{padding-block:110px;position:relative}
.head{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;margin-bottom:60px}
.kicker{font-size:13px;letter-spacing:.3em;text-transform:uppercase;color:var(--sky);font-weight:500}
html[lang=ar] .kicker{letter-spacing:0;font-size:14px}
.head h2{font-size:clamp(36px,5vw,60px);font-weight:700;letter-spacing:-.02em}
html[lang=ar] .head h2{letter-spacing:0;line-height:1.35}
.head p{color:var(--soft);max-width:64ch}
@media(max-width:760px){section.sec{padding-block:76px}.head{margin-bottom:40px}}

/* about */
.about{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:64px;align-items:center}
.big8{position:relative;font-size:clamp(200px,28vw,380px);font-weight:800;line-height:.8;color:transparent;-webkit-text-stroke:2px rgba(71,178,226,.55);text-align:center;user-select:none}
.big8::after{content:"8";position:absolute;inset:0;color:transparent;background:linear-gradient(200deg,rgba(71,178,226,.35),rgba(32,83,209,0) 60%);-webkit-background-clip:text;background-clip:text;-webkit-text-stroke:0}
.big8 small{display:block;font-size:15px;letter-spacing:.3em;text-transform:uppercase;-webkit-text-stroke:0;color:var(--soft);font-weight:500;margin-top:18px}
html[lang=ar] .big8 small{letter-spacing:0}
.about-text{display:flex;flex-direction:column;gap:20px;color:var(--soft);max-width:64ch}
.about-text p:first-child{font-size:clamp(20px,2.2vw,25px);line-height:1.5;color:var(--fg);font-weight:400}
html[lang=ar] .about-text p:first-child{line-height:1.85;font-size:clamp(19px,2vw,23px)}
.about-text .kicker{margin-bottom:-6px}
.about-text h2{font-size:clamp(30px,3.6vw,44px);color:var(--fg);letter-spacing:-.01em}
@media(max-width:860px){.about{grid-template-columns:1fr;gap:20px}.big8{font-size:180px}}

/* agenda: glowing timeline */
#agenda{background:linear-gradient(180deg,var(--ink),#00183a 50%,var(--ink))}
.agenda{list-style:none;margin:0 auto;padding:0;max-width:880px;position:relative}
.agenda::before{content:"";position:absolute;top:8px;bottom:8px;inset-inline-start:130px;width:2px;background:linear-gradient(180deg,var(--sky),var(--electric) 60%,rgba(32,83,209,.1));box-shadow:0 0 18px rgba(71,178,226,.6)}
.ag{display:grid;grid-template-columns:130px minmax(0,1fr);position:relative;padding-block:14px}
.ag::before{content:"";position:absolute;inset-inline-start:124px;top:30px;width:14px;height:14px;border-radius:50%;background:var(--ink);border:2px solid var(--sky)}
.ag--key::before{background:var(--sky);box-shadow:0 0 0 6px rgba(71,178,226,.2),0 0 22px var(--sky)}
.ag-time{padding-inline-end:28px;text-align:end;padding-top:14px;display:flex;flex-direction:column;line-height:1.1}
.ag-time b{font-size:26px;font-weight:300;font-variant-numeric:tabular-nums}
.ag-time span{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
html[lang=ar] .ag-time span{letter-spacing:0;font-size:13px}
.ag-body{margin-inline-start:34px;padding:16px 22px;border-radius:16px;border:1px solid transparent;transition:background .25s,border-color .25s;min-width:0}
.ag:hover .ag-body,.ag--panel .ag-body{background:var(--glass);border-color:var(--glass-line)}
.ag h3{font-size:21px;font-weight:500}
html[lang=ar] .ag h3{font-size:19px;line-height:1.6}
.ag--key h3{color:var(--sky);font-weight:600}
.ag-sub{color:var(--soft);margin-top:4px}
.tag{font-style:normal;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--sky);border:1px solid rgba(71,178,226,.45);border-radius:999px;padding:2px 10px;margin-inline-start:10px;vertical-align:middle;white-space:nowrap}
html[lang=ar] .tag{letter-spacing:0;font-size:12px}
.panel{margin-top:14px;padding-top:14px;border-top:1px dashed var(--glass-line);display:grid;gap:6px}
.panel-l{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim);margin-top:6px}
html[lang=ar] .panel-l{letter-spacing:0;font-size:13px}
.panel ul{list-style:none;margin:0;padding:0;display:grid;gap:4px;color:var(--soft);font-size:15px}
@media(max-width:600px){
  .agenda::before{inset-inline-start:6px}
  .ag{grid-template-columns:1fr;padding-inline-start:30px}
  .ag::before{inset-inline-start:0;top:20px}
  .ag-time{text-align:start;flex-direction:row;gap:8px;align-items:baseline;padding:10px 0 0}
  .ag-body{margin-inline-start:0;padding:8px 0}
  .ag--panel .ag-body{padding:12px 14px}
}


/* agenda: closed by default, sessions open one by one on scroll */
.js-reveal .ag{overflow:hidden;max-height:0;opacity:0;padding-block:0;transform:translateY(-8px);transition:max-height .7s cubic-bezier(.2,.7,.2,1),opacity .5s ease .1s,padding .5s ease,transform .5s ease}
.js-reveal .ag.in{max-height:520px;opacity:1;transform:none}
.js-reveal .ag.in{padding-block:14px}
/* speakers */
.speakers{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.spk{background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.015));border:1px solid var(--glass-line);border-radius:22px;padding:28px 22px 26px;display:flex;flex-direction:column;align-items:center;text-align:center;gap:18px;transition:transform .3s,border-color .3s}
.spk:hover{transform:translateY(-4px);border-color:rgba(71,178,226,.45)}
.spk-photo{width:132px;height:132px;border-radius:50%;padding:3px;background:conic-gradient(from 210deg,var(--sky),var(--electric),var(--navy),var(--sky));display:grid;place-items:center}
.spk-photo span{width:100%;height:100%;border-radius:50%;background:radial-gradient(circle at 30% 25%,#0c3f7a,var(--ink));display:grid;place-items:center;font-size:36px;font-weight:300;color:var(--fg);letter-spacing:.06em}
.spk h3{font-size:19px;font-weight:600;line-height:1.3}
.spk-role{color:var(--sky);font-size:14px;margin-top:6px;font-weight:500}
.spk-org{color:var(--soft);font-size:14px}
.spk-mod{display:inline-block;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink);background:var(--sky);border-radius:999px;padding:2px 10px;margin-bottom:8px;font-weight:600}
html[lang=ar] .spk-mod{letter-spacing:0;font-size:12px}
@media(max-width:1000px){.speakers{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:440px){.speakers{gap:12px}.spk{padding:20px 12px}.spk-photo{width:96px;height:96px}.spk h3{font-size:16px}}

/* sponsors — mirrors the guide's lockup */
#sponsors{border-block:1px solid var(--glass-line);background:radial-gradient(70% 120% at 50% 0%,rgba(32,83,209,.18),transparent 70%)}
.sponsors{display:grid;grid-template-columns:repeat(6,minmax(0,1fr))}
.sp{margin:0;display:flex;flex-direction:column;align-items:center;gap:22px;padding:6px 16px;text-align:center;border-inline-start:1px solid var(--glass-line)}
.sp:first-child{border-inline-start:0}
.sp figcaption{font-size:13px;color:var(--soft);min-height:2.6em;display:flex;align-items:center}
.sp-logo{height:80px;display:grid;place-items:center;width:100%}
.sp-logo img{max-height:70px;max-width:100%;width:auto;object-fit:contain;opacity:.88;transition:opacity .2s}
.sp:hover img{opacity:1}
.sp--dta .sp-logo img{max-height:40px}
.sp--alrayan .sp-logo img{max-height:44px}
@media(max-width:980px){.sponsors{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:36px}.sp:nth-child(4){border-inline-start:0}}
@media(max-width:560px){.sponsors{grid-template-columns:repeat(2,minmax(0,1fr))}.sp:nth-child(odd){border-inline-start:0}.sp:nth-child(4){border-inline-start:1px solid var(--glass-line)}}

/* venue */
.venue{position:relative;border-radius:28px;overflow:hidden;min-height:460px;background:var(--navy);display:flex;align-items:flex-end;border:1px solid var(--glass-line)}
.venue::before{content:"";position:absolute;inset:0;background:radial-gradient(70% 90% at 0% 100%,rgba(0,19,38,.92),transparent 70%),url("../images/skyline.webp") right -40px bottom -60px/70% auto no-repeat,linear-gradient(160deg,var(--navy),var(--ink))}
html[dir=rtl] .venue::before{transform:scaleX(-1)}
.venue-in{position:relative;padding:48px;max-width:640px;display:flex;flex-direction:column;gap:18px}
.venue .kicker{margin-bottom:-6px}
.venue h2{font-size:clamp(34px,4.4vw,54px);font-weight:700;letter-spacing:-.02em}
html[lang=ar] .venue h2{letter-spacing:0;line-height:1.35}
.venue .hall{color:var(--sky);font-size:18px}
.venue p.txt{color:var(--soft)}
.venue .btn{align-self:flex-start}
@media(max-width:600px){.venue-in{padding:26px}.venue{min-height:0}}

/* register */
#register{text-align:center;background:
  radial-gradient(50% 60% at 50% 100%,rgba(32,83,209,.4),transparent 70%),var(--ink)}
.cats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;max-width:880px;margin:0 auto}
.cats button{display:flex;flex-direction:column;align-items:center;gap:10px;background:var(--glass);border:1px solid var(--glass-line);color:var(--soft);border-radius:20px;padding:28px 10px;font:500 18px var(--f-en);cursor:pointer;transition:all .25s}
html[lang=ar] .cats button{font-family:var(--f-ar)}
.cats button::before{content:"";width:12px;height:12px;border-radius:50%;border:2px solid var(--dim);transition:all .25s}
.cats button:hover{border-color:rgba(71,178,226,.4);color:var(--fg)}
.cats button[aria-selected=true]{background:linear-gradient(180deg,rgba(71,178,226,.22),rgba(32,83,209,.14));border-color:var(--sky);color:var(--fg)}
.cats button[aria-selected=true]::before{background:var(--sky);border-color:var(--sky);box-shadow:0 0 14px var(--sky)}
.reg-row{margin-top:36px;display:flex;flex-direction:column;align-items:center;gap:16px}
.reg-note{color:var(--dim);font-size:14px}
@media(max-width:560px){.cats{grid-template-columns:repeat(2,minmax(0,1fr))}}

footer{border-top:1px solid var(--glass-line);color:var(--dim);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center;padding-block:30px}
footer img{height:36px;width:auto;opacity:.85}

@media (prefers-reduced-motion:no-preference){
  .hero .wrap>*{animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
  .hero .wrap>*:nth-child(2){animation-delay:.1s}.hero .wrap>*:nth-child(3){animation-delay:.2s}.hero .wrap>*:nth-child(4){animation-delay:.28s}.hero .wrap>*:nth-child(5){animation-delay:.36s}.hero .wrap>*:nth-child(6){animation-delay:.44s}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@keyframes rise{from{transform:translateY(16px);opacity:.01}to{transform:none;opacity:1}}
@keyframes sweep{from{opacity:.65;transform:translateX(-2%)}to{opacity:1;transform:translateX(2%)}}