:root {
  --bg-0: #040b1f;
  --bg-1: #071a3d;
  --bg-2: #0c2a5c;
  --ink: #eef4ff;
  --ink-2: #b9c8e4;
  --muted: #8193b5;
  --cyan: #3fd0ff;
  --cyan-2: #8fe6ff;
  --line: rgba(143, 230, 255, .16);
  --card: rgba(9, 27, 60, .84);
  --radius: 18px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg-0);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3 { line-height: 1.1; margin: 0; }

#sky {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
  background: radial-gradient(1200px 800px at 75% 10%, #123a7a 0%, transparent 60%),
              linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
}

/* ---------- Top bar ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(16px, 4vw, 40px);
  transition: background .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.topbar.scrolled {
  background: rgba(4, 11, 31, .94);
  border-bottom-color: var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: .02em; }
.brand-mark { width: 30px; height: 30px; animation: spin-slow 12s linear infinite; }
.nav { display: flex; gap: 6px; align-items: center; }
.nav a {
  text-decoration: none; font-size: .92rem; font-weight: 500; color: var(--ink-2);
  padding: 8px 12px; border-radius: 999px; transition: color .2s, background .2s;
}
.nav a:hover { color: var(--ink); background: rgba(255,255,255,.06); }
.nav a.nav-cta { color: #04122c; background: var(--cyan); font-weight: 700; }
.nav a.nav-cta:hover { background: var(--cyan-2); }
.hero-stage { display: flex; flex-direction: column; align-items: center; }
.takeoff-btn {
  display: inline-flex; align-items: center; gap: 9px;
  font: inherit; font-size: 1rem; font-weight: 700; letter-spacing: .02em; color: var(--ink);
  padding: 12px 24px 12px 18px; border-radius: 999px; cursor: pointer;
  margin-top: 8px; z-index: 2;
  opacity: 0; animation: fade-up .9s 1s forwards;
  background: rgba(63,208,255,.1); border: 1px solid rgba(63,208,255,.55);
  position: relative; transition: color .2s, border-color .2s, background .2s;
}
.takeoff-btn:hover { border-color: var(--cyan); background: rgba(63,208,255,.18); }
.takeoff-btn svg { width: 18px; height: 18px; fill: none; stroke: var(--cyan); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; transition: transform .4s; }
.takeoff-btn[aria-pressed="true"] svg { transform: rotate(180deg); } /* arrow points down: "Land" */
.takeoff-btn.hint::after {
  content: ""; position: absolute; inset: -4px; border-radius: inherit;
  border: 2px solid var(--cyan); animation: ping 1.8s ease-out infinite; pointer-events: none;
}

main, .footer { position: relative; z-index: 2; }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 110px clamp(16px, 4vw, 40px) 80px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  align-items: center;
  gap: 24px;
  position: relative;
}
.hosts {
  display: flex; align-items: center; gap: 18px;
  font-weight: 700; font-size: 1.05rem; letter-spacing: .01em;
  margin-bottom: 28px;
  opacity: 0; animation: fade-up .8s .1s forwards;
}
.host { display: flex; flex-direction: column; line-height: 1.25; text-decoration: none; }
.host small { font-size: .62rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.host.unipi img { height: 56px; width: auto; display: block; }
.host-sep { width: 1px; height: 48px; background: rgba(143,230,255,.3); }
.kaust-mark { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.3rem; letter-spacing: .04em; color: #fff; text-decoration: none; }
.kaust-mark img { height: 30px; width: auto; }

.perks {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px;
  opacity: 0; animation: fade-up .9s .9s forwards;
}
.perk {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  border: 1px solid rgba(143,230,255,.35); background: rgba(63,208,255,.08);
  font-size: .88rem; font-weight: 600; color: var(--ink);
}
.perk b { color: var(--cyan); letter-spacing: .06em; text-transform: uppercase; font-size: .8rem; }
.perk svg { width: 18px; height: 18px; fill: none; stroke: var(--cyan); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.title {
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -.02em;
  line-height: .9;
  font-size: clamp(3.4rem, 9vw, 7.4rem);
}
.title span { display: block; opacity: 0; animation: fade-up .9s forwards; }
.title .t1 { color: #fff; animation-delay: .2s; }
.title .t2 {
  animation-delay: .35s;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-2) 40%, #fff 50%, var(--cyan-2) 60%, var(--cyan) 100%);
  background-size: 250% 100%;
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  animation: fade-up .9s .35s forwards, shimmer 6s 1.5s linear infinite;
}
.tagline {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--ink-2);
  margin: 20px 0 32px;
  max-width: 28ch;
  opacity: 0; animation: fade-up .9s .5s forwards;
}
.eyebrow {
  display: inline-block;
  font-size: .75rem; font-weight: 700;
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--cyan);
}
.workshop { opacity: 0; animation: fade-up .9s .65s forwards; }
.workshop h2 { font-size: clamp(1.25rem, 2.2vw, 1.65rem); font-weight: 800; margin: 6px 0 4px; max-width: 26ch; }
.workshop p { margin: 0; color: var(--ink-2); }

.when {
  margin-top: 26px; padding-top: 22px; position: relative;
  opacity: 0; animation: fade-up .9s .8s forwards;
}
.when::before { content: ""; position: absolute; top: 0; left: 0; width: 56px; height: 3px; border-radius: 3px; background: var(--cyan); }
.date { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 900; text-transform: uppercase; letter-spacing: -.01em; }
.time { font-weight: 700; font-size: 1.05rem; }
.time .dot { color: var(--muted); margin: 0 6px; }
.accent { color: var(--cyan); }
.where { color: var(--muted); font-size: .92rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero .cta-row { opacity: 0; animation: fade-up .9s .95s forwards; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  font-weight: 700; font-size: .95rem; text-decoration: none;
  transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
}
.btn-primary { background: var(--cyan); color: #04122c; box-shadow: 0 8px 30px -8px rgba(63,208,255,.7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px -8px rgba(63,208,255,.9); background: var(--cyan-2); }
.btn-ghost { border: 1px solid rgba(143,230,255,.35); color: var(--ink); background: rgba(255,255,255,.03); }
.btn-ghost:hover { border-color: var(--cyan); background: rgba(63,208,255,.08); transform: translateY(-2px); }
.btn-lg { padding: 16px 28px; font-size: 1.05rem; }

.countdown {
  display: flex; gap: 10px; margin-top: 30px;
  opacity: 0; animation: fade-up .9s 1.1s forwards;
}
.countdown div {
  min-width: 70px; padding: 10px 12px; text-align: center;
  border: 1px solid var(--line); border-radius: 12px;
  background: rgba(8, 24, 56, .55);
}
.countdown b { display: block; font-size: 1.5rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.countdown span { font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }

/* ---------- Hero drone ---------- */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / .9;
  display: grid; place-items: center;
  perspective: 900px;
  --tx: 0; --ty: 0;
}
.rings {
  position: absolute; left: -6%; right: -6%; width: 112%;
  top: 34%;
  overflow: visible;
  transform: translate(calc(var(--tx) * -10px), calc(var(--ty) * -6px));
}
.ring { fill: none; stroke: var(--cyan); filter: drop-shadow(0 0 6px rgba(63,208,255,.9)); }
.ring.r1 { stroke-width: 2; stroke-dasharray: 260 40 60 40; opacity: .75; animation: dash 9s linear infinite; }
.ring.r2 { stroke-width: 1.5; stroke-dasharray: 120 30; opacity: .55; animation: dash 6s linear infinite reverse; }
.ring.r3 { stroke-width: 3; stroke-dasharray: 40 18; opacity: .9; animation: dash 4s linear infinite; }

.drone-wrap {
  width: 100%;
  position: relative;
  cursor: pointer;
  animation: appear 1s .2s both;
  transition: transform 2s cubic-bezier(.45, 0, .2, 1) .7s; /* take-off: props spool up first */
}
.drone {
  width: 100%; height: auto; display: block;
  filter: drop-shadow(0 30px 40px rgba(0, 0, 0, .55)) drop-shadow(0 0 30px rgba(63,208,255,.18));
  transform:
    translate(calc(var(--tx) * 18px), calc(var(--ty) * 12px))
    rotateX(calc(var(--ty) * -10deg))
    rotateY(calc(var(--tx) * 14deg))
    rotateZ(calc(var(--tx) * 6deg));
  transition: transform .25s ease-out;
  animation: hover 4s ease-in-out infinite;
}
.drone-wrap.roll .drone { animation: roll 1s cubic-bezier(.5,0,.3,1), hover 4s ease-in-out infinite; }
.led { animation: blink 1.6s ease-in-out infinite; }
.disc { transition: opacity .8s; }
.ring { transition: opacity 1s; }

/* Landed: sitting on the pad, props stopped, rings dimmed */
.hero-visual.landed .drone-wrap { transform: translateY(20%); transition: transform 2.2s cubic-bezier(.3, .5, .35, 1); }
.hero-visual.landed .drone { animation: none; }
.hero-visual.landed:not(.landing) .blades { animation-play-state: paused; }
.hero-visual.landed:not(.landing) .disc { opacity: 0; }
.hero-visual.landed:not(.landing) .led { animation: none; opacity: .25; }
.hero-visual.landed .ring { opacity: .22; animation-play-state: paused; }
.hero-visual.spooling .blades { animation-duration: .45s; }
.blades { transform-box: fill-box; transform-origin: center; animation: spin .16s linear infinite; }
/* Freeze the hero's animations while it is scrolled out of view */
.hero.paused *, .hero.paused *::before, .hero.paused *::after { animation-play-state: paused !important; }

.hud {
  position: absolute;
  font: 600 .72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .12em; color: var(--cyan-2);
  padding: 7px 10px; border: 1px solid rgba(143,230,255,.3); border-radius: 6px;
  background: rgba(4, 16, 40, .55);
  opacity: 0; animation: fade-in .8s 2s forwards;
}
.hud span { color: var(--muted); }
.hud-1 { top: 12%; left: 4%; }
.hud-2 { top: 20%; right: 0; }
.hud-3 { bottom: 12%; right: 10%; }

.scroll-hint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid rgba(143,230,255,.4); border-radius: 14px;
}
.scroll-hint span {
  position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px;
  border-radius: 2px; background: var(--cyan); animation: scroll-dot 1.8s infinite;
}

/* ---------- Flight path ---------- */
.flight-layer {
  position: absolute; left: 0; right: 0;
  top: 0; height: 0; /* set from script.js */
  pointer-events: none;
  z-index: 3;
}
#flight { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.flight-guide { fill: none; stroke: rgba(143,230,255,.14); stroke-width: 1.5; stroke-dasharray: 2 10; stroke-linecap: round; }
.flight-trail { fill: none; stroke: var(--cyan); stroke-width: 2.5; opacity: .5; stroke-linecap: round; }
#scout { position: absolute; left: 0; top: 0; width: 44px; height: 44px; margin: -22px 0 0 -22px; will-change: transform; }
.scout-bob { width: 100%; height: 100%; animation: bob 2.4s ease-in-out infinite; }
.scout-bob svg { width: 100%; height: 100%; display: block; filter: drop-shadow(0 6px 8px rgba(0,0,0,.45)); }

/* ---------- Sections ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 110px clamp(16px, 4vw, 40px);
  position: relative;
}
.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(1.9rem, 4vw, 3rem); font-weight: 900; letter-spacing: -.02em; margin-top: 10px; }
.muted { color: var(--muted); }

.about-lead { margin: 0; max-width: 820px; font-size: clamp(1.2rem, 2vw, 1.45rem); color: var(--ink); font-weight: 500; line-height: 1.5; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  position: relative; overflow: hidden;
  padding: 30px 28px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.card::after {
  content: ""; position: absolute; inset: auto -40% -60% auto; width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(63,208,255,.22), transparent 70%);
  transition: transform .5s;
}
.card:hover { transform: translateY(-6px); border-color: rgba(63,208,255,.5); box-shadow: 0 20px 50px -20px rgba(63,208,255,.4); }
.card:hover::after { transform: translate(-30px, -30px) scale(1.2); }
.card-icon { width: 52px; height: 52px; display: grid; place-items: center; border-radius: 14px; background: rgba(63,208,255,.1); border: 1px solid rgba(63,208,255,.3); margin-bottom: 22px; }
.card-icon svg { width: 30px; height: 30px; fill: none; stroke: var(--cyan); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.card-num { position: absolute; top: 22px; right: 26px; font-weight: 900; font-size: 2.6rem; color: rgba(143,230,255,.1); }
.card h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 10px; }
.card p { margin: 0; color: var(--ink-2); }

.timeline { list-style: none; margin: 0; padding: 0; position: relative; max-width: 820px; }
.timeline::before { content: ""; position: absolute; left: 86px; top: 12px; bottom: 12px; width: 2px; background: linear-gradient(var(--cyan), rgba(63,208,255,.1)); }
.timeline li { display: grid; grid-template-columns: 70px 1fr; gap: 40px; padding: 14px 0; position: relative; }
.timeline li::before {
  content: ""; position: absolute; left: 80px; top: 22px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg-0); border: 2px solid var(--cyan); box-shadow: 0 0 12px rgba(63,208,255,.8);
}
.timeline time { font-weight: 800; font-variant-numeric: tabular-nums; color: var(--cyan); padding-top: 12px; }
.timeline li > div {
  padding: 14px 20px; border-radius: 14px; border: 1px solid var(--line); background: var(--card);
}
.timeline h3 { font-size: 1.1rem; font-weight: 700; }
.timeline p { margin: 2px 0 0; color: var(--muted); font-size: .95rem; }
.timeline .is-break > div { border-style: dashed; background: rgba(63,208,255,.06); }
.badge-free {
  display: inline-block; vertical-align: middle; margin-left: 10px; padding: 3px 10px; border-radius: 999px;
  font-size: .7rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
  color: var(--bg-0); background: var(--cyan); box-shadow: 0 0 14px rgba(63,208,255,.5);
}

.venue-grid { max-width: 820px; }
.info { padding: 32px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--card); }
.info dl { margin: 0; display: grid; gap: 18px; }
.info dl > div { display: grid; grid-template-columns: 100px 1fr; gap: 16px; }
.info dt { font-size: .75rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); padding-top: 4px; }
.info dd { margin: 0; font-weight: 600; }
.info .cta-row { margin-top: 30px; }


.register {
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
  padding: clamp(28px, 5vw, 56px);
  border-radius: 26px;
  border: 1px solid rgba(63,208,255,.35);
  background:
    radial-gradient(600px 300px at 90% 0%, rgba(63,208,255,.22), transparent 70%),
    linear-gradient(135deg, rgba(14,46,100,.85), rgba(6,20,48,.85));
  box-shadow: 0 30px 80px -30px rgba(63,208,255,.35);
}
.register h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 900; margin: 8px 0 10px; }
.register p { margin: 0; color: var(--ink-2); max-width: 46ch; }

.footer {
  max-width: var(--maxw); margin: 0 auto;
  padding: 40px clamp(16px, 4vw, 40px) 60px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: .9rem;
}
.footer-logos { flex-basis: 100%; display: flex; align-items: center; gap: 36px; flex-wrap: wrap; margin-bottom: 18px; }
.footer-logos a { opacity: .9; transition: opacity .2s; }
.footer-logos a:hover { opacity: 1; }
.f-unipi { height: 64px; width: auto; display: block; }
.f-kaust img { height: 40px; }
.f-kaust { font-size: 1.6rem; }

.speakers { display: flex; flex-wrap: wrap; justify-content: center; gap: 20px; }
.speakers > .speaker { flex: 0 1 calc((100% - 60px) / 4); }
.speaker {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 30px 22px 26px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--card);
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.speaker:hover { transform: translateY(-6px); border-color: rgba(63,208,255,.5); box-shadow: 0 20px 50px -20px rgba(63,208,255,.4); }
.speaker-photo {
  position: relative; width: 136px; height: 136px; margin-bottom: 20px; border-radius: 50%;
  padding: 4px; background: conic-gradient(from 0deg, var(--cyan), rgba(63,208,255,.1) 40%, var(--cyan-2) 70%, var(--cyan));
}
.speaker:hover .speaker-photo { animation: spin 3s linear infinite; }
.speaker:hover .speaker-photo img, .speaker:hover .speaker-photo span { animation: spin 3s linear infinite reverse; }
.speaker-photo img, .speaker-photo span {
  display: block; width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--bg-0);
}
.speaker-photo.is-initials span {
  display: grid; place-items: center; background: linear-gradient(135deg, #12346f, #0a1d44);
  font-size: 2.2rem; font-weight: 800; letter-spacing: .04em; color: var(--cyan-2);
}
.speaker h3 { font-size: 1.15rem; font-weight: 800; }
.speaker-role { margin: 6px 0 0; font-weight: 600; font-size: .92rem; color: var(--ink); }
.speaker-aff { margin: 2px 0 14px; font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--cyan); }
.speaker-bio { margin: 0; font-size: .9rem; color: var(--ink-2); line-height: 1.55; flex: 1; }
.speaker-link {
  margin-top: 18px; font-size: .85rem; font-weight: 700; text-decoration: none; color: var(--cyan-2);
  padding: 6px 14px; border-radius: 999px; border: 1px solid rgba(143,230,255,.3); transition: border-color .2s, background .2s;
}
.speaker-link:hover { border-color: var(--cyan); background: rgba(63,208,255,.08); }
.speakers .reveal:nth-child(2) { transition-delay: .1s; }
.speakers .reveal:nth-child(3) { transition-delay: .2s; }
.speakers .reveal:nth-child(4) { transition-delay: .3s; }

.talks { display: grid; gap: 16px; }
.talk {
  border-radius: var(--radius); border: 1px solid var(--line); background: var(--card);
  scroll-margin-top: 80px; transition: opacity .8s ease, transform .8s ease, border-color .3s;
}
.talk:hover, .talk[open] { border-color: rgba(63,208,255,.5); }
.talk summary {
  list-style: none; cursor: pointer; position: relative;
  padding: clamp(18px, 2.6vw, 26px) clamp(56px, 7vw, 76px) clamp(18px, 2.6vw, 26px) clamp(20px, 3vw, 34px);
  border-radius: var(--radius);
}
.talk summary::-webkit-details-marker { display: none; }
.talk summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.talk summary::after {
  content: ""; position: absolute; right: clamp(22px, 3vw, 34px); top: 50%;
  width: 11px; height: 11px; margin-top: -9px;
  border-right: 2.5px solid var(--cyan); border-bottom: 2.5px solid var(--cyan);
  transform: rotate(45deg); transition: transform .3s;
}
.talk[open] summary::after { transform: translateY(5px) rotate(-135deg); }
.talk-content {
  display: grid; grid-template-columns: 1fr; gap: 28px;
  padding: 0 clamp(20px, 3vw, 34px) clamp(20px, 3vw, 34px);
}
.talk-content:has(.talk-figure) { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); align-items: start; }
.talk-figure { margin: 0; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
.talk-figure img { display: block; width: 100%; height: auto; }
.talk-speaker { display: block; margin: 0 0 8px; font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--cyan); }
.talk-speaker span { color: var(--muted); }
.talk h3 { font-size: clamp(1.2rem, 2.2vw, 1.5rem); font-weight: 800; line-height: 1.2; }
.talk-body > p { margin: 0 0 12px; color: var(--ink-2); max-width: 78ch; }
.talk-body > p:last-child { margin-bottom: 0; }
.talk-bio { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.talk-bio p { margin: 8px 0 0; font-size: .92rem; color: var(--ink-2); max-width: 78ch; }

.section-tight { padding-top: 60px; padding-bottom: 60px; }
.uses { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.use {
  position: relative; margin: 0; aspect-ratio: 16 / 10; overflow: hidden;
  border-radius: 14px; border: 1px solid var(--line); background: #0a1a3a;
}
.use video, .use img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .6s ease; }
.use:hover video, .use:hover img { transform: scale(1.06); }
.use img.kb { animation: kenburns 16s ease-in-out infinite alternate; }
.use:hover img.kb { animation-play-state: paused; }
.use figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 30px 14px 11px;
  background: linear-gradient(transparent, rgba(4, 11, 31, .9)); pointer-events: none;
}
.use figcaption b { display: block; font-size: .98rem; font-weight: 800; }
.use figcaption span { font-size: .8rem; color: var(--ink-2); }
.uses .reveal:nth-child(4n+2) { transition-delay: .08s; }
.uses .reveal:nth-child(4n+3) { transition-delay: .16s; }
.uses .reveal:nth-child(4n+4) { transition-delay: .24s; }
.credits { margin-top: 14px; font-size: .8rem; color: var(--muted); }
.credits summary { cursor: pointer; width: max-content; }
.credits ul { margin: 8px 0 4px; padding-left: 18px; columns: 2; column-gap: 32px; }
.credits a { color: var(--ink-2); }
.credits p { margin: 0; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
.cards .reveal:nth-child(2) { transition-delay: .12s; }
.cards .reveal:nth-child(3) { transition-delay: .24s; }

/* ---------- Keyframes ---------- */
@keyframes fade-up { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
@keyframes fade-in { to { opacity: 1; } }
@keyframes shimmer { to { background-position: -250% 0; } }
@keyframes dash { to { stroke-dashoffset: -800; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes spin-slow { to { transform: rotate(360deg); } }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
@keyframes scroll-dot { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }
@keyframes bob { 0%, 100% { transform: translateY(-3px); } 50% { transform: translateY(3px); } }
@keyframes ping { 0% { opacity: .9; transform: scale(1); } 100% { opacity: 0; transform: scale(1.35); } }
@keyframes kenburns { from { transform: scale(1) translate(0, 0); } to { transform: scale(1.12) translate(-2%, -1%); } }
@keyframes hover {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -16px; }
}
@keyframes appear { from { opacity: 0; } }
@keyframes roll {
  0% { rotate: 0deg; scale: 1; }
  40% { scale: .9; }
  100% { rotate: 360deg; scale: 1; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 96px; min-height: auto; }
  .hero-stage { order: 0; }
  .hero-visual { max-width: 520px; width: 100%; margin: 0 auto; aspect-ratio: 1 / .7; }
  .takeoff-btn { margin-top: 18px; }
  .hero-text { display: contents; }
  .hosts { order: -3; margin-bottom: 8px; }
  .perks, .held { order: 1; }
  .title { order: -2; }
  .tagline { order: -1; }
  .workshop, .when, .hero .cta-row, .countdown { order: 1; }
  .cards { grid-template-columns: 1fr; }
  .talk-content:has(.talk-figure) { grid-template-columns: 1fr; }
  .uses { grid-template-columns: repeat(2, 1fr); }
  .credits ul { columns: 1; }
  .speakers > .speaker { flex-basis: calc((100% - 20px) / 2); }
  .scroll-hint { display: none; }
  .hud-1 { top: 2%; } .hud-2 { top: 6%; } .hud-3 { bottom: 0; }
}
@media (max-width: 640px) {
  .host.unipi img { height: 44px; }
  .kaust-mark { font-size: 1.1rem; }
  .kaust-mark img { height: 24px; }
  .hosts { gap: 14px; }
  .speakers > .speaker { flex-basis: 100%; }
  .countdown div { min-width: 0; flex: 1; }
  .timeline::before { left: 6px; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; padding-left: 30px; }
  .timeline li::before { left: 0; top: 18px; }
  .timeline time { padding-top: 0; }
  .info dl > div { grid-template-columns: 1fr; gap: 2px; }
  .section { padding: 80px 16px; }
}

@media (max-width: 900px), (pointer: coarse) {
  .drone { filter: none; transition: none; }
  .ring { filter: none; }
  .ring.r3 { stroke-width: 3.5; }
  .hero-visual::before {
    content: ""; position: absolute; left: 10%; right: 10%; top: 35%; height: 45%;
    background: radial-gradient(closest-side, rgba(63,208,255,.22), transparent);
    pointer-events: none;
  }
  .title .t2 { animation: fade-up .9s .35s forwards; background-position: 30% 0; }
  .scout-bob svg { filter: none; }
}
@media (max-width: 640px) {
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001s !important; animation-iteration-count: 1 !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* Phones: video tile captions sit below the clip, one line each, so every tile is the same size */
@media (max-width: 640px) {
  .uses { gap: 10px; }
  .use { aspect-ratio: auto; display: flex; flex-direction: column; border-radius: 12px; }
  .use video, .use img { height: auto; aspect-ratio: 16 / 10; }
  .use figcaption { position: relative; z-index: 1; padding: 7px 9px 9px; background: rgba(9, 27, 60, .95); }
  .use figcaption b, .use figcaption span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .use figcaption b { font-size: .82rem; }
  .use figcaption span { display: block; font-size: .7rem; }
}

/* ---------- Post-event note ---------- */
.held {
  max-width: 52ch; margin: 20px 0 0; color: var(--ink-2); font-size: 1rem; line-height: 1.55;
  padding-left: 14px; border-left: 3px solid var(--cyan);
  opacity: 0; animation: fade-up .9s .9s forwards;
}

/* ---------- Photo carousel ---------- */
.carousel { position: relative; max-width: 1100px; margin: 0 auto; }
.carousel .track {
  display: flex; overflow-x: auto; scroll-snap-type: x mandatory; scroll-behavior: smooth;
  border-radius: var(--radius); border: 1px solid var(--line); background: var(--bg-0);
  scrollbar-width: none; outline: none;
}
.carousel .track::-webkit-scrollbar { display: none; }
.carousel .track:focus-visible { box-shadow: 0 0 0 2px var(--cyan); }
.carousel .slide { position: relative; flex: 0 0 100%; margin: 0; scroll-snap-align: center; aspect-ratio: 16 / 10; max-height: 76vh; }
.carousel .slide img { width: 100%; height: 100%; object-fit: cover; display: block; }
.carousel figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 22px 18px;
  background: linear-gradient(transparent, rgba(4, 11, 31, .88));
  font-weight: 600; font-size: 1rem; color: var(--ink);
}
.carousel .nav-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(143,230,255,.4);
  background: rgba(4, 11, 31, .7); color: var(--ink); font-size: 1.8rem; line-height: 1;
  display: grid; place-items: center; padding: 0 0 4px; cursor: pointer;
  transition: background .2s, border-color .2s;
}
.carousel .nav-btn:hover { background: rgba(63,208,255,.25); border-color: var(--cyan); }
.carousel .prev { left: 14px; }
.carousel .next { right: 14px; }
.carousel .dots { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.carousel .dots button {
  width: 9px; height: 9px; padding: 0; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(143,230,255,.28); transition: background .2s, transform .2s;
}
.carousel .dots button[aria-current="true"] { background: var(--cyan); transform: scale(1.35); }
@media (max-width: 640px) {
  .carousel .slide { aspect-ratio: 4 / 3; }
  .carousel figcaption { padding: 28px 14px 12px; font-size: .86rem; }
  .carousel .nav-btn { width: 38px; height: 38px; font-size: 1.5rem; }
  .carousel .prev { left: 8px; }
  .carousel .next { right: 8px; }
}