:root {
  --bg: #04070b;
  --panel: #070b10;
  --text: #d1d5d8;
  --muted: #6d7277;
  --sub: #9ea2a6;
  --accent: #65d9df;
  --line: rgba(255, 255, 255, 0.12);
  --line-soft: rgba(255, 255, 255, 0.07);
  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --wrap: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- nav ---------- */
.nav {
  position: absolute; inset: 0 0 auto 0; z-index: 5;
}
.nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: 0.01em; color: var(--sub); text-decoration: none;
}
.brand::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.nav-links { display: flex; gap: 28px; font-size: 13px; }
.nav-links a { color: var(--sub); text-decoration: none; transition: color .15s; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links .cta { color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: min(92vh, 860px);
  display: flex; flex-direction: column; justify-content: flex-end;
  overflow: hidden;
  background: var(--bg) url("assets/hero.jpg") center 30% / cover no-repeat;
}
.hero::after { /* fade the streak into the page */
  content: ""; position: absolute; inset: auto 0 0 0; height: 30%;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}
/* interactive layers drawn by assets/neural-hero.js */
.hero .fx { position: absolute; inset: 0; width: 100%; height: 100%; display: block; pointer-events: none; }
.hero .fx-gl { opacity: 0; transition: opacity .4s ease; }
.hero .fx-gl.on { opacity: 1; }
.hero-inner { width: 100%; position: relative; z-index: 1; padding-top: 140px; padding-bottom: 56px; }
.kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: clamp(15px, 1.6vw, 19px); font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text); margin: 0 0 22px;
}
.kicker::before { content: ""; width: 28px; height: 1px; background: var(--accent); }
.hero h1 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(56px, 10vw, 128px);
  line-height: 0.98; letter-spacing: -0.02em;
  margin: 0 0 clamp(120px, 22vh, 240px);
  color: var(--text);
}
.hero h1 em { font-style: italic; color: var(--accent); }

.meta {
  display: grid; grid-template-columns: 1fr 1fr 1.6fr; gap: 24px;
  border-top: 1px solid var(--line); padding-top: 18px;
}
.meta dt { font-size: 13px; font-weight: 600; color: var(--sub); margin-bottom: 4px; letter-spacing: 0.01em; }
.meta dd { margin: 0; font-size: 19px; font-weight: 600; color: #e6e9eb; }
.hero .meta, .hero .hosts { text-shadow: 0 1px 10px rgba(2, 5, 8, 0.85), 0 0 2px rgba(2, 5, 8, 0.6); }
.hero .hosts { font-size: 14px; font-weight: 600; color: var(--text); }
.hero .hosts .label { color: var(--sub); }
.hero .host img { height: 17px; }

.hosts {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 26px;
  margin-top: 28px; font-size: 13px; color: var(--sub);
}
.hosts .label { color: var(--muted); }
.host { display: inline-flex; align-items: center; gap: 8px; }
.host img { height: 15px; width: auto; }

/* ---------- sections ---------- */
section.block { padding: clamp(64px, 10vw, 112px) 0; }
.eyebrow {
  font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 14px;
}
h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(38px, 5.5vw, 60px); line-height: 1.05; letter-spacing: -0.01em;
  margin: 0 0 20px;
}
h2 em { color: var(--accent); }
.lede { color: var(--sub); max-width: 620px; font-size: 17px; margin: 0; }

/* ---------- lineup ---------- */
.tier { margin-top: 48px; }
.tier-head {
  display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px;
  font-size: 13px; color: var(--sub);
}
.tier-head span { color: var(--muted); }
.grid {
  display: grid; grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr));
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  background: var(--line-soft); gap: 1px;
}
.cell { background: var(--panel); padding: 22px 20px 24px; min-height: 150px; }
.logo { height: 34px; display: flex; align-items: center; margin-bottom: 14px; }
.logo img { max-height: 30px; max-width: 100%; width: auto; }
.logo .wordmark { font-size: 20px; }
.cat { font-size: 12px; color: var(--muted); margin: 0 0 16px; }
.person + .person { margin-top: 12px; }
.person .name { font-size: 16px; color: var(--text); }
.person .role { font-size: 13px; color: var(--muted); }
.nw { white-space: nowrap; }
.person .role + .role { margin-top: 1px; }
.person .role b { font-weight: 500; color: var(--accent); }

/* keynote strip */
.keynotes {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px;
  margin-top: 44px; padding-top: 28px; border-top: 1px solid var(--line);
}
.keynotes .name { font-family: var(--serif); font-size: 30px; line-height: 1.1; }
.keynotes .org { font-size: 13px; color: var(--muted); margin-top: 6px; }
.keynotes .org + .org { margin-top: 2px; }
.keynotes .tag { font-size: 12px; color: var(--accent); margin-bottom: 8px; }

/* ---------- CTA band ---------- */
.band { border-top: 1px solid var(--accent); padding: 28px 0 0; display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.band h3 { font-family: var(--serif); font-weight: 400; font-size: clamp(32px, 4.5vw, 44px); color: var(--accent); margin: 0; line-height: 1.1; }
.band p { margin: 0; font-size: 14px; color: var(--muted); text-align: right; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  background: var(--accent); color: #031214; font-weight: 500; font-size: 14px;
  text-decoration: none; border: 0; cursor: pointer; font-family: inherit;
  transition: filter .15s, transform .15s;
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn[disabled] { opacity: .6; cursor: default; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); margin-top: 24px; }
footer .wrap { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding-top: 22px; padding-bottom: 40px; font-size: 13px; color: var(--muted); }
footer .hosts { margin-top: 0; }

/* ---------- collaborate page ---------- */
.page-head { padding-top: 150px; padding-bottom: 20px; position: relative; }
.page-head::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 360px; z-index: -1;
  background: url("assets/hero.jpg") center 55% / cover no-repeat;
  -webkit-mask-image: linear-gradient(to bottom, #000 30%, transparent);
          mask-image: linear-gradient(to bottom, #000 30%, transparent);
  opacity: .55;
}
.page-head h1 { font-family: var(--serif); font-weight: 400; font-size: clamp(52px, 8vw, 96px); line-height: 1; margin: 0 0 18px; letter-spacing: -0.02em; }
.page-head h1 em { color: var(--accent); }

.types { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line-soft); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-top: 44px; }
.type { background: var(--panel); padding: 26px 22px 28px; }
.type .num { font-size: 12px; color: var(--accent); margin-bottom: 18px; }
.type h3 { font-family: var(--serif); font-weight: 400; font-size: 30px; margin: 0 0 10px; line-height: 1.1; }
.type p { margin: 0; color: var(--sub); font-size: 14px; }

.form-wrap { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; align-items: start; }
form { display: grid; gap: 18px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
label.f { display: grid; gap: 7px; font-size: 13px; color: var(--sub); }
label.f .opt { color: var(--muted); }
input[type=text], input[type=email], input[type=url], textarea {
  width: 100%; font: inherit; font-size: 15px; color: var(--text);
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 14px; outline: none; transition: border-color .15s;
}
input:focus, textarea:focus { border-color: var(--accent); }
textarea { min-height: 130px; resize: vertical; }
fieldset { border: 0; padding: 0; margin: 0; }
legend { font-size: 13px; color: var(--sub); margin-bottom: 9px; padding: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span {
  display: inline-block; padding: 8px 14px; border-radius: 999px; font-size: 14px;
  border: 1px solid var(--line); color: var(--sub); cursor: pointer; user-select: none;
  transition: all .15s;
}
.chip input:checked + span { border-color: var(--accent); color: var(--accent); background: rgba(101, 217, 223, 0.08); }
.chip input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.form-foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.status { font-size: 14px; color: var(--sub); }
.status.ok { color: var(--accent); }
.status.err { color: #ff8a80; }
.hp { position: absolute; left: -9999px; }

.aside p { color: var(--sub); font-size: 15px; margin: 0 0 16px; }
.aside .small { font-size: 13px; color: var(--muted); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .grid { --cols: 2 !important; }
  .keynotes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .types { grid-template-columns: 1fr 1fr; }
  .form-wrap { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 620px) {
  .nav-links { gap: 18px; }
  .nav-links .hide-sm { display: none; }
  .meta { grid-template-columns: 1fr; gap: 14px; }
  .grid { --cols: 2 !important; }
  .cell { min-height: 0; padding: 18px 16px 20px; }
  .logo img { max-height: 24px; }
  .keynotes { grid-template-columns: 1fr; gap: 18px; }
  .keynotes .name { font-size: 24px; }
  .types { grid-template-columns: 1fr; }
  .row { grid-template-columns: 1fr; }
  .band p { text-align: left; }
}
.aside p.eyebrow { font-size: 12px; color: var(--accent); margin-bottom: 14px; }