:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --bg-elevated: #ffffff;
  --text: #111827;
  --muted: #5b6475;
  --line: #d9dde7;
  --brand: #4f46e5;
  --brand-dark: #312e81;
  --brand-soft: #eef2ff;
  --accent: #06b6d4;
  --accent-soft: #ecfeff;
  --warning: #f59e0b;
  --shadow: 0 22px 70px rgba(17, 24, 39, 0.12);
  --radius: 24px;
  --container: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
code {
  background: rgba(79, 70, 229, 0.09);
  padding: 0.08rem 0.35rem;
  border-radius: 0.4rem;
  font-size: 0.94em;
}
.container { width: min(100% - 2rem, var(--container)); margin-inline: auto; }
.skip-link {
  position: absolute;
  left: -999px;
  top: 0.75rem;
  z-index: 999;
  padding: 0.75rem 1rem;
  background: var(--text);
  color: white;
  border-radius: 0.75rem;
}
.skip-link:focus { left: 0.75rem; }

main section, .section-heading-row { scroll-margin-top: 96px; }
#top { scroll-margin-top: 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(247, 248, 251, 0.78);
  border-bottom: 1px solid rgba(217, 221, 231, 0.72);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.65rem; font-weight: 800; letter-spacing: -0.03em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: white;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(79, 70, 229, 0.28);
}
.brand-text { font-size: 1.15rem; }
.nav-menu { display: flex; align-items: center; gap: 1.1rem; font-weight: 650; color: #293244; }
.nav-menu a { padding: 0.5rem 0.25rem; }
.nav-cta {
  padding: 0.58rem 0.95rem !important;
  border-radius: 999px;
  background: var(--text);
  color: white;
}
.nav-cta:hover { text-decoration: none; background: var(--brand-dark); }
.nav-toggle { display: none; background: transparent; border: 0; padding: 0.5rem; cursor: pointer; }
.nav-toggle span:not(.sr-only) { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 999px; }

.hero {
  position: relative;
  min-height: 720px;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 18% 22%, rgba(6, 182, 212, 0.32), transparent 28rem),
    radial-gradient(circle at 82% 18%, rgba(79, 70, 229, 0.38), transparent 26rem),
    linear-gradient(135deg, #070b16 0%, #111827 42%, #1e1b4b 100%);
}
.hero::before, .hero::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(165, 243, 252, 0.38);
  border-radius: 999px;
  pointer-events: none;
}
.hero::before {
  width: 33rem;
  height: 33rem;
  right: -9rem;
  top: 4rem;
}
.hero::after {
  width: 17rem;
  height: 17rem;
  right: 14rem;
  bottom: 6rem;
  box-shadow: 0 0 0 3rem rgba(6, 182, 212, 0.04);
}
.hero-image { display: none; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 11, 22, 0.88), rgba(20, 20, 70, 0.58) 54%, rgba(8, 11, 22, 0.18));
}
.hero-content { position: relative; z-index: 1; padding: 7rem 0 5.8rem; }
.eyebrow, .section-kicker, .track-label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 800;
}
.eyebrow { color: #bfdbfe; }
.hero h1 {
  max-width: 920px;
  margin: 0.75rem 0 1.1rem;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}
.hero h1 span { display: block; color: #a5f3fc; }
.hero-subtitle {
  max-width: 720px;
  margin: 0 0 2rem;
  font-size: clamp(1.2rem, 2.4vw, 1.9rem);
  color: rgba(255, 255, 255, 0.86);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 2.3rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 46px;
  padding: 0.78rem 1.08rem;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid transparent;
}
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.primary { background: var(--accent); color: #06111f; box-shadow: 0 18px 40px rgba(6, 182, 212, 0.25); }
.button.secondary { background: rgba(255, 255, 255, 0.15); color: white; border-color: rgba(255, 255, 255, 0.28); }
.button.ghost { background: var(--bg-elevated); color: var(--brand-dark); border-color: var(--line); box-shadow: 0 8px 25px rgba(17, 24, 39, 0.07); }
.button.disabled { opacity: 0.58; cursor: not-allowed; background: #e5e7eb; color: #4b5563; }
.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  max-width: 860px;
}
.hero-facts div {
  padding: 1rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.19);
}
.hero-facts strong { display: block; font-size: 0.82rem; color: #a5f3fc; }
.hero-facts span { display: block; margin-top: 0.25rem; color: rgba(255, 255, 255, 0.92); }

.section { padding: 6rem 0; }
.section-kicker { color: var(--brand); margin: 0 0 0.7rem; }
.section h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.03;
  letter-spacing: -0.055em;
}
.two-column { display: grid; grid-template-columns: 0.86fr 1.14fr; gap: min(8vw, 5rem); align-items: start; }
.lead-copy { font-size: 1.16rem; color: #344054; }
.lead-copy p:first-child { margin-top: 0; }
.muted { color: var(--muted); }

.lens { background: #101827; color: white; }
.lens .section-kicker { color: #a5f3fc; }
.lens-grid, .topic-grid, .track-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.lens-grid article {
  padding: 1.45rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.lens-grid h3, .topic-grid h3, .track-grid h3 { margin: 0 0 0.55rem; line-height: 1.18; }
.lens-grid p { color: rgba(255, 255, 255, 0.78); margin: 0; }

.topic-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  counter-reset: topic;
}
.topic-grid article {
  position: relative;
  overflow: hidden;
  min-height: 210px;
  padding: 1.35rem 1.25rem 1.25rem;
  border-radius: 22px;
  background:
    linear-gradient(180deg, var(--topic-soft), rgba(255, 255, 255, 0.96) 46%),
    var(--bg-elevated);
  border: 1px solid var(--line);
  border-color: color-mix(in srgb, var(--topic-accent) 28%, var(--line));
  box-shadow: 0 16px 42px rgba(17, 24, 39, 0.08);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.topic-grid article::before {
  counter-increment: topic;
  content: "0" counter(topic);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  margin-bottom: 1.05rem;
  border-radius: 0.9rem;
  background: var(--topic-accent);
  color: white;
  font-weight: 900;
  letter-spacing: -0.04em;
  box-shadow: 0 12px 26px color-mix(in srgb, var(--topic-accent) 28%, transparent);
}
.topic-grid article::after {
  content: "";
  position: absolute;
  inset: auto 1rem 0 1rem;
  height: 4px;
  border-radius: 999px 999px 0 0;
  background: var(--topic-accent);
}
.topic-grid article:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--topic-accent) 55%, var(--line));
  box-shadow: 0 22px 55px rgba(17, 24, 39, 0.12);
}
.topic-grid h3 { font-size: 1.08rem; color: #111827; }
.topic-grid p { margin: 0; color: #344054; font-size: 0.96rem; }
.topic-grid article:nth-child(1) { --topic-accent: #4f46e5; --topic-soft: rgba(79, 70, 229, 0.12); }
.topic-grid article:nth-child(2) { --topic-accent: #0891b2; --topic-soft: rgba(8, 145, 178, 0.13); }
.topic-grid article:nth-child(3) { --topic-accent: #7c3aed; --topic-soft: rgba(124, 58, 237, 0.12); }
.topic-grid article:nth-child(4) { --topic-accent: #db2777; --topic-soft: rgba(219, 39, 119, 0.11); }
.topic-grid article:nth-child(5) { --topic-accent: #ea580c; --topic-soft: rgba(234, 88, 12, 0.12); }
.topic-grid article:nth-child(6) { --topic-accent: #16a34a; --topic-soft: rgba(22, 163, 74, 0.12); }
.topic-grid article:nth-child(7) { --topic-accent: #0f766e; --topic-soft: rgba(15, 118, 110, 0.12); }
.topic-grid article:nth-child(8) { --topic-accent: #475569; --topic-soft: rgba(71, 85, 105, 0.12); }

.submissions { background: linear-gradient(180deg, #eef2ff, #f7f8fb); }
.section-heading-row { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.track-card {
  display: flex;
  flex-direction: column;
  padding: 1.45rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid rgba(79, 70, 229, 0.16);
  box-shadow: var(--shadow);
}
.track-card .track-label { color: var(--accent); margin: 0 0 0.35rem; }
.track-meta {
  margin: 0 0 0.9rem;
  display: inline-flex;
  width: fit-content;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 800;
  font-size: 0.88rem;
}
.track-card p { color: #344054; }
.track-card ul { margin: auto 0 0; padding-left: 1.1rem; color: var(--muted); }
.submission-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}
.submission-notes > div {
  padding: 1.3rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}
.submission-notes h3 { margin-top: 0; }
.submission-notes a:not(.button) { color: var(--brand-dark); font-weight: 800; text-decoration: underline; text-underline-offset: 0.18em; }

.dates { background: #ffffff; }
.timeline {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--line);
}
.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(8rem, 0.38fr) 1fr;
  gap: 1rem;
  padding: 0 0 1.3rem 1.4rem;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -0.55rem;
  top: 0.22rem;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft);
}
.timeline time { font-weight: 900; color: var(--brand-dark); }
.timeline span { color: #344054; }

.program-table {
  overflow: hidden;
  margin-top: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  box-shadow: 0 15px 50px rgba(17, 24, 39, 0.08);
}
.program-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1rem;
  padding: 1rem 1.2rem;
  border-top: 1px solid var(--line);
}
.program-row:first-child { border-top: 0; }
.program-row.header {
  background: #111827;
  color: white;
  font-weight: 900;
}
.program-row time { font-weight: 900; color: var(--brand-dark); }
.program-row.header span { color: white; }
.program-note { margin-top: 1rem; }

.organizers { background: #ffffff; }
.organizer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}
.organizer-card {
  display: flex;
  flex: 0 1 calc((100% - 4rem) / 5);
  max-width: calc((100% - 4rem) / 5);
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  box-shadow: 0 12px 40px rgba(17, 24, 39, 0.07);
  min-width: 0;
}
.organizer-photo-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background:
    repeating-linear-gradient(
      108deg,
      rgba(79, 70, 229, 0.15) 0,
      rgba(79, 70, 229, 0.15) 2px,
      transparent 2px,
      transparent 42px
    ),
    radial-gradient(circle at 75% 20%, rgba(6, 182, 212, 0.12), transparent 45%),
    linear-gradient(135deg, #eef2ff 0%, #edf6fb 100%);
}
.organizer-photo-link::before {
  content: "";
  position: absolute;
  inset: 10%;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.42);
  filter: blur(10px);
  pointer-events: none;
}
.organizer-photo-frame {
  position: relative;
  z-index: 1;
  display: block;
  flex: 0 0 auto;
  width: 72%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  border: 6px solid var(--brand);
  box-shadow:
    0 0 0 4px rgba(255, 255, 255, 0.9),
    0 18px 42px rgba(17, 24, 39, 0.12);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.organizer-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 30%;
}
.organizer-photo-link:hover {
  text-decoration: none;
  opacity: 1;
}
.organizer-photo-link:hover .organizer-photo-frame {
  transform: scale(1.025);
  box-shadow:
    0 0 0 4px rgba(255, 255, 255, 0.92),
    0 22px 50px rgba(17, 24, 39, 0.16);
}
.organizer-body { padding: 0.95rem; }
.organizer-body h3 { margin: 0 0 0.25rem; font-size: 1.08rem; line-height: 1.18; }
.affiliation { margin: 0; color: var(--brand-dark); font-weight: 800; font-size: 0.92rem; line-height: 1.35; }
.interests { color: var(--muted); font-size: 0.93rem; }
details { margin-top: 0.7rem; color: #344054; font-size: 0.93rem; }
summary { cursor: pointer; font-weight: 850; color: var(--text); }
.organizer-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 0.9rem; }
.organizer-links a {
  padding: 0.46rem 0.7rem;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 800;
  font-size: 0.9rem;
}
.organizer-links a:hover { text-decoration: none; background: #e0e7ff; }

.support { background: linear-gradient(180deg, #ffffff, #eef2ff); }
.support-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem;
  border-radius: calc(var(--radius) + 8px);
  background: var(--bg-elevated);
  border: 1px solid rgba(79, 70, 229, 0.16);
  box-shadow: 0 18px 60px rgba(17, 24, 39, 0.09);
}
.support-card p:not(.section-kicker) { margin: 0.85rem 0 0; color: var(--muted); font-size: 1.08rem; }
.support-link { flex: 0 0 auto; }

.contact { background: linear-gradient(135deg, #111827, #1e1b4b); color: white; }
.contact .section-kicker { color: #a5f3fc; }
.contact-card {
  padding: 2.2rem;
  border-radius: calc(var(--radius) + 8px);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.contact-card p { color: rgba(255, 255, 255, 0.78); max-width: 760px; }
.contact-email {
  display: inline-flex;
  margin-left: 0.25rem;
  padding: 0.25rem 0.55rem;
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.12);
  color: white;
  font-weight: 850;
  letter-spacing: 0.01em;
}
.contact-actions { display: none; }

.site-footer { padding: 2.3rem 0; background: #090d16; color: rgba(255, 255, 255, 0.78); }
.footer-grid { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 1rem; }
.footer-card {
  min-height: 132px;
  padding: 1.25rem;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.065);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-grid strong { color: white; display: block; font-size: 1.02rem; }
.footer-grid p { margin: 0.5rem 0 0; }
.footer-grid a { color: #a5f3fc; }

@media (max-width: 1180px) {
  .organizer-card { flex-basis: calc((100% - 2rem) / 3); max-width: calc((100% - 2rem) / 3); }
}
@media (max-width: 1020px) {
  .topic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lens-grid, .track-grid, .submission-notes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute;
    inset: 72px 1rem auto 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.8rem;
    border-radius: 20px;
    background: white;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 0.7rem 0.8rem; }
  .nav-cta { margin-top: 0.35rem; text-align: center; }
  .hero { min-height: 680px; }
  .hero-facts, .two-column, .contact-card, .footer-grid { grid-template-columns: 1fr; }
  .section-heading-row { align-items: start; flex-direction: column; }
  .support-card { align-items: stretch; flex-direction: column; }
  .contact-actions { justify-content: start; }
  .organizer-card { flex-basis: calc((100% - 1rem) / 2); max-width: calc((100% - 1rem) / 2); }
}
@media (max-width: 640px) {
  .organizer-photo-frame { width: 64%; }
  .section { padding: 4.25rem 0; }
  .hero-content { padding: 5rem 0 4rem; }
  .topic-grid, .lens-grid, .track-grid, .submission-notes { grid-template-columns: 1fr; }
  .organizer-card { flex-basis: 100%; max-width: 100%; }
  .program-row { grid-template-columns: 1fr; gap: 0.35rem; }
  .program-row.header { display: none; }
  .timeline li { grid-template-columns: 1fr; gap: 0.25rem; }
  .button { width: 100%; }
  .hero-actions { align-items: stretch; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}