:root {
  --navy: #003057;
  --ink: #1b252e;
  --muted: #5c6770;
  --paper: #fbfaf7;
  --white: #ffffff;
  --blue-soft: #e8eff4;
  --orange: #f7dfb2;
  --orange-dark: #9a4d00;
  --line: #d8dde1;
  --page: 1100px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { text-decoration-thickness: 2px; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  background: var(--white);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.hero,
main,
.footer-inner {
  width: min(calc(100% - 40px), var(--page));
  margin-inline: auto;
}

.top-block {
  color: var(--white);
  background: var(--navy);
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
}

.wordmark {
  margin-right: auto;
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.87rem;
  font-weight: 700;
}

.site-nav a { text-decoration: none; }
.site-nav a:hover,
.site-nav a:focus-visible { text-decoration: underline; }

.menu-button {
  display: none;
  color: var(--white);
  background: transparent;
  border: 0;
  font: inherit;
  font-weight: 700;
  padding: 10px 0 10px 18px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(240px, 1fr);
  color: var(--white);
}

.hero-main {
  /* min-height: 510px; */
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px 0 78px;
}

.eyebrow {
  margin: 0;
  color: var(--orange);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 800px;
  margin: 16px 0 26px;
  font-size: clamp(3.4rem, 7vw, 5.9rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.tagline {
  max-width: 720px;
  margin: 0;
  font-size: clamp(1.12rem, 2vw, 1.4rem);
}

.hero-note {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
  padding: 64px 0 78px 48px;
}

.hero-note p { margin: 0; }

.conference {
  padding-bottom: 22px;
  border-bottom: 3px solid var(--orange);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
}

.notice {
  margin-top: 18px;
  padding: 16px 20px;
  background: var(--orange);
  border-radius: 4px;
}

.section {
  padding: 76px 0;
  scroll-margin-top: 20px;
}

.section + .section { border-top: 1px solid var(--line); }

h2 {
  margin: 0 0 36px;
  color: var(--navy);
  font-size: clamp(2.35rem, 4.5vw, 3.8rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

.about {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.6fr);
  gap: 76px;
  align-items: start;
}

.about h2 { position: sticky; top: 24px; }

.body-copy p {
  margin: 0 0 1.15em;
  font-size: 1.13rem;
}

.body-copy p:last-child { margin-bottom: 0; }

.section-intro {
  max-width: 760px;
  margin: -16px 0 32px;
  font-size: 1.08rem;
}

.topics {
  background: var(--blue-soft);
  padding-inline: 38px;
  border-top: 0 !important;
  border-radius: 4px;
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 54px;
  margin: 0;
  padding-left: 22px;
}

.topic-list li { padding-left: 6px; }
.topic-list li::marker { color: var(--navy); }

.call-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.8fr);
  gap: 70px;
  align-items: start;
}

.small-note {
  color: var(--muted);
  font-size: 0.95rem !important;
}

.dates {
  overflow: hidden;
  background: #fff9ef;
  border: 1px solid #ead1a4;
  border-radius: 5px;
}

.dates h3 {
  margin: 0;
  padding: 17px 22px;
  background: var(--orange);
  font-size: 1.25rem;
}

.dates dl { margin: 0; }

.dates dl div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 19px 22px;
  border-top: 1px solid #eadfcf;
}

.dates dt { font-weight: 700; }
.dates dd { margin: 0; }
.dates dd span { color: var(--muted); font-size: 0.85rem; }

.people-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.people-grid article {
  min-height: 118px;
  padding: 22px;
  background: var(--blue-soft);
  border-radius: 4px;
}

.people-grid h3,
.organizer-grid h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
  line-height: 1.2;
}

.people-grid p,
.organizer-grid p { margin: 0; color: var(--muted); }

.schedule-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.schedule-row {
  display: grid;
  grid-template-columns: 170px 1fr;
  min-height: 50px;
  border-bottom: 1px solid var(--line);
}

.schedule-row:last-child { border-bottom: 0; }

.schedule-row > div { padding: 12px 17px; }
.schedule-row > div:first-child { font-variant-numeric: tabular-nums; }

.schedule-header {
  color: var(--white);
  background: var(--navy);
  font-weight: 700;
}

.schedule-row.highlight { background: #fff6e6; }

.organizer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 34px 22px;
}

.organizer-grid article { min-width: 0; }

.organizer-grid img {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: block;
  margin-bottom: 14px;
  object-fit: cover;
  background: var(--blue-soft);
  border-radius: 4px;
}

.organizer-grid article:nth-child(4) img { object-position: center; }
.organizer-grid article:nth-child(6) img { object-position: center 35%; }
.organizer-grid article:nth-child(3) img { object-position: center 18%; }
.organizer-grid article:nth-child(7) img { object-position: center 16%; }

.contact-strip {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin-top: 54px;
  padding: 22px 24px;
  background: var(--orange);
  border-radius: 4px;
}

.contact-strip p { margin: 0; }

.site-footer {
  width: 100%;
  margin: 0;
  color: var(--white);
  background: var(--navy);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  min-height: 220px;
  padding-block: 42px;
  font-size: 0.88rem;
  font-weight: 700;
}

.footer-inner p { margin: 0 0 4px; }

.whale-shark {
  width: min(260px, 34vw);
  height: auto;
  display: block;
  opacity: 0.82;
}

:focus-visible {
  outline: 3px solid var(--orange-dark);
  outline-offset: 3px;
}

@media (max-width: 860px) {
  .site-header { flex-wrap: wrap; }
  .menu-button { display: block; }

  .site-nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 0 16px;
  }

  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 8px 0; }

  .hero { grid-template-columns: 1fr; }
  .hero-main {
    /* min-height: 470px; */
    padding: 54px 0; }

  .hero-note {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    align-items: start;
    gap: 30px;
    padding: 0 0 48px;
  }

  .conference { padding: 0; border-bottom: 0; }

  .about,
  .call-layout { grid-template-columns: 1fr; }

  .about { gap: 18px; }
  .about h2 { position: static; }

  .people-grid,
  .organizer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 580px) {
  body { font-size: 16px; }

  .site-header,
  .hero,
  main,
  .footer-inner { width: min(calc(100% - 28px), var(--page)); }

  .hero-main {
    /* min-height: 430px; */
    padding: 42px 0; }
  .hero h1 { font-size: clamp(3rem, 14vw, 4.4rem); }

  .hero-note {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 0 0 32px;
  }

  .conference {
    padding-bottom: 15px;
    border-bottom: 3px solid var(--orange);
  }

  .section { padding: 58px 0; }
  h2 { margin-bottom: 28px; }

  .topics { padding: 42px 24px; }
  .topic-list { grid-template-columns: 1fr; gap: 16px; }

  .call-layout { gap: 38px; }
  .dates dl div { grid-template-columns: 1fr; gap: 3px; }

  .people-grid { grid-template-columns: 1fr; }
  .organizer-grid { gap: 28px 14px; }

  .schedule-row { grid-template-columns: 105px 1fr; }
  .schedule-row > div { padding: 11px; }

  .contact-strip,
  .footer-inner { flex-direction: column; align-items: flex-start; }

  .whale-shark {
    width: min(250px, 76vw);
    align-self: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}