:root {
  --green: #0f4f2f;
  --green-dark: #092f1c;
  --green-soft: #e8f1eb;
  --gold: #b9972f;
  --ink: #17211b;
  --muted: #5d6b63;
  --paper: #fbfaf6;
  --white: #ffffff;
  --line: #d8ded9;
  --blue: #234f68;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 14px 28px;
  background: rgba(251, 250, 246, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
  color: var(--green);
}

.brand-mark {
  width: 14px;
  height: 14px;
  background: var(--gold);
  border: 4px solid var(--green);
  border-radius: 50%;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--green);
}

.hero {
  position: relative;
  min-height: 620px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--green-dark);
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
  object-position: right center;
  left: auto;
  width: 48%;
  opacity: 0.94;
}

.hero-overlay {
  background: linear-gradient(90deg, rgba(9, 47, 28, 1) 0%, rgba(9, 47, 28, 1) 72%, rgba(9, 47, 28, 0.66) 88%, rgba(9, 47, 28, 0.14) 100%);
}

.hero-content {
  position: relative;
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  color: var(--white);
  padding: 76px 0 96px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: 58px;
  line-height: 1.05;
  font-weight: 900;
}

.hero-copy {
  max-width: 680px;
  margin: 24px 0 0;
  font-size: 19px;
  color: rgba(255, 255, 255, 0.88);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  background: var(--gold);
  color: var(--green-dark);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.button.full {
  width: 100%;
}

.notice-band {
  background: var(--green);
  color: var(--white);
  border-top: 4px solid var(--gold);
}

.notice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.notice-grid div {
  padding: 22px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

.notice-grid div:last-child {
  border-right: 0;
}

.notice-grid strong,
.notice-grid span {
  display: block;
}

.notice-grid strong {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.notice-grid span {
  margin-top: 4px;
  font-size: 22px;
  font-weight: 900;
}

.section {
  padding: 88px 0;
}

.section.soft {
  background: var(--green-soft);
}

.two-column,
.submission-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 56px;
  align-items: start;
}

.section h2 {
  margin: 0;
  color: var(--green);
  font-size: 34px;
  line-height: 1.18;
}

.section-copy p,
.submission-layout p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 17px;
}

.section-copy p:last-child,
.submission-layout p:last-child {
  margin-bottom: 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-heading.compact {
  margin-bottom: 24px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.topic-grid span,
.chair-grid article,
.committee-grid article,
.date-card,
.submission-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.topic-grid span {
  min-height: 76px;
  display: flex;
  align-items: center;
  padding: 16px;
  font-weight: 700;
}

.date-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.date-card {
  padding: 22px;
}

.date-card span {
  display: block;
  color: var(--gold);
  font-size: 22px;
  font-weight: 900;
}

.date-card h3 {
  margin: 12px 0 10px;
  color: var(--green);
  font-size: 18px;
}

.date-card p {
  margin: 0;
  color: var(--muted);
}

.split-band {
  background: var(--green-dark);
  color: var(--white);
}

.split-band h2,
.split-band .role {
  color: var(--white);
}

.split-band p {
  color: rgba(255, 255, 255, 0.78);
}

.role {
  margin: 8px 0 20px;
  color: var(--blue);
  font-weight: 800;
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.speaker-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.speaker-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.speaker-card h3 {
  margin: 0;
  color: var(--white);
  font-size: 26px;
  line-height: 1.12;
}

.speaker-card p {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
}

.speaker-card p:last-child {
  margin-bottom: 0;
}

.chair-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.committee-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.chair-grid article,
.committee-grid article {
  padding: 18px;
}

.chair-grid h3,
.committee-grid h3 {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 17px;
}

.chair-grid p,
.committee-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.check-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  border-radius: 50%;
}

.submission-panel {
  padding: 28px;
  align-self: stretch;
}

.submission-panel h3 {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 24px;
}

.submission-panel .button {
  margin-top: 24px;
}

.submission-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--muted);
}

.launch-note {
  padding: 14px 16px;
  background: #fff7df;
  border-left: 4px solid var(--gold);
  border-radius: 0 8px 8px 0;
  color: #694f13;
}

.organizers,
.partners {
  padding-top: 72px;
}

.organizers img,
.partners img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 24px;
}

.support-logo {
  width: min(320px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 24px 30px;
}

.support-logo img {
  width: 100%;
  border: 0;
  padding: 0;
}

.site-footer {
  background: var(--green-dark);
  color: var(--white);
  padding: 44px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 28px;
}

.site-footer h2,
.site-footer p {
  margin: 0;
}

.site-footer h2 {
  font-size: 22px;
}

.site-footer strong {
  display: block;
  margin-bottom: 8px;
  color: var(--gold);
}

.site-footer p {
  color: rgba(255, 255, 255, 0.74);
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 570px;
  }

  .hero-image {
    width: 100%;
    opacity: 0.38;
  }

  .hero-overlay {
    background: rgba(9, 47, 28, 0.86);
  }

  .hero h1 {
    font-size: 42px;
  }

  .two-column,
  .submission-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .notice-grid,
  .date-grid,
  .topic-grid,
  .speaker-grid,
  .committee-grid,
  .chair-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .container,
  .hero-content {
    width: min(100% - 28px, 1120px);
  }

  .site-header {
    padding: 12px 14px;
  }

  .site-nav {
    gap: 11px;
    font-size: 13px;
  }

  .hero {
    min-height: 600px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .section {
    padding: 60px 0;
  }

  .section h2 {
    font-size: 28px;
  }

  .notice-grid,
  .date-grid,
  .topic-grid,
  .speaker-grid,
  .committee-grid,
  .chair-grid {
    grid-template-columns: 1fr;
  }

  .speaker-card {
    grid-template-columns: 1fr;
  }

  .notice-grid div {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .notice-grid div:last-child {
    border-bottom: 0;
  }
}