:root {
  color-scheme: dark;
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-raised: #243044;
  --border: #2d3a4d;
  --text: #e8edf4;
  --muted: #9aa8bc;
  --accent: #e63946;
  --accent-hover: #ff4d5a;
  --accent-dim: #8b2635;
  --gold: #f4c542;
  --success: #3dd68c;
  --on-accent: #fff;
  --overlay: rgba(0, 0, 0, 0.55);
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
  --max-width: 960px;
  --nav-height: 3.25rem;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #faf7f2;
  --surface: #ffffff;
  --surface-raised: #fff8ee;
  --border: #e5ddd0;
  --text: #1a2332;
  --muted: #5c6b80;
  --accent: #c41e3a;
  --accent-hover: #a01830;
  --accent-dim: #f5d0d6;
  --gold: #b8860b;
}

@media (prefers-color-scheme: light) {
  :root[data-theme="auto"] {
    color-scheme: light;
    --bg: #faf7f2;
    --surface: #ffffff;
    --surface-raised: #fff8ee;
    --border: #e5ddd0;
    --text: #1a2332;
    --muted: #5c6b80;
    --accent: #c41e3a;
    --accent-hover: #a01830;
    --accent-dim: #f5d0d6;
    --gold: #b8860b;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--accent);
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  height: auto;
}

.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-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.site-nav-bar {
  position: relative;
  z-index: 103;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: var(--nav-height);
  padding: 0.5rem 1rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-raised);
  color: var(--text);
  cursor: pointer;
}

.icon-btn:hover {
  border-color: var(--accent);
}

.site-nav-toggle {
  display: none;
}

.site-nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
}

.site-nav-brand span {
  color: var(--gold);
}

.site-nav-brand-short {
  display: none;
}

.site-nav-end {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.site-nav-toggle-bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 18px;
}

.site-nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav.is-open .site-nav-toggle-bars span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav.is-open .site-nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.site-nav.is-open .site-nav-toggle-bars span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 101;
  border: 0;
  padding: 0;
  background: var(--overlay);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.site-nav.is-open .site-nav-backdrop {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.site-nav-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  z-index: 102;
  max-height: calc(100dvh - var(--nav-height));
  overflow-y: auto;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  transform: translateY(-0.5rem);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
}

.site-nav.is-open .site-nav-drawer {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

body.nav-open {
  overflow: hidden;
}

.site-nav-links {
  display: flex;
  flex-direction: column;
  padding: 0.25rem 1rem 1rem;
}

.site-nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 0.25rem;
  border-bottom: 1px solid var(--border);
}

.site-nav-links a:last-child {
  border-bottom: none;
}

.site-nav-links a:hover,
.site-nav-links a[aria-current="page"] {
  color: var(--accent);
}

.site-nav-links a[aria-current="page"] {
  font-weight: 600;
}

.site-nav-group {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
  margin-bottom: 0.35rem;
}

.site-nav-submenu {
  display: flex;
  flex-direction: column;
}

.site-nav-parent {
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 0.25rem;
  border-bottom: 1px solid var(--border);
}

.site-nav-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.site-nav-group .site-nav-parent:last-child,
.site-nav-submenu .site-nav-sublink:last-child {
  border-bottom: none;
}

.site-nav-sublink {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.55rem 0.25rem 0.55rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.site-nav-sublink:last-child {
  border-bottom: none;
}

.site-nav-sublink:hover,
.site-nav-sublink[aria-current="page"] {
  color: var(--accent);
}

.site-nav-sublink[aria-current="page"] {
  font-weight: 600;
}

@media (max-width: 879px) {
  .site-nav {
    background: var(--surface);
    backdrop-filter: none;
  }

  .site-nav-bar {
    background: var(--surface);
  }

  .site-nav.is-open {
    border-bottom-color: var(--border);
  }

  .site-nav-brand-full {
    display: none;
  }

  .site-nav-brand-short {
    display: inline;
  }

  .site-nav-toggle {
    display: inline-flex;
  }

  .site-nav-submenu {
    margin-left: 0.75rem;
    padding-left: 0.85rem;
  }

  .site-nav-links .site-nav-sublink {
    padding: 0.65rem 0.25rem 0.65rem 0.35rem;
    font-size: 0.9rem;
    color: var(--muted);
    border-bottom: none;
  }

  .site-nav-links .site-nav-parent {
    padding: 0.75rem 0.25rem;
    border-bottom: 1px solid var(--border);
  }
}

@media (min-width: 880px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 1.25rem;
    overflow: visible;
  }

  .site-nav-bar {
    display: contents;
  }

  .site-nav-end {
    order: 3;
  }

  .site-nav-brand {
    order: 1;
    white-space: nowrap;
  }

  .site-nav-drawer {
    display: contents;
    position: static;
    max-height: none;
    overflow: visible;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    background: transparent;
    border: 0;
    box-shadow: none;
  }

  .site-nav-backdrop {
    display: none !important;
  }

  body.nav-open {
    overflow: auto;
  }

  .site-nav-links {
    order: 2;
    flex: 1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.35rem 1rem;
    padding: 0;
    overflow: visible;
  }

  .site-nav-links a {
    padding: 0;
    font-size: 0.925rem;
    font-weight: 400;
    border-bottom: none;
    color: var(--muted);
  }

  .site-nav-links a[aria-current="page"] {
    font-weight: 600;
  }

  .site-nav-group {
    position: relative;
    align-items: stretch;
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
  }

  .site-nav-parent {
    padding: 0;
    font-size: 0.925rem;
    font-weight: 400;
    border-bottom: none;
    color: var(--muted);
  }

  .site-nav-parent:hover,
  .site-nav-group:hover .site-nav-parent,
  .site-nav-group.is-active .site-nav-parent,
  .site-nav-parent[aria-current="page"] {
    color: var(--accent);
  }

  .site-nav-group.is-active .site-nav-parent,
  .site-nav-parent[aria-current="page"] {
    font-weight: 600;
  }

  .site-nav-submenu {
    position: absolute;
    top: calc(100% + 0.35rem);
    right: 0;
    z-index: 110;
    min-width: 12rem;
    padding: 0.35rem;
    margin-left: 0;
    border-left: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-4px);
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s ease;
  }

  .site-nav-submenu::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -0.5rem;
    height: 0.5rem;
  }

  .site-nav-group:hover .site-nav-submenu,
  .site-nav-group:focus-within .site-nav-submenu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav-sublink {
    padding: 0.55rem 0.75rem;
    font-size: 0.875rem;
    border-bottom: none;
    border-radius: 6px;
    white-space: nowrap;
  }

  .site-nav-sublink:hover {
    background: var(--surface-raised);
  }
}

.theme-dropdown {
  position: relative;
}

.theme-menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  z-index: 110;
  min-width: 8.5rem;
  padding: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
}

.theme-menu-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
}

.theme-menu-item:hover {
  background: var(--surface-raised);
}

.theme-menu-item[aria-checked="true"] {
  color: var(--accent);
  font-weight: 600;
}

.theme-icon {
  display: block;
}

.page-wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
}

.hero {
  padding: 0 0 1rem;
}

.hero + .panel,
.hero + .lane-section {
  margin-top: 0;
}

.hero + p {
  margin-top: 0;
}

.home-intro {
  margin: 0 0 1.5rem;
  max-width: 42rem;
  line-height: 1.6;
}

.home-intro + .panel {
  margin-top: 0;
}

.hero-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--gold);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.event-summary {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--gold);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.event-summary-dates,
.event-summary-meta {
  margin: 0;
}

.event-summary-meta {
  margin-top: 0.35rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.15;
}

.hero-lead {
  margin: 0 0 1rem;
  font-size: 1.125rem;
  color: var(--muted);
}

.hero-body {
  margin: 0 0 1.5rem;
  max-width: 42rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

@media (max-width: 479px) {
  .cta-row {
    flex-direction: column;
  }

  .cta-row .btn {
    width: 100%;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--on-accent);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.panel {
  margin: 2rem 0;
  padding: 1.25rem 1.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.panel h3 {
  margin: 1.25rem 0 0.35rem;
  font-size: 1.05rem;
}

.panel p,
.panel li {
  color: var(--text);
}

.panel .muted {
  color: var(--muted);
}

.about-section {
  margin: 2rem 0;
}

.about-section h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.about-section p {
  margin: 0 0 1rem;
}

.about-section p:last-child {
  margin-bottom: 0;
}

.hero + .about-section {
  margin-top: 0;
}

.poster-wall {
  margin: 2.5rem 0;
}

.poster-wall h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.poster-wall .muted {
  color: var(--muted);
}

.poster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.poster-card {
  display: flex;
  flex-direction: column;
  margin: 0;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.poster-image {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: var(--surface);
}

.poster-caption {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.65rem 0.75rem;
}

.poster-year {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gold);
}

.poster-venue {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.35;
}

@media (min-width: 640px) {
  .poster-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
}

.lane-section {
  margin: 2.5rem 0;
}

@media (min-width: 768px) {
  .lane-section {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem 1.25rem;
  }

  .lane-header {
    grid-column: 1 / -1;
  }

  .lane-section .role-card {
    margin: 0;
    height: 100%;
  }
}

.lane-header h2 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.lane-header p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.role-card {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.role-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.role-card dl {
  margin: 0;
  display: grid;
  gap: 0.35rem;
}

.role-card dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.role-card dd {
  margin: 0 0 0.5rem;
}

.role-card .role-note {
  margin: 0.5rem 0 0;
  padding: 0.5rem 0.65rem;
  background: var(--notice-bg, rgba(154, 168, 188, 0.12));
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

.role-card.phase2 {
  border-style: dashed;
  opacity: 0.92;
}

.steps-list {
  padding-left: 1.25rem;
}

.steps-list li {
  margin: 0.35rem 0;
}

.co-chairs {
  display: grid;
  gap: 1.25rem 2rem;
}

@media (min-width: 640px) {
  .co-chairs {
    grid-template-columns: 1fr 1fr;
  }
}

.co-chair-name,
.co-chair-title {
  margin: 0;
  line-height: 1.25;
}

.co-chair-name {
  font-weight: 600;
  font-size: 1rem;
}

.co-chair-title {
  font-size: 0.95rem;
  color: var(--muted);
}

.faq-item {
  margin: 1rem 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.faq-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.faq-item p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  margin-top: 3rem;
  padding: 1.5rem 1.25rem 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 1.25rem;
  margin-bottom: 1rem;
}

.site-footer-nav a,
.site-footer-meta a {
  color: var(--text);
  text-decoration: none;
}

.site-footer-nav a:hover,
.site-footer-meta a:hover {
  color: var(--gold);
}

.site-footer-meta {
  margin: 0;
}

.sponsor-tier {
  margin: 2rem 0;
}

.sponsor-tier h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  color: var(--gold);
}

.sponsor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .sponsor-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
  }
}

.sponsor-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}

.sponsor-card:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.sponsor-card img {
  max-height: 72px;
  max-width: 100%;
  width: auto;
  object-fit: contain;
}

.build-subnav {
  margin-bottom: 0.75rem;
}

.build-subnav a {
  font-size: 0.9rem;
  text-decoration: none;
}

.error-panel {
  padding: 1rem;
  border: 1px solid var(--danger, #f87171);
  border-radius: var(--radius);
  color: var(--danger, #f87171);
}