:root {
  --challenge-accent: #159c9c;
  --challenge-ink: #252727;
  --challenge-line: #d8e4e4;
}

body {
  margin: 0;
  color: var(--challenge-ink);
  background: #fff;
}

.challenge-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: center;
  padding: 1.25rem;
  background: var(--challenge-ink);
}

.challenge-nav a {
  color: #fff;
  font-weight: 700;
}

.challenge-nav a:hover,
.challenge-nav a[aria-current="page"] {
  color: #34cccc;
}

.challenge-page {
  max-width: 1060px;
  margin: auto;
  padding: 2rem;
}

.challenge-header {
  padding: 2rem 0;
  border-bottom: 3px solid var(--challenge-accent);
}

.challenge-header .title {
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.challenge-header .subtitle {
  margin-top: 1rem;
  line-height: 1.5;
}

.challenge-kicker {
  margin-bottom: 1rem;
  color: var(--challenge-accent);
  font-weight: 800;
}

.challenge-page a,
.challenge-footer a {
  color: #117e7e;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.section-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  padding: 1.5rem 0;
}

.challenge-section {
  padding: 1rem 0;
  border-bottom: 1px solid var(--challenge-line);
}

.challenge-section h2 {
  scroll-margin-top: 1rem;
}

.table-container {
  overflow-x: auto;
}

.challenge-section .table {
  font-size: 0.95rem;
}

.challenge-section .table th,
.challenge-section .table td {
  min-width: 120px;
}

.challenge-notice {
  padding: 1rem;
  border-left: 4px solid var(--challenge-accent);
  background: #eef8f8;
}

.challenge-footer {
  padding: 2rem;
  text-align: center;
  background: #eef8f8;
}

@media (max-width: 600px) {
  .challenge-page {
    padding: 1rem;
  }

  .challenge-header .title {
    font-size: 1.8rem;
  }

  .challenge-nav {
    justify-content: flex-start;
    font-size: 0.9rem;
  }
}

/* Track detail pages share the homepage palette without changing the leaderboard. */
.track-page {
  --challenge-accent: #34cccc;
  --challenge-line: #2a3c3c;
  --challenge-muted: #bfcaca;
  --challenge-surface: linear-gradient(120deg, #131b1b, #0a0c0c);
  margin: 0;
  color: #e0e8e8;
  background: #000;
  font-family: 'Chivo', sans-serif;
  font-size: 18px;
  line-height: 1.65;
}

.track-page--yellow {
  --challenge-accent: #ffc000;
  --challenge-line: #4b4020;
  --challenge-surface: linear-gradient(120deg, #1c190f, #0d0c08);
}

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

.track-page .challenge-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  justify-content: flex-start;
  align-items: center;
  gap: 0.6rem 1.25rem;
  padding: 1rem max(1.5rem, calc((100vw - 1100px) / 2 + 1.5rem));
  border-bottom: 1px solid #383e3e;
  background: #252727;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.track-page .challenge-nav a {
  text-decoration: none;
  font-weight: 500;
}

.track-page .challenge-nav a[aria-current="page"] {
  color: var(--challenge-accent);
}

.track-page .challenge-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-right: auto;
  color: #fff;
  white-space: nowrap;
}

.track-page .challenge-brand img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.track-page .challenge-page {
  max-width: 1100px;
  padding: 2.5rem 1.5rem 4rem;
}

.track-page .challenge-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  align-items: start;
  gap: 2rem;
  padding: 2rem;
  border: 1px solid var(--challenge-line);
  border-top: 3px solid var(--challenge-accent);
  border-radius: 12px;
  background: var(--challenge-surface);
}

.track-page .challenge-kicker {
  margin: 0 0 0.75rem;
  color: var(--challenge-accent);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.track-page h1,
.track-page h2,
.track-page h3 {
  color: #fff;
  font-family: 'Saira', sans-serif;
  font-weight: 500;
}

.track-page .challenge-header .title {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 3rem);
  line-height: 1.2;
}

.track-page .challenge-header .subtitle {
  margin: 0.75rem 0 0;
  color: #d3dddd;
  font-size: 1.375rem;
  line-height: 1.5;
}

.track-page .challenge-summary {
  margin: 1.25rem 0 0;
  color: var(--challenge-muted);
}

.track-page .challenge-association {
  margin: 1rem 0 0;
  color: #98a8a8;
  font-size: 0.9375rem;
}

.track-page .challenge-track-logo {
  display: block;
  width: 180px;
  max-width: 100%;
  height: auto;
}

.track-page .track-overview {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--challenge-line);
}

.track-page .track-overview dt {
  margin-bottom: 0.5rem;
  color: var(--challenge-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.track-page .track-overview dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
}

.track-page .section-links {
  gap: 0.6rem;
  padding: 1.75rem 0;
}

.track-page .section-links a {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--challenge-line);
  border-radius: 999px;
  color: #d3dddd;
  font-size: 0.9375rem;
  text-decoration: none;
}

.track-page .challenge-section {
  margin: 0 0 2rem;
  padding: 2rem;
  border: 1px solid var(--challenge-line);
  border-radius: 12px;
  background: var(--challenge-surface);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.track-page .challenge-section h2 {
  margin: 0 0 1.25rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--challenge-line);
  font-size: 1.875rem;
  line-height: 1.3;
  scroll-margin-top: 11rem;
}

.track-page .challenge-section p {
  margin: 0 0 1rem;
  color: var(--challenge-muted);
}

.track-page .challenge-heading-with-icon {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.track-page .challenge-heading-with-icon span {
  min-width: 0;
}

.track-page .challenge-inline-icon {
  display: block;
  flex: 0 0 auto;
  width: 3rem;
  height: 3rem;
  object-fit: contain;
}

.track-page .challenge-section p:last-child {
  margin-bottom: 0;
}

.track-page .track-organizer-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.track-page .track-organizer-avatar {
  display: block;
  width: 80px;
  height: 80px;
  border: 1px solid #3b4444;
  border-radius: 50%;
  overflow: hidden;
  transition: transform 180ms ease, filter 180ms ease;
}

.track-page .track-organizer-avatar img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.track-page strong {
  color: #e0e8e8;
  font-weight: 600;
}

.track-page .challenge-page a,
.track-page .challenge-footer a {
  color: var(--challenge-accent);
}

.track-page a:hover,
.track-page .challenge-page a:hover,
.track-page .challenge-footer a:hover {
  color: #ffc000;
}

.track-page a:focus-visible,
.track-page button:focus-visible,
.track-page .table-container:focus-visible {
  outline: 2px solid #ffc000;
  outline-offset: 4px;
}

.track-page .section-links a:hover,
.track-page .section-links a:focus-visible {
  border-color: var(--challenge-accent);
}

.track-page .table-container {
  max-width: 100%;
  margin: 1.5rem 0 0;
  border: 1px solid var(--challenge-line);
  border-radius: 8px;
  overflow-x: auto;
}

.track-page .table {
  width: 100%;
  min-width: 580px;
  margin: 0;
  border-collapse: collapse;
  color: var(--challenge-muted);
  background: #080e0e;
  font-size: 1rem;
  line-height: 1.6;
}

.track-page--yellow .table {
  background: #100e08;
}

.track-page .table th,
.track-page .table td {
  min-width: 120px;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--challenge-line);
  text-align: left;
  vertical-align: top;
}

.track-page .table thead th {
  color: var(--challenge-accent);
  background: rgba(255, 255, 255, 0.035);
  font-weight: 600;
}

.track-page .table tbody th {
  color: #e0e8e8;
  font-weight: 500;
}

.track-page .table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.025);
}

.track-page .table tbody tr:last-child > * {
  border-bottom: 0;
}

.track-page .table-container + p {
  margin-top: 1.25rem;
}

.track-page .challenge-notice {
  padding: 1rem 1.25rem;
  border: 1px solid var(--challenge-line);
  border-left: 3px solid var(--challenge-accent);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--challenge-muted);
  font-size: 1rem;
}

.track-page .submission-portal {
  --submission-portal-glow: rgba(52, 204, 204, 0.16);
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1.125rem 1.25rem;
  border: 1px solid var(--challenge-accent);
  border-left: 4px solid var(--challenge-accent);
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(115deg, #153d3d, #102222);
  font: inherit;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  text-align: left;
  text-decoration: none;
  transition: transform 180ms ease, filter 180ms ease, box-shadow 180ms ease;
}

.track-page .submission-portal:disabled {
  cursor: not-allowed;
  opacity: 1;
}

.track-page .challenge-page a.submission-portal,
.track-page .challenge-page a.submission-portal:hover {
  color: var(--submission-portal-ink, #fff);
}

.track-page .submission-portal-label {
  flex: 1 1 auto;
  min-width: 0;
}

.track-page .submission-portal .challenge-inline-icon {
  width: 3.5rem;
  height: 3.5rem;
}

.track-page .submission-portal-arrow {
  flex: 0 0 auto;
  color: #ffc000;
  font-size: 1.75rem;
  transition: transform 180ms ease;
}

.track-page .submission-portal:not(:disabled):focus-visible {
  outline: 2px solid var(--challenge-accent);
  outline-offset: 3px;
  filter: brightness(1.1);
  box-shadow: 0 6px 18px var(--submission-portal-glow);
}

.track-page--yellow .submission-portal {
  --submission-portal-glow: rgba(255, 192, 0, 0.16);
  --submission-portal-ink: #fff5d7;
  color: #fff5d7;
  background: linear-gradient(115deg, #4a370c, #2b230f);
}

.track-page .track-reference {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--challenge-line);
}

.track-page .track-reference > h3 {
  margin: 0 0 1rem;
  font-size: 1.375rem;
  line-height: 1.3;
  scroll-margin-top: 13rem;
}

.track-page .track-reference .detail-paper {
  margin-top: 1.25rem;
  padding-top: 0;
  border-top: 0;
}

.track-page .detail-paper {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--challenge-line);
}

.track-page .detail-paper-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.track-page .detail-paper-heading h4 {
  flex: 1 1 28rem;
  min-width: 0;
  margin: 0;
  color: #ffc000;
  font-family: 'Chivo', sans-serif;
  font-size: 1.25rem;
  line-height: 1.5;
}

.track-page .detail-paper-heading h4 a {
  color: inherit;
  text-decoration: none;
}

.track-page .detail-paper-heading h4:hover,
.track-page .detail-paper-heading h4 a:hover,
.track-page .detail-paper-heading h4 a:focus-visible {
  color: #fff;
}

.track-page .detail-paper-heading .detail-paper-venue {
  margin: 0;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  color: #080e0e;
  background: #ffc000;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.track-page .detail-paper-authors {
  margin-top: 0.875rem;
  font-size: 1rem;
}

.track-page .track-resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.track-page .track-resource-links a,
.track-page .track-resource-links button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.65rem 1.1rem;
  border: 1px solid #ffc000;
  border-radius: 6px;
  color: #ffc000;
  background: transparent;
  font: inherit;
  font-size: 1.125rem;
  line-height: 1.4;
  text-decoration: none;
}

.track-page .track-resource-links img {
  width: 28px;
  height: 28px;
  border-radius: 4px;
}

.track-page .track-resource-links button:disabled {
  border-color: var(--challenge-line);
  color: #98a8a8;
  cursor: default;
}

.track-page .challenge-footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid #252f2f;
  color: #98a8a8;
  background: #080b0b;
  font-size: 1rem;
}

.track-page .challenge-footer p {
  margin: 0 0 0.75rem;
}

@media (hover: hover) and (pointer: fine) {
  .track-page .submission-portal:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
    box-shadow: 0 6px 18px var(--submission-portal-glow);
  }

  .track-page .submission-portal:hover .submission-portal-arrow {
    transform: translateX(3px);
  }

  .track-page .challenge-section:not(.track-organizer-section):hover,
  .track-page .challenge-section:not(.track-organizer-section):focus-within {
    border-color: var(--challenge-accent);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  }

  .track-page .track-organizer-avatar:hover {
    transform: translateY(-2px);
    filter: brightness(1.05);
  }

  .track-page .track-resource-links a:hover {
    color: #080e0e;
    background: #ffc000;
  }
}

@media (max-width: 767px) {
  .track-page .challenge-nav {
    gap: 0.5rem 1rem;
    padding: 0.875rem 1.5rem;
  }

  .track-page .challenge-brand {
    flex-basis: 100%;
  }

  .track-page .challenge-page {
    padding: 1.5rem 1rem 2.5rem;
  }

  .track-page .challenge-header {
    grid-template-columns: minmax(0, 1fr) 96px;
    gap: 1.25rem;
    padding: 1.25rem;
  }

  .track-page .challenge-header-copy {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .track-page .challenge-track-logo {
    grid-column: 2;
    grid-row: 1;
    width: 96px;
  }

  .track-page .challenge-header::before {
    grid-column: 1;
    grid-row: 1;
    align-self: center;
    content: attr(data-track);
    color: var(--challenge-accent);
    font-family: 'Saira', sans-serif;
    font-size: 1.25rem;
  }

  .track-page .track-overview {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
  }

  .track-page .challenge-section {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .track-page .challenge-section h2 {
    font-size: 1.65rem;
    scroll-margin-top: 13rem;
  }

  .track-page .challenge-inline-icon {
    width: 2.5rem;
    height: 2.5rem;
  }

  .track-page .submission-portal .challenge-inline-icon {
    width: 3rem;
    height: 3rem;
  }

  .track-page .submission-portal {
    gap: 0.75rem;
    padding: 1rem;
    font-size: 1.25rem;
  }

  .track-page .submission-portal-arrow {
    display: none;
  }

  .track-page .challenge-header .subtitle {
    font-size: 1.125rem;
  }

  .track-page .track-resource-links a,
  .track-page .track-resource-links button {
    flex: 1 1 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .track-page .challenge-section,
  .track-page .track-organizer-avatar,
  .track-page .submission-portal,
  .track-page .submission-portal-arrow {
    transition: none;
  }

  .track-page .submission-portal:hover,
  .track-page .track-organizer-avatar:hover,
  .track-page .submission-portal:hover .submission-portal-arrow {
    transform: none;
  }
}

/* Method figures on track pages: the source images have white backgrounds, so frame them as light cards. */
.track-page .track-figure {
  margin: 1.5rem 0 1.25rem;
}

.track-page .track-figure img {
  display: block;
  width: 100%;
  height: auto;
  padding: 0.75rem;
  border: 1px solid var(--challenge-line);
  border-radius: 8px;
  background: #fff;
}

.track-page .track-detail-list {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.track-page .track-detail-list li + li {
  margin-top: 0.6rem;
}

.track-page .track-detail-list strong {
  color: #e0e8e8;
}

.track-page .track-subheading {
  margin: 2rem 0 0.5rem;
  font-size: 1.375rem;
  line-height: 1.3;
  scroll-margin-top: 13rem;
}