.ai4brain-page .theme-page-main {
  padding-top: 84px;
}
.ai4brain-page .ai4brain-hero {
  display: grid;
  min-height: calc(100svh - 84px);
  padding: clamp(28px, 4vh, 48px) 0 12px;
}
.ai4brain-page .ai4brain-hero > .container {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}
.ai4brain-page .ai4brain-kicker {
  margin-bottom: clamp(12px, 2vh, 22px);
}
.ai4brain-page .ai4brain-masthead h1 {
  font-size: clamp(4.5rem, 10vh, 8.3rem);
}
.ai4brain-page .ai4brain-intro {
  max-width: 740px;
  margin-top: clamp(16px, 2.6vh, 28px);
  font-size: clamp(1rem, 2vh, 1.25rem);
}
.ai4brain-page .ai4brain-visual {
  min-height: 0;
  margin: 0;
}

.ai4brain-page .ai4brain-visual img {
  width: min(46vh, 520px, 54vw);
  max-height: 48vh;
  object-fit: contain;
}

.ai4brain-page .ai4brain-orbit {
  width: min(48vh, 540px, 56vw);
}

.ai4brain-page .ai4brain-outline {
  font-size: clamp(7rem, 17vw, 15rem);
}

.challenge-launch {
  position: relative;
  padding: clamp(56px, 6vw, 88px) 0 clamp(64px, 7vw, 96px);
  overflow: hidden;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(circle at 8% 12%, rgba(0, 181, 226, 0.12), transparent 23%),
    radial-gradient(circle at 95% 78%, rgba(232, 119, 34, 0.09), transparent 22%),
    var(--bg);
}

.challenge-launch::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(0, 181, 226, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 181, 226, 0.06) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(to bottom, black, transparent 36%);
}

.challenge-launch .container {
  position: relative;
  z-index: 1;
}

.challenge-header {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  align-items: center;
  gap: clamp(32px, 5vw, 68px);
  padding-bottom: clamp(38px, 5vw, 60px);
}

.challenge-label,
.challenge-bonus-label {
  margin: 0 0 12px;
  color: var(--cyan);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.challenge-heading-copy h2 {
  max-width: 1050px;
  font-size: clamp(3rem, 5vw, 5.5rem);
  line-height: 0.96;
  text-transform: uppercase;
  text-wrap: balance;
}

.challenge-heading-copy h2 span {
  color: var(--orange);
}

.challenge-heading-copy > p:last-child {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.35rem);
  line-height: 1.55;
}

.challenge-actions {
  display: grid;
  gap: 14px;
}

.challenge-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 52px;
  padding: 12px 18px;
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.2;
  transition: transform 220ms var(--ease), box-shadow 220ms ease, background 220ms ease, border-color 220ms ease;
}

.challenge-button svg {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
}

.challenge-button-primary {
  background: var(--cyan);
  color: #00182a;
  box-shadow: 0 16px 34px rgba(0, 181, 226, 0.18);
}

.challenge-button-secondary {
  background: var(--surface);
  color: var(--text);
}

.challenge-button:hover,
.challenge-button:focus-visible {
  border-color: #33c5e8;
  background: #33c5e8;
  color: #00182a;
  box-shadow: 0 18px 38px rgba(0, 181, 226, 0.24);
  transform: translateY(-2px);
}

.challenge-deadline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 0;
  border-block: 1px solid var(--line);
}

.challenge-deadline > div {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 22px;
  min-height: 96px;
  padding: 18px clamp(16px, 2.5vw, 32px);
}

.challenge-deadline > div + div {
  border-left: 1px solid var(--line);
}

.challenge-deadline-index {
  color: var(--cyan);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 800;
  line-height: 1;
}

.challenge-deadline p {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
}

.challenge-deadline strong {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.challenge-deadline time {
  color: var(--text);
  font-family: var(--font-body);
  font-size: clamp(1.08rem, 1.8vw, 1.4rem);
  font-weight: 800;
}

.challenge-block {
  display: grid;
  grid-template-columns: minmax(220px, 0.3fr) minmax(0, 0.7fr);
  gap: clamp(30px, 5vw, 68px);
  padding: clamp(44px, 4.5vw, 60px) 0;
  border-top: 1px solid var(--line);
}

.challenge-section-heading h3 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 2.8vw, 3rem);
  font-weight: 400;
  line-height: 1;
  text-wrap: balance;
}

.challenge-section-heading > p {
  max-width: 330px;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.challenge-lead {
  max-width: 720px;
  margin: 0 0 28px;
  color: var(--text);
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.35;
}

.challenge-objectives {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
}

.challenge-objectives article {
  padding-top: 16px;
  border-top: 2px solid var(--cyan);
}

.challenge-objectives strong {
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.challenge-objectives p,
.challenge-capability p,
.challenge-capability small,
.challenge-responsibility-grid p,
.challenge-deliverables p,
.challenge-timeline article > div:last-child > p:last-child,
.challenge-rules-grid p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.challenge-capabilities {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-auto-flow: dense;
  gap: 12px;
}

.challenge-capability {
  position: relative;
  min-width: 0;
  padding: 26px 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(145deg, rgba(0, 181, 226, 0.07), transparent 48%), var(--bg-soft);
}

.challenge-capability-wide {
  grid-column: 1 / -1;
}

.challenge-capability > svg,
.challenge-responsibility-grid svg,
.challenge-rules-grid svg {
  width: 27px;
  height: 27px;
  margin-bottom: 22px;
  color: var(--cyan);
  stroke-width: 1.6;
}

.challenge-capability h4,
.challenge-bonus h4,
.challenge-timeline h4,
.challenge-rules-grid h4 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.challenge-capability p strong {
  color: var(--orange);
}

.challenge-capability-letter {
  position: absolute;
  top: 18px;
  right: 22px;
  color: rgba(0, 181, 226, 0.2);
  font-family: var(--font-body);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
}

.challenge-weights {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 20px;
}

.challenge-weights span {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px;
  border-top: 1px solid var(--orange);
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.3;
}

.challenge-weights b {
  color: var(--orange);
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 900;
}

.challenge-capability small {
  display: block;
  margin-top: 16px;
  font-size: 0.8rem;
}

.challenge-responsibility-grid,
.challenge-rules-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--line);
}

.challenge-responsibility-grid > div,
.challenge-rules-grid article {
  padding: clamp(22px, 3vw, 32px);
  background: var(--bg-soft);
}

.challenge-responsibility-grid svg,
.challenge-rules-grid svg {
  margin-bottom: 18px;
}

.challenge-responsibility-grid p {
  margin: 0;
}

.challenge-responsibility-grid strong {
  display: block;
  margin-bottom: 5px;
  color: var(--text);
}

.challenge-submission-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(240px, 0.75fr);
  gap: 22px;
}

.challenge-deliverables {
  margin: 0;
  padding: 0;
  list-style: none;
}

.challenge-deliverables li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.challenge-deliverables li:last-child {
  border-bottom: 1px solid var(--line);
}

.challenge-deliverables li > span {
  color: var(--orange);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 900;
}

.challenge-deliverables p {
  margin: 0;
}

.challenge-deliverables strong {
  display: block;
  margin-bottom: 3px;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.challenge-bonus {
  align-self: start;
  padding: 28px;
  border: 1px solid rgba(232, 119, 34, 0.5);
  border-radius: 10px;
  background: linear-gradient(145deg, rgba(232, 119, 34, 0.12), transparent 65%), var(--bg-soft);
}

.challenge-bonus-label {
  color: var(--orange);
}

.challenge-bonus ul {
  display: grid;
  gap: 13px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.challenge-bonus li {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
}

.challenge-bonus li::before {
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 8px;
  height: 1px;
  content: "";
  background: var(--orange);
}

.challenge-timeline {
  display: grid;
  gap: 12px;
}

.challenge-timeline article {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 24px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-soft);
}

.challenge-phase-marker {
  display: flex;
  flex-direction: column;
  padding-right: 22px;
  border-right: 1px solid var(--line);
  color: var(--cyan);
  font-family: var(--font-body);
  font-weight: 800;
  text-transform: uppercase;
}

.challenge-phase-marker span {
  font-size: 0.74rem;
  letter-spacing: 0.12em;
}

.challenge-phase-marker strong {
  font-size: 2.4rem;
  line-height: 1;
}

.challenge-phase-date {
  margin: 0 0 4px;
  color: var(--orange);
  font-weight: 700;
}

.challenge-scorecards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.challenge-scorecards > article {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-soft);
}

.challenge-scorecards header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 22px 26px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(110deg, rgba(0, 181, 226, 0.1), transparent 72%);
}

.challenge-scorecards header p,
.challenge-scorecards header strong {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 900;
}

.challenge-scorecards header p {
  font-size: 1rem;
}

.challenge-scorecards header strong {
  color: var(--cyan);
  font-size: 1.75rem;
  line-height: 1;
}

.challenge-scorecards ul {
  margin: 0;
  padding: 10px 26px 16px;
  list-style: none;
}

.challenge-scorecards li {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.challenge-scorecards li:last-child {
  border-bottom: 0;
}

.challenge-scorecards b {
  color: var(--text);
}

.challenge-rules-grid h4 {
  font-size: 1.2rem;
}

html[data-theme="light"] .challenge-button-primary {
  color: #fff;
}

html[data-theme="light"] .challenge-button-primary:hover,
html[data-theme="light"] .challenge-button-primary:focus-visible {
  color: #00182a;
}

@media (max-width: 991px) {
  .challenge-header,
  .challenge-block {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .challenge-block {
    gap: 24px;
  }

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

  .challenge-section-heading > p {
    max-width: 620px;
  }
}

@media (max-width: 767px) {
  .ai4brain-page .theme-page-main {
    padding-top: 84px;
  }

  .ai4brain-page .ai4brain-hero {
    min-height: calc(100svh - 84px);
    padding: clamp(22px, 4vh, 38px) 0 8px;
  }

  .ai4brain-page .ai4brain-kicker {
    margin-bottom: 12px;
  }

  .ai4brain-page .ai4brain-masthead h1 {
    font-size: clamp(3.8rem, 17vw, 5.4rem);
  }

  .ai4brain-page .ai4brain-intro {
    margin-top: 16px;
    font-size: 0.96rem;
  }

  .ai4brain-page .ai4brain-visual {
    min-height: 0;
  }

  .ai4brain-page .ai4brain-visual img {
    width: min(42vh, 420px, 92vw);
    max-height: 41vh;
  }

  .ai4brain-page .ai4brain-orbit {
    width: min(43vh, 430px, 92vw);
  }

  .challenge-launch {
    padding: 48px 0 64px;
  }

  .challenge-header {
    gap: 26px;
  }

  .challenge-heading-copy h2 {
    font-size: clamp(2.65rem, 11.5vw, 3.5rem);
  }

  .challenge-heading-copy > p:last-child {
    margin-top: 18px;
    font-size: 1rem;
  }

  .challenge-actions,
  .challenge-deadline,
  .challenge-capabilities,
  .challenge-objectives,
  .challenge-responsibility-grid,
  .challenge-submission-layout,
  .challenge-scorecards,
  .challenge-rules-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .challenge-button {
    width: 100%;
  }

  .challenge-deadline > div {
    min-height: 82px;
    padding-inline: 8px;
  }

  .challenge-deadline > div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .challenge-block {
    padding: 40px 0;
  }

  .challenge-section-heading h3 {
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .challenge-capability-wide {
    grid-column: auto;
  }

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

  .challenge-weights span:last-child {
    grid-column: 1 / -1;
  }

  .challenge-timeline article {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 22px;
  }

  .challenge-phase-marker {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    padding: 0 0 14px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .challenge-phase-marker strong {
    font-size: 2.3rem;
  }

}

@media (max-height: 720px) and (min-width: 768px) {
  .ai4brain-page .ai4brain-hero {
    padding-top: 22px;
  }

  .ai4brain-page .ai4brain-masthead h1 {
    font-size: clamp(4rem, 9vh, 5.5rem);
  }

  .ai4brain-page .ai4brain-intro {
    margin-top: 14px;
    font-size: 1rem;
  }

  .ai4brain-page .ai4brain-visual img {
    max-height: 42vh;
  }

  .ai4brain-page .ai4brain-orbit {
    width: min(43vh, 430px, 52vw);
  }
}

@media (prefers-reduced-motion: reduce) {
  .challenge-button {
    transition: none;
  }
}