.btn {
  display: inline-block;
  padding: 0.625rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.btn-filled {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.btn-filled:hover {
  background: var(--navy-mid);
  border-color: var(--navy-mid);
  color: #fff;
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: #fff;
  text-decoration: none;
}

.btn-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-light:hover {
  background: #fff;
  color: var(--navy);
  text-decoration: none;
}

.site-header:not(.site-header--dark) .header-nav .btn-light {
  color: var(--navy);
  border-color: var(--navy);
}

.site-header:not(.site-header--dark) .header-nav .btn-light:hover {
  background: var(--navy);
  color: #fff;
}

.text-link {
  display: inline-block;
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--navy);
  text-decoration: none;
}

.text-link:hover {
  color: var(--sky);
  text-decoration: none;
}

.text-link::after {
  content: " →";
}

/* Hero */

.hero-full {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-height) + var(--space-2xl)) var(--space-lg) var(--space-2xl);
  color: #fff;
}

.hero-full-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-full-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-full-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0, 16, 40, 0.92) 0%,
    rgba(0, 28, 61, 0.55) 50%,
    rgba(0, 28, 61, 0.35) 100%
  );
}

.hero-full-content {
  position: relative;
  z-index: 1;
  max-width: var(--grid-width);
  width: 100%;
  margin: 0 auto;
}

.hero-full-content h1 {
  max-width: 14ch;
  margin-top: var(--space-md);
}

.hero-full-content p {
  max-width: 32rem;
  margin-top: var(--space-lg);
  color: var(--text-on-dark-muted);
  font-size: 1.0625rem;
}

.hero-full-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.hero-kicker {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky-light);
}

.hero-credit {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-lg);
  z-index: 1;
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.45);
}

/* Sponsor carousel */

.sponsor-carousel {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: var(--space-md) 0 var(--space-lg);
}

.sponsor-carousel-label {
  margin: 0 auto var(--space-sm);
  max-width: var(--grid-width);
  padding: 0 var(--space-lg);
  text-align: center;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.sponsor-carousel-viewport {
  overflow: hidden;
}

.sponsor-carousel-track {
  display: flex;
  width: max-content;
  flex-shrink: 0;
  animation: sponsor-carousel-scroll var(--carousel-duration, 55s) linear infinite;
  will-change: transform;
}

.sponsor-carousel-set {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: var(--space-2xl);
  padding-right: var(--space-2xl);
  list-style: none;
}

.sponsor-carousel-set li {
  flex: 0 0 auto;
}

.sponsor-carousel-set img {
  display: block;
  height: 2.25rem;
  width: auto;
  max-width: 9rem;
  object-fit: contain;
  opacity: 0.72;
}

@keyframes sponsor-carousel-scroll {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(var(--carousel-shift, -50%), 0, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .sponsor-carousel-track {
    animation: none;
    flex-wrap: wrap;
    justify-content: center;
    width: auto;
    max-width: var(--grid-width);
    margin: 0 auto;
    gap: var(--space-xl);
  }

  .sponsor-carousel-set[aria-hidden="true"] {
    display: none;
  }
}

/* Page hero (inner pages) */

.page-hero {
  padding: calc(var(--header-height) + var(--space-2xl)) 0 var(--space-xl);
  background: var(--navy);
  color: #fff;
}

.page-hero h1 {
  max-width: 20ch;
}

.page-hero p {
  max-width: 36rem;
  margin-top: var(--space-md);
  color: var(--text-on-dark-muted);
}

/* Feature blocks (50Five-style) */

.feature-block {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border);
}

.feature-block:nth-child(even) {
  background: var(--bg-alt);
}

.feature-block-inner {
  display: grid;
  gap: var(--space-xl);
  align-items: center;
  max-width: var(--grid-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

@media (min-width: 56rem) {
  .feature-block-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .feature-block--reverse .feature-block-media {
    order: 2;
  }
}

.feature-block-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.feature-block-media figcaption {
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.section-num {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: var(--space-md);
}

.feature-block-content p {
  margin-top: var(--space-md);
  color: var(--text-muted);
  max-width: 32rem;
}

/* Content sections */

.content-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border);
}

.content-section h2 {
  margin-bottom: var(--space-lg);
}

.content-section p {
  color: var(--text-muted);
  max-width: 40rem;
}

.content-section p + p {
  margin-top: var(--space-md);
}

/* Team */

.team-list {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 48rem) {
  .team-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 64rem) {
  .team-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.team-member img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  margin-bottom: var(--space-md);
  background: var(--bg-alt);
}

.team-member h3 {
  font-size: 0.9375rem;
}

.team-role {
  font-size: 0.8125rem;
  color: var(--sky);
  margin: 0.25rem 0;
}

.team-bio {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Workflow */

.step-list {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

@media (min-width: 48rem) {
  .step-list {
    grid-template-columns: repeat(5, 1fr);
  }
}

.step-item {
  padding: var(--space-md) 0;
  border-top: 2px solid var(--navy);
}

.step-num {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.step-label {
  font-size: 0.9375rem;
  font-weight: 600;
}

/* Callout */

.callout {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--sky-pale);
  border-left: 3px solid var(--sky);
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* Events */

.event-types {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 48rem) {
  .event-types {
    grid-template-columns: repeat(2, 1fr);
  }
}

.event-type h3 {
  margin-bottom: var(--space-sm);
}

.event-type p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.calendar-section {
  margin-top: var(--space-xl);
}

.calendar-month {
  margin-bottom: var(--space-xl);
}

.calendar-month-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-md);
}

.calendar-event {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: var(--space-md);
  align-items: start;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.calendar-date-badge {
  text-align: center;
  line-height: 1.2;
}

.calendar-date-day {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--navy);
}

.calendar-date-month {
  display: block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  color: var(--text-muted);
}

.calendar-event-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

.calendar-event-detail {
  grid-column: 2 / -1;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-bottom: var(--space-sm);
}

.type-pill {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sky);
}

.calendar-empty {
  padding: var(--space-xl) 0;
  color: var(--text-muted);
}

.calendar-empty a {
  font-weight: 600;
}

.past-events-toggle summary {
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--navy);
  margin-top: var(--space-xl);
}

.past-event-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.past-event-date {
  min-width: 5.5rem;
  font-size: 0.8125rem;
}

/* Pillars */

.pillar-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 48rem) {
  .pillar-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar-card h3 {
  margin-bottom: var(--space-sm);
}

.pillar-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.pillar-card .section-num {
  margin-bottom: var(--space-sm);
}

/* Programme */

.programme-list {
  margin-top: var(--space-xl);
}

.programme-row {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 48rem) {
  .programme-row {
    grid-template-columns: 1fr 2fr;
    gap: var(--space-xl);
    align-items: baseline;
  }
}

.programme-row dt {
  font-weight: 600;
  font-size: 0.9375rem;
}

.programme-when {
  display: block;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

.programme-row dd {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.programme-note {
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Join */

.join-track {
  padding: var(--space-2xl) var(--space-lg);
}

.join-track--primary {
  background: var(--bg);
}

.join-track--primary .join-track-inner {
  max-width: var(--grid-width);
}

.join-track--research {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}

.join-track--research .join-track-inner {
  max-width: 26rem;
}

.join-track--sponsor {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}

.join-track-inner {
  max-width: 26rem;
  margin: 0 auto;
}

.join-faq .join-track-inner {
  max-width: 26rem;
}

.join-track-intro {
  color: var(--text-muted);
  margin-top: var(--space-md);
}

.join-block {
  margin-top: var(--space-xl);
}

.join-block h3 {
  margin-bottom: var(--space-sm);
}

.join-block p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

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

.faq-item summary {
  padding: var(--space-md) 0;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-answer {
  padding-bottom: var(--space-md);
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.sponsor-logos {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.sponsor-logo-placeholder {
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg);
}

.join-contact {
  padding: var(--space-xl) 0;
  text-align: center;
  background: var(--navy);
  color: var(--text-on-dark-muted);
}

.join-contact h2 {
  color: #fff;
  font-size: 1.25rem;
}

.join-contact a {
  color: var(--sky-light);
}

.cta-strip {
  padding: var(--space-2xl) 0;
  background: var(--navy);
  color: #fff;
  text-align: center;
}

.cta-strip h2 {
  color: #fff;
}

.cta-strip p {
  max-width: 32rem;
  margin: var(--space-md) auto 0;
  color: var(--text-on-dark-muted);
}

.cta-strip .btn-filled {
  margin-top: var(--space-lg);
  background: #fff;
  color: var(--navy);
  border-color: #fff;
}

.cta-strip .btn-filled:hover {
  background: var(--sky-pale);
  border-color: var(--sky-pale);
  color: var(--navy);
}

.join-apply-btn {
  margin-top: var(--space-xl);
}

/* Resources */

.book-grid {
  list-style: none;
  padding: 0;
  margin-top: var(--space-xl);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 150px));
  gap: var(--space-lg);
  justify-content: start;
}

.book-grid > li {
  min-width: 0;
}

.book-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-sm);
  text-align: center;
  text-decoration: none;
  color: var(--navy);
}

.book-card:hover {
  text-decoration: none;
  color: var(--sky);
}

.book-cover {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 2px;
  transition: transform 0.18s ease;
  background: var(--bg-alt);
}

.book-card:hover .book-cover {
  transform: translateY(-4px);
}

.book-title {
  font-size: 0.8125rem;
  line-height: 1.3;
  font-weight: 600;
}

.resources-prose h2 + h2 {
  margin-top: var(--space-2xl);
}

.resource-link-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-lg);
}

.resource-link-list li {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border);
}

.resource-link-list li:first-child {
  border-top: none;
}

.resource-link-list a {
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
}

.resource-link-list a:hover {
  color: var(--sky);
  text-decoration: none;
}

.reading-week {
  display: inline-block;
  min-width: 5rem;
  font-weight: 600;
  color: var(--sky);
  margin-right: var(--space-sm);
}

.resources-section-intro {
  color: var(--text-muted);
  max-width: 40rem;
  margin-top: var(--space-sm);
}

.resource-link-note {
  color: var(--text-muted);
}