.challenges-hero {
  padding: 3.5rem 0 3rem;
}

.challenges-title {
  color: var(--aniot-text);
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.14;
  margin-bottom: 1rem;
  text-wrap: balance;
}

.challenges-description {
  color: var(--aniot-text-soft);
  font-size: 1.06rem;
  margin-bottom: 0;
  max-width: 56rem;
}

.process-section {
  background: var(--aniot-surface);
  border-bottom: 1px solid var(--aniot-border);
}

.research-process {
  counter-reset: process-step;
  display: grid;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 1rem;
}

.research-process li {
  align-items: flex-start;
  border: 1px solid var(--aniot-border);
  border-radius: 8px;
  display: flex;
  gap: 0.75rem;
  padding: 0.9rem;
  position: relative;
}

.research-process li:not(:last-child)::after {
  align-items: center;
  background: var(--aniot-bg);
  border: 1px solid var(--aniot-border);
  border-radius: 999px;
  bottom: -1.18rem;
  color: var(--aniot-secondary);
  content: "↓";
  display: inline-flex;
  font-weight: 750;
  height: 1.55rem;
  justify-content: center;
  left: 50%;
  position: absolute;
  transform: translateX(-50%);
  width: 1.55rem;
  z-index: 1;
}

.process-step-number {
  align-items: center;
  background: var(--aniot-secondary);
  border-radius: 999px;
  color: #ffffff;
  display: inline-flex;
  flex: 0 0 1.85rem;
  font-size: 0.85rem;
  font-weight: 700;
  height: 1.85rem;
  justify-content: center;
  width: 1.85rem;
}

.process-step-icon {
  align-items: center;
  background: var(--aniot-soft);
  border: 1px solid var(--aniot-subtle-border);
  border-radius: 999px;
  color: var(--aniot-primary-dark);
  display: inline-flex;
  flex: 0 0 2rem;
  height: 2rem;
  justify-content: center;
  width: 2rem;
}

.process-step-icon svg,
.challenge-marker-icon svg {
  fill: none;
  height: 1.08rem;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  width: 1.08rem;
}

.research-process strong {
  display: block;
  margin-bottom: 0.2rem;
}

.research-process span:last-child {
  color: var(--aniot-muted);
  display: block;
}

.challenges-browser {
  padding-top: 2.5rem;
}

.filter-panel {
  padding: 1rem;
}

.filter-panel .form-label {
  color: var(--aniot-text);
  font-weight: 650;
}

.filter-panel .form-control,
.filter-panel .form-select {
  border-color: var(--aniot-border);
}

.filter-panel .form-control:focus,
.filter-panel .form-select:focus {
  border-color: var(--aniot-accent);
  box-shadow: 0 0 0 0.2rem var(--aniot-focus-ring-soft);
}

.results-toolbar {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.results-title {
  font-size: 1.55rem;
  font-weight: 700;
  margin-bottom: 0;
}

.result-count {
  background: var(--aniot-surface);
  border: 1px solid var(--aniot-border);
  border-radius: 999px;
  color: var(--aniot-secondary);
  font-weight: 700;
  margin-bottom: 0;
  padding: 0.35rem 0.75rem;
}

.active-filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  min-height: 1.8rem;
}

.filter-chip {
  background: var(--aniot-surface);
  border: 1px solid var(--aniot-border);
  border-radius: 999px;
  color: var(--aniot-text);
  font-size: 0.88rem;
  padding: 0.28rem 0.65rem;
}

.filter-chip.query-chip {
  background: var(--aniot-soft);
  border-color: var(--aniot-subtle-border);
  color: var(--aniot-primary-dark);
  font-weight: 650;
}

.challenge-results {
  display: grid;
  gap: 1rem;
}

.challenge-card {
  padding: 1rem;
}

.challenge-card-header {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.challenge-card h3 {
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.32;
  margin-bottom: 0.5rem;
  text-wrap: balance;
}

.challenge-card h3 a {
  color: var(--aniot-text);
  text-decoration: none;
}

.challenge-card h3 a:hover,
.challenge-card h3 a:focus {
  color: var(--aniot-primary-dark);
  text-decoration: underline;
}

.challenge-summary {
  color: var(--aniot-muted);
  margin-bottom: 0;
}

.challenge-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.challenge-markers {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: -0.2rem 0 1rem;
}

.challenge-marker {
  align-items: center;
  background: var(--aniot-sage-50);
  border: 1px solid var(--aniot-border);
  border-radius: 999px;
  color: var(--aniot-text-soft);
  display: inline-flex;
  font-size: 0.86rem;
  font-weight: 650;
  gap: 0.35rem;
  line-height: 1.2;
  padding: 0.28rem 0.58rem 0.28rem 0.32rem;
}

.challenge-marker-icon {
  align-items: center;
  background: var(--aniot-surface);
  border: 1px solid var(--aniot-subtle-border);
  border-radius: 999px;
  color: var(--aniot-secondary);
  display: inline-flex;
  flex: 0 0 auto;
  height: 1.45rem;
  justify-content: center;
  width: 1.45rem;
}

.challenge-marker-status-open {
  color: var(--aniot-primary-dark);
}

.challenge-marker-status-review {
  color: #8a4b12;
}

.challenge-marker-status-complete {
  color: var(--aniot-secondary);
}

.challenge-meta-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
  margin-bottom: 1rem;
}

.challenge-meta-item {
  border-top: 1px solid var(--aniot-border);
  padding-top: 0.75rem;
}

.challenge-meta-label {
  color: var(--aniot-muted);
  display: block;
  font-size: 0.84rem;
  margin-bottom: 0.1rem;
}

.challenge-meta-value {
  color: var(--aniot-text);
  font-weight: 650;
}

.challenge-meta-value a {
  font-weight: 700;
  text-decoration: none;
}

.challenge-meta-value a:hover,
.challenge-meta-value a:focus {
  text-decoration: underline;
}

.challenge-card-footer {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
}

.challenge-id {
  color: var(--aniot-muted);
  font-size: 0.84rem;
  margin-bottom: 0;
  overflow-wrap: anywhere;
}

.empty-state {
  padding: 1.5rem;
  text-align: center;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--aniot-muted);
  margin: 0 auto 1rem;
  max-width: 36rem;
}

@media (min-width: 576px) {
  .challenge-meta-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .challenges-hero {
    padding: 4.5rem 0 3.5rem;
  }

  .challenges-title {
    font-size: 2.65rem;
  }

  .results-toolbar {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }

  .challenge-card {
    padding: 1.25rem;
  }

  .challenge-card-header {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 992px) {
  .filter-panel {
    position: sticky;
    top: 5rem;
  }

  .challenge-meta-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .research-process {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .research-process li {
    align-content: start;
    display: grid;
    grid-template-columns: auto auto 1fr;
  }

  .research-process li > div {
    grid-column: 1 / -1;
  }

  .research-process li:not(:last-child)::after,
  .research-process li:nth-child(2)::after,
  .research-process li:nth-child(3)::after,
  .research-process li:nth-child(4)::after {
    bottom: auto;
    content: "→";
    left: auto;
    right: -1.18rem;
    top: 1.75rem;
    transform: none;
  }
}