/* ============ Challenges: comparison board ============ */
.ss-challenges--pairs-v1 {
  background: #fafbfe;
  padding: 90px 0;
  border-top: 1px solid rgba(0,0,0,0.03);
  border-bottom: 1px solid rgba(0,0,0,0.03);
}

.challenge-board {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 1140px;
  margin: 0 auto;
}

.cb-column-headers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 8px;
  padding: 0 16px;
}

.cb-column-header {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cb-column-header:first-child {
  color: #dc2626;
}

.cb-column-header:last-child {
  color: #4f46e5;
}

.cb-row-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.cb-card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 20px;
  padding: 36px;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.28s;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.02);
  display: flex;
  flex-direction: column;
  align-items: start;
}

.cb-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: 20px 20px 0 0;
}

.cb-card--challenge::before {
  background: #ef4444;
}

.cb-card--solution::before {
  background: linear-gradient(90deg, #6c63ff, #4f46e5);
}

.cb-card--challenge {
  border-left: 3px solid rgba(239, 68, 68, 0.15);
}

.cb-card--solution {
  border-left: 3px solid rgba(108, 99, 255, 0.25);
  background: #fbfbfe;
}

.cb-card:hover {
  transform: translateY(-3px);
}

.cb-card--challenge:hover {
  box-shadow: 0 20px 38px -12px rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.22);
}

.cb-card--solution:hover {
  box-shadow: 0 20px 38px -12px rgba(108, 99, 255, 0.14);
  border-color: rgba(108, 99, 255, 0.35);
}

.cb-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.cb-tag--challenge {
  background: #fff1f1;
  color: #b91c1c;
}

.cb-tag--solution {
  background: #eef2ff;
  color: #4338ca;
}

.cb-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: #111315;
  margin: 0 0 10px 0;
  line-height: 1.35;
}

.cb-card p {
  font-size: 15px;
  color: #4e5058;
  margin: 0;
  line-height: 1.6;
}

@media(max-width:760px){
  .cb-column-headers {
    display: none;
  }
  .cb-row-pair {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .cb-card {
    padding: 28px;
  }
}