.challenge-card {
  background: linear-gradient(90deg, #fef9c3 0%, #f0fdfa 100%);
  border-radius: 1.5rem;
  box-shadow: 0 2px 16px rgba(60, 60, 120, 0.08);
  padding: 1.5rem;
  margin: 1.5rem auto;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: box-shadow 0.3s;
}
.challenge-card:hover {
  box-shadow: 0 4px 24px rgba(60, 60, 120, 0.16);
}
.challenge-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.challenge-badge {
  font-size: 2rem;
  background: linear-gradient(90deg, #fbbf24 0%, #fde68a 100%);
  border-radius: 50%;
  padding: 0.5rem 1rem;
  color: #b45309;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(251, 191, 36, 0.12);
}
.challenge-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #374151;
}
.challenge-desc {
  font-size: 1rem;
  color: #6366f1;
  margin-bottom: 1rem;
}
.challenge-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.challenge-points {
  font-size: 1rem;
  font-weight: 600;
  color: #06b6d4;
}
.challenge-btn {
  background: linear-gradient(90deg, #6366f1 0%, #06b6d4 100%);
  color: #fff;
  border: none;
  border-radius: 1rem;
  padding: 0.5rem 1.2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s;
}
.challenge-btn:hover {
  background: linear-gradient(90deg, #06b6d4 0%, #6366f1 100%);
}
@media (max-width: 600px) {
  .challenge-card {
    max-width: 98vw;
    padding: 1rem;
  }
  .challenge-title {
    font-size: 1.1rem;
  }
  .challenge-desc {
    font-size: 0.95rem;
  }
}