.challenge-shell {
  padding: 28px 0;
}

.challenge-card {
  border: 0;
  border-radius: 24px;
  background: linear-gradient(155deg, #151515 0%, #0d0d0d 100%);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.56), 0 0 42px rgba(119, 74, 255, 0.07);
}

.challenge-card form button {
  border-radius: 10px;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.challenge-card form button:hover {
  background: #f0f0ec;
  transform: translateY(-1px);
}

.challenge-card form button:focus {
  outline: none;
}

.challenge-card form button:focus-visible,
.challenge-brand:focus-visible {
  outline: 2px solid #9a65ff;
  outline-offset: 4px;
}

@media (max-width: 600px) {
  .challenge-card {
    border-radius: 18px;
  }
}