.participation-options {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 2rem;
  margin-top: 1.5rem;
}

.participation-card {
  display: flex;
  flex: 1 1 0;
  flex-direction: column;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--primary-dark);
  border-radius: 10px;
}

.participation-card-title {
  margin: 0 0 1rem;
  color: var(--primary);
  font-size: 1.35rem;
  line-height: 1.25;
}

.participation-card .participation-list {
  flex-grow: 1;
}

.participation-card .participation-list li {
  display: block;
}

.sponsor-container {
  display: flex;
  width: 100%;
}

.sponsor-card {
  width: 100%;
}

.participation-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.25rem;
}

.participation-price {
  flex-shrink: 0;
  color: var(--primary);
  font-size: 1.35rem;
}

.proceedings-springer-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  margin-top: 1rem;
}

/* -------- Responsive -------- */

@media (max-width: 768px) {
  .participation-options {
    flex-direction: column;
  }

  .participation-card-footer {
    flex-wrap: wrap;
  }

  .participation-card-footer .custom-btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .participation-card {
    padding: 1rem;
  }

  .participation-card-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
}