.bs-icon {
  --bs-icon-size: .75rem;
  display: flex;
  flex-shrink: 0;
  justify-content: center;
  align-items: center;
  font-size: var(--bs-icon-size);
  width: calc(var(--bs-icon-size) * 2);
  height: calc(var(--bs-icon-size) * 2);
  color: var(--bs-primary);
}

.bs-icon-xs {
  --bs-icon-size: 1rem;
  width: calc(var(--bs-icon-size) * 1.5);
  height: calc(var(--bs-icon-size) * 1.5);
}

.bs-icon-sm {
  --bs-icon-size: 1rem;
}

.bs-icon-md {
  --bs-icon-size: 1.5rem;
}

.bs-icon-lg {
  --bs-icon-size: 2rem;
}

.bs-icon-xl {
  --bs-icon-size: 2.5rem;
}

.bs-icon.bs-icon-primary {
  color: var(--bs-white);
  background: var(--bs-primary);
}

.bs-icon.bs-icon-primary-light {
  color: var(--bs-primary);
  background: rgba(var(--bs-primary-rgb), .2);
}

.bs-icon.bs-icon-semi-white {
  color: var(--bs-primary);
  background: rgba(255, 255, 255, .5);
}

.bs-icon.bs-icon-rounded {
  border-radius: .5rem;
}

.bs-icon.bs-icon-circle {
  border-radius: 50%;
}

.carousel-item {
  background-size: contain;
}

.carousel-item > img {
  /*border-radius: 25px;*/
}

.nav-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.nav-buttons button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  font-size: 22px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.btn-prev {
  background: #ddd;
  color: white;
}

.btn-next {
  background: #FF6A00;
  color: white;
}

.step-card {
  width: 420px;
  border: 1px solid #ddd;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  padding: 20px;
  display: flex;
  flex-direction: column;
  background: white;
}

.step-card h4 {
  font-size: 16px;
  margin: 0 0 12px 0;
}

.step-card .highlight {
  color: #FF6A00;
  font-weight: bold;
}

.step-card p {
  font-size: 14px;
  color: #333;
}

.step-img {
  width: 100%;
  height: 200px;
  background-image: url('https://via.placeholder.com/420x200?text=橘色拼圖+黑白圖');
  background-size: cover;
  background-position: center;
  border-radius: 8px;
  margin-bottom: 15px;
}

.bottom-btn {
  margin-top: 30px;
  text-align: center;
}

.bottom-btn button {
  padding: 6px 16px;
  border: 1px solid #888;
  border-radius: 20px;
  background: white;
  font-size: 14px;
  cursor: pointer;
}

/* RWD */

@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .left-panel {
    text-align: center;
  }
}