.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%;
}

/* --- 強制讓文案區塊保持 1:1 正方形 --- */

.square-text-box {
  aspect-ratio: 1 / 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (min-width: 576px) {
  .square-text-box {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

.feature-title {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.feature-desc {
  font-size: 1rem;
  line-height: 2.2;
  color: var(--text-color);
  font-weight: 300;
  text-align: justify;
}

.feature-subtitle {
  font-size: 1rem;
  color: #b2b8c3;
  margin-bottom: 1.5rem;
  display: block;
  letter-spacing: 1px;
  opacity: 0.9;
  font-family: 'Lato', sans-serif;
}