/* 首页 Bootstrap 壳 + 计算器 iframe */
body.site-bs-home {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bs-body-bg, #0b1220);
}
body.site-bs-home > main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1rem 2rem;
}
.calc-frame-bs {
  width: min(720px, 100%);
  height: min(88vh, 920px);
  border: 1px solid var(--bs-border-color, #1f2937);
  border-radius: 12px;
  background: var(--bs-secondary-bg, #111827);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
}