/* iframe 壳页：顶栏固定，下方主区铺满视口 */
html.app-shell,
html.app-shell body {
  height: 100%;
  margin: 0;
}

body.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-height: 100vh;
  overflow: hidden;
  background: #f4f6f9;
}

.app-shell__frame-wrap {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 0;
}

#appFrame {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
  border: 0;
  display: block;
  background: #fff;
}