:root {
  --sc_eff: 1;
}

/* 容器：a 标签，宽 90% 居中，高度随比例自动计算 */
.proad-frame {
  position: relative;
  display: block;
  width: 100%;
  margin: 0 auto;
  height: calc(var(--H, 0px) * var(--sc_eff));
  overflow: hidden;
  text-decoration: none;
}

.proad-play-frame {
  position: absolute;
  display: block;
  top: 50%;
  left: 50%;
  width: 80%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  text-decoration: none;
  border-radius: 4px;
}

/* 碎片：样式全部走样式表，不写内联 */
.ksyes {
  position: absolute;
  display: block;
  background-repeat: no-repeat;
}

/* 错误提示（可选） */
.err {
  width: 90%;
  margin: 12px auto;
  color: #b91c1c;
  font: 14px/1.6 system-ui, Arial, Helvetica, sans-serif;
}