@charset "utf-8";
/* 裏のみCSS */

:root {
   /* https://min-max-calculator.9elements.com/ 幅:480-960px */
  --min0max20: clamp(0rem, -1.25rem + 4.17vw, 1.25rem);
  --min16max20: clamp(1rem, 0.75rem + 0.83vw, 1.25rem);
  --min60max70: clamp(3.75rem, 3.125rem + 2.08vw, 4.375rem);
}

.item-summary header .thumbnail {
  position: relative;
}
.item-summary header .thumbnail::before,
.item-summary header .thumbnail::after {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  margin: auto;
}
.item-summary header .thumbnail::before {
  content: "";
  background: rgb(0,0,0,.4);
  width: calc(100% - var(--min0max20));
  height: var(--min60max70);
}
.item-summary header .thumbnail::after {
  content: "";
  white-space: pre;
  color: #fff;
  height: fit-content;
  width: max-content;
  left: 0;
  right: 0;
  margin-inline: auto;
  font-weight: bold;
  font-size: var(--min16max20);
  line-height: 1.25;
  text-align: center;
}