@media screen and (min-width: 960px) {
  /* PC */
  /* ----------  ---------- */  
  a.portfolio-list-item {
    width: 100%;

    background-color: #ffffff;
    overflow: hidden;

    text-decoration: none;
  }

  .portfolio-list-item__thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    position: relative;

    border: 1px solid var(--secondary-base-color-code);
  }

  .portfolio-list-item__thumbnail img {
    transition-property: all;
    transition-duration: 0.33s;
    transition-timing-function: ease;
  }

  .portfolio-list-item__thumbnail p {
    color: #ffffff;
    position: absolute;
    font-family: var(--noto-serif-jp);

    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);

    transition-property: all;
    transition-duration: 0.33s;
    transition-timing-function: ease;
  }
  
  .portfolio-list-item__thumbnail p {
    opacity: 0;
  }

  a.portfolio-list-item:hover .portfolio-list-item__thumbnail img {
    filter: brightness(0.575);
  }

  a.portfolio-list-item:hover .portfolio-list-item__thumbnail p {
    opacity: 1;
  }

  .portfolio-list-item__information {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .portfolio-list-item__title p {
    color: #000000;
  }

  .portfolio-list-item__label span {
    display: block;
    font-size: var(--font-size-small);
    color: rgb(var(--main-color-rgb) / 0.55);
    line-height: var(--font-size-small);
  }

}

@media screen and (max-width: 959px) {
  /* Tablet and Mobile */
  /* ----------  ---------- */
  a.portfolio-list-item {
    width: 100%;

    background-color: #ffffff;
    overflow: hidden;

    text-decoration: none;
  }

  .portfolio-list-item__thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    position: relative;

    border: 1px solid var(--secondary-base-color-code);
  }

  .portfolio-list-item__thumbnail img {
    transition-property: all;
    transition-duration: 0.33s;
    transition-timing-function: ease;
  }

  .portfolio-list-item__thumbnail p {
    color: #ffffff;
    position: absolute;
    font-family: var(--noto-serif-jp);

    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);

    transition-property: all;
    transition-duration: 0.33s;
    transition-timing-function: ease;
  }
  
  .portfolio-list-item__thumbnail p {
    opacity: 0;
  }

  a.portfolio-list-item:hover .portfolio-list-item__thumbnail img {
    filter: brightness(0.575);
  }

  a.portfolio-list-item:hover .portfolio-list-item__thumbnail p {
    opacity: 1;
  }

  .portfolio-list-item__information {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  .portfolio-list-item__title p {
    color: #000000;
  }

  .portfolio-list-item__label span {
    display: block;
    font-size: var(--font-size-small);
    color: rgb(var(--main-color-rgb) / 0.55);
    line-height: var(--font-size-small);
  }
}