<!-- Warning !!!

Just an experiment.

Probably not accessible

-->

<details>
  <summary>Show Retired things</summary>
  <details class="tier1">
    <summary><span>Show</span> <b>Hide</b> Tier 1 Retired things</summary>
    <div class="modal">
      <div class="modal-content">Modal 1</div>
    </div>
  </details>

  <details class="tier2">
    <summary><span>Show</span> <b>Hide</b> Tier 2 Retired things</summary>
    <div class="modal">
      <div class="modal-content">Modal 2</div>
    </div>
  </details>

  <details class="tier3">
    <summary><span>Show</span> <b>Hide</b> Tier 3 Retired things</summary>
    <div class="modal">
      <div class="modal-content">Modal 3</div>
    </div>
  </details>

</details>

summary {
  padding: 0.5rem 1rem;
  border: 1px solid #000;
  border-radius: 10px;
  width: fit-content;
  background: linear-gradient(cyan, teal);
  color: #fff;
  cursor: pointer;
  margin: 0 0 0.5rem;
}
details details[open] .modal {
  position: fixed;
  display: flex;
  place-iems: cnter;
  z-index: 999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.9);
}
details details[open] > summary {
  position: fixed;
  top: 0.5rem;
  right: 0;
  left: 0;
  margin: auto;
  z-index: 1000;
}
.modal-content {
  padding: 1rem 1rem 1rem;
  max-width: 860px;
  min-height: 200px;
  width: 100%;
  margin: auto;
  background: #fff;
  border: 5px solid red;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
}

summary b {
  display: none;
}
details details[open] summary span {
  display: none;
}
details details[open] summary b {
  display: inline;
}