.data-index-shell {
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem;
}

.data-project {
  overflow: clip;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--paper);
}

.data-project > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.55rem;
  align-items: center;
  min-height: 48px;
  padding: 0.55rem 0.65rem;
  background: var(--paper-2);
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.data-project > summary::-webkit-details-marker { display: none; }

.data-project > summary::before {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 1.2rem;
  height: 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-2);
  font: 700 0.75rem/1 var(--font-mono);
}

.data-project[open] > summary::before { content: "−"; }
.data-project > summary:hover { background: var(--row-hover); }
.data-project > summary:focus-visible { outline: 2px solid var(--accent-2); outline-offset: -2px; }

.data-project-title {
  display: grid;
  gap: 0.08rem;
  min-width: 0;
}

.data-project-title strong { font: 700 1rem/1.1 var(--font-serif); }
.data-project-title small { color: var(--ink-3); font-size: 0.7rem; font-weight: 400; }

.data-project-status {
  padding: 0.16rem 0.38rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-2);
  font: 700 0.58rem/1.2 var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.data-project-body {
  min-width: 0;
  border-top: 1px solid var(--rule);
}

.data-source-note {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  padding: 0.5rem 0.65rem;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.data-source-note .hbtn {
  margin-left: auto;
}

.data-display-frame {
  display: block;
  width: 100%;
  height: max(680px, calc(100vh - 245px));
  border: 0;
  background: var(--plain);
}

@media (max-width: 620px) {
  .data-index-shell {
    padding-left: 0.6rem;
    padding-right: 0.6rem;
  }

  .data-project > summary { grid-template-columns: auto minmax(0, 1fr); }
  .data-project-status { grid-column: 2; justify-self: start; }
  .data-source-note .hbtn { margin-left: 0; }
  .data-display-frame { height: max(620px, calc(100vh - 275px)); }
}