.artifact-shell {
  width: min(100% - 3rem, 58rem);
  margin-inline: auto;
  padding-block: clamp(2rem, 7vw, 6rem);
}

.artifact-topnav,
.back-link { font-size: 0.8rem; }

h1 {
  max-width: 20ch;
  margin: 0;
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--ink);
  font: 700 clamp(1.75rem, 5.5vw, 4.4rem)/1.05 var(--font-display);
  letter-spacing: -0.045em;
}

.pir-document {
  padding-block: clamp(2rem, 5vw, 4rem);
  font: 400 clamp(0.78rem, 1.3vw, 0.92rem)/1.65 var(--font-display);
}

.pir-document h2,
.pir-document h3,
.pir-document h4 {
  font-family: inherit;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.pir-document h2 { margin: 0 0 1.5rem; font-size: clamp(1.25rem, 3vw, 1.8rem); }

.pir-document h3 {
  margin: 2.75rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: clamp(1rem, 2vw, 1.25rem);
}

.pir-document h4 { margin: 2rem 0 0.75rem; font-size: 0.95rem; }
.pir-document p,
.pir-document ul { max-width: 76ch; }
.pir-document ul { margin: 0; padding-left: 1.4rem; }
.pir-metadata,
.pir-checklist { list-style: none; padding-left: 0 !important; }
.pir-metadata li::before { content: "- "; color: var(--muted); }
.pir-checklist li + li { margin-top: 0.35rem; }

.pir-checklist input {
  width: 0.9rem;
  height: 0.9rem;
  margin: 0 0.4rem 0 0;
  accent-color: var(--accent);
}

.pir-table-scroll { max-width: 100%; overflow-x: auto; border: 1px solid var(--ink); }

.pir-document table {
  width: 100%;
  min-width: 42rem;
  border-collapse: collapse;
  background: var(--surface);
}

.pir-document th,
.pir-document td {
  min-width: 7rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.pir-document th { color: var(--surface); background: var(--ink); font-weight: 500; }

.source-link,
.related-link {
  padding: 1.2rem 0;
  font-size: clamp(0.78rem, 2.4vw, 0.95rem);
}

@media (max-width: 620px) {
  .artifact-shell { width: min(100% - 2rem, 58rem); }
}