/* ============================================================
   SLIDE 10 — DIAGRAM PLACEHOLDER
   ============================================================ */
.s-diagram .body {
  position: absolute;
  inset: 56px 0 56px 0;
  padding: 100px var(--pad-x) 80px var(--pad-x);
  display: flex;
  flex-direction: column;
}
.diagram-frame {
  margin-top: 56px;
  flex: 1;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  position: relative;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 40px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.diagram-frame .ph-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--type-mono-lg);
  color: var(--fg-mute);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.diagram-frame .ph-spec {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--type-mono);
  color: var(--fg-mute);
  border: 1px solid var(--line-strong);
  padding: 10px 22px;
  border-radius: 4px;
}
.diagram-frame .corner {
  position: absolute;
  width: 20px; height: 20px;
  border-color: var(--accent);
}
.diagram-frame .corner.tl { top: -1px; left: -1px; border-top: 2px solid; border-left: 2px solid; }
.diagram-frame .corner.tr { top: -1px; right: -1px; border-top: 2px solid; border-right: 2px solid; }
.diagram-frame .corner.bl { bottom: -1px; left: -1px; border-bottom: 2px solid; border-left: 2px solid; }
.diagram-frame .corner.br { bottom: -1px; right: -1px; border-bottom: 2px solid; border-right: 2px solid; }