.drl-flow {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin: 1.6rem 0;
}
.drl-flow > span {
  flex: 1;
  padding: 1rem .65rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--panel);
  text-align: center;
}
.drl-flow small {
  display: block;
  margin-top: .35rem;
  color: var(--muted);
  font-size: .78em;
}
.drl-flow > b { color: var(--muted); }
.drl-sequence > span { animation: drl-read-step 1.1s ease-out 1; }
.drl-sequence > span:nth-of-type(2) { animation-delay: 1.1s; }
.drl-sequence > span:nth-of-type(3) { animation-delay: 2.2s; }
.drl-sequence > span:nth-of-type(4) { animation-delay: 3.3s; }
@keyframes drl-read-step {
  0%, 100% { border-color: var(--rule); }
  25%, 70% { border-color: var(--ember); box-shadow: inset 0 -3px 0 var(--ember); }
}
@media (prefers-reduced-motion: reduce) {
  .drl-sequence > span { animation: none; }
}
@media print {
  .drl-sequence > span { animation: none; box-shadow: none; }
}
.drl-lab { margin: 2rem 0; }
.drl-experiment {
  padding: clamp(1rem, 3vw, 1.7rem);
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
}
.drl-experiment .drl-kicker {
  margin: 0 0 .65rem;
  color: var(--muted);
  font: .69rem/1.6 var(--mono);
  letter-spacing: .07em;
}
.drl-experiment h3 { margin: 0 0 1.25rem; font-size: 1.1rem; }
.drl-controls { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.drl-controls label {
  display: flex;
  gap: .65rem;
  align-items: center;
  flex: 1 1 240px;
  min-width: 0;
  font-size: .85rem;
}
.drl-controls input[type="range"] { flex: 1; min-width: 60px; accent-color: var(--ember); }
.drl-controls output { min-width: 3ch; font: .85rem var(--mono); }
.drl-controls button, .drl-controls select {
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: .55rem .8rem;
  min-height: 44px;
  font: inherit;
  font-size: .82rem;
  cursor: pointer;
}
.drl-controls :focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; }
.drl-result { margin: 1.5rem 0 1rem; display: grid; gap: .9rem; }
.drl-bar-row {
  display: grid;
  grid-template-columns: minmax(105px, 1fr) minmax(60px, 2fr) 7ch;
  align-items: center;
  gap: .7rem;
  font: .78rem/1.5 var(--mono);
}
.drl-bar-row strong { text-align: right; font-weight: 500; }
.drl-track { height: 14px; border: 1px solid var(--rule); border-radius: 3px; overflow: hidden; }
.drl-track > span { display: block; height: 100%; background: var(--ember); }
.drl-track > .drl-negative {
  background: repeating-linear-gradient(135deg, var(--muted), var(--muted) 2px, transparent 2px, transparent 5px);
}
.drl-experiment .drl-explanation { margin: 1rem 0 0; color: var(--muted); font-size: .84rem; line-height: 1.8; }
.drl-controls button:disabled { opacity: .45; cursor: default; }
.drl-plot { width: 100%; height: auto; display: block; overflow: visible; }
.drl-plot text { fill: var(--muted); font: 15px var(--mono); }
.drl-grid { stroke: var(--rule); stroke-width: 1; }
.drl-line { fill: none; stroke-width: 3; stroke-linejoin: round; }
.drl-line.drl-series-0 { stroke: var(--ember); }
.drl-line.drl-series-1 { stroke: var(--ink); stroke-dasharray: 8 5; }
.drl-line.drl-series-2 { stroke: var(--muted); stroke-dasharray: 2 5; }
.drl-point.drl-series-0 { fill: var(--ember); }
.drl-point.drl-series-1 { fill: var(--ink); }
.drl-point.drl-series-2 { fill: var(--muted); }
.drl-legend { display: flex; flex-wrap: wrap; gap: .7rem 1rem; font-size: .78rem; }
.drl-legend span { padding-bottom: .2rem; border-bottom: 2px solid var(--ember); }
.drl-legend .drl-series-1 { border-color: var(--ink); border-bottom-style: dashed; }
.drl-legend .drl-series-2 { border-color: var(--muted); border-bottom-style: dotted; }
.drl-data { margin: .7rem 0 0; border-top: 1px solid var(--rule); padding-top: .7rem; }
.drl-data summary { cursor: pointer; font-size: .83rem; color: var(--ink); padding: .5rem 0; }
.drl-data summary:focus-visible, .drl-table-scroll:focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; }
.drl-table-scroll { max-width: 100%; overflow-x: auto; }
.drl-data table { width: 100%; font-size: .78rem; margin: .6rem 0; }
.drl-data caption { text-align: left; color: var(--muted); padding: .5rem 0; font-size: .75rem; }
.drl-data th, .drl-data td { white-space: nowrap; padding: .55rem .65rem; }
.drl-paths { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.drl-path { background: var(--panel); border: 1px solid var(--rule); border-radius: 8px; padding: 1rem; }
.drl-path h3 { margin: 0 0 .8rem; font-size: .95rem; }
.drl-path ol { margin: 0; padding-left: 1.3rem; font-size: .85rem; }
.drl-path li { padding: .25rem 0; }
.drl-path small { display: block; margin-top: .75rem; color: var(--muted); line-height: 1.7; }
@media (max-width: 540px) {
  .drl-paths { grid-template-columns: 1fr; }
  .drl-flow { flex-direction: column; align-items: stretch; }
  .drl-flow > b { text-align: center; transform: rotate(90deg); }
  .drl-bar-row { grid-template-columns: minmax(82px, 1.2fr) minmax(35px, 1fr) 6ch; gap: .45rem; font-size: .7rem; }
  .drl-controls label { flex-basis: 100%; flex-wrap: wrap; }
  .drl-controls select { max-width: 100%; }
}