/* R25: one DMA write, moved by scrolling. */
.dma-scroll { margin: 32px 0; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 32px; align-items: start; }
.ds-sticky {
  position: sticky;
  top: calc(var(--reading-top, 0px) + var(--reading-bar, 0px) + 20px);
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.ds-sticky .eyebrow { margin: 0 0 8px; color: var(--accent); }
.ds-track { display: block; width: 100%; height: auto; overflow: visible; }
.ds-rail { stroke: var(--line); stroke-width: 2; stroke-dasharray: 2 6; stroke-linecap: round; }
.ds-trail { stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round; }
.ds-node rect { fill: var(--bg); stroke: var(--line); stroke-width: 1.5; transition: stroke 0.25s ease; }
.ds-node text { fill: var(--muted); font: 600 10px ui-monospace, "SF Mono", Menlo, Consolas, monospace; letter-spacing: 0.14em; text-anchor: middle; }
.ds-node .ds-sub { fill: var(--ink); font-size: 10px; letter-spacing: 0.04em; font-weight: 500; }
.ds-node[data-reached] rect { stroke: var(--accent); }
.ds-node[data-reached] > text:not(.ds-sub) { fill: var(--ink); }
.ds-core { fill: var(--accent); }
.ds-halo { fill: var(--accent); opacity: 0.2; }
.ds-fault rect { fill: var(--accent); }
.ds-fault text { fill: var(--button-ink); font: 800 12px ui-monospace, "SF Mono", Menlo, Consolas, monospace; letter-spacing: 0.2em; text-anchor: middle; }
[data-blocked] .ds-iommu rect { stroke: var(--accent); stroke-width: 3; }
[data-blocked] .ds-core { fill: var(--muted); }
.ds-label { margin: 10px 0 0; min-height: 2.8em; font: 12px/1.4 ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: var(--ink); overflow-wrap: anywhere; }
[data-blocked] .ds-label { color: var(--accent); }
.ds-toggle { margin-top: 10px; min-height: 40px; padding: 8px 16px; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--ink); font-size: 0.875rem; font-weight: 600; }
.ds-toggle[aria-pressed="true"] { border-color: var(--accent); background: var(--soft); }
.ds-toggle[hidden] { display: none; }
.ds-steps { margin: 0; padding: 0 0 0 1.4em; }
.ds-step { margin: 0 0 24px; color: var(--muted); line-height: 1.65; }
.ds-step strong { display: block; color: var(--ink); margin-bottom: 4px; }
.ds-live .ds-step { margin-bottom: 0; padding-block: 12vh; opacity: 0.45; transition: opacity 0.3s ease; }
.ds-live .ds-step:first-child { padding-top: 4px; }
.ds-live .ds-step:last-child { padding-bottom: 20vh; }
.ds-live .ds-step[data-active] { opacity: 1; }
.ds-live .ds-step::marker { color: var(--accent); }
@media (max-width: 820px) {
  .dma-scroll { grid-template-columns: 1fr; gap: 12px; }
  .ds-sticky { z-index: 2; padding: 12px 14px; box-shadow: 0 12px 30px var(--shadow); }
  .ds-live .ds-step { padding-block: 16vh; }
  .ds-label { min-height: 0; }
}
@media (max-width: 820px) {
  .ds-sticky { top: 8px; }
  .ds-node .ds-sub { display: none; }
  .ds-node text { font-size: 17px; letter-spacing: 0.06em; }
  .ds-node text { transform: translateY(8px); }
  .ds-fault text { font-size: 15px; }
  .ds-track { margin-block: 4px 8px; }
}