/* Guide-only, progressively enhanced semantic walkthroughs. */
.step-explainer { min-width: 0; align-self: start; border: 1px solid var(--line-strong); background: var(--mint); }
.explainer-heading { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding: 20px 24px; border-bottom: 1px solid var(--line-strong); }
.explainer-heading b { font-size: 17px; font-weight: 550; }
.explainer-heading > span { font-size: 12px; color: var(--muted); }
.step-controls { padding: 18px 24px; border-bottom: 1px solid var(--line-strong); background: var(--surface); }
.step-picks { display: flex; flex-wrap: wrap; gap: 6px; }
.step-picks button { display: flex; align-items: center; gap: 7px; text-align: left; border: 1px solid var(--line-strong); background: transparent; color: var(--ink); padding: 9px 11px; min-height: 44px; font-size: 12px; line-height: 1.35; }
.step-picks button > span { font-variant-numeric: tabular-nums; color: var(--muted); }
.step-picks button[aria-pressed="true"] { background: var(--green); color: #fff; border-color: var(--green); }
.step-picks button[aria-pressed="true"] > span { color: #fff; }
.step-picks button:hover:not([aria-pressed="true"]), .step-transport button:hover:enabled { background: var(--lime); color: var(--green); }
.step-transport { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; margin-top: 14px; }
.step-transport button { border: 0; border-bottom: 1px solid var(--line-strong); padding: 8px 3px; min-height: 44px; background: transparent; color: var(--green); font-size: 13px; }
.step-transport button:disabled { color: var(--muted); border-color: var(--line); }
.step-transport [data-play] { margin-left: 8px; min-width: 50px; }
[data-step-status] { margin-left: auto; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.motion-note { color: var(--muted); font-size: 12px; margin-top: 12px; }
.explainer-steps { list-style: none; margin: 0; padding: 0; }
[data-scene] { padding: 26px 24px; }
[data-scene] + [data-scene] { border-top: 1px solid var(--line-strong); }
[data-enhanced] [data-scene] { border-top: 0; }
.step-description { margin-bottom: 26px; }
.step-description h4 { font-size: 21px; font-weight: 550; letter-spacing: -.02em; margin-bottom: 9px; }
.step-description p { font-size: 14px; line-height: 1.65; color: var(--muted); max-width: 74ch; }
.flow-track { display: flex; gap: 22px; margin-bottom: 24px; }
.flow-node { flex: 1; min-width: 0; padding: 14px 12px; position: relative; border: 1px solid var(--line-strong); background: var(--surface); }
.flow-node + .flow-node::before { content: ""; position: absolute; left: -23px; top: 50%; width: 22px; height: 1px; background: var(--diagram-line); }
.flow-node + .flow-node::after { content: ""; position: absolute; left: -7px; top: calc(50% - 3px); width: 6px; height: 6px; border-top: 1px solid var(--diagram-line); border-right: 1px solid var(--diagram-line); transform: rotate(45deg); }
.flow-node b, .flow-node span { display: block; }
.flow-node b { font-size: 14px; font-weight: 550; }
.flow-node span { font-size: 12px; margin-top: 5px; color: var(--muted); }
.flow-node.is-current { background: var(--lime); border-color: var(--green); }
.inference-memory { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; margin-bottom: 22px; }
.weight-residency, .request-memory { border-block: 1px solid var(--line-strong); padding-block: 17px; }
.inference-memory span, .inference-memory b { font-size: 13px; font-weight: 500; }
.inference-memory small { display: block; color: var(--muted); font-size: 12px; margin-top: 8px; }
.weight-grid { display: grid; grid-template-columns: repeat(12,1fr); gap: 5px; margin-block: 14px; max-width: 320px; }
.weight-grid i { background: var(--green); height: 16px; }
.cache-slots { display: flex; flex-wrap: wrap; gap: 7px; margin-block: 14px; min-height: 42px; align-items: start; }
.cache-block { padding: 9px 13px; border: 1px solid var(--line-strong); background: var(--lime); color: var(--green); }
.cache-block.new-block { background: var(--green); color: #fff; border-color: var(--green); }
.empty-slot { padding: 9px 13px; border: 1px dashed var(--line-strong); color: var(--muted); }
.signal { border-top: 1px solid var(--line-strong); padding-top: 17px; min-height: 86px; }
.signal > span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 7px; }
.signal strong { display: block; color: var(--green); font-weight: 500; font-size: 21px; line-height: 1.35; overflow-wrap: anywhere; }
.signal code { font-size: 12px; }
.return-path { margin-top: 18px; border-block: 1px dashed var(--line-strong); padding-block: 12px; font-size: 12px; color: var(--muted); }
.safety-boundary { display: flex; flex-direction: column; gap: 7px; border: 1px dashed var(--muted); background: var(--mint); padding: 16px; margin-top: 18px; }
.safety-boundary b { font-size: 14px; font-weight: 550; }
.safety-boundary span, .safety-boundary small { font-size: 12px; color: var(--muted); }
.step-explainer figcaption { padding: 16px 24px; border-top: 1px solid var(--line-strong); color: var(--muted); font-size: 12px; }
.application-walkthrough .flow-track { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 22px; }
.application-walkthrough .flow-node:nth-child(3)::before, .application-walkthrough .flow-node:nth-child(3)::after { display: none; }
.memory-allocation { display: flex; flex-direction: column; margin-bottom: 24px; }
.memory-allocation span { padding: 18px 14px; background: var(--lime); border: 1px solid var(--line-strong); font-size: 13px; }
.memory-allocation span + span { border-top: 0; background: var(--mint); }
.distributed-chips { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.distributed-chips span { font-size: 11px; text-align: center; padding: 12px 7px; border: 1px solid var(--line-strong); background: var(--mint); }
.distributed-chips b { display: block; color: var(--green); font-weight: 550; margin-top: 3px; font-size: 15px; }
.host-memory { border: 1px dashed var(--line-strong); padding: 12px; text-align: center; font-size: 12px; margin-bottom: 18px; }
.memory-tiers { display: flex; flex-direction: column; align-items: center; gap: 13px; margin-bottom: 24px; }
.memory-tiers span { padding: 13px 6px; width: 76%; text-align: center; font-size: 12px; background: var(--surface); border: 1px solid var(--line-strong); position: relative; }
.memory-tiers span:nth-child(2) { width: 88%; }
.memory-tiers span:nth-child(3) { width: 100%; }
.memory-tiers span + span::before { content: ""; height: 13px; width: 1px; background: var(--diagram-line); position: absolute; top: -14px; left: 50%; }
.memory-tiers span.is-current { color: #fff; background: var(--green); border-color: var(--green); }
@keyframes expose-result { from { clip-path: inset(0 100% 0 0); } to { clip-path: inset(0); } }
@media (prefers-reduced-motion: no-preference) {
  .inference-explainer[data-enhanced] [data-scene]:not([hidden]) .signal strong { animation: expose-result 360ms var(--ease); }
}

@media (max-width: 600px) {
  .explainer-heading, .step-controls, [data-scene], .step-explainer figcaption { padding-inline: 16px; }
  .explainer-heading b { font-size: 16px; }
  .step-picks { display: grid; grid-template-columns: 1fr 1fr; }
  .step-picks button { padding: 8px; }
  .step-transport { gap: 6px 10px; }
  [data-step-status] { flex-basis: 100%; margin-left: 0; margin-top: 4px; }
  .step-description h4 { font-size: 20px; }
  .flow-track, .application-walkthrough .flow-track { display: flex; flex-direction: column; gap: 18px; }
  .flow-node { padding: 10px 14px; }
  .flow-node + .flow-node::before { width: 1px; height: 18px; top: -19px; left: 24px; }
  .flow-node + .flow-node::after { top: -7px; left: 21px; transform: rotate(135deg); }
  .flow-turn + .flow-node::before { content: ""; position: absolute; width: 1px; height: 18px; top: -19px; left: 24px; background: var(--diagram-line); }
  .flow-turn + .flow-node::after { content: ""; position: absolute; width: 6px; height: 6px; top: -7px; left: 21px; border-top: 1px solid var(--diagram-line); border-right: 1px solid var(--diagram-line); transform: rotate(135deg); }
  .inference-memory { grid-template-columns: 1fr; gap: 8px; }
  .inference-memory .request-memory { border-top: 0; }
  .application-walkthrough[data-enhanced] .step-description { min-height: 0; }
  .memory-explainer .step-picks button { font-size: 12px; padding: 8px; }
  .memory-explainer [data-step-status] { flex-basis: auto; margin-left: auto; }
  .memory-explainer .explainer-heading, .memory-explainer .step-controls, .memory-explainer [data-scene], .memory-explainer figcaption { padding-inline: 16px; }
}
.data-packet { margin-top: 14px; border-top: 1px solid var(--line-strong); padding-top: 10px; }
.data-packet > small { display: block; color: var(--green); font-size: 11px; margin-bottom: 7px; }
.data-packet > div { display: flex; flex-wrap: wrap; gap: 5px; }
.data-packet > div > span { background: var(--surface); color: var(--ink); border: 1px solid var(--line-strong); font-size: 11px; padding: 4px 7px; margin: 0; }
.decode-return { border-block: 1px dashed var(--line-strong); padding: 12px 0; margin-bottom: 18px; color: var(--green); font-size: 13px; }
.flow-turn { grid-column: 1 / -1; height: 24px; margin-block: -10px; }
.flow-turn svg { display: block; width: 100%; height: 24px; fill: none; stroke: var(--diagram-line); stroke-width: 1px; vector-effect: non-scaling-stroke; }
@media (max-width: 600px) {
  .flow-turn { display: none; }
  .inference-explainer .flow-node { display: grid; grid-template-columns: 1fr 1.3fr; align-items: center; gap: 12px; }
  .inference-explainer .flow-node span { margin-top: 0; }
  .inference-explainer .weight-residency { padding-block: 12px; }
  .inference-explainer .weight-grid { gap: 4px; margin-block: 10px; }
  .inference-explainer .weight-grid i { height: 10px; }
}

/* Diagram shapes share the homepage's quiet, rounded geometry. */
.step-explainer { border-radius: 16px; overflow: hidden; }
.step-picks button { border-radius: 8px; }
.flow-node, .distributed-chips span, .memory-tiers span, .data-packet > div > span { border-radius: 10px; }
.flow-node.is-current { background: var(--lime); border-color: var(--diagram-line); }
.cache-block, .empty-slot, .weight-grid i { border-radius: 4px; }
.step-description h4 { margin-top: 0; }
.safety-boundary { border-radius: 10px; }
.step-transport button { border: 1px solid var(--line-strong); border-radius: 8px; padding: 8px 12px; }
.step-transport button:disabled { opacity: .65; }
.memory-allocation { border-radius: 12px; overflow: hidden; }
@media (prefers-reduced-motion: no-preference) {
  [data-enhanced] [data-scene]:not([hidden]) .flow-node.is-current { transition: background-color 240ms var(--ease); }
}

.step-explainer { --muted: var(--diagram-muted); }
.step-explainer .flow-node span, .step-explainer .data-packet > small, .step-explainer .data-packet > div > span, .step-explainer .distributed-chips span, .step-explainer .memory-tiers span { font-size: 13px; }
.step-index { font-size: 13px; }
.step-index > summary { color: var(--green); cursor: pointer; padding-block: 10px; min-height: 44px; }
.step-index[open] > summary { margin-bottom: 8px; }
.step-transport [data-next]:enabled { background: var(--green); color: var(--surface); border-color: var(--green); }
.step-transport [data-next]:hover:enabled { background: var(--green-hover); color: var(--surface); }