@import url("../../reinforcement_learning/lessons/style.css");

/* AI Compilers — "From Graph to Kernel" track.
   Local helpers layered on the shared RL gold-standard sheet. Mirrors the
   cs336 helper set (kicker / source-note / trade-table / lesson-flow /
   position-grid) plus two compiler-specific helpers: an IR "lowering ladder"
   and a horizontal "pass pipeline". Do NOT redefine shared classes
   (.widget, .kpi, .callout, .math, .diagram, .topic-grid, .prompt-list, …). */

.kicker {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}

.source-note {
  border-left-color: var(--accent-2);
}

.position-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}

.position-grid div {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 12px 14px;
}

.position-grid strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}

.position-grid span {
  display: block;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.45;
}

.lesson-flow {
  display: grid;
  gap: 10px;
  margin: 18px 0;
}

.lesson-flow div {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 12px 14px;
}

.lesson-flow strong {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}

.lesson-flow span {
  color: var(--text-mute);
  font-size: 14px;
}

.trade-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}

.trade-table th,
.trade-table td {
  border: 1px solid var(--border);
  padding: 9px 11px;
  text-align: left;
  vertical-align: top;
}

.trade-table th {
  background: var(--bg-elev);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text);
}

/* IR "lowering ladder" — stacked levels from high (portable) to low (specialized).
   Each rung is one IR level; descending trades portability for hardware control. */
.ir-ladder {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}
.ir-ladder .rung {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 10px 14px;
}
.ir-ladder .rung .lvl {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
}
.ir-ladder .rung .desc {
  color: var(--text-mute);
  font-size: 13.5px;
  line-height: 1.45;
}
.ir-ladder .rung:nth-child(1) { border-left-color: var(--accent); }
.ir-ladder .rung:nth-child(2) { border-left-color: var(--accent-2); }
.ir-ladder .rung:nth-child(3) { border-left-color: #7c3aed; }
.ir-ladder .rung:nth-child(4) { border-left-color: var(--ok); }

/* horizontal "pass pipeline" — the five compiler stages as connected chips. */
.pass-pipe {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: stretch;
  margin: 18px 0;
}
.pass-pipe .stage {
  flex: 1 1 0;
  min-width: 120px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 10px 12px;
  position: relative;
}
.pass-pipe .stage .s-name {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 4px;
}
.pass-pipe .stage .s-body {
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.4;
}
.pass-pipe .stage.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}

.toc-card .path {
  margin-top: 6px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.4;
}

@media (max-width: 820px) {
  .position-grid { grid-template-columns: 1fr; }
  .lesson-flow div { grid-template-columns: 1fr; }
  .ir-ladder .rung { grid-template-columns: 1fr; }
}