.slide-foundation .slide-content {
  width: 100%;
  padding: 48.64px 64px;
}

.slide-foundation .eyebrow { margin-bottom: 0.6rem; }

.slide-foundation h2 {
  max-width: none;
  font-size: 61.44px;
}

.foundation-canvas {
  margin-top: 38.4px;
}

.foundation-stage {
  opacity: 0.16;
  transform: translateY(0.5rem);
  transition:
    opacity 280ms ease,
    transform 340ms ease,
    border-color 240ms ease,
    box-shadow 240ms ease;
}

.foundation-stage.is-revealed { opacity: 0.5; transform: translateY(0); }
.foundation-stage.is-current { opacity: 1; transform: translateY(0); }

.foundation-label {
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.foundation-stage h3 {
  margin: 0.35rem 0 0.8rem;
  font-size: 21.12px;
}

.foundation-caption {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 12px;
}

.matrix-timeline {
  display: grid;
  grid-template-columns: minmax(15rem, 0.82fr) auto minmax(23rem, 1.2fr);
  gap: 25.6px;
  align-items: center;
}

.matrix-view,
.timeline-view {
  min-height: 13.5rem;
  padding: 25.6px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.foundation-stage.is-current.matrix-view,
.foundation-stage.is-current.timeline-view {
  border-color: rgb(8 127 115 / 45%);
  box-shadow: 0 14px 34px rgb(23 32 31 / 8%);
}

.interaction-matrix {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.42rem;
  max-width: 15rem;
}

.matrix-cell {
  aspect-ratio: 1.45;
  border-radius: 5px;
  background: #ebece8;
}

.matrix-cell.is-hit { background: var(--teal); }

.foundation-bridge {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  white-space: nowrap;
}

.event-track {
  display: flex;
  align-items: center;
  gap: 10.24px;
  margin-top: 1.3rem;
}

.event-node {
  width: 57.6px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  position: relative;
  border-radius: 13px;
  background: var(--accent);
  color: white;
}

.event-node-b { background: var(--teal); }
.event-node-c { background: #596bc6; }
.event-node strong { font-size: 1.35rem; }
.event-node span { position: absolute; right: 0.35rem; bottom: 0.22rem; font-size: 0.55rem; opacity: 0.75; }
.event-arrow { color: #98a29f; font-size: 1.2rem; }

.foundation-takeaway {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.85rem 1rem;
  border: 1px solid rgb(8 127 115 / 25%);
  border-radius: 14px;
  background: #edf4f2;
}

.foundation-chips { display: flex; gap: 0.45rem; }
.foundation-chips span { padding: 0.32rem 0.6rem; border-radius: 999px; background: white; color: var(--teal); font-size: 0.72rem; font-weight: 850; }

.events-examples,
.movielens-rationale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20.48px;
}

.raw-events,
.example-construction,
.rationale-card {
  padding: 23.04px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.foundation-stage.is-current.raw-events,
.foundation-stage.is-current.example-construction,
.foundation-stage.is-current.rationale-card {
  border-color: rgb(8 127 115 / 45%);
  box-shadow: 0 12px 30px rgb(23 32 31 / 8%);
}

.event-table { display: grid; gap: 0.28rem; }
.event-row { display: grid; grid-template-columns: 0.8fr 0.6fr 0.9fr 0.8fr; gap: 0.4rem; padding: 0.35rem 0.5rem; border-radius: 7px; background: #f2f3f0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.72rem; }
.event-header { background: var(--ink); color: white; font-weight: 800; }

.training-sequence { display: flex; align-items: center; gap: 0.5rem; margin-top: 1.8rem; }
.history-token, .target-token { width: 3.3rem; height: 3.3rem; display: grid; place-items: center; position: relative; border-radius: 11px; background: var(--teal); color: white; font-size: 1.2rem; font-weight: 850; }
.target-token { margin-left: 0.5rem; border: 2px dashed var(--accent); background: #fff7f3; color: var(--accent-dark); }
.target-token small { position: absolute; top: calc(100% + 0.25rem); font-size: 0.55rem; text-transform: uppercase; }
.sequence-arrow { color: var(--muted); font-size: 1.3rem; }

.time-contract { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(18rem, 1.2fr) minmax(20rem, 1fr); gap: 1rem; align-items: center; padding: 0.85rem 1rem; border-radius: 14px; background: #edf4f2; }
.time-contract p { margin: 0; font-size: 14.08px; font-weight: 700; }
.time-split { display: grid; grid-template-columns: 3fr 1fr 1fr; overflow: hidden; border-radius: 8px; color: white; font-size: 0.72rem; font-weight: 850; text-align: center; }
.time-split span { padding: 0.55rem 0.35rem; }
.train-split { background: var(--teal); }
.valid-split { background: #5e9f98; }
.test-split { background: var(--accent); }

.rationale-card h3 { margin-top: 0; }
.teaching-card { border-top: 5px solid var(--teal); }
.evidence-card { border-top: 5px solid var(--accent); }
.foundation-points { display: grid; gap: 0.75rem; margin: 0; padding: 0; list-style: none; }
.foundation-point { display: grid; grid-template-columns: 0.75rem minmax(0, 1fr); gap: 0.65rem; align-items: start; color: var(--muted); font-size: 13.6px; }
.foundation-point-dot { width: 0.62rem; height: 0.62rem; margin-top: 0.28rem; border-radius: 50%; background: var(--teal); }
.evidence-card .foundation-point-dot { background: var(--accent); }
.movielens-takeaway { justify-content: center; text-align: center; }
.slide-foundation .slide-footer { margin-top: 0.9rem; font-size: 0.75rem; font-weight: 700; }

@media (prefers-reduced-motion: reduce) {
  .foundation-stage { transition: none; }
}