/* Landing mini-explainer strip — the Tonnetz mapping, below the §01 cards. */
.tonnetz-strip {
  margin-top: var(--pi-space-8);
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  padding: clamp(20px, 3vw, 40px);
  background: var(--pi-surface);
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius-lg);
}
.tonnetz-strip__stage { position: relative; width: 100%; min-width: 0; }
#tonnetz-map {
  width: 100%;
  height: clamp(400px, 50vw, 560px);
  display: block;
  /* fade the canvas edges so cell glow doesn't hard-clip against the border */
  -webkit-mask-image: radial-gradient(135% 128% at 50% 58%, #000 78%, transparent 100%);
          mask-image: radial-gradient(135% 128% at 50% 58%, #000 78%, transparent 100%);
}
.tonnetz-strip__caption {
  margin: var(--pi-space-3) 0 0;
  min-height: 2.8em;              /* reserve space so the line count can't shift layout */
  text-align: center;
  color: var(--pi-bone);
  font-size: var(--pi-text-sm);
  line-height: 1.4;
  transition: opacity var(--pi-dur-base) var(--pi-ease);
}
.tonnetz-strip__copy h3 {
  font-family: var(--pi-font-display);
  font-size: var(--pi-text-xl);
  line-height: 1.15;
  margin: 0 0 var(--pi-space-3);
}
.tonnetz-strip__copy p {
  color: var(--pi-fg-muted);
  max-width: 46ch;
  margin: 0 0 var(--pi-space-5);
}
.tonnetz-strip__copy .lede em { color: var(--pi-bone); font-style: italic; }
.tonnetz-strip__note {
  font-family: var(--pi-font-tag);
  font-size: var(--pi-text-xs);
  letter-spacing: var(--pi-track-eyebrow);
  color: var(--pi-fg-subtle);
  text-transform: uppercase;
  margin-top: var(--pi-space-4);
}

@media (max-width: 860px) {
  .tonnetz-strip { grid-template-columns: 1fr; }
  #tonnetz-map { height: clamp(380px, 92vw, 560px); }
}