/* Core Memory — a Logical Art nibble.
 *
 * Shell first, neutral accent. Ferrite is a dark grey-brown that varies by
 * batch and by photograph, so there is nothing reliable to sample and the
 * machine takes the studio neutral through --machine.
 *
 * Two things earn colour, and only two: a core carrying enough current to flip,
 * and a bit that has been destroyed and not written back. Both are events
 * rather than decoration.
 */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--la-font-ui);
  background: var(--la-page);
  color: var(--la-ink);
  line-height: var(--la-leading-body);
  -webkit-font-smoothing: antialiased;
}

main.nibble {
  max-width: var(--la-measure);
  margin: 0 auto;
  padding: 3rem 1.25rem 3rem;
}

main.nibble p, main.nibble ul, main.nibble ol, main.nibble dl,
main.nibble h1, main.nibble h2 { max-width: none; }

.cm-sr {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}



/* ---- Stage labels. Same shape as Interleave: this is the tier's mark. ---- */
.cm { margin-top: var(--la-space-5); }

.cm-steplabel {
  display: flex;
  align-items: center;
  gap: var(--la-space-2);
  margin-top: var(--la-space-4);
  margin-bottom: var(--la-space-2);
  font-family: var(--la-font-mono);
  font-size: var(--la-text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--la-ink-faint);
}

.cm-stepno {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  flex: none;
  border: 1px solid var(--la-hairline-strong);
  border-radius: 50%;
  color: var(--la-ink-dim);
}

/* ---- 1. The plane -------------------------------------------------------- */
.cm-planewrap {
  border: 1px solid var(--la-hairline);
  border-radius: var(--la-radius);
  background: var(--la-sunken);
  padding: var(--la-space-3);
  overflow-x: auto;
}

.cm-plane {
  display: grid;
  grid-template-columns: repeat(8, minmax(2rem, 1fr));
  gap: 0.35rem;
  min-width: 17rem;
}

.cm-core {
  aspect-ratio: 1 / 1;
  font-family: var(--la-font-mono);
  font-size: var(--la-text-sm);
  line-height: 1;
  color: var(--la-ink-faint);
  background: var(--la-raised);
  /* A core is a ring. */
  border: 3px solid var(--la-hairline-strong);
  border-radius: 50%;
  cursor: pointer;
  transition: border-color var(--la-transition), color var(--la-transition),
              background var(--la-transition), transform var(--la-transition);
}

.cm-core:hover { border-color: var(--la-ink-faint); }

/* Holding a one: magnetised the other way. */
.cm-core.is-one {
  color: var(--la-ink);
  border-color: var(--la-ink-dim);
}

/* Half a current. Visibly touched, and visibly not moving. */
.cm-core.is-half {
  border-color: color-mix(in srgb, var(--machine) 42%, var(--la-hairline-strong));
  background: color-mix(in srgb, var(--machine) 7%, transparent);
}

/* Enough to flip. The one event on the page worth a colour. */
.cm-core.is-full {
  border-color: var(--machine);
  background: color-mix(in srgb, var(--machine) 24%, transparent);
  color: var(--la-ink);
  transform: scale(1.06);
}

.cm-core.is-selected { outline: 2px solid var(--machine); outline-offset: 3px; }
.cm-core:focus-visible { outline: 2px solid var(--machine); outline-offset: 3px; }

.cm-note {
  margin-top: var(--la-space-2);
  font-family: var(--la-font-mono);
  font-size: var(--la-text-xs);
  color: var(--la-ink-faint);
}

.cm-controls {
  margin-top: var(--la-space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--la-space-2);
}

.cm-button {
  font: inherit;
  font-size: var(--la-text-sm);
  color: var(--la-ink);
  background: var(--la-raised);
  border: 1px solid var(--la-hairline-strong);
  border-radius: var(--la-radius-sm);
  padding: 0.4em 0.85em;
  cursor: pointer;
  transition: border-color var(--la-transition), color var(--la-transition),
              opacity var(--la-transition);
}

.cm-button:hover:not(:disabled) { border-color: var(--machine); color: var(--machine); }
.cm-button:focus-visible { outline: 2px solid var(--machine); outline-offset: 3px; }
.cm-button:disabled { opacity: 0.4; cursor: default; }
.cm-ghost { color: var(--la-ink-faint); }

/* ---- 2. The sense wire --------------------------------------------------- */
.cm-sense {
  display: flex;
  align-items: center;
  gap: var(--la-space-3);
  border: 1px solid var(--la-hairline);
  border-radius: var(--la-radius);
  background: var(--la-sunken);
  padding: var(--la-space-2) var(--la-space-3);
}

.cm-senselabel {
  flex: 0 0 auto;
  font-family: var(--la-font-mono);
  font-size: var(--la-text-xs);
  color: var(--la-ink-faint);
}

.cm-scope { display: block; flex: 1 1 auto; width: 100%; height: auto; min-width: 0; }

.cm-baseline { stroke: var(--la-hairline); stroke-width: 1; }

.cm-trace {
  fill: none;
  stroke: var(--la-hairline-strong);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.cm-trace.is-pulse { stroke: var(--machine); stroke-width: 3; }

/* ---- 4. Output ----------------------------------------------------------- */
.cm-out {
  margin-top: var(--la-space-2);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--la-space-3);
}

.cm-out div { border-top: 1px solid var(--la-hairline); padding-top: var(--la-space-2); }

.cm-out dt {
  font-family: var(--la-font-mono);
  font-size: var(--la-text-xs);
  color: var(--la-ink-faint);
}

.cm-out dd {
  margin-top: 0.2rem;
  font-family: var(--la-font-mono);
  font-size: var(--la-text-base);
  color: var(--la-ink);
}

.cm-verdictline {
  margin-top: var(--la-space-3);
  font-family: var(--la-font-mono);
  font-size: var(--la-text-sm);
  color: var(--la-ink-dim);
  border-left: 2px solid var(--la-hairline);
  padding-left: var(--la-space-2);
  min-height: 2.6em;
}

.cm-verdictline.is-owed { border-left-color: var(--machine); color: var(--la-ink); }
.cm-verdictline.is-lost { border-left-color: #8c1d16; color: #e0736a; }

/* ---- Prose --------------------------------------------------------------- */
.cm-why { margin-top: var(--la-space-6); }

main.nibble section h2 {
  font-family: var(--la-font-display);
  font-size: var(--la-text-xl);
  line-height: var(--la-leading-tight);
  letter-spacing: -0.01em;
}

.cm-why p { margin-top: var(--la-space-2); color: var(--la-ink-dim); }
.cm-why strong { color: var(--la-ink); }
.cm-why em { font-style: italic; }

main.nibble .la-faq,
main.nibble section { margin-top: var(--la-space-6); }
main.nibble .la-faq details { margin-top: var(--la-space-3); }
main.nibble footer { margin-top: var(--la-space-6); }

@media (max-width: 40rem) {
  main.nibble { padding-top: 2rem; }
  .cm-planewrap { padding: var(--la-space-2); }
  .cm-plane { gap: 0.25rem; }
  .cm-core { border-width: 2px; font-size: var(--la-text-xs); }
  .cm-sense { flex-direction: column; align-items: flex-start; gap: var(--la-space-2); }
}

@media (prefers-reduced-motion: reduce) {
  .cm-core, .cm-button { transition: none; }
}