/* ============================================================
   About page: the story motion and the read-through
   ------------------------------------------------------------
   The site-wide skin (screens, hues, stripes, rail, hero,
   band, footer) lives in css/site.css. This file holds only
   what is specific to the about page: the typed hero, the
   sentence that assembles as you scroll, the site's own
   record, and the end moment.

   Everything here has a still fallback: reduced motion and
   teacher mode get the same content, shown without movement.
   ============================================================ */

/* ---------- the typed hero ---------- */

/* the title types from empty, so reserve a line and the copy below does not jump */
.hero h1 { min-height: 1.15em; }

.typed-cursor {
  display: inline-block;
  width: 0.08em; height: 0.9em;
  margin-left: 0.06em;
  vertical-align: -0.08em;
  background: currentColor;
  animation: about-blink 900ms steps(2, start) infinite;
}
@keyframes about-blink { to { visibility: hidden; } }

/* the copy under the hero waits for the title, then steps in one by one */
.after-typed { opacity: 0; transform: translateY(10px); transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out); }
.after-typed.is-shown { opacity: 1; transform: none; }

/* ---------- the one sentence: it assembles as you scroll ---------- */

.assemble-stage { margin-top: var(--sp-5); }
.assemble-stage.is-pinned { height: calc(100vh + 120vh); }
.assemble-stage.is-pinned .assemble-scene { position: sticky; top: 72px; }
.assemble-scene { display: grid; min-height: 70vh; align-content: center; }
.assemble-line {
  margin: 0 auto;
  max-width: 30ch;
  font-size: var(--fs-6);
  line-height: 1.3;
  text-align: center;
}
.assemble-line .w { display: inline-block; }

/* ---------- the site's own record ---------- */

/* the evidence-style block: mono labels, like the transcript labels on page one */
.about-cite {
  margin: var(--sp-6) 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-2) var(--sp-5);
}
.about-cite > div {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--border);
}
.about-cite > div:first-child { border-top: none; }
.about-cite dt {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding-top: 0.2em;
}
.about-cite dd { margin: 0; }
@media (max-width: 600px) {
  .about-cite > div { grid-template-columns: 1fr; gap: var(--sp-1); }
}

/* ---------- the end ---------- */

/* Base state is "shown". JavaScript marks the moment pending on
   load, so without JS nothing on this page is ever hidden. */
.end-moment { margin-top: var(--sp-6); text-align: center; }
.end-line {
  margin: 0 auto;
  max-width: 34ch;
  font-size: var(--fs-4);
  color: var(--text-2);
  opacity: 1;
  transition: opacity 400ms var(--ease-out);
}
.end-stamp {
  display: inline-block;
  margin-top: var(--sp-5);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 2px solid currentColor;
  border-radius: 6px;
  padding: 0.55em 1em;
  opacity: 1;
  transform: scale(1) rotate(-3deg);
  transition: opacity 450ms var(--ease-out), transform 450ms var(--ease-out);
}
.end-close {
  margin: var(--sp-5) auto 0;
  max-width: 42ch;
  color: var(--text-2);
  opacity: 1;
  transform: none;
  transition: opacity 600ms var(--ease-out) 150ms, transform 600ms var(--ease-out) 150ms;
}
.end-moment.is-pending .end-line { opacity: 0; }
.end-moment.is-pending .end-stamp { opacity: 0; transform: scale(1.5) rotate(-6deg); }
.end-moment.is-pending .end-close { opacity: 0; transform: translateY(8px); }
/* the line appears when the moment starts playing, before the typing is done */
.end-moment.is-playing .end-line { opacity: 1; }

.credits {
  margin-top: var(--sp-6);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  color: var(--muted);
  text-align: center;
}

/* ---------- still fallbacks ---------- */

@media (prefers-reduced-motion: reduce) {
  .typed-cursor { animation: none; }
  .after-typed,
  .end-line,
  .end-stamp,
  .end-close { transition: none; }
  .assemble-stage.is-pinned { height: auto; }
  .assemble-stage.is-pinned .assemble-scene { position: static; min-height: 0; }
}