/* Light, print-like UI over a full-bleed canvas. Sized to sit in an iframe in
   a blog post as happily as it does full screen. */

/* These mirror the site palette in static/css/style.css so the embed reads as
   part of the post; keep --ink/--text, --muted, --rule and --accent in sync
   when the site's change. Kept self-contained so the page opens from disk. */
:root {
  --ink: #24292e;
  --muted: #6a737d;
  --rule: #e3e6e8;
  --accent: #05a081;
  --panel: rgba(255, 255, 255, 0.94);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #dfe6ea;
  color: var(--ink);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

#scene { display: block; width: 100vw; height: 100vh; }

.hud {
  position: absolute;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.6rem 0.75rem;
  /* No backdrop-filter: the panel is already 94% opaque, and a backdrop blur
     over a canvas that repaints every frame makes the compositor re-sample
     the region under the panel each time — visible as a flicker at the panel
     edges. */
}

/* controls + the run's own table of contents */
.hud-top { top: 0.75rem; left: 0.75rem; }

.bar { display: flex; flex-wrap: wrap; gap: 0.35rem; }

.bar button {
  font: 600 11px/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
}
.bar button:hover { border-color: var(--accent); color: var(--accent); }

/* Whichever control starts the run is the loud one. */
.bar button.is-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 1px 3px rgba(5, 160, 129, 0.4);
}
.bar button.is-primary:hover { background: #048d72; color: #fff; }

/* Click-to-start. The scene is drawn underneath it, so the reader sees the
   campus at rest and one obvious way to set it going. */
.start {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border: 0;
  padding: 0;
  background: rgba(223, 230, 234, 0.55);
  cursor: pointer;
  font: inherit;
  color: var(--ink);
}
.start[hidden] { display: none; }

.start-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4.5rem;
  height: 4.5rem;
  padding-left: 0.35rem;          /* the glyph's own bearing is off-centre */
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 1.9rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
  transition: transform 0.15s ease;
}
.start:hover .start-badge { transform: scale(1.06); }
.start:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; }

.start-label { font-size: 1.05rem; font-weight: 600; }
.start-note { font-size: 0.82rem; color: var(--muted); }

.steps {
  list-style: none;
  margin: 0.6rem 0 0;
  padding: 0;
  font: 11px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--muted);
}
.steps li { padding-left: 1rem; position: relative; }
.steps li::before {
  content: "○";
  position: absolute;
  left: 0;
}
.steps li.is-done { color: var(--ink); }
.steps li.is-done::before { content: "●"; color: var(--accent); }
.steps li.is-here { color: var(--accent); font-weight: 700; }
.steps li.is-here::before { content: "▶"; color: var(--accent); }

/* the write-up for the stop the van is at */
.hud-copy {
  left: 0.75rem;
  bottom: 0.75rem;
  width: min(30rem, calc(100vw - 1.5rem));
}
.hud-copy h1 { margin: 0 0 0.3rem; font-size: 0.95rem; letter-spacing: 0.02em; }
.hud-copy p { margin: 0; font-size: 0.86rem; color: #3b444c; }

/* the live numbers */
.hud-counts { top: 0.75rem; right: 0.75rem; width: 17.5rem; }
.hud-counts h2 {
  margin: 0 0 0.4rem;
  font: 700 10px/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 0 0.5rem;
  padding: 0.15rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.row .k { font-size: 0.8rem; }
.row .v {
  font: 700 0.85rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--accent);
}
.row .n {
  grid-column: 1 / -1;
  font-size: 0.7rem;
  color: var(--muted);
}

/* Narrow embeds: the numbers panel drops under the controls rather than
   fighting them for the top-right corner. */
@media (max-width: 46rem) {
  /* In a blog iframe the panels are competing with the campus for room. The
     station list goes horizontal so the top-left panel stops covering the
     first two buildings, and the write-up is capped and scrolls. */
  .hud { padding: 0.45rem 0.55rem; }
  .hud-top { right: 0.75rem; }
  .steps {
    display: flex;
    flex-wrap: wrap;
    gap: 0 0.7rem;
    margin-top: 0.45rem;
    font-size: 10px;
  }
  .steps li { padding-left: 0.85rem; }
  .hud-counts {
    top: auto;
    bottom: 0.75rem;
    right: 0.75rem;
    width: 11.5rem;
  }
  .row .n { display: none; }
  .hud-copy {
    width: calc(100% - 13.5rem);
    max-height: 8.5rem;
    overflow: auto;
  }
  .hud-copy p { font-size: 0.78rem; }
}