/* ============================================================
   Pikt — build scene
   A sticky stage the reader scrolls past, with the page's own
   copy carried over it as cards. Everything takes its colour and
   type from tokens/*.css; nothing is defined here that isn't.
   Loaded after site.css on pages that carry a .build section.
   ============================================================ */

.build { position: relative; background: var(--surface-page); }

/* ---------- stage ---------- */
.build__stage { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; z-index: 0; }
.build__canvas, .build__canvas canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

/* ---------- chapters over the stage ---------- */
.build__chapters { position: relative; z-index: 2; margin-top: -100vh; margin-top: -100svh; pointer-events: none; }
/* every chapter the same height and the card centred in it, so the gap between cards is
   uniform as the reader scrolls; the last chapter carries a little extra so the finished
   building is seen before the stage releases */
.build__ch { min-height: 100vh; min-height: 100svh; display: flex; align-items: center; }
.build__ch:last-child { padding-bottom: 12vh; }
.build__card {
  pointer-events: auto; max-width: 520px; margin: 84px 0 56px;
  background: rgba(247, 245, 241, .86);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft); border-radius: var(--radius-md);
  padding: 26px 28px 28px;
}
.build__card .h2 { margin-top: 0; }
.build__card .lead { margin-top: 14px; }
.build__card .pstep { display: block; border-top: 0; padding: 0; }
.build__card .pstep__n { margin-bottom: 14px; }
.build__card .pstep__b h3 { font-size: clamp(22px, 2.3vw, 28px); letter-spacing: -0.03em; line-height: 1.1; text-wrap: balance; }
.build__card .pstep__b p { font-size: 15.5px; }

/* ---------- home: the connector cards ---------- */
.build__card .conn, .build__card .conn--lg { border: 0; padding: 0; background: none; box-shadow: none; }
.build__card .conn__ic { margin-bottom: 14px; }
.build__card .conn h3, .build__card .conn--lg h3 { margin: 0; font-size: clamp(22px, 2.3vw, 28px); letter-spacing: -0.03em; line-height: 1.1; }
.build__card .conn p, .build__card .conn--lg p { margin-top: 10px; font-size: 15.5px; color: var(--text-secondary); max-width: 52ch; }

/* ---------- pins in the scene ---------- */
.build__pins { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
.build__pin { position: absolute; left: 0; top: 0; transform: translate(-50%, -100%); opacity: 0; transition: opacity .35s; will-change: transform; }
.build__pin.is-on { opacity: 1; }
.build__pin-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); margin: 0 auto; position: relative; }
.build__pin-dot::after { content: ""; position: absolute; inset: -8px; border-radius: 50%; border: 1.5px solid var(--accent); opacity: 0; animation: build-pulse 1.6s ease-out infinite; }
.build__pin.is-on .build__pin-dot::after { opacity: 1; }
@keyframes build-pulse { 0% { transform: scale(.4); opacity: .9; } 100% { transform: scale(1.6); opacity: 0; } }
.build__pin-card { position: absolute; left: 14px; bottom: 2px; white-space: nowrap; background: var(--surface-ink); color: var(--text-on-ink); padding: 8px 11px; border-radius: var(--radius-md); font-size: 12.5px; line-height: 1.35; box-shadow: 0 6px 20px rgba(14, 18, 23, .18); }
.build__pin.is-left .build__pin-card { left: auto; right: 14px; }
.build__pin-card b { font-weight: 600; }
.build__pin-card.is-flag { background: var(--accent); }
.build__pin-card.is-flag small { color: rgba(255,255,255,.8); }
.build__pin-card small { display: block; font-family: var(--font-mono); font-size: 11px; color: var(--text-on-ink-dim); margin-top: 2px; }

/* ---------- site record panel ---------- */
.build__rec {
  position: absolute; top: 70px; right: clamp(20px, 4vw, 48px); z-index: 3; width: 300px;
  background: rgba(247, 245, 241, .9);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft); border-radius: var(--radius-md);
  padding: 14px 16px 12px; font-size: 12.5px; color: var(--text-primary);
  transition: opacity .4s;
}
.build__rec.is-hidden { opacity: 0; pointer-events: none; }
.build__rec.is-focus { opacity: 1; border-color: var(--ink-900); }
.build__rec.is-focus .build__floors .b i { background: var(--accent); }
.build__rec-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.build__rec-head b { font-weight: 600; font-size: 13px; letter-spacing: -0.01em; }
.build__rec-head span { font-family: var(--font-mono); font-size: 11px; color: var(--text-tertiary); font-variant-numeric: tabular-nums; }
.build__rec-sub { color: var(--text-tertiary); font-size: 11.5px; margin-top: 2px; }
.build__rec-stats { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; margin: 12px 0 10px; }
.build__rec-stats > div { border-top: 1px solid var(--border-soft); padding-top: 6px; }
.build__rec-stats b { display: block; font-family: var(--font-mono); font-weight: 500; font-size: 16px; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.build__rec-stats span { display: block; font-size: 10.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--text-tertiary); margin-top: 1px; }
.build__rec-lab { font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--text-tertiary); margin: 10px 0 5px; }
.build__floors { display: grid; grid-template-columns: auto 1fr auto auto; gap: 3px 10px; font-family: var(--font-mono); font-size: 11px; font-variant-numeric: tabular-nums; align-items: center; }
.build__floors .h { font-size: 10.5px; color: var(--text-tertiary); letter-spacing: .04em; text-transform: uppercase; }
.build__floors .b { height: 4px; background: var(--border-soft); border-radius: 2px; position: relative; overflow: hidden; }
.build__floors .b i { position: absolute; left: 0; top: 0; bottom: 0; background: var(--ink-900); width: 0; transition: width .4s; }
.build__floors .pl { color: var(--text-tertiary); }
.build__floors .rc { color: var(--text-primary); }
.build__floors .rc.is-wait { color: var(--border); }
.build__ledger { list-style: none; margin: 0; padding: 0; max-height: 150px; overflow: hidden; position: relative; }
.build__ledger::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 34px; background: linear-gradient(rgba(247, 245, 241, 0), rgba(247, 245, 241, .95)); pointer-events: none; }
.build__ledger li { display: grid; grid-template-columns: 52px 1fr; gap: 8px; padding: 4px 0; border-top: 1px solid var(--border-soft); line-height: 1.35; }
.build__ledger li:first-child { border-top: 0; }
.build__ledger .t { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-tertiary); font-variant-numeric: tabular-nums; padding-top: 1px; }
.build__ledger .s { font-size: 12px; }
.build__ledger .s small { display: block; color: var(--text-tertiary); font-size: 11px; }
.build__ledger .s.is-flag { color: var(--accent); font-weight: 600; }
.build__rec-foot { margin-top: 8px; font-size: 10.5px; color: var(--text-tertiary); border-top: 1px solid var(--border-soft); padding-top: 6px; }

/* ---------- progress rail ---------- */
.build__rail { position: absolute; left: 0; right: 0; bottom: 0; z-index: 3; height: 34px; display: flex; align-items: flex-end; padding: 0 clamp(20px, 4vw, 48px) 12px; pointer-events: none; }
.build__rail-track { position: relative; flex: 1; height: 1px; background: var(--border); }
.build__rail-fill { position: absolute; left: 0; top: 0; height: 100%; width: 0; background: var(--ink-900); }
.build__rail-day { position: absolute; top: -22px; transform: translateX(-50%); font-family: var(--font-mono); font-size: 11px; color: var(--text-tertiary); white-space: nowrap; font-variant-numeric: tabular-nums; }
.build__rail-tick { position: absolute; top: -3px; width: 1px; height: 7px; background: var(--border); }
.build__rail-lab { position: absolute; top: 6px; transform: translateX(-50%); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--text-tertiary); white-space: nowrap; }

/* ---------- no WebGL: plain flowing content ---------- */
.build.is-static .build__stage { display: none; }
.build.is-static .build__chapters { margin-top: 0; padding: clamp(56px, 7vw, 96px) 0; }
.build.is-static .build__ch { min-height: 0; align-items: stretch; padding: 0; }
.build.is-static .build__card { max-width: none; margin: 0; padding: clamp(28px, 3.4vw, 44px) 0; background: none; border: 0; border-top: 1px solid var(--border-soft); border-radius: 0; backdrop-filter: none; -webkit-backdrop-filter: none; }
.build.is-static .build__ch:first-child .build__card { border-top: 0; padding-top: 0; }
.build.is-static .build__card .pstep { display: grid; }

/* ---------- still frames (image export) ---------- */
.build.is-still .build__rec { transition: none; }
.build.is-still .build__rec.is-off { display: none; }
.build.is-still .build__floors, .build.is-still .build__floors + .build__rec-lab, .build.is-still .build__rec-lab:first-of-type { display: none; }

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .build__pin-dot::after { animation: none; }
  .build__pin, .build__rec, .build__floors .b i { transition: none; }
}

/* ---------- narrow viewports ---------- */
@media (max-width: 900px) {
  .build__ch { align-items: flex-end; padding-bottom: 24vh; }
  .build__ch:last-child { padding-bottom: 24vh; }
  .build__card { max-width: none; margin: 72px 0 0; padding: 18px 18px 20px; }
  .build--opener .build__ch:last-child { align-items: flex-end; padding-bottom: 24vh; }
  .build__pin-card { display: none; }
  .build__rec { top: auto; bottom: 44px; left: 12px; right: 12px; width: auto; padding: 10px 12px; }
  .build__rec-sub, .build__rec-lab, .build__floors, .build__rec-foot { display: none; }
  .build__rec-stats { margin: 8px 0 6px; }
  .build__ledger { max-height: 56px; }
  .build__rail-lab { display: none; }
}