/* /signal-vs-noise — centred column scaffold + the play/reveal surface.
   Shared bits come from tokens/page/about/controls/mobile.css. */
.wrap{max-width:var(--w-instrument);margin:0 auto;padding-inline:16px;display:flex;flex-direction:column;gap:20px}
header{display:flex;flex-direction:column;gap:2px}
.card{background:var(--card);border:1px solid var(--border);border-radius:0;
  box-shadow:var(--shadow);padding:20px}

/* the play grid / collapse SVG: fill the card, scale to width, never sideways-scroll
   below legibility — the grid re-lays-out (cols flip) rather than shrinking */
#stage{overflow-x:auto}
#stage svg{display:block;width:100%;height:auto;max-width:100%}
#stage [data-act]{cursor:pointer}
#stage [data-act]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* The loop is the exercise's actual structure, so it stays visible without
   becoming a second set of instructions. The current phase earns the weight. */
.learning-trace{display:flex;align-items:center;gap:0;list-style:none;margin:0 0 14px;padding:0;
  color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.09em;text-transform:uppercase}
.learning-trace li{display:flex;align-items:center;white-space:nowrap}
.learning-trace li:not(:last-child)::after{content:'→';margin:0 8px;color:var(--border);font-size:13px;font-weight:400}
.learning-trace .is-current{color:var(--accent)}

/* the commit toolbar */
.toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:16px}
.note{color:var(--muted);font-size:13px;max-width:52ch}
.rangelab{display:inline-flex;align-items:center;gap:10px;font-size:11px;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.rangelab input[type=range]{width:120px;accent-color:var(--accent)}

/* between-turn reveal — how your conversations "landed" (no truth yet) */
#reveal{margin-top:18px;border-top:1px solid var(--border);padding-top:16px}
#reveal h3{font-family:"Helvetica Neue",Helvetica,"Segoe UI",Roboto,sans-serif;font-size:16px;margin:0 0 12px}
.rvl-none{color:var(--muted);font-size:13.5px;margin:0}
.rvl-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.rvl-card{border:1px solid var(--border);border-radius:0;padding:12px 14px;background:var(--bg)}
.rvl-card.lesson{border-color:color-mix(in srgb,var(--err) 45%,var(--border))}
.rvl-top{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:6px}
.rvl-name{font-weight:650;font-size:13.5px}
.rvl-move{font-family:ui-monospace,Menlo,monospace;font-variant-numeric:tabular-nums;
  font-size:13px;color:var(--muted)}
.rvl-card p{margin:0;font-size:13px;line-height:1.5;color:var(--ink)}
.rvl-card.lesson p{color:var(--err)}
.rvl-ledger{margin-top:14px;font-size:12.5px;color:var(--muted);
  display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.rvl-led-h{font-weight:600}
.rvl-ledger .chip{background:color-mix(in srgb,var(--err) 10%,transparent);
  border:1px solid color-mix(in srgb,var(--err) 35%,var(--border));
  color:var(--err);border-radius:0;padding:3px 11px;font-size:12px;font-weight:600}

/* Collapse receipt: the personal correction belongs directly beneath the
   artefact that proves it, rather than in a competing conclusion card. */
.receipt{border-top:1px solid var(--border);margin-top:18px;padding-top:14px;max-width:70ch}
.receipt-kicker{margin:0 0 4px;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
.receipt h2{font-family:"Helvetica Neue",Helvetica,"Segoe UI",Roboto,sans-serif;font-size:17px;line-height:1.2;margin:0 0 8px}
.lessons{font-size:14px;line-height:1.55;color:var(--ink);margin:0;max-width:70ch}
.lessons s{color:var(--muted);text-decoration-color:var(--err)}

/* Actions after the verdict are deliberately a utility band: available, but
   quieter than the conclusion above it. */
.utility-band{border-top:1px solid var(--border);padding:2px 4px 0}
.utility-band .toolbar{margin-top:12px}
.utility-band .actions{margin-top:10px}

@media (pointer:coarse){
  .btn{min-height:44px;display:inline-flex;align-items:center}
  .rangelab input[type=range]{min-height:24px}
}

/* Phone edge system — "16px prose / 10px surface" (Camp A, assets/workspace.css):
   the reading gutter lives on the base .wrap (unconditional — prose sat flush
   through the 640→max-width tablet band too); ≤640 cards full-bleed as native
   sheets (side borders + radius dropped, top/bottom hairlines kept). */
@media (max-width:640px){
  .card{margin-inline:-16px;border-inline:none;border-radius:0;padding-inline:12px}
  .learning-trace{font-size:9px;letter-spacing:.07em}
  .learning-trace li:not(:last-child)::after{margin-inline:5px}
  .utility-band{padding-inline:0}
}