/* ── NHID-Clinical instrument layer ──────────────────────────────────────────
   Additive only: loaded AFTER components.css on every published page. The
   home page composes with it directly; the inner pages add pages.css on top.

   The homepage is composed as alternating bands. Light paper carries the
   reading sections; three deep-ink "instrument" bands carry the hero, the
   trust-stack system map and the evidence trace console. The ink bands are
   ink in BOTH site themes — they are instrument surfaces, not a theme — so
   every colour inside them is set here explicitly rather than taken from the
   theme-swapped tokens. Teal is reserved for state and illumination; it is
   never decoration. No element glows that is not a lamp or a live state.
   ────────────────────────────────────────────────────────────────────────── */

:root {
  --inst-ink: #07111f;
  --inst-ink-2: #0b1a2e;
  --inst-ink-3: #102640;
  --inst-line: #1f3657;
  --inst-line-strong: #2d4a70;
  --inst-grid: rgba(144, 211, 255, 0.055);
  --inst-text: #b7c7d8;
  --inst-text-strong: #f2f7fc;
  --inst-text-muted: #7f95ad;
  --inst-teal: #55d9cb;
  --inst-teal-bright: #75ece0;
  --inst-teal-dim: rgba(85, 217, 203, 0.16);
  --inst-cobalt: #9cd9ff;
  --inst-amber: #ffd26c;
  --inst-red: #ffaaa4;
}

/* ── Ink bands ─────────────────────────────────────────────────────────────── */
.band-ink {
  position: relative;
  overflow: clip;
  background: var(--inst-ink);
  color: var(--inst-text);
  border-bottom: 1px solid var(--inst-line);
  padding-block: clamp(3.5rem, 7vw, 6rem);
}
[data-theme="dark"] .band-ink { background: #050c17; }

.band-ink::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 420px at 92% -8%, rgba(85, 217, 203, 0.10), transparent 62%),
    radial-gradient(700px 380px at -4% 0%, rgba(30, 99, 219, 0.10), transparent 60%),
    linear-gradient(to right, var(--inst-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--inst-grid) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 42px 42px, 42px 42px;
  -webkit-mask-image: linear-gradient(to bottom, #000 60%, rgba(0,0,0,.35));
          mask-image: linear-gradient(to bottom, #000 60%, rgba(0,0,0,.35));
}
.hero-band.band-ink::before { /* the hero's own ::before is replaced, not stacked */
  background:
    radial-gradient(1100px 520px at 88% -10%, rgba(85, 217, 203, 0.13), transparent 62%),
    radial-gradient(760px 420px at -6% 4%, rgba(30, 99, 219, 0.12), transparent 60%),
    linear-gradient(to right, var(--inst-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--inst-grid) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 42px 42px, 42px 42px;
}
.band-ink > * { position: relative; z-index: 1; }

.band-ink h1, .band-ink h2, .band-ink h3, .band-ink h4 { color: var(--inst-text-strong); }
.band-ink p, .band-ink li { color: var(--inst-text); }
.band-ink a { color: var(--inst-cobalt); }
.band-ink .section-kicker { color: var(--inst-teal-bright); }
.band-ink .meta-label { color: var(--inst-teal-bright); }
.band-ink .display-title { color: var(--inst-text-strong); }
.band-ink .lede-text { color: #c9d8e8; }
.band-ink .proof-line { color: var(--inst-text-strong); }
.band-ink .boundary-note { color: #93a9c0; }
.band-ink .boundary-note span[aria-hidden] { color: var(--inst-teal); }
.band-ink .disclaimer-small { color: var(--inst-text-muted); border-top-color: var(--inst-line); }
.band-ink .maturity-reference { color: var(--inst-text-strong); border-color: var(--inst-line-strong); }
.band-ink .action-button-secondary { background: transparent; color: #cfe2f7; border-color: var(--inst-line-strong); }
.band-ink .action-button-secondary:hover { border-color: var(--inst-teal); color: var(--inst-teal-bright); background: rgba(85, 217, 203, 0.06); }
.band-ink .cta-button-secondary { background: transparent; color: #cfe2f7; box-shadow: none; border: 1px solid var(--inst-line-strong); }

/* ── Act heads: kicker, index, title, lead ─────────────────────────────────── */
.act-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem 2rem;
  align-items: start;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}
.act-head > div { min-width: 0; }
.act-head h2 { margin: .5rem 0 .6rem; max-width: 30ch; text-wrap: balance; }
.act-head .act-lead { color: var(--body); line-height: 1.8; max-width: 64ch; margin: 0; }
.band-ink .act-head .act-lead { color: var(--inst-text); }
.act-index {
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--body);
  padding: .35rem .6rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.band-ink .act-index { color: var(--inst-text-muted); border-color: var(--inst-line); }
@media (max-width: 640px) {
  .act-head { grid-template-columns: 1fr; }
  .act-index { justify-self: start; order: -1; }
}

/* ── Hero instrument ───────────────────────────────────────────────────────── */
.hero-instrument {
  position: relative;
  min-width: 0;
}
.hero-instrument[data-figure-state="live"] > .iso { animation: instrument-in 480ms var(--motion-ease) both; }
@keyframes instrument-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* The Anatomy figure is tokenised; retune its neutral greys to the site's navy
   so the card reads as part of the instrument band rather than a pasted image. */
.hero-instrument .iso {
  --anatomy-page: var(--inst-ink);
  --anatomy-card: var(--inst-ink-2);
  --anatomy-paper: var(--inst-ink-2);
  --anatomy-face: #12284a;
  --anatomy-top: #142b4e;
  --anatomy-shade-0: #081528;
  --anatomy-shade-1: #0a1a30;
  --anatomy-shade-2: #0c1e36;
  --anatomy-shade-3: #0f2340;
  --anatomy-lit-top: #1b3d69;
  --anatomy-lit-shade: #153256;
  --anatomy-hi: #cfe2f7;
  --anatomy-mid: #5f7fa3;
  --anatomy-lo: #34506e;
  --anatomy-faint: #22344c;
  --anatomy-lit: #ffffff;
  --anatomy-halo: #030a14;
  --anatomy-halo-opacity: .85;
  --anatomy-dot: #cfe2f7;
  --anatomy-text: #96abc0;
  --anatomy-strong: #f2f7fc;
  --anatomy-muted: #5b7390;
  --anatomy-blue: var(--inst-cobalt);
  --anatomy-green: var(--inst-teal);
  --anatomy-red: var(--inst-red);
  --anatomy-mono: var(--mono);
  --anatomy-lift: inset 0 1px 0 0 rgba(255,255,255,.05), 0 0 0 1px var(--inst-line), 0 12px 32px -12px rgba(0,0,0,.6);
}
.hero-instrument .iso-figure { margin: 0; }
/* The card's own hint and long caption are redundant beside the hero copy and
   the note below the figure; the readout is the one live string, so it keeps
   the full corner width and wraps instead of colliding. */
.hero-instrument .iso-plate-corner[data-corner="hint"] { display: none; }
.hero-instrument .iso-plate-corner[data-corner="readout"] { max-width: 100%; white-space: normal; text-align: right; line-height: 1.35; }
.hero-instrument .iso-caption { display: none; }
/* The figure's scenario chips sit in a half-width column here, so two per row
   keeps every scenario name and reason code whole instead of ellipsised. */
.hero-instrument .tg-chips { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.hero-instrument .tg-chip code { white-space: nowrap; }
.hero-figure-note {
  margin: .75rem 0 0;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--inst-text-muted);
}
.hero-figure-note code { font-family: var(--mono); color: #cfe2f7; font-size: .78rem; }

/* Fallback figure (served first; replaced when the instrument loads) on ink */
.band-ink .figure-frame { background: var(--inst-ink-2); border-color: var(--inst-line); }
.band-ink .ob-zone { fill: var(--inst-text-muted); }
.band-ink .ob-row[data-kind="control"] rect { fill: #103c3b; stroke: var(--inst-teal); }
.band-ink .ob-row[data-kind="adjacent"] rect { stroke: var(--inst-line-strong); }
.band-ink .ob-name { fill: var(--inst-text-strong); }
.band-ink .ob-flow { stroke: var(--inst-line-strong); }
.band-ink .ob-flow-head { fill: var(--inst-line-strong); }
.band-ink .ob-control[data-kind="control"] { fill: var(--inst-teal-bright); }
.band-ink .ob-control[data-kind="adjacent"] { fill: var(--inst-text-muted); }
.band-ink .diagram-layers-alt li { color: var(--inst-text); border-color: var(--inst-line); background: transparent; }

/* Hero: the observe-only line and its inline link on ink */
.hero-observe { margin-top: 1rem; font-size: 1rem; color: #b7c7d8; max-width: 58ch; line-height: 1.65; }
.hero-observe a { color: var(--inst-teal-bright); font-weight: 600; white-space: nowrap; }

/* ── Trust-stack system map ────────────────────────────────────────────────── */
.stack-map-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}
@media (max-width: 1000px) { .stack-map-wrap { grid-template-columns: 1fr; } }

.stack-map {
  margin: 0;
  padding: 1.25rem 1.1rem 1rem;
  border: 1px solid var(--inst-line);
  border-radius: 12px;
  background: var(--inst-ink-2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 18px 40px -24px rgba(0,0,0,.7);
  min-width: 0;
  overflow-x: auto;
}
.stack-map svg { width: 100%; height: auto; display: block; min-width: 640px; }
/* Below the map's natural width it scrolls inside its frame. Say so: a fade
   on the trailing edge and a one-word cue, rather than a silently cut figure. */
@media (max-width: 760px) {
  .stack-map { position: relative; padding-top: 2.1rem; }
  .stack-map::before {
    content: "scroll \2192"; position: absolute; top: .7rem; right: .9rem; z-index: 2;
    font-family: var(--mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase;
    color: var(--inst-teal-bright);
  }
  .stack-map::after {
    content: ""; position: absolute; top: 0; right: 0; bottom: 0; width: 3rem; pointer-events: none; z-index: 1;
    background: linear-gradient(to right, rgba(11, 26, 46, 0), var(--inst-ink-2));
    border-radius: 0 12px 12px 0;
  }
}

.sm-zone { font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; fill: var(--inst-text-muted); }
.sm-spine { stroke: var(--inst-line-strong); stroke-width: 1.4; fill: none; }
.sm-spine-head { fill: var(--inst-line-strong); }
.sm-tick { stroke: var(--inst-line-strong); stroke-width: 1.2; fill: none; }
.sm-num { font-family: var(--mono); font-size: 12px; font-weight: 500; fill: var(--inst-text-muted); }
.sm-row rect.sm-slab { stroke-width: 1.2; }
.sm-row[data-kind="external"] rect.sm-slab { fill: #0e2038; stroke: var(--inst-line-strong); }
.sm-row[data-kind="extension"] rect.sm-slab { fill: #0f2a52; stroke: #4f7fc4; }
.sm-row[data-kind="core"] rect.sm-slab { fill: #0d3a3c; stroke: var(--inst-teal); stroke-width: 2; }
.sm-row[data-kind="gap"] rect.sm-slab { fill: none; stroke: var(--inst-line-strong); stroke-dasharray: 6 4; }
.sm-name { font-family: var(--sans); font-size: 12.5px; font-weight: 650; fill: var(--inst-text-strong); }
.sm-purpose { font-family: var(--sans); font-size: 10.5px; fill: var(--inst-text); }
.sm-std { font-family: var(--mono); font-size: 10px; fill: #cfe2f7; }
.sm-chip rect { fill: transparent; stroke-width: 1; }
.sm-chip text { font-family: var(--mono); font-size: 8.25px; letter-spacing: .08em; text-transform: uppercase; }
.sm-chip[data-kind="external"] rect { stroke: var(--inst-line-strong); }
.sm-chip[data-kind="external"] text { fill: var(--inst-text-muted); }
.sm-chip[data-kind="extension"] rect { stroke: #4f7fc4; }
.sm-chip[data-kind="extension"] text { fill: #9cd9ff; }
.sm-chip[data-kind="core"] rect { stroke: var(--inst-teal); fill: rgba(85,217,203,.10); }
.sm-chip[data-kind="core"] text { fill: var(--inst-teal-bright); }
.sm-chip[data-kind="gap"] rect { stroke: var(--inst-amber); }
.sm-chip[data-kind="gap"] text { fill: var(--inst-amber); }
.sm-flow { stroke: var(--inst-line-strong); stroke-width: 1.4; fill: none; }
.sm-flow-head { fill: var(--inst-line-strong); }
.sm-evidence { font-family: var(--mono); font-size: 10.5px; fill: #cfe2f7; }
.sm-gapname { font-family: var(--sans); font-size: 11px; font-style: italic; fill: var(--inst-text); }
.sm-key { font-family: var(--sans); font-size: 10px; fill: var(--inst-text-muted); }
.sm-key-core { fill: var(--inst-teal); }
.sm-key-ext { fill: #4f7fc4; }
.sm-key-std { fill: var(--inst-line-strong); }
.sm-lamp { fill: var(--inst-line-strong); }
.sm-row.active .sm-lamp { fill: var(--inst-teal-bright); filter: drop-shadow(0 0 3px rgba(117, 236, 224, .8)); }

/* Rows are the tabs: pointer, hover lift, keyboard focus. */
.sm-row[role="tab"] { cursor: pointer; }
.sm-row[role="tab"]:hover rect.sm-slab { filter: brightness(1.18); }
.sm-row.active rect.sm-slab { stroke: var(--inst-teal-bright); stroke-width: 2; }
.sm-row[role="tab"]:focus { outline: none; }
.sm-row[role="tab"]:focus-visible rect.sm-slab { stroke: #ffffff; stroke-width: 2; }
@media (prefers-reduced-motion: no-preference) {
  .sm-row rect.sm-slab { transition: filter 160ms var(--motion-ease), stroke 160ms var(--motion-ease); }
}

.stack-tabs { display: flex; flex-direction: column; gap: .5rem; margin: 0 0 1rem; }
.band-ink .stack-tabs .btn-ghost {
  justify-content: flex-start;
  color: #cfe2f7;
  background: rgba(16, 38, 64, .55);
  border: 1px solid var(--inst-line);
  font-family: var(--mono);
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .01em;
}
.band-ink .stack-tabs .btn-ghost:hover { background: rgba(16, 38, 64, .95); border-color: var(--inst-line-strong); }
.band-ink .stack-tabs .btn-ghost.active { border-color: var(--inst-teal); color: var(--inst-teal-bright); background: rgba(85, 217, 203, .07); filter: none; }
.band-ink .stack-layer:hover, .band-ink .stack-layer.active { filter: none; }
.band-ink .stack-detail { background: var(--inst-ink-2); border: 1px solid var(--inst-line); }
.band-ink .stack-detail h3 { color: var(--inst-teal-bright); }
.band-ink .stack-detail .layer-tag { color: var(--inst-text-muted); }
.band-ink .stack-detail p { color: var(--inst-text); }
.band-ink .stack-detail .stack-links a { color: var(--inst-cobalt); }

/* Standards strip beneath the map */
.standards-strip {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .6rem;
  align-items: center;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--inst-line);
}
.standards-strip-label { font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--inst-text-muted); margin-right: .5rem; }
.standards-strip b {
  display: inline-flex; flex-direction: column; gap: .05rem;
  padding: .45rem .7rem; border: 1px solid var(--inst-line); border-radius: 6px;
  background: rgba(11, 26, 46, .7); color: var(--inst-text-strong); font-weight: 600; font-size: .8125rem;
}
.standards-strip b small { font-weight: 400; font-size: .72rem; color: var(--inst-text-muted); }

/* ── Control register (light) ──────────────────────────────────────────────── */
.control-register .control-table { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--paper); }
.control-register .control-table thead th { background: var(--mist); padding: .7rem .9rem; opacity: .8; }
.control-register .control-table-id {
  font-family: var(--mono); font-size: .8125rem; padding: .15rem .45rem;
  border: 1px solid var(--line); border-radius: 4px; background: var(--mist); color: var(--ink);
}
.control-register .control-table-action {
  font-family: var(--mono); display: inline-block; padding: .15rem .45rem; border-radius: 4px;
  border: 1px solid var(--teal); color: var(--teal); font-weight: 500;
  white-space: nowrap; overflow-wrap: normal;
}
.control-register .control-table-code { font-family: var(--mono); color: var(--ink-soft); }
@media (max-width: 900px) {
  .control-register .control-table { border: 0; border-radius: 0; background: transparent; }
}

/* ── Evidence trace console (ink) ──────────────────────────────────────────── */
.trace {
  border: 1px solid var(--inst-line);
  border-radius: 12px;
  background: var(--inst-ink-2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 18px 40px -24px rgba(0,0,0,.7);
  overflow: hidden;
}
.trace-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.1rem;
  padding: .65rem 1rem; border-bottom: 1px solid var(--inst-line);
  font-family: var(--mono); font-size: .75rem; color: var(--inst-text-muted);
}
.trace-bar code { color: #cfe2f7; }
.trace-bar .trace-live { display: inline-flex; align-items: center; gap: .4rem; color: var(--inst-teal-bright); }
.trace-bar .trace-live::before { content: ""; width: .5rem; height: .5rem; border-radius: 999px; background: var(--inst-teal-bright); box-shadow: 0 0 6px rgba(117,236,224,.8); }
.trace-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.trace-pane { min-width: 0; padding: 1rem 1.05rem 1.15rem; border-left: 1px solid var(--inst-line); position: relative; }
.trace-pane:first-child { border-left: 0; }
.trace-head {
  display: flex; align-items: baseline; gap: .55rem; margin: 0 0 .75rem;
  font-family: var(--mono); font-size: .6875rem; letter-spacing: .1em; text-transform: uppercase; color: var(--inst-text-muted);
}
.trace-head b { color: var(--inst-teal-bright); font-weight: 600; }
.trace-head code { text-transform: none; letter-spacing: 0; color: #cfe2f7; }
.trace-code {
  margin: 0; font-family: var(--mono); font-size: .78rem; line-height: 1.7; color: #cfe2f7;
  white-space: pre; overflow-x: auto; tab-size: 2;
}
.trace-code code { font-family: inherit; white-space: pre; }
.tk-key { color: #8fb3d9; }
.tk-str { color: #a7e3d1; }
.tk-num { color: var(--inst-amber); }
.tk-null { color: #7f93a8; font-style: italic; }
.tk-act { color: var(--inst-teal-bright); font-weight: 600; }
.tk-crit { color: var(--inst-red); }
.tk-code { color: #dbe9ff; }
.tk-dim { color: var(--inst-text-muted); }

/* Controls pane: a connected event timeline with state dots */
.trace-steps { list-style: none; margin: 0; padding: 0; position: relative; }
.trace-steps::before { content: ""; position: absolute; left: .42rem; top: .55rem; bottom: .55rem; width: 1px; background: var(--inst-line-strong); }
.trace-step { display: grid; grid-template-columns: 1rem minmax(0, 1fr); gap: .55rem; align-items: start; padding: .36rem 0; position: relative; }
.st-dot { width: .85rem; height: .85rem; border-radius: 999px; margin-top: .22rem; border: 1.5px solid var(--inst-teal); background: var(--inst-ink-2); box-sizing: border-box; }
.trace-step[data-state="critical"] .st-dot { background: var(--inst-red); border-color: var(--inst-red); box-shadow: 0 0 0 3px rgba(255,170,164,.18); }
.st-id { font-family: var(--mono); font-size: .8rem; color: var(--inst-text-strong); font-weight: 500; }
.st-sev { font-family: var(--mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; margin-left: .45rem; color: var(--inst-text-muted); }
.trace-step[data-state="critical"] .st-sev { color: var(--inst-red); }
.st-reason { display: block; font-family: var(--mono); font-size: .72rem; color: #a9bdd3; overflow-wrap: anywhere; }
.st-action { display: block; font-family: var(--mono); font-size: .72rem; color: var(--inst-text-muted); }
.trace-step[data-state="critical"] .st-action { color: var(--inst-teal-bright); }

/* Decision pane: the composite, large */
.trace-decision { display: grid; gap: .45rem; }
.trace-decision dt { font-family: var(--mono); font-size: .66rem; letter-spacing: .1em; text-transform: uppercase; color: var(--inst-text-muted); margin: 0; }
.trace-decision dd { margin: 0 0 .35rem; font-family: var(--mono); font-size: .9rem; color: #cfe2f7; overflow-wrap: anywhere; }
.trace-decision dd.is-action { font-size: 1.35rem; font-weight: 600; color: var(--inst-teal-bright); letter-spacing: .01em; }
.trace-rule { margin: .8rem 0 0; font-size: .8125rem; line-height: 1.6; color: var(--inst-text-muted); }

/* Pane order markers and connectors between panes */
.trace-pane::before {
  content: ""; position: absolute; top: 50%; left: -7px; width: 12px; height: 12px;
  background: var(--inst-ink-2); border-right: 1px solid var(--inst-line-strong); border-top: 1px solid var(--inst-line-strong);
  transform: translateY(-50%) rotate(45deg);
}
.trace-pane:first-child::before { display: none; }

.trace-foot { padding: .8rem 1rem; border-top: 1px solid var(--inst-line); font-size: .875rem; line-height: 1.65; color: var(--inst-text); }
.trace-foot code { font-family: var(--mono); font-size: .8rem; color: #cfe2f7; }

@media (max-width: 1100px) {
  .trace-grid { grid-template-columns: 1fr 1fr; }
  .trace-pane:nth-child(3) { border-left: 0; }
  .trace-pane:nth-child(n+3) { border-top: 1px solid var(--inst-line); }
  .trace-pane:nth-child(3)::before { display: none; }
}
@media (max-width: 680px) {
  .trace-grid { grid-template-columns: 1fr; }
  .trace-pane { border-left: 0; border-top: 1px solid var(--inst-line); }
  .trace-pane:first-child { border-top: 0; }
  .trace-pane::before { display: none; }
}

/* ── Proof strip ───────────────────────────────────────────────────────────── */
.proof-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
  gap: 1px;
  margin-top: 2rem;
  background: var(--inst-line);
  border: 1px solid var(--inst-line);
  border-radius: 10px;
  overflow: hidden;
}
.proof-cell { background: var(--inst-ink-2); padding: 1.05rem 1.15rem 1.1rem; min-width: 0; }
.proof-value { display: block; font-family: var(--mono); font-size: 1.65rem; line-height: 1.1; color: var(--inst-text-strong); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.proof-label { display: block; margin-top: .35rem; font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--inst-teal-bright); }
.proof-note { display: block; margin-top: .4rem; font-size: .8125rem; line-height: 1.5; color: var(--inst-text-muted); }
.proof-note a { color: var(--inst-cobalt); }
.proof-caption { margin: .8rem 0 0; font-size: .8125rem; color: var(--inst-text-muted); }

/* ── Simulator record (light) ──────────────────────────────────────────────── */
.record-note { margin: 1rem 0 0; font-size: .85rem; color: var(--body); }

/* ── What it is / is not: a two-column ledger (light) ──────────────────────── */
.ledger { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--paper); }
.ledger > div { padding: 1.5rem 1.65rem; min-width: 0; }
.ledger > div + div { border-left: 1px solid var(--line); background: var(--mist); }
.ledger h2 { font-size: 1.1rem; margin: 0 0 1rem; display: flex; align-items: center; gap: .6rem; }
.ledger h2 .ledger-mark { font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; padding: .18rem .45rem; border-radius: 4px; border: 1px solid currentColor; }
.ledger ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .8rem; }
.ledger li { display: flex; gap: .75rem; align-items: baseline; color: var(--body); font-size: .95rem; line-height: 1.7; }
.ledger li > span:first-child { flex-shrink: 0; font-weight: 800; }
.ledger-is li > span:first-child { color: var(--teal); }
.ledger-not li > span:first-child { color: var(--ink-soft); }
@media (max-width: 760px) {
  .ledger { grid-template-columns: 1fr; }
  .ledger > div + div { border-left: 0; border-top: 1px solid var(--line); }
}

/* ── Light bands: alternate surfaces so the page reads as acts, not a scroll ── */
.band-mist { background: var(--mist); }
.band-paper { background: var(--paper); }

/* ── Reduced motion ────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .hero-instrument[data-figure-state="live"] > .iso { animation: none; }
  .sm-row rect.sm-slab { transition: none; }
}

/* ── How it works: the three explainer films (light) ──────────────────────
   One film is shown at a time behind a tab row. Without JavaScript the tab
   row is hidden and all three films stack, so nothing depends on the script. */
.film-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0 0 1rem; }
.film-tab {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase;
  padding: .55rem .95rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--paper); color: var(--body); cursor: pointer; line-height: 1;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.film-tab:hover { border-color: var(--teal); color: var(--teal); }
.film-tab.is-active { border-color: var(--teal); color: var(--teal); background: rgba(20, 184, 166, .09); }
.film-tab:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
html:not(.js) .film-tabs { display: none; }
html:not(.js) .film[hidden] { display: block; }
.film-stage { display: grid; gap: 1.25rem; }
.film {
  margin: 0; min-width: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  background: var(--mist); box-shadow: 0 28px 56px -40px rgba(8, 42, 91, .4);
}
.film-video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; background: #eef0f3; }
.film figcaption { padding: .9rem 1.15rem; font-size: .875rem; line-height: 1.65; color: var(--body); border-top: 1px solid var(--line); background: var(--paper); }
.film figcaption strong { color: var(--ink); }
.film-rules {
  list-style: none; padding: 0; margin: 1.5rem 0 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(11.5rem, 1fr)); gap: .6rem;
}
.film-rules li { display: flex; flex-direction: column; gap: .3rem; min-width: 0; padding: .8rem .9rem; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); font-size: .9rem; line-height: 1.4; }
.film-rules li > span { font-weight: 700; color: var(--ink); }
.film-rules code { font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; color: var(--teal); white-space: normal; }