/* ==========================================================================
   Constructive Interference — shared stylesheet
   The house brand tokens; a cooler, wave-marked room. Terracotta is the only
   interactive color. Steel Blue appears only as the second, illustrative
   wave — never as a link.
   ========================================================================== */

:root {
  /* Core palette */
  --color-ink:         #1a1a1a;
  --color-ink-light:   #4a4a4a;
  --color-ink-muted:   #7a7a7a;
  --color-ground:      #f5f2ed;
  --color-ground-warm: #ebe6dd;
  --color-white:       #faf8f4;
  --color-accent:      #c45a2d;   /* terracotta — the only interactive color */
  --color-rule:        #d0c9be;

  /* The second wave — illustrative only, never interactive */
  --color-steel:       #3a7ca5;

  /* Dark surface (terminal + inverted blocks) */
  --color-dark-bg:     #1a1a1a;
  --color-dark-text:   #c8c2b8;
  --color-dark-prose:  #b0a99e;
  --color-dark-muted:  #888888;
  --color-dark-rule:   #333333;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  --max-width: 1080px;
  --measure:   680px;
  --gutter:    clamp(1.5rem, 5vw, 4rem);

  --ease-out:  cubic-bezier(0.22, 1, 0.36, 1); /* ease-out-quint */

  /* z-index scale */
  --z-sticky: 100;
  --z-backdrop: 200;
  --z-sheet: 201;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 4.5rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-ground);
  line-height: 1.7;
  font-weight: 400;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gutter); }
.container--narrow { max-width: 760px; }

section { padding: clamp(3rem, 8vh, 6rem) 0; }

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.08;
  font-weight: 400;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1.2;
  font-weight: 400;
  text-wrap: balance;
}
h3 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
p {
  font-size: 1.05rem;
  color: var(--color-ink-light);
  max-width: var(--measure);
  text-wrap: pretty;
}

a { color: var(--color-accent); text-decoration: none; transition: color 0.2s var(--ease-out); }
a:hover { color: var(--color-ink); }

strong { font-weight: 500; color: var(--color-ink); }
em { font-style: italic; }

:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }

.rule { border: none; border-top: 1px solid var(--color-rule); margin: 0; }
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-ink); color: var(--color-ground);
  padding: 0.6rem 1rem; font-family: var(--font-mono); font-size: 0.8rem; z-index: 300;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* ---- The physics/practice couplet — the site's typographic signature ---- */
.couplet { margin: 2rem 0; max-width: var(--measure); }
.couplet dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-top: 1rem;
}
.couplet dt::before {
  content: '';
  display: inline-block;
  width: 8px; height: 8px;
  margin-right: 0.6rem;
  vertical-align: middle;
  border-radius: 50%;
}
.couplet dt.is-physics::before { background: var(--color-steel); }
.couplet dt.is-practice::before { background: var(--color-accent); }
.couplet dd {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  line-height: 1.4;
  color: var(--color-ink);
  margin-top: 0.25rem;
}

/* -------------------------------- HEADER --------------------------------- */
header {
  position: sticky; top: 0; z-index: var(--z-sticky);
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--color-rule);
  background: rgba(245, 242, 237, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
header .container { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.wordmark {
  font-family: var(--font-mono);
  font-size: 0.85rem; font-weight: 500;
  color: var(--color-ink); letter-spacing: 0.02em;
  display: inline-flex; align-items: center; gap: 0.55rem;
}
.wordmark:hover { color: var(--color-ink); }
.wordmark .mark { width: 20px; height: 12px; display: block; flex-shrink: 0; }
nav.primary { display: flex; gap: 1.6rem; }
nav.primary a {
  font-family: var(--font-mono);
  font-size: 0.76rem; font-weight: 400;
  color: var(--color-ink-muted);
  letter-spacing: 0.03em; text-transform: lowercase;
  white-space: nowrap;
}
nav.primary a:hover, nav.primary a[aria-current="page"] { color: var(--color-ink); }

/* Hamburger */
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 0.25rem; width: 28px; height: 22px; position: relative; flex-shrink: 0;
}
.nav-toggle span {
  display: block; width: 100%; height: 2px; background: var(--color-ink);
  border-radius: 1px; position: absolute; left: 0; transition: all 0.25s var(--ease-out);
}
.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle span:nth-child(3) { bottom: 0; }
.nav-toggle.active span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

/* Bottom sheet (mobile nav) */
.sheet-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(26,26,26,0.32);
  z-index: var(--z-backdrop); opacity: 0; transition: opacity 0.25s var(--ease-out);
}
.sheet-backdrop.visible { display: block; opacity: 1; }
.bottom-sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--z-sheet);
  background: var(--color-ground); border-top: 2px solid var(--color-accent);
  border-radius: 12px 12px 0 0; padding: 1.25rem 1.75rem 2.25rem;
  transform: translateY(100%); transition: transform 0.3s var(--ease-out);
  box-shadow: 0 -4px 24px rgba(26,26,26,0.14);
}
.bottom-sheet.open { transform: translateY(0); }
.sheet-handle { width: 36px; height: 4px; background: var(--color-rule); border-radius: 2px; margin: 0 auto 1.25rem; }
.bottom-sheet nav { display: flex; flex-direction: column; }
.bottom-sheet nav a {
  display: block; padding: 0.9rem 0; font-family: var(--font-mono);
  font-size: 0.9rem; color: var(--color-ink-muted);
  letter-spacing: 0.03em; text-transform: lowercase;
  border-bottom: 1px solid var(--color-rule);
}
.bottom-sheet nav a:last-child { border-bottom: none; }
.bottom-sheet nav a:hover { color: var(--color-ink); }

/* --------------------------------- HERO ---------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 10vh, 7rem) 0 clamp(3rem, 8vh, 5.5rem);
  border-bottom: 1px solid var(--color-rule);
}
.hero__field {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  display: block;
  pointer-events: none;
}
/* scrim keeps hero text on near-solid ground for AA contrast */
.hero::after {
  content: '';
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(245,242,237,0.92) 0%,
    rgba(245,242,237,0.62) 34%,
    rgba(245,242,237,0.30) 60%,
    rgba(245,242,237,0.78) 100%
  );
}
.hero .container { position: relative; z-index: 2; }
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--color-ink-muted); margin-bottom: 1.25rem;
}
.hero h1 { margin-bottom: 1.5rem; }
.hero__intro { font-size: 1.18rem; line-height: 1.7; color: var(--color-ink-light); max-width: 640px; }
.hero__note {
  margin-top: 2rem; font-family: var(--font-mono);
  font-size: 0.8rem; color: var(--color-ink-muted); letter-spacing: 0.01em;
  max-width: 640px;
}

/* Page hero (voice-dna) — quieter animated wavefield */
.pagehero { position: relative; overflow: hidden; padding: clamp(3.5rem, 9vh, 6rem) 0 clamp(2rem, 5vh, 3rem); }
.pagehero::after {
  content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg,
    rgba(245,242,237,0.92) 0%, rgba(245,242,237,0.68) 42%,
    rgba(245,242,237,0.5) 70%, rgba(245,242,237,0.85) 100%);
}
.pagehero .container { position: relative; z-index: 2; }
.pagehero h1 { margin: 1rem 0 1.75rem; }
.pagehero p + p { margin-top: 1.25rem; }
.pagehero .onpage {
  margin-top: 2.5rem; display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem;
  font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.03em;
}
.pagehero .onpage span { color: var(--color-ink-muted); }

/* ---------------------------- WAVE DIVIDER ------------------------------- */
.wave-divider {
  height: 48px;
  background: url(/img/wave-divider.svg) center / 100% 100% no-repeat;
  opacity: 0.9;
}
.wave-divider--tight { height: 34px; }

/* ------------------------- TWO WAVES (interactive) ----------------------- */
.twowaves h3 { margin-bottom: 0.75rem; }
.twowaves__grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(1.5rem, 4vw, 3rem); align-items: center; }
@media (max-width: 760px) { .twowaves__grid { grid-template-columns: 1fr; } }

.wavelab {
  margin: 0; position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-rule); border-radius: 4px;
  overflow: hidden;
}
.wavelab canvas.wavefield {
  display: block; width: 100%; height: clamp(220px, 34vw, 320px);
  cursor: grab; touch-action: none;
}
.wavelab canvas.wavefield.is-grabbing { cursor: grabbing; }
.wavelab canvas.wavefield:focus-visible { outline: 2px solid var(--color-accent); outline-offset: -2px; }
.wavelab__hint {
  position: absolute; top: 0.7rem; left: 0.85rem; pointer-events: none;
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--color-ink-muted);
}
.wavefield-readout {
  position: absolute; bottom: 0.7rem; left: 0.85rem; pointer-events: none;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  color: var(--color-ink-muted); transition: color 0.25s var(--ease-out);
}
.wavefield-readout::before {
  content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  margin-right: 0.5rem; vertical-align: middle; background: var(--color-rule);
  transition: background 0.25s var(--ease-out);
}
.wavefield-readout.is-amp { color: var(--color-accent); }
.wavefield-readout.is-amp::before { background: var(--color-accent); }
.wavefield-readout.is-cancel { color: var(--color-steel); }
.wavefield-readout.is-cancel::before { background: var(--color-steel); }
.twowaves__copy p { margin-top: 1rem; }
.twowaves__copy p:first-child { margin-top: 0; }

/* ---------------------------- INSTRUMENTS -------------------------------- */
.instruments h3 { margin-bottom: 2.25rem; }

/* Two live rooms, side by side */
.live-pair { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
@media (max-width: 760px) { .live-pair { grid-template-columns: 1fr; } }

/* Featured (a live room — links in) */
a.instrument-featured {
  display: block; color: inherit;
  background: var(--color-white);
  border: 1px solid var(--color-rule);
  border-radius: 3px;
  padding: clamp(1.75rem, 4vw, 2.75rem);
  transition: border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
a.instrument-featured:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,26,26,0.07);
}
.instrument-featured__head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.instrument-featured__name { font-family: var(--font-display); font-size: clamp(1.5rem, 3vw, 2rem); color: var(--color-ink); }
.instrument-featured p { margin-top: 0.9rem; font-size: 1rem; color: var(--color-ink-light); max-width: 62ch; }
.instrument-featured__cta {
  margin-top: 1.4rem; display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 500; color: var(--color-accent);
}
.instrument-featured__cta .arrow { transition: transform 0.2s var(--ease-out); }
a.instrument-featured:hover .instrument-featured__cta .arrow { transform: translateX(4px); }

/* Status tag */
.status {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em;
  text-transform: lowercase; color: var(--color-ink-muted);
  border: 1px solid var(--color-rule); border-radius: 2px;
  padding: 0.2rem 0.55rem; white-space: nowrap;
}
.status.is-live { color: var(--color-accent); border-color: var(--color-accent); }

/* The three context instruments — not links, honest hierarchy */
.instrument-list { margin-top: 1.25rem; }
.instrument-row {
  display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 0.5rem 1rem;
  padding: 1.5rem 0; border-bottom: 1px solid var(--color-rule);
}
.instrument-row:first-child { border-top: 1px solid var(--color-rule); }
.instrument-row__name { font-family: var(--font-display); font-size: 1.3rem; color: var(--color-ink); }
.instrument-row__name .kanji { font-size: 0.85em; color: var(--color-ink-muted); margin-left: 0.35rem; }
.instrument-row__desc { grid-column: 1 / -1; font-size: 0.95rem; color: var(--color-ink-light); max-width: 68ch; margin-top: 0.15rem; }

/* --------------------------- VOICE DNA SECTIONS -------------------------- */
.vsection h3 { margin-bottom: 0.75rem; }
.vsection__lead {
  font-family: var(--font-display); font-style: italic;
  font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.25; color: var(--color-ink);
  margin-bottom: 1.5rem; max-width: 20ch; text-wrap: balance;
}
.vsection p + p { margin-top: 1.25rem; }
.vsection--warm { background: var(--color-white); border-top: 1px solid var(--color-rule); border-bottom: 1px solid var(--color-rule); }

.cta-line {
  margin-top: 1.75rem; display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 500; color: var(--color-accent);
}
.cta-line .arrow { transition: transform 0.2s var(--ease-out); }
.cta-line:hover .arrow { transform: translateX(4px); }

/* Photograph placeholder frame (author's own B&W photographs) */
figure.photo { margin: 2.5rem 0 0; max-width: var(--measure); }
.photo__frame {
  aspect-ratio: 3 / 2;
  background: var(--color-ground-warm);
  border: 1px solid var(--color-rule); border-radius: 2px;
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.photo__frame::before {
  content: ''; position: absolute; inset: 0.7rem;
  border: 1px solid var(--color-rule); border-radius: 1px; opacity: 0.6;
}
.photo__frame span {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em;
  color: var(--color-ink-muted); position: relative;
}
.photo__img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--color-rule); border-radius: 2px;
  background: var(--color-ground-warm);
}
figure.photo figcaption {
  margin-top: 0.6rem; font-family: var(--font-mono);
  font-size: 0.72rem; color: var(--color-ink-muted); letter-spacing: 0.02em;
}

/* ------------------------------ THE DEMO --------------------------------- */
.demo-caption {
  font-size: 1rem; color: var(--color-ink-light); max-width: 64ch;
  margin-bottom: 2rem; border-left: 0; padding-left: 0;
}
.demo-caption em { font-style: italic; }

.terminal {
  background: var(--color-dark-bg);
  border: 1px solid var(--color-dark-rule);
  border-radius: 6px;
  overflow: hidden;
  margin: 1.5rem 0 2.5rem;
  box-shadow: 0 8px 24px rgba(26,26,26,0.10);
  font-family: var(--font-mono);
}
.terminal__bar {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.7rem 1rem;
  background: #202020;
  border-bottom: 1px solid var(--color-dark-rule);
}
.terminal__dots { display: inline-flex; gap: 0.4rem; }
.terminal__dots i { width: 10px; height: 10px; border-radius: 50%; background: #3a3a3a; display: block; }
.terminal__title {
  font-size: 0.72rem; letter-spacing: 0.04em; color: var(--color-dark-muted);
  margin-left: auto; text-align: right;
}
.terminal__title b { color: var(--color-dark-text); font-weight: 500; }
.terminal__body {
  padding: 1.25rem clamp(1rem, 3vw, 1.6rem) 1.6rem;
  font-size: 0.82rem; line-height: 1.65; color: var(--color-dark-text);
  overflow-x: auto;
}
.terminal__body .sys { color: var(--color-dark-muted); font-style: normal; }
.terminal__prompt { color: var(--color-accent); }           /* the “>” cue */
.terminal__draft { color: var(--color-dark-text); }
.terminal__label { color: var(--color-steel); font-weight: 500; letter-spacing: 0.02em; }
.terminal__speaker { color: #d9b48f; font-weight: 500; }    /* warm sand — the writer */
.terminal__logged { color: var(--color-dark-muted); }
.terminal__logged::before { content: '↳ '; }
.terminal .seam { color: #7fb0cf; font-style: italic; }   /* the machine's exposed guess */
.terminal__rebuilt { color: #9cbf7d; font-weight: 500; letter-spacing: 0.02em; }   /* your words, back as the draft */

.tline { display: block; }
.tline + .tline { margin-top: 0.15rem; }
.tblock { display: block; margin: 0.9rem 0; }
.tblock:first-child { margin-top: 0; }
.tindent { padding-left: 1.4rem; }

/* Audit flags */
.flag-level { color: var(--color-dark-text); font-weight: 500; letter-spacing: 0.06em; margin-top: 1.1rem; }
.flag-level .lvl1 { color: var(--color-accent); }
.flag-level .lvl2 { color: var(--color-steel); }
.flag { display: block; margin: 0.6rem 0; padding-left: 1.4rem; }
.flag .code { display: inline-block; min-width: 1.4em; color: var(--color-ground); font-weight: 600; }
.flag .code.k { color: var(--color-accent); }
.flag .code.r { color: var(--color-steel); }
.flag .code.q { color: #d9b48f; }
.flag .quote { color: var(--color-dark-text); }
.flag .diag { display: block; color: var(--color-dark-prose); padding-left: 1.4rem; }
.flag .fix { display: block; color: var(--color-dark-muted); padding-left: 1.4rem; }
.flag .fix::before { content: '→ '; color: var(--color-steel); }
.tally { display: block; margin-top: 1.1rem; color: var(--color-dark-text); }
.tally .k { color: var(--color-accent); }
.tally .r { color: var(--color-steel); }
.tally .q { color: #d9b48f; }

/* ---------------------- DEMO: tabs + controls ---------------------------- */
.demo { margin: 1.5rem 0 0.5rem; }
.demo-tabbar { display: none; }
.js .demo-tabbar {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  margin-bottom: 0.9rem;
}
.demo-tab {
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.03em;
  color: var(--color-ink-muted); background: none; cursor: pointer;
  border: 1px solid var(--color-rule); border-radius: 2px;
  padding: 0.4rem 0.85rem; transition: all 0.2s var(--ease-out);
}
.demo-tab:hover { color: var(--color-ink); border-color: var(--color-ink-muted); }
.demo-tab.is-active { color: var(--color-accent); border-color: var(--color-accent); }
.demo-actions { margin-left: auto; display: flex; gap: 0.4rem; }
.demo-btn {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  color: var(--color-accent); background: none; cursor: pointer;
  border: 1px solid var(--color-accent); border-radius: 2px;
  padding: 0.4rem 0.8rem; transition: all 0.2s var(--ease-out);
}
.demo-btn:hover { background: var(--color-accent); color: var(--color-white); }
.demo-run + .demo-run { margin-top: 1.25rem; }
.js .demo-run + .demo-run { margin-top: 0; }

/* ------------------- CLAIM CARD (evidence anatomy) ----------------------- */
figure.claim {
  margin: 2rem 0 0; max-width: 620px;
  background: var(--color-white); border: 1px solid var(--color-rule);
  border-radius: 4px; padding: clamp(1.4rem, 3vw, 2rem);
}
.claim__pattern { font-family: var(--font-display); font-size: 1.4rem; color: var(--color-ink); line-height: 1.2; }
.claim__rule { font-size: 0.98rem; color: var(--color-ink-light); margin-top: 0.6rem; max-width: none; }
.claim__quote {
  font-family: var(--font-display); font-style: italic;
  font-size: 1.1rem; line-height: 1.45; color: var(--color-ink);
  margin: 1.1rem 0; padding-left: 1rem; border-left: 2px solid var(--color-accent);
}
.claim__tag {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.02em;
}
.claim__tag span {
  color: var(--color-ink-muted); background: var(--color-ground);
  border: 1px solid var(--color-rule); border-radius: 2px; padding: 0.2rem 0.55rem;
}
.claim__gloss { margin-top: 1.25rem; display: grid; gap: 0.6rem; }
.claim__gloss > div { display: grid; grid-template-columns: 6.5rem 1fr; gap: 0.6rem; align-items: baseline; }
.claim__gloss dt { font-family: var(--font-mono); font-size: 0.72rem; color: var(--color-accent); letter-spacing: 0.02em; }
.claim__gloss dd { font-size: 0.88rem; color: var(--color-ink-light); }
figure.claim figcaption { margin-top: 1.25rem; font-family: var(--font-mono); font-size: 0.7rem; color: var(--color-ink-muted); }
@media (max-width: 520px) { .claim__gloss > div { grid-template-columns: 1fr; gap: 0.1rem; } }

/* --------------------------- TWO FACES ----------------------------------- */
.faces { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.75rem; max-width: var(--measure); }
@media (max-width: 560px) { .faces { grid-template-columns: 1fr; } }
.face {
  background: var(--color-ground-warm); border: 1px solid var(--color-rule);
  border-radius: 3px; padding: 1.25rem 1.4rem;
}
.face__label {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: lowercase; color: var(--color-accent);
  display: block; margin-bottom: 0.5rem;
}
.face p { font-size: 0.92rem; color: var(--color-ink-light); margin: 0; max-width: none; }

/* -------------------------------- FOOTER --------------------------------- */
footer { padding: 2.5rem 0; border-top: 1px solid var(--color-rule); }
footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem; }
footer p { font-family: var(--font-mono); font-size: 0.72rem; color: var(--color-ink-muted); max-width: none; }
footer a { color: var(--color-accent); }
footer a:hover { color: var(--color-ink); }

/* ------------------------------ RESPONSIVE ------------------------------- */
@media (max-width: 720px) {
  nav.primary { display: none; }
  .nav-toggle { display: block; }
  .instrument-featured__head { flex-direction: row; }
}

/* ---------------------------- MOTION (opt-in) ---------------------------- */
/* Reveals ENHANCE an already-visible default. Content is visible without JS;
   the .js gate + a hard fallback in site.js guarantee it never ships blank. */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out); }
.js .reveal.visible { opacity: 1; transform: none; }

.js .tline.step, .js .tblock.step { opacity: 0; transition: opacity 0.4s var(--ease-out); }
.js .tline.step.on, .js .tblock.step.on { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .js .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .js .tline.step, .js .tblock.step { opacity: 1 !important; transition: none !important; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}