/* ==========================================================================
   MUSEUM LAYER — visual identity of the digital museum (loaded last).
   Gallery-night atmosphere, archival typography, exhibit lighting, cinematic
   home, scroll-driven chronicle, biography lifeline, dossier, presenter stage.
   All motion is subtle, explanatory, and removed under reduced motion.
   ========================================================================== */

/* Registered so that era changes (corridor, chronicle) cross-fade smoothly instead of snapping. */
@property --era { syntax: '<color>'; inherits: true; initial-value: #a8642e; }

/* ---------- Atmosphere ---------- */
body {
  background-color: var(--c-bg);
  background-image: none; background-attachment: scroll; /* room light lives on a fixed layer: a fixed background repaints on every scroll */
  font-feature-settings: 'kern', 'liga';
}
body::before {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    radial-gradient(1400px 700px at 50% -220px, var(--light-warm), transparent 70%),
    radial-gradient(900px 600px at 105% 30%, var(--light-cool), transparent 70%),
    radial-gradient(1000px 800px at -10% 90%, rgba(150, 100, 50, .05), transparent 70%);
}
.anim-paused, .anim-paused * { animation-play-state: paused !important; }
body::after { /* film grain — a single tiny SVG tile, no animation */
  content: ''; position: fixed; inset: 0; z-index: 1000; pointer-events: none; opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .5 0 0 0 0 .45 0 0 0 0 .38 0 0 0 1.4 -.2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection { background: color-mix(in srgb, var(--c-gold) 38%, transparent); color: var(--c-ink); }
html { scrollbar-color: var(--c-line) var(--c-bg); }

/* ---------- Typography ---------- */
h1, h2, h3 { font-weight: 600; letter-spacing: -.005em; text-wrap: balance; }
h1 { font-weight: 500; letter-spacing: -.012em; }
.page-title { font-size: var(--fs-3xl); line-height: 1.04; font-weight: 500; }
.page-lede { font-size: clamp(1.08rem, 1rem + .35vw, 1.28rem); line-height: 1.62; text-wrap: pretty; }
.prose { font-variant-numeric: oldstyle-nums proportional-nums; text-wrap: pretty; }
.prose h2, .section-head h2 { font-weight: 500; }
.eyebrow { font-size: .7rem; letter-spacing: .22em; font-weight: 600; color: var(--c-gold); }
.eyebrow .sep { color: color-mix(in srgb, var(--c-gold) 45%, transparent); font-size: .6em; }
.section-head { border-bottom: 0; position: relative; padding-bottom: .9rem; }
.section-head::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: linear-gradient(90deg, var(--c-gold), color-mix(in srgb, var(--c-gold) 25%, transparent) 30%, var(--c-line-soft)); opacity: .7; }
.section-head h2 { font-size: var(--fs-2xl); }
.section-head > a { font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; text-decoration: none; color: var(--c-muted); }
.section-head > a:hover { color: var(--c-gold); }
.lead-dropcap > p:first-of-type::first-letter { color: var(--c-gold); font-weight: 500; font-size: 4.6em; text-shadow: 0 0 28px color-mix(in srgb, var(--c-gold) 35%, transparent); }
.prose blockquote { border-left: 1px solid var(--c-gold); font-family: var(--font-display); font-size: 1.25em; line-height: 1.45; }
a { text-decoration-color: color-mix(in srgb, currentColor 40%, transparent); }
a:hover { text-decoration-color: currentColor; }
.date-stamp { background: transparent; color: var(--c-gold); border: 1px solid color-mix(in srgb, var(--c-gold) 50%, transparent); }
pre { background: #060504; border: 1px solid var(--c-line-soft); color: #e9dfc8; }
:root[data-theme="light"] pre { background: var(--c-midnight); }

/* ---------- Header ---------- */
.site-header {
  background: color-mix(in srgb, var(--c-midnight) 78%, transparent);
  backdrop-filter: saturate(1.3) blur(14px); -webkit-backdrop-filter: saturate(1.3) blur(14px);
  border-bottom: 0; transition: background .5s var(--ease), box-shadow .5s var(--ease);
}
.site-header::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); opacity: .8; }
.brand-title { font-weight: 500; font-size: 1.38rem; letter-spacing: .015em; }
.brand-sub { letter-spacing: .2em; font-size: .62rem; }
.nav a, .nav-more > button { position: relative; letter-spacing: .02em; border-radius: 0; background: none !important; }
.nav a::after { content: ''; position: absolute; left: .6rem; right: .6rem; bottom: .2rem; height: 1px; background: #e7c77f; transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease); }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: #f3d79b; }
.tool-btn { border-color: rgba(239, 229, 207, .16); border-radius: 999px; }
.tool-btn:hover { border-color: rgba(231, 199, 127, .6); background: rgba(231, 199, 127, .08); }
.nav-menu { background: #100e0b; border-color: rgba(216, 182, 110, .25); }
body.is-home:not(.scrolled) .site-header { background: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; }
body.is-home:not(.scrolled) .site-header::after { opacity: 0; }
.site-header.is-compact .nav { background: #0b0a08; }
.site-header.is-compact .nav a::after { display: none; }
body.nav-open { overflow: hidden; }
@media (max-width: 1500px) { .site-header:not(.is-compact) .brand-sub { display: none; } }

/* ---------- Footer ---------- */
.site-footer { position: relative; background: linear-gradient(180deg, #0a0907, #050403); border-top: 0; padding-top: var(--sp-8); }
.site-footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: var(--hairline-gold); }
.site-footer .brand-title { font-size: 1.8rem; }
.footer-grid h4, .footer-h { font-family: var(--font-sans); font-size: .76rem; text-transform: uppercase; color: #e7c77f; font-weight: 600; letter-spacing: .2em; margin: 0 0 .8rem; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: #f3d79b; text-decoration: underline; }

/* ---------- Buttons & chips ---------- */
.btn { border-radius: 999px; letter-spacing: .02em; font-weight: 600; background: var(--c-surface); border-color: var(--c-line); transition: background .25s, border-color .25s, color .25s, box-shadow .25s, transform .15s; }
.btn:hover { border-color: var(--c-gold); background: var(--c-surface-2); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c-gold) 10%, transparent); }
.btn-primary { background: linear-gradient(180deg, #e3a56c, #c9864a); border-color: #d99a5e; color: #1a1206; box-shadow: 0 6px 24px rgba(201, 134, 74, .25); }
.btn-primary:hover { background: linear-gradient(180deg, #efb780, #d6935a); color: #1a1206; border-color: #efb780; }
:root[data-theme="light"] .btn-primary { background: var(--c-accent); color: var(--c-accent-ink); border-color: var(--c-accent); box-shadow: none; }
.chip { background: transparent; border-color: var(--c-line); }
.chip[aria-pressed="true"] { background: var(--c-gold); color: #1a1206; border-color: var(--c-gold); }
.badge { border-radius: 2px; letter-spacing: .12em; }

/* ---------- Exhibit surfaces (cards, panels, figures) ---------- */
.card, .panel, .filters, .tl-drawer, .empty-state, .pager a, .next-story {
  background-color: var(--c-surface); background-image: var(--vitrine); border-color: var(--c-line-soft); border-radius: var(--radius);
}
.card { overflow: hidden; isolation: isolate; }
.card::before, .wing::before, .plaque::before, .chapter::before, .ledger-item::before, .pioneer::before, .era-row::before {
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: 0; transition: opacity .4s var(--ease);
  background: radial-gradient(380px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--c-gold) 13%, transparent), transparent 65%);
}
.card:hover::before, .wing:hover::before, .plaque:hover::before, .chapter:hover::before, .ledger-item:hover::before, .pioneer:hover::before, .era-row:hover::before { opacity: 1; }
a.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); box-shadow: var(--shadow-2); }
.card h3 { font-weight: 600; font-size: 1.36rem; }
.card-label { color: var(--c-gold); letter-spacing: .18em; font-size: .66rem; }
.event-card { border-left: 1px solid var(--c-line-soft); }
.event-card::after { content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 2px; background: var(--era, var(--c-accent)); border-radius: 2px; box-shadow: 0 0 12px var(--era, var(--c-accent)); }
.event-card.imp-3::after { content: ''; }
.case-card { background-color: color-mix(in srgb, var(--c-gold-soft) 70%, var(--c-surface)); }
.invention-card { background-color: var(--c-surface); }
.lec-num { color: color-mix(in srgb, var(--c-gold) 16%, transparent); }
.figure { background: var(--c-surface); border: 1px solid var(--c-line-soft); border-radius: var(--radius); box-shadow: var(--shadow-1); }
.figure-media { background: var(--dg-bg); box-shadow: inset 0 0 0 10px var(--c-surface), inset 0 0 0 11px var(--c-line-soft); padding: 14px; }
.figure-media img { border: 1px solid var(--c-line-soft); }
.figure figcaption { font-family: var(--font-serif); font-size: .9rem; border-top: 0; padding: .2rem 1.2rem 1rem; }
.fig-label { color: var(--c-gold); letter-spacing: .2em; }
.fig-tools button { border-radius: 999px; background: color-mix(in srgb, var(--c-surface) 80%, transparent); border-color: var(--c-line); }
.portrait { border: 1px solid color-mix(in srgb, var(--c-gold) 55%, transparent); box-shadow: 0 0 0 4px var(--c-surface), 0 0 0 5px color-mix(in srgb, var(--c-gold) 35%, transparent), var(--shadow-2); }
.portrait img { filter: sepia(.22) contrast(1.04) brightness(.96); }
.callout { background: var(--c-surface); border-color: var(--c-line-soft); border-left-width: 2px; }
.input, select.input { background: var(--c-bg); border-color: var(--c-line); border-radius: var(--radius); }
.tabs button[aria-selected="true"] { border-bottom-color: var(--c-gold); }
.search-dialog { background: var(--c-surface); border-color: color-mix(in srgb, var(--c-gold) 35%, var(--c-line)); border-radius: var(--radius-lg); }
.search-dialog::backdrop { background: rgba(4, 3, 2, .72); backdrop-filter: blur(6px); }
.sr-type { color: var(--c-gold); }
.lightbox { background: var(--c-surface); }
.sources-block { border-top: 1px solid var(--c-gold); }
.sources-block h2 { font-size: .8rem; letter-spacing: .24em; color: var(--c-gold); font-weight: 600; }
.loading-screen .spinner { border-color: var(--c-line); border-top-color: var(--c-gold); }

/* Era colours are mid-tones; lift them toward the ink colour wherever they are used as text. */
.era-num, .era-num-sm, .tl-group-h .era-num-sm { color: color-mix(in srgb, var(--era, var(--c-accent)) 55%, var(--c-ink)); }
:root[data-theme="light"] .era-num, :root[data-theme="light"] .era-num-sm { color: var(--era, var(--c-accent)); }

/* ---------- Reveal on scroll ---------- */
.js-reveal .rv { transition: opacity .9s var(--ease-slow), transform .9s var(--ease-slow); }
.js-reveal .rv:not(.is-in) { opacity: 0; transform: translateY(22px); }

/* ---------- Era glyphs ---------- */
.era-glyph { display: block; overflow: visible; }
.mg { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.mg .mg-t { stroke-width: .9; opacity: .6; }
.mg .mg-a { stroke: var(--glyph-accent, var(--c-gold)); }
.mg .mg-f { fill: var(--glyph-accent, var(--c-gold)); stroke: none; }
.mg .mg-f2 { fill: color-mix(in srgb, var(--glyph-accent, var(--c-gold)) 30%, transparent); }
.mg .mg-node { fill: var(--c-bg); }
.mg .mg-txt { font: 600 11px var(--font-mono); fill: currentColor; stroke: none; }
.mg .mg-glow { stroke: #f2b56c; stroke-width: 2.4; filter: drop-shadow(0 0 4px #f2b56c); animation: mg-glow 2.6s ease-in-out infinite; }
.mg .mg-spin { animation: mg-spin 16s linear infinite; }
.mg .mg-spin.mg-rev { animation-direction: reverse; animation-duration: 9.8s; }
.mg .mg-spin.mg-slow { animation-duration: 24s; }
.mg .mg-blink { animation: mg-blink 1.6s steps(1) infinite; }
.mg .mg-pulse { animation: mg-pulse 2.8s ease-in-out infinite; animation-delay: calc(var(--d, 0) * .35s); }
.mg .mg-flow { stroke-dasharray: 4 6; animation: mg-flow 2.2s linear infinite; }
@keyframes mg-spin { to { transform: rotate(360deg); } }
@keyframes mg-glow { 50% { opacity: .45; } }
@keyframes mg-blink { 50% { opacity: .25; } }
@keyframes mg-pulse { 50% { opacity: .35; } }
@keyframes mg-flow { to { stroke-dashoffset: -20; } }

/* ==========================================================================
   HOME — overture, corridor, ledger, plaques, wings, pioneers
   ========================================================================== */
.overture {
  position: relative; isolation: isolate; overflow: hidden; color: var(--c-on-midnight);
  min-height: min(100svh, 980px); margin-top: calc(-1 * var(--header-h)); padding: calc(var(--header-h) + clamp(2.5rem, 9vh, 7rem)) 0 6.5rem;
  display: flex; flex-direction: column; justify-content: center;
  background: radial-gradient(120% 80% at 50% 0%, #1d160d 0%, #0b0907 55%, #050403 100%);
}
.overture::before { /* faint archival grid receding into darkness */
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(rgba(231, 199, 127, .045) 1px, transparent 1px), linear-gradient(90deg, rgba(231, 199, 127, .045) 1px, transparent 1px);
  background-size: 56px 56px; mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 85%); -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 85%);
}
.ov-light { /* a slow-breathing spotlight from above */
  position: absolute; z-index: -1; left: 50%; top: -30%; width: min(1400px, 140vw); aspect-ratio: 1.6; transform: translateX(-50%); pointer-events: none;
  background: radial-gradient(closest-side, rgba(236, 184, 112, .22), rgba(236, 184, 112, .06) 55%, transparent);
  animation: ov-breathe 9s ease-in-out infinite;
}
@keyframes ov-breathe { 50% { opacity: .7; transform: translateX(-50%) scale(1.04); } }
.overture-inner { text-align: center; display: flex; flex-direction: column; align-items: center; }
.overture .hero-eyebrow { color: #e7c77f; justify-content: center; letter-spacing: .3em; }
.overture .hero-title { font-size: var(--fs-hero); font-weight: 500; line-height: .95; letter-spacing: -.02em; margin: .25em 0 .2em; color: #f7eedb; text-shadow: 0 0 60px rgba(236, 184, 112, .18); }
.ht-line { display: inline-block; }
.ht-em { font-style: italic; color: #e7c77f; }
.overture .hero-sub { font-family: var(--font-display); font-style: italic; font-size: clamp(1.25rem, 1rem + 1.2vw, 2rem); color: #d9c49a; margin: 0 0 1.3rem; }
.overture .hero-lede { font-family: var(--font-serif); font-size: clamp(1rem, .95rem + .3vw, 1.18rem); line-height: 1.75; max-width: 62ch; color: #b9ae96; margin: 0 auto; }
.overture .hero-cta { justify-content: center; margin: 2.2rem 0 0; }
.overture .btn-hero { background: rgba(255, 240, 210, .03); color: #efe5cf; border-color: rgba(239, 229, 207, .25); }
.overture .btn-hero:hover { border-color: #e7c77f; color: #fff; background: rgba(231, 199, 127, .08); }
.overture-art { margin-top: clamp(2rem, 6vh, 4rem); }
.overture .hero-art { max-width: 1100px; margin: 0 auto; }
.ha-thread { stroke: rgba(231, 199, 127, .5); }
.ha-spark { fill: #ffd79a; filter: drop-shadow(0 0 6px #ffcf86); }
.ha-halo { opacity: .9; }
.ha-item .ha-g { fill: rgba(11, 9, 7, .9); stroke: #efe5cf; }
.ha-lbl { fill: #a99f88; font-size: 10.5px; letter-spacing: .2em; }
.ha-item:hover .ha-g { stroke: #ffd79a; }
.ov-cue { position: absolute; left: 50%; bottom: 1.6rem; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: .6rem; background: none; border: 0; color: #b9ae96; cursor: pointer; font: 600 .66rem var(--font-sans); letter-spacing: .3em; text-transform: uppercase; padding: .5rem 1rem; }
.ov-cue:hover { color: #e7c77f; }
.ov-cue-line { width: 1px; height: 42px; background: linear-gradient(#e7c77f, transparent); animation: ov-cue 2.4s var(--ease) infinite; transform-origin: top; }
@keyframes ov-cue { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); opacity: 1; } 100% { transform: scaleY(1); opacity: 0; } }
:root[data-theme="light"] .overture { background: radial-gradient(120% 80% at 50% 0%, #2a2014 0%, #120e09 60%, #0a0806 100%); }

/* Corridor: sticky exhibit stage + scrolling chapters */
.corridor { position: relative; isolation: isolate; padding: var(--sp-9) 0 var(--sp-8); transition: --era 1.2s var(--ease); }
/* Era washes: fixed layers clipped to their section (clip-path also clips fixed descendants), so they stay put while scrolling without repainting. */
.corridor, .chronicle-sec { clip-path: inset(0 -100vw); } /* clipped vertically only: the era rail sits outside the column */
.corridor-wash { position: fixed; inset: 0; z-index: -1; pointer-events: none; transition: background 1.2s var(--ease);
  background-image: radial-gradient(60% 50% at 25% 40%, color-mix(in srgb, var(--era) 16%, transparent), transparent 70%); }
.corridor-head { text-align: center; max-width: 900px; margin-bottom: var(--sp-7); }
.corridor-head .eyebrow { justify-content: center; }
.corridor-head h2 { font-size: var(--fs-3xl); font-weight: 500; line-height: 1.05; }
.corridor-lede { font-family: var(--font-serif); color: var(--c-ink-soft); font-size: 1.08rem; line-height: 1.7; max-width: 64ch; margin: 0 auto; }
.corridor-body { display: grid; grid-template-columns: minmax(280px, 5fr) minmax(0, 7fr); gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.corridor-stage { position: sticky; top: calc(var(--header-h) + 4vh); height: calc(100vh - var(--header-h) - 8vh); max-height: 720px; display: grid; grid-template-rows: 1fr auto auto auto; justify-items: center; align-content: center; gap: .3rem; }
.cs-frame { position: relative; width: min(100%, 420px); aspect-ratio: 1; display: grid; place-items: center; border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--era) 26%, var(--c-surface)), var(--c-bg) 92%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--c-gold) 22%, transparent), 0 0 0 14px color-mix(in srgb, var(--c-surface) 60%, transparent), 0 0 0 15px var(--c-line-soft), 0 40px 120px rgba(0, 0, 0, .5);
  transition: background 1.1s var(--ease); }
.cs-light { position: absolute; inset: -20% 10% 40%; background: radial-gradient(closest-side, rgba(255, 220, 160, .13), transparent); pointer-events: none; }
.cs-svg { width: 62%; height: auto; overflow: visible; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); }
.cs-g { opacity: 0; transform: scale(.92); transform-origin: center; transform-box: fill-box; transition: opacity .8s var(--ease), transform 1s var(--ease-slow); }
.cs-g.is-on { opacity: 1; transform: none; }
.cs-num { font-family: var(--font-display); font-size: clamp(3rem, 2rem + 3vw, 5rem); font-weight: 500; line-height: 1; margin: .6rem 0 0; color: color-mix(in srgb, var(--era) 45%, var(--c-ink)); transition: color 1s var(--ease); }
.cs-cap { margin: 0; font-size: .72rem; letter-spacing: .22em; text-transform: uppercase; color: var(--c-muted); }
.cs-rail { list-style: none; margin: 1.2rem 0 0; padding: 0; display: flex; gap: 4px; }
.cs-rail li { width: 22px; height: 3px; border-radius: 2px; background: var(--c-line); position: relative; transition: background .5s; }
.cs-rail li span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.cs-rail li.is-past { background: color-mix(in srgb, var(--c-gold) 45%, var(--c-line)); }
.cs-rail li.is-on { background: var(--c-gold); box-shadow: 0 0 10px var(--c-gold); }
.corridor-chapters { list-style: none; margin: 0; padding: 0; counter-reset: ch; }
.chapter { position: relative; isolation: isolate; min-height: 72vh; display: flex; flex-direction: column; justify-content: center; padding: 3rem 0 3rem 2.2rem; border-left: 1px solid var(--c-line-soft); }
.chapter::after { content: ''; position: absolute; left: -5px; top: 50%; width: 9px; height: 9px; border-radius: 50%; background: var(--c-bg); border: 1px solid var(--c-line); transition: background .5s, border-color .5s, box-shadow .5s; }
.chapter.is-current::after { background: var(--era); border-color: var(--c-gold); box-shadow: 0 0 0 5px color-mix(in srgb, var(--era) 25%, transparent), 0 0 24px var(--era); }
.chapter::before { inset: 8% -1rem 8% 0; border-radius: var(--radius-lg); }
.ch-glyph { display: none; }
.ch-eyebrow { color: color-mix(in srgb, var(--era) 40%, var(--c-gold)); }
.ch-num { font-family: var(--font-display); font-size: 1.5rem; letter-spacing: .04em; font-weight: 600; color: var(--c-ink); }
.ch-title { font-size: clamp(1.8rem, 1.2rem + 2vw, 2.9rem); font-weight: 500; line-height: 1.06; margin: .1rem 0 1rem; }
.ch-title a { color: var(--c-ink); text-decoration: none; background: linear-gradient(var(--c-gold), var(--c-gold)) 0 100% / 0 1px no-repeat; transition: background-size .5s var(--ease); }
.ch-title a:hover { background-size: 100% 1px; color: var(--c-ink); }
.ch-sum { font-family: var(--font-serif); font-size: 1.08rem; line-height: 1.72; color: var(--c-ink-soft); max-width: 60ch; }
.ch-marks { list-style: none; padding: 0; margin: .4rem 0 1.4rem; display: grid; gap: .1rem; max-width: 60ch; }
.ch-marks a { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 1rem; padding: .55rem 0; border-top: 1px solid var(--c-line-soft); text-decoration: none; color: var(--c-ink); font-size: .95rem; }
.ch-marks a:hover { color: var(--c-accent-strong); }
.ch-marks time { font-family: var(--font-mono); font-size: .76rem; color: var(--c-gold); padding-top: .15rem; }
.ch-enter { align-self: flex-start; display: inline-flex; align-items: center; gap: .5rem; font-size: .76rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; text-decoration: none; color: var(--c-gold); }
.ch-enter .ico { width: 15px; height: 15px; transition: transform .3s var(--ease); }
.ch-enter:hover .ico { transform: translateX(4px); }
.ch-count { color: var(--c-muted); letter-spacing: .08em; }
@media (max-width: 900px) {
  .corridor-body { grid-template-columns: minmax(0, 1fr); }
  .corridor-stage { display: none; }
  .chapter { min-height: 0; padding: 2.2rem 0 2.2rem 1.4rem; }
  .ch-glyph { display: block; width: 84px; margin-bottom: .6rem; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); }
  .chapter::after { top: 2.6rem; }
}

/* Ledger of the archive */
.ledger { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: var(--sp-7); border-top: 1px solid var(--c-line-soft); border-bottom: 1px solid var(--c-line-soft); }
.ledger-item { position: relative; isolation: isolate; display: flex; flex-direction: column; gap: .3rem; padding: 1.6rem 1.4rem; text-decoration: none; color: var(--c-ink); border-left: 1px solid var(--c-line-soft); }
.ledger-item:nth-child(4n + 1) { border-left: 0; }
.ledger-item:nth-child(n + 5) { border-top: 1px solid var(--c-line-soft); }
.ledger-n { font-family: var(--font-display); font-size: clamp(2.4rem, 1.8rem + 2vw, 3.6rem); font-weight: 500; line-height: 1; color: var(--c-ink); font-variant-numeric: lining-nums tabular-nums; }
.ledger-l { font-size: .68rem; letter-spacing: .2em; text-transform: uppercase; color: var(--c-muted); }
.ledger-item:hover { color: var(--c-ink); }
.ledger-item:hover .ledger-n { color: var(--c-gold); }
@media (max-width: 700px) { .ledger { grid-template-columns: 1fr 1fr; } .ledger-item { border-left: 0; } .ledger-item:nth-child(even) { border-left: 1px solid var(--c-line-soft); } .ledger-item:nth-child(n + 3) { border-top: 1px solid var(--c-line-soft); } .ledger-item { padding: 1.1rem .9rem; } }

/* Plaques: landmark events as museum wall labels */
.plaques { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 1px; background: var(--c-line-soft); border: 1px solid var(--c-line-soft); }
.plaque { position: relative; isolation: isolate; height: 100%; display: flex; flex-direction: column; gap: .5rem; padding: 1.5rem 1.4rem 1.6rem; background: var(--c-bg); text-decoration: none; color: var(--c-ink); }
.plaque time { font-family: var(--font-mono); font-size: .74rem; color: var(--c-gold); letter-spacing: .04em; }
.plaque time::before { content: ''; display: inline-block; width: 8px; height: 8px; margin-right: .6rem; background: var(--era); transform: rotate(45deg); box-shadow: 0 0 10px var(--era); vertical-align: 1px; }
.plaque strong { font-family: var(--font-display); font-size: 1.45rem; font-weight: 600; line-height: 1.12; }
.plaque span { font-family: var(--font-serif); font-size: .93rem; line-height: 1.6; color: var(--c-ink-soft); }
.plaque:hover { color: var(--c-ink); }
.plaque:hover strong { color: var(--c-accent-strong); }

/* Wings of the museum: four distinct exhibit treatments */
.wing-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--sp-5); }
.wing { position: relative; isolation: isolate; overflow: hidden; display: flex; flex-direction: column; gap: .7rem; padding: clamp(1.4rem, 1rem + 1.5vw, 2.4rem); border: 1px solid var(--c-line-soft); border-radius: var(--radius); color: var(--c-ink); text-decoration: none; background-color: var(--c-surface); background-image: var(--vitrine); }
a.wing:hover { color: var(--c-ink); border-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); }
.wing h3 { font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.3rem); font-weight: 500; line-height: 1.08; margin: 0; }
.wing h3 a { color: inherit; text-decoration: none; }
.wing p { margin: 0; font-family: var(--font-serif); line-height: 1.65; color: var(--c-ink-soft); max-width: 60ch; }
.wing-kicker { font-size: .66rem; letter-spacing: .22em; text-transform: uppercase; font-weight: 600; color: var(--c-gold); }
.wing-go { margin-top: auto; padding-top: .8rem; display: inline-flex; gap: .5rem; align-items: center; font-size: .74rem; letter-spacing: .16em; text-transform: uppercase; font-weight: 600; color: var(--c-gold); }
.wing-go .ico { width: 15px; height: 15px; transition: transform .3s var(--ease); }
a.wing:hover .wing-go .ico { transform: translateX(4px); }
.wing-story { grid-column: span 7; min-height: 360px; background-image: radial-gradient(80% 90% at 100% 0%, color-mix(in srgb, var(--era) 26%, transparent), transparent 70%), var(--vitrine); }
.wing-story .wing-sub { font-family: var(--font-display); font-style: italic; font-size: 1.3rem; color: var(--c-ink); }
.wing-glyph { position: absolute; right: -2rem; bottom: -2.5rem; width: 260px; color: var(--c-ink); opacity: .1; z-index: -1; pointer-events: none; }
.wing-case { grid-column: span 5; background-color: color-mix(in srgb, var(--c-gold-soft) 75%, var(--c-surface)); border-color: color-mix(in srgb, var(--c-gold) 30%, var(--c-line)); }
.wing-case .wing-parties { font-family: var(--font-display); font-size: 1.15rem; color: var(--c-ink); }
.wing-case .wing-parties em { color: var(--c-gold); padding: 0 .2em; }
.wing-seal { position: absolute; right: 1.2rem; top: .6rem; font-family: var(--font-display); font-size: 6rem; line-height: 1; color: color-mix(in srgb, var(--c-gold) 22%, transparent); z-index: -1; }
.wing-lectures { grid-column: span 7; }
.lec-strip { list-style: none; margin: .6rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 4px; }
.lec-strip a { display: grid; place-items: center; aspect-ratio: 1; font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; text-decoration: none; color: var(--c-ink-soft); border: 1px solid var(--c-line); border-radius: 2px; transition: background .25s, color .25s, border-color .25s; font-variant-numeric: lining-nums; }
.lec-strip a:hover, .lec-strip a:focus-visible { background: var(--c-gold); color: #1a1206; border-color: var(--c-gold); }
@media (max-width: 560px) { .lec-strip { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
.wing-lab { grid-column: span 5; background-image: linear-gradient(color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px), var(--vitrine); background-size: 22px 22px, 22px 22px, auto; }
.wing-lab .wing-kicker { color: var(--c-teal); }
.instruments { list-style: none; margin: .4rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .35rem; }
.instruments li { font: 500 .72rem var(--font-mono); padding: .25rem .55rem; border: 1px solid color-mix(in srgb, var(--c-teal) 45%, var(--c-line)); color: var(--c-teal); border-radius: 2px; }
@media (max-width: 900px) { .wing-story, .wing-case, .wing-lectures, .wing-lab { grid-column: 1 / -1; } .wing-story { min-height: 0; } }

/* Pioneers: a portrait gallery wall */
.pioneers { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 170px), 1fr)); gap: var(--sp-5) var(--sp-4); }
.pioneer { position: relative; isolation: isolate; display: flex; flex-direction: column; align-items: center; text-align: center; gap: .3rem; padding: 1.2rem .6rem; text-decoration: none; color: var(--c-ink); border-radius: var(--radius); }
.pioneer .portrait { margin-bottom: .7rem; transition: transform .5s var(--ease-slow), box-shadow .5s; }
.pioneer:hover .portrait { transform: translateY(-4px); box-shadow: 0 0 0 4px var(--c-surface), 0 0 0 5px var(--c-gold), 0 18px 40px rgba(0, 0, 0, .5); }
.pn-name { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; line-height: 1.1; }
.pn-life { font-family: var(--font-mono); font-size: .72rem; color: var(--c-gold); }
.pn-role { font-size: .78rem; color: var(--c-muted); line-height: 1.35; }
.pioneer:hover { color: var(--c-ink); }

.method .figure { margin-top: 0; }

/* ==========================================================================
   TIMELINE — explorer refinements + scroll-driven chronicle
   ========================================================================== */
.tl-viewport { background: linear-gradient(180deg, var(--c-surface), var(--c-bg)); border-color: var(--c-line-soft); border-radius: var(--radius); }
.tl-axis { border-top-color: color-mix(in srgb, var(--c-gold) 60%, transparent); }
.tl-tick { border-left-color: color-mix(in srgb, var(--c-gold) 60%, transparent); }
.tl-label { background: color-mix(in srgb, var(--c-bg) 82%, transparent); }
.tl-dot { box-shadow: 0 0 0 2px var(--c-bg), 0 0 10px var(--era); }
.tl-marker:hover .tl-label, .tl-marker:focus-visible .tl-label { background: var(--c-gold); color: #1a1206; }
.tl-marker:hover .tl-date, .tl-marker:focus-visible .tl-date { color: #1a1206; }
.tl-marker.is-selected .tl-label { background: var(--c-accent); color: #1a1206; }
.tl-seg-edge { border-left-color: var(--c-gold); }

.chronicle-sec { position: relative; isolation: isolate; transition: --era 1.2s var(--ease); }
.chron-wash { position: fixed; inset: 0; z-index: -1; pointer-events: none; transition: background 1.2s var(--ease);
  background-image: radial-gradient(50% 45% at 85% 55%, color-mix(in srgb, var(--era) 13%, transparent), transparent 70%); }
.chron-intro { max-width: 70ch; font-family: var(--font-serif); }
.chron-now { position: sticky; top: calc(var(--header-h) + 10px); z-index: 5; display: flex; align-items: baseline; gap: .8rem; width: fit-content; max-width: 100%; margin: 0 auto 1rem; padding: .45rem 1.1rem; border: 1px solid color-mix(in srgb, var(--era) 55%, var(--c-line)); border-radius: 999px;
  background: color-mix(in srgb, var(--c-bg) 86%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: 0 8px 30px rgba(0, 0, 0, .35); opacity: 0; transform: translateY(-6px); transition: opacity .4s, transform .4s var(--ease), border-color .8s; }
.chron-now.is-on { opacity: 1; transform: none; }
.cn-num { font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; color: color-mix(in srgb, var(--era) 45%, var(--c-ink)); }
.cn-title { font-family: var(--font-display); font-size: 1.05rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.cn-period { font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; color: var(--c-muted); white-space: nowrap; }
@media (max-width: 640px) { .cn-period { display: none; } }
#tl-list { position: relative; }
.chron-rail { position: sticky; top: calc(var(--header-h) + 70px); float: right; margin-right: -3.2rem; width: 2.4rem; display: flex; flex-direction: column; gap: 2px; z-index: 4; }
.chron-rail button { background: none; border: 0; padding: .2rem 0; cursor: pointer; font: 600 .7rem var(--font-display); color: var(--c-muted); border-right: 2px solid var(--c-line-soft); text-align: right; padding-right: .5rem; transition: color .3s, border-color .3s; }
.chron-rail button:hover, .chron-rail button.is-on { color: var(--c-ink); border-right-color: var(--era); }
@media (max-width: 1400px) { .chron-rail { display: none; } }
.chron-era { margin: 0 0 var(--sp-8); }
.chron-gate { position: relative; isolation: isolate; display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 2rem; align-items: center; min-height: 46vh; padding: 3.5rem 0 2.5rem; margin-bottom: 1.5rem; border-bottom: 1px solid color-mix(in srgb, var(--era) 45%, var(--c-line-soft)); }
.chron-gate::before { content: ''; position: absolute; inset: 0 -1rem; z-index: -2; background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--era) 10%, transparent) 60%, transparent); }
.gate-num { position: absolute; right: 0; top: 50%; transform: translateY(-50%); z-index: -1; font-family: var(--font-display); font-size: clamp(7rem, 16vw, 15rem); line-height: 1; font-weight: 500; color: color-mix(in srgb, var(--era) 18%, transparent); pointer-events: none; }
.gate-glyph { width: 140px; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); filter: drop-shadow(0 0 30px color-mix(in srgb, var(--era) 40%, transparent)); }
.gate-text h3 { font-size: clamp(1.9rem, 1.3rem + 2vw, 3rem); font-weight: 500; line-height: 1.05; margin: .2rem 0 .8rem; }
.gate-text h3 a { color: var(--c-ink); text-decoration: none; }
.gate-text h3 a:hover { color: var(--c-accent-strong); }
.gate-sum { font-family: var(--font-serif); color: var(--c-ink-soft); max-width: 62ch; margin: 0; }
@media (max-width: 640px) { .chron-gate { grid-template-columns: 70px minmax(0, 1fr); gap: 1rem; min-height: 0; padding: 2.4rem 0 1.6rem; } .gate-glyph { width: 70px; } }
.chron-spine { list-style: none; margin: 0; padding: 0; position: relative; }
.chron-spine::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: linear-gradient(var(--era), color-mix(in srgb, var(--era) 30%, var(--c-line-soft)) 30%, var(--c-line-soft)); }
.chron-ev { position: relative; width: 50%; padding: .5rem 2.4rem .5rem 0; }
.chron-ev:nth-child(even) { margin-left: 50%; padding: .5rem 0 .5rem 2.4rem; }
.chron-ev::before { content: ''; position: absolute; right: -4px; top: 1.35rem; width: 7px; height: 7px; border-radius: 50%; background: var(--c-bg); border: 1px solid var(--era); }
.chron-ev:nth-child(even)::before { right: auto; left: -4px; }
.chron-ev.imp-3::before { width: 11px; height: 11px; right: -6px; top: 1.25rem; border-radius: 1px; transform: rotate(45deg); background: var(--era); border-color: var(--c-gold); box-shadow: 0 0 14px var(--era); }
.chron-ev.imp-3:nth-child(even)::before { left: -6px; }
.chron-ev a { display: flex; flex-direction: column; gap: .3rem; padding: .9rem 1.1rem; text-decoration: none; color: var(--c-ink); border: 1px solid transparent; border-radius: var(--radius); transition: background .3s, border-color .3s; }
.chron-ev:nth-child(odd) a { text-align: right; align-items: flex-end; }
.chron-ev a:hover { background: var(--c-surface); border-color: var(--c-line-soft); color: var(--c-ink); }
.chron-ev time { font-family: var(--font-mono); font-size: .74rem; color: var(--c-gold); }
.chron-ev strong { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; line-height: 1.15; }
.chron-ev.imp-3 strong { font-size: 1.6rem; }
.chron-ev.imp-1 strong { font-size: 1.12rem; }
.ce-sum { font-family: var(--font-serif); font-size: .92rem; line-height: 1.55; color: var(--c-ink-soft); }
.chron-ev.imp-1 .ce-sum { display: none; }
.ce-meta { display: flex; gap: .35rem; flex-wrap: wrap; }
.chron-ev:nth-child(odd) .ce-meta { justify-content: flex-end; }
@media (max-width: 760px) {
  .chron-spine::before { left: 6px; }
  .chron-ev, .chron-ev:nth-child(even) { width: auto; margin-left: 0; padding: .3rem 0 .3rem 1.6rem; }
  .chron-ev::before, .chron-ev:nth-child(even)::before { left: 2px; right: auto; }
  .chron-ev.imp-3::before, .chron-ev.imp-3:nth-child(even)::before { left: 1px; }
  .chron-ev:nth-child(odd) a { text-align: left; align-items: flex-start; }
  .chron-ev:nth-child(odd) .ce-meta { justify-content: flex-start; }
  .chron-ev a { padding: .6rem .5rem; }
  .chron-ev.imp-1 .ce-sum { display: block; }
}

/* ==========================================================================
   RECORD PAGES
   ========================================================================== */
/* Biography */
.person-hero { position: relative; isolation: isolate; gap: clamp(1.5rem, 4vw, 3.5rem); padding: 1rem 0 2.2rem; border-bottom: 0; }
.person-hero::before { content: ''; position: absolute; z-index: -1; left: -10%; top: -40%; width: 60%; aspect-ratio: 1; pointer-events: none; background: radial-gradient(closest-side, var(--light-warm), transparent); }
.person-hero::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.person-hero .page-title { font-size: clamp(2.4rem, 1.6rem + 3.4vw, 4.6rem); margin-bottom: .1em; }
.person-hero .portrait-lg { width: 220px; height: 262px; }
.lifespan-lg { font-family: var(--font-mono); font-size: .95rem; letter-spacing: .06em; color: var(--c-gold); margin: 0 0 .9em; }
@media (max-width: 640px) { .person-hero .portrait-lg { width: 160px; height: 190px; } }
.lifeline { margin: 0 0 var(--sp-7); padding: 1rem 1.2rem 1.1rem; border: 1px solid var(--c-line-soft); border-radius: var(--radius); background: var(--c-surface); background-image: var(--vitrine); }
.ll-cap { display: flex; flex-wrap: wrap; gap: .3rem 1rem; align-items: baseline; margin-bottom: 1.6rem; }
.ll-cap .panel-title { margin: 0; color: var(--c-gold); }
.ll-track { position: relative; height: 34px; margin: 0 8px; }
.ll-life { position: absolute; left: 0; top: 15px; height: 3px; border-radius: 2px; background: linear-gradient(90deg, color-mix(in srgb, var(--c-gold) 40%, transparent), var(--c-gold)); box-shadow: 0 0 12px color-mix(in srgb, var(--c-gold) 45%, transparent); }
.ll-legacy { position: absolute; right: 0; top: 16px; height: 0; border-top: 1px dashed color-mix(in srgb, var(--c-gold) 55%, transparent); }
.ll-tick { position: absolute; top: 22px; height: 7px; border-left: 1px solid var(--c-line); }
.ll-tick span { position: absolute; top: 9px; left: 0; transform: translateX(-50%); font: .64rem var(--font-mono); color: var(--c-muted); white-space: nowrap; }
.ll-pt { position: absolute; top: 9px; width: 15px; height: 15px; margin-left: -7.5px; padding: 0; border-radius: 50%; border: 2px solid var(--c-gold); background: var(--c-bg); cursor: pointer; transition: transform .2s var(--ease), background .2s; }
.ll-pt.is-legacy { border-style: dashed; border-color: color-mix(in srgb, var(--c-gold) 60%, var(--c-muted)); }
.ll-pt:hover, .ll-pt:focus-visible { transform: scale(1.35); background: var(--c-gold); z-index: 3; }
.ll-tip { display: none; position: absolute; bottom: calc(100% + 10px); left: 50%; transform: translateX(-50%); width: max-content; max-width: min(300px, 70vw); padding: .55rem .75rem; border: 1px solid color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); border-radius: var(--radius); background: var(--c-surface-2); color: var(--c-ink); font: .8rem/1.45 var(--font-serif); text-align: left; box-shadow: var(--shadow-2); opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .2s; }
.ll-tip b { display: block; font: 600 .7rem var(--font-mono); color: var(--c-gold); margin-bottom: .15rem; }
.ll-pt:hover .ll-tip, .ll-pt:focus-visible .ll-tip { display: block; opacity: 1; visibility: visible; }
.ll-pt.ll-l .ll-tip { left: -4px; transform: none; }
.ll-pt.ll-r .ll-tip { left: auto; right: -4px; transform: none; }
.ll-ends { display: flex; justify-content: space-between; margin-top: 1rem; font: .74rem var(--font-mono); color: var(--c-muted); }
.mini-chrono { border-left-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); }
.mini-chrono li::before { border-color: var(--c-gold); background: var(--c-bg); }
.mc-date { color: var(--c-gold); }
.mini-chrono li.flash { animation: flash 1.6s var(--ease); }
@keyframes flash { 0%, 30% { background: color-mix(in srgb, var(--c-gold) 18%, transparent); } 100% { background: transparent; } }

/* Invention: drafting table */
.blueprint-head { position: relative; padding: clamp(1.4rem, 1rem + 2vw, 2.6rem); border-radius: var(--radius); border-color: color-mix(in srgb, var(--c-teal) 35%, var(--c-line)); background-color: color-mix(in srgb, var(--c-teal) 7%, var(--c-bg));
  background-image: linear-gradient(color-mix(in srgb, var(--c-teal) 12%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 12%, transparent) 1px, transparent 1px), linear-gradient(color-mix(in srgb, var(--c-teal) 5%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 5%, transparent) 1px, transparent 1px);
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px; }
.blueprint-head::before, .blueprint-head::after { content: ''; position: absolute; width: 22px; height: 22px; border: 1px solid var(--c-teal); pointer-events: none; }
.blueprint-head::before { top: 10px; left: 10px; border-right: 0; border-bottom: 0; }
.blueprint-head::after { bottom: 10px; right: 10px; border-left: 0; border-top: 0; }
.blueprint-head .page-title { font-size: clamp(2.3rem, 1.5rem + 3vw, 4.2rem); }
.stage-strip { border: 0; background: none; border-radius: 0; gap: 0; position: relative; counter-reset: st; }
.stage-strip::before { content: ''; position: absolute; left: 1rem; right: 1rem; top: 2.05rem; height: 1px; background: linear-gradient(90deg, var(--c-teal), var(--c-gold)); opacity: .6; }
.stage { border-right: 0; padding: .9rem 1rem 1rem; background: none; }
.stage::after { display: none; }
.stage-n { display: grid; place-items: center; width: 2.3rem; height: 2.3rem; border-radius: 50%; border: 1px solid var(--c-teal); background: var(--c-bg); font-size: 1.15rem; color: var(--c-teal); position: relative; z-index: 1; margin-bottom: .4rem; }
.stage:not(.empty) .stage-n { background: color-mix(in srgb, var(--c-teal) 18%, var(--c-bg)); box-shadow: 0 0 16px color-mix(in srgb, var(--c-teal) 35%, transparent); }
.stage.empty { opacity: .45; background: none; }
.stage-text { font-family: var(--font-serif); line-height: 1.5; color: var(--c-ink-soft); }
.stage-date { color: var(--c-gold); }
@media (max-width: 860px) { .stage-strip::before { left: 2.15rem; right: auto; top: 1rem; bottom: 1rem; width: 1px; height: auto; background: linear-gradient(var(--c-teal), var(--c-gold)); } .stage { border-bottom: 0; display: grid; grid-template-columns: 2.3rem minmax(0, 1fr); column-gap: 1rem; } .stage-n { grid-row: span 3; } }
.mechanism { background: color-mix(in srgb, var(--c-teal) 6%, var(--c-surface)); border-color: color-mix(in srgb, var(--c-teal) 30%, var(--c-line)); }

/* Story: cinematic long read */
.longread-head { position: relative; isolation: isolate; overflow: hidden; padding: clamp(2.5rem, 8vh, 6rem) 0 3rem; border-bottom: 0;
  background: radial-gradient(70% 100% at 85% 0%, color-mix(in srgb, var(--era) 30%, transparent), transparent 70%), linear-gradient(180deg, color-mix(in srgb, var(--era) 10%, var(--c-bg)), var(--c-bg)); }
.longread-head::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.lr-glyph { position: absolute; z-index: -1; right: max(2vw, calc(50% - 640px)); top: 50%; transform: translateY(-50%); width: clamp(180px, 30vw, 420px); color: var(--c-ink); opacity: .1; --glyph-accent: var(--c-ink); }
.longread-title { font-weight: 500; font-size: clamp(2.6rem, 1.6rem + 4.4vw, 5.6rem); line-height: .98; letter-spacing: -.02em; }
.longread-sub { color: var(--c-gold); }
.reading-progress span { background: linear-gradient(90deg, var(--era, var(--c-accent)), var(--c-gold)); box-shadow: 0 0 10px var(--c-gold); }
.longread-text .prose { font-size: 1.16rem; }
.longread-text h2 { font-weight: 500; font-size: 2rem; }
.longread-text h2::before { color: var(--c-gold); }
.longread-toc { border-left: 1px solid var(--c-line-soft); padding-left: 1rem; }
.longread-toc .panel-title { color: var(--c-gold); }
.next-story { position: relative; overflow: hidden; font-size: 1.7rem; font-weight: 500; }
.next-story:hover { border-color: var(--c-gold); color: var(--c-ink); }

/* Case: archival dossier */
.cases-hero { background: radial-gradient(60% 120% at 90% 0%, color-mix(in srgb, var(--c-gold) 18%, transparent), transparent 70%), var(--c-bg); border-bottom: 0; position: relative; }
.cases-hero::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.dossier { margin-top: 2.4rem; background-color: color-mix(in srgb, var(--c-gold-soft) 80%, var(--c-surface));
  background-image: linear-gradient(180deg, rgba(255, 240, 210, .05), transparent 30%), repeating-linear-gradient(0deg, transparent 0 31px, color-mix(in srgb, var(--c-gold) 7%, transparent) 31px 32px);
  border-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); box-shadow: 0 30px 80px rgba(0, 0, 0, .45), 0 0 0 1px rgba(0, 0, 0, .2); padding: clamp(1.4rem, 1rem + 2vw, 2.8rem); }
.dossier-tab { letter-spacing: .2em; font-weight: 600; }
.dossier .page-title { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.4rem); }
.dossier-short { font-family: var(--font-display); font-size: 1.5rem; color: var(--c-gold); }
.stamp { font-family: var(--font-sans); border-width: 2px; border-style: solid; box-shadow: inset 0 0 0 2px var(--c-gold-soft), inset 0 0 0 3px currentColor; padding: .45rem .9rem; mix-blend-mode: normal; opacity: .9; }
.dossier-parties .vs { font-size: 2.8rem; }
.dossier-parties ul { font-family: var(--font-display); font-size: 1.25rem; font-weight: 500; }
.lit-timeline::before { width: 1px; left: 11.5px; background: linear-gradient(var(--c-gold), var(--c-line-soft)); }
.lt-marker { background: var(--c-bg); border-width: 2px; }
.lt-ruling .lt-marker { background: var(--c-gold); border-color: var(--c-gold); box-shadow: 0 0 12px var(--c-gold); }
.lt-date { color: var(--c-gold); }
.outcome-box { border: 1px solid var(--c-gold); background: color-mix(in srgb, var(--c-gold-soft) 60%, var(--c-surface)); position: relative; }
.outcome-box::before { content: '⚖'; position: absolute; right: 1rem; top: .6rem; font-size: 1.6rem; color: color-mix(in srgb, var(--c-gold) 50%, transparent); }

/* Era pages */
.era-hero { position: relative; isolation: isolate; padding: 3rem 0 3.4rem; border-bottom: 0;
  background: radial-gradient(70% 120% at 80% 0%, color-mix(in srgb, var(--era) 34%, transparent), transparent 70%), linear-gradient(180deg, color-mix(in srgb, var(--era) 10%, var(--c-bg)), var(--c-bg)); }
.era-hero::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.era-hero-num { color: color-mix(in srgb, var(--era) 28%, transparent); z-index: -1; }
.era-hero-glyph { position: absolute; z-index: -1; right: max(14vw, calc(50% - 420px)); top: 50%; transform: translateY(-50%); width: clamp(140px, 22vw, 300px); color: var(--c-ink); opacity: .22; --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); }
.era-hero .page-title { font-size: clamp(2.3rem, 1.5rem + 3vw, 4.4rem); max-width: 18ch; }
.era-row { position: relative; isolation: isolate; grid-template-columns: 90px 64px 1fr 140px; background: var(--c-surface); background-image: linear-gradient(90deg, color-mix(in srgb, var(--era) 16%, transparent), transparent 45%); border: 1px solid var(--c-line-soft); border-left: 2px solid var(--era); }
.era-row-glyph { width: 56px; color: var(--c-ink); opacity: .75; --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); }
.era-row:hover .era-row-glyph { opacity: 1; }
.era-row .era-title { font-weight: 500; }
@media (max-width: 700px) { .era-row { grid-template-columns: 50px minmax(0, 1fr); } .era-row-glyph { display: none; } }
.era-tile { background: var(--c-surface); background-image: linear-gradient(160deg, color-mix(in srgb, var(--era) 20%, transparent), transparent 70%); border-color: var(--c-line-soft); border-top-color: var(--era); }

/* Lecture page */
.lecture-head { border-bottom: 0; padding: 2rem 0; }
.lecture-head::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.lec-num-xl { color: color-mix(in srgb, var(--c-gold) 14%, transparent); }
.lec-sec > h2 { border-bottom: 0; padding-bottom: 0; }
.lec-sec > h2::after { content: ''; display: block; width: 3rem; height: 1px; margin-top: .6rem; background: var(--c-gold); }
.ob-seg { background: color-mix(in srgb, var(--c-accent) 75%, var(--c-bg)); }
.ob-seg:nth-child(even) { background: color-mix(in srgb, var(--c-teal) 60%, var(--c-bg)); }

/* ==========================================================================
   PRESENTER — full-screen stage
   ========================================================================== */
.presenter { --p-bg: #070605; --p-ink: #f1e8d4; --p-muted: #a89e87; --p-accent: #e7b36f; --p-line: #2a251c; isolation: isolate; }
.presenter[data-bg="light"] { --p-bg: #f4ecdc; --p-ink: #1a1a18; --p-muted: #6b6252; --p-accent: #9c5a26; --p-line: #d8c8aa; }
.p-ambient { position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(70% 60% at 50% -10%, color-mix(in srgb, var(--era, #a8642e) 26%, transparent), transparent 70%), radial-gradient(50% 50% at 100% 100%, color-mix(in srgb, var(--p-accent) 8%, transparent), transparent 70%); }
.presenter[data-bg="light"] .p-ambient { opacity: .5; }
.p-progress { background: var(--p-line); background-image: repeating-linear-gradient(90deg, transparent 0 calc(100% / var(--n, 1) - 2px), var(--p-bg) calc(100% / var(--n, 1) - 2px) calc(100% / var(--n, 1))); }
.p-progress span { background: linear-gradient(90deg, var(--p-accent), #ffd79a); box-shadow: 0 0 12px var(--p-accent); transition: width .5s var(--ease-slow); }
.p-slide h1, .p-slide h2 { font-weight: 500; letter-spacing: -.015em; text-wrap: balance; }
.p-text h2 { font-size: clamp(2rem, 1.3rem + 2.8vw, 4rem); line-height: 1.04; }
.p-text h2::after { content: ''; display: block; width: 3.5rem; height: 1px; margin-top: .45em; background: var(--p-accent); }
.p-bullets { list-style: none; padding-left: 0; }
.p-bullets li { position: relative; padding-left: 1.4em; }
.p-bullets li::before { content: ''; position: absolute; left: .1em; top: .62em; width: .4em; height: .4em; transform: rotate(45deg); background: var(--p-accent); }
.p-title-slide { position: relative; isolation: isolate; }
.p-title-slide h1 { font-size: clamp(2.4rem, 1.4rem + 3.4vw + 1.6vh, 5.6rem); line-height: .98; }
.p-title-slide .p-sub { font-size: clamp(1rem, .8rem + .45vw + .4vh, 1.35rem); line-height: 1.6; max-width: 70ch; margin-left: auto; margin-right: auto; }
.p-bignum { position: absolute; z-index: -1; left: 50%; top: 50%; transform: translate(-50%, -54%); font-family: var(--font-display); font-weight: 500; font-size: clamp(14rem, 34vw, 30rem); line-height: 1; color: color-mix(in srgb, var(--p-accent) 7%, transparent); pointer-events: none; }
.p-glyph { width: clamp(64px, 8vh, 120px); margin: 0 auto 1rem; color: var(--p-ink); --glyph-accent: var(--p-accent); filter: drop-shadow(0 0 24px color-mix(in srgb, var(--p-accent) 40%, transparent)); }
.p-visual .figure { box-shadow: 0 30px 90px rgba(0, 0, 0, .55); border-color: var(--p-line); }
.p-visual .figure-media { box-shadow: none; padding: 8px; }
.p-notes { font-size: 1.12rem; border-left-color: var(--p-line); display: flex; flex-direction: column; gap: 1rem; }
.p-notes #p-notes-body { flex: 1; }
.p-next { border-top: 1px solid var(--p-line); padding-top: .8rem; font-family: var(--font-display); font-size: 1.15rem; color: var(--p-muted); }
.p-next p { margin: 0; }
.p-next .panel-title { color: var(--p-accent); font-family: var(--font-sans); margin-bottom: .3rem; }
.p-bar { background: color-mix(in srgb, var(--p-bg) 85%, transparent); backdrop-filter: blur(8px); }
.p-btn { border-radius: 999px; }
.presenter.show-help .p-help { display: block; position: absolute; inset: auto 50% 50% auto; transform: translate(50%, 50%); width: min(560px, 90vw); padding: 1.4rem 1.6rem; background: var(--p-bg); border: 1px solid var(--p-accent); border-radius: 8px; color: var(--p-ink); font-size: .95rem; line-height: 1.9; opacity: 1; z-index: 5; box-shadow: 0 30px 90px rgba(0, 0, 0, .6); }
.ov-item { border-radius: 4px; }
.ov-item.cur { box-shadow: 0 0 0 1px var(--p-accent), 0 0 20px color-mix(in srgb, var(--p-accent) 35%, transparent); }
.p-slide.p-enter > * { animation: p-in .7s var(--ease-slow) both; }
.p-slide.p-enter[data-dir="back"] > * { animation-name: p-in-back; }
.p-slide.p-enter > :nth-child(2) { animation-delay: .08s; }
.p-slide.p-enter > :nth-child(3) { animation-delay: .16s; }
.p-slide.p-enter > :nth-child(4) { animation-delay: .24s; }
.p-slide.p-enter .p-bullets li { animation: p-in .6s var(--ease-slow) both; animation-delay: calc(.18s + var(--i, 0) * .07s); }
@keyframes p-in { from { opacity: 0; transform: translateX(28px); } to { opacity: 1; transform: none; } }
@keyframes p-in-back { from { opacity: 0; transform: translateX(-28px); } to { opacity: 1; transform: none; } }
.p-title-slide.p-enter > .p-bignum { animation: p-num 1.2s var(--ease-slow) both; }
@keyframes p-num { from { opacity: 0; transform: translate(-50%, -50%) scale(.94); } to { opacity: 1; transform: translate(-50%, -54%); } }

/* ---------- Misc pages: gallery, quiz, glossary pick up the surfaces above ---------- */
.gal-item { background: var(--c-surface); border-color: var(--c-line-soft); }
.gal-item:hover { border-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); }
.stat-strip { box-shadow: var(--shadow-2); }

/* ---------- Reduced motion & print ---------- */
@media (prefers-reduced-motion: reduce) {
  .ov-light, .ov-cue-line, .mg .mg-glow, .mg .mg-spin, .mg .mg-blink, .mg .mg-pulse, .mg .mg-flow { animation: none !important; }
  .ha-spark { display: none; }
  .js-reveal .rv { opacity: 1 !important; transform: none !important; }
  .p-slide.p-enter > *, .p-slide.p-enter .p-bullets li { animation: none !important; }
}
html.reduce-motion .ha-spark { display: none; }
@media print {
  body::before, body::after, .ov-light, .corridor-stage, .chron-now, .chron-rail, .chron-wash, .p-ambient, .ov-cue { display: none !important; }
  .rv { opacity: 1 !important; transform: none !important; }
  .overture { min-height: 0; margin-top: 0; }
}

/* .section's vertical margin shorthand (base.css) cancelled .wrap's auto centring on wide screens. */
.wrap.section, .wrap.ledger { margin-left: auto; margin-right: auto; }
@media (max-width: 520px) { .ch-marks a { grid-template-columns: minmax(0, 1fr); gap: .15rem; } }
:root[data-theme="light"] .site-header { background: color-mix(in srgb, var(--c-midnight) 95%, transparent); }
.stage-n, .cs-num, .ch-num, .gate-num, .cn-num, .p-bignum, .era-num, .lec-num, .lec-num-xl { font-variant-numeric: lining-nums; }

/* ==========================================================================
   FOCUS & KEYBOARD — an outline is never overridden by component shadows
   ========================================================================== */
:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 3px; box-shadow: none; }
.nav a[hidden] { display: none !important; }
.nav-more > button.has-current { color: #f3d79b; box-shadow: inset 0 -1px 0 rgba(216, 182, 110, .7); }
.input:focus-visible, .lab-input:focus-visible, .lab-select:focus-visible, .search-box input:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 1px; }
.tl-viewport:focus-visible, .lab-scroll:focus-visible, .lab-svgwrap:focus-visible { outline-offset: -2px; }
h1[tabindex="-1"]:focus, h2[tabindex="-1"]:focus, main:focus { outline: none; box-shadow: none; }
.skip-link { background: var(--c-gold); color: #1a1206; font-weight: 600; box-shadow: var(--shadow-2); }
.skip-link:focus { color: #1a1206; }
.site-header :focus-visible { outline-color: #f2c98c; }
.nav-menu a:focus-visible, .site-header.is-compact .nav a:focus-visible { outline-offset: -2px; }

/* ==========================================================================
   INSTRUMENTS — lab illustrations (shared .mg drawing language)
   ========================================================================== */
.instrument { display: block; overflow: visible; }
.mg .mg-sm { font-size: 8px; }
.mg .mg-acc { fill: var(--glyph-accent, var(--c-gold)); }
.mg .in-bead { animation: in-bead 3.2s var(--ease) infinite; }
.mg .in-tick { transform-origin: 0 0; animation: in-tick 9s steps(12) infinite; }
.mg .in-flip { animation: mg-blink 2.4s steps(1) infinite; }
.mg .in-caret { animation: in-caret 4.8s steps(8) infinite; }
.mg .in-lamp { animation: in-lamp 2.4s ease-in-out infinite; }
.mg .in-head { animation: in-head 4s steps(1) infinite; }
.mg .in-cycle { opacity: 0; animation: in-cycle 3s steps(1) infinite; animation-delay: calc(var(--d, 0) * 1s); }
.mg .in-scan { animation: in-scan 4s steps(8) infinite; }
.mg .in-rows { animation: in-rows 3.5s steps(5) infinite; }
.mg .in-swap-r { animation: in-swap 3.2s var(--ease) infinite; --dx: 15px; }
.mg .in-swap-l { animation: in-swap 3.2s var(--ease) infinite; --dx: -15px; }
.mg .in-shackle { animation: in-shackle 4s var(--ease) infinite; }
.mg .in-packet-static { display: none; }
@keyframes in-bead { 0%, 35% { transform: none; } 50%, 85% { transform: translateY(-8px); } }
@keyframes in-tick { to { transform: rotate(360deg); } }
@keyframes in-caret { to { transform: translateX(106.4px); } }
@keyframes in-lamp { 50% { opacity: .35; } }
@keyframes in-head { 0% { transform: none; } 25% { transform: translateX(16px); } 50% { transform: translateX(32px); } 75% { transform: translateX(16px); } }
@keyframes in-cycle { 0% { opacity: 1; } 33.33% { opacity: 0; } }
@keyframes in-scan { to { transform: translateY(88px); } }
@keyframes in-rows { to { transform: translateY(70px); } }
@keyframes in-swap { 0%, 30% { transform: none; } 50%, 80% { transform: translateX(var(--dx)); } }
@keyframes in-shackle { 0%, 40%, 90%, 100% { transform: none; } 55%, 75% { transform: translateY(-6px); } }

/* ==========================================================================
   LABORATORY — exhibition hall
   ========================================================================== */
.expo-hero, .bench-hero { position: relative; isolation: isolate; overflow: hidden; }
.expo-hero::before, .bench-hero::before { content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(color-mix(in srgb, var(--c-teal) 10%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 10%, transparent) 1px, transparent 1px);
  background-size: 32px 32px; mask-image: radial-gradient(80% 90% at 80% 20%, #000, transparent 75%); -webkit-mask-image: radial-gradient(80% 90% at 80% 20%, #000, transparent 75%); }
.expo-hero::after, .bench-hero::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--hairline-gold); }
.expo-hero { padding: 1.6rem 0 2.6rem; background: radial-gradient(60% 120% at 85% 0%, color-mix(in srgb, var(--c-teal) 20%, transparent), transparent 70%), linear-gradient(180deg, color-mix(in srgb, var(--c-teal) 6%, var(--c-bg)), var(--c-bg)); }
.expo-hero .eyebrow { color: var(--c-teal); }
.expo-hero .page-title { font-size: clamp(2.6rem, 1.6rem + 4vw, 5rem); }
.expo-map { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.6rem; }
.expo-map a { display: inline-flex; align-items: center; gap: .6rem; min-height: 44px; padding: .35rem .9rem .35rem .4rem; border: 1px solid var(--c-line); border-radius: 999px; text-decoration: none; color: var(--c-ink); background: color-mix(in srgb, var(--c-surface) 70%, transparent); font-size: .86rem; transition: border-color .25s, background .25s; }
.expo-map a:hover { border-color: var(--c-teal); color: var(--c-ink); background: color-mix(in srgb, var(--c-teal) 10%, var(--c-surface)); }
.em-k { display: grid; place-items: center; width: 1.9rem; height: 1.9rem; border-radius: 50%; background: color-mix(in srgb, var(--c-teal) 25%, var(--c-bg)); border: 1px solid var(--c-teal); font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--c-ink); }
.em-n { font: .72rem var(--font-mono); color: var(--c-muted); }
.expo-body { padding-bottom: var(--sp-8); }
.hall { margin: var(--sp-8) 0 0; scroll-margin-top: calc(var(--header-h) + 16px); }
.hall-head { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.4rem; align-items: end; padding-bottom: 1.1rem; margin-bottom: 1.6rem; }
.hall-head::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: linear-gradient(90deg, var(--c-teal), color-mix(in srgb, var(--c-teal) 20%, transparent) 35%, var(--c-line-soft)); }
.hall-letter { font-family: var(--font-display); font-size: clamp(4rem, 3rem + 4vw, 7rem); line-height: .8; font-weight: 500; color: color-mix(in srgb, var(--c-teal) 50%, var(--c-ink)); font-variant-numeric: lining-nums; }
.hall-head .eyebrow { color: var(--c-teal); margin-bottom: .2rem; }
.hall-head h2 { font-size: var(--fs-2xl); margin: 0 0 .3rem; font-weight: 500; }
.hall-text { font-family: var(--font-serif); color: var(--c-ink-soft); margin: 0; max-width: 62ch; }
.exhibits { list-style: none; margin: 0; padding: 0; display: grid; grid-auto-flow: dense; grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); gap: var(--sp-5); }
.exhibit { position: relative; isolation: isolate; height: 100%; display: flex; flex-direction: column; overflow: hidden; text-decoration: none; color: var(--c-ink); border: 1px solid var(--c-line-soft); border-radius: var(--radius); background: var(--c-surface); background-image: var(--vitrine); transition: border-color .3s, transform .45s var(--ease-slow), box-shadow .45s; }
.exhibit:hover { color: var(--c-ink); border-color: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); transform: translateY(-3px); box-shadow: var(--shadow-2); }
.ex-case { position: relative; display: grid; place-items: center; aspect-ratio: 16 / 10; max-height: 250px; border-bottom: 1px solid var(--c-line-soft);
  background: radial-gradient(60% 75% at 50% 38%, color-mix(in srgb, var(--era) 30%, var(--c-surface-2)), var(--c-bg) 88%); }
.ex-case::after { content: ''; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(115deg, rgba(255, 255, 255, .07), transparent 38%); }
.ex-instrument { width: auto; height: 74%; max-width: 70%; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 40%, #f0c88a); filter: drop-shadow(0 10px 22px rgba(0, 0, 0, .45)); transition: transform .7s var(--ease-slow); }
.exhibit:hover .ex-instrument, .exhibit:focus-visible .ex-instrument { transform: scale(1.07); }
.exhibit .instrument * { animation-play-state: paused; }
.exhibit:hover .instrument *, .exhibit:focus-visible .instrument * { animation-play-state: running; }
.ex-body { flex: 1; display: flex; flex-direction: column; gap: .45rem; padding: 1.2rem 1.3rem 1.3rem; }
.ex-no { font: 600 .72rem var(--font-mono); letter-spacing: .12em; color: var(--c-gold); }
.exhibit h3 { margin: 0; font-size: 1.45rem; font-weight: 600; line-height: 1.12; }
.ex-sum { font-family: var(--font-serif); font-size: .93rem; line-height: 1.6; color: var(--c-ink-soft); }
.ex-foot { margin-top: auto; padding-top: .7rem; display: flex; flex-wrap: wrap; gap: .35rem .8rem; align-items: center; font-size: .72rem; letter-spacing: .05em; color: var(--c-muted); }
.ex-era { color: color-mix(in srgb, var(--era) 40%, var(--c-ink-soft)); }
.ex-tried { color: var(--c-success); border-color: color-mix(in srgb, var(--c-success) 50%, var(--c-line)); }
.ex-tried .ico { width: 13px; height: 13px; }
@media (min-width: 900px) {
  .exhibits { grid-template-columns: repeat(var(--rest, 3), minmax(0, 1fr)); }
  .exhibits > li:first-child { grid-column: 1 / -1; }
  .exhibits > li:first-child:not(:only-child) .exhibit, .exhibits > li:only-child .exhibit { flex-direction: row; }
  .exhibits > li:first-child:not(:only-child) .ex-case, .exhibits > li:only-child .ex-case { width: 42%; flex: none; aspect-ratio: auto; max-height: none; min-height: 280px; border-bottom: 0; border-right: 1px solid var(--c-line-soft); }
  .exhibits > li:first-child:not(:only-child) .ex-instrument, .exhibits > li:only-child .ex-instrument { height: auto; width: 46%; max-width: 230px; }
  .exhibits > li:first-child .ex-body { justify-content: center; padding: 2rem 2.4rem; }
  .exhibits > li:first-child .ex-sum { font-size: 1.02rem; max-width: 52ch; }
  .exhibits > li:first-child .ex-foot { margin-top: .6rem; }
  .exhibits > li:first-child:not(:only-child) h3, .exhibits > li:only-child h3 { font-size: 1.9rem; }
}

/* ==========================================================================
   LABORATORY — instrument bench (detail)
   ========================================================================== */
.bench-hero { padding: 1.4rem 0 2.6rem; background: radial-gradient(55% 110% at 80% 10%, color-mix(in srgb, var(--era) 30%, transparent), transparent 70%), linear-gradient(180deg, color-mix(in srgb, var(--era) 8%, var(--c-bg)), var(--c-bg)); }
.bench-hero-inner { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(200px, 1fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: center; }
.bench-hero .page-title { font-size: clamp(2.2rem, 1.4rem + 3vw, 4.2rem); }
.bh-actions { margin-top: 1.4rem; }
.bh-art { justify-self: center; width: 100%; max-width: 340px; aspect-ratio: 1; display: grid; place-items: center; border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--era) 28%, var(--c-surface)), var(--c-bg) 92%);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--c-gold) 22%, transparent), 0 0 0 12px color-mix(in srgb, var(--c-surface) 55%, transparent), 0 0 0 13px var(--c-line-soft), 0 30px 90px rgba(0, 0, 0, .45); }
.bh-instrument { width: 62%; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 40%, #f0c88a); filter: drop-shadow(0 12px 26px rgba(0, 0, 0, .45)); }
@media (max-width: 760px) { .bench-hero-inner { grid-template-columns: minmax(0, 1fr); } .bh-art { order: -1; max-width: 150px; margin-top: .6rem; } }
.bench-body { padding-top: 2.2rem; padding-bottom: var(--sp-8); }
.bench-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 1.6rem; align-items: start; }
.bench-layout.no-procedure { grid-template-columns: minmax(0, 1fr); }
.bench-layout.no-procedure .procedure { display: none; }
.procedure { position: sticky; top: calc(var(--header-h) + 16px); max-height: calc(100vh - var(--header-h) - 32px); overflow: auto; padding: 1.1rem 1rem; border: 1px solid var(--c-line-soft); border-radius: var(--radius); background: var(--c-surface); background-image: var(--vitrine); scrollbar-width: thin; }
.proc-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: .8rem; }
.proc-head h2 { margin: 0; font: 600 .74rem var(--font-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--c-gold); }
.proc-count { font: .78rem var(--font-mono); color: var(--c-muted); }
.proc-count.is-complete { color: var(--c-success); }
.proc-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: .3rem; }
.proc-step { display: grid; grid-template-columns: 1.75rem minmax(0, 1fr); gap: .7rem; width: 100%; padding: .6rem .55rem; border: 1px solid transparent; border-radius: var(--radius); background: none; color: var(--c-ink-soft); text-align: left; cursor: pointer; font: .88rem/1.55 var(--font-serif); transition: background .2s, border-color .2s, color .2s; }
.proc-step:hover { background: var(--c-surface-2); border-color: var(--c-line-soft); }
.proc-step code { font-size: .8em; }
.ps-n { display: grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: 50%; border: 1px solid var(--c-teal); font: 600 .78rem var(--font-sans); color: var(--c-teal); transition: background .2s, color .2s; }
.proc-step[aria-pressed="true"] { color: var(--c-muted); }
.proc-step[aria-pressed="true"] .ps-n { background: var(--c-teal); color: var(--c-bg); }
.proc-hint { margin: .8rem 0 0; font-size: .74rem; color: var(--c-muted); }
@media (max-width: 1100px) { .bench-layout { grid-template-columns: minmax(0, 1fr); } .procedure { position: static; max-height: none; } }
.bench { position: relative; min-width: 0; scroll-margin-top: calc(var(--header-h) + 12px); border: 1px solid color-mix(in srgb, var(--c-gold) 22%, var(--c-line)); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--c-surface), var(--c-bg) 70%); box-shadow: 0 30px 80px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 240, 210, .05); }
.bench-bar { display: flex; flex-wrap: wrap; gap: .6rem 1rem; align-items: center; justify-content: space-between; padding: .65rem 1rem; border-bottom: 1px solid var(--c-line-soft); background: color-mix(in srgb, var(--c-surface-2) 70%, transparent); border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
.bench-title { display: flex; align-items: center; gap: .6rem; margin: 0; font: 600 .74rem var(--font-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--c-gold); }
.bench-title::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--c-success); box-shadow: 0 0 10px var(--c-success); }
.bench-tools { display: flex; flex-wrap: wrap; gap: .4rem; }
.bench-btn { display: inline-flex; align-items: center; gap: .4rem; min-height: 40px; padding: .3rem .85rem; border: 1px solid var(--c-line); border-radius: 999px; background: transparent; color: var(--c-ink); font: 600 .78rem var(--font-sans); cursor: pointer; transition: border-color .2s, color .2s, background .2s; }
.bench-btn:hover { border-color: var(--c-gold); background: color-mix(in srgb, var(--c-gold) 8%, transparent); }
.bench-btn[aria-pressed="true"], .bench-btn[aria-expanded="true"] { border-color: var(--c-teal); color: var(--c-teal); }
.bench-btn .ico { width: 16px; height: 16px; }
.bench > .procedure { position: static; max-height: none; border: 0; border-bottom: 1px solid var(--c-line-soft); border-radius: 0; background: color-mix(in srgb, var(--c-surface-2) 45%, transparent); padding: 1rem clamp(1rem, .6rem + 1.5vw, 1.8rem); }
@media (max-width: 560px) {
  .bh-art { display: none; } /* decorative; on phones the experiment comes first */
  .bench-hero { padding: 1rem 0 1.6rem; }
  .bench-hero .page-lede { font-size: 1rem; }
  .bh-actions { margin-top: 1rem; }
  .bench-body { padding-top: 1.2rem; }
  .bench-bar { padding: .55rem .75rem; }
  .bench-btn { padding: .3rem .7rem; }
}
.bench .lab-host { padding: clamp(1rem, .6rem + 1.5vw, 1.8rem); }
.bench:fullscreen { overflow: auto; border-radius: 0; background: var(--c-bg); }
.bench:fullscreen .lab-host { max-width: 1400px; margin: 0 auto; }
.lab-background { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 3rem; align-items: center; margin-top: var(--sp-8); padding: 2.4rem 0; }
.lab-background::before { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 1px; background: var(--hairline-gold); }
.lab-background h2 { font-size: var(--fs-2xl); font-weight: 500; }
.lb-glyph { position: relative; width: 200px; color: var(--c-ink); --glyph-accent: color-mix(in srgb, var(--era) 45%, #f0c88a); opacity: .55; }
.lb-glyph span { position: absolute; right: -.4rem; bottom: -1rem; font: 500 3rem var(--font-display); color: color-mix(in srgb, var(--era) 45%, var(--c-ink)); font-variant-numeric: lining-nums; }
@media (max-width: 760px) { .lab-background { grid-template-columns: minmax(0, 1fr); } .lb-glyph { display: none; } }
.plate-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: var(--sp-5); }
.plate-grid .figure { margin: 0; }
.ll-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }
.ll-group h3 { font: 600 .72rem var(--font-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--c-muted); }
.lab-pager .pg-instrument { width: 46px; color: var(--c-ink); opacity: .75; --glyph-accent: var(--c-gold); margin-bottom: .3rem; }
.lab-pager .pager-next .pg-instrument { margin-left: auto; }

/* ==========================================================================
   LABORATORY — instrument controls (restyles the shared lab kit; behaviour unchanged)
   ========================================================================== */
.lab-root .lab-h { font-weight: 500; font-size: 1.4rem; }
.lab-root .lab-panel { background-color: var(--c-surface); background-image: var(--vitrine); border-color: var(--c-line-soft); border-radius: var(--radius); box-shadow: inset 0 1px 0 rgba(255, 240, 210, .04), 0 10px 30px rgba(0, 0, 0, .22); }
.lab-root .lab-viz { border-radius: var(--radius); background-image: radial-gradient(90% 90% at 50% 50%, transparent 55%, rgba(0, 0, 0, .18)), linear-gradient(color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px); background-size: auto, 20px 20px, 20px 20px; }
.lab-root .lab-btn { border-color: var(--c-line); background: linear-gradient(180deg, var(--c-surface-2), var(--c-surface)); box-shadow: inset 0 1px 0 rgba(255, 240, 210, .06), 0 1px 2px rgba(0, 0, 0, .3); transition: background-color .2s, border-color .2s, color .2s, box-shadow .2s; }
.lab-root .lab-btn:hover { border-color: var(--c-gold); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-gold) 14%, transparent); }
.lab-root .lab-btn--primary { background: linear-gradient(180deg, #e3a56c, #c9864a); border-color: #d99a5e; color: #1a1206; }
.lab-root .lab-btn--primary:hover { background: linear-gradient(180deg, #efb780, #d6935a); color: #1a1206; }
:root[data-theme="light"] .lab-root .lab-btn { box-shadow: 0 1px 2px rgba(40, 28, 10, .1); }
:root[data-theme="light"] .lab-root .lab-btn--primary { background: var(--c-accent); border-color: var(--c-accent); color: var(--c-accent-ink); }
.lab-root .lab-btn--ghost { background: transparent; box-shadow: none; }
.lab-root .lab-btn[aria-pressed="true"] { background: color-mix(in srgb, var(--c-teal) 22%, var(--c-surface)); border-color: var(--c-teal); color: var(--c-ink); box-shadow: inset 0 0 0 1px var(--c-teal), 0 0 14px color-mix(in srgb, var(--c-teal) 28%, transparent); }
.lab-root .lab-btn[aria-pressed="true"]:hover { background: color-mix(in srgb, var(--c-teal) 30%, var(--c-surface)); color: var(--c-ink); }
.lab-root .lab-btn:disabled { box-shadow: none; }
.lab-root .lab-input, .lab-root .lab-select { border-radius: var(--radius); background-color: var(--c-bg); box-shadow: inset 0 1px 3px rgba(0, 0, 0, .3); }
.lab-root .lab-select { appearance: none; -webkit-appearance: none; padding-right: 2rem; background-repeat: no-repeat; background-position: right .65rem center; background-size: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%23c9a14a' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E"); }
.lab-root .lab-range { -webkit-appearance: none; appearance: none; background: transparent; min-height: 24px; }
.lab-root .lab-range::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); }
.lab-root .lab-range::-moz-range-track { height: 4px; border-radius: 2px; background: color-mix(in srgb, var(--c-gold) 40%, var(--c-line)); }
.lab-root .lab-range::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -8px; border-radius: 50%; border: 1px solid #f0c88a; background: radial-gradient(circle at 35% 35%, #ffe2b0, #c9864a 60%, #7d5226); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-gold) 16%, transparent), 0 2px 6px rgba(0, 0, 0, .5); }
.lab-root .lab-range::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; border: 1px solid #f0c88a; background: radial-gradient(circle at 35% 35%, #ffe2b0, #c9864a 60%, #7d5226); box-shadow: 0 2px 6px rgba(0, 0, 0, .5); }
.lab-root .lab-range:focus-visible { outline: none; }
.lab-root .lab-range:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 3px var(--c-bg), 0 0 0 5px var(--focus-color); }
.lab-root .lab-range:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 3px var(--c-bg), 0 0 0 5px var(--focus-color); }
.lab-root .lab-check input { accent-color: var(--c-gold); }
.lab-root .lab-status { font-family: var(--font-mono); font-size: .84rem; background: color-mix(in srgb, var(--c-teal) 6%, var(--c-bg)); border-left-width: 3px; box-shadow: inset 0 0 18px rgba(0, 0, 0, .2); }
.lab-root .lab-status.is-ok { background: color-mix(in srgb, var(--c-success) 9%, var(--c-bg)); }
.lab-root .lab-status.is-err { background: color-mix(in srgb, var(--c-danger) 9%, var(--c-bg)); }
.lab-root .lab-status.is-warn { background: color-mix(in srgb, var(--c-warn) 10%, var(--c-bg)); }
.lab-root .lab-reg { background: var(--c-bg); border-color: var(--c-line); box-shadow: inset 0 1px 4px rgba(0, 0, 0, .35); }
.lab-root .lab-reg > b { font-family: var(--font-mono); text-shadow: 0 0 10px color-mix(in srgb, var(--c-accent) 35%, transparent); }
:root[data-theme="light"] .lab-root .lab-reg > b { text-shadow: none; }
:root[data-theme="light"] .lab-root .lab-status, :root[data-theme="light"] .lab-root .lab-reg, :root[data-theme="light"] .lab-root .lab-input, :root[data-theme="light"] .lab-root .lab-select { box-shadow: none; }
.lab-root .lab-table thead th { background: var(--c-surface-3); letter-spacing: .03em; }
.lab-root :focus-visible { outline: 2px solid var(--focus-color); outline-offset: 2px; }

/* ---------- Gallery: inline diagram thumbnails (theme-aware) ---------- */
.gal-item { transition: border-color .3s, transform .4s var(--ease-slow), box-shadow .4s; }
.gal-item:hover { transform: translateY(-2px); }
.gal-svg { display: block; height: 190px; padding: 12px; background: var(--dg-bg); border-bottom: 1px solid var(--c-line-soft); overflow: hidden; }
.gal-item .gal-svg img { display: block; width: 100%; height: 100%; padding: 0; object-fit: contain; background: none; transition: transform .6s var(--ease-slow); }
.gal-item .gal-svg img:not([src]) { visibility: hidden; }
.gal-item:hover .gal-svg img { transform: scale(1.04); }

/* ---------- Reduced motion for the additions ---------- */
@media (prefers-reduced-motion: reduce) {
  .instrument *, .mg .in-cycle { animation: none !important; }
  .mg .in-cycle[style*="--d:0"] { opacity: 1; }
  .in-packets { display: none; }
  .mg .in-packet-static { display: inline; }
  .exhibit:hover, .exhibit:hover .ex-instrument, .gal-item:hover, .gal-item:hover .gal-svg img { transform: none; }
}

/* Light (reading room) adjustments for the laboratory */
:root[data-theme="light"] .bench { box-shadow: 0 18px 48px rgba(40, 28, 10, .12), inset 0 1px 0 rgba(255, 255, 255, .6); }
:root[data-theme="light"] .lab-root .lab-panel { box-shadow: var(--shadow-1); }
:root[data-theme="light"] .lab-root .lab-viz { background-image: linear-gradient(color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in srgb, var(--c-teal) 8%, transparent) 1px, transparent 1px); background-size: 20px 20px; }
:root[data-theme="light"] .bh-art { box-shadow: 0 0 0 1px color-mix(in srgb, var(--c-gold) 30%, transparent), 0 0 0 12px color-mix(in srgb, var(--c-surface) 70%, transparent), 0 0 0 13px var(--c-line-soft), 0 24px 60px rgba(40, 28, 10, .16); }
:root[data-theme="light"] .bh-instrument, :root[data-theme="light"] .ex-instrument { filter: none; --glyph-accent: color-mix(in srgb, var(--era) 55%, #9c5a26); }
:root[data-theme="light"] .ex-case::after { background: linear-gradient(115deg, rgba(255, 255, 255, .35), transparent 38%); }