/* ==========================================================================
   ATLAS — shared design system for the Ethos Prevention websites
   Concept: The Atlas of Prevention. Museum-gallery typography, specimen
   plates, Tufte marginalia, one living pulse line. No frameworks.
   Tokens are defined per site in theme.css (loaded before this file).
   ========================================================================== */

/* ---------- Fonts (self-hosted, subset, zero third-party requests) ------- */

@font-face {
  font-family: "Fraunces";
  src: url("../fonts/Fraunces-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fraunces";
  src: url("../fonts/Fraunces-Italic-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("../fonts/InstrumentSans-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("../fonts/InstrumentSans-Italic-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/IBMPlexMono-Medium.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

/* ---------- Reset ------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }

/* ---------- Root type --------------------------------------------------- */

body {
  background: var(--ground);
  color: var(--ink);
  font-family: "Instrument Sans", system-ui, sans-serif;
  font-size: clamp(1.02rem, 0.97rem + 0.25vw, 1.13rem);
  line-height: 1.65;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--ground); }

/* ---------- Type roles -------------------------------------------------- */

.display, h1, .h-display {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144, "SOFT" 0, "WONK" 0;
  font-weight: 330;
  letter-spacing: -0.018em;
  line-height: 1.04;
}
.display em, h1 em { font-style: italic; font-weight: 300; }

h2, .h-room {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 100, "SOFT" 0, "WONK" 0;
  font-weight: 350;
  letter-spacing: -0.014em;
  line-height: 1.1;
  font-size: clamp(2rem, 1.5rem + 2.4vw, 3.4rem);
}
h2 em { font-style: italic; font-weight: 320; }

h3, .h-piece {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 40, "SOFT" 0, "WONK" 0;
  font-weight: 420;
  letter-spacing: -0.008em;
  line-height: 1.2;
  font-size: clamp(1.25rem, 1.1rem + 0.7vw, 1.6rem);
}

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2.2rem; height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 0.8rem;
  opacity: 0.7;
}
.hero .eyebrow, .room-dark .eyebrow { color: var(--accent-on-dark, var(--accent)); }
.hero .eyebrow::before, .room-dark .eyebrow::before { background: var(--accent-on-dark, var(--accent)); }

.lede {
  font-size: clamp(1.18rem, 1.06rem + 0.6vw, 1.45rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 56ch;
  font-weight: 400;
}

.mono { font-family: "IBM Plex Mono", monospace; }

p { max-width: 62ch; }
p + p { margin-top: 1.1em; }
strong { font-weight: 600; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }

/* ---------- Layout primitives ------------------------------------------- */

.wrap { width: min(100% - clamp(2.5rem, 6vw, 6rem), 1280px); margin-inline: auto; }
.wrap-wide { width: min(100% - clamp(1.5rem, 4vw, 4rem), 1480px); margin-inline: auto; }

.room { padding-block: clamp(5.5rem, 11vw, 10rem); position: relative; }
.room + .room { border-top: 1px solid var(--rule); }
.room-dark {
  background: var(--ink-deep);
  color: var(--ground);
  border-top: none;
}
.room-dark .lede { color: var(--ground-soft); }
.room-dark h2, .room-dark h3 { color: var(--ground); }

/* Prose column with Tufte margin: content occupies ~60%, notes float right */
.annotated { max-width: 66ch; position: relative; }
.annotated > * { max-width: 60ch; }

.sidenote {
  float: right;
  clear: right;
  width: 15.5rem;
  margin-right: -19rem;
  margin-top: 0.15em;
  margin-bottom: 1em;
  padding-left: 1.1rem;
  border-left: 1px solid var(--rule);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.71rem;
  line-height: 1.65;
  color: var(--ink-faint);
}
.sidenote .sn-num {
  color: var(--accent);
  font-weight: 500;
  margin-right: 0.35em;
}
.room-dark .sidenote { color: var(--ground-faint); border-left-color: var(--rule-dark); }

sup.ref {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68em;
  color: var(--accent);
  letter-spacing: 0;
  margin-left: 0.1em;
}

@media (max-width: 1100px) {
  .sidenote {
    float: none;
    width: auto;
    margin: 0.9em 0 1.4em;
    padding: 0.7rem 0 0.1rem 1rem;
  }
}

/* ---------- Rules & hairlines ------------------------------------------- */

.rule { border: none; border-top: 1px solid var(--rule); margin-block: clamp(2.5rem, 5vw, 4.5rem); }
.room-dark .rule { border-top-color: var(--rule-dark); }

/* ---------- Header ------------------------------------------------------ */

.site-header {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-block: 1.4rem;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand-lockup { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.brand-lockup .mark { width: 2.1rem; height: 2.1rem; flex: none; }
.brand-name {
  font-family: "Fraunces", serif;
  font-variation-settings: "opsz" 40;
  font-weight: 400;
  font-size: 1.45rem;
  letter-spacing: 0.01em;
  color: var(--header-ink, var(--ink));
  line-height: 1.05;
}
.brand-name small {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--header-faint, var(--ink-faint));
  margin-top: 0.28rem;
}
nav.primary ul {
  display: flex; gap: clamp(1.2rem, 2.4vw, 2.4rem);
  list-style: none; margin: 0; padding: 0; align-items: center;
}
nav.primary a {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--header-soft, var(--ink-soft));
  text-decoration: none;
  padding-block: 0.6rem;
  position: relative;
}
nav.primary a:hover { color: var(--header-ink, var(--ink)); }
nav.primary a[aria-current="page"] { color: var(--header-ink, var(--ink)); }
nav.primary a[aria-current="page"]::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0.15rem;
  height: 1px; background: var(--accent);
}
.nav-toggle { display: none; }

@media (max-width: 900px) {
  .site-header .wrap { flex-wrap: wrap; }
  nav.primary { width: 100%; }
  nav.primary ul { flex-wrap: wrap; gap: 0.4rem 1.4rem; }
  nav.primary a { display: inline-block; padding-block: 0.5rem; min-height: 44px; }
}

/* ---------- Buttons ------------------------------------------------------ */

.btn {
  display: inline-flex; align-items: center; gap: 0.7rem;
  min-height: 3.4rem;
  padding: 0.9rem 1.7rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background 240ms ease, color 240ms ease, border-color 240ms ease;
}
.btn .arr { transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1); }
.btn:hover .arr { transform: translateX(4px); }
.btn-primary { background: var(--ink); color: var(--ground); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--ground); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink-faint); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }
.on-dark .btn-primary { background: var(--ground); color: var(--ink); border-color: var(--ground); }
.on-dark .btn-primary:hover { background: var(--accent-on-dark, var(--accent)); border-color: var(--accent-on-dark, var(--accent)); color: var(--ink-deep); }
.on-dark .btn-ghost { color: var(--ground); border-color: var(--ground-faint); }
.on-dark .btn-ghost:hover { border-color: var(--ground); color: var(--ground); }

.action-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }

/* ---------- Hero ---------------------------------------------------------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: clip;
  background: var(--ink-deep);
  color: var(--ground);
}
.hero-media { position: absolute; inset: 0; }
.hero-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: 0.95;
}
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(to top, color-mix(in oklab, var(--ink-deep) 82%, transparent) 4%, transparent 42%),
    linear-gradient(78deg, var(--ink-deep) 16%, color-mix(in oklab, var(--ink-deep) 68%, transparent) 42%, transparent 68%);
}
.hero-light {
  background: var(--ground);
  color: var(--ink);
}
.hero-light .hero-media::after {
  background:
    linear-gradient(to top, color-mix(in oklab, var(--ground) 85%, transparent) 2%, transparent 38%),
    linear-gradient(78deg, var(--ground) 26%, color-mix(in oklab, var(--ground) 62%, transparent) 52%, transparent 80%);
}
.hero-content {
  position: relative;
  padding-block: clamp(6rem, 12vh, 9rem) clamp(4rem, 8vh, 6rem);
  max-width: 68rem;
}
.hero h1 {
  font-size: clamp(2.7rem, 1.8rem + 4.3vw, 5.6rem);
  margin-top: 1.4rem;
  text-wrap: balance;
}
.hero .lede { margin-top: 1.8rem; }
.hero-light .lede { color: var(--ink-soft); }

.pulse-line {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  width: 100%; height: 5.5rem;
  pointer-events: none;
  opacity: 0.85;
}
.pulse-line path { fill: none; stroke-width: 1.5; }

html.capture .hero { min-height: 44rem; }

/* ---------- Plates (specimen art) ---------------------------------------- */

.plate { position: relative; }
.plate img {
  width: 100%; height: auto;
  outline: 1px solid var(--rule);
  outline-offset: 0.6rem;
}
.room-dark .plate img, .plate.on-dark img { outline-color: var(--rule-dark); }
.plate figcaption {
  display: flex; justify-content: space-between; gap: 1rem;
  margin-top: 1.3rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.room-dark .plate figcaption { color: var(--ground-faint); }
.plate figcaption .plate-no { color: var(--accent); font-weight: 500; }

/* ---------- Monumental statistics ----------------------------------------- */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: clamp(2.5rem, 5vw, 5rem);
}
.stat .num {
  font-family: "Fraunces", serif;
  font-variation-settings: "opsz" 144;
  font-weight: 300;
  font-size: clamp(4rem, 3rem + 5vw, 7.5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stat .num .unit { font-size: 0.45em; font-style: italic; letter-spacing: 0; }
.stat.key .num { color: var(--accent); }
.room-dark .stat .num { color: var(--ground); }
.room-dark .stat.key .num { color: var(--accent-on-dark, var(--accent)); }
.stat .cap {
  margin-top: 1.1rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  line-height: 1.7;
  text-transform: uppercase;
  color: var(--ink-faint);
  max-width: 24ch;
}
.room-dark .stat .cap { color: var(--ground-faint); }

/* ---------- Ledger (comparison tables as editorial lists) ----------------- */

.ledger { border-top: 1px solid var(--rule); }
.ledger-row {
  display: grid;
  grid-template-columns: minmax(10rem, 16rem) 1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: 1.6rem;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.ledger-row .l-head {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.ledger-row .l-body { max-width: 60ch; }
.ledger-row .l-body h3 { margin-bottom: 0.35em; }
.ledger-row .l-body p { color: var(--ink-soft); }
.room-dark .ledger { border-top-color: var(--rule-dark); }
.room-dark .ledger-row { border-bottom-color: var(--rule-dark); }
.room-dark .ledger-row .l-body p { color: var(--ground-soft); }

@media (max-width: 760px) {
  .ledger-row { grid-template-columns: 1fr; gap: 0.5rem; padding-block: 1.3rem; }
}

/* ---------- Pull quote ----------------------------------------------------- */

.pull {
  font-family: "Fraunces", serif;
  font-variation-settings: "opsz" 100;
  font-style: italic;
  font-weight: 320;
  font-size: clamp(1.7rem, 1.3rem + 2vw, 2.9rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  max-width: 26ch;
  hanging-punctuation: first;
  text-indent: -0.42em;
}
.pull footer, .pull-attrib {
  font-family: "IBM Plex Mono", monospace;
  font-style: normal;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1.6rem;
  text-indent: 0;
}

/* ---------- Instruments (signature interactives) --------------------------- */

.instrument { margin-top: clamp(2.5rem, 5vw, 4rem); }
.instrument-stage { position: relative; }
.instrument svg { width: 100%; height: auto; }
.instrument-readout {
  font-family: "Fraunces", serif;
  font-variation-settings: "opsz" 40;
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.8rem);
  line-height: 1.35;
  max-width: 40ch;
}
.instrument-note {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  line-height: 1.7;
  color: var(--ink-faint);
  max-width: 52ch;
  margin-top: 1.4rem;
}
.room-dark .instrument-note { color: var(--ground-faint); }

.factor-list { list-style: none; padding: 0; margin: 0; }
.factor-list li {
  position: relative;
  display: flex; align-items: baseline; gap: 1rem;
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--rule-dark, var(--rule));
  font-size: 0.95rem;
}
.factor-list li::before {
  content: "";
  position: absolute; left: 0; bottom: -1px;
  height: 2px; width: 0;
  background: var(--accent-on-dark, var(--accent));
  transition: width 1400ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--i, 0) * 90ms + 200ms);
}
.instrument.revealed .factor-list li::before,
.revealed .factor-list li::before { width: calc(var(--par) * 1%); }
.factor-list .f-ix {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  color: var(--accent-on-dark, var(--accent));
  min-width: 1.6rem;
}
.factor-list .f-val {
  margin-left: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--ground-soft, var(--ink-soft));
}
.factor-list .f-val::after { content: "%"; font-size: 0.65em; margin-left: 0.1em; opacity: 0.7; }
.factor-list .f-row {
  display: flex; align-items: baseline; gap: 1rem; width: 100%;
  padding-block: 0.2rem;
}
.factor-list li:hover .f-name { color: var(--accent-on-dark, var(--accent)); }

input[type="range"].slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%; max-width: 34rem; height: 2.75rem;
  background: transparent; cursor: pointer;
}
input[type="range"].slider::-webkit-slider-runnable-track { height: 1px; background: var(--slider-track, var(--ink-faint)); }
input[type="range"].slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1.35rem; height: 1.35rem; margin-top: -0.65rem;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--ground);
  box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"].slider::-moz-range-track { height: 1px; background: var(--slider-track, var(--ink-faint)); }
input[type="range"].slider::-moz-range-thumb {
  width: 1.1rem; height: 1.1rem; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--ground);
  box-shadow: 0 0 0 1px var(--accent);
}
.slider-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint);
  display: flex; justify-content: space-between; max-width: 34rem;
}

/* ---------- Forms ----------------------------------------------------------- */

.form-grid { display: grid; gap: 2.2rem; max-width: 40rem; }
.field label {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.55rem;
}
.field input, .field select, .field textarea {
  width: 100%;
  min-height: 3rem;
  background: color-mix(in oklab, var(--ink) 3%, transparent);
  border: none;
  border-bottom: 1.5px solid var(--ink-soft);
  padding: 0.75rem 0.5rem 0.8rem;
  font-size: 1.05rem;
  color: var(--ink);
  border-radius: 0;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23777' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  cursor: pointer;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-bottom-color: var(--accent);
  background-color: color-mix(in oklab, var(--accent) 4%, transparent);
}
.field ::placeholder { color: var(--ink-faint); opacity: 0.7; }
.form-status {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.74rem; line-height: 1.7;
  color: var(--ink-soft);
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
  max-width: 46ch;
}

/* ---------- References ledger ------------------------------------------------ */

.refs { counter-reset: ref; }
.refs li {
  counter-increment: ref;
  list-style: none;
  position: relative;
  padding-left: 2.8rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--ink-soft);
  max-width: 72ch;
}
.refs li::before {
  content: counter(ref, decimal-leading-zero);
  position: absolute; left: 0; top: 1.35rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: var(--accent);
}
.refs li em { color: var(--ink); }
a.doi {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent);
}
a.doi:hover { border-bottom-style: solid; }
.room-dark a.doi { color: var(--accent-on-dark, var(--accent)); border-bottom-color: var(--accent-on-dark, var(--accent)); }

/* ---------- Footer -------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: clamp(3.5rem, 7vw, 6rem) 3rem;
  font-size: 0.88rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(14rem, 1.2fr) repeat(auto-fit, minmax(10rem, 1fr));
  gap: clamp(2rem, 5vw, 5rem);
}
.site-footer h4 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.66rem; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1.1rem;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.footer-brand p { color: var(--ink-faint); font-size: 0.82rem; max-width: 30ch; margin-top: 1rem; }
.disclaimer {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  padding-top: 1.8rem;
  border-top: 1px solid var(--rule);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  line-height: 1.8;
  color: var(--ink-faint);
  max-width: 90ch;
}
.colophon {
  margin-top: 2rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ---------- Focus ---------------------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--focus, var(--accent));
  outline-offset: 3px;
}
.room-dark :focus-visible, .hero :focus-visible { outline-color: var(--focus-dark, #FFD9D2); }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--ground);
  padding: 0.8rem 1.2rem;
  font-family: "IBM Plex Mono", monospace; font-size: 0.75rem;
}
.skip:focus { left: 0.5rem; top: 0.5rem; }

/* ---------- Motion primitives ----------------------------------------------------- */

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  filter: blur(3px);
  transition:
    opacity 700ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 700ms cubic-bezier(0.22, 1, 0.36, 1),
    filter 700ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}
html.js [data-reveal].revealed { opacity: 1; transform: none; filter: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; filter: none; transition: none; }
  .btn .arr { transition: none; }
}

/* ---------- Grain -------------------------------------------------------------------- */

.grain {
  position: fixed; inset: 0; z-index: 90;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Exhibition band (full-bleed plate interlude) -------------------- */

.band {
  position: relative;
  height: min(74vh, 48rem);
  overflow: clip;
  border-block: 1px solid var(--rule);
}
.band img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: var(--band-pos, center);
}
.band figcaption {
  position: absolute;
  left: clamp(1.25rem, 5vw, 4rem); right: clamp(1.25rem, 5vw, 4rem); bottom: 1.6rem;
  display: flex; justify-content: space-between; gap: 1.2rem; align-items: baseline;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ground);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.55);
}
.band figcaption .plate-no { color: var(--accent-on-dark, var(--accent)); font-weight: 500; }
.band.is-light figcaption { color: var(--ink); text-shadow: 0 1px 8px rgba(255, 255, 255, 0.6); }
.band.is-light figcaption .plate-no { color: var(--accent); }

/* ---------- Utility ------------------------------------------------------------------- */

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}
.center-narrow { max-width: 46rem; margin-inline: auto; text-align: center; }
.center-narrow p { margin-inline: auto; }
.mt-l { margin-top: clamp(2.5rem, 5vw, 4rem); }
.mt-xl { margin-top: clamp(4rem, 8vw, 7rem); }
.cols-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(26rem, 100%), 1fr)); gap: clamp(2.5rem, 6vw, 6rem); align-items: start; }
.cols-2.left-wide { grid-template-columns: minmax(min(30rem, 100%), 1.35fr) minmax(min(20rem, 100%), 1fr); }
@media (max-width: 900px) { .cols-2.left-wide { grid-template-columns: 1fr; } }

/* ---------- Mobile fit (≤760px) -------------------------------------------------------- */

@media (max-width: 760px) {
  /* curated hard breaks are desktop-only — let display type flow naturally */
  h1 br, h2 br, .h-room br, .h-piece br { display: none; }
  /* footer columns stack */
  .footer-grid { grid-template-columns: 1fr; gap: 2.2rem; }
  /* hero + page-head must clear the taller wrapped header */
  .hero-content { padding-top: clamp(10.5rem, 22vh, 13rem); }
  .page-head { padding-top: clamp(11.5rem, 22vh, 14rem); }
  /* tighter nav so the header stays compact */
  nav.primary a { font-size: 0.68rem; letter-spacing: 0.12em; }
  /* tighter vertical rhythm */
  .room { padding-block: clamp(3.6rem, 9vw, 5.5rem); }
  h2, .h-room { margin-bottom: 0.5em; }
  /* slider thumb grows to a proper touch target */
  input[type="range"].slider::-webkit-slider-thumb { width: 1.6rem; height: 1.6rem; margin-top: -0.78rem; }
  input[type="range"].slider::-moz-range-thumb { width: 1.35rem; height: 1.35rem; }
  /* exhibition band holds usable height */
  .band { height: min(56vh, 30rem); }
}

/* dark-room accent legibility (garnet-on-garnet / red-on-ink fixes) */
.room-dark .sidenote .sn-num,
.room-dark .plate figcaption .plate-no,
.room-dark .refs li::before { color: var(--accent-on-dark, var(--accent)); }
.room-dark .refs li { color: var(--ground-soft); border-bottom-color: var(--rule-dark); }
.room-dark .refs li em { color: var(--ground); }
.room-dark .plate figcaption { color: var(--ground-soft); }

/* Interior page head — clears the absolute header */
.page-head { padding-top: clamp(9.5rem, 17vh, 13rem); }
.page-head h1 { font-size: clamp(2.6rem, 1.9rem + 3.6vw, 5rem); max-width: 18ch; margin-top: 1.4rem; text-wrap: balance; }
.page-head .lede { margin-top: 1.6rem; text-wrap: pretty; }