/*
  Layout: museum-first. White page, black type, photographs at full width,
  spaced-capital wayfinding labels, practical facts before description.
  Boxes take the two soap-packet colours as flat fills, with no borders:
  yellow for practical facts, navy for points of interest.
  Everything else stays black on white.
*/
:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #5e5e5c;
  --rule: #dcdcd8;
  --tint: #efefec;
  --accent: #182a42;
  --navy: #182a42;
  --on-navy: #f4f1e8;
  --navy-muted: #b9bfd6;
  --yellow: #e0c077;
  --on-yellow: #182a42;

  --sans: "Archivo", "Helvetica Neue", Arial, sans-serif;

  --step--1: 0.8125rem;
  --step-0: 1.0625rem;
  --step-1: 1.35rem;
  --step-2: clamp(1.6rem, 4.5vw, 2.2rem);
  --step-3: clamp(2.4rem, 8vw, 4.6rem);

  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111111;
    --fg: #f1f1ee;
    --muted: #a3a39e;
    --rule: #2f2f2d;
    --tint: #1c1c1b;
    --accent: #e0c077;
    --navy: #1d3350;
    --on-navy: #f4f1e8;
    --navy-muted: #a3aac6;
    --yellow: #e0c077;
    --on-yellow: #182a42;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111111;
  --fg: #f1f1ee;
  --muted: #a3a39e;
  --rule: #2f2f2d;
  --tint: #1c1c1b;
  --accent: #e0c077;
  --navy: #1d3350;
  --on-navy: #f4f1e8;
  --navy-muted: #a3aac6;
  --yellow: #e0c077;
  --on-yellow: #182a42;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 var(--step-0)/1.6 var(--sans);
  font-stretch: 100%;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-underline-offset: 0.2em; }
a:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; }

.wrap {
  max-width: 72rem;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.measure { max-width: 40rem; }

.label {
  font: 500 var(--step--1)/1.3 var(--sans);
  font-stretch: 112%;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* Header */
.masthead .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.25rem;
}
.wordmark {
  color: var(--fg);
  text-decoration: none;
  font: 500 1.375rem/1.1 "Alegreya SC", Georgia, serif;
  letter-spacing: 0.04em;
}
.masthead nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; }
.masthead nav a { color: var(--fg); text-decoration: none; }
.masthead nav a:hover { color: var(--accent); }

/* Opening statement */
.intro { padding-block: clamp(2.5rem, 8vw, 5rem) clamp(1.5rem, 4vw, 2.5rem); display: grid; gap: 1rem; }
.intro h1 {
  font: 300 var(--step-3)/1 var(--sans);
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 14ch;
  text-wrap: balance;
}
.intro p { margin: 0; color: var(--muted); }

/* Photographs */
.hero-photo { aspect-ratio: 16 / 9; }
.photos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 8px;
}
.photo {
  margin: 0;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--tint);
  position: relative;
  overflow: hidden;
}
.hero-photo.photo { aspect-ratio: 16 / 9; }
.photo img { width: 100%; height: 100%; object-fit: cover; }
.photo figcaption {
  position: absolute;
  left: 1rem;
  bottom: 0.9rem;
  color: var(--muted);
}

/* Practical facts */
.facts, .points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 10px;
}
.facts, .points { gap: 8px; }
.packet {
  background: var(--yellow);
  color: var(--navy);
  padding: 1.4rem 1.4rem 1.6rem;
  display: grid;
  gap: 0.4rem;
  align-content: start;
  min-width: 0;
}
.packet .label { color: var(--navy); }
.packet p { margin: 0; }
.packet .value { font: 300 1.6rem/1.15 var(--sans); }
.packet h3 { font: 500 var(--step-1)/1.2 var(--sans); margin: 0; }
.packet a { color: var(--navy); }
.packet.navy { background: var(--navy); color: var(--on-navy); }
.packet.navy .label, .packet.navy a { color: var(--yellow); }

/* Sections */
.section {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}
@media (min-width: 52rem) {
  .section { grid-template-columns: 14rem minmax(0, 40rem); gap: 1rem 3rem; }
  .section > .label { grid-row: 1 / span 4; padding-top: 0.6rem; }
}
.section + .section { border-top: 1px solid var(--rule); }
.section h2 {
  font: 400 var(--step-2)/1.15 var(--sans);
  letter-spacing: -0.01em;
  margin: 0;
  text-wrap: balance;
}
.section p { margin: 0; }
.section > .label { color: var(--muted); }

.score { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.25rem 1rem; }
.score strong { font: 300 var(--step-3)/1 var(--sans); }

.button {
  display: inline-block;
  justify-self: start;
  background: var(--navy);
  color: var(--on-navy);
  text-decoration: none;
  padding: 1rem 1.5rem;
}
.button:hover { filter: brightness(1.08); }

/* Guide */
.contents {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  padding: 1rem 0;
  margin: 0;
  list-style: none;
  border-bottom: 1px solid var(--rule);
}
.contents a { color: var(--fg); text-decoration: none; }
.contents a:hover { color: var(--accent); }
.guide-section {
  padding-block: 2rem;
  display: grid;
  gap: 0.75rem;
  scroll-margin-top: 1rem;
}
.guide-section + .guide-section { border-top: 1px solid var(--rule); }
.guide-section h2 { font: 400 var(--step-1)/1.2 var(--sans); margin: 0; }
.guide-section h3 { font: 600 var(--step-0)/1.3 var(--sans); margin: 0.5rem 0 0; }
.guide-section p { margin: 0; }

.todo { color: var(--muted); font-style: italic; }

.footer { border-top: 1px solid var(--fg); margin-top: 3rem; }
.footer .wrap {
  padding-block: 1.5rem 3rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  color: var(--muted);
}

/* Home page hero: full-bleed archive photographs with a slow cross-fade (hero.js) */
.masthead-over {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  color: #ffffff;
}
.masthead-over .wordmark,
.masthead-over nav a { color: #ffffff; }
.masthead-over nav a:hover { color: var(--yellow); }
.masthead-over .wrap { padding-block: 1.75rem; }
.masthead-over nav { align-items: center; }
.masthead-over .nav-book {
  border: 1px solid #ffffff;
  padding: 0.85rem 1.3rem;
}
@media (max-width: 40rem) {
  .masthead-over .nav-extra { display: none; }
  .masthead-over .wrap { flex-wrap: nowrap; padding-block: 1.25rem; }
  .masthead-over .wordmark { font-size: 1.125rem; letter-spacing: 0.02em; }
  .masthead-over .nav-book { padding: 0.75rem 1rem; }
}

.hero {
  position: relative;
  height: 88vh;
  height: 88svh;
  min-height: 34rem;
  overflow: hidden;
  background: #2c2b28;
  color: #ffffff;
}
.hero-slides, .hero-slide, .hero-shade { position: absolute; inset: 0; }
.hero-slide { opacity: 0; transition: opacity 1800ms ease; }
.hero-slide.is-active { opacity: 1; }
.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: var(--pos, 50% 50%);
  transform: scale(1);
  transform-origin: 50% 40%;
  transition: transform 0s linear 1800ms;
}
.hero.is-ready:not(.is-paused) .hero-slide.is-active img {
  transform: scale(1.06);
  transition: transform 8800ms linear;
}
/* Portrait tablets still use the landscape photographs, so steer the crop to each subject. Phones get their own crops. */
@media (orientation: portrait) and (min-width: 48.0625rem) {
  .hero-slide { --pos: 38% 50%; }
  .hero-slide-2 { --pos: 42% 50%; }
  .hero-slide-3 { --pos: 28% 50%; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-slide, .hero-slide img,
  .hero.is-ready:not(.is-paused) .hero-slide.is-active img { transition: none; transform: none; }
}

.hero-shade {
  background:
    linear-gradient(to bottom, rgba(10,10,10,0.55) 0, rgba(10,10,10,0) 12rem),
    linear-gradient(to top, rgba(10,10,10,0.82) 0%, rgba(10,10,10,0.55) 35%, rgba(10,10,10,0) 70%);
}

.hero-copy {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding-bottom: clamp(1.5rem, 5vw, 3.5rem);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem 3rem;
}
.hero-text { display: grid; gap: 1.25rem; flex: 1 1 30rem; max-width: 46rem; }
.hero-text h1 {
  margin: 0;
  font: 400 clamp(3rem, 8vw, 7rem)/0.95 "Instrument Serif", Georgia, serif;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.hero-text p { margin: 0; max-width: 34rem; }
.hero-aside { display: grid; justify-items: end; gap: 0.25rem; }
@media (max-width: 40rem) {
  .hero-aside { justify-items: start; }
}

.hero-controls { display: flex; align-items: center; gap: 4px; }
.hero-controls[hidden] { display: none; }
.hero-controls button {
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #ffffff;
  cursor: pointer;
}
.hero-bar { width: 52px; display: flex; align-items: center; }
.hero-bar span { display: block; width: 100%; height: 2px; background: rgba(224, 192, 119, 0.4); }
.hero-bar[aria-current="true"] span { background: var(--yellow); }
.hero-bar:hover span { background: var(--yellow); }
.hero-controls .hero-toggle {
  width: 44px;
  margin-left: 8px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-controls button:focus-visible { outline: 2px solid var(--yellow); outline-offset: 2px; }
.hero-toggle .icon-play { display: none; }
.hero.is-paused .hero-toggle .icon-play { display: block; }
.hero.is-paused .hero-toggle .icon-pause { display: none; }