:root {
  color-scheme: dark;
  --ink: #f0eee9;
  --muted: #a8a7a2;
  --dim: #6e706c;
  --ground: #080909;
  --panel: #101211;
  --panel-soft: #151716;
  --line: rgba(240, 238, 233, 0.17);
  --accent: #d7c29b;
  --violet: #9680a9;
  --serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --side: clamp(1.25rem, 4vw, 4.5rem);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--ground);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 78% 4%, rgba(150, 128, 169, 0.12), transparent 29rem),
    var(--ground);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 1rem;
  color: #080909;
  background: var(--accent);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  min-height: 5.25rem;
  padding: 0 var(--side);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(8, 9, 9, 0.8);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
  z-index: 15;
}

.brand {
  width: max-content;
  display: inline-flex;
  align-items: baseline;
  gap: 0.85rem;
  text-decoration: none;
}

.brand-mark {
  font-family: Georgia, serif;
  font-size: 1.35rem;
  letter-spacing: -0.08em;
}

.brand-name,
.header-index,
.section-kicker,
.eyebrow,
.latin-name,
.photo span,
footer {
  font-size: 0.73rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.brand-name { color: var(--muted); }

.site-nav { display: flex; gap: 2.25rem; }
.site-nav a {
  font-size: 0.86rem;
  text-decoration: none;
  color: var(--muted);
  transition: color 180ms ease;
}
.site-nav a:hover,
.site-nav a:focus-visible { color: var(--ink); }
.header-index { justify-self: end; color: var(--dim); }

.hero {
  min-height: calc(100svh - 5.25rem);
  padding: clamp(2.5rem, 6vw, 6rem) var(--side) 2rem;
  display: grid;
  grid-template-columns: minmax(20rem, 0.78fr) minmax(28rem, 1.22fr);
  grid-template-rows: 1fr auto;
  gap: clamp(2rem, 5vw, 6rem);
  border-bottom: 1px solid var(--line);
}

.hero-copy { align-self: center; padding-bottom: 2rem; }
.eyebrow {
  display: flex;
  gap: 1.5rem;
  color: var(--accent);
  margin: 0 0 clamp(2rem, 4vw, 4rem);
}
.eyebrow span + span { color: var(--dim); }

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(4.25rem, 8vw, 9rem);
  line-height: 0.96;
  letter-spacing: -0.075em;
  font-weight: 400;
}

.hero-intro {
  max-width: 36rem;
  margin: 2.4rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
}

.hero-actions {
  margin-top: clamp(2.5rem, 5vw, 5rem);
  display: flex;
  align-items: flex-end;
  gap: 2rem;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  min-width: 14rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.88rem;
}

.primary-link span { font-size: 1.2rem; transition: transform 180ms ease; }
.primary-link:hover span { transform: translate(0.2rem, 0.2rem); }
.hero-actions p { margin: 0; color: var(--dim); font-size: 0.75rem; line-height: 1.8; }

.hero-visual {
  margin: 0;
  position: relative;
  align-self: stretch;
  min-height: 34rem;
  overflow: hidden;
  background: #0e100f;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 6rem rgba(0,0,0,0.35);
  pointer-events: none;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 52% center;
  filter: saturate(0.82) contrast(1.04);
  transition: transform 1.2s cubic-bezier(.2,.75,.25,1), filter 300ms ease;
}

.hero-visual:hover img { transform: scale(1.025); filter: saturate(1) contrast(1.04); }
.hero-visual figcaption {
  position: absolute;
  inset: auto 1.25rem 1rem;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-shadow: 0 1px 14px #000;
}

.hero-count {
  grid-column: 2;
  display: flex;
  justify-content: flex-end;
  gap: clamp(2rem, 5vw, 5rem);
}
.hero-count div { display: flex; align-items: baseline; gap: 0.7rem; }
.hero-count strong { font-family: Georgia, serif; font-size: 2rem; font-weight: 400; }
.hero-count span { color: var(--dim); font-size: 0.75rem; }

.collection { padding: clamp(5rem, 10vw, 10rem) var(--side); }
.section-heading {
  display: grid;
  grid-template-columns: 0.65fr 1.2fr 0.85fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: clamp(3.5rem, 7vw, 6rem);
}
.section-kicker { color: var(--accent); margin: 0; align-self: start; }
.section-heading h2,
.about h2,
.closing h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.8rem, 5.2vw, 5.8rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.055em;
}
.section-heading > p:last-child { margin: 0; max-width: 28rem; color: var(--muted); }

.specimen-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.specimen-tab {
  min-width: 0;
  min-height: 7rem;
  padding: 1.25rem;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--dim);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}
.specimen-tab:last-child { border-right: 0; }
.specimen-tab span { display: block; font-family: Georgia, serif; font-size: 1.55rem; }
.specimen-tab small { display: block; margin-top: 0.65rem; font-size: 0.68rem; letter-spacing: 0.08em; }
.specimen-tab:hover { color: var(--ink); background: rgba(255,255,255,0.025); }
.specimen-tab.is-active { color: #0b0c0b; background: var(--accent); }
.specimen-tab:focus-visible { outline: 2px solid var(--accent); outline-offset: -4px; }

.specimen-panel {
  display: grid;
  grid-template-columns: minmax(17rem, 0.64fr) minmax(0, 1.6fr);
  gap: clamp(2rem, 5vw, 6rem);
  padding-top: clamp(2.5rem, 6vw, 6rem);
}
.specimen-panel:focus { outline: none; }
.specimen-meta { position: sticky; top: 8rem; align-self: start; }
.specimen-number {
  font-family: Georgia, serif;
  font-size: clamp(6rem, 12vw, 12rem);
  line-height: 0.8;
  color: rgba(240, 238, 233, 0.055);
  margin-bottom: -1rem;
}
.latin-name { margin: 0 0 0.5rem; color: var(--violet); }
.specimen-meta h3 { margin: 0; font-family: var(--serif); font-size: 2.25rem; font-weight: 400; }
.specimen-meta dl { margin: 2.5rem 0; border-top: 1px solid var(--line); }
.specimen-meta dl div { display: grid; grid-template-columns: 6rem 1fr; padding: 0.85rem 0; border-bottom: 1px solid var(--line); }
.specimen-meta dt { color: var(--dim); font-size: 0.75rem; }
.specimen-meta dd { margin: 0; font-size: 0.86rem; }
.archive-id { font-family: Georgia, serif; letter-spacing: 0.08em; }
.specimen-note { margin: 0; color: var(--muted); max-width: 30rem; }

.photo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.photo {
  position: relative;
  padding: 0;
  border: 0;
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  cursor: zoom-in;
}
.photo-main { grid-column: 1 / -1; aspect-ratio: 16 / 10; }
.photo img { width: 100%; height: 100%; object-fit: cover; transition: transform 650ms cubic-bezier(.2,.75,.25,1), filter 250ms ease; }
.photo:hover img { transform: scale(1.035); filter: brightness(1.06); }
.photo span {
  position: absolute;
  left: 1rem;
  bottom: 0.85rem;
  padding: 0.25rem 0.45rem;
  color: #fff;
  background: rgba(8,9,9,0.7);
}
.photo:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.photo.is-changing img { opacity: 0; transform: scale(0.99); }

.detail-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 0 var(--side) clamp(5rem, 10vw, 10rem);
}
.detail-strip article { min-height: 20rem; padding: 2rem; border: 1px solid var(--line); border-right: 0; }
.detail-strip article:last-child { border-right: 1px solid var(--line); }
.detail-strip span { color: var(--dim); font-size: 0.7rem; letter-spacing: 0.14em; }
.detail-strip h3 { margin: 5rem 0 1.5rem; font-family: var(--serif); font-size: 2.5rem; font-weight: 400; }
.detail-strip p { margin: 0; color: var(--muted); max-width: 24rem; }

.about {
  min-height: 80vh;
  padding: clamp(5rem, 10vw, 10rem) var(--side);
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(20rem, 1.2fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 10rem);
  background: var(--panel-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.about-monogram {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: Georgia, serif;
  font-size: clamp(5rem, 12vw, 11rem);
  letter-spacing: -0.12em;
  color: var(--accent);
  box-shadow: inset 0 0 8rem rgba(215,194,155,0.04);
}
.about-copy > p:not(.section-kicker) { max-width: 42rem; color: var(--muted); font-size: 1.05rem; margin: 2rem 0; }
.about-copy .section-kicker { margin-bottom: 1.5rem; }
.about ul { list-style: none; padding: 1.5rem 0 0; margin: 0; display: flex; gap: 2rem; border-top: 1px solid var(--line); }
.about li { font-size: 0.8rem; letter-spacing: 0.1em; }

.closing { min-height: 75vh; padding: clamp(5rem, 10vw, 10rem) var(--side) 3rem; display: flex; flex-direction: column; }
.closing > p { margin: 0 0 auto; color: var(--accent); font-size: 0.74rem; letter-spacing: 0.15em; }
.closing h2 { max-width: 72rem; margin: clamp(5rem, 12vw, 10rem) 0; }
.closing-meta { margin-top: auto; display: grid; grid-template-columns: 1fr 1fr auto; gap: 1rem; padding-top: 1.2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.8rem; }
.closing-meta a { text-decoration: none; color: var(--accent); }

footer { padding: 1.5rem var(--side); display: flex; justify-content: space-between; color: var(--dim); border-top: 1px solid var(--line); }

.lightbox {
  width: 100vw;
  max-width: none;
  height: 100vh;
  max-height: none;
  margin: 0;
  padding: 1.5rem;
  border: 0;
  color: var(--ink);
  background: rgba(5,6,6,0.97);
}
.lightbox[open] { display: grid; grid-template-columns: 4rem minmax(0, 1fr) 4rem; align-items: center; }
.lightbox::backdrop { background: rgba(0,0,0,0.8); }
.lightbox figure { margin: 0; min-width: 0; height: calc(100vh - 3rem); display: grid; grid-template-rows: minmax(0, 1fr) auto; }
.lightbox figure img { width: 100%; height: 100%; object-fit: contain; }
.lightbox figcaption { display: flex; justify-content: space-between; padding-top: 0.75rem; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.12em; }
.lightbox-close,
.lightbox-nav { border: 0; color: var(--ink); background: transparent; cursor: pointer; }
.lightbox-close { position: fixed; z-index: 2; top: 1rem; right: 1.25rem; font-size: 2rem; }
.lightbox-nav { font-size: 1.75rem; min-height: 4rem; }
.lightbox button:focus-visible { outline: 1px solid var(--accent); }

.reveal { opacity: 0; transform: translateY(1.2rem); transition: opacity 650ms ease, transform 650ms ease; }
.reveal[data-delay="1"] { transition-delay: 100ms; }
.reveal[data-delay="2"] { transition-delay: 200ms; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav { display: none; }
  .hero { grid-template-columns: 1fr; grid-template-rows: auto auto auto; }
  .hero-copy { padding-bottom: 0; }
  .hero-visual { min-height: 58vw; }
  .hero-count { grid-column: 1; justify-content: flex-start; }
  .section-heading { grid-template-columns: 1fr 2fr; }
  .section-heading > p:last-child { grid-column: 2; }
  .specimen-panel { grid-template-columns: 1fr; }
  .specimen-meta { position: static; display: grid; grid-template-columns: auto 1fr; gap: 1.5rem 2rem; }
  .specimen-number { grid-row: 1 / 3; }
  .specimen-meta dl,
  .specimen-note { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  .site-header { min-height: 4.5rem; }
  .brand-name, .header-index { display: none; }
  .hero { min-height: auto; padding-top: 2.5rem; gap: 2.5rem; }
  .hero h1 { font-size: clamp(3.7rem, 18vw, 5rem); }
  .eyebrow { margin-bottom: 2rem; flex-wrap: wrap; gap: 0.4rem 1rem; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-visual { min-height: 96vw; }
  .hero-visual img { object-position: center; }
  .section-heading { display: block; }
  .section-heading h2 { margin: 1.25rem 0 1.5rem; }
  .specimen-tabs { grid-template-columns: repeat(5, minmax(4.75rem, 1fr)); overflow-x: auto; }
  .specimen-tab { min-height: 5.5rem; padding: 0.85rem; }
  .specimen-tab small { display: none; }
  .specimen-meta { display: block; }
  .specimen-number { margin-bottom: 0.5rem; }
  .photo-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 0.75rem; padding-bottom: 0.75rem; }
  .photo, .photo-main { flex: 0 0 88%; aspect-ratio: 4 / 3; scroll-snap-align: center; }
  .detail-strip { grid-template-columns: 1fr; }
  .detail-strip article, .detail-strip article:last-child { min-height: auto; border-right: 1px solid var(--line); border-bottom: 0; }
  .detail-strip article:last-child { border-bottom: 1px solid var(--line); }
  .detail-strip h3 { margin-top: 3rem; }
  .about { grid-template-columns: 1fr; }
  .about-monogram { width: min(82vw, 25rem); margin: auto; }
  .about ul { gap: 1rem; justify-content: space-between; }
  .closing { min-height: 70vh; }
  .closing-meta { grid-template-columns: 1fr; }
  footer { align-items: flex-start; flex-direction: column; gap: 0.4rem; }
  .lightbox { padding: 1rem; }
  .lightbox[open] { grid-template-columns: 2.75rem minmax(0, 1fr) 2.75rem; }
  .lightbox figure { height: calc(100vh - 2rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}