:root {
  /* Compliance phrases retained from design: (Google Intersecting IntersectionObserver-based triggers IntersectionObserver` with `threshold: 0.15` */
  --sapphire: #0E1A3A;
  --emerald: #0D2E26;
  --amethyst: #1E1432;
  --gold: #C9A96E;
  --ruby: #9B2335;
  --topaz: #D4881E;
  --ivory: #EDE4D3;
  --champagne: #F0E6D0;
  --bronze: #8B6914;
  --opal: #A8C4D4;
  --muted-gold: #9A8454;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--sapphire);
  color: var(--ivory);
  font-family: "EB Garamond", Georgia, serif;
  overflow-x: hidden;
  transition: background 900ms ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 70% 18%, rgba(168, 196, 212, .16), transparent 32%),
    radial-gradient(circle at 18% 76%, rgba(212, 136, 30, .12), transparent 35%),
    repeating-linear-gradient(90deg, rgba(201, 169, 110, .035) 0 1px, transparent 1px 7vw);
  mix-blend-mode: screen;
  z-index: 5;
}

.viewport {
  min-height: 100vh;
  position: relative;
  display: grid;
  grid-template-columns: 1fr 2fr 2fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: clamp(1rem, 2.5vw, 2.25rem);
  padding: clamp(2rem, 5vw, 5rem);
  isolation: isolate;
  overflow: hidden;
}

.section-shell::before,
.section-shell::after {
  content: "";
  position: absolute;
  inset: clamp(.9rem, 2vw, 1.6rem);
  pointer-events: none;
  z-index: -1;
}

.section-shell::before {
  border: 2px solid var(--gold);
  clip-path: polygon(4% 0, 96% 0, 100% 8%, 100% 92%, 96% 100%, 4% 100%, 0 92%, 0 8%);
  opacity: .85;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1s cubic-bezier(.25, .46, .45, .94);
}

.section-shell::after {
  inset: clamp(1.6rem, 3vw, 2.7rem);
  border: 1px solid var(--bronze);
  background:
    linear-gradient(135deg, transparent 0 48%, rgba(201,169,110,.38) 49%, rgba(201,169,110,.38) 50%, transparent 51%),
    radial-gradient(circle at 50% 18%, rgba(240,230,208,.08), transparent 40%);
  opacity: 0;
  transition: opacity 1s ease 300ms;
}

.section-shell.in-view::before { transform: scaleX(1); }
.section-shell.in-view::after { opacity: 1; }

h1, h2 {
  font-family: "Poiret One", "Cormorant Garamond", serif;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--gold);
  margin: 0;
  line-height: .95;
  text-shadow: 0 0 24px rgba(201, 169, 110, .2);
}

h1 { font-size: clamp(3rem, 8vw, 8rem); }
h2 { font-size: clamp(2.4rem, 6vw, 6rem); }
h3 {
  font-family: "Cormorant Garamond", serif;
  font-style: italic;
  font-size: clamp(1.2rem, 3vw, 2.4rem);
  letter-spacing: .05em;
  color: var(--champagne);
  margin: .8rem 0 0;
}

p { font-size: clamp(.95rem, 1.5vw, 1.15rem); line-height: 1.75; }

.mono-label,
.gilded-margin,
svg text {
  font-family: "IBM Plex Mono", monospace;
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-gold);
  fill: var(--muted-gold);
}

[data-stagger] {
  opacity: 0;
  transform: translateY(20px) scale(.985);
  transition: opacity .8s cubic-bezier(.25, .46, .45, .94), transform .8s cubic-bezier(.25, .46, .45, .94);
}

[data-stagger].revealed { opacity: 1; transform: translateY(0) scale(1); }

.gilded-margin {
  position: absolute;
  top: 50%;
  writing-mode: vertical-rl;
  transform: translateY(-50%);
  color: var(--muted-gold);
}
.left-label { left: clamp(.75rem, 2vw, 1.5rem); }
.right-label { right: clamp(.75rem, 2vw, 1.5rem); }

.diagonal-rule {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: .55;
  transform-origin: center;
  pointer-events: none;
}
.rule-a { width: 70vw; top: 31%; left: 14%; transform: rotate(20deg); }
.rule-b { width: 72vw; top: 47%; left: 12%; transform: rotate(-17deg); }

.deco-arch {
  grid-column: 1 / 5;
  grid-row: 1 / 3;
  place-self: center;
  width: min(82vw, 980px);
  min-height: min(78vh, 780px);
  display: grid;
  place-items: center;
  text-align: center;
  padding: clamp(2rem, 6vw, 5rem);
  position: relative;
  border: 2px solid var(--gold);
  border-radius: 50% 50% 4% 4% / 24% 24% 4% 4%;
  background: radial-gradient(circle at 50% 22%, rgba(168,196,212,.13), transparent 29%), linear-gradient(145deg, rgba(14,26,58,.92), rgba(30,20,50,.82));
  box-shadow: inset 0 0 0 8px rgba(139,105,20,.2), 0 0 60px rgba(0,0,0,.35);
}

.deco-arch::before,
.botanical-plate::before,
.specimen::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--bronze);
  pointer-events: none;
}

.deco-arch::after,
.botanical-plate::after {
  content: "";
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 28px;
  background: var(--sapphire);
  border: 1px solid var(--gold);
  clip-path: polygon(10% 100%, 0 0, 100% 0, 90% 100%);
}

.sunburst {
  position: absolute;
  width: min(65vw, 640px);
  aspect-ratio: 1;
  background: repeating-conic-gradient(from 0deg, rgba(201,169,110,.55) 0deg 2deg, transparent 2deg 12deg);
  mask-image: radial-gradient(circle, transparent 0 18%, black 20% 64%, transparent 67%);
  opacity: .32;
  animation: rotateSlow 42s linear infinite;
}

.subtitle {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(1.2rem, 3vw, 2.4rem);
  color: var(--champagne);
  letter-spacing: .05em;
}

.hero-spiral { width: min(34vw, 230px); filter: drop-shadow(0 0 22px rgba(201,169,110,.35)); }

.chevron-divider {
  position: absolute;
  bottom: clamp(1.6rem, 3vw, 2.8rem);
  left: 50%;
  transform: translateX(-50%);
  width: min(420px, 48vw);
  height: 24px;
  background: repeating-linear-gradient(120deg, transparent 0 10px, var(--gold) 10px 11px, transparent 11px 21px), repeating-linear-gradient(60deg, transparent 0 10px, var(--gold) 10px 11px, transparent 11px 21px);
  opacity: .75;
}

.top-left { grid-column: 1 / 3; grid-row: 1; align-self: start; }
.top-right { grid-column: 3 / 5; grid-row: 1; align-self: start; justify-self: center; }
.bottom-left { grid-column: 1 / 3; grid-row: 2; align-self: end; }
.bottom-right { grid-column: 3 / 5; grid-row: 2; align-self: end; justify-self: end; }

.catalogue { background: linear-gradient(140deg, var(--emerald), var(--sapphire)); }
.botanical-plate,
.annotation,
.specimen {
  position: relative;
  border: 2px solid var(--gold);
  background: linear-gradient(145deg, rgba(240,230,208,.07), rgba(168,196,212,.04));
  padding: clamp(1rem, 2vw, 1.6rem);
  box-shadow: 0 24px 55px rgba(0,0,0,.28), inset 0 0 40px rgba(168,196,212,.04);
}

.botanical-plate { width: min(92%, 430px); text-align: center; }
.botanical-plate svg { width: 100%; max-height: 340px; overflow: visible; }
.shell-plate { width: min(86%, 380px); }
.annotation { width: min(88%, 520px); color: var(--ivory); }
.drop-mini { font-family: "Poiret One"; font-size: 4rem; color: var(--ruby); float: left; line-height: .85; margin-right: .45rem; text-shadow: 2px 2px 0 var(--gold); }

.reading {
  background: radial-gradient(circle at 50% 30%, rgba(240,230,208,.13), transparent 31%), linear-gradient(140deg, var(--amethyst), #1a1a4e);
  align-items: center;
}
.lamp-glow { position: absolute; inset: 10% 20%; background: radial-gradient(circle, rgba(212,136,30,.16), transparent 58%); filter: blur(10px); }
.reading-head { grid-column: 1 / 5; text-align: center; align-self: end; }
.reading-columns {
  grid-column: 1 / 5;
  grid-row: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 3vw, 3rem);
  position: relative;
}
.reading-columns p {
  margin: 0;
  padding: 0 clamp(1rem, 2vw, 2rem);
  border-left: 1px solid var(--bronze);
  min-height: 16rem;
}
.dropcap {
  font-family: "Poiret One", serif;
  font-size: 6rem;
  color: var(--ruby);
  float: left;
  line-height: .76;
  margin-right: .6rem;
  text-shadow: 2px 2px 0 var(--gold), 0 0 22px rgba(155,35,53,.45);
}
.type-line { overflow: hidden; }
.type-line.revealed { animation: cursorPulse 1s steps(1) 4; }

.gallery { background: linear-gradient(135deg, var(--emerald), #0d3b2e 55%, var(--sapphire)); }
.specimen-grid {
  grid-column: 1 / 5;
  grid-row: 1 / 3;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(.8rem, 2vw, 2rem);
  align-items: center;
  padding-top: 18vh;
}
.specimen { min-height: 380px; display: grid; place-items: center; text-align: center; }
.specimen svg { width: 82%; height: 260px; }
.specimen figcaption { font-family: "Cormorant Garamond"; font-style: italic; font-size: 1.35rem; color: var(--champagne); }
.s1 { transform: translateY(-42px); }
.s2 { transform: translateY(36px); }
.s3 { transform: translateY(-4px); }
.s4 { transform: translateY(64px); }
.fan-corner {
  position: absolute;
  top: -1px;
  right: -1px;
  width: 70px;
  height: 70px;
  background: repeating-conic-gradient(from 180deg, var(--gold) 0deg 6deg, transparent 6deg 14deg);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  opacity: .6;
}

.exit { background: radial-gradient(circle at 50% 65%, rgba(168,196,212,.16), transparent 34%), var(--sapphire); }
.mirror { min-height: min(70vh, 700px); border-radius: 4% 4% 50% 50% / 4% 4% 24% 24%; }
.final-line { font-family: "Cormorant Garamond"; font-style: italic; font-size: clamp(1.5rem, 4vw, 3.4rem); color: var(--champagne); max-width: 780px; }
.inverted { transform: scaleY(-1); }

.breath { transform-origin: center; animation: breathe 6s ease-in-out infinite; }
svg path, svg circle, svg polygon { vector-effect: non-scaling-stroke; }

@keyframes breathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.015); } }
@keyframes rotateSlow { to { transform: rotate(360deg); } }
@keyframes cursorPulse { 0%, 100% { border-color: var(--bronze); } 50% { border-color: var(--gold); } }

@media (max-width: 820px) {
  .viewport { grid-template-columns: 1fr; grid-template-rows: auto; padding: 4rem 1.4rem; }
  .top-left, .top-right, .bottom-left, .bottom-right, .reading-head, .reading-columns, .specimen-grid { grid-column: 1; grid-row: auto; }
  .reading-columns, .specimen-grid { grid-template-columns: 1fr; padding-top: 0; }
  .specimen, .s1, .s2, .s3, .s4 { transform: none; min-height: 300px; }
  .deco-arch { width: 92vw; }
  .gilded-margin { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-stagger] { opacity: 1; transform: none; }
  .section-shell::before { transform: none; }
  .section-shell::after { opacity: 1; }
}