:root {
  /* Design taxonomy token retained for compliance: Blush Interference” prism */
  --burgundy: #4B0F24;
  --velvet: #12070D;
  --ivory: #F0DFC2;
  --brass: #B88746;
  --mercury: #A8B7C7;
  --crimson: #D9364F;
  --star-blue: #273B66;
  --garamond: "EB Garamond", Georgia, serif;
  --cormorant: "Cormorant Garamond", Georgia, serif;
  --fraunces: "Fraunces", Georgia, serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; overflow: hidden; }

body {
  background: var(--velvet);
  color: var(--ivory);
  font-family: var(--garamond);
}

.observatory {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 45%, rgba(75, 15, 36, .86) 0 28%, rgba(18, 7, 13, .96) 56%, #12070D 100%),
    radial-gradient(circle at 20% 18%, rgba(39, 59, 102, .58), transparent 34%);
}

.velvet-grain, .star-field, .observatory::before, .observatory::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.velvet-grain {
  opacity: .36;
  mix-blend-mode: screen;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(240, 223, 194, .12) 0 1px, transparent 2px),
    radial-gradient(circle at 66% 71%, rgba(168, 183, 199, .10) 0 1px, transparent 2px),
    linear-gradient(115deg, transparent 0 48%, rgba(184, 135, 70, .08) 49% 51%, transparent 52%);
  background-size: 19px 23px, 29px 31px, 7px 7px;
}

.observatory::before {
  content: "";
  background: radial-gradient(circle at 50% 38%, transparent 0 48%, rgba(18, 7, 13, .84) 73%);
}

.observatory::after {
  content: "";
  inset: -20%;
  opacity: .18;
  background: conic-gradient(from 15deg, transparent, rgba(184, 135, 70, .22), transparent, rgba(168, 183, 199, .14), transparent);
  animation: slowSweep 36s linear infinite;
}

.star-field {
  opacity: .72;
  background-image:
    radial-gradient(circle at 18% 21%, #F0DFC2 0 1px, transparent 1.7px),
    radial-gradient(circle at 77% 24%, #A8B7C7 0 1px, transparent 1.5px),
    radial-gradient(circle at 62% 82%, #B88746 0 1px, transparent 1.8px),
    radial-gradient(circle at 36% 68%, #F0DFC2 0 1px, transparent 1.6px);
  background-size: 180px 190px, 230px 210px, 260px 240px, 310px 270px;
}

.chapter {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  transform: scale(.94) rotate(-1deg);
  transition: opacity .75s ease, transform .9s cubic-bezier(.2,.8,.2,1);
  pointer-events: none;
}

.chapter.is-active {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  pointer-events: auto;
}

.apparatus {
  position: relative;
  width: min(82vmin, 780px);
  height: min(82vmin, 780px);
  border-radius: 50%;
  display: grid;
  place-items: center;
  isolation: isolate;
  filter: drop-shadow(0 32px 55px rgba(0,0,0,.62));
  background:
    radial-gradient(circle at 50% 44%, rgba(240, 223, 194, .08) 0 17%, transparent 18%),
    radial-gradient(circle at 50% 50%, #4B0F24 0 44%, #12070D 61%, #050204 100%);
  box-shadow:
    inset 0 0 42px rgba(240, 223, 194, .10),
    inset 0 0 0 6px rgba(184, 135, 70, .55),
    inset 0 0 0 18px rgba(18, 7, 13, .84),
    0 0 0 2px rgba(240, 223, 194, .12);
}

.apparatus::before {
  content: "";
  position: absolute;
  inset: 4%;
  border-radius: 50%;
  background:
    repeating-conic-gradient(from 0deg, rgba(184, 135, 70, .62) 0 1deg, transparent 1deg 5deg),
    radial-gradient(circle, transparent 0 61%, rgba(168, 183, 199, .16) 62% 63%, transparent 64%);
  mask: radial-gradient(circle, transparent 0 58%, #000 59% 100%);
  animation: ringDrift 28s linear infinite;
}

.apparatus::after {
  content: "";
  position: absolute;
  inset: 10%;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255,255,255,.20), transparent 32%, rgba(168, 183, 199, .09) 50%, transparent 65%);
  box-shadow: inset -18px -28px 52px rgba(18,7,13,.56), inset 15px 18px 30px rgba(240,223,194,.06);
  z-index: 5;
}

.outer-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(184, 135, 70, .72);
  box-shadow: inset 0 0 18px rgba(184, 135, 70, .24), 0 0 16px rgba(18,7,13,.62);
}

.ring-a { inset: 7%; animation: ringDrift 41s linear infinite reverse; }
.ring-b { inset: 17%; border-color: rgba(168, 183, 199, .52); animation: ringDrift 31s linear infinite; }
.ring-c { inset: 27%; border-style: dashed; animation: ringDrift 23s linear infinite reverse; }

.calibration-band {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  animation: ringDrift 44s linear infinite;
  color: rgba(240, 223, 194, .62);
  font: 600 .68rem/1 var(--cormorant);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.calibration-band span { position: absolute; left: 50%; top: 50%; transform-origin: 0 0; }
.calibration-band span:nth-child(1) { transform: rotate(12deg) translate(0, -31vmin); }
.calibration-band span:nth-child(2) { transform: rotate(102deg) translate(0, -31vmin); }
.calibration-band span:nth-child(3) { transform: rotate(201deg) translate(0, -31vmin); }
.calibration-band span:nth-child(4) { transform: rotate(292deg) translate(0, -31vmin); }

.brass-pointer {
  position: absolute;
  width: 2px;
  height: 42%;
  top: 8%;
  left: calc(50% - 1px);
  transform-origin: 50% 100%;
  background: linear-gradient(var(--brass), transparent);
  box-shadow: 0 0 12px rgba(184, 135, 70, .72);
  z-index: 3;
}

.pointer-one { transform: rotate(24deg); }
.pointer-two { transform: rotate(-58deg); height: 37%; }

.central-plaque, .gauge-face, .ledger-paper {
  position: relative;
  z-index: 6;
  width: min(58%, 430px);
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem 2.3rem;
  color: var(--velvet);
  background:
    radial-gradient(circle at 50% 0%, rgba(255,255,255,.50), transparent 38%),
    linear-gradient(145deg, #F0DFC2, #d7bd8e 52%, #F0DFC2);
  border: 3px double rgba(75, 15, 36, .78);
  border-radius: 28px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.65), inset 0 -14px 24px rgba(75,15,36,.18), 0 12px 30px rgba(0,0,0,.38), 0 0 0 8px rgba(184, 135, 70, .28);
}

.specimen-label {
  margin: 0 0 .7rem;
  font-family: var(--cormorant);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--burgundy);
}

h1, h2 {
  margin: 0;
  font-family: var(--garamond);
  font-weight: 700;
  letter-spacing: .015em;
  color: var(--burgundy);
  text-shadow: 0 1px rgba(255,255,255,.45);
}

h1 { font-size: clamp(2.55rem, 6.4vmin, 5.6rem); line-height: .86; }
h2 { font-size: clamp(2.1rem, 5vmin, 4.4rem); line-height: .9; }

.official-subtitle, .finding {
  margin: .9rem 0 0;
  font: 500 clamp(1rem, 2vmin, 1.34rem)/1.28 var(--cormorant);
  color: #4B0F24;
}

.finding { font-style: italic; }

.wax-stamp {
  margin-top: 1rem;
  width: 132px;
  height: 54px;
  display: grid;
  place-items: center;
  color: var(--ivory);
  background: radial-gradient(circle at 35% 30%, #D9364F, #8d1a2e 65%, #4B0F24);
  border-radius: 50%;
  transform: rotate(-7deg);
  font: 700 .62rem/1.1 var(--cormorant);
  letter-spacing: .1em;
  box-shadow: inset 0 -8px 14px rgba(18,7,13,.34), 0 6px 12px rgba(75,15,36,.34);
}

.orbital-note {
  position: absolute;
  z-index: 7;
  width: 188px;
  padding: .8rem .9rem;
  color: var(--ivory);
  background: rgba(18, 7, 13, .72);
  border: 1px solid rgba(184, 135, 70, .62);
  border-radius: 14px;
  font: 600 .88rem/1.15 var(--cormorant);
  text-align: center;
  letter-spacing: .025em;
  box-shadow: inset 0 0 18px rgba(184,135,70,.12), 0 10px 24px rgba(0,0,0,.36);
  opacity: 0;
  transform: translateY(14px) scale(.94);
  transition: opacity .65s ease .25s, transform .65s ease .25s;
}

.chapter.is-active .orbital-note { opacity: 1; transform: translateY(0) scale(1); }
.note-nw { left: 1%; top: 18%; }
.note-ne { right: -1%; top: 18%; }
.note-sw { left: -1%; bottom: 18%; }
.note-se { right: 1%; bottom: 18%; }

.warning-glow {
  position: absolute;
  inset: 33%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217,54,79,.62), transparent 64%);
  opacity: .16;
  filter: blur(16px);
  animation: crimsonFlicker 3.8s ease-in-out infinite;
}

.prism-slot {
  position: absolute;
  z-index: 5;
  width: 72%;
  height: 18%;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(168,183,199,.16), transparent);
  border: 1px solid rgba(168,183,199,.28);
  transform: rotate(-18deg);
}

.blush-prism {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, transparent, rgba(168,183,199,.38), rgba(217,54,79,.62), rgba(184,135,70,.42), transparent);
  filter: blur(.4px);
  animation: prismPulse 4s ease-in-out infinite;
}

.gauge-arc {
  position: relative;
  width: min(46vmin, 320px);
  height: min(23vmin, 160px);
  margin: 1rem 0 .2rem;
  border: 10px solid rgba(75,15,36,.78);
  border-bottom: 0;
  border-radius: 320px 320px 0 0;
  background: repeating-radial-gradient(circle at 50% 100%, transparent 0 18px, rgba(75,15,36,.13) 19px 20px);
}

.needle {
  position: absolute;
  left: calc(50% - 3px);
  bottom: 0;
  width: 6px;
  height: 92%;
  background: linear-gradient(var(--crimson), var(--brass));
  border-radius: 5px;
  transform-origin: 50% 100%;
  transform: rotate(-44deg);
  box-shadow: 0 0 18px rgba(217,54,79,.62);
}

.chamber-door {
  position: absolute;
  z-index: 4;
  inset: 18%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(39,59,102,.55), rgba(18,7,13,.42) 62%, transparent 64%);
  display: grid;
  place-items: center;
  color: rgba(240,223,194,.28);
  font: 700 2rem/1.1 var(--fraunces);
  text-align: center;
}

.crossed-equation span { font-size: 1.05rem; }
.strike-thread { position: absolute; width: 62%; height: 4px; background: var(--crimson); transform: rotate(-11deg); box-shadow: 0 0 18px var(--crimson); }
.trembling-plaque.shake, .needle.shake { animation: shakeError .42s linear 1; }

.constellation-map {
  position: absolute;
  inset: 12%;
  z-index: 4;
  opacity: .82;
}

.constellation-map svg { width: 100%; height: 100%; fill: none; stroke: rgba(184,135,70,.66); stroke-width: 2; }
.constellation-map .stars circle { fill: #F0DFC2; stroke: #B88746; filter: drop-shadow(0 0 8px rgba(240,223,194,.75)); }
.ledger-paper { width: min(54%, 410px); background: linear-gradient(165deg, #F0DFC2, #dcc293 54%, #e8d5ac); }
.final-formula { margin: 1rem 0 0; color: var(--crimson); font: 700 clamp(1.4rem, 3vmin, 2rem)/1 var(--fraunces); }
.conclusion-glow { opacity: .34; }

.chapter-rail {
  position: fixed;
  z-index: 30;
  left: 2rem;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  gap: .72rem;
}

.rail-pin {
  width: 13px;
  height: 13px;
  padding: 0;
  border: 1px solid var(--brass);
  border-radius: 50%;
  background: var(--velvet);
  box-shadow: 0 0 0 5px rgba(184,135,70,.08), inset 0 0 5px rgba(240,223,194,.22);
  cursor: pointer;
}

.rail-pin span { position: absolute; left: 1.4rem; margin-top: -.25rem; color: rgba(240,223,194,.65); font: 600 .75rem var(--cormorant); letter-spacing: .1em; text-transform: uppercase; opacity: 0; transform: translateX(-6px); transition: .25s; }
.rail-pin:hover span, .rail-pin.is-active span { opacity: 1; transform: translateX(0); }
.rail-pin.is-active { background: var(--crimson); box-shadow: 0 0 18px rgba(217,54,79,.74), 0 0 0 5px rgba(184,135,70,.18); }

.advance-panel {
  position: fixed;
  z-index: 35;
  left: 50%;
  bottom: 1.8rem;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .6rem .8rem;
  border: 1px solid rgba(184,135,70,.58);
  border-radius: 999px;
  background: rgba(18,7,13,.76);
  box-shadow: inset 0 0 18px rgba(184,135,70,.12), 0 14px 28px rgba(0,0,0,.38);
}

.advance-button {
  border: 1px solid rgba(240,223,194,.28);
  border-radius: 999px;
  padding: .58rem .92rem;
  color: var(--ivory);
  background: linear-gradient(#4B0F24, #2a0916);
  font: 700 .75rem var(--cormorant);
  letter-spacing: .1em;
  text-transform: uppercase;
  cursor: pointer;
}

.chapter-caption { min-width: 150px; color: var(--mercury); text-align: center; font: 600 .9rem var(--cormorant); font-style: italic; }

@keyframes ringDrift { to { transform: rotate(360deg); } }
@keyframes slowSweep { to { transform: rotate(360deg); } }
@keyframes crimsonFlicker { 0%, 100% { opacity: .12; } 36% { opacity: .38; } 40% { opacity: .18; } 44% { opacity: .48; } 70% { opacity: .20; } }
@keyframes prismPulse { 0%, 100% { transform: translateX(-4%); opacity: .58; } 50% { transform: translateX(4%); opacity: 1; } }
@keyframes shakeError { 0%,100%{ transform: translate(0,0) rotate(0); } 18%{ transform: translate(-5px,2px) rotate(-.5deg); } 36%{ transform: translate(4px,-2px) rotate(.7deg); } 54%{ transform: translate(-3px,-1px) rotate(-.4deg); } 72%{ transform: translate(3px,1px) rotate(.4deg); } }

@media (max-width: 760px) {
  .apparatus { width: 94vmin; height: 94vmin; }
  .central-plaque, .gauge-face, .ledger-paper { width: 70%; padding: 1.35rem; min-height: 190px; }
  .orbital-note { width: 138px; font-size: .76rem; }
  .chapter-rail { left: .8rem; }
  .rail-pin span { display: none; }
  .advance-panel { width: calc(100% - 1.2rem); gap: .45rem; justify-content: center; }
  .chapter-caption { min-width: 92px; font-size: .78rem; }
  .advance-button { padding: .54rem .62rem; font-size: .65rem; }
}