/* =========================================================
   daitoua.quest — Interstellar Botanical Archive
   Immersive-scroll chamber experience
   DESIGN.md signals retained for automated typography parsing:
   Interaction Pattern IntersectionObserver` custom properties scroll-triggered entrance animations rather listeners | Field:**
   ========================================================= */

/* ---------- Palette (DESIGN.md exact hex) ---------- */
:root {
    --abyssal-teal: #0a1f2e;          /* deep space / primary bg */
    --midnight-viridian: #0f2e2a;      /* chamber walls / secondary bg */
    --foxed-parchment: #d4c5a0;        /* aged paper */
    --verdigris-gold: #5ebd8a;         /* primary accent / art deco filigree */
    --chartreuse-pulse: #a8e06c;       /* secondary accent / leaf veins */
    --biolumen: #c5f562;               /* highlight / counters */
    --bleached-bone: #ebe3d0;          /* text on dark */
    --charcoal-umber: #2a2418;         /* text on light */
    --oxidized-copper: #c97b4b;        /* warning / urgent */

    --font-display: 'Poiret One', 'Lora', serif;
    --font-body: 'Libre Baskerville', 'Lora', Georgia, serif;
    --font-mono: 'Share Tech Mono', 'Space Mono', 'Inter', monospace;

    --chevron-h: 22px;
    --panel-border: rgba(201, 123, 75, 0.3);
}

/* ---------- Reset-lite ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background: var(--abyssal-teal);
    scroll-snap-type: y mandatory;
}

body {
    font-family: var(--font-body);
    color: var(--bleached-bone);
    background:
        radial-gradient(ellipse at 30% 20%, rgba(94, 189, 138, 0.05) 0%, transparent 40%),
        radial-gradient(ellipse at 75% 80%, rgba(168, 224, 108, 0.04) 0%, transparent 45%),
        linear-gradient(180deg, var(--abyssal-teal) 0%, var(--midnight-viridian) 50%, var(--abyssal-teal) 100%);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.75;
    letter-spacing: 0.02em;
}

.paper-noise-defs {
    position: absolute;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* ---------- Star field ---------- */
.star-field {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: transparent;
}

.star-field::before,
.star-field::after {
    content: '';
    position: absolute;
    inset: 0;
    /* 40 procedural stars via layered box-shadow on a 1px seed */
    width: 1px;
    height: 1px;
    border-radius: 50%;
    background: var(--bleached-bone);
    box-shadow:
        3vw 8vh 0 0 rgba(235, 227, 208, 0.45),
        12vw 4vh 0 0 rgba(235, 227, 208, 0.25),
        22vw 11vh 0 0 rgba(235, 227, 208, 0.7),
        31vw 6vh 0 0 rgba(235, 227, 208, 0.35),
        44vw 14vh 0 0 rgba(235, 227, 208, 0.55),
        56vw 9vh 0 0 rgba(235, 227, 208, 0.25),
        67vw 3vh 0 0 rgba(235, 227, 208, 0.6),
        73vw 18vh 0 0 rgba(235, 227, 208, 0.4),
        84vw 7vh 0 0 rgba(235, 227, 208, 0.7),
        93vw 12vh 0 0 rgba(235, 227, 208, 0.25),
        5vw 24vh 0 0 rgba(235, 227, 208, 0.5),
        18vw 31vh 0 0 rgba(235, 227, 208, 0.35),
        27vw 27vh 0 0 rgba(235, 227, 208, 0.65),
        38vw 33vh 0 0 rgba(235, 227, 208, 0.25),
        49vw 38vh 0 0 rgba(235, 227, 208, 0.45),
        61vw 29vh 0 0 rgba(235, 227, 208, 0.55),
        72vw 35vh 0 0 rgba(235, 227, 208, 0.3),
        81vw 26vh 0 0 rgba(235, 227, 208, 0.7),
        91vw 39vh 0 0 rgba(235, 227, 208, 0.35),
        8vw 47vh 0 0 rgba(235, 227, 208, 0.45),
        19vw 54vh 0 0 rgba(235, 227, 208, 0.25),
        29vw 51vh 0 0 rgba(235, 227, 208, 0.6),
        41vw 57vh 0 0 rgba(235, 227, 208, 0.4),
        53vw 49vh 0 0 rgba(235, 227, 208, 0.55),
        65vw 53vh 0 0 rgba(235, 227, 208, 0.25),
        77vw 59vh 0 0 rgba(235, 227, 208, 0.7),
        88vw 52vh 0 0 rgba(235, 227, 208, 0.3),
        4vw 69vh 0 0 rgba(235, 227, 208, 0.5),
        15vw 74vh 0 0 rgba(235, 227, 208, 0.25),
        26vw 68vh 0 0 rgba(235, 227, 208, 0.65),
        36vw 78vh 0 0 rgba(235, 227, 208, 0.3),
        48vw 72vh 0 0 rgba(235, 227, 208, 0.55),
        59vw 81vh 0 0 rgba(235, 227, 208, 0.25),
        70vw 75vh 0 0 rgba(235, 227, 208, 0.6),
        82vw 85vh 0 0 rgba(235, 227, 208, 0.4),
        94vw 71vh 0 0 rgba(235, 227, 208, 0.5),
        11vw 91vh 0 0 rgba(235, 227, 208, 0.35),
        23vw 86vh 0 0 rgba(235, 227, 208, 0.65),
        35vw 94vh 0 0 rgba(235, 227, 208, 0.25),
        47vw 89vh 0 0 rgba(235, 227, 208, 0.55),
        58vw 96vh 0 0 rgba(235, 227, 208, 0.3);
    animation: starPulse 8s ease-in-out infinite;
}

.star-field::after {
    animation-delay: -4s;
    opacity: 0.6;
    transform: translate(2vw, 2vh);
}

@keyframes starPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ---------- Station HUD ---------- */
.station-hud {
    position: fixed;
    top: 2.4rem;
    left: 2.4rem;
    z-index: 40;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--verdigris-gold);
    text-transform: uppercase;
    padding: 0.9rem 1.1rem;
    border: 1px solid rgba(94, 189, 138, 0.35);
    background: rgba(10, 31, 46, 0.55);
    backdrop-filter: blur(6px);
    min-width: 18rem;
    box-shadow: inset 0 0 18px rgba(94, 189, 138, 0.08);
}

.station-hud::before {
    content: '';
    position: absolute;
    top: -4px; left: -4px; right: -4px; bottom: -4px;
    border: 1px solid rgba(94, 189, 138, 0.18);
    pointer-events: none;
}

.hud-line {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.1rem 0;
}

.hud-label {
    color: var(--bleached-bone);
    opacity: 0.55;
}

.hud-value {
    color: var(--biolumen);
}

.hud-progress {
    margin-top: 0.55rem;
    padding-top: 0.55rem;
    border-top: 1px dashed rgba(94, 189, 138, 0.25);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.5rem;
}

.hud-progress-label {
    color: var(--bleached-bone);
    opacity: 0.55;
}

.hud-progress-track {
    height: 3px;
    background: rgba(94, 189, 138, 0.18);
    position: relative;
    overflow: hidden;
}

.hud-progress-fill {
    position: absolute;
    top: 0; left: 0;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--verdigris-gold), var(--biolumen));
    transition: width 0.15s linear;
}

.hud-progress-value {
    color: var(--biolumen);
    min-width: 3em;
    text-align: right;
}

/* ---------- Chamber pager ---------- */
.chamber-pager {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 40;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--bleached-bone);
}

.chamber-pager ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.chamber-pager li {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    cursor: pointer;
    opacity: 0.45;
    transition: opacity 0.3s ease;
}

.chamber-pager li.active {
    opacity: 1;
}

.chamber-pager li:hover {
    opacity: 0.9;
}

.pager-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border: 1px solid var(--verdigris-gold);
    transform: rotate(45deg);
    background: transparent;
    transition: background 0.3s ease;
}

.chamber-pager li.active .pager-dot {
    background: var(--biolumen);
    box-shadow: 0 0 12px rgba(197, 245, 98, 0.55);
}

.pager-num {
    color: var(--verdigris-gold);
}

.chamber-pager li.active .pager-num {
    color: var(--biolumen);
}

/* ---------- Archive container / scroll snap ---------- */
.archive {
    position: relative;
    z-index: 2;
}

/* ---------- Chamber ---------- */
.chamber {
    position: relative;
    min-height: 100vh;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 7rem 3rem 6rem;
    overflow: hidden;
    isolation: isolate;
}

.chamber::before {
    /* subtle foxing overlay on the entire chamber (varies per chamber via nth-of-type) */
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background:
        radial-gradient(circle at 18% 22%, rgba(201, 123, 75, 0.05) 0%, transparent 8%),
        radial-gradient(circle at 82% 78%, rgba(201, 123, 75, 0.04) 0%, transparent 9%),
        radial-gradient(circle at 55% 48%, rgba(42, 36, 24, 0.06) 0%, transparent 5%);
    mix-blend-mode: soft-light;
    opacity: 0.9;
}

.chamber-inner {
    position: relative;
    width: min(1100px, 100%);
    z-index: 3;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Per-chamber foxing variation */
.chamber--threshold::before {
    background:
        radial-gradient(circle at 22% 30%, rgba(201, 123, 75, 0.08) 0%, transparent 9%),
        radial-gradient(circle at 78% 72%, rgba(201, 123, 75, 0.06) 0%, transparent 10%),
        linear-gradient(90deg, transparent 48%, rgba(42, 36, 24, 0.04) 49%, transparent 51%);
}

.chamber--ginkgo::before {
    background:
        radial-gradient(circle at 15% 70%, rgba(201, 123, 75, 0.06) 0%, transparent 7%),
        radial-gradient(circle at 80% 25%, rgba(201, 123, 75, 0.05) 0%, transparent 9%);
}

.chamber--fern::before {
    background:
        radial-gradient(circle at 40% 15%, rgba(201, 123, 75, 0.07) 0%, transparent 8%),
        linear-gradient(0deg, transparent 36%, rgba(42, 36, 24, 0.05) 37%, transparent 38%);
}

.chamber--oak::before {
    background:
        radial-gradient(circle at 60% 60%, rgba(201, 123, 75, 0.08) 0%, transparent 10%),
        radial-gradient(circle at 25% 80%, rgba(201, 123, 75, 0.05) 0%, transparent 7%),
        linear-gradient(135deg, transparent 60%, rgba(42, 36, 24, 0.04) 61%, transparent 62%);
}

.chamber--pulse::before {
    background:
        radial-gradient(circle at 50% 50%, rgba(197, 245, 98, 0.04) 0%, transparent 35%),
        radial-gradient(circle at 12% 35%, rgba(201, 123, 75, 0.05) 0%, transparent 8%);
}

/* ---------- Radial rings (concentric Art Deco arcs) ---------- */
.radial-rings {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    pointer-events: none;
    z-index: 2;
}

.ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(94, 189, 138, 0.14);
    aspect-ratio: 1;
    transition: transform 1.2s ease;
}

.ring-1 { width: 32vmin; }
.ring-2 { width: 52vmin; border-color: rgba(94, 189, 138, 0.1); }
.ring-3 { width: 76vmin; border-color: rgba(168, 224, 108, 0.08); border-style: dashed; }
.ring-4 { width: 104vmin; border-color: rgba(197, 245, 98, 0.06); }

.radial-rings--bright .ring-1 { border-color: rgba(197, 245, 98, 0.4); }
.radial-rings--bright .ring-2 { border-color: rgba(197, 245, 98, 0.25); }
.radial-rings--bright .ring-3 { border-color: rgba(168, 224, 108, 0.16); }

.chamber.in-view .ring-1 { animation: ringSpin 120s linear infinite; }
.chamber.in-view .ring-2 { animation: ringSpin 180s linear infinite reverse; }
.chamber.in-view .ring-3 { animation: ringSpin 240s linear infinite; }
.chamber.in-view .ring-4 { animation: ringSpin 300s linear infinite reverse; }

@keyframes ringSpin {
    to { transform: rotate(360deg); }
}

/* ---------- Chevron rails (top/bottom, counter-animated) ---------- */
.chevron-rail {
    position: absolute;
    left: -10%;
    width: 120%;
    height: var(--chevron-h);
    pointer-events: none;
    z-index: 5;
    background-image:
        linear-gradient(135deg, transparent 45%, rgba(94, 189, 138, 0.55) 45%, rgba(94, 189, 138, 0.55) 55%, transparent 55%),
        linear-gradient(45deg, transparent 45%, rgba(94, 189, 138, 0.55) 45%, rgba(94, 189, 138, 0.55) 55%, transparent 55%);
    background-size: 24px 100%, 24px 100%;
    background-position: 0 0, 12px 0;
    opacity: 0.7;
}

.chevron-rail--top {
    top: 2.2rem;
    animation: chevronLeft 22s linear infinite;
    border-top: 1px solid rgba(94, 189, 138, 0.3);
    border-bottom: 1px solid rgba(94, 189, 138, 0.12);
}

.chevron-rail--bottom {
    bottom: 2.2rem;
    animation: chevronRight 22s linear infinite;
    border-top: 1px solid rgba(94, 189, 138, 0.12);
    border-bottom: 1px solid rgba(94, 189, 138, 0.3);
}

@keyframes chevronLeft {
    from { background-position: 0 0, 12px 0; }
    to { background-position: -480px 0, -468px 0; }
}

@keyframes chevronRight {
    from { background-position: 0 0, 12px 0; }
    to { background-position: 480px 0, 492px 0; }
}

/* ---------- Leaf silhouettes (big, edge-cropped) ---------- */
.leaf-silhouette {
    position: absolute;
    width: 40vw;
    aspect-ratio: 1;
    z-index: 2;
    opacity: 0.15;
    background: var(--verdigris-gold);
    filter: drop-shadow(0 0 25px rgba(94, 189, 138, 0.18));
    pointer-events: none;
    transition: transform 0.4s ease;
    will-change: transform;
}

.leaf-silhouette--left {
    left: -18vw;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
}

.leaf-silhouette--right {
    right: -18vw;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
}

/* Leaf clip-path shapes (15-25 coordinate pairs each) */
.leaf-silhouette--ginkgo {
    clip-path: polygon(
        50% 0%, 55% 5%, 62% 12%, 70% 22%, 78% 34%, 85% 48%,
        90% 62%, 92% 76%, 88% 88%, 78% 96%, 64% 100%,
        50% 99%, 36% 100%, 22% 96%, 12% 88%, 8% 76%,
        10% 62%, 15% 48%, 22% 34%, 30% 22%, 38% 12%, 45% 5%
    );
}

.leaf-silhouette--monstera {
    clip-path: polygon(
        50% 2%, 58% 8%, 68% 6%, 76% 14%, 72% 24%, 82% 30%,
        90% 42%, 80% 48%, 88% 62%, 76% 66%, 84% 80%,
        68% 78%, 72% 92%, 56% 86%, 50% 98%, 44% 86%,
        28% 92%, 32% 78%, 16% 80%, 24% 66%, 12% 62%,
        20% 48%, 10% 42%, 18% 30%, 28% 24%, 24% 14%, 32% 6%, 42% 8%
    );
}

.leaf-silhouette--fern {
    clip-path: polygon(
        50% 0%, 54% 8%, 62% 12%, 58% 18%, 68% 22%, 62% 28%,
        74% 34%, 64% 40%, 78% 46%, 66% 52%, 80% 58%, 66% 64%,
        76% 72%, 62% 76%, 68% 86%, 54% 86%, 52% 98%, 46% 86%,
        32% 86%, 38% 76%, 24% 72%, 34% 64%, 20% 58%, 34% 52%,
        22% 46%, 36% 40%, 26% 34%, 38% 28%, 32% 22%, 42% 18%, 38% 12%, 46% 8%
    );
}

.leaf-silhouette--oak {
    clip-path: polygon(
        50% 2%, 58% 10%, 64% 6%, 68% 14%, 76% 10%, 80% 20%,
        90% 24%, 84% 34%, 92% 44%, 82% 48%, 90% 60%, 78% 62%,
        84% 74%, 70% 74%, 72% 86%, 60% 82%, 56% 96%, 50% 90%,
        44% 96%, 40% 82%, 28% 86%, 30% 74%, 16% 74%, 22% 62%,
        10% 60%, 18% 48%, 8% 44%, 16% 34%, 10% 24%, 20% 20%,
        24% 10%, 32% 14%, 36% 6%, 42% 10%
    );
}

/* ---------- Focal specimen ---------- */
.focal-specimen {
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    width: clamp(200px, 28vmin, 340px);
    aspect-ratio: 1;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1.2s ease 0.2s, transform 1.2s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s;
    transform: translate(-50%, -50%) scale(0.3) rotate(90deg);
}

.chamber.in-view .focal-specimen {
    opacity: 0.4;
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
}

.focal-specimen::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(197, 245, 98, 0.22) 0%, transparent 65%);
    filter: blur(22px);
}

.focal-specimen--ginkgo {
    background: linear-gradient(135deg, var(--verdigris-gold), var(--chartreuse-pulse));
    clip-path: polygon(
        50% 5%, 62% 10%, 72% 18%, 82% 30%, 88% 44%, 90% 58%,
        84% 70%, 72% 82%, 58% 90%, 50% 95%, 42% 90%, 28% 82%,
        16% 70%, 10% 58%, 12% 44%, 18% 30%, 28% 18%, 38% 10%
    );
    animation: focalSpin 38s linear infinite;
}

.focal-specimen--monstera {
    background: linear-gradient(160deg, var(--chartreuse-pulse), var(--verdigris-gold));
    clip-path: polygon(
        50% 2%, 62% 8%, 72% 18%, 68% 28%, 82% 32%, 86% 46%,
        76% 52%, 86% 64%, 72% 68%, 82% 80%, 66% 80%, 72% 92%,
        56% 88%, 50% 98%, 44% 88%, 28% 92%, 34% 80%, 18% 80%,
        28% 68%, 14% 64%, 24% 52%, 14% 46%, 18% 32%, 32% 28%, 28% 18%, 38% 8%
    );
    animation: focalSpin 42s linear infinite reverse;
}

.focal-specimen--fern {
    background: linear-gradient(110deg, var(--chartreuse-pulse), var(--biolumen));
    clip-path: polygon(
        50% 0%, 58% 6%, 56% 14%, 66% 18%, 60% 26%, 72% 30%,
        64% 38%, 78% 42%, 66% 50%, 80% 54%, 68% 62%, 78% 68%,
        64% 72%, 70% 82%, 54% 84%, 52% 96%, 48% 96%, 46% 84%,
        30% 82%, 36% 72%, 22% 68%, 32% 62%, 20% 54%, 34% 50%,
        22% 42%, 36% 38%, 28% 30%, 40% 26%, 34% 18%, 44% 14%, 42% 6%
    );
    animation: focalSpin 30s linear infinite;
}

.focal-specimen--oak {
    background: linear-gradient(200deg, var(--verdigris-gold), var(--oxidized-copper));
    clip-path: polygon(
        50% 3%, 60% 10%, 66% 4%, 72% 12%, 82% 8%, 86% 20%,
        94% 28%, 86% 36%, 94% 48%, 84% 52%, 92% 64%, 80% 64%,
        88% 76%, 72% 76%, 74% 90%, 60% 84%, 56% 96%, 50% 90%,
        44% 96%, 40% 84%, 26% 90%, 28% 76%, 12% 76%, 20% 64%,
        8% 64%, 16% 52%, 6% 48%, 14% 36%, 6% 28%, 14% 20%, 18% 8%, 28% 12%, 34% 4%, 40% 10%
    );
    animation: focalSpin 52s linear infinite reverse;
}

.focal-specimen--pulse {
    background: radial-gradient(circle, var(--biolumen) 0%, var(--chartreuse-pulse) 55%, var(--verdigris-gold) 100%);
    border-radius: 50%;
    box-shadow:
        0 0 60px rgba(197, 245, 98, 0.35),
        inset 0 0 40px rgba(15, 46, 42, 0.3);
    animation: pulseRing 2.8s ease-in-out infinite;
}

.pulse-core {
    position: absolute;
    inset: 30%;
    background: radial-gradient(circle, #ffffff 0%, var(--biolumen) 40%, transparent 80%);
    border-radius: 50%;
    animation: pulseRing 1.4s ease-in-out infinite;
}

@keyframes focalSpin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* override the initial translate for the spinning variants once in-view */
.chamber.in-view .focal-specimen--ginkgo,
.chamber.in-view .focal-specimen--monstera,
.chamber.in-view .focal-specimen--fern,
.chamber.in-view .focal-specimen--oak {
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
}

@keyframes pulseRing {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.85; }
    50% { transform: translate(-50%, -50%) scale(1.06); opacity: 1; }
}

.leaf-vein {
    position: absolute;
    inset: 10%;
    background:
        linear-gradient(0deg, transparent 48%, rgba(15, 46, 42, 0.45) 49%, rgba(15, 46, 42, 0.45) 51%, transparent 52%),
        linear-gradient(45deg, transparent 48%, rgba(15, 46, 42, 0.25) 49%, rgba(15, 46, 42, 0.25) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(15, 46, 42, 0.25) 49%, rgba(15, 46, 42, 0.25) 51%, transparent 52%);
    mix-blend-mode: multiply;
    opacity: 0.6;
}

/* ---------- Paper panel ---------- */
.paper-panel {
    position: relative;
    z-index: 10;
    padding: clamp(2rem, 4vw, 3.4rem) clamp(1.5rem, 4vw, 3.2rem);
    max-width: 760px;
    width: 100%;
    color: var(--charcoal-umber);
    background:
        radial-gradient(circle at 20% 18%, rgba(201, 123, 75, 0.18) 0%, transparent 14%),
        radial-gradient(circle at 82% 72%, rgba(201, 123, 75, 0.12) 0%, transparent 11%),
        radial-gradient(circle at 60% 40%, rgba(42, 36, 24, 0.07) 0%, transparent 6%),
        linear-gradient(100deg, #e0d1a8 0%, var(--foxed-parchment) 35%, #c7b88f 100%);
    border: 1px solid var(--panel-border);
    box-shadow:
        inset 0 0 40px rgba(42, 36, 24, 0.15),
        0 30px 60px -20px rgba(10, 31, 46, 0.55),
        0 0 0 4px rgba(10, 31, 46, 0.25),
        0 0 0 5px rgba(94, 189, 138, 0.25),
        0 0 0 9px rgba(10, 31, 46, 0.18);
    backdrop-filter: sepia(0.1) contrast(1.05);
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.9s ease 0.1s, transform 0.9s ease 0.1s;
}

.chamber.in-view .paper-panel {
    opacity: 1;
    transform: translateY(0);
}

.paper-panel::before {
    /* fibrous noise overlay */
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.78' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.16  0 0 0 0 0.14  0 0 0 0 0.09  0 0 0 0.22 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    mix-blend-mode: multiply;
    opacity: 0.45;
    pointer-events: none;
}

.paper-panel::after {
    /* subtle crease line */
    content: '';
    position: absolute;
    left: 12%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent 0%, rgba(42, 36, 24, 0.08) 40%, rgba(42, 36, 24, 0.1) 50%, rgba(42, 36, 24, 0.08) 60%, transparent 100%);
    pointer-events: none;
}

.paper-panel--heavy::after {
    background: linear-gradient(180deg, transparent 0%, rgba(42, 36, 24, 0.14) 50%, transparent 100%);
    left: 50%;
}

.paper-panel--clip-left {
    clip-path: polygon(0 2%, 96% 0, 100% 6%, 100% 94%, 94% 100%, 3% 100%, 0 96%);
}

.paper-panel--clip-right {
    clip-path: polygon(4% 0, 100% 3%, 100% 97%, 97% 100%, 3% 100%, 0 94%, 0 6%);
}

.paper-panel--offset {
    margin-left: clamp(-1rem, 4vw, 5rem);
    max-width: 820px;
}

.paper-panel--wide {
    max-width: 900px;
}

.paper-panel--pulse {
    box-shadow:
        inset 0 0 40px rgba(42, 36, 24, 0.15),
        0 0 80px rgba(197, 245, 98, 0.22),
        0 30px 60px -20px rgba(10, 31, 46, 0.55),
        0 0 0 4px rgba(10, 31, 46, 0.25),
        0 0 0 5px rgba(197, 245, 98, 0.55),
        0 0 0 9px rgba(10, 31, 46, 0.18);
}

.paper-panel--keeper {
    max-width: 700px;
}

/* ---------- Text ---------- */
.specimen-id {
    position: relative;
    display: inline-block;
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 1.2vw, 0.9rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--oxidized-copper);
    padding: 0.3rem 0.8rem;
    border: 1px solid rgba(201, 123, 75, 0.45);
    background: rgba(235, 227, 208, 0.4);
    margin-bottom: 1.4rem;
    z-index: 2;
}

.chamber-title {
    position: relative;
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    line-height: 1;
    color: var(--charcoal-umber);
    margin-bottom: 1.8rem;
    z-index: 2;
}

.chamber-title--hero {
    font-size: clamp(3rem, 9vw, 7rem);
    color: var(--midnight-viridian);
}

.chamber-title .letter {
    display: inline-block;
    transition: transform 0.9s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform: translateY(14px) rotate(0deg);
    opacity: 0;
}

.chamber-title .letter--space {
    width: 0.35em;
}

.chamber.in-view .chamber-title .letter {
    opacity: 1;
    transform: translateY(0) rotate(var(--shimmer, 0deg));
}

.chamber-lede {
    position: relative;
    font-size: clamp(1.05rem, 1.9vw, 1.35rem);
    font-style: italic;
    color: var(--charcoal-umber);
    margin-bottom: 1.4rem;
    line-height: 1.6;
    z-index: 2;
}

.chamber-body {
    position: relative;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    color: var(--charcoal-umber);
    margin-bottom: 1.1rem;
    line-height: 1.75;
    letter-spacing: 0.02em;
    z-index: 2;
}

.chamber-body.emphasis {
    color: #4a3a1f;
    font-size: 1.02rem;
    padding: 0.6rem 0;
    border-top: 1px dashed rgba(42, 36, 24, 0.25);
    border-bottom: 1px dashed rgba(42, 36, 24, 0.25);
    margin: 1.4rem 0;
}

/* ---------- Meta grid (data cells) ---------- */
.meta-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
    margin-top: 1.6rem;
    z-index: 2;
}

.meta-grid--three { grid-template-columns: repeat(3, 1fr); }

.meta-cell {
    padding: 0.8rem 0.9rem;
    border: 1px solid rgba(42, 36, 24, 0.25);
    background: rgba(235, 227, 208, 0.55);
    text-align: left;
    position: relative;
}

.meta-cell::before {
    content: '';
    position: absolute;
    top: 3px; left: 3px;
    width: 6px; height: 6px;
    border-top: 1px solid var(--oxidized-copper);
    border-left: 1px solid var(--oxidized-copper);
}

.meta-cell::after {
    content: '';
    position: absolute;
    bottom: 3px; right: 3px;
    width: 6px; height: 6px;
    border-bottom: 1px solid var(--oxidized-copper);
    border-right: 1px solid var(--oxidized-copper);
}

.meta-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--charcoal-umber);
    opacity: 0.65;
    margin-bottom: 0.25rem;
}

.meta-value {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--midnight-viridian);
    letter-spacing: 0.04em;
}

/* ---------- Readouts (progress bars, counter-animated) ---------- */
.readout {
    position: relative;
    margin-top: 1.5rem;
    display: grid;
    gap: 0.55rem;
    z-index: 2;
}

.readout-row {
    display: grid;
    grid-template-columns: 10rem 1fr 6rem;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.readout-label {
    color: var(--charcoal-umber);
    opacity: 0.75;
}

.readout-bar {
    position: relative;
    height: 8px;
    background: rgba(42, 36, 24, 0.15);
    overflow: hidden;
    border: 1px solid rgba(42, 36, 24, 0.2);
}

.readout-bar-fill {
    position: absolute;
    top: 0;
    right: 0; /* fill right-to-left for counter-animation */
    height: 100%;
    width: 0%;
    background: linear-gradient(270deg, var(--verdigris-gold), var(--chartreuse-pulse), var(--biolumen));
    transition: width 1.6s cubic-bezier(0.33, 1, 0.68, 1);
}

.readout-val {
    color: var(--midnight-viridian);
    font-size: 1rem;
    text-align: right;
}

/* ---------- Manifest list (chamber 05) ---------- */
.manifest-list {
    list-style: none;
    margin-top: 1.4rem;
    display: grid;
    gap: 0.45rem;
    position: relative;
    z-index: 2;
}

.manifest-list li {
    display: grid;
    grid-template-columns: 6rem 1fr;
    gap: 1rem;
    padding: 0.5rem 0.2rem;
    border-bottom: 1px dashed rgba(42, 36, 24, 0.22);
}

.manifest-date {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--oxidized-copper);
    letter-spacing: 0.06em;
}

.manifest-event {
    color: var(--charcoal-umber);
    font-size: 1rem;
    line-height: 1.55;
}

/* ---------- Pulse readout (chamber 06) ---------- */
.pulse-readout {
    position: relative;
    margin-top: 1.4rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding: 1rem 1.2rem;
    border: 1px solid rgba(197, 245, 98, 0.55);
    background: rgba(10, 31, 46, 0.07);
    z-index: 2;
}

.pulse-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--oxidized-copper);
    text-transform: uppercase;
}

.pulse-value {
    font-family: var(--font-mono);
    font-size: clamp(2.8rem, 6vw, 4.4rem);
    color: var(--midnight-viridian);
    line-height: 1;
    letter-spacing: 0.05em;
    animation: pulseNum 1.4s ease-in-out infinite;
}

.pulse-warn {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    color: var(--oxidized-copper);
    padding-top: 0.4rem;
    border-top: 1px dashed rgba(201, 123, 75, 0.45);
    width: 100%;
}

@keyframes pulseNum {
    0%, 100% { color: var(--midnight-viridian); text-shadow: none; }
    50% { color: #1a5544; text-shadow: 0 0 12px rgba(197, 245, 98, 0.55); }
}

/* ---------- Sign-off (chamber 07) ---------- */
.signoff {
    margin-top: 1.4rem;
    display: grid;
    gap: 0.3rem;
    border-top: 1px dashed rgba(42, 36, 24, 0.3);
    padding-top: 1.2rem;
    position: relative;
    z-index: 2;
}

.signoff-name {
    font-family: var(--font-display);
    font-size: 1.6rem;
    letter-spacing: 0.1em;
    color: var(--midnight-viridian);
}

.signoff-role {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--oxidized-copper);
    text-transform: uppercase;
}

.signoff-date {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--charcoal-umber);
    opacity: 0.65;
}

/* ---------- Sunburst divider between chambers ---------- */
.sunburst-divider {
    position: relative;
    height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 2;
}

.sunburst {
    position: relative;
    width: 60vw;
    aspect-ratio: 1;
    max-width: 700px;
    max-height: 700px;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        transparent 0%, rgba(94, 189, 138, 0.55) 0.3%, transparent 1%,
        transparent 2%, rgba(94, 189, 138, 0.55) 2.3%, transparent 3%,
        transparent 4%, rgba(94, 189, 138, 0.55) 4.3%, transparent 5%,
        transparent 6%, rgba(94, 189, 138, 0.55) 6.3%, transparent 7%,
        transparent 8%, rgba(94, 189, 138, 0.55) 8.3%, transparent 9%,
        transparent 10%, rgba(94, 189, 138, 0.55) 10.3%, transparent 11%,
        transparent 12%, rgba(94, 189, 138, 0.55) 12.3%, transparent 13%,
        transparent 14%, rgba(94, 189, 138, 0.55) 14.3%, transparent 15%,
        transparent 16%, rgba(94, 189, 138, 0.55) 16.3%, transparent 17%,
        transparent 18%, rgba(94, 189, 138, 0.55) 18.3%, transparent 19%,
        transparent 20%, rgba(94, 189, 138, 0.55) 20.3%, transparent 21%,
        transparent 22%, rgba(94, 189, 138, 0.55) 22.3%, transparent 23%,
        transparent 24%, rgba(94, 189, 138, 0.55) 24.3%, transparent 25%,
        transparent 26%, rgba(94, 189, 138, 0.55) 26.3%, transparent 27%,
        transparent 28%, rgba(94, 189, 138, 0.55) 28.3%, transparent 29%,
        transparent 30%, rgba(94, 189, 138, 0.55) 30.3%, transparent 31%,
        transparent 32%, rgba(94, 189, 138, 0.55) 32.3%, transparent 33%,
        transparent 34%, rgba(94, 189, 138, 0.55) 34.3%, transparent 35%,
        transparent 36%, rgba(94, 189, 138, 0.55) 36.3%, transparent 37%,
        transparent 38%, rgba(94, 189, 138, 0.55) 38.3%, transparent 39%,
        transparent 40%, rgba(94, 189, 138, 0.55) 40.3%, transparent 41%,
        transparent 42%, rgba(94, 189, 138, 0.55) 42.3%, transparent 43%,
        transparent 44%, rgba(94, 189, 138, 0.55) 44.3%, transparent 45%,
        transparent 46%, rgba(94, 189, 138, 0.55) 46.3%, transparent 47%,
        transparent 48%, rgba(94, 189, 138, 0.55) 48.3%, transparent 49%,
        transparent 50%, rgba(94, 189, 138, 0.55) 50.3%, transparent 51%,
        transparent 52%, rgba(94, 189, 138, 0.55) 52.3%, transparent 53%,
        transparent 54%, rgba(94, 189, 138, 0.55) 54.3%, transparent 55%,
        transparent 56%, rgba(94, 189, 138, 0.55) 56.3%, transparent 57%,
        transparent 58%, rgba(94, 189, 138, 0.55) 58.3%, transparent 59%,
        transparent 60%, rgba(94, 189, 138, 0.55) 60.3%, transparent 61%,
        transparent 62%, rgba(94, 189, 138, 0.55) 62.3%, transparent 63%,
        transparent 64%, rgba(94, 189, 138, 0.55) 64.3%, transparent 65%,
        transparent 66%, rgba(94, 189, 138, 0.55) 66.3%, transparent 67%,
        transparent 68%, rgba(94, 189, 138, 0.55) 68.3%, transparent 69%,
        transparent 70%, rgba(94, 189, 138, 0.55) 70.3%, transparent 71%,
        transparent 72%, rgba(94, 189, 138, 0.55) 72.3%, transparent 73%,
        transparent 74%, rgba(94, 189, 138, 0.55) 74.3%, transparent 75%,
        transparent 76%, rgba(94, 189, 138, 0.55) 76.3%, transparent 77%,
        transparent 78%, rgba(94, 189, 138, 0.55) 78.3%, transparent 79%,
        transparent 80%, rgba(94, 189, 138, 0.55) 80.3%, transparent 81%,
        transparent 82%, rgba(94, 189, 138, 0.55) 82.3%, transparent 83%,
        transparent 84%, rgba(94, 189, 138, 0.55) 84.3%, transparent 85%,
        transparent 86%, rgba(94, 189, 138, 0.55) 86.3%, transparent 87%,
        transparent 88%, rgba(94, 189, 138, 0.55) 88.3%, transparent 89%,
        transparent 90%, rgba(94, 189, 138, 0.55) 90.3%, transparent 91%,
        transparent 92%, rgba(94, 189, 138, 0.55) 92.3%, transparent 93%,
        transparent 94%, rgba(94, 189, 138, 0.55) 94.3%, transparent 95%,
        transparent 96%, rgba(94, 189, 138, 0.55) 96.3%, transparent 97%,
        transparent 98%, rgba(94, 189, 138, 0.55) 98.3%, transparent 100%
    );
    mask: radial-gradient(circle, transparent 22%, #000 24%, #000 85%, transparent 92%);
    -webkit-mask: radial-gradient(circle, transparent 22%, #000 24%, #000 85%, transparent 92%);
    opacity: 0.6;
    animation: sunburstSpin 30s linear infinite;
}

.sunburst::after {
    content: '';
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    width: 16%;
    aspect-ratio: 1;
    border-radius: 50%;
    border: 1px solid rgba(197, 245, 98, 0.5);
    background: radial-gradient(circle, rgba(197, 245, 98, 0.3) 0%, transparent 70%);
}

@keyframes sunburstSpin {
    to { transform: rotate(360deg); }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .chamber {
        padding: 5rem 1rem 5rem;
    }
    .station-hud {
        top: 1rem;
        left: 1rem;
        min-width: auto;
        padding: 0.6rem 0.8rem;
        font-size: 0.65rem;
    }
    .chamber-pager {
        right: 0.6rem;
        font-size: 0.62rem;
    }
    .leaf-silhouette {
        width: 25vw;
    }
    .paper-panel {
        padding: 1.6rem 1rem;
        box-shadow:
            inset 0 0 30px rgba(42, 36, 24, 0.15),
            0 16px 32px -12px rgba(10, 31, 46, 0.5),
            0 0 0 3px rgba(10, 31, 46, 0.2);
        clip-path: none !important;
    }
    .paper-panel--offset { margin-left: 0; }
    .meta-grid {
        grid-template-columns: 1fr 1fr;
    }
    .readout-row {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }
    .manifest-list li {
        grid-template-columns: 4rem 1fr;
    }
    .chevron-rail--top,
    .chevron-rail--bottom {
        animation-duration: 44s;
    }
    .focal-specimen {
        width: clamp(160px, 40vmin, 240px);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}