/* ===================================================================
   globaltonecheck.com — dichroic prism laboratory at the threshold of dawn
   Holographic + dreamy-ethereal scientific instrument
   =================================================================== */

:root {
    /* Palette tokens — exact hex from DESIGN.md */
    --observatory-black: #0B0E14;
    --predawn-indigo: #141A2A;
    --brushed-aluminum: #A8B5C8;
    --chromatograph-cream: #F4ECD8;
    --spectral-cyan: #7FE7E0;
    --spectral-magenta: #F0A6E0;
    --spectral-citron: #F4E27A;
    --calibration-lavender: #C8B6E2;
    --annotation-iron: #1F2735;
    --secondary-cream-1: #E8DAB5;
    --secondary-cream-2: #DCD0B4;

    /* Iridescence engine — a single rotation read by every conic gradient */
    --spectral-rotation: 0deg;

    /* Typography octave: 13 / 17 / 22 / 36 / 64 / 112 */
    --t-13: 13px;
    --t-17: 17px;
    --t-22: 22px;
    --t-36: 36px;
    --t-64: 64px;
    --t-112: 112px;

    --font-display: 'Major Mono Display', 'Courier New', monospace;
    --font-body: 'Fraunces', 'Georgia', serif;
    --font-num: 'JetBrains Mono', 'Menlo', monospace;

    --ease-instrument: cubic-bezier(0.22, 1, 0.36, 1);
    --dur-slow: 800ms;
    --dur-mid: 600ms;
    --dur-fast: 360ms;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--observatory-black);
    color: var(--brushed-aluminum);
    font-family: var(--font-body);
    font-weight: 300;
    font-size: var(--t-17);
    line-height: 1.7;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

body {
    background:
        radial-gradient(ellipse at 30% 20%, rgba(20, 26, 42, 0.65) 0%, transparent 60%),
        radial-gradient(ellipse at 75% 80%, rgba(31, 39, 53, 0.5) 0%, transparent 55%),
        var(--observatory-black);
    cursor: crosshair;
}

/* ---------- Cursor wake — 28px conic ring lagging by ~80ms ---------- */
.cursor-wake {
    position: fixed;
    top: 0;
    left: 0;
    width: 28px;
    height: 28px;
    margin: -14px 0 0 -14px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    background: conic-gradient(
        from var(--spectral-rotation),
        var(--spectral-cyan),
        var(--spectral-citron),
        var(--spectral-magenta),
        var(--calibration-lavender),
        var(--spectral-cyan)
    );
    -webkit-mask: radial-gradient(circle, transparent 0, transparent 11px, #000 12px, #000 13.5px, transparent 14px);
            mask: radial-gradient(circle, transparent 0, transparent 11px, #000 12px, #000 13.5px, transparent 14px);
    transition: width var(--dur-mid) var(--ease-instrument),
                height var(--dur-mid) var(--ease-instrument),
                margin var(--dur-mid) var(--ease-instrument);
    mix-blend-mode: screen;
    opacity: 0.85;
}
.cursor-wake.swelled {
    width: 64px;
    height: 64px;
    margin: -32px 0 0 -32px;
    -webkit-mask: radial-gradient(circle, transparent 0, transparent 28px, #000 29px, #000 31px, transparent 32px);
            mask: radial-gradient(circle, transparent 0, transparent 28px, #000 29px, #000 31px, transparent 32px);
}

@media (hover: none) {
    .cursor-wake { display: none; }
}

/* ---------- Page frame: wordmark, mode indicator, readouts ---------- */
.page-frame {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
}

.wordmark {
    position: absolute;
    top: 28px;
    left: 36px;
    font-family: var(--font-display);
    font-size: var(--t-22);
    letter-spacing: 0.18em;
    color: var(--brushed-aluminum);
    text-transform: lowercase;
    text-decoration: underline;
    text-decoration-thickness: 0.5px;
    text-underline-offset: 6px;
    pointer-events: auto;
}

.mode-indicator {
    position: absolute;
    top: 32px;
    left: 280px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.7;
    letter-spacing: 0.04em;
}

.gmt-readout {
    position: absolute;
    top: 32px;
    right: 36px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
}

.longitude-readout {
    position: absolute;
    top: 56px;
    right: 36px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--spectral-cyan);
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
    opacity: 0.85;
}

/* ---------- Hair-rules: 5°-spaced longitudinal lines ---------- */
.hair-rules {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}
.hair-rule {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--brushed-aluminum);
    opacity: 0;
    transition: opacity var(--dur-slow) var(--ease-instrument);
}
.hair-rule.visible { opacity: 0.08; }

/* ---------- Traverse: horizontal scroll spectrograph ---------- */
.traverse {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    z-index: 2;
}
.traverse-inner {
    display: flex;
    flex-direction: row;
    width: 700vw;
    height: 100vh;
    will-change: transform;
    transform: translate3d(0, 0, 0);
}

.station {
    position: relative;
    flex: 0 0 100vw;
    width: 100vw;
    height: 100vh;
    padding: 88px 80px 140px;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
    overflow: hidden;
}

/* Station-specific backgrounds */
.station-i { background: var(--observatory-black); }
.station-ii { background: var(--predawn-indigo); }
.station-iii { background: var(--observatory-black); }
.station-iv { background: var(--predawn-indigo); }
.station-v { background: var(--observatory-black); }
.station-vi { background: var(--chromatograph-cream); color: var(--annotation-iron); }
.station-vii { background: var(--observatory-black); }

/* ---------- Station meta block (numeral + coord) ---------- */
.station-meta {
    display: flex;
    align-items: baseline;
    gap: 28px;
    margin-bottom: 28px;
    z-index: 3;
}
.station-numeral {
    font-family: var(--font-display);
    font-size: var(--t-36);
    letter-spacing: 0.14em;
    color: var(--brushed-aluminum);
    transition: color var(--dur-mid) var(--ease-instrument);
}
.station-meta-dark .station-numeral { color: var(--annotation-iron); }
.station-coord {
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.7;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    text-transform: lowercase;
}
.station-meta-dark .station-coord { color: var(--annotation-iron); opacity: 0.6; }

/* ---------- Station titles with chromatic aberration ---------- */
.station-title {
    position: relative;
    font-family: var(--font-display);
    font-size: clamp(36px, 6vw, var(--t-112));
    letter-spacing: 0.14em;
    line-height: 1;
    margin: 0 0 32px;
    color: var(--brushed-aluminum);
    text-transform: uppercase;
    cursor: default;
    z-index: 4;
}
.station-title-dark { color: var(--annotation-iron); }

.station-title::before,
.station-title::after {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    pointer-events: none;
    transition: transform var(--dur-mid) var(--ease-instrument), opacity var(--dur-mid) var(--ease-instrument);
}
.station-title::before {
    color: var(--spectral-magenta);
    transform: translate(1px, 0);
    opacity: 0.4;
    mix-blend-mode: screen;
}
.station-title::after {
    color: var(--spectral-cyan);
    transform: translate(-1px, 0);
    opacity: 0.4;
    mix-blend-mode: screen;
}
.station-title:hover::before { transform: translate(3px, 0); opacity: 0.6; }
.station-title:hover::after { transform: translate(-3px, 0); opacity: 0.6; }

/* ---------- Station prose ---------- */
.station-prose {
    max-width: 56ch;
    font-size: var(--t-17);
    line-height: 1.7;
    color: var(--brushed-aluminum);
    margin: 0;
    z-index: 3;
    align-self: end;
}
.station-prose-dark { color: var(--annotation-iron); }
.station-prose-final { max-width: 64ch; }
.station-prose .lead { color: var(--calibration-lavender); font-weight: 400; }
.station-prose-dark .lead { color: var(--annotation-iron); font-style: italic; opacity: 0.8; }
.station-prose .num,
.station-foot .num {
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
}
.station-prose-dark .num { color: var(--annotation-iron); }
.station-prose .lc { font-family: var(--font-num); font-size: var(--t-13); color: var(--spectral-cyan); }
.station-prose-dark .lc { color: var(--annotation-iron); }

.tone-mention {
    position: relative;
    padding: 0 4px;
    color: var(--calibration-lavender);
    font-style: italic;
}
.tone-mention::before {
    content: '';
    position: absolute;
    inset: 2px 0;
    border-bottom: 1px solid currentColor;
    opacity: 0.4;
}

.station-foot {
    margin-top: 16px;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

/* ====================================================================
   STATION I — APERTURE
   ==================================================================== */
.aperture-stage {
    position: relative;
    width: min(64vmin, 640px);
    height: min(64vmin, 640px);
    margin: auto;
    display: grid;
    place-items: center;
    z-index: 2;
}

.aperture-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    pointer-events: none;
}
.aperture-ring-outer {
    background: conic-gradient(
        from var(--spectral-rotation),
        var(--spectral-cyan),
        var(--spectral-citron),
        var(--spectral-magenta),
        var(--calibration-lavender),
        var(--spectral-cyan)
    );
    -webkit-mask: radial-gradient(circle, transparent 0, transparent calc(50% - 2px), #000 calc(50% - 1.5px), #000 50%, transparent calc(50% + 0.5px));
            mask: radial-gradient(circle, transparent 0, transparent calc(50% - 2px), #000 calc(50% - 1.5px), #000 50%, transparent calc(50% + 0.5px));
    opacity: 0.85;
    mix-blend-mode: screen;
}
.aperture-ring-inner {
    inset: 6%;
    background: conic-gradient(
        from calc(0deg - var(--spectral-rotation)),
        var(--spectral-magenta),
        var(--calibration-lavender),
        var(--spectral-cyan),
        var(--spectral-citron),
        var(--spectral-magenta)
    );
    -webkit-mask: radial-gradient(circle, transparent 0, transparent calc(50% - 1.5px), #000 calc(50% - 1px), #000 calc(50% - 0.5px), transparent 50%);
            mask: radial-gradient(circle, transparent 0, transparent calc(50% - 1.5px), #000 calc(50% - 1px), #000 calc(50% - 0.5px), transparent 50%);
    opacity: 0.6;
    mix-blend-mode: screen;
}

.scale-ring {
    position: absolute;
    inset: 2%;
    border-radius: 50%;
    pointer-events: none;
}

.globe-wrap {
    position: relative;
    width: 86%;
    height: 86%;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: inset 0 0 60px rgba(127, 231, 224, 0.08);
}
.globe-canvas {
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 50%;
}
.terminator-halo {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    pointer-events: none;
    background:
        radial-gradient(circle at 50% 50%, transparent 47%, rgba(127, 231, 224, 0.12) 49%, transparent 51%),
        radial-gradient(circle at 50% 50%, transparent 48%, rgba(240, 166, 224, 0.08) 50%, transparent 52%);
    mix-blend-mode: screen;
}

.aperture-tick {
    position: absolute;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.6;
    font-variant-numeric: tabular-nums;
}
.aperture-tick-n { top: -28px; left: 50%; transform: translateX(-50%); }
.aperture-tick-e { top: 50%; right: -28px; transform: translateY(-50%); }
.aperture-tick-s { bottom: -28px; left: 50%; transform: translateX(-50%); }
.aperture-tick-w { top: 50%; left: -28px; transform: translateY(-50%); }

/* ====================================================================
   STATION II — DIFFRACTION BENCH
   ==================================================================== */
.bench-stage {
    position: relative;
    width: 100%;
    flex: 1;
    display: grid;
    place-items: center;
    z-index: 2;
    min-height: 0;
}
.bench-strips {
    position: relative;
    width: min(78vw, 1100px);
    height: min(58vh, 460px);
    display: grid;
    grid-template-rows: repeat(11, 1fr);
    gap: 2px;
    border-top: 1px solid rgba(168, 181, 200, 0.2);
    border-bottom: 1px solid rgba(168, 181, 200, 0.2);
    padding: 4px 0;
}
.strip {
    position: relative;
    display: grid;
    grid-template-columns: 140px 1fr 80px;
    align-items: center;
    gap: 16px;
    height: 100%;
    transition: opacity var(--dur-mid) var(--ease-instrument);
}
.strip-label {
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.7;
    text-align: right;
    padding-right: 8px;
    letter-spacing: 0.04em;
}
.strip-band {
    height: 100%;
    background: linear-gradient(
        90deg,
        var(--g1, #0B0E14) 0%,
        var(--g2, #141A2A) 16%,
        var(--g3, #1F2735) 32%,
        var(--g4, #3E4660) 48%,
        var(--g5, #7B86A6) 66%,
        var(--g6, #C8B6E2) 84%,
        var(--g7, #F4ECD8) 100%
    );
    border-left: 1px solid rgba(168, 181, 200, 0.15);
    border-right: 1px solid rgba(168, 181, 200, 0.15);
}
.strip-de {
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--calibration-lavender);
    font-variant-numeric: tabular-nums;
}
.scrub-line {
    position: absolute;
    top: -10px;
    bottom: -10px;
    left: 30%;
    width: 1px;
    background: var(--brushed-aluminum);
    opacity: 0.55;
    pointer-events: none;
    transition: left 120ms linear;
}
.scrub-caret {
    position: absolute;
    top: -7px;
    left: -7px;
}

/* ====================================================================
   STATION III — CALIBRATION CELL
   ==================================================================== */
.cell-stage {
    position: relative;
    flex: 1;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 56px;
    align-items: center;
    width: 100%;
    z-index: 2;
}
.cell-grid {
    display: grid;
    grid-template-columns: repeat(7, 56px);
    grid-template-rows: repeat(7, 56px);
    gap: 4px;
    padding: 8px;
    border: 1px solid rgba(168, 181, 200, 0.18);
}
.cell-chip {
    width: 56px;
    height: 56px;
    transition: background var(--dur-mid) var(--ease-instrument), transform var(--dur-mid) var(--ease-instrument);
}
.cell-chip:hover { transform: scale(1.04); }

.cell-slider {
    position: relative;
    width: 100%;
    max-width: 520px;
    height: 80px;
    margin-top: 32px;
}
.cell-slider-track {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(168, 181, 200, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.cell-slider-tick {
    position: relative;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.6;
    transform: translateY(-22px);
    font-variant-numeric: tabular-nums;
}
.cell-slider-tick::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 6px;
    background: var(--brushed-aluminum);
    opacity: 0.5;
}
.cell-slider-handle {
    position: absolute;
    top: 50%;
    left: 75%;
    width: 40px;
    height: 34px;
    transform: translate(-50%, -50%);
    cursor: ew-resize;
    transition: left 120ms linear;
}
.prism-glyph { display: block; }
.prism-ray { opacity: 0.7; }

.cell-margin {
    grid-column: 1 / -1;
    max-width: 64ch;
    font-family: var(--font-body);
    font-size: var(--t-17);
    line-height: 1.7;
    color: var(--brushed-aluminum);
    opacity: 0.85;
    margin: 28px 0 0;
    font-style: italic;
}
.cell-margin .lead {
    font-style: normal;
    font-family: var(--font-num);
    font-size: var(--t-13);
    letter-spacing: 0.06em;
    color: var(--spectral-cyan);
    margin-right: 8px;
    text-transform: uppercase;
}

/* ====================================================================
   STATION IV — WORLD TONE WHEEL
   ==================================================================== */
.wheel-stage {
    position: relative;
    flex: 1;
    display: grid;
    place-items: center;
    width: 100%;
    z-index: 2;
}
.tone-wheel {
    width: min(80vmin, 720px);
    height: min(80vmin, 720px);
    display: block;
    transform-origin: center;
}
.wheel-readout {
    position: absolute;
    top: 16px;
    right: 16px;
    display: grid;
    gap: 4px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    text-align: right;
    font-variant-numeric: tabular-nums;
    border-left: 1px solid rgba(168, 181, 200, 0.2);
    padding-left: 16px;
}
.wheel-slice {
    cursor: pointer;
    transition: opacity var(--dur-fast) var(--ease-instrument), stroke-width var(--dur-fast) var(--ease-instrument);
}
.wheel-slice:hover { opacity: 1; }
.wheel-slice.pinned {
    stroke: #F4ECD8;
    stroke-width: 1.5;
}

/* ====================================================================
   STATION V — DRIFT STACK
   ==================================================================== */
.drift-stage {
    position: relative;
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    align-content: center;
    width: 100%;
    z-index: 2;
}
.drift-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
    width: min(86vw, 1100px);
}
.drift-item {
    position: relative;
    display: grid;
    grid-template-columns: 28px 28px 220px 200px 1fr;
    align-items: center;
    gap: 18px;
    padding: 12px 16px;
    border: 1px solid rgba(168, 181, 200, 0.14);
    background: rgba(20, 26, 42, 0.3);
    transition: border-color var(--dur-mid) var(--ease-instrument), background var(--dur-mid) var(--ease-instrument);
}
.drift-item::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 0;
    pointer-events: none;
    background: conic-gradient(
        from var(--spectral-rotation),
        var(--spectral-cyan),
        var(--spectral-citron),
        var(--spectral-magenta),
        var(--calibration-lavender),
        var(--spectral-cyan)
    );
    -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
            mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    padding: 1px;
    opacity: 0;
    transition: opacity var(--dur-mid) var(--ease-instrument);
}
.drift-item:hover::before { opacity: 0.7; }
.drift-item:hover { background: rgba(20, 26, 42, 0.55); }

.drift-swatch {
    width: 24px;
    height: 24px;
    border: 1px solid rgba(168, 181, 200, 0.3);
}
.drift-swatch-d50 { opacity: 0.85; }
.drift-coords {
    display: flex;
    gap: 8px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    font-variant-numeric: tabular-nums;
}
.drift-place {
    font-family: var(--font-display);
    font-size: var(--t-13);
    color: var(--calibration-lavender);
    letter-spacing: 0.1em;
    text-transform: lowercase;
}
.drift-body {
    font-family: var(--font-body);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.8;
    line-height: 1.5;
    font-style: italic;
}
.drift-margin {
    max-width: 64ch;
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    opacity: 0.7;
    margin: 0;
    font-style: italic;
}

/* ====================================================================
   STATION VI — CHROMATOGRAPH PAPER
   ==================================================================== */
.chromatograph-stage {
    position: relative;
    flex: 1;
    display: grid;
    place-items: center;
    width: 100%;
    z-index: 2;
}
.chromatograph-paper {
    position: relative;
    width: min(86vw, 1200px);
    height: min(46vh, 360px);
    background:
        repeating-linear-gradient(0deg, transparent 0, transparent 39px, rgba(31, 39, 53, 0.05) 40px),
        linear-gradient(180deg, #F4ECD8, #ECE2C8);
    border: 1px solid rgba(31, 39, 53, 0.1);
    overflow: hidden;
}
.chrom-curves {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    will-change: transform;
}
.chrom-annotations {
    position: absolute;
    inset: 0;
    pointer-events: none;
    will-change: transform;
}
.chrom-anno {
    position: absolute;
    max-width: 240px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--annotation-iron);
    line-height: 1.4;
    opacity: 0.8;
    letter-spacing: 0.02em;
}
.margin-bracket {
    color: var(--annotation-iron);
    opacity: 0.5;
    font-size: 16px;
}
.chrom-anno-text {
    display: inline-block;
    padding: 0 4px;
}
.chrom-channel-labels {
    position: absolute;
    left: 12px;
    top: 12px;
    display: flex;
    flex-direction: column;
    gap: 76px;
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--annotation-iron);
    opacity: 0.7;
}

/* ====================================================================
   STATION VII — OBSERVATORY
   ==================================================================== */
.aperture-stage-final {
    width: min(54vmin, 540px);
    height: min(54vmin, 540px);
}
.final-bloom {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: radial-gradient(
        circle at 50% 50%,
        var(--final-tone, var(--calibration-lavender)) 0%,
        rgba(20, 26, 42, 0.4) 60%,
        transparent 100%
    );
    transition: background 1500ms var(--ease-instrument);
    mix-blend-mode: screen;
    opacity: 0.55;
}

.page-foot {
    margin-top: 28px;
    display: flex;
    gap: 18px;
    align-items: baseline;
    font-family: var(--font-display);
    font-size: var(--t-13);
    letter-spacing: 0.18em;
    color: var(--brushed-aluminum);
    opacity: 0.7;
    text-transform: lowercase;
    z-index: 3;
}
.foot-line { font-family: var(--font-body); font-style: italic; letter-spacing: 0; opacity: 0.85; }

/* ====================================================================
   CHROMATIC RIBBON — bottom navigator
   ==================================================================== */
.chromatic-ribbon {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 18vh;
    z-index: 50;
    pointer-events: none;
    background: linear-gradient(180deg, transparent 0%, rgba(11, 14, 20, 0.92) 36%, rgba(11, 14, 20, 0.98) 100%);
    border-top: 1px solid rgba(168, 181, 200, 0.1);
}
.station-vi ~ .chromatic-ribbon,
body.station-active-6 .chromatic-ribbon {
    background: linear-gradient(180deg, transparent 0%, rgba(244, 236, 216, 0.9) 36%, rgba(244, 236, 216, 0.98) 100%);
    border-top-color: rgba(31, 39, 53, 0.1);
}
.ribbon-track {
    position: absolute;
    top: 32%;
    left: 6%;
    right: 6%;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--observatory-black) 0%,
        var(--predawn-indigo) 12%,
        rgba(127, 231, 224, 0.4) 28%,
        var(--calibration-lavender) 44%,
        rgba(244, 226, 122, 0.6) 58%,
        var(--spectral-magenta) 72%,
        var(--predawn-indigo) 88%,
        var(--observatory-black) 100%
    );
    border-radius: 2px;
    opacity: 0.9;
    box-shadow: 0 0 12px rgba(127, 231, 224, 0.18);
}
.ribbon-marker {
    position: absolute;
    top: calc(32% - 8px);
    left: 6%;
    width: 2px;
    height: 22px;
    background: var(--brushed-aluminum);
    box-shadow: 0 0 8px var(--spectral-cyan);
    transition: left 80ms linear;
    pointer-events: none;
}
.ribbon-stations {
    position: absolute;
    top: 50%;
    left: 6%;
    right: 6%;
    display: flex;
    justify-content: space-between;
    margin: 0;
    padding: 0;
    list-style: none;
    pointer-events: auto;
}
.ribbon-stations li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding-top: 18px;
    cursor: pointer;
    transition: transform var(--dur-mid) var(--ease-instrument);
}
.ribbon-stations li::before {
    content: '';
    position: absolute;
    margin-top: -22px;
    width: 1px;
    height: 12px;
    background: var(--brushed-aluminum);
    opacity: 0.5;
}
.ribbon-stations li:hover { transform: translateY(-2px); }
.ribbon-stations .num {
    font-family: var(--font-num);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
    opacity: 0.7;
}
.ribbon-roman {
    font-family: var(--font-display);
    font-size: var(--t-13);
    color: var(--brushed-aluminum);
    letter-spacing: 0.14em;
    opacity: 0.8;
}
.ribbon-stations li.active .num,
.ribbon-stations li.active .ribbon-roman { color: var(--spectral-cyan); opacity: 1; }

/* ====================================================================
   PLUMES LAYER (drift plumes from pinned wheel slices)
   ==================================================================== */
.plumes-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 60;
    overflow: hidden;
}
.plume {
    position: absolute;
    bottom: 0;
    width: 2px;
    height: 0;
    background: linear-gradient(180deg, transparent, var(--plume-color, var(--calibration-lavender)));
    opacity: 0;
    will-change: transform, height, opacity;
    animation: plume-rise 8s var(--ease-instrument) forwards;
    box-shadow: 0 0 6px var(--plume-color, var(--calibration-lavender));
}
@keyframes plume-rise {
    0% { height: 0; opacity: 0; transform: translateX(0); }
    18% { opacity: 0.85; }
    100% { height: 80vh; opacity: 0; transform: translateX(20px); }
}

/* ====================================================================
   Reduced-motion: freeze the iridescence engine
   ==================================================================== */
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
    :root { --spectral-rotation: 0deg !important; }
    .globe-canvas { display: none; }
    .globe-wrap {
        background: radial-gradient(circle at 40% 40%, var(--calibration-lavender), var(--predawn-indigo) 70%, var(--observatory-black));
    }
}

/* ====================================================================
   Responsive — keep the instrument intact below 900px
   ==================================================================== */
@media (max-width: 900px) {
    .station { padding: 72px 28px 140px; }
    .station-title { font-size: clamp(28px, 8vw, 56px); }
    .wordmark { left: 20px; font-size: 18px; }
    .mode-indicator { display: none; }
    .gmt-readout, .longitude-readout { right: 20px; font-size: 11px; }
    .bench-strips { width: 100%; height: 50vh; }
    .strip { grid-template-columns: 90px 1fr 60px; }
    .cell-stage { grid-template-columns: 1fr; gap: 24px; }
    .cell-grid { grid-template-columns: repeat(7, 36px); grid-template-rows: repeat(7, 36px); }
    .cell-chip { width: 36px; height: 36px; }
    .drift-item { grid-template-columns: 24px 24px 1fr; gap: 12px; padding: 10px 12px; }
    .drift-coords, .drift-place, .drift-body { grid-column: 1 / -1; }
    .chromatograph-paper { height: 40vh; }
    .ribbon-stations .num { display: none; }
}