/* ============================================================
   economic.day — styles.css
   Retro-futuristic institutional split-screen.
   Palette: midnight-blue + two-tone warm accent (candle).
   Compliance notes: tight Sans" (Google Fonts IntersectionObserver elements `data-ledger` attribute referencing corresponding enters (threshold: IntersectionObserver-driven synchronization creates fundamentally different interaction model. acts contextual "caption track" scrolling pattern borrowed documentary filmmaking (narration footage Mono" (barely distinguishable Grotesk" (grotesque-neo 3%.
   ============================================================ */

:root {
    --c-deep-midnight: #0a1628;
    --c-midnight-field: #0d1f3a;
    --c-twilight-navy: #1a3355;
    --c-divider-blue: #2a4a7f;
    --c-steel-text: #8fa4c4;
    --c-pale-frost: #c8d6e5;
    --c-tarnished-gold: #c9a84c;
    --c-ember-glow: #8b6914;
    --c-warm-ash: #3d2a14;
    --c-flame-core: #e8d5a0;
    --c-data-blue: #5b8ab5;

    --ease-reveal: cubic-bezier(0.22, 1, 0.36, 1);

    --w-ledger: 40vw;
    --w-tape: 60vw;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    background: var(--c-deep-midnight);
    color: var(--c-steel-text);
    font-family: 'IBM Plex Sans', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.1vw, 1.125rem);
    line-height: 1.65;
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
}

/* CRT scanline overlay */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(10, 22, 40, 0.08) 2px,
        rgba(10, 22, 40, 0.08) 3px
    );
    mix-blend-mode: multiply;
}

/* ------------------------------------------------------------
   LEFT PANEL — The Ledger
   ------------------------------------------------------------ */
.ledger {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--w-ledger);
    height: 100vh;
    overflow: hidden;
    background:
        radial-gradient(ellipse 300px 400px at 15% 85%, rgba(201, 168, 76, 0.04) 0%, transparent 100%),
        radial-gradient(ellipse 60% 40% at 50% 100%, rgba(61, 42, 20, 0.05) 0%, transparent 100%),
        var(--c-deep-midnight);
    z-index: 5;
}

.ledger-inner {
    position: relative;
    width: 100%;
    height: 100%;
    padding: clamp(2rem, 4vh, 3.5rem) clamp(2rem, 3.5vw, 3.5rem);
    display: flex;
    flex-direction: column;
}

.ledger-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    color: var(--c-data-blue);
    padding-bottom: 1.25rem;
    border-bottom: 1px solid rgba(42, 74, 127, 0.35);
}

.ledger-mark {
    color: var(--c-pale-frost);
    letter-spacing: 0.28em;
    font-weight: 400;
}

.ledger-timestamp {
    color: var(--c-tarnished-gold);
}

/* Stage that holds the slides */
.ledger-stage {
    position: relative;
    flex: 1 1 auto;
    margin-top: clamp(2rem, 5vh, 3.5rem);
    overflow: hidden;
}

.ledger-slide {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    transform: translateX(-100%);
    transition: transform 800ms var(--ease-reveal);
    pointer-events: none;
    will-change: transform;
}

.ledger-slide.is-active {
    transform: translateX(0);
    pointer-events: auto;
}

.ledger-slide.is-leaving {
    transform: translateX(-100%);
    transition: transform 600ms var(--ease-reveal);
}

.ledger-index {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    color: var(--c-data-blue);
    margin-bottom: clamp(1.2rem, 3vh, 2rem);
    text-transform: uppercase;
}

.ledger-headline {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: clamp(2.6rem, 4.8vw, 4.4rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--c-pale-frost);
    margin-bottom: clamp(1.5rem, 3vh, 2.2rem);
}

.ledger-caption {
    font-family: 'IBM Plex Sans', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 300;
    font-size: clamp(0.95rem, 1vw, 1.05rem);
    line-height: 1.55;
    color: var(--c-steel-text);
    max-width: 32ch;
}

/* Candle assembly (bottom-left) */
.candle-assembly {
    position: absolute;
    left: clamp(2rem, 3.5vw, 3.5rem);
    bottom: clamp(4.5rem, 9vh, 6.5rem);
    width: 40px;
    pointer-events: none;
}

.candle-body {
    width: 18px;
    height: 58px;
    margin-left: 11px;
    background: var(--c-twilight-navy);
    border: 1px solid var(--c-divider-blue);
    border-top: none;
    position: relative;
    z-index: 2;
    box-shadow: inset 0 8px 14px rgba(0, 0, 0, 0.35);
}

.candle-body::before {
    content: "";
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(to bottom, var(--c-divider-blue), var(--c-twilight-navy));
}

.candle-flame {
    position: absolute;
    left: 0;
    bottom: 52px;
    z-index: 1;
    transform-origin: 50% 100%;
    animation: flame-scale 2.5s ease-in-out infinite alternate,
               flame-drift 3.7s ease-in-out infinite alternate;
}

.flame-outer {
    animation: flame-outer-opacity 2.9s ease-in-out infinite alternate;
    transform-origin: 50% 100%;
}

.flame-mid {
    animation: flame-mid-pulse 3.3s ease-in-out infinite alternate;
    transform-origin: 50% 100%;
}

.flame-core {
    animation: flame-core-flicker 1.9s ease-in-out infinite alternate;
    transform-origin: 50% 100%;
}

@keyframes flame-scale {
    0%   { transform: translateX(0) scaleY(0.95); }
    100% { transform: translateX(0) scaleY(1.05); }
}

@keyframes flame-drift {
    0%   { margin-left: -1px; }
    50%  { margin-left: 0.5px; }
    100% { margin-left: 1px; }
}

@keyframes flame-outer-opacity {
    0%   { opacity: 0.10; }
    100% { opacity: 0.20; }
}

@keyframes flame-mid-pulse {
    0%   { opacity: 0.42; transform: scaleY(0.97); }
    100% { opacity: 0.58; transform: scaleY(1.04); }
}

@keyframes flame-core-flicker {
    0%   { opacity: 0.82; transform: scaleY(0.94); }
    40%  { opacity: 0.95; transform: scaleY(1.03); }
    100% { opacity: 0.88; transform: scaleY(1.01); }
}

/* Footnote */
.ledger-footnote {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(42, 74, 127, 0.35);
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    color: var(--c-data-blue);
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    text-transform: uppercase;
}

.ledger-footnote-label {
    color: var(--c-data-blue);
}

.ledger-footnote-value {
    color: var(--c-tarnished-gold);
}

.ledger-footnote-sep {
    color: var(--c-divider-blue);
}

/* ------------------------------------------------------------
   DIVIDER SPINE
   ------------------------------------------------------------ */
.divider {
    position: fixed;
    left: calc(var(--w-ledger) - 0.5px);
    top: 0;
    width: 1px;
    height: 100vh;
    background: var(--c-divider-blue);
    opacity: 0.6;
    animation: divider-pulse 4s ease-in-out infinite alternate;
    z-index: 6;
    pointer-events: none;
    box-shadow: 0 0 8px rgba(42, 74, 127, 0.35);
}

@keyframes divider-pulse {
    0%   { opacity: 0.4; }
    100% { opacity: 0.7; }
}

/* ------------------------------------------------------------
   RIGHT PANEL — The Tape
   ------------------------------------------------------------ */
.tape {
    margin-left: var(--w-ledger);
    width: var(--w-tape);
    min-height: 100vh;
    background:
        repeating-linear-gradient(
            to right,
            transparent 0,
            transparent calc(8rem - 1px),
            rgba(42, 74, 127, 0.04) calc(8rem - 1px),
            rgba(42, 74, 127, 0.04) 8rem
        ),
        var(--c-midnight-field);
    position: relative;
    z-index: 3;
}

.tape-section {
    position: relative;
    min-height: 80vh;
    padding: clamp(3rem, 6vh, 5rem) clamp(2rem, 4vw, 4rem);
    border-bottom: 1px solid rgba(42, 74, 127, 0.18);
}

.tape-hero {
    min-height: 100vh;
    padding-top: clamp(4rem, 10vh, 7rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Decorative oversized numerals */
.section-ghost {
    position: absolute;
    right: clamp(1.5rem, 3vw, 3rem);
    top: clamp(1.5rem, 4vh, 3.5rem);
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: clamp(4rem, 10vw, 8rem);
    line-height: 0.9;
    letter-spacing: -0.04em;
    color: var(--c-twilight-navy);
    pointer-events: none;
    user-select: none;
    z-index: 0;
}

/* Tick marks extending from divider */
.section-tick {
    position: absolute;
    left: calc(-1 * clamp(2rem, 4vw, 4rem));
    top: clamp(3rem, 6vh, 5rem);
    width: 32px;
    height: 1px;
    background: var(--c-divider-blue);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 700ms var(--ease-reveal) 120ms;
    z-index: 2;
}

.tape-section.is-in-view .section-tick {
    transform: scaleX(1);
}

/* Reveal animation for section interiors */
.section-label,
.section-headline,
.section-body,
.section-meta,
.data-line,
.method-row,
.figure-stack,
.cadence-grid,
.apply-row,
.archive-list,
.colophon,
.specimen {
    position: relative;
    transform: translateX(-2.5rem);
    transition: transform 800ms var(--ease-reveal);
    z-index: 1;
}

.tape-section.is-in-view .section-label,
.tape-section.is-in-view .section-headline,
.tape-section.is-in-view .section-body,
.tape-section.is-in-view .section-meta,
.tape-section.is-in-view .data-line,
.tape-section.is-in-view .method-row,
.tape-section.is-in-view .figure-stack,
.tape-section.is-in-view .cadence-grid,
.tape-section.is-in-view .apply-row,
.tape-section.is-in-view .archive-list,
.tape-section.is-in-view .colophon,
.tape-section.is-in-view .specimen {
    transform: translateX(0);
}

/* Stagger delays for children */
.tape-section.is-in-view .section-label      { transition-delay: 80ms; }
.tape-section.is-in-view .section-meta       { transition-delay: 80ms; }
.tape-section.is-in-view .section-headline   { transition-delay: 180ms; }
.tape-section.is-in-view .section-body       { transition-delay: 280ms; }
.tape-section.is-in-view .section-body + .section-body { transition-delay: 360ms; }
.tape-section.is-in-view .data-line          { transition-delay: 420ms; }
.tape-section.is-in-view .method-row         { transition-delay: 360ms; }
.tape-section.is-in-view .figure-stack       { transition-delay: 360ms; }
.tape-section.is-in-view .cadence-grid       { transition-delay: 360ms; }
.tape-section.is-in-view .specimen           { transition-delay: 360ms; }
.tape-section.is-in-view .apply-row          { transition-delay: 420ms; }
.tape-section.is-in-view .archive-list       { transition-delay: 360ms; }
.tape-section.is-in-view .colophon           { transition-delay: 460ms; }

/* Section meta strip */
.section-meta {
    display: flex;
    flex-wrap: wrap;
    gap: clamp(1.2rem, 2.4vw, 2rem);
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: clamp(1.8rem, 4vh, 2.8rem);
}

.meta-kv {
    display: flex;
    gap: 0.6rem;
    align-items: baseline;
}

.kv-k {
    color: var(--c-data-blue);
}

.kv-v {
    color: var(--c-tarnished-gold);
}

.section-label {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.74rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--c-data-blue);
    margin-bottom: clamp(1.2rem, 2.8vh, 2rem);
}

.section-headline {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3.6rem);
    line-height: 1.08;
    letter-spacing: -0.02em;
    color: var(--c-pale-frost);
    margin-bottom: clamp(1.6rem, 3.2vh, 2.4rem);
    max-width: 28ch;
}

.section-body {
    max-width: 58ch;
    margin-bottom: 1.3rem;
    color: var(--c-steel-text);
}

/* Data lines (chapter 1) */
.data-line {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.82rem;
    letter-spacing: 0.05em;
    color: var(--c-data-blue);
    padding: 0.55rem 0;
    border-bottom: 1px dotted rgba(42, 74, 127, 0.35);
    max-width: 60ch;
}

.data-line-key {
    flex: 0 0 auto;
}

.data-line-dots {
    flex: 1 1 auto;
    height: 1px;
    align-self: center;
    background-image: radial-gradient(circle, var(--c-divider-blue) 0.5px, transparent 0.6px);
    background-size: 6px 1px;
    background-repeat: repeat-x;
    opacity: 0.55;
}

.data-line-val {
    color: var(--c-tarnished-gold);
    font-weight: 400;
}

/* Method cells (chapter 2) */
.method-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1rem, 2vw, 1.6rem);
    margin-top: clamp(1rem, 2.5vh, 2rem);
    max-width: 64ch;
}

.method-cell {
    position: relative;
    padding: 1.2rem 0 1rem 1.2rem;
    border-left: 1px solid var(--c-divider-blue);
}

.method-num {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.76rem;
    letter-spacing: 0.16em;
    color: var(--c-tarnished-gold);
}

.method-title {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
    color: var(--c-pale-frost);
    margin-top: 0.35rem;
    margin-bottom: 0.6rem;
    text-transform: uppercase;
}

.method-text {
    font-size: 0.92rem;
    line-height: 1.5;
    color: var(--c-steel-text);
}

/* Specimen entry (chapter 3) */
.specimen {
    margin-top: clamp(1.5rem, 3.5vh, 2.4rem);
    max-width: 64ch;
    border-top: 1px solid var(--c-divider-blue);
    border-bottom: 1px solid var(--c-divider-blue);
    padding: 1.6rem 0;
}

.specimen-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.76rem;
    letter-spacing: 0.14em;
    color: var(--c-data-blue);
    margin-bottom: 1.2rem;
    text-transform: uppercase;
}

.specimen-id {
    color: var(--c-tarnished-gold);
    letter-spacing: 0.18em;
}

.specimen-source {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.76rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--c-pale-frost);
    margin-bottom: 0.9rem;
}

.specimen-quote {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 500;
    font-size: clamp(1.1rem, 1.5vw, 1.35rem);
    line-height: 1.45;
    letter-spacing: -0.01em;
    color: var(--c-pale-frost);
    padding-left: 1.2rem;
    border-left: 2px solid var(--c-tarnished-gold);
    margin-bottom: 1.1rem;
}

.specimen-ctx {
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--c-steel-text);
    letter-spacing: 0.02em;
}

.specimen-foot {
    margin-top: 1.2rem;
    display: flex;
    gap: 0.6rem;
    align-items: baseline;
    flex-wrap: wrap;
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: var(--c-data-blue);
    text-transform: uppercase;
}

.specimen-foot-v {
    color: var(--c-tarnished-gold);
}

.specimen-foot-sep {
    color: var(--c-divider-blue);
}

/* Figures stack (chapter 4) */
.figure-stack {
    margin-top: clamp(1rem, 2.5vh, 2rem);
    max-width: 64ch;
}

.figure-row {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: baseline;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(42, 74, 127, 0.25);
}

.figure-row:first-child {
    border-top: 1px solid rgba(42, 74, 127, 0.35);
}

.figure-label {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-data-blue);
}

.figure-value {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 2.6vw, 2.4rem);
    letter-spacing: -0.02em;
    color: var(--c-tarnished-gold);
    text-align: right;
}

.figure-unit {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-weight: 400;
    font-size: 0.55em;
    color: var(--c-ember-glow);
    margin-left: 0.15em;
    letter-spacing: 0.04em;
}

.figure-source {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-data-blue);
    text-align: right;
}

/* Cadence grid (chapter 5) */
.cadence-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1rem, 2vw, 1.6rem);
    margin-top: clamp(1.2rem, 2.8vh, 2rem);
    max-width: 64ch;
}

.cadence-cell {
    padding: 1.4rem 1.2rem 1.4rem 1.2rem;
    border-left: 1px solid var(--c-divider-blue);
    border-top: 1px solid rgba(42, 74, 127, 0.3);
}

.cadence-num {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: clamp(2.4rem, 4vw, 3.6rem);
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--c-pale-frost);
}

.cadence-unit {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.45em;
    color: var(--c-tarnished-gold);
    margin-left: 0.1em;
    vertical-align: super;
    letter-spacing: 0.04em;
}

.cadence-lab {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-data-blue);
    margin-top: 0.9rem;
    line-height: 1.4;
}

/* Apply rows (chapter 7) */
.apply-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1.5rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(42, 74, 127, 0.3);
    max-width: 60ch;
}

.apply-k {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-data-blue);
}

.apply-v {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 500;
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    letter-spacing: 0.01em;
    color: var(--c-tarnished-gold);
}

/* Archive list (chapter 8) */
.archive-list {
    margin-top: clamp(1.2rem, 2.8vh, 2rem);
    max-width: 72ch;
    border-top: 1px solid rgba(42, 74, 127, 0.4);
}

.archive-item {
    display: grid;
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 0.8fr) minmax(0, 0.5fr) minmax(0, 3fr);
    gap: 1rem;
    align-items: baseline;
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(42, 74, 127, 0.22);
    transition: background-color 240ms var(--ease-reveal);
}

.archive-item:hover {
    background: linear-gradient(to right, rgba(26, 51, 85, 0.35), transparent 80%);
}

.archive-date {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    color: var(--c-tarnished-gold);
}

.archive-id {
    font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    color: var(--c-data-blue);
}

.archive-inst {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    color: var(--c-pale-frost);
}

.archive-sum {
    font-family: 'IBM Plex Sans', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 300;
    font-size: 0.92rem;
    line-height: 1.5;
    color: var(--c-steel-text);
}

/* Colophon */
.colophon {
    margin-top: clamp(2.5rem, 6vh, 4rem);
    padding-top: 1.5rem;
    border-top: 1px solid rgba(42, 74, 127, 0.35);
    max-width: 64ch;
}

.colophon-line {
    font-family: 'IBM Plex Sans', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 300;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--c-data-blue);
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.colophon-fade {
    font-family: 'Space Grotesk', Inter, Helvetica, Arial, system-ui, sans-serif;
    font-weight: 500;
    color: var(--c-tarnished-gold);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-size: 0.82rem;
    margin-top: 1.2rem;
}

/* ------------------------------------------------------------
   RESPONSIVE — below 768px: stacked layout
   ------------------------------------------------------------ */
@media (max-width: 768px) {
    :root {
        --w-ledger: 100vw;
        --w-tape: 100vw;
    }

    .ledger {
        position: relative;
        width: 100vw;
        height: auto;
        min-height: 80vh;
        border-bottom: 1px solid var(--c-divider-blue);
    }

    .ledger-inner {
        min-height: 80vh;
    }

    .ledger-stage {
        min-height: 50vh;
    }

    .ledger-slide {
        position: relative;
        transform: none;
        pointer-events: auto;
        opacity: 0;
        transition: opacity 600ms var(--ease-reveal);
    }

    .ledger-slide.is-active {
        opacity: 1;
    }

    .ledger-slide:not(.is-active) {
        display: none;
    }

    .divider {
        display: none;
    }

    .tape {
        margin-left: 0;
        width: 100vw;
    }

    .section-ghost {
        font-size: clamp(3rem, 14vw, 6rem);
    }

    .method-row,
    .cadence-grid {
        grid-template-columns: 1fr;
    }

    .figure-row {
        grid-template-columns: 1fr 1fr;
    }

    .figure-source {
        grid-column: 1 / -1;
        text-align: left;
    }

    .archive-item {
        grid-template-columns: 1fr 1fr;
    }

    .archive-sum {
        grid-column: 1 / -1;
    }

    .section-tick {
        left: 0;
        top: clamp(2rem, 4vh, 3rem);
    }

    .candle-assembly {
        bottom: clamp(3rem, 6vh, 4.5rem);
    }
}