/* ============================================================
   undo.sh — On the Reversibility of Digital Actions
   A scholarly command-line historian's monograph.
   ============================================================ */

:root {
    --bg-primary: #0A1628;
    --bg-secondary: #111D35;
    --bg-tertiary: #1B2A4A;
    --text-primary: #C8D6E5;
    --text-secondary: #7B8FAE;
    --accent-metallic: #A0B4CC;
    --accent-blue: #4A90D9;
    --accent-gold: #C9A96E;
    --grid-color: #3D5A80;
    --rule-color: #2C3E6B;
    --gutter-silver: #8A9BB0;

    --font-display: "Fraunces", "Lora", Georgia, serif;
    --font-body: "Source Serif 4", "Source Serif Pro", Georgia, serif;
    --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

    --grid-step: 4rem;
    --easing: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    background: var(--bg-primary);
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.75;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ----------------------------------------------------------------
   Page-wide grid lines (background skeleton)
   ---------------------------------------------------------------- */
.page-grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(to right, rgba(61, 90, 128, 0.12) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(61, 90, 128, 0.12) 1px, transparent 1px);
    background-size: var(--grid-step) var(--grid-step);
    background-position: 0 0;
    transition: opacity 1.6s var(--easing), background-size 3s var(--easing);
}

.grid-crosses {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle at center, rgba(61, 90, 128, 0.32) 0.5px, transparent 1.2px);
    background-size: var(--grid-step) var(--grid-step);
    background-position: 0 0;
    opacity: 0.55;
}

/* ----------------------------------------------------------------
   Masthead
   ---------------------------------------------------------------- */
.masthead {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: linear-gradient(to bottom, rgba(10, 22, 40, 0.92) 0%, rgba(10, 22, 40, 0.65) 70%, rgba(10, 22, 40, 0) 100%);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    padding: 1.25rem 2.5rem 2.25rem;
}

.masthead-inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: baseline;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.folio-mark {
    justify-self: start;
    color: var(--accent-metallic);
}

.masthead-title {
    justify-self: center;
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: none;
    color: var(--text-primary);
    font-variation-settings: "opsz" 14;
}

.masthead-pagination {
    justify-self: end;
    color: var(--text-secondary);
}

.masthead-pagination span {
    color: var(--accent-blue);
}

/* ----------------------------------------------------------------
   Codex container
   ---------------------------------------------------------------- */
.codex {
    position: relative;
    z-index: 1;
}

/* ----------------------------------------------------------------
   Section wrapper
   ---------------------------------------------------------------- */
.section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    padding: 8rem 2.5rem 6rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-divider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right,
        transparent 0%,
        var(--rule-color) 8%,
        var(--accent-metallic) 50%,
        var(--rule-color) 92%,
        transparent 100%);
    opacity: 0.85;
}

.chapter-watermark {
    position: absolute;
    top: 8rem;
    right: 4rem;
    font-family: var(--font-display);
    font-variation-settings: "opsz" 144, "wght" 900;
    font-weight: 900;
    font-size: clamp(6rem, 12vw, 11rem);
    color: var(--text-secondary);
    opacity: 0.08;
    line-height: 0.9;
    letter-spacing: -0.04em;
    pointer-events: none;
    user-select: none;
    z-index: 1;
}

.section-grid {
    display: grid;
    grid-template-columns: 1fr minmax(0, 680px) minmax(0, 340px) 1fr;
    column-gap: 4rem;
    width: 100%;
    position: relative;
    z-index: 2;
}

.primary-column {
    grid-column: 2;
}

.primary-column-wide {
    grid-column: 2 / 4;
    max-width: 880px;
}

.margin-column {
    grid-column: 3;
    padding-top: 1rem;
    border-left: 1px solid color-mix(in srgb, #8A9BB0 25%, transparent);
    padding-left: 2rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

/* ----------------------------------------------------------------
   Section eyebrow + headings
   ---------------------------------------------------------------- */
.section-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent-metallic);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.eyebrow-centered {
    justify-content: center;
    width: 100%;
}

.eyebrow-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(74, 144, 217, 0.6);
}

.section-heading {
    font-family: var(--font-display);
    font-variation-settings: "opsz" 144, "wght" 700;
    font-weight: 700;
    font-size: clamp(2.25rem, 4.2vw, 3.6rem);
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    transition: font-variation-settings 400ms var(--easing);
}

.section-heading em {
    font-style: italic;
    color: var(--accent-metallic);
    font-variation-settings: "opsz" 144, "wght" 500;
}

.section-heading:hover {
    font-variation-settings: "opsz" 144, "wght" 800;
}

.lede,
.lede-small,
.primary-column p {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 1.125rem;
    line-height: 1.75;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    max-width: 62ch;
}

.lede-small {
    font-size: 1.0625rem;
}

.primary-column em {
    font-style: italic;
    color: var(--accent-metallic);
    font-weight: 400;
}

/* ----------------------------------------------------------------
   Inline code
   ---------------------------------------------------------------- */
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--accent-blue);
    background: var(--bg-tertiary);
    padding: 0.1em 0.4em;
    border-left: 1px solid var(--text-secondary);
    border-radius: 1px;
}

/* ----------------------------------------------------------------
   Drop cap
   ---------------------------------------------------------------- */
.dropcap {
    font-family: var(--font-display);
    font-variation-settings: "opsz" 144, "wght" 800;
    font-weight: 800;
    float: left;
    font-size: 4.2rem;
    line-height: 0.9;
    padding: 0.5rem 0.75rem 0 0;
    color: var(--accent-gold);
    margin-top: 0.15rem;
}

/* ----------------------------------------------------------------
   HERO
   ---------------------------------------------------------------- */
.section-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
}

.section-hero .section-divider {
    opacity: 0;
}

.hero-grid-convergence {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(to right, rgba(74, 144, 217, 0.18) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(74, 144, 217, 0.18) 1px, transparent 1px);
    background-size: 5rem 5rem;
    background-position: center center;
    animation: grid-converge 3s var(--easing) forwards, grid-breathe 4s var(--easing) 3s infinite;
    transform-origin: center center;
    mask-image: radial-gradient(ellipse 70% 60% at center, black 0%, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at center, black 0%, black 30%, transparent 80%);
}

@keyframes grid-converge {
    0%   { background-size: 7rem 7rem; opacity: 0.0; }
    20%  { opacity: 0.85; }
    100% { background-size: 4.9rem 4.9rem; opacity: 0.45; }
}

@keyframes grid-breathe {
    0%, 100% { transform: scale(1.0); }
    50%      { transform: scale(1.02); }
}

.hero-frame {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    text-align: center;
    padding: 0 2rem;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-meta-item {
    position: relative;
}

.hero-meta-item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -1.25rem;
    top: 50%;
    width: 4px;
    height: 4px;
    background: var(--accent-metallic);
    transform: translateY(-50%) rotate(45deg);
    opacity: 0.7;
}

.hero-title {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: clamp(3rem, 11vw, 9rem);
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 2.5rem;
    position: relative;
}

.hero-title-mono {
    display: inline-block;
    position: relative;
    padding: 0.2em 0.4em;
}

.hero-title-mono::before,
.hero-title-mono::after {
    content: "";
    position: absolute;
    width: 1.4em;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--accent-metallic), transparent);
    left: 50%;
    transform: translateX(-50%);
}

.hero-title-mono::before { top: -0.3em; }
.hero-title-mono::after  { bottom: -0.3em; }

.hero-dot {
    color: var(--accent-blue);
    display: inline-block;
    transform: translateY(-0.05em);
}

.hero-sh {
    color: var(--accent-gold);
    font-style: normal;
    text-shadow: 0 0 30px rgba(201, 169, 110, 0.35);
}

.hero-subtitle {
    font-family: var(--font-display);
    font-variation-settings: "opsz" 24, "wght" 400;
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1rem, 1.6vw, 1.35rem);
    line-height: 1.55;
    color: var(--text-secondary);
    max-width: 56ch;
    margin: 0 auto 3rem;
}

.hero-subtitle em {
    color: var(--accent-metallic);
    font-style: italic;
    font-variation-settings: "opsz" 24, "wght" 600;
}

.hero-coordinates {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4rem;
}

.coord {
    letter-spacing: 0.08em;
}

.coord-val {
    color: var(--accent-blue);
    margin-left: 0.25em;
}

.hero-scroll-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-secondary);
    opacity: 0.7;
    animation: hint-fade 3s var(--easing) infinite;
}

.scroll-hint-rule {
    width: 4rem;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--accent-metallic), transparent);
}

@keyframes hint-fade {
    0%, 100% { opacity: 0.4; }
    50%      { opacity: 0.85; }
}

/* ----------------------------------------------------------------
   THESIS — margin column
   ---------------------------------------------------------------- */
.margin-block {
    font-family: var(--font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.margin-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent-metallic);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(138, 155, 176, 0.2);
}

.margin-text {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 0.85rem;
}

.margin-text-quiet {
    font-style: italic;
    color: var(--text-secondary);
    opacity: 0.85;
    font-family: var(--font-display);
    font-variation-settings: "opsz" 24, "wght" 400;
}

.margin-text em {
    color: var(--accent-metallic);
    font-style: italic;
}

.margin-text code {
    font-size: 0.78em;
}

.margin-strong {
    color: var(--accent-metallic);
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 600;
    font-variation-settings: "opsz" 24, "wght" 600;
}

.margin-sup {
    color: var(--accent-blue);
    font-family: var(--font-mono);
    font-size: 0.75em;
    margin-right: 0.35em;
}

.kbd-gold {
    color: var(--accent-gold);
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: rgba(201, 169, 110, 0.08);
    padding: 0 0.3em;
    border-left: 1px solid var(--accent-gold);
}

/* ----------------------------------------------------------------
   Reversal Timeline (SVG in margin column)
   ---------------------------------------------------------------- */
.reversal-timeline {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 1rem;
    background: rgba(27, 42, 74, 0.4);
    padding: 0.5rem 0;
    border-top: 1px solid rgba(138, 155, 176, 0.12);
    border-bottom: 1px solid rgba(138, 155, 176, 0.12);
}

.timeline-events circle {
    transition: r 0.8s var(--easing), opacity 0.8s var(--easing), fill 0.8s var(--easing);
}

.timeline-events circle.undone {
    r: 0.5;
    fill: var(--grid-color);
    opacity: 0.3;
}

/* Ghost trail rendered around an undone node */
.timeline-events .ghost {
    fill: none;
    stroke: var(--grid-color);
    stroke-width: 0.4;
    stroke-dasharray: 1 1.5;
    opacity: 0;
    transition: opacity 0.8s var(--easing);
}

.timeline-events .ghost.visible { opacity: 0.6; }

/* ----------------------------------------------------------------
   EVIDENCE — scatter canvas
   ---------------------------------------------------------------- */
.section-evidence {
    padding-bottom: 4rem;
}

.evidence-canvas-frame {
    position: relative;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    margin-top: 4rem;
    height: clamp(380px, 55vh, 560px);
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-top: 1px solid rgba(160, 180, 204, 0.18);
    border-bottom: 1px solid rgba(160, 180, 204, 0.18);
    overflow: hidden;
    z-index: 2;
}

.canvas-corner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 1px solid var(--accent-metallic);
    opacity: 0.7;
    z-index: 3;
}

.corner-tl { top: 16px; left: 16px; border-right: none; border-bottom: none; }
.corner-tr { top: 16px; right: 16px; border-left: none; border-bottom: none; }
.corner-bl { bottom: 16px; left: 16px; border-right: none; border-top: none; }
.corner-br { bottom: 16px; right: 16px; border-left: none; border-top: none; }

.scatter-field {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.scatter-field circle {
    transition: opacity 1.2s var(--easing), r 1.2s var(--easing), cx 1.2s var(--easing), cy 1.2s var(--easing);
}

.canvas-caption {
    position: absolute;
    bottom: 1.25rem;
    left: 2.5rem;
    right: 2.5rem;
    display: flex;
    align-items: baseline;
    gap: 1.25rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-secondary);
    z-index: 4;
}

.caption-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent-metallic);
    flex-shrink: 0;
    padding-right: 1rem;
    border-right: 1px solid rgba(138, 155, 176, 0.3);
}

.caption-text em {
    color: var(--accent-metallic);
    font-style: italic;
}

/* ----------------------------------------------------------------
   METHOD — stanzas + code blocks
   ---------------------------------------------------------------- */
.method-stanza {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: 1.5rem;
    align-items: baseline;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(138, 155, 176, 0.1);
}

.method-stanza:last-child {
    border-bottom: none;
}

.stanza-number {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-variation-settings: "opsz" 24, "wght" 400;
    font-size: 1.4rem;
    color: var(--accent-gold);
    text-align: right;
    padding-top: 0.1rem;
}

.method-stanza p {
    margin-bottom: 0;
    font-size: 1.0625rem;
    line-height: 1.75;
}

.code-block {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.7;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 1rem 1.25rem;
    border-left: 2px solid var(--accent-blue);
    overflow-x: auto;
    margin-top: 0.5rem;
}

.code-block code {
    background: transparent;
    padding: 0;
    border: none;
    font-size: inherit;
    color: inherit;
    display: block;
    white-space: pre;
}

.code-comment { color: var(--text-secondary); font-style: italic; }
.code-prompt  { color: var(--accent-gold); user-select: none; padding-right: 0.5em; }

/* ----------------------------------------------------------------
   CONCLUSION
   ---------------------------------------------------------------- */
.section-conclusion {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.conclusion-frame {
    position: relative;
    z-index: 2;
    max-width: 880px;
    text-align: center;
    padding: 0 2rem;
}

.conclusion-line {
    font-family: var(--font-display);
    font-variation-settings: "opsz" 144, "wght" 400;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.6rem, 3.2vw, 2.6rem);
    line-height: 1.4;
    letter-spacing: -0.005em;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 2.5rem;
}

.conclusion-line .char {
    display: inline-block;
    transition: opacity 0.6s var(--easing), transform 0.6s var(--easing), filter 0.6s var(--easing);
}

.conclusion-line .char.undone {
    opacity: 0.05;
    transform: translateY(-0.2em);
    filter: blur(2px);
}

.conclusion-attribution {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-style: italic;
}

.conclusion-rule {
    width: 80px;
    height: 1px;
    margin: 3rem auto;
    background: linear-gradient(to right, transparent, var(--accent-metallic), transparent);
}

.conclusion-coords {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
}

/* ----------------------------------------------------------------
   COLOPHON
   ---------------------------------------------------------------- */
.colophon {
    position: relative;
    background: var(--bg-secondary);
    padding: 6rem 2.5rem 5rem;
    border-top: 1px solid rgba(138, 155, 176, 0.12);
}

.colophon-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.colophon-block p {
    font-family: var(--font-body);
    font-size: 0.92rem;
    line-height: 1.7;
    color: var(--text-secondary);
    font-weight: 300;
}

.colophon-block em {
    color: var(--accent-metallic);
    font-style: italic;
    font-family: var(--font-display);
    font-variation-settings: "opsz" 24, "wght" 500;
}

.colophon-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--accent-metallic);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(138, 155, 176, 0.18);
}

.mono-inline {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-primary);
}

.muted {
    color: var(--text-secondary);
    opacity: 0.6;
    text-decoration: line-through;
    text-decoration-color: rgba(123, 143, 174, 0.4);
}

/* ----------------------------------------------------------------
   Skeleton-loading state
   ---------------------------------------------------------------- */
.section[data-skeleton] {
    --skeleton-grid-opacity: 0.4;
}

.section[data-skeleton]::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(to right, rgba(61, 90, 128, var(--skeleton-grid-opacity)) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(61, 90, 128, var(--skeleton-grid-opacity)) 1px, transparent 1px);
    background-size: var(--grid-step) var(--grid-step);
    opacity: 0;
    transition: opacity 0.6s var(--easing);
    z-index: 0;
}

.section[data-skeleton].skeleton-active::before {
    opacity: 1;
    animation: skeleton-pulse 2s ease-in-out infinite;
}

.section[data-skeleton].revealed::before {
    opacity: 0;
}

@keyframes skeleton-pulse {
    0%, 100% { opacity: 0.55; }
    50%      { opacity: 1; }
}

/* Reveal staggered children */
.section[data-skeleton] .section-eyebrow,
.section[data-skeleton] .section-heading,
.section[data-skeleton] .lede,
.section[data-skeleton] .lede-small,
.section[data-skeleton] .primary-column p,
.section[data-skeleton] .margin-block,
.section[data-skeleton] .method-stanza,
.section[data-skeleton] .conclusion-line,
.section[data-skeleton] .conclusion-attribution,
.section[data-skeleton] .conclusion-rule,
.section[data-skeleton] .conclusion-coords,
.section[data-skeleton] .evidence-canvas-frame,
.section[data-skeleton] .hero-meta,
.section[data-skeleton] .hero-title,
.section[data-skeleton] .hero-subtitle,
.section[data-skeleton] .hero-coordinates,
.section[data-skeleton] .hero-scroll-hint {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.9s var(--easing), transform 0.9s var(--easing);
}

.section[data-skeleton].revealed .section-eyebrow,
.section[data-skeleton].revealed .section-heading,
.section[data-skeleton].revealed .lede,
.section[data-skeleton].revealed .lede-small,
.section[data-skeleton].revealed .primary-column p,
.section[data-skeleton].revealed .margin-block,
.section[data-skeleton].revealed .method-stanza,
.section[data-skeleton].revealed .conclusion-line,
.section[data-skeleton].revealed .conclusion-attribution,
.section[data-skeleton].revealed .conclusion-rule,
.section[data-skeleton].revealed .conclusion-coords,
.section[data-skeleton].revealed .evidence-canvas-frame,
.section[data-skeleton].revealed .hero-meta,
.section[data-skeleton].revealed .hero-title,
.section[data-skeleton].revealed .hero-subtitle,
.section[data-skeleton].revealed .hero-coordinates,
.section[data-skeleton].revealed .hero-scroll-hint {
    opacity: 1;
    transform: translateY(0);
}

.section[data-skeleton].revealed .hero-meta            { transition-delay: 0.00s; }
.section[data-skeleton].revealed .hero-title           { transition-delay: 0.08s; }
.section[data-skeleton].revealed .hero-subtitle        { transition-delay: 0.16s; }
.section[data-skeleton].revealed .hero-coordinates     { transition-delay: 0.24s; }
.section[data-skeleton].revealed .hero-scroll-hint     { transition-delay: 0.32s; }

.section[data-skeleton].revealed .section-eyebrow      { transition-delay: 0.00s; }
.section[data-skeleton].revealed .section-heading      { transition-delay: 0.08s; }
.section[data-skeleton].revealed .lede,
.section[data-skeleton].revealed .lede-small           { transition-delay: 0.16s; }
.section[data-skeleton].revealed .primary-column p     { transition-delay: 0.24s; }
.section[data-skeleton].revealed .method-stanza        { transition-delay: 0.32s; }
.section[data-skeleton].revealed .margin-block         { transition-delay: 0.40s; }
.section[data-skeleton].revealed .evidence-canvas-frame { transition-delay: 0.48s; }
.section[data-skeleton].revealed .conclusion-line      { transition-delay: 0.16s; }
.section[data-skeleton].revealed .conclusion-attribution { transition-delay: 0.32s; }
.section[data-skeleton].revealed .conclusion-rule      { transition-delay: 0.48s; }
.section[data-skeleton].revealed .conclusion-coords    { transition-delay: 0.64s; }

/* ----------------------------------------------------------------
   Responsive — collapse to single column below 768px
   ---------------------------------------------------------------- */
@media (max-width: 1024px) {
    .section-grid {
        grid-template-columns: 1fr minmax(0, 660px) minmax(0, 280px) 1fr;
        column-gap: 2.5rem;
    }
    .chapter-watermark {
        right: 2rem;
        font-size: clamp(5rem, 14vw, 9rem);
    }
}

@media (max-width: 768px) {
    .masthead {
        padding: 1rem 1.25rem 1.5rem;
    }
    .masthead-inner {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
        font-size: 0.6rem;
    }
    .masthead-title {
        display: none;
    }
    .section {
        padding: 6rem 1.5rem 4rem;
    }
    .section-grid {
        display: block;
    }
    .primary-column,
    .primary-column-wide {
        grid-column: auto;
        max-width: 100%;
    }
    .margin-column {
        grid-column: auto;
        margin-top: 3rem;
        padding-left: 1.25rem;
        border-left: 2px solid var(--accent-metallic);
        gap: 2rem;
    }
    .margin-block {
        font-size: 0.85rem;
    }
    .chapter-watermark {
        font-size: 6rem;
        top: 5rem;
        right: 1rem;
        opacity: 0.06;
    }
    .hero-meta {
        gap: 1rem;
        font-size: 0.6rem;
    }
    .hero-coordinates {
        gap: 1rem;
        font-size: 0.65rem;
    }
    .canvas-caption {
        flex-direction: column;
        gap: 0.4rem;
        left: 1.25rem;
        right: 1.25rem;
    }
    .caption-label {
        border-right: none;
        padding-right: 0;
    }
    .colophon-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .method-stanza {
        grid-template-columns: 2rem 1fr;
        gap: 1rem;
    }
}