:root {
    /* Miss Frizzle / Magic School Bus palette */
    --chrome-bg: #1B3FB5;        /* royal blue */
    --chrome-ink: #FFF8E7;       /* cream */
    --chrome-ink-dim: #B5C8FF;   /* light blue */
    --chrome-rule: #FFD93D;      /* bus yellow */
    --paper: #FFF8E7;            /* cream paper */
    --paper-rule: #1B3FB5;       /* royal-blue rule */
    --ink: #1A1A2E;              /* near-black */
    --ink-soft: #4A4A5E;         /* soft graphite */
    --redact: #1B3FB5;
    --accent: #E63946;           /* planet red */
    --accent-soft: #FF6B7A;      /* lighter red */
    --placeholder-bg: #F2EAD3;
    --placeholder-ink: #6F6650;
    --year-bg: #FFD93D;          /* bus yellow */
    --year-ink: #1A1A2E;         /* dark on yellow */

    /* extra Frizzle accents (decorations / chips) */
    --magenta: #D62D85;
    --comet-green: #06D6A0;
    --bus-yellow: #FFD93D;
    --planet-red: #E63946;

    --mono: 'Schoolbell', 'Comic Sans MS', cursive;
    --serif: 'Quicksand', 'Trebuchet MS', sans-serif;
    --display: 'Caveat Brush', 'Marker Felt', cursive;

    --rail-w: 17rem;
    --content-max: 38rem;
    --gutter: 2rem;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
    background-color: var(--chrome-bg);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='280' height='280' viewBox='0 0 280 280'><g fill='none' stroke='%23FFF8E7' stroke-width='1.4' opacity='0.32'><polygon points='40,20 43,30 53,30 45,36 48,46 40,40 32,46 35,36 27,30 37,30'/><polygon points='220,80 222,86 228,86 223,90 225,96 220,92 215,96 217,90 212,86 218,86'/><polygon points='100,200 103,210 113,210 105,216 108,226 100,220 92,226 95,216 87,210 97,210'/></g><g fill='%23FFD93D' opacity='0.34'><circle cx='180' cy='40' r='4'/><circle cx='60' cy='150' r='3'/><circle cx='240' cy='220' r='3.5'/></g><g fill='none' stroke='%23E63946' stroke-width='1.6' opacity='0.30'><circle cx='130' cy='110' r='14'/><line x1='114' y1='110' x2='146' y2='110'/></g><g fill='none' stroke='%2306D6A0' stroke-width='1.4' opacity='0.34'><path d='M 200 240 q 6 -10 18 -6 q -10 4 -18 6 z'/><circle cx='225' cy='235' r='3'/></g><g fill='%23D62D85' opacity='0.30'><circle cx='30' cy='250' r='3.5'/></g></svg>");
    background-repeat: repeat;
    color: var(--chrome-ink);
    font-family: var(--serif);
    font-size: 18px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.skip-link {
    position: absolute; left: -9999px; top: auto;
    width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus {
    left: 1rem; top: 1rem; width: auto; height: auto;
    background: var(--year-ink); color: var(--ink);
    padding: 0.5rem 0.75rem; z-index: 10;
    font-family: var(--mono); font-size: 0.85rem;
}

/* ---------------- dossier chrome ---------------- */

.dossier-header {
    position: sticky;
    top: 0;
    z-index: 5;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 1.25rem;
    background: var(--chrome-bg);
    border-bottom: 1px solid var(--chrome-rule);
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
}
.filemark { color: var(--chrome-ink-dim); }
.header-nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}
.exit-mark {
    color: var(--chrome-ink);
    text-decoration: none;
    border: 1px solid var(--chrome-rule);
    padding: 0.25rem 0.6rem;
    border-radius: 1px;
}
.exit-mark:hover { color: var(--year-ink); border-color: var(--chrome-ink-dim); }

.dossier-footer {
    padding: 3rem 0 6rem;
    text-align: center;
}
.dossier-footer .filemark {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    color: var(--chrome-ink-dim);
    margin-bottom: 0.5rem;
}
.footer-note {
    font-family: var(--serif);
    font-style: italic;
    color: var(--chrome-ink-dim);
    max-width: 26rem;
    margin: 0 auto;
}

/* ---------------- layout ---------------- */

.layout {
    display: grid;
    grid-template-columns: var(--rail-w) 1fr;
    gap: 0;
    max-width: 78rem;
    margin: 0 auto;
}

/* ---------------- timeline rail ---------------- */

.timeline {
    border-right: 1px solid var(--chrome-rule);
    padding: 1.5rem 1rem 4rem;
    font-family: var(--mono);
    font-size: 0.78rem;
    line-height: 1.5;
    position: sticky;
    top: 3rem;
    align-self: start;
    height: calc(100vh - 3rem);
    overflow-y: auto;
}
.timeline-toggle {
    display: none;
    width: 100%;
    background: transparent;
    color: var(--chrome-ink-dim);
    border: 1px solid var(--chrome-rule);
    padding: 0.5rem 0.75rem;
    font-family: var(--mono);
    font-size: 0.78rem;
    text-align: left;
    cursor: pointer;
    justify-content: space-between;
    align-items: center;
}
.timeline-toggle .caret { transition: transform 0.15s ease; }
.timeline-toggle[aria-expanded="true"] .caret { transform: rotate(180deg); }

.timeline-list, .timeline-list ol {
    list-style: none;
    padding: 0;
    margin: 0;
}
.t-era {
    margin-bottom: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--chrome-rule);
}
.t-era:first-child { border-top: none; padding-top: 0; }
.t-era-label {
    display: block;
    color: var(--chrome-ink-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.7rem;
    margin-bottom: 0.5rem;
}
.timeline-list li > a {
    display: flex;
    gap: 0.55rem;
    padding: 0.18rem 0;
    color: var(--chrome-ink);
    text-decoration: none;
    border-left: 2px solid transparent;
    padding-left: 0.5rem;
    margin-left: -0.5rem;
}
.timeline-list li > a:hover {
    color: var(--year-ink);
}
.timeline-list li > a.is-active {
    color: var(--year-ink);
    border-left-color: var(--year-ink);
}
.t-year {
    color: var(--chrome-ink-dim);
    min-width: 2.6rem;
}
.timeline-list li > a.is-active .t-year { color: var(--year-ink); }

/* ---------------- chapters ---------------- */

.chapters {
    padding: 2.5rem var(--gutter) 0;
    min-width: 0;
}

.opening {
    background: var(--paper);
    color: var(--ink);
    padding: 3rem 2.5rem 2.5rem;
    margin: 0 auto 3rem;
    max-width: var(--content-max);
    border: 3px solid var(--ink);
    box-shadow: 10px 10px 0 var(--bus-yellow), 10px 10px 0 3px var(--ink);
    border-radius: 8px;
}
.kicker {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    color: var(--ink-soft);
    text-transform: uppercase;
    margin: 0 0 1rem;
}
.opening h1 {
    font-family: var(--display);
    font-weight: 400;
    font-size: clamp(3rem, 7vw, 4.6rem);
    line-height: 1;
    letter-spacing: 0;
    margin: 0 0 1.5rem;
    color: var(--accent);
    text-shadow: 3px 3px 0 var(--bus-yellow);
}
.lede {
    font-size: 1.2rem;
    color: var(--ink-soft);
    font-style: italic;
    margin: 0 0 2rem;
    border-left: 2px solid var(--ink-soft);
    padding-left: 1rem;
}
.opening-pivot {
    margin: 2.5rem 0 0;
    font-size: 1.1rem;
    color: var(--ink);
    font-style: italic;
}

/* poll */
.poll {
    border: 1px solid var(--paper-rule);
    padding: 1.25rem 1.25rem 0.75rem;
    background: rgba(0,0,0,0.025);
}
.poll-q {
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.85rem;
    color: var(--ink);
    margin: 0 0 0.85rem;
}
.poll-options { list-style: none; margin: 0; padding: 0; }
.poll-options li {
    display: grid;
    grid-template-columns: 1fr 8rem 3rem;
    align-items: center;
    gap: 0.75rem;
    padding: 0.4rem 0;
    border-top: 1px dashed var(--paper-rule);
}
.poll-options li:first-child { border-top: none; }
.poll-label { color: var(--ink); }
.poll-bar {
    display: block;
    height: 8px;
    background: var(--paper-rule);
    position: relative;
}
.poll-fill {
    display: block;
    height: 100%;
    background: var(--accent);
}
.poll-pct {
    font-family: var(--mono);
    color: var(--ink-soft);
    font-size: 0.8rem;
    text-align: right;
}
.poll-note {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--placeholder-ink);
    margin: 0.75rem 0 0;
}

/* era dividers */
.era-divider {
    text-align: center;
    margin: 4rem auto 2rem;
    max-width: var(--content-max);
    padding-top: 2rem;
    border-top: 1px solid var(--chrome-rule);
}
.era-divider .filemark {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    color: var(--chrome-ink-dim);
    margin: 0 0 0.5rem;
}
.era-divider h2 {
    font-family: var(--display);
    font-size: 2.8rem;
    font-weight: 400;
    margin: 0 0 1rem;
    color: var(--bus-yellow);
    letter-spacing: 0.01em;
    text-shadow: 2px 2px 0 var(--planet-red);
}
.era-divider .placeholder { max-width: 30rem; margin: 0 auto; }

/* chapter cards */
.chapter {
    background: var(--paper);
    color: var(--ink);
    border: 3px solid var(--ink);
    margin: 1.5rem auto;
    max-width: var(--content-max);
    padding: 0;
    box-shadow: 6px 6px 0 var(--bus-yellow);
    border-radius: 6px;
    scroll-margin-top: 4rem;
}
.chapter > header {
    display: flex;
    align-items: stretch;
    border-bottom: 1px solid var(--paper-rule);
    background: rgba(0,0,0,0.03);
}
.chapter > header .year {
    background: var(--year-bg);
    color: var(--year-ink);
    font-family: var(--mono);
    font-size: 0.95rem;
    padding: 0.85rem 1rem;
    letter-spacing: 0.04em;
    display: flex;
    align-items: center;
}
.chapter > header h3 {
    margin: 0;
    padding: 0.75rem 1.25rem;
    font-family: var(--display);
    font-weight: 400;
    font-size: 1.8rem;
    color: var(--ink);
    line-height: 1.1;
    display: flex;
    align-items: center;
    letter-spacing: 0.01em;
}
.chapter-body {
    padding: 1.5rem 1.5rem 0.75rem;
    font-family: var(--serif);
    font-size: 1.05rem;
    line-height: 1.65;
}
.chapter-body p { margin: 0 0 1rem; }

/* placeholder boxes (clearly draft) */
.placeholder {
    font-family: var(--mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--placeholder-ink);
    background: repeating-linear-gradient(
        135deg,
        transparent 0,
        transparent 6px,
        rgba(0,0,0,0.04) 6px,
        rgba(0,0,0,0.04) 7px
    ), var(--placeholder-bg);
    border: 1px dashed var(--paper-rule);
    padding: 0.85rem 1rem;
    margin: 0 1rem 1.25rem;
}
.chapter-body .placeholder { margin: 0 0 1rem; }

/* evidence section inside chapter */
.evidence {
    padding: 0 1.5rem 1.5rem;
}
.evidence:empty { display: none; }
.evidence-head {
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-soft);
    margin: 0.5rem 0 0.65rem;
    border-top: 1px solid var(--paper-rule);
    padding-top: 0.85rem;
}
.evidence-head::before { content: "◢ "; color: var(--accent); }

.evidence-card {
    border-left: 2px solid var(--accent);
    padding: 0.5rem 0.75rem 0.5rem 0.85rem;
    margin: 0.5rem 0;
    background: rgba(0,0,0,0.02);
}
.evidence-claim {
    font-family: var(--serif);
    font-size: 1rem;
    color: var(--ink);
    margin: 0 0 0.5rem;
}
.evidence-sources {
    list-style: none;
    padding: 0;
    margin: 0;
    font-family: var(--mono);
    font-size: 0.78rem;
}
.evidence-sources li {
    padding: 0.15rem 0;
    color: var(--ink-soft);
}
.evidence-sources li::before {
    content: "[src." attr(data-n) "] ";
    color: var(--accent);
}
.evidence-sources a {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}
.evidence-sources a:hover { color: var(--accent); }
.evidence-sources .src-type {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
    margin-left: 0.4rem;
}

/* source quote + clip image */
.source-quote {
    font-family: var(--serif);
    font-style: italic;
    margin: 0.5rem 0 0.4rem 0.4rem;
    padding: 0.15rem 0 0.15rem 0.6rem;
    border-left: 2px solid var(--ink-soft);
    color: var(--ink);
    font-size: 0.95rem;
    line-height: 1.45;
}
.source-quote::before { content: "“"; margin-right: 0.05em; }
.source-quote::after { content: "”"; margin-left: 0.05em; }

.source-clip {
    margin: 0.5rem 0 0.4rem;
}
.source-clip a {
    display: inline-block;
    line-height: 0;
}
.source-clip img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--paper-rule);
    box-shadow: 0 1px 2px rgba(0,0,0,0.12), 0 4px 12px -4px rgba(0,0,0,0.25);
    background: #fff;
    border-radius: 1px;
}
.source-clip img:hover {
    box-shadow: 0 2px 4px rgba(0,0,0,0.16), 0 6px 18px -4px rgba(0,0,0,0.30);
}

/* narrative (prose) blurbs */
.narrative-blurb {
    max-width: var(--content-max);
    margin: 1rem auto 1.5rem;
    padding: 1rem 1.25rem;
    background: rgba(196, 184, 156, 0.08);
    border: 1px solid var(--chrome-rule);
    border-left: 3px solid var(--year-ink);
    color: var(--chrome-ink);
    font-family: var(--serif);
    font-size: 1.05rem;
    line-height: 1.55;
    font-style: italic;
}
.narrative-blurb p {
    margin: 0 0 0.5rem;
}
.narrative-blurb p:last-child {
    margin-bottom: 0;
}
.narrative-anchor {
    background: rgba(0,0,0,0.04);
    border: 1px dashed var(--paper-rule);
    border-left: 3px solid var(--year-ink);
    color: var(--ink);
    margin: 0 0 1.25rem;
    padding: 0.85rem 1rem;
    font-size: 1rem;
}
.narrative-stamp {
    font-family: var(--mono);
    font-style: normal;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--chrome-ink-dim);
    margin: 0.4rem 0 0;
    text-transform: lowercase;
}
.narrative-anchor .narrative-stamp { color: var(--placeholder-ink); }

body.prose-off .narrative-blurb { display: none; }

#prose-toggle.exit-mark {
    cursor: pointer;
    font-family: var(--mono);
    font-size: 0.78rem;
}
#prose-toggle[aria-pressed="true"] { color: var(--year-ink); border-color: var(--chrome-ink-dim); }

/* ---------------- theme filter bar ---------------- */

.theme-bar {
    position: sticky;
    top: 2.85rem;
    z-index: 4;
    background: var(--chrome-bg);
    border-bottom: 1px solid var(--chrome-rule);
    font-family: var(--mono);
    font-size: 0.78rem;
    padding: 0.55rem 1.25rem;
}
.theme-bar:empty { display: none; }
.theme-bar-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.75rem;
    align-items: center;
    max-width: 78rem;
    margin: 0 auto;
}
.theme-label {
    color: var(--chrome-ink-dim);
    letter-spacing: 0.06em;
    flex-shrink: 0;
}
.theme-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}
.theme-chip,
.theme-more {
    cursor: pointer;
    font-family: var(--mono);
    font-size: 0.74rem;
    background: transparent;
    color: var(--chrome-ink);
    border: 1px solid var(--chrome-rule);
    padding: 0.22rem 0.55rem;
    border-radius: 1px;
    line-height: 1.1;
}
.theme-chip:hover,
.theme-more:hover {
    color: var(--year-ink);
    border-color: var(--chrome-ink-dim);
}
.theme-chip.is-active {
    color: var(--ink);
    background: var(--year-ink);
    border-color: var(--year-ink);
    font-weight: 600;
}
.theme-overflow {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.35rem;
    width: 100%;
}
.theme-overflow[hidden] { display: none; }
.theme-clear {
    cursor: pointer;
    font-family: var(--mono);
    font-size: 0.72rem;
    background: transparent;
    color: var(--accent);
    border: none;
    padding: 0.22rem 0.4rem;
    text-decoration: underline;
    text-underline-offset: 2px;
}
.theme-clear:hover { color: var(--accent-soft); }
.theme-count {
    color: var(--chrome-ink-dim);
    margin-left: auto;
    font-size: 0.72rem;
}

/* filter hide states */
.filter-hidden { display: none !important; }
.timeline-list a.filter-dim {
    opacity: 0.28;
}
.timeline-list a.filter-dim .t-year { opacity: 1; }

/* bump timeline rail's sticky top to clear header + theme bar */
.timeline {
    top: 5.6rem;
    height: calc(100vh - 5.6rem);
}

/* ---------------- see-also lateral links ---------------- */

.see-also {
    margin: 0.5rem 1.5rem 0;
    padding: 0.5rem 0 0;
    border-top: 1px dashed var(--paper-rule);
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--ink-soft);
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.55rem;
    align-items: baseline;
}
.see-also-label {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-soft);
}
.see-also-label::before { content: "↔ "; color: var(--accent); }
.see-also a {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}
.see-also a:hover { color: var(--accent); }

/* jump-highlight: pulse the destination card when arriving via see-also */
.evidence-card.jump-highlight {
    box-shadow: 0 0 0 2px var(--year-ink), 0 0 12px -2px var(--year-ink);
    transition: box-shadow 0.4s ease;
}

@media (max-width: 880px) {
    .theme-bar { padding: 0.5rem 1rem; }
    .timeline { top: 0; height: auto; }
    .see-also { margin: 0.5rem 1rem 0; }
}

/* redaction utility */
.redact {
    background: var(--redact);
    color: var(--redact);
    user-select: none;
    padding: 0 0.25em;
    border-radius: 1px;
}

/* ---------------- mobile ---------------- */

@media (max-width: 880px) {
    :root { --gutter: 1rem; }

    .layout { display: block; }

    .timeline {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--chrome-rule);
        padding: 0.75rem 1rem;
    }
    .timeline-toggle {
        display: flex;
    }
    .timeline-list {
        display: none;
        padding-top: 0.75rem;
    }
    .timeline.is-open .timeline-list {
        display: block;
    }

    .chapters {
        padding: 1.25rem 1rem 0;
    }
    .opening {
        padding: 2rem 1.25rem 1.5rem;
        margin: 0 0 2rem;
        box-shadow: 0 1px 0 var(--chrome-rule), 6px 6px 0 -1px rgba(0,0,0,0.4);
    }
    .chapter > header h3 {
        font-size: 1.15rem;
        padding: 0.6rem 1rem;
    }
    .chapter > header .year {
        font-size: 0.82rem;
        padding: 0.6rem 0.75rem;
    }
    .chapter-body { padding: 1rem 1rem 0.5rem; font-size: 1rem; }
    .evidence { padding: 0 1rem 1rem; }
    .placeholder { margin: 0 0 0.75rem; }
    .poll-options li { grid-template-columns: 1fr 5rem 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
    .timeline-toggle .caret { transition: none; }
}