/* ---------------------------------------------------------------------------
   iggi.boo — continuous record / no. 0042 / r.07
   Stylesheet for an archival-bureaucratic publication.
   --------------------------------------------------------------------------- */

:root {
    /* Cool-gray palette (DESIGN.md) */
    --ink:        #0F1419;   /* primary type, masthead, slab headings */
    --charcoal:   #2A323A;   /* secondary headings, primary diagrams */
    --steel:      #4F5963;   /* body text, mono marginalia */
    --pewter:     #7A848D;   /* hairline borders, captions */
    --concrete:   #B5BCC4;   /* baseline grid, plate borders */
    --drafting:   #D8DCE0;   /* secondary panel, archival sidebar */
    --newsprint:  #EEF0F2;   /* primary page background */
    --service:    #1B4F6B;   /* sole accent, sparingly used */

    /* Type families */
    --ff-display: 'Roboto Slab', Georgia, serif;
    --ff-body:    'Source Serif 4', 'Source Serif Pro', Georgia, serif;
    --ff-mono:    'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;
    --ff-mark:    'Archivo Black', 'Roboto Slab', sans-serif;

    /* Grid metrics — 12 columns, 8px baseline */
    --col-count: 12;
    --col-gap:   16px;
    --baseline:  8px;

    /* Layout zones */
    --rail-w:    96px;
    --max-w:     1280px;
    --gutter:    32px;
    --section-gap: 96px;
}

* { box-sizing: border-box; }

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

html { scroll-behavior: smooth; }

body {
    background: var(--newsprint);
    color: var(--ink);
    font-family: var(--ff-body);
    font-size: 16px;
    line-height: 1.62;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* --------------------------------------------------------------------------
   Visible baseline grid (fixed, 4% concrete-gray)
   -------------------------------------------------------------------------- */
.baseline-grid {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
    opacity: 0.35; /* the line stroke itself is concrete-gray; resolved opacity ~4% */
    mix-blend-mode: multiply;
}

.baseline-grid line { stroke: var(--concrete); }

.svg-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --------------------------------------------------------------------------
   Page corner registration marks (signature watermark)
   -------------------------------------------------------------------------- */
.reg {
    position: fixed;
    width: 16px;
    height: 16px;
    z-index: 50;
    pointer-events: none;
    color: var(--charcoal);
}
.reg-tl { top: 12px;    left: 12px; }
.reg-tr { top: 12px;    right: 12px; }
.reg-bl { bottom: 12px; left: 12px; }
.reg-br { bottom: 12px; right: 12px; }

/* --------------------------------------------------------------------------
   Masthead — F-pattern upper crossbar
   -------------------------------------------------------------------------- */
.masthead {
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--newsprint);
    border-bottom: 1px solid var(--concrete);
}

.mast-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 24px 48px 16px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 32px;
    align-items: baseline;
}

.wordmark {
    font-family: var(--ff-mark);
    font-size: clamp(1.4rem, 2vw, 1.75rem);
    color: var(--ink);
    letter-spacing: -0.01em;
    line-height: 1;
}

.section-index {
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    color: var(--charcoal);
    transition: color 320ms ease-out;
}

.datestamp {
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.02em;
    color: var(--steel);
}

/* --------------------------------------------------------------------------
   Left rail (F-pattern stem) — circuit-trace scroll progress
   -------------------------------------------------------------------------- */
.left-rail {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--rail-w);
    height: 100vh;
    z-index: 5;
    pointer-events: none;
    padding-top: 80px;
}

.circuit-trace {
    width: 100%;
    height: calc(100vh - 80px);
    display: block;
}

#trace-active {
    /* Path-length is set in script.js for accurate dasharray; fallback below. */
    stroke-dasharray: 4000;
    stroke-dashoffset: 4000;
    transition: stroke-dashoffset 480ms ease-in-out;
}

/* --------------------------------------------------------------------------
   Main report layout
   -------------------------------------------------------------------------- */
.report {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 48px 48px 96px calc(var(--rail-w) + 16px);
    position: relative;
    z-index: 10;
}

/* --------------------------------------------------------------------------
   Chapter — F-pattern middle crossbar + body
   -------------------------------------------------------------------------- */
.chapter {
    margin-bottom: var(--section-gap);
    padding-top: 24px;
}

.chapter:first-of-type { padding-top: 8px; }

/* Rule 02 — mid-century double-rule divider */
.rule-02 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin-bottom: 24px;
    align-items: center;
    position: relative;
}

.rule-line {
    display: block;
    background: var(--pewter);
    width: 100%;
}
.rule-thin {
    height: 1px;
}
.rule-thick {
    height: 2px;
    background: var(--charcoal);
    margin-top: 24px;
}
.rule-mark {
    font-family: var(--ff-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--steel);
    margin-top: 8px;
    text-transform: uppercase;
}

/* Chapter heading row — F-pattern crossbar */
.chapter-header {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 32px;
    align-items: end;
    margin-bottom: 40px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--concrete);
}

.chapter-h2 {
    font-family: var(--ff-display);
    font-weight: 700;
    color: var(--ink);
    font-size: clamp(1.6rem, 2.6vw, 2.2rem);
    line-height: 1.18;
    letter-spacing: -0.008em;
    margin: 0;
}

.chapter-caption {
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.02em;
    color: var(--steel);
    margin: 0 0 6px 0;
    line-height: 1.5;
    text-align: left;
}

/* Chapter body — primary column + archival sidebar */
.chapter-body {
    display: grid;
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
}

.prose {
    color: var(--ink);
    max-width: 62ch;
}

.prose p {
    margin: 0 0 1.1em 0;
    text-align: justify;
    hyphens: auto;
    text-wrap: pretty;
}

.prose em {
    font-style: italic;
    color: var(--charcoal);
}

.chapter-h1 {
    font-family: var(--ff-display);
    font-weight: 700;
    font-size: clamp(2.6rem, 4.4vw, 3.8rem);
    line-height: 1.12;
    letter-spacing: -0.012em;
    color: var(--ink);
    margin: 0 0 24px 0;
}

.lede { font-size: 17px; }

.dropcap {
    font-family: var(--ff-display);
    font-weight: 700;
    color: var(--ink);
    float: left;
    font-size: 4.4em;
    line-height: 0.92;
    padding: 0.05em 0.08em 0 0;
    margin-right: 0.04em;
    margin-top: 0.04em;
}

.footnote-source {
    color: var(--steel);
    font-size: 15px;
}

.fn-ref {
    color: var(--service);
    font-family: var(--ff-mono);
    font-size: 11px;
    margin-left: 2px;
    letter-spacing: 0.03em;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 240ms ease-out;
}

.fn-ref:hover {
    border-color: var(--service);
}

/* --------------------------------------------------------------------------
   Sidebar — archival plates + pull-quotes (columns 9-12)
   -------------------------------------------------------------------------- */
.sidebar {
    background: var(--drafting);
    padding: 24px;
    border: 1px solid var(--concrete);
    position: relative;
}

.sidebar::before,
.sidebar::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border: 1px solid var(--charcoal);
    background: transparent;
}
.sidebar::before { top: -4px; left: -4px; border-width: 1px 0 0 1px; }
.sidebar::after  { top: -4px; right: -4px; border-width: 1px 1px 0 0; }

.plate {
    margin: 0 0 24px 0;
    padding: 0;
}

.plate-frame {
    background: var(--newsprint);
    padding: 4px;
    border: 1px solid var(--concrete);
    box-shadow: 0 1px 0 rgba(15, 20, 25, 0.04), 0 2px 6px rgba(15, 20, 25, 0.04);
}

.plate-art {
    display: block;
    width: 100%;
    height: auto;
}

.plate figcaption {
    font-family: var(--ff-mono);
    font-size: 12px;
    letter-spacing: 0.02em;
    color: var(--steel);
    margin-top: 8px;
    line-height: 1.5;
}

.pull-quote {
    font-family: var(--ff-display);
    font-style: italic;
    font-weight: 500;
    font-size: 1.2rem;
    line-height: 1.32;
    color: var(--charcoal);
    margin: 0 0 8px 0;
    padding: 0 0 0 16px;
    border-left: 2px solid var(--service);
}

.pq-source {
    font-family: var(--ff-mono);
    font-size: 12px;
    letter-spacing: 0.02em;
    color: var(--steel);
    margin: 0 0 24px 0;
}

/* --------------------------------------------------------------------------
   Definition-term blocks
   -------------------------------------------------------------------------- */
.defterm-list { margin-top: 24px; }

.defterm {
    margin: 0 0 12px 0;
    padding: 8px 0 8px 16px;
    border-left: 1px solid var(--concrete);
    color: var(--steel);
    font-size: 15.5px;
}

.defterm .term {
    font-family: var(--ff-display);
    font-weight: 500;
    color: var(--ink);
    margin-right: 4px;
}

/* --------------------------------------------------------------------------
   Apparatus — service-manual table
   -------------------------------------------------------------------------- */
.apparatus {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
    font-family: var(--ff-body);
}

.apparatus th,
.apparatus td {
    text-align: left;
    padding: 10px 12px 10px 0;
    border-bottom: 1px solid var(--concrete);
    vertical-align: top;
}

.apparatus th {
    font-family: var(--ff-mono);
    font-weight: 500;
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--steel);
    border-bottom: 1px solid var(--charcoal);
    padding-bottom: 8px;
}

.apparatus td:first-child {
    font-family: var(--ff-mono);
    color: var(--charcoal);
    font-size: 13px;
    width: 12%;
}

.apparatus td:last-child {
    font-family: var(--ff-mono);
    color: var(--steel);
    font-size: 12px;
    width: 12%;
}

/* --------------------------------------------------------------------------
   Findings list
   -------------------------------------------------------------------------- */
.findings {
    list-style: none;
    padding: 0;
    margin: 24px 0 0 0;
    counter-reset: finding;
}

.findings li {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--concrete);
    align-items: start;
}

.findings li:last-child { border-bottom: none; }

.finding-mark {
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    color: var(--service);
    padding-top: 2px;
}

.findings li p { margin: 0; color: var(--ink); }

.swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    background: var(--service);
    vertical-align: middle;
    margin: 0 4px 2px 0;
    border: 1px solid var(--charcoal);
}

.findings code {
    font-family: var(--ff-mono);
    font-size: 12px;
    color: var(--charcoal);
    background: var(--drafting);
    padding: 0 4px;
}

/* --------------------------------------------------------------------------
   Colophon — definition list
   -------------------------------------------------------------------------- */
.colophon-list {
    margin: 24px 0;
    padding: 0;
}

.cl-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 24px;
    padding: 12px 0;
    border-bottom: 1px solid var(--concrete);
    align-items: center;
}

.cl-row dt {
    font-family: var(--ff-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--steel);
    margin: 0;
}

.cl-row dd {
    font-family: var(--ff-body);
    font-size: 15px;
    color: var(--ink);
    margin: 0;
}

.sw {
    display: inline-block;
    width: 18px;
    height: 18px;
    margin-right: 4px;
    border: 1px solid var(--charcoal);
    vertical-align: middle;
}
.sw[data-c="#0F1419"] { background: #0F1419; }
.sw[data-c="#2A323A"] { background: #2A323A; }
.sw[data-c="#4F5963"] { background: #4F5963; }
.sw[data-c="#7A848D"] { background: #7A848D; }
.sw[data-c="#B5BCC4"] { background: #B5BCC4; }
.sw[data-c="#D8DCE0"] { background: #D8DCE0; }
.sw[data-c="#EEF0F2"] { background: #EEF0F2; }
.sw[data-c="#1B4F6B"] { background: #1B4F6B; }
.sw-accent { outline: 1px dashed var(--service); outline-offset: 1px; }

.closing {
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    color: var(--charcoal);
    margin-top: 32px;
    padding-top: 24px;
    border-top: 2px solid var(--charcoal);
    text-align: left;
}

/* --------------------------------------------------------------------------
   Footnotes block
   -------------------------------------------------------------------------- */
.footnotes {
    margin: 64px 0 48px;
    padding-top: 16px;
}

.fn-list {
    list-style: none;
    margin: 24px 0 0 0;
    padding: 0;
    counter-reset: fn;
}

.fn-list li {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 12px;
    padding: 8px 0;
    font-size: 14px;
    color: var(--steel);
    line-height: 1.55;
}

.fn-num {
    font-family: var(--ff-mono);
    font-size: 13px;
    color: var(--service);
    letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   Footer running-foot
   -------------------------------------------------------------------------- */
.footer-foot {
    border-top: 1px solid var(--concrete);
    background: var(--newsprint);
    margin-top: 48px;
    padding: 24px 48px 48px calc(var(--rail-w) + 16px);
    position: relative;
    z-index: 10;
}

.ff-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    font-family: var(--ff-mono);
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--steel);
    text-align: center;
}

.ff-mark { color: var(--ink); font-weight: 500; }
.ff-sep  { color: var(--pewter); margin: 0 6px; }

/* --------------------------------------------------------------------------
   Scroll-triggered reveal — single primitive
   -------------------------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 320ms ease-out, transform 320ms ease-out;
    will-change: opacity, transform;
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Active section index in masthead */
.section-index.is-energized {
    color: var(--service);
}

/* --------------------------------------------------------------------------
   Responsive — collapse F-pattern gracefully on narrow screens
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
    .left-rail { width: 64px; }
    .report { padding-left: 80px; padding-right: 24px; }
    .footer-foot { padding-left: 80px; padding-right: 24px; }
    .mast-inner { padding: 20px 24px 14px; gap: 16px; }

    .chapter-header {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .chapter-body {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .chapter-h1 { font-size: 2.2rem; }
}

@media (max-width: 640px) {
    :root { --rail-w: 56px; }
    .report { padding-left: 64px; padding-right: 16px; }
    .footer-foot { padding-left: 64px; padding-right: 16px; }
    .mast-inner {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    .datestamp { font-size: 12px; }
    .reg { width: 12px; height: 12px; }
    .findings li {
        grid-template-columns: 48px 1fr;
        gap: 10px;
    }
    .cl-row {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    .fn-list li {
        grid-template-columns: 36px 1fr;
    }
    .dropcap { font-size: 3.2em; }
}