:root {
  color-scheme: light;
  --paper: #efe7d3;
  --surface: #f7f1e3;
  --surface-raised: #fffaf0;
  --ink: #172128;
  --muted: #36454a;
  --accent: #5d3b13;
  --accent-ink: #fffaf0;
  --brass: #634514;
  --line: #897654;
  --line-soft: #c8b897;
  --plot-paper: #edf1ec;
  --plot-blue: #29445d;
  --plot-ochre: #785018;
  --plot-grid: #c5d1cf;
  --shadow: 0 18px 44px rgb(47 37 19 / 12%);
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --ui: "Avenir Next", Avenir, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --bar-h: 3.25rem;
  --ruler-strip-h: 0px;
  font-family: var(--ui);
  background: var(--paper);
  color: var(--ink);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #111311;
  --surface: #191b16;
  --surface-raised: #20231c;
  --ink: #f5e9c8;
  --muted: #d8c79e;
  --accent: #f0c878;
  --accent-ink: #201809;
  --brass: #e2ba68;
  --line: #796b4c;
  --line-soft: #4b483a;
  --plot-paper: #171810;
  --plot-blue: #f7cf78;
  --plot-ochre: #ef9564;
  --plot-grid: #4a4637;
  --shadow: 0 18px 48px rgb(0 0 0 / 38%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #111311;
    --surface: #191b16;
    --surface-raised: #20231c;
    --ink: #f5e9c8;
    --muted: #d8c79e;
    --accent: #f0c878;
    --accent-ink: #201809;
    --brass: #e2ba68;
    --line: #796b4c;
    --line-soft: #4b483a;
    --plot-paper: #171810;
    --plot-blue: #f7cf78;
    --plot-ochre: #ef9564;
    --plot-grid: #4a4637;
    --shadow: 0 18px 48px rgb(0 0 0 / 38%);
  }
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; scroll-padding-top: calc(var(--bar-h) + var(--ruler-strip-h) + 1rem); }
body { margin: 0; min-width: 320px; background: var(--paper); color: var(--ink); font-size: 1rem; line-height: 1.65; }
body, button, input, select { font-family: var(--ui); }
button, input, select { color: inherit; }
img, svg { max-width: 100%; }
button { font-size: inherit; }
a { color: var(--accent); text-decoration-thickness: .07em; text-underline-offset: .19em; }
a:hover { text-decoration-thickness: .13em; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
::selection { color: var(--accent-ink); background: var(--accent); }
[hidden], svg[hidden] { display: none !important; }
.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }

.skip-link { position: fixed; z-index: 100; left: .7rem; top: .7rem; transform: translateY(-180%); padding: .6rem .9rem; background: var(--surface-raised); color: var(--ink); border: 2px solid var(--accent); }
.skip-link:focus { transform: translateY(0); }
.topbar { position: sticky; z-index: 50; top: 0; display: flex; align-items: center; gap: clamp(.55rem, 1.7vw, 1.5rem); height: var(--bar-h); padding: 0 clamp(.65rem, 2vw, 1.5rem); border-bottom: 1px solid var(--line-soft); background: color-mix(in srgb, var(--paper) 94%, transparent); backdrop-filter: blur(12px); font: 500 .91rem/1 var(--ui); }
.home { flex: 0 0 auto; color: var(--ink); text-decoration: none; font-weight: 650; letter-spacing: -.025em; white-space: nowrap; }
.topnav { display: flex; min-width: 0; max-width: min(54vw, 45rem); overflow-x: auto; scrollbar-width: none; gap: .2rem; white-space: nowrap; }
.topnav::-webkit-scrollbar { display: none; }
.topnav a { display: block; padding: .55rem .62rem; border-radius: 999px; color: var(--muted); text-decoration: none; }
.topnav a:hover, .topnav a[aria-current="location"] { color: var(--ink); background: color-mix(in srgb, var(--accent) 11%, transparent); }
.top-spacer { flex: 1 1 auto; }
.language-link { flex: 0 0 auto; display: inline-flex; align-items: center; min-height: 2.25rem; padding: 0 .65rem; border: 1px solid var(--line-soft); border-radius: 999px; color: var(--ink); text-decoration: none; }
.icon-btn { flex: 0 0 auto; display: inline-grid; place-items: center; width: 2.4rem; height: 2.4rem; border: 1px solid var(--line-soft); border-radius: 50%; background: transparent; color: var(--ink); cursor: pointer; }
.icon-btn svg { display: block; width: 1rem; height: 1rem; }
.icon-btn svg[hidden] { display: none; }
.topbar-progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; transform: scaleX(0); transform-origin: left; background: var(--brass); pointer-events: none; }

main { display: block; }
.story-layout { display: grid; grid-template-columns: minmax(0, 46rem) minmax(17rem, 23rem); justify-content: center; gap: clamp(2rem, 4vw, 4rem); max-width: 80rem; margin: 0 auto; padding: clamp(2.3rem, 6vw, 5.8rem) clamp(1.1rem, 4vw, 3.5rem) 4rem; }
.story { min-width: 0; }
.visual-rail { grid-column: 2; grid-row: 1; }
.story { grid-column: 1; grid-row: 1; }
.intro { min-height: 66vh; display: flex; flex-direction: column; justify-content: center; padding: 0 0 clamp(3rem, 7vh, 6rem); }
.eyebrow, .chapter-stamp, .micro-label { color: var(--muted); font: 650 .74rem/1.45 var(--mono); letter-spacing: .035em; text-transform: uppercase; }
.eyebrow { margin: 0 0 1.25rem; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -.035em; line-height: 1.08; text-wrap: balance; }
h1 { max-width: 12ch; margin: 0; font-size: clamp(3rem, 7.6vw, 6.8rem); }
.dek { max-width: 39rem; margin: 1.5rem 0 0; color: var(--muted); font: 400 clamp(1.12rem, 1.7vw, 1.42rem)/1.55 var(--serif); }
.intro-rule { width: 5.5rem; height: 1px; margin: 2rem 0 0; border: 0; background: var(--brass); }
.section-kicker { margin: 0 0 .65rem; color: var(--brass); font: 650 .7rem/1.35 var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.chapter { min-width: 0; padding: clamp(2.3rem, 7vh, 5rem) 0 clamp(3.2rem, 9vh, 7rem); border-top: 1px solid var(--line-soft); scroll-margin-top: calc(var(--bar-h) + var(--ruler-strip-h) + 1.5rem); }
.chapter h2 { max-width: 17ch; margin: .45rem 0 1.25rem; font-size: clamp(2rem, 4.2vw, 3.5rem); }
.chapter p { max-width: 42rem; }
.chapter-stamp { margin: 0; color: var(--brass); }
.copy-pending { max-width: 38rem; margin: 1.7rem 0 0; padding-left: 1rem; border-left: 2px solid var(--line-soft); color: var(--muted); font: italic 1rem/1.6 var(--serif); }
.interaction { margin: 2rem 0 0; padding: clamp(1rem, 2.5vw, 1.6rem); border: 1px solid var(--line-soft); background: var(--surface); box-shadow: var(--shadow); }
.interaction h3 { margin: 0; font-size: clamp(1.4rem, 2.5vw, 2rem); }
.interaction > p:first-of-type { margin: .55rem 0 1.2rem; color: var(--muted); }

.visual-rail { align-self: start; min-width: 0; position: sticky; top: calc(var(--bar-h) + 1rem); max-height: calc(100vh - var(--bar-h) - 2rem); overflow: auto; padding: 1.2rem 1.05rem 1.1rem; border: 1px solid var(--line); background: linear-gradient(135deg, color-mix(in srgb, var(--brass) 7%, transparent), transparent 44%), var(--surface); box-shadow: var(--shadow), inset 0 0 0 3px color-mix(in srgb, var(--brass) 8%, transparent); }
.visual-rail h2 { margin: 0; font: 650 .72rem/1.5 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.visual-rail > p { margin: .6rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.5; }
.ruler-toggle { display: none; }
.ruler-assembly { display: grid; grid-template-columns: 2.4rem minmax(0, 1fr); gap: .75rem; align-items: stretch; min-height: min(57vh, 32rem); margin: 1.1rem 0 .55rem; }
.ruler-frame { position: relative; min-height: 24rem; margin: 0; border: 1px solid color-mix(in srgb, var(--brass) 42%, var(--line-soft)); background: color-mix(in srgb, var(--brass) 5%, var(--surface-raised)); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--brass) 8%, transparent); }
.ruler-frame::before { content: ""; position: absolute; inset: .25rem; border: 1px solid color-mix(in srgb, var(--brass) 18%, transparent); pointer-events: none; }
.log-ruler { position: absolute; top: .35rem; bottom: .35rem; left: 50%; width: 2.05rem; border-left: 2px solid var(--brass); border-right: 1px solid color-mix(in srgb, var(--brass) 50%, transparent); background: repeating-linear-gradient(180deg, transparent 0, transparent calc(1% - 1px), color-mix(in srgb, var(--brass) 24%, transparent) calc(1% - 1px), color-mix(in srgb, var(--brass) 24%, transparent) 1%), repeating-linear-gradient(180deg, transparent 0, transparent calc(10% - 1px), color-mix(in srgb, var(--brass) 58%, transparent) calc(10% - 1px), color-mix(in srgb, var(--brass) 58%, transparent) 10%); }
.ruler-base { position: absolute; top: 0; bottom: 0; left: 50%; border-left: 1px solid var(--brass); }
.ruler-mark { position: absolute; top: var(--vertical-position); left: -.62rem; width: 3.2rem; height: 1px; background: var(--brass); transform: translateY(-50%); transition: opacity .25s, width .25s, background .25s; }
.ruler-mark[data-revealed="false"] { opacity: .34; }
.ruler-mark::before { content: ""; position: absolute; top: -.17rem; left: .42rem; width: .34rem; height: .34rem; border: 1px solid var(--surface); border-radius: 50%; background: var(--brass); box-shadow: 0 0 0 1px var(--brass); }
.ruler-mark[data-ghost="true"], .ruler-mark.is-ghost { opacity: .48; background: repeating-linear-gradient(90deg, var(--line) 0, var(--line) 3px, transparent 3px, transparent 6px); }
.ruler-mark[data-ghost="true"]::before, .ruler-mark.is-ghost::before { border-radius: 0; background: var(--surface); }
.ruler-mark.is-active { width: 3.65rem; opacity: 1; background: var(--accent); }
.ruler-mark.is-active::before { background: var(--accent); box-shadow: 0 0 0 2px var(--surface), 0 0 0 3px var(--accent); }
.ruler-labels { display: flex; flex-direction: column; justify-content: space-around; gap: .15rem; margin: 0; padding: 0; list-style: none; }
.ruler-labels li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .05rem .35rem; align-content: center; min-width: 0; padding: .2rem .1rem .2rem .45rem; border-bottom: 1px solid color-mix(in srgb, var(--brass) 16%, transparent); color: var(--muted); font-size: .75rem; line-height: 1.35; transition: color .25s, border-color .25s; }
.ruler-labels li[data-revealed="false"] { border-bottom-style: dotted; }
.ruler-labels li.is-active { color: var(--ink); border-bottom-color: var(--brass); font-weight: 700; }
.ruler-author { min-width: 0; }
.ruler-year { color: var(--brass); font: 600 .67rem/1.4 var(--mono); white-space: nowrap; }
.ruler-description { grid-column: 1 / -1; color: var(--muted); font-size: .69rem; line-height: 1.3; }
.ruler-labels .ruler-value { grid-column: 1 / -1; font: 600 .68rem/1.3 var(--mono); font-variant-numeric: tabular-nums; }
.ghost-tag { grid-column: 1 / -1; color: var(--brass); font: 600 .59rem/1.2 var(--mono); }
.ruler-pair { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: .35rem; align-items: center; margin: .75rem 0 0; padding: .55rem .15rem; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); color: var(--muted); font-size: .68rem; transition: opacity .25s; }
.ruler-pair[data-revealed="false"] { opacity: .65; }
.ruler-pair .pair-link { color: var(--brass); font: 600 .61rem/1.2 var(--mono); text-align: center; text-transform: uppercase; letter-spacing: .035em; }
.ruler-pair span:not(.pair-link) { display: grid; gap: .14rem; min-width: 0; text-align: center; }
.ruler-pair b { color: var(--ink); font: 650 .7rem/1.3 var(--mono); }
.ruler-pair small { color: var(--muted); font-size: .62rem; line-height: 1.3; }
.calc-marker { position: absolute; z-index: 2; top: var(--vertical-position); left: -.5rem; width: 3rem; height: 2px; background: var(--plot-blue); transform: translateY(-50%); }
.calc-marker::after { content: ""; position: absolute; left: -.22rem; top: -.2rem; border: .22rem solid transparent; border-left-color: var(--plot-blue); }

.plot-figure { margin: 1rem 0 0; }
.plot-wrap { overflow: hidden; border: 1px solid var(--line); background-color: var(--plot-paper); background-image: linear-gradient(to right, color-mix(in srgb, var(--plot-grid) 76%, transparent) 1px, transparent 1px), linear-gradient(to bottom, color-mix(in srgb, var(--plot-grid) 76%, transparent) 1px, transparent 1px), linear-gradient(to right, color-mix(in srgb, var(--plot-grid) 34%, transparent) 1px, transparent 1px), linear-gradient(to bottom, color-mix(in srgb, var(--plot-grid) 34%, transparent) 1px, transparent 1px); background-size: 4rem 4rem, 4rem 4rem, .8rem .8rem, .8rem .8rem; box-shadow: inset 0 0 0 5px color-mix(in srgb, var(--brass) 12%, transparent), 0 10px 24px color-mix(in srgb, var(--ink) 9%, transparent); }
.period-plot { display: block; width: 100%; height: auto; aspect-ratio: 960 / 560; overflow: visible; }
.plot-axis { stroke: var(--ink); stroke-width: 2; vector-effect: non-scaling-stroke; }
.plot-grid { stroke: var(--plot-grid); stroke-width: 1; opacity: .55; vector-effect: non-scaling-stroke; }
.plot-grid-major { opacity: .8; }
.plot-fit { fill: none; stroke-width: 4; stroke-linecap: round; vector-effect: non-scaling-stroke; stroke-dasharray: 1 1; opacity: 0; transition: opacity .25s; }
.plot-fit.ready { opacity: .85; stroke-dasharray: none; }
.plot-fit.max { stroke: var(--plot-blue); }
.plot-fit.min { stroke: var(--plot-ochre); stroke-dasharray: 8 7; }
.plot-point { stroke: var(--plot-paper); stroke-width: 2; vector-effect: non-scaling-stroke; transform-box: fill-box; transform-origin: center; filter: drop-shadow(0 1px 1px color-mix(in srgb, var(--ink) 42%, transparent)); }
.plot-point.max { fill: var(--plot-blue); }
.plot-point.min { fill: var(--plot-ochre); }
.plot-point.pulse { animation: star-pulse var(--pulse-duration, 2.2s) ease-in-out infinite; }
.plot-point.drop { animation: star-drop .28s var(--drop-delay, 0s) both, star-pulse var(--pulse-duration, 2.2s) .3s ease-in-out infinite; }
.plot-empty { fill: var(--muted); font: italic 20px var(--serif); }
#period-plot[data-started="true"] .plot-empty { display: none; }
@keyframes star-drop { from { opacity: .2; transform: translateY(-10px) scale(.8); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes star-pulse { 50% { scale: 1.035; } }
.plot-axis-label { fill: var(--muted); font: 18px var(--ui); }
.plot-legend { display: flex; flex-wrap: wrap; gap: .8rem 1.5rem; margin: .75rem 0 0; color: var(--muted); font-size: .82rem; }
.plot-note { margin: .45rem 0 0; color: var(--muted); font-size: .8rem; }
.legend-item { display: inline-flex; align-items: center; gap: .45rem; }
.legend-mark { display: inline-block; width: .72rem; height: .72rem; border: 2px solid currentColor; border-radius: 50%; }
.legend-mark.max { color: var(--plot-blue); }
.legend-mark.min { color: var(--plot-ochre); border-radius: 0; }
.point-controls { margin: 1.2rem 0 0; padding: .85rem; border-left: 2px solid var(--brass); background: color-mix(in srgb, var(--brass) 6%, var(--surface)); }
.plot-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .6rem; }
.plot-actions .action-btn { min-height: 2.9rem; }
.plot-actions .action-primary { border-color: var(--brass); background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.plot-actions .action-primary:hover { background: color-mix(in srgb, var(--accent) 88%, var(--surface)); }
.action-btn:disabled { opacity: .5; cursor: default; }
.keyboard-note { margin: .45rem 0 0; color: var(--muted); font-size: .74rem; }
.point-status, .fit-status, .game-status, .calc-status, .calc-note { min-height: 1.55em; margin: .55rem 0 0; color: var(--muted); font-size: .9rem; }
.calc-note { border-left: 2px solid var(--brass); padding: .35rem .65rem; }
.fit-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; margin-top: 1rem; }
.fit-card { min-width: 0; padding: .8rem; border: 1px solid var(--line-soft); }
.fit-card h4 { margin: 0 0 .4rem; font: 600 .73rem/1.35 var(--mono); color: var(--muted); }
.fit-card output { display: block; font: 600 1rem/1.45 var(--mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.fit-card p { margin: .45rem 0 0; color: var(--muted); font-size: .82rem; }
.fit-comparison { margin: .8rem 0 0; padding: .6rem .8rem; border-left: 2px solid var(--brass); background: color-mix(in srgb, var(--brass) 7%, var(--surface)); color: var(--ink); font: 550 .8rem/1.5 var(--mono); font-variant-numeric: tabular-nums; }
.table-details { margin-top: 1rem; }
.table-details summary { width: fit-content; cursor: pointer; color: var(--accent); text-decoration: underline; text-underline-offset: .18em; }
.data-table-wrap { max-width: 100%; overflow-x: auto; margin-top: .8rem; border: 1px solid var(--line-soft); }
.data-table { width: 100%; border-collapse: collapse; font: .78rem/1.35 var(--mono); font-variant-numeric: tabular-nums; }
.data-table th, .data-table td { padding: .45rem .6rem; text-align: right; border-bottom: 1px solid var(--line-soft); white-space: nowrap; }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th { color: var(--muted); background: color-mix(in srgb, var(--accent) 7%, var(--surface)); }

.field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .9rem; }
.field { display: grid; gap: .35rem; min-width: 0; }
.field label { color: var(--muted); font-size: .84rem; font-weight: 650; }
.field select, .field input { width: 100%; min-width: 0; min-height: 2.8rem; border: 1px solid var(--line); border-radius: 0; padding: .5rem .65rem; background: var(--surface-raised); color: var(--ink); }
.field input[type="range"] { padding: 0; accent-color: var(--accent); }
.calc-result { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin-top: 1rem; }
.result-cell { padding: .85rem; border-top: 2px solid var(--brass); background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.result-cell span { display: block; color: var(--muted); font-size: .78rem; }
.result-cell output { display: block; margin-top: .2rem; font: 600 1.12rem/1.35 var(--mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.calc-check { margin: .85rem 0 0; padding: .7rem .85rem; border-left: 3px solid var(--brass); background: color-mix(in srgb, var(--brass) 8%, var(--surface)); color: var(--muted); font-size: .86rem; }
.calc-check[data-match="true"] { color: var(--ink); }
.calc-check[data-match="false"] { border-color: var(--plot-ochre); }

.timeline-question { margin: 1.2rem 0; padding: 1rem; background: color-mix(in srgb, var(--accent) 5%, var(--surface)); border-left: 3px solid var(--brass); }
.timeline-options, .credit-options { display: grid; gap: .5rem; }
.choice-btn, .action-btn { width: 100%; min-width: 0; min-height: 2.75rem; padding: .65rem .8rem; border: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); text-align: left; cursor: pointer; }
.choice-btn:hover, .action-btn:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.choice-btn[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 3px 0 var(--accent); }
.timeline-list { margin: 1.6rem 0 0; padding: 0; list-style: none; border-left: 1px solid var(--brass); }
.timeline-item { position: relative; margin-left: 1.05rem; padding: 0 0 1.3rem 1rem; }
.timeline-item::before { content: ""; position: absolute; left: calc(-1.05rem - 4px); top: .4rem; width: .45rem; height: .45rem; border-radius: 50%; border: 1px solid var(--surface); background: var(--brass); box-shadow: 0 0 0 1px var(--brass); }
.timeline-date { display: block; margin: 0 0 .15rem; color: var(--brass); font: 650 .72rem/1.4 var(--mono); }
.timeline-item h4 { margin: 0; font: 650 .95rem/1.45 var(--ui); }
.timeline-item p { margin: .2rem 0 0; color: var(--muted); font-size: .84rem; }
.timeline-item a { display: inline-block; margin-top: .25rem; font-size: .8rem; }
.credit-card { margin-top: .8rem; padding: .9rem; border-top: 1px solid var(--line-soft); }
.credit-card:first-child { border-top: 0; }
.credit-card h4 { margin: 0 0 .35rem; font: 600 .94rem/1.4 var(--ui); }
.credit-card p { margin: 0 0 .7rem; color: var(--muted); font-size: .82rem; }
.credit-card select { width: 100%; min-width: 0; min-height: 2.7rem; padding: .45rem .6rem; border: 1px solid var(--line); background: var(--surface-raised); color: var(--ink); }
.credit-result { min-height: 1.45em; margin: .45rem 0 0; color: var(--muted); font-size: .82rem; }
.credit-scoreboard { margin-top: 1rem; padding: .85rem 1rem; border-top: 2px solid var(--brass); background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.credit-scoreboard p { margin: .25rem 0; }
.credit-scoreboard output, .credit-scoreboard strong { font-weight: 700; }

.sources { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line-soft); }
.related-note { margin-top: 2rem; padding: 1rem 1.15rem; border: 1px solid var(--line); border-left: 3px solid var(--brass); background: color-mix(in srgb, var(--surface) 75%, transparent); }
.related-note .micro-label { margin: 0 0 .35rem; }
.related-note h2 { margin: 0 0 .45rem; font: 600 clamp(1.2rem, 2.5vw, 1.55rem)/1.2 var(--serif); }
.related-note p:last-child { margin-bottom: 0; }
.source-list { margin: 1rem 0 0; padding-left: 1.2rem; }
.source-list li { padding: .35rem 0; }
.source-list cite { font-style: normal; }
.source-list a { overflow-wrap: anywhere; }
footer { max-width: 75rem; margin: 0 auto; padding: 2rem clamp(1.1rem, 4vw, 3.5rem) 3rem; border-top: 1px solid var(--line-soft); color: var(--muted); font-size: .82rem; }

.rail { display: none; }
@media (min-width: 1400px) {
  .rail { --col: 75rem; --gut: .5rem; display: flex; flex-direction: column; position: fixed; top: 50%; left: calc(50% + var(--col) / 2 + var(--gut)); transform: translateY(-50%); z-index: 40; margin: 0; padding: .4rem 0; max-height: calc(100vh - 7rem); }
  .rail::before { content: ""; position: absolute; left: calc(.875rem - .5px); top: 1.1rem; bottom: 1.1rem; width: 1px; background: var(--line); }
  .rail-dot { position: relative; display: flex; align-items: center; justify-content: center; width: 1.75rem; height: 1.75rem; border-radius: 50%; text-decoration: none; }
  .rail-dot .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); box-shadow: 0 0 0 3px var(--paper); flex: none; transition: transform .2s, background .2s, box-shadow .2s; }
  .rail-dot:hover .dot, .rail-dot:focus-visible .dot { background: var(--accent); transform: scale(1.25); }
  .rail-dot[aria-current="location"] .dot { background: var(--accent); transform: scale(1.45); box-shadow: 0 0 0 3px var(--paper), 0 0 0 4.5px color-mix(in srgb, var(--accent) 38%, transparent); }
  .rail-dot:focus-visible { outline: 2px solid var(--accent); outline-offset: -1px; }
  .rail-label { position: absolute; right: calc(100% + .3rem); top: 50%; transform: translate(6px, -50%); padding: .22rem .65rem; border: 1px solid var(--line); border-radius: .4rem; background: var(--surface); color: var(--ink); box-shadow: var(--shadow); font-size: .8rem; font-weight: 650; line-height: 1.3; white-space: nowrap; opacity: 0; pointer-events: none; transition: opacity .15s, transform .15s; }
  .rail-dot:hover .rail-label, .rail-dot:focus-visible .rail-label { opacity: 1; transform: translate(0, -50%); }
  .rail-label { right: auto; left: calc(100% + .15rem); max-width: calc(50vw - var(--col) / 2 - var(--gut) - 3.25rem); overflow: hidden; text-overflow: ellipsis; padding: .1rem .2rem; border-color: transparent; background: transparent; box-shadow: none; color: var(--muted); transform: translate(-4px, -50%); }
  .rail-dot[aria-current="location"] .rail-label { opacity: 1; color: var(--ink); transform: translate(0, -50%); }
  .rail-dot:hover .rail-label, .rail-dot:focus-visible .rail-label { color: var(--accent); }
}

@media (prefers-reduced-motion: reduce) { .rail .dot, .rail-label { transition: none; } }
@media (forced-colors: active) { .rail::before { background: CanvasText; } .rail-dot .dot { background: CanvasText; box-shadow: none; } .rail-dot[aria-current="location"] .dot { background: Highlight; } .rail-label { border-color: CanvasText; } }

.share { --sr-line: var(--line-soft); --sr-ink: var(--ink); --sr-acc: var(--accent); --sr-ok: var(--muted); margin-top: 2rem; }
.share-row .lab { font: 500 .86rem/1.3 var(--ui); color: var(--muted); }
.share-status { color: var(--muted); }
.to-top { position: fixed; z-index: 45; right: max(1rem, env(safe-area-inset-right)); bottom: max(1rem, env(safe-area-inset-bottom)); min-width: 2.75rem; min-height: 2.75rem; padding: 0 .7rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface-raised); color: var(--ink); box-shadow: var(--shadow); font: 650 .8rem/1 var(--ui); cursor: pointer; }

@media (max-width: 1150px) {
  .story-layout { grid-template-columns: 8.5rem minmax(0, 1fr); gap: 1.15rem; max-width: 70rem; padding-top: 2rem; }
  .visual-rail { top: calc(var(--bar-h) + .7rem); grid-column: 1; grid-row: 1; padding: .75rem .55rem; }
  .visual-rail > p { display: none; }
  .ruler-assembly { grid-template-columns: 2.15rem minmax(0, 1fr); gap: .35rem; min-height: 67vh; }
  .ruler-frame { min-height: 22rem; }
  .ruler-labels li { padding-left: .2rem; font-size: .65rem; }
  .ruler-description, .ruler-value, .ghost-tag { display: none; }
  .ruler-pair { grid-template-columns: 1fr; gap: .1rem; text-align: center; }
  .ruler-pair .pair-link { order: 0; }
  .ruler-pair [data-pair-side="0"] { order: -1; }
  .ruler-pair [data-pair-side="1"] { order: 1; }
  .ruler-pair small { display: none; }
  .story { grid-column: 2; grid-row: 1; }
  .intro { min-height: 54vh; }
}

@media (max-width: 620px) {
  :root { --bar-h: 3.25rem; --ruler-strip-h: 2.75rem; }
  .topbar { display: flex; align-items: center; gap: .22rem; height: var(--bar-h); padding: .2rem .45rem; font-size: .81rem; }
  .home { display: flex; flex: 0 0 2rem; align-items: center; justify-content: center; height: 2.3rem; width: 2rem; overflow: hidden; font-size: 0; }
  .home::after { content: "MC"; color: var(--ink); font-size: .74rem; font-weight: 750; letter-spacing: -.04em; }
  .topnav { display: flex; flex: 1 1 auto; grid-area: auto; justify-content: space-between; width: auto; max-width: none; gap: 0; }
  .topnav a { display: flex; flex: 0 0 auto; min-height: 44px; align-items: center; justify-content: center; padding: .3rem .14rem; font-size: .67rem; white-space: nowrap; }
  .top-spacer { display: none; }
  .language-link { display: flex; flex: 0 0 auto; align-items: center; height: 2.2rem; min-height: 2.2rem; padding: 0 .35rem; font-size: .7rem; }
  .icon-btn { width: 2.15rem; height: 2.15rem; }
  .visual-rail { position: fixed; z-index: 51; top: var(--bar-h); left: 0; right: 0; display: flex; align-items: center; gap: .2rem; width: auto; height: var(--ruler-strip-h); max-height: var(--ruler-strip-h); overflow: hidden; padding: .1rem .35rem; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"]) { height: 4px; max-height: 4px; overflow: visible; padding: 0; border: 0; background: transparent; box-shadow: none; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"])::before { content: ""; position: absolute; z-index: 1; inset: 0 0 auto; height: 4px; background: var(--brass); pointer-events: none; }
  .visual-rail h2 { display: none; }
  .ruler-toggle { display: inline-flex; flex: 0 0 auto; align-items: center; justify-content: center; gap: .2rem; min-width: 3.1rem; min-height: 2.5rem; padding: .25rem .3rem; border: 0; border-radius: .25rem; background: transparent; color: var(--ink); font: 650 .62rem/1.15 var(--ui); cursor: pointer; }
  .ruler-toggle:hover, .ruler-toggle:focus-visible { background: color-mix(in srgb, var(--accent) 9%, transparent); }
  .ruler-toggle-mark { color: var(--brass); font: 700 .9rem/1 var(--mono); }
  .ruler-details { display: flex; flex: 1 1 auto; align-items: center; min-width: 0; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"]) .ruler-details { visibility: hidden; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"]) .ruler-toggle { position: absolute; z-index: 2; top: 0; left: 0; width: 100%; min-width: 0; height: 44px; min-height: 44px; padding: 0; color: transparent; background: transparent; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"]) .ruler-toggle span { visibility: hidden; }
  .visual-rail[data-scrolled="true"]:not([data-expanded="true"]) .ruler-toggle:focus-visible { outline-offset: -3px; }
  .visual-rail > .ruler-details > p { display: none; }
  .visual-rail:not([data-expanded="true"]) .ruler-labels,
  .visual-rail:not([data-expanded="true"]) .ruler-pair { display: none; }
  .visual-rail:not([data-expanded="true"]) .ruler-assembly { display: block; flex: 1 1 auto; min-height: 0; margin: 0; }
  .visual-rail:not([data-expanded="true"]) .ruler-frame { height: 1.45rem; min-height: 0; margin: 0; }
  .visual-rail[data-expanded="true"] { z-index: 52; height: var(--ruler-strip-h); max-height: var(--ruler-strip-h); overflow: visible; }
  .visual-rail[data-expanded="true"] .ruler-toggle { position: relative; z-index: 2; background: var(--surface); }
  .visual-rail[data-expanded="true"] .ruler-details { position: absolute; z-index: 1; top: 100%; left: 0; right: 0; display: block; max-height: calc(100vh - var(--bar-h) - var(--ruler-strip-h) - .5rem); overflow: auto; padding: .25rem .45rem .5rem; border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow); }
  .visual-rail[data-expanded="true"] .ruler-assembly { display: block; min-height: 0; margin: .25rem 0 0; }
  .visual-rail[data-expanded="true"] .ruler-frame { height: 1.7rem; min-height: 0; margin: 0; }
  .visual-rail[data-expanded="true"] .ruler-labels { display: grid; }
  .visual-rail[data-expanded="true"] .ruler-pair { display: grid; }
  .visual-rail[data-expanded="true"] .ruler-labels li { min-height: 1.5rem; }
  .ruler-frame::before { inset: .1rem; }
  .log-ruler { top: .13rem; bottom: .13rem; left: 0; right: 0; width: auto; border: 0; border-top: 2px solid var(--brass); border-bottom: 1px solid color-mix(in srgb, var(--brass) 55%, transparent); background: repeating-linear-gradient(90deg, transparent 0, transparent calc(1% - 1px), color-mix(in srgb, var(--brass) 22%, transparent) calc(1% - 1px), color-mix(in srgb, var(--brass) 22%, transparent) 1%), repeating-linear-gradient(90deg, transparent 0, transparent calc(10% - 1px), color-mix(in srgb, var(--brass) 55%, transparent) calc(10% - 1px), color-mix(in srgb, var(--brass) 55%, transparent) 10%); }
  .ruler-base { top: 50%; bottom: auto; left: 0; right: 0; border: 0; border-top: 1px solid var(--brass); }
  .ruler-mark { top: -.28rem; left: var(--position); width: 1px; height: 1.8rem; transform: translateX(-50%); }
  .ruler-mark::before { top: .32rem; left: -.16rem; width: .3rem; height: .3rem; }
  .ruler-mark.is-active { top: -.3rem; left: var(--position); width: 2px; height: 1.95rem; transform: translateX(-50%); }
  .ruler-mark.is-active::before { top: .35rem; left: -.15rem; }
  .calc-marker { top: -.2rem; left: var(--position); width: 1.65rem; height: 2px; transform: translateX(-50%); }
  .calc-marker::after { left: auto; right: -.16rem; top: -.19rem; border: .2rem solid transparent; border-right-color: var(--plot-blue); }
  .ruler-labels { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .06rem .1rem; margin: .06rem 0 0; }
  .ruler-labels li { display: flex; flex-direction: column; justify-content: center; gap: 0; min-width: 0; padding: .03rem .08rem; border: 0; border-left: 1px solid color-mix(in srgb, var(--brass) 35%, transparent); line-height: 1; }
  .ruler-labels li.is-active { border-left-color: var(--accent); }
  .ruler-author { overflow: hidden; font-size: 0; letter-spacing: -.02em; text-overflow: clip; white-space: nowrap; }
  .ruler-author::after { content: attr(data-mobile-author); display: block; overflow: hidden; color: var(--ink); font: 600 .52rem/1 var(--ui); text-overflow: clip; white-space: nowrap; }
  .ruler-year { font-size: .4rem; line-height: 1.05; }
  .ruler-description, .ruler-value, .ghost-tag { display: none; }
  .ruler-pair { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: .16rem; margin: .08rem 0 0; padding: .1rem 0 0; border-bottom: 0; font-size: .5rem; }
  .ruler-pair .pair-link { font-size: .44rem; }
  .ruler-pair b { overflow: hidden; font-size: 0; white-space: nowrap; }
  .ruler-pair b::after { content: attr(data-compact); font: 650 .44rem/1.2 var(--mono); white-space: nowrap; }
  .ruler-pair small { display: none; }
  .story-layout { display: block; max-width: 52rem; padding: 1.3rem .9rem 3rem; }
  .story { min-width: 0; }
  .intro { min-height: 56vh; padding-bottom: 2rem; }
  h1 { font-size: clamp(2.65rem, 12vw, 4.1rem); }
  .dek { font-size: 1.12rem; }
  .chapter { padding-block: 2.5rem 3.5rem; }
  .interaction { margin-inline: -.15rem; padding: .9rem; }
  .fit-grid, .field-row, .calc-result { grid-template-columns: 1fr; }
  .plot-axis-label { font-size: 22px; }
  .plot-note { margin: .4rem 0 0; }
  .share-row { gap: .25rem; }
  .plot-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .35rem; }
  .plot-actions .action-btn { min-height: 2.75rem; padding: .45rem .35rem; font-size: .78rem; line-height: 1.2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .plot-point.pulse, .plot-point.drop { animation: none !important; }
}
@media print {
  .topbar, .rail, .visual-rail, .share, .action-btn, .point-controls, .timeline-question { display: none !important; }
  .story-layout { display: block; max-width: none; padding: 0; }
  .chapter { break-inside: avoid; }
  body { background: white; color: black; }
  a { color: black; }
}


/* share row (standards/v2/tools/share_row.py) */
.share-row{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center}
.share-row .lab{font-size:.95rem;opacity:.8;margin-right:.3rem}
.share-row a,.share-row button{display:inline-grid;place-items:center;flex:none;width:2.5rem;height:2.5rem;padding:0;border-radius:50%;border:1px solid var(--sr-line,color-mix(in srgb,currentColor 28%,transparent));background:transparent;color:var(--sr-ink,inherit);text-decoration:none;cursor:pointer;font:inherit;transition:color .15s,border-color .15s}
.share-row a:hover,.share-row button:hover,.share-row a:focus-visible,.share-row button:focus-visible{color:var(--sr-acc,inherit);border-color:var(--sr-acc,currentColor)}
.share-row [hidden]{display:none}
@media (pointer:coarse){.share-row a,.share-row button{width:2.75rem;height:2.75rem}}
@media (max-width:30rem){.share-row .lab{flex-basis:100%;margin:0 0 .15rem}}
.share-status{font-size:.92rem;color:var(--sr-ok,inherit);min-height:1.2em;margin:.4rem 0 0}
.share-field{display:block;width:100%;max-width:36rem;margin-top:.4rem;font:inherit;font-size:.9rem}