/* Token system: "Two inks" look (DESIGN.md, 2026-10-29).
   main.js reads CSS vars into window.THEME at startup; modules read THEME, never the CSS variables.
   Grouped by role (DESIGN.md palette table). */
:root {
  /* --- surface and text --- */
  --paper: #F7F3EC;
  --bg: var(--paper);
  --ink: #1E1B22;
  --muted: #5D5862;
  --rule: #D9D2C7;

  /* --- two inks --- */
  --ink-a: #EA8A00;              /* amber: exposure and extra fuel cost */
  --ink-a-deep: #B86A00;         /* amber for small marks and strokes: 3.72:1 on paper */
  --ink-b: #5E36C9;              /* violet: prices */
  --overprint: #561D00;          /* A over B at full strength */

  /* --- accent (what the comparison uses) --- */
  --accent: #0F6B66;
  --accent-soft: #D5E8E4;

  /* --- partisan direction --- */
  --rep: #B2423A;
  --dem: #2F5D9B;

  /* --- burden ramp (single-ink exposure and extra-fuel-cost) --- */
  --burden-0: #F5E2BF;          /* light end */
  --burden-1: #EA8A00;          /* mid (= ink-a) */
  --burden-2: #561D00;          /* dark end (= overprint) */

  /* --- price ramp (violet) and low price (slate) --- */
  --price-0: #E9E2F8;           /* soft violet */
  --price-1: #5E36C9;           /* main violet (= ink-b) */
  --price-low: #6E7486;         /* slate */

  /* --- diverge ramp (price deviations: violet above, slate below) --- */
  --diverge-pos: #5E36C9;
  --diverge-mid: #EEE9E1;
  --diverge-neg: #6E7486;

  /* --- set-aside (warm grays) --- */
  --setaside-1: #8E8780;
  --setaside-2: #CFC8BD;

  /* --- region identity (PADD_COLORS, chroma reduced ~15%) --- */
  --padd-1a: #6A7D9E;           /* New England */
  --padd-1b: #4D939F;           /* Central Atlantic */
  --padd-1c: #7A9E76;           /* Lower Atlantic */
  --padd-2:  #B89D58;           /* Midwest */
  --padd-3:  #AD7558;           /* Gulf Coast */
  --padd-4:  #93769E;           /* Rocky Mountain */
  --padd-5:  #5C886A;           /* West Coast */

  /* --- figure-specific roles (re-derived in warm-gray / palette) --- */
  --fig-set-aside: #8E8780;     /* warm gray: what exposure alone predicts (= setaside-1) */
  --fig-adj: #3D3840;           /* the four adjustments (warm dark) */
  --fig-rust: #6E7486;          /* negative deviations (= price-low slate) */
  --fig-plum: #6E5CA0;          /* v6 adjustments colour (warmer violet) */
  --fig-amber: #EA8A00;         /* v6 exposure-alone colour (= ink-a) */
  --fig-calm: #918A84;          /* calm neutral in dot key (warm) */
  --fig-pale: #CFC8BD;          /* pale neutral for dot key (= setaside-2) */
  --fig-grey-bar: #C2BAB0;      /* charts.js bar background (warm) */

  /* --- market-kind colours (warm neutrals) --- */
  --fig-metro: #48526A;
  --fig-metro-fill: #DDD8EE;
  --fig-micro: #A87A1E;
  --fig-micro-fill: #F3E5C5;
  --fig-rural: #5E8656;
  --fig-rural-fill: #DCE6D4;

  /* --- strip alternation (warm grays) --- */
  --fig-strip-0: #5D5862;
  --fig-strip-1: #A09A93;

  /* --- scrollbar (warm) --- */
  --scrollbar: #B5AFA6;
  --scrollbar-hover: #918A84;

  /* --- text highlights (matched to figure legends) --- */
  --hl-zero: #EBE6DF;           /* close to zero (warm) */
  --hl-effect: #D5E8E4;         /* a clear effect (= accent-soft) */
  --text-burden-hi: #561D00;    /* overprint, used in text .k-hi */
  --text-burden-lo: #9A5300;    /* ochre for burden light end in text .k-lo */
  --text-price: #5E36C9;        /* price violet in text .k-m2 (= ink-b) */

  /* --- red ramp (vis_dots partisanship placebo, warm) --- */
  --fig-red-0: #F5E4E0;
  --fig-red-1: #D0807A;
  --fig-red-2: #832520;

  /* --- equation boxes (warm grays) --- */
  --fig-eq-out: #7A7470;
  --fig-eq-race: #AEA8A0;

  /* --- misc figure greys (warm) --- */
  --fig-bar-alt-0: #CFC8BD;     /* adjustment strip even (= setaside-2) */
  --fig-bar-alt-1: #DDD8D0;     /* adjustment strip odd */
  --fig-inkg-line: #CFC8BD;     /* equation glyph lanes */
  --fig-faded-bar: #AEA8A0;     /* comparison bar faded */
  --fig-overview-mut: #968F88;  /* overview tile muted (warm) */
  --fig-amber-dark: #8A4A12;    /* dark amber for state highlight */
  --fig-glyph-soft: #D9D2C7;    /* overview glyph light gray (= rule) */

  /* --- fonts: Vollkorn (body/display) + Barlow (labels) --- */
  --font-body: Vollkorn, Charter, 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --font-display: Vollkorn, Georgia, serif;
  --font-label: Barlow, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  /* Canvas and SVG measurement stacks */
  --font-label-canvas: Barlow, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-label-short: Barlow, system-ui, sans-serif;
  --font-label-charts: "Barlow", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif-canvas: Vollkorn, Georgia, serif;
  --font-serif-full: Vollkorn, Georgia, serif;
  --font-label-face: "Barlow";
  --font-fallback: sans-serif;
  /* aliases */
  --serif: var(--font-body);
  --sans: var(--font-label);

  /* Roller multipliers */
  --dot-scale: 1;
  --dot-alpha: 1;
  --dot-stroke: 1.1;            /* DESIGN.md: outlined dots by default */
  --dot-halftone: 0;
  --label-weight: 600;
  --chart-weight: 2.8;          /* DESIGN.md: about 1.4x today's 2 */
  --grain-opacity: 0;
  --grain-freq: 0;
  --on-accent: #ffffff;

  /* --- interface effects (re-derived from palette) --- */
  --tap-highlight: rgba(15, 107, 102, .15);
  --link-underline: rgba(15, 107, 102, .45);
  --ink-shadow-soft: rgba(30, 27, 34, .12);
  --tooltip-shadow: rgba(30, 27, 34, .22);
  --menu-shadow: rgba(30, 27, 34, .14);
  --overview-tap-highlight: rgba(15, 107, 102, .12);
  --overview-hover-shadow: rgba(15, 107, 102, .16);
  --mask-opaque: #000;
  --overview-read-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='8' fill='%230F6B66'/%3E%3Cpath d='M4 8l3 3 5-6' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");

  /* --- layout --- */
  --measure: 34rem;
  --bar-h: 2.75rem;             /* taller bar for labels-above-line part bar */
  --tp-overlap: 40svh;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { background: var(--bg); scrollbar-color: var(--scrollbar) var(--bg); scrollbar-width: thin; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--serif); font-size: 1.1875rem; line-height: 1.6; font-optical-sizing: auto; caret-color: var(--accent); -webkit-tap-highlight-color: var(--tap-highlight); }
::selection { background: var(--accent-soft); color: var(--ink); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border: 2px solid var(--bg); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
a { color: var(--accent); text-decoration-line: underline; text-decoration-thickness: 1px; text-decoration-color: var(--link-underline); text-underline-offset: .2em; }
a:hover { text-decoration-color: currentColor; text-decoration-thickness: 1.5px; }
h1, h2 { text-wrap: balance; font-weight: 600; margin: 0; }
p { text-wrap: pretty; }
em { font-style: italic; }

.skip { position: absolute; left: .75rem; top: -4rem; z-index: 100; background: var(--ink); color: var(--bg); font: 500 .875rem var(--sans); padding: .5rem .75rem; border-radius: 3px; }
.skip:focus { top: .75rem; }
.noscript { padding: 1rem 1.5rem; font: 400 .9375rem var(--sans); color: var(--muted); }

/* ---------- title page ---------- */
/* One screen: name, question, lede and author on the left, the map with its key and the "Scroll to begin" cue on the right (desktop);
   on a phone the order is name, question, map, lede, author, cue. The map itself is drawn on the fixed canvas #tp-map (main.js); .tp-stage only
   holds its place in the flow. The story below overlaps the bottom of this block by --tp-overlap (see #story), so the first beat arrives while the
   map is still handing over to the panel instead of after a blank stretch. */
.tp { position: relative; z-index: 7; pointer-events: none; display: grid; grid-template-columns: minmax(0, 1fr); align-content: start; min-height: 100vh; min-height: 100svh;
  padding: clamp(1.25rem, 4svh, 2.5rem) clamp(1.25rem, 5vw, 4.5rem) 0; }
.tp a, .tp-name, .tp-side { pointer-events: auto; }
@media (max-width: 899px) { .tp { z-index: 11; } }   /* on a phone the title page lies over the sticky figure panel (#visual, z-index 10), or the panel takes the taps on its links */
.tp-name, .tp-side { opacity: var(--tp-text, 1); }
.titlepage { display: contents; }
/* v7: the question is the title; "Two inks" variant A: Vollkorn 600, tight leading, heavy rule */
.tp-name { grid-row: 1; font-family: var(--font-display); font-size: clamp(1.625rem, 6.6vw, 2.25rem); line-height: 1.04; letter-spacing: -.018em; font-weight: 600; text-wrap: balance; padding-bottom: .9rem; margin-bottom: clamp(1rem, 3svh, 2rem); border-bottom: 4px solid var(--ink); }
.tp-side { grid-row: 4; padding-top: 1.25rem; }
/* phone (critique T2): main.js sets --tp-cut, the map's lower edge in the block's own coordinates; the lines above it are under the map and are cut off */
.tp-side { -webkit-mask-image: linear-gradient(to bottom, transparent calc(var(--tp-cut, -100px) - 14px), var(--mask-opaque) var(--tp-cut, -100px)); mask-image: linear-gradient(to bottom, transparent calc(var(--tp-cut, -100px) - 14px), var(--mask-opaque) var(--tp-cut, -100px)); }
.tp-lede { font-size: 1.0625rem; line-height: 1.52; max-width: var(--measure); margin: 0 0 .9rem; text-wrap: pretty; overflow-wrap: break-word; }
.tp-author { font: 400 .8125rem/1.55 var(--sans); color: var(--muted); max-width: 40rem; margin: 0; }
.tp-author a { color: var(--ink); text-decoration-color: var(--muted); }
.tp-author a:hover { color: var(--accent); }
.tp-author a.ph { color: var(--muted); text-decoration-style: dotted; }
.tp-hero { grid-row: 3; }
.tp-figure { margin: 0 -1.25rem; width: auto; }
.tp-stage { width: 100%; aspect-ratio: var(--tp-aspect, 1.6); }
.tp-cap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .35rem 2rem; padding: .6rem 1.25rem .2rem; font: 400 .875rem/1.45 var(--sans); color: var(--muted); opacity: var(--tp-capo, 1); }
.tp-key { display: inline-flex; align-items: center; gap: .5rem; white-space: nowrap; }
.tp-ramp { display: inline-block; width: 7.5rem; height: .6rem; border-radius: 1px; background: linear-gradient(90deg, var(--burden-0), var(--burden-1), var(--burden-2)); box-shadow: inset 0 0 0 1px var(--ink-shadow-soft); }
.tp.no-map .tp-figure { display: none; }
.tp-begin { grid-row: 5; justify-self: start; position: relative; display: inline-flex; align-items: center; gap: .6rem; font: 500 .9375rem/1 var(--sans); color: var(--ink); text-decoration: none; padding: .75rem 0 1.5rem; opacity: var(--tp-cue, 1); }
.tp-begin:hover { color: var(--accent); }
.tp.past .tp-begin, .tp.past .tp-cap { visibility: hidden; }
#tp-map { position: fixed; left: 0; top: 0; z-index: 5; pointer-events: none; }
@media (min-width: 900px), (orientation: landscape) and (max-height: 500px) {
  .tp { grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); grid-template-rows: auto auto auto 1fr auto; column-gap: clamp(2rem, 4.5vw, 5rem); padding-top: clamp(1.5rem, 5svh, 3rem); }
  .tp-name { grid-column: 1 / -1; font-size: clamp(2.5rem, 3.6vw, 3.5rem); }
  .tp-side { grid-column: 1; grid-row: 2 / 4; padding-top: clamp(.25rem, 1svh, .75rem); }
  .tp-hero { grid-column: 2; grid-row: 2 / 5; align-self: center; padding-bottom: 2rem; }
  .tp-begin { grid-column: 1; grid-row: 4; align-self: start; }   /* directly under the author block (v7.2) */
  .tp-figure { margin: 0 auto; width: min(100%, 1600px, calc(var(--tp-aspect, 1.6) * (100svh - 13rem))); }
  .tp-cap { padding: .7rem 0 .2rem; }
  .tp-lede { font-size: clamp(1.0625rem, 1.2vw, 1.25rem); }
  .tp-author { font-size: .875rem; }
}
@media (min-width: 1100px) { .tp { grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); } }
/* wide screens: the title keeps growing past 1800px */
@media (min-width: 1800px) {
  .tp-name { font-size: clamp(3.5rem, 3.6vw, 5rem); }
  .tp-lede { font-size: clamp(1.3125rem, 1.15vw, 1.5rem); max-width: 40rem; }
  .tp-author { font-size: 1rem; max-width: 46rem; }
  .tp-begin { font-size: 1.0625rem; }
}
/* short screens: tighter title block so that map, key and cue stay in the first screen */
@media (min-width: 900px) and (max-height: 760px) {
  .tp { padding-top: 1rem; }
  .tp-name { font-size: clamp(1.625rem, 2.6vw, 2.4rem); padding-bottom: .5rem; margin-bottom: .9rem; }
  .tp-side { padding-top: .7rem; }
  .tp-lede { font-size: 1rem; line-height: 1.5; margin-bottom: .6rem; }
  .tp-author { font-size: .8125rem; line-height: 1.5; }
  .tp-begin { padding: .4rem 0 .9rem; }
  .tp-figure { width: min(100%, 1600px, calc(var(--tp-aspect, 1.6) * (100svh - 9.5rem))); }
}


/* ---------- scroll story ---------- */
#story { position: relative; margin-top: calc(-1 * var(--tp-overlap)); }
#layout { display: flex; align-items: flex-start; }
/* the top padding equals the trigger line in main.js (GEOM.desk.trig = 0.78): the first beat becomes current as the panel pins */
#text { position: relative; z-index: 6; flex: 0 0 46%; padding: 112vh 1.5rem 0 1.25rem; }
#visual { font-family: var(--sans); flex: 1 1 auto; position: sticky; top: var(--bar-h); height: 100vh; height: calc(100vh - var(--bar-h)); min-width: 0; border-left: none; background: var(--bg); }
/* v7.2 (critique S6): the drawing area is capped at 1100px and centred; modules read the capped size (state.w) and the title map hands off into it */
#panel { position: absolute; inset: 0; width: min(100%, 1100px); margin-inline: auto; overflow: hidden; }

/* block tops 120vh apart (140vh for dense beats): a build (p 0.05-0.45) gets about 48vh of scroll and ends with the block's top near 24% of the screen.
   A part heading adds no margin: it would lengthen the previous beat, whose build would then end higher on the screen. */
.beat { max-width: 31rem; margin-left: auto; min-height: 120vh; padding-bottom: 30vh; }   /* PI 2026-10-30: the text sits close to the figure */
.beat.long { min-height: 140vh; }
/* beats whose figure runs a long sequence: five reshuffles; four build stages */
#b-test { min-height: 160vh; }   /* v7.2 (critique 6.1): was 200vh */
#b-past-estimates { min-height: 180vh; }
/* v9.4: beats whose figure runs a slow, multi-part animation get more scroll, so the movement is never rushed */
#b-price-local, #b-simple { min-height: 160vh; }
#b-ideal-shuffle, #b-nearby-intro { min-height: 180vh; }
#b-both-sides-remove { min-height: 170vh; }
#b-fluke-reshuffle { min-height: 400vh; }   /* PI 2026-10-29: eight reshuffles at the old pace (was 260vh, five) */
#b-fluke-reshuffle .beat-body { position: sticky; top: 30vh; }   /* PI 2026-10-30: the text holds while the reshuffles run */
.part-title { font-family: var(--font-display); font-size: clamp(1.625rem, 2.4vw, 2.125rem); font-weight: 600; line-height: 1.15; letter-spacing: -.01em; margin: 0 0 1.1rem; max-width: var(--measure); }
.beat-body { max-width: var(--measure); }
.beat-body p { margin: 0 0 1em; }
.beat-body > p { font-size: 1.3125rem; }   /* PI 2026-10-30: the running text only; expandables keep their size */
.beat-body p:last-child { margin-bottom: 0; }
/* the-question (PI, 2026-10-29): the two groups compared take the colors of the extra-fuel-cost legend, dark end and light end. Text color: the
   legend's dark end as is; its light end (--burden-0) is too pale for text, so `less` uses the ramp's orange darkened to an ochre (contrast about 5:1). */
.k-hi { color: var(--text-burden-hi); font-weight: 600; }
.k-lo { color: var(--text-burden-lo); font-weight: 600; }
/* both-sides-line (PI, 2026-10-29): Market 2 in the violet of its dots in the group figure (T.price[1]) */
.k-m2 { color: var(--text-price); font-weight: 600; }
/* scope-outcomes (PI, 2026-10-29): the two outcomes on the highlights of their figure labels */
.hl-zero, .hl-effect { padding: 0 .12em; margin: 0 -.04em; border-radius: 2px; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.hl-zero { background: var(--hl-zero); }
.hl-effect { background: var(--hl-effect); }
.beat:focus { outline: none; }
#text a, #text summary, #text .term { scroll-margin-top: calc(var(--bar-h) + 1rem); }   /* focus scrolling keeps links clear of the part bar */
/* skip link and back link: small, muted, inline links set off from the reader text; they are not buttons */
.beat-body p:has(> .skip-link) { margin: 0 0 1.4em; }
.beat-body p:has(> .skip-link.skip-back) { margin: 1.4em 0 0; }
.skip-link { font: 400 .875rem/1.5 var(--sans); color: var(--muted); text-decoration-line: underline; text-decoration-color: var(--rule); text-decoration-thickness: 1px; text-underline-offset: .25em; }
.skip-link:hover { color: var(--accent); text-decoration-color: currentColor; }
.skip-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* the button that opens a group of beats (main.js, RUNS): it reads like the summary of an expandable */
.beat-body p:has(> .run-btn) { margin: 1.25rem 0 0; padding-top: .7rem; border-top: 1px solid var(--rule); }
.run-btn { appearance: none; background: none; border: 0; padding: 0; cursor: pointer; display: flex; gap: .55rem; align-items: baseline; color: var(--accent); font: 500 .9375rem/1.5 var(--sans); text-align: left; }
.run-btn::before { content: ''; flex: none; width: .42rem; height: .42rem; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-.12em) rotate(-45deg); }
.run-btn[aria-expanded="true"]::before { transform: translateY(-.2em) rotate(45deg); }
.run-btn:hover { text-decoration: underline; text-underline-offset: .2em; text-decoration-thickness: 1px; }
.run-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

details { margin: 1.25rem 0 0; padding-top: .7rem; border-top: 1px solid var(--rule); font-size: 1rem; line-height: 1.6; }
summary { cursor: pointer; list-style: none; display: flex; gap: .55rem; align-items: baseline; color: var(--accent); font: 500 .9375rem/1.5 var(--sans); }
summary::-webkit-details-marker { display: none; }
summary::before { content: ''; flex: none; width: .42rem; height: .42rem; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-.12em) rotate(-45deg); }
details[open] > summary::before { transform: translateY(-.2em) rotate(45deg); }
summary:hover { text-decoration: underline; text-underline-offset: .2em; text-decoration-thickness: 1px; }
details p { margin: .6rem 0 0; }
details table { width: 100%; margin: .6rem 0 0; border-collapse: collapse; font: 400 .9375rem/1.4 var(--sans); font-variant-numeric: tabular-nums; }
details th, details td { padding: .3rem 0 .3rem .75rem; text-align: right; border-bottom: 1px solid var(--rule); }
details th:first-child, details td:first-child { padding-left: 0; text-align: left; }
details th { font-weight: 500; color: var(--muted); vertical-align: bottom; }

.term { border-bottom: 1px dotted var(--accent); cursor: help; position: relative; }
.term:focus-visible { outline-offset: 2px; background: var(--accent-soft); }
.tip { display: none; position: fixed; z-index: 70; width: 17rem; max-width: calc(100vw - 1rem); background: var(--ink); color: var(--bg); font: 400 .8125rem/1.5 var(--sans); padding: .6rem .75rem; border-radius: 2px; box-shadow: 0 6px 18px var(--tooltip-shadow); }
.term.show .tip { display: block; }

/* ---------- part bar ---------- */
/* Fixed at the top once the story starts. The pinned figure panel sits below it (#visual top / height use --bar-h). Desktop: one labelled segment
   per part, widths set in main.js (scroll length, with a floor for the label). Phone: a bare line plus one button that opens the list of parts. */
/* Part bar: connected line with stops, labels above (DESIGN.md) */
#parts { position: fixed; left: 0; right: 0; top: 0; height: var(--bar-h); z-index: 60; background: var(--bg); padding: 0 clamp(1.25rem, 4.5vw, 4rem); opacity: 0; visibility: hidden; transition: opacity .25s ease, visibility 0s linear .25s; }
#parts.on { opacity: 1; visibility: visible; transition-delay: 0s; }
#parts button { font: 500 13px/1 var(--sans); color: var(--muted); background: none; border: 0; padding: 0; margin: 0; cursor: pointer; -webkit-appearance: none; appearance: none; }
#parts button:focus-visible { outline-offset: -2px; }
.parts-track { list-style: none; margin: 0; padding: 0; height: 100%; display: flex; gap: 4px; align-items: stretch; }
.parts-track li { position: relative; flex: 1 1 0; min-width: 0; }
/* labels above the line, stops on it: all three layers (label, line, stop) absolutely positioned */
#parts .seg { position: relative; display: block; width: 100%; height: 100%; text-align: left; padding: 0; }
.seg .lab { position: absolute; top: 0; left: 0; right: 0; bottom: 20px; display: flex; align-items: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; transition: color .15s ease; }
/* the connecting line at the bottom: 5px up for the stop margin, +4px for half-stop = bottom 9px */
.seg::before, .seg .fill { content: ''; position: absolute; left: 0; right: 0; bottom: 9px; height: 2px; }
.seg::before { background: var(--rule); }
.seg .fill { background: var(--accent); transform-origin: 0 50%; transform: scaleX(0); will-change: transform; }
/* stop dots: absolutely positioned, centered on the line */
.seg::after { content: ''; position: absolute; z-index: 2; left: 0; bottom: 5px; width: 8px; height: 8px; border-radius: 50%; background: var(--rule); border: 2px solid var(--bg); }
.seg:hover .lab { color: var(--ink); }
.seg.cur .lab { color: var(--ink); }
.seg.done .lab { color: var(--muted); }
.seg.done::after { background: var(--accent); }
.seg.cur::after { background: var(--accent); width: 10px; height: 10px; bottom: 4px; left: -1px; box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--accent); }
#parts .parts-now, #parts-menu { display: none; }
@media (prefers-reduced-motion: reduce) { #parts, .seg .lab { transition: none; } }

/* ---------- figure panel ---------- */
.mod { position: absolute; inset: 0; visibility: hidden; pointer-events: none; }
.mod.live { visibility: visible; }
.mod.own { pointer-events: auto; }
#ph { position: absolute; inset: 0; display: none; align-items: center; justify-content: center; padding: 2rem; text-align: center; font: 400 .875rem/1.5 var(--sans); color: var(--muted); }
#ph.on { display: flex; }
#load-error { position: fixed; left: 1rem; right: 1rem; bottom: 1rem; z-index: 90; font: 400 .875rem/1.45 var(--sans); color: var(--bg); background: var(--ink); padding: .6rem .9rem; border-radius: 3px; }
#load-error[hidden] { display: none; }

/* ---------- scene (scene.js) ---------- */
.sc-layer { position: absolute; inset: 0; }
.sc-svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; font-family: var(--sans); font-variant-numeric: tabular-nums; }
.sc-svg text { font-family: var(--sans); }
.sc-map { position: absolute; display: block; pointer-events: none; }
.sc-cap { position: absolute; font: 400 .75rem/1.3 var(--sans); color: var(--muted); background: var(--bg); padding: 0 3px; margin-left: -3px; pointer-events: none; }

/* ---------- source line (window.sourceLine in main.js): one grey line at the foot of every chart ---------- */
.source-line { font-family: var(--sans); font-size: 12px; font-weight: 400; fill: var(--muted); color: var(--muted); pointer-events: none; }
div.source-line { position: absolute; left: 12px; bottom: 5px; line-height: 1.3; }

/* ---------- phone ---------- */
@media (max-width: 899px) and (orientation: portrait), (max-width: 899px) and (min-height: 501px) {
  body { font-size: 1rem; }
  :root { --tp-overlap: 28svh; }
  .tp-name { font-size: clamp(1.5rem, 6.4vw, 2rem); }
  #tp-map { z-index: 12; }
  #text { z-index: auto; }
  #layout { flex-direction: column; align-items: stretch; }
  #visual { order: -1; flex: none; width: 100%; height: calc(52vh - var(--bar-h)); height: calc(52svh - var(--bar-h)); z-index: 10; border-left: 0; border-bottom: 1px solid var(--rule); }
  /* the top padding puts the first block at the phone trigger line (GEOM.phone.trig = 1.15) as the 52svh panel pins */
  #text { flex: none; padding: 36vh 1.25rem 0; padding-top: calc(115vh - 52svh + var(--bar-h)); }
  /* the text is read in the band under the panel (52-100% of the screen): a build ends with the block's top near the panel's lower edge */
  .beat { max-width: none; margin-left: 0; min-height: 82vh; padding-bottom: 20vh; background: var(--bg); }
  .beat.long { min-height: 90vh; }
  #b-test { min-height: 130vh; }
  #b-past-estimates { min-height: 120vh; }
  #b-price-local, #b-simple { min-height: 115vh; }
  #b-ideal-shuffle, #b-nearby-intro, #b-both-sides-remove { min-height: 125vh; }
  #b-fluke-reshuffle { min-height: 280vh; }
  #b-fluke-reshuffle .beat-body { top: calc(52svh + .75rem); }
  .part-title { font-size: 1.5rem; }
  .beat-body > p { font-size: 1.125rem; }
}

/* compact part bar, including short landscape */
@media (max-width: 899px) {
  .parts-track li { min-width: 0 !important; }
}
@media (max-width: 899px), (orientation: landscape) and (max-height: 500px) {
  #parts { padding: 0 1.25rem; }
  .parts-track { position: absolute; left: 1.25rem; right: 1.25rem; bottom: 0; height: 2px; }
  #parts .seg { padding: 0; }
  .seg .lab { display: none; }
  /* Move text up: align to top of bar, leaving room for the ring centered on the track line at the bottom */
  #parts .parts-now { display: flex; align-items: flex-start; gap: .5rem; height: calc(100% - 2px); max-width: 100%; color: var(--ink); font-size: .8125rem; padding-top: 6px; }
  .parts-now-text { font-variant-numeric: tabular-nums; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  #parts .parts-now { position: relative; }
  #parts .parts-now::after { content: ''; position: absolute; inset: -7px -8px; }   /* a 44px-tall tap area on the 32px bar */
  .parts-chev { flex: none; width: .42rem; height: .42rem; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-.12em) rotate(45deg); color: var(--muted); transition: transform .15s ease; }
  #parts.open .parts-chev { transform: translateY(.1em) rotate(-135deg); }
  #parts-menu { display: block; position: absolute; left: 0; right: 0; top: 100%; list-style: none; margin: 0; padding: .25rem 0 .5rem; background: var(--bg); box-shadow: 0 1px 0 var(--rule), 0 10px 24px var(--menu-shadow); }
  #parts-menu[hidden] { display: none; }
  #parts .item { display: flex; align-items: center; width: 100%; min-height: 44px; text-align: left; padding: .6rem 1.25rem; font-size: .9375rem; color: var(--muted); }
  #parts .item.cur { color: var(--ink); font-weight: 600; }
}

/* ---------- short landscape ---------- */
@media (orientation: landscape) and (max-height: 500px) {
  :root { --tp-overlap: 0svh; }
  body { font-size: 1rem; }
  .tp { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-rows: auto auto auto; column-gap: 1rem; padding: 1rem; padding-left: calc(1rem + env(safe-area-inset-left, 0px)); padding-right: calc(1rem + env(safe-area-inset-right, 0px)); }
  .tp-name { font-size: clamp(1.625rem, 3.6vw, 2rem); padding-bottom: .5rem; margin-bottom: .9rem; }
  .tp-side { grid-row: 2; padding-top: 0; }
  .tp-hero { grid-row: 2 / 4; align-self: start; padding-bottom: 0; }
  .tp-figure { width: 100%; }
  .tp-lede { font-size: 1rem; line-height: 1.5; margin-bottom: .6rem; }
  .tp-author { font-size: .8125rem; line-height: 1.5; }
  .tp-begin { grid-row: 3; padding: .75rem 0 0; }
  #layout { padding-left: env(safe-area-inset-left, 0px); padding-right: env(safe-area-inset-right, 0px); }
  #text { flex: 1 1 0; min-width: 0; padding: 112vh 1rem 0; }
  #visual { flex: 0 0 54%; max-width: 515px; height: calc(100vh - var(--bar-h)); height: calc(100dvh - var(--bar-h)); }
  .beat-body > p { font-size: 1.0625rem; }
  .part-title { font-size: 1.5rem; }
  #parts { padding-left: calc(1.25rem + env(safe-area-inset-left, 0px)); padding-right: calc(1.25rem + env(safe-area-inset-right, 0px)); }
  .parts-track { left: calc(1.25rem + env(safe-area-inset-left, 0px)); right: calc(1.25rem + env(safe-area-inset-right, 0px)); }
  #parts-menu { max-height: calc(100vh - var(--bar-h)); max-height: calc(100dvh - var(--bar-h)); overflow-y: auto; }
  #parts .item { padding-left: calc(1.25rem + env(safe-area-inset-left, 0px)); padding-right: calc(1.25rem + env(safe-area-inset-right, 0px)); }
}

/* touch: controls shorter than 44px get an invisible tap area; nothing moves */
@media (pointer: coarse) {
  .run-btn, summary { position: relative; }
  .run-btn::after, summary::after { content: ''; position: absolute; inset: -.7rem 0; }
  .to-overview::after { content: ''; position: absolute; inset: -11px -8px; }
}

/* ---------- method overview (v6.3) ---------- */
/* Beat method-map. At 900px and wider the figure panel carries the overview (tiles drawn by js/dots_panels.js, panel "overview"), so the in-text list
   is hidden; below 900px the list is the interface and the panel only shows the six band labels. */
.mm { margin: 1.5em 0 0; font-family: var(--sans); }
/* Critique S7: at 900px and wider the list is out of sight but still reachable by Tab (display: none would remove it from the tab order). While focus is
   inside it, it opens as a compact list in the text column; the beat's minimum height absorbs the extra length, so the blocks below do not move. */
@media (min-width: 900px), (orientation: landscape) and (max-height: 500px) {
  .mm { position: absolute; width: 1px; height: 1px; margin: 0; overflow: hidden; clip-path: inset(50%); }
  .mm:focus-within { position: static; width: auto; height: auto; margin: 1.25em 0 0; padding: 0; overflow: visible; clip-path: none; }
  .mm:focus-within .mm-band { margin: 0 0 .45rem; }
  .mm:focus-within .mm-band-t { padding-bottom: .15rem; font-size: .75rem; }
  .mm:focus-within a.mm-tile { grid-template-columns: 1.5rem minmax(0, 1fr); min-height: 0; margin: 0; padding: .2rem .3rem; border-color: transparent; background: none; row-gap: 0; }
  .mm:focus-within .mm-n { width: 1.3rem; height: 1.3rem; font-size: .75rem; }
  .mm:focus-within .mm-t { font-size: .9375rem; }
  .mm:focus-within .mm-d, .mm:focus-within .mm-time, .mm:focus-within a.mm-tile.read::after { display: none; }
  .mm:focus-within a.mm-tile:hover { color: var(--accent); }
}
.mm-band { margin: 0 0 1.1rem; }
.mm-band-t { display: block; font: 500 .8125rem/1.3 var(--sans); color: var(--muted); padding: 0 .1rem .35rem; }
.mm a.mm-tile { position: relative; display: grid; grid-template-columns: 1.9rem minmax(0, 1fr) auto; column-gap: .55rem; row-gap: .1rem; align-items: baseline; min-height: 44px; margin: 0 0 .4rem; padding: .55rem 0 .6rem; border: 0; border-radius: 0; background: var(--bg); color: var(--ink); text-decoration: none; -webkit-tap-highlight-color: var(--overview-tap-highlight); }
.mm a.mm-tile::before { content: ''; position: absolute; left: .95rem; top: -.4rem; bottom: -.4rem; border-left: 1px solid var(--rule); }
.mm a.mm-tile:hover, .mm a.mm-tile:active { color: var(--accent); }
.mm-n { grid-row: 1; grid-column: 1; justify-self: center; align-self: center; position: relative; display: grid; place-items: center; width: 1.65rem; height: 1.65rem; background: var(--bg); color: var(--accent); font: 600 .8125rem/1 var(--sans); font-variant-numeric: tabular-nums; }
.mm-t { grid-row: 1; grid-column: 2; font: 600 1rem/1.3 var(--sans); }
.mm-time { grid-row: 1; grid-column: 3; font: 400 .8125rem/1.3 var(--sans); color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.mm-d { grid-row: 2; grid-column: 2 / 4; font: 400 .875rem/1.4 var(--sans); color: var(--muted); }
.mm a.mm-tile.read::after { content: ""; position: absolute; left: .8rem; bottom: .1rem; width: .3rem; height: .3rem; border-radius: 50%; background: var(--accent); }
.mm-tile:focus-visible { outline-offset: 2px; border-radius: 2px; }
/* the desktop tiles: svg links in the figure panel */
.mm-a { cursor: pointer; pointer-events: auto; text-decoration: none; transition: transform .18s ease, filter .18s ease; }
.mm-a .mm-box { transition: stroke .18s ease, fill .18s ease; }
.mm-a:hover, .mm-a:focus-visible { transform: translateY(-2px); filter: drop-shadow(0 5px 9px var(--overview-hover-shadow)); }
.mm-a:hover .mm-box, .mm-a:focus-visible .mm-box { stroke: var(--accent); stroke-width: 1.6; }
.mm-a:not(.mm-sum):hover .mm-box, .mm-a:not(.mm-sum):focus-visible .mm-box { fill: color-mix(in srgb, var(--accent-soft) 28%, var(--bg)); }
.mm-a { outline: none; }
.mm-ring { opacity: 0; stroke: var(--accent); stroke-width: 2; pointer-events: none; }
.mm-a:focus-visible .mm-ring { opacity: 1; }
.mm-glyph { transform-box: fill-box; transform-origin: center; }
.mm-a:hover .mm-glyph, .mm-a:focus-visible .mm-glyph { animation: mm-nudge .5s ease-out 1; }
@keyframes mm-nudge { 0% { transform: translate(var(--gx, 0), var(--gy, 0)) scale(1); } 40% { transform: scale(1.1) rotate(-3deg); } 100% { transform: scale(1) rotate(0); } }
.mm-tip { opacity: 0; pointer-events: none; transition: opacity .16s ease; filter: drop-shadow(0 4px 8px var(--ink-shadow-soft)); }
.panel-overview:has(.mm-a[data-k="1"]:is(:hover, :focus-visible)) .mm-tip[data-k="1"],
.panel-overview:has(.mm-a[data-k="2"]:is(:hover, :focus-visible)) .mm-tip[data-k="2"],
.panel-overview:has(.mm-a[data-k="3"]:is(:hover, :focus-visible)) .mm-tip[data-k="3"],
.panel-overview:has(.mm-a[data-k="4"]:is(:hover, :focus-visible)) .mm-tip[data-k="4"],
.panel-overview:has(.mm-a[data-k="5"]:is(:hover, :focus-visible)) .mm-tip[data-k="5"],
.panel-overview:has(.mm-a[data-k="6"]:is(:hover, :focus-visible)) .mm-tip[data-k="6"],
.panel-overview:has(.mm-a[data-k="7"]:is(:hover, :focus-visible)) .mm-tip[data-k="7"],
.panel-overview:has(.mm-a[data-k="8"]:is(:hover, :focus-visible)) .mm-tip[data-k="8"],
.panel-overview:has(.mm-a[data-k="9"]:is(:hover, :focus-visible)) .mm-tip[data-k="9"],
.panel-overview:has(.mm-a[data-k="10"]:is(:hover, :focus-visible)) .mm-tip[data-k="10"],
.panel-overview:has(.mm-a[data-k="11"]:is(:hover, :focus-visible)) .mm-tip[data-k="11"],
.panel-overview:has(.mm-a[data-k="12"]:is(:hover, :focus-visible)) .mm-tip[data-k="12"],
.panel-overview:has(.mm-a[data-k="13"]:is(:hover, :focus-visible)) .mm-tip[data-k="13"] { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  .mm-a, .mm-a .mm-box, .mm-tip { transition: none; }
  .mm-a:hover, .mm-a:focus-visible { transform: none; }
  .mm-a:hover .mm-glyph, .mm-a:focus-visible .mm-glyph { animation: none; }
}

/* v8: band headings */
.band-title {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.15rem 0;
  padding: 0;
  line-height: 1.25;
}

/* v8: slice bar overlay */
.slice-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  pointer-events: none;
  z-index: 5;
}

/* v9.4: "Back to the overview" button in the figure aside (main.js placeOverview positions it by a transform) */
.to-overview { position: absolute; left: 0; top: 0; z-index: 20; display: inline-flex; align-items: center; gap: 5px; font: 500 13px/1.4 var(--sans); color: var(--accent); background: none; border: none; border-radius: 2px; padding: 2px 4px; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em; text-decoration-color: var(--link-underline); white-space: nowrap; visibility: hidden; pointer-events: none; transition: transform .18s ease-out; }
.to-overview.on { visibility: visible; pointer-events: auto; }
.to-overview:hover, .to-overview:focus-visible { text-decoration-color: currentColor; }
.to-overview:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.to-overview .short { display: none; }
@media (max-width: 599px) { .to-overview .long { display: none; } .to-overview .short { display: inline; } }
@media (prefers-reduced-motion: reduce) { .to-overview { transition: none; } }