@charset "UTF-8";

/* ─────────────────────────────────────────────────────────────────────────
   Shared Tufte core — canonical foundations for explore.exidia.app.
   ET Book @font-face + upstream Tufte CSS, the white-paper/system-serif
   override, design tokens, masthead (crumbs/series/kicker), citations, the
   mobile-robustness block, and the shared a11y base (skip-link, focus ring,
   reduced-motion). Loaded FIRST; each exploration's component sheet loads
   after and wins on source order.
   See todo.org "Unify the duplicated Tufte foundations" and
   docs/superpowers/specs/2026-06-08-tufte-css-unification-design.md.
   ───────────────────────────────────────────────────────────────────────── */

/* Import ET Book styles
   adapted from https://github.com/edwardtufte/et-book/blob/gh-pages/et-book.css */

@font-face {
    font-family: "et-book";
    src: url("et-book/et-book-roman-line-figures/et-book-roman-line-figures.eot");
    src: url("et-book/et-book-roman-line-figures/et-book-roman-line-figures.eot?#iefix") format("embedded-opentype"), url("et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff") format("woff"), url("et-book/et-book-roman-line-figures/et-book-roman-line-figures.ttf") format("truetype"), url("et-book/et-book-roman-line-figures/et-book-roman-line-figures.svg#etbookromanosf") format("svg");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "et-book";
    src: url("et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.eot");
    src: url("et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.eot?#iefix") format("embedded-opentype"), url("et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.woff") format("woff"), url("et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.ttf") format("truetype"), url("et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.svg#etbookromanosf") format("svg");
    font-weight: normal;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: "et-book";
    src: url("et-book/et-book-bold-line-figures/et-book-bold-line-figures.eot");
    src: url("et-book/et-book-bold-line-figures/et-book-bold-line-figures.eot?#iefix") format("embedded-opentype"), url("et-book/et-book-bold-line-figures/et-book-bold-line-figures.woff") format("woff"), url("et-book/et-book-bold-line-figures/et-book-bold-line-figures.ttf") format("truetype"), url("et-book/et-book-bold-line-figures/et-book-bold-line-figures.svg#etbookromanosf") format("svg");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "et-book-roman-old-style";
    src: url("et-book/et-book-roman-old-style-figures/et-book-roman-old-style-figures.eot");
    src: url("et-book/et-book-roman-old-style-figures/et-book-roman-old-style-figures.eot?#iefix") format("embedded-opentype"), url("et-book/et-book-roman-old-style-figures/et-book-roman-old-style-figures.woff") format("woff"), url("et-book/et-book-roman-old-style-figures/et-book-roman-old-style-figures.ttf") format("truetype"), url("et-book/et-book-roman-old-style-figures/et-book-roman-old-style-figures.svg#etbookromanosf") format("svg");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* Tufte CSS styles */
html {
    font-size: 15px;
}

body {
    width: 87.5%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 12.5%;
    font-family: et-book, Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Georgia, serif;
    background-color: #fffff8;
    color: #111;
    max-width: 1400px;
    counter-reset: sidenote-counter;
}

/* Adds dark mode */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #151515;
        color: #ddd;
    }
}

h1 {
    font-weight: 400;
    margin-top: 4rem;
    margin-bottom: 1.5rem;
    font-size: 3.2rem;
    line-height: 1;
}

h2 {
    font-style: italic;
    font-weight: 400;
    margin-top: 2.1rem;
    margin-bottom: 1.4rem;
    font-size: 2.2rem;
    line-height: 1;
}

h3 {
    font-style: italic;
    font-weight: 400;
    font-size: 1.7rem;
    margin-top: 2rem;
    margin-bottom: 1.4rem;
    line-height: 1;
}

hr {
    display: block;
    height: 1px;
    width: 55%;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

p.subtitle {
    font-style: italic;
    margin-top: 1rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    display: block;
    line-height: 1;
}

.numeral {
    font-family: et-book-roman-old-style;
}

.danger {
    color: red;
}

article {
    padding: 5rem 0rem;
}

section {
    padding-top: 1rem;
    padding-bottom: 1rem;
}

p,
dl,
ol,
ul {
    font-size: 1.4rem;
    line-height: 2rem;
}

p {
    margin-top: 1.4rem;
    margin-bottom: 1.4rem;
    padding-right: 0;
    vertical-align: baseline;
}

/* Chapter Epigraphs */
div.epigraph {
    margin: 5em 0;
}

div.epigraph > blockquote {
    margin-top: 3em;
    margin-bottom: 3em;
}

div.epigraph > blockquote,
div.epigraph > blockquote > p {
    font-style: italic;
}

div.epigraph > blockquote > footer {
    font-style: normal;
}

div.epigraph > blockquote > footer > cite {
    font-style: italic;
}
/* end chapter epigraphs styles */

blockquote {
    font-size: 1.4rem;
}

blockquote p {
    width: 55%;
    margin-right: 40px;
}

blockquote footer {
    width: 55%;
    font-size: 1.1rem;
    text-align: right;
}

section > p,
section > footer,
section > table {
    width: 55%;
}

/* 50 + 5 == 55, to be the same width as paragraph */
section > dl,
section > ol,
section > ul {
    width: 50%;
    -webkit-padding-start: 5%;
}

dt:not(:first-child),
li:not(:first-child) {
    margin-top: 0.25rem;
}

figure {
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
    max-width: 55%;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    margin: 0 0 3em 0;
}

figcaption {
    float: right;
    clear: right;
    margin-top: 0;
    margin-bottom: 0;
    font-size: 1.1rem;
    line-height: 1.6;
    vertical-align: baseline;
    position: relative;
    max-width: 40%;
}

figure.fullwidth figcaption {
    margin-right: 24%;
}

a:link,
a:visited {
    color: inherit;
    text-underline-offset: 0.1em;
    text-decoration-thickness: 0.05em;
}

/* Sidenotes, margin notes, figures, captions */
img {
    max-width: 100%;
}

.sidenote,
.marginnote {
    float: right;
    clear: right;
    margin-right: -60%;
    width: 50%;
    margin-top: 0.3rem;
    margin-bottom: 0;
    font-size: 1.1rem;
    line-height: 1.3;
    vertical-align: baseline;
    position: relative;
}

.sidenote-number {
    counter-increment: sidenote-counter;
}

.sidenote-number:after,
.sidenote:before {
    font-family: et-book-roman-old-style;
    position: relative;
    vertical-align: baseline;
}

.sidenote-number:after {
    content: counter(sidenote-counter);
    font-size: 1rem;
    top: -0.5rem;
    left: 0.1rem;
}

.sidenote:before {
    content: counter(sidenote-counter) " ";
    font-size: 1rem;
    top: -0.5rem;
}

blockquote .sidenote,
blockquote .marginnote {
    margin-right: -82%;
    min-width: 59%;
    text-align: left;
}

div.fullwidth,
table.fullwidth {
    width: 100%;
}

div.table-wrapper {
    overflow-x: auto;
    font-family: "Trebuchet MS", "Gill Sans", "Gill Sans MT", sans-serif;
}

.sans {
    font-family: "Gill Sans", "Gill Sans MT", Calibri, sans-serif;
    letter-spacing: .03em;
}

code, pre > code {
    font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
    font-size: 1.0rem;
    line-height: 1.42;
    -webkit-text-size-adjust: 100%; /* Prevent adjustments of font size after orientation changes in iOS. See https://github.com/edwardtufte/tufte-css/issues/81#issuecomment-261953409 */
}

.sans > code {
    font-size: 1.2rem;
}

h1 > code,
h2 > code,
h3 > code {
    font-size: 0.80em;
}

.marginnote > code,
.sidenote > code {
    font-size: 1rem;
}

pre > code {
    font-size: 0.9rem;
    width: 52.5%;
    margin-left: 2.5%;
    overflow-x: auto;
    display: block;
}

pre.fullwidth > code {
    width: 90%;
}

.fullwidth {
    max-width: 90%;
    clear:both;
}

span.newthought {
    font-variant: small-caps;
    font-size: 1.2em;
}

input.margin-toggle {
    display: none;
}

label.sidenote-number {
    display: inline-block;
    max-height: 2rem; /* should be less than or equal to paragraph line-height */
}

label.margin-toggle:not(.sidenote-number) {
    display: none;
}

.iframe-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    padding-top: 25px;
    height: 0;
}

.iframe-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

@media (max-width: 760px) {
    body {
        width: 84%;
        padding-left: 8%;
        padding-right: 8%;
    }

    hr,
    section > p,
    section > footer,
    section > table {
        width: 100%;
    }

    pre > code {
        width: 97%;
    }

    section > dl,
    section > ol,
    section > ul {
        width: 90%;
    }

    figure {
        max-width: 90%;
    }

    figcaption,
    figure.fullwidth figcaption {
        margin-right: 0%;
        max-width: none;
    }

    blockquote {
        margin-left: 1.5em;
        margin-right: 0em;
    }

    blockquote p,
    blockquote footer {
        width: 100%;
    }

    label.margin-toggle:not(.sidenote-number) {
        display: inline;
    }

    .sidenote,
    .marginnote {
        display: none;
    }

    .margin-toggle:checked + .sidenote,
    .margin-toggle:checked + .marginnote {
        display: block;
        /* float:none overrides the base .marginnote float:right — a floated
           note (95% wide) squeezes a following flex/BFC container (the hero
           .pills, a .panel) into the sliver beside it, collapsing it to ~0. */
        float: none;
        clear: both;
        width: 95%;
        margin: 1rem 2.5%;
        vertical-align: baseline;
        position: relative;
    }

    label {
        cursor: pointer;
    }

    div.table-wrapper,
    table {
        width: 85%;
    }

    img {
        width: 100%;
    }
}

/* === project foundation layer: tokens · white paper · masthead · citations === */
:root{
  --paper:#fff; --ink:#111111; --muted:#333333; --faint:#565656;
  --rule:#e3e3e3; --rule-strong:#cfcfcf; --chip:#f4f4f2;
  --accent:#3a5e8c;
  --wax:#b45309; --qmd:#1d4ed8; --green:#15803d; --red:#b91c1c; --amber:#c2410c; --violet:#6d28d9;
  --serif:Charter,"Bitstream Charter","Sitka Text",Cambria,Georgia,serif;
  --mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
}
/* white paper, near-black ink, system serif (overrides et-book so no font files load) */
html{ background:var(--paper); font-size:15px; }
body{ background:var(--paper); color:var(--ink); font-family:var(--serif); }
/* a right gutter so full-width tables (and margin notes) never hug the window
   edge — Tufte's body has a 12.5% LEFT indent but no right gutter */
article{ box-sizing:border-box; padding-right:10%; }
@media(max-width:760px){ article{ padding-right:0; } }
h1,h2,h3,h4{ font-family:var(--serif); color:var(--ink); }
p,li,table,figcaption{ color:var(--ink); }
.numeral{ font-family:var(--serif); }
.sidenote-number:after,.sidenote:before{ font-family:var(--serif); }
a:link,a:visited{ color:var(--accent); }
hr{ border-color:var(--rule); }
code{ font-family:var(--mono); font-size:max(13px,.88em); }   /* hard 13px floor in any context */
:not(pre)>code{ background:var(--chip); border-radius:3px; padding:.05rem .3rem; }   /* bg only, no border — matches closure */

/* masthead */
.crumbs{ font-size:13px; color:var(--faint); margin:0 0 .5rem; }   /* home breadcrumb, atop every page */
.crumbs a{ color:var(--accent); } .crumbs .sep{ color:var(--rule-strong); margin:0 .45em; }
/* series nav — jump straight to any page in this exploration; current is marked */
.series{ font-size:13px; margin:0 0 1.6rem; line-height:1.7; }
.series a{ color:var(--accent); } .series .here{ color:var(--ink); font-weight:700; }
/* The dot separator is a ::before on each series link (the children are anchors),
   so the anchor's underline is painted across it. A descendant cannot cancel an
   ancestor's text-decoration; making the dot an atomic inline (inline-block) takes
   it out of the underline's path, leaving only the link text underlined. */
.series>*+*::before{ content:"·"; display:inline-block; color:var(--rule-strong); margin:0 .55em; }
.kicker{ font-variant:small-caps; letter-spacing:.08em; color:var(--faint); font-style:normal; }
p.subtitle{ color:var(--muted); }

/* citations: inline cites are small monospace refs; Wax amber, qmd blue. In the
   prose they're promoted to real Tufte margin notes (see the .marginnote spans). */
.cite{ font-family:var(--mono); font-size:13px; color:var(--faint);
       background:var(--chip); border:1px solid var(--rule); border-radius:5px; padding:0 .35em; white-space:nowrap; }
.cite b{ color:var(--wax); } .cite.q b{ color:var(--qmd); }
.marginnote .cite{ white-space:normal; }

/* === mobile robustness + shared a11y base === */
/* ─────────────────────────────────────────────────────────────────────────
   Mobile (≤760px) robustness — added after a full small-screen audit.
   The Tufte measure collapses to the full width here, so anything with an
   intrinsic width wider than the screen (data tables, key/value code panes,
   long inline code) must scroll or break *inside* its own box rather than
   pushing the whole page sideways. The ⊕ margin-note toggle also gains its
   open-state ⊖ glyph (the toggle is mobile-only; on desktop the note shows
   in the gutter and the label is display:none).
   ───────────────────────────────────────────────────────────────────────── */
@media(max-width:760px){
  /* margin-note toggle glyph: ⊕ when closed, ⊖ when the note is open. The
     glyph is CSS-generated (the label markup carries no literal character) so
     the :checked state of the adjacent checkbox can swap it via :has(). */
  label.margin-toggle:not(.sidenote-number)::after{ content:"\2295"; }
  label.margin-toggle:not(.sidenote-number):has(+ .margin-toggle:checked)::after{ content:"\2296"; }

  /* focusable sr-only clip — display:block beats the base display:none so the
     checkbox enters the tab order on mobile; the 1px clip keeps it invisible.
     Focus ring is shown on the visible glyph (the ::after pseudo-element of
     the adjacent label) via :has(), not on the invisible 1px input. */
  input.margin-toggle{
    display:block; position:absolute; width:1px; height:1px;
    padding:0; margin:-1px; overflow:hidden; clip:rect(0 0 0 0);
    white-space:nowrap; border:0;
  }
  label.margin-toggle:not(.sidenote-number):has(+ input.margin-toggle:focus-visible)::after{
    outline:2px solid var(--accent); outline-offset:2px; border-radius:3px;
  }

  /* wide tables scroll inside their own box, never the viewport. .fw and
     .tablescroll are the designated scroll boxes; tables inside them never
     own overflow so their implicit table role is preserved for AT. */
  .fw{ overflow-x:auto; }
  .tablescroll{ overflow-x:auto; max-width:100%; }

  /* key/value code panes (.kvs): let the value cell shrink to 0 min so its
     <pre> scrolls instead of forcing the grid wider than the screen. */
  .kvs>*{ min-width:0; }
  .kvs pre{ overflow-x:auto; }

  /* long inline code in prose breaks rather than overflowing — but NOT table
     cells, which stay wide so the table scrolls with readable columns. */
  p code, li code{ overflow-wrap:anywhere; }

  /* a file cite is white-space:nowrap by default (keep file:line together); a
     long one has nowhere to break on a narrow screen, so allow it here. Table
     cells keep their own nowrap (set below) so tables still scroll. */
  .cite{ white-space:normal; overflow-wrap:anywhere; }
  td .cite, th .cite{ white-space:nowrap; }
}

/* shared a11y base — keep in sync across stylesheets (see a11y plan, Convention A) */
.skip-link{
  position:absolute; left:8px; top:-48px; z-index:1000;
  background:var(--paper,#fff); color:var(--accent);
  padding:8px 14px; border:1px solid var(--accent); border-radius:6px;
  text-decoration:none; transition:top .15s ease;
}
.skip-link:focus{ top:8px; }

:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}