@layer base, layout, specimens, responsive;
@layer base {
  :root {
    color-scheme: dark;
    /* The institute's black and lime, as on piatra.institute and polylogue. */
    --ground: #000000; --panel: #0a0a0a; --raised: #141414;
    --ink: #ffffff; --muted: rgba(255, 255, 255, 0.62); --faint: rgba(255, 255, 255, 0.45);
    --line: rgba(255, 255, 255, 0.12);
    --accent: #a3e635; --brand: #84cc16; --accent-ink: #0a0a0a;
    --plate: #f7fee7; --plate-ink: #000000; --error: #ffac94;
    --code-keyword: var(--accent); --code-string: #d8c48a; --code-number: #f0a875;
    --code-comment: var(--faint); --code-type: #8cc8bf; --code-function: var(--ink);
    --serif-font: "Piatra Serif"; --sans-font: "Piatra Sans"; --mono-font: "Piatra Mono"; --math-font: "Piatra Math";
    --serif: var(--serif-font), Georgia, serif;
    --sans: var(--sans-font), Inter, sans-serif;
  }
  :root[data-theme="light"] {
    color-scheme: light;
    --ground: #fafaf9; --panel: #ffffff; --raised: #f5f5f4;
    --ink: #0a0a0a; --muted: rgba(10, 10, 10, 0.62); --faint: rgba(10, 10, 10, 0.45);
    --line: rgba(10, 10, 10, 0.14);
    --accent: #3f6212; --brand: #4d7c0f; --accent-ink: #ffffff; --error: #9e3017;
    --code-string: #6b5512; --code-number: #9a4a14; --code-type: #2b6260;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 24px; scrollbar-gutter: stable; scrollbar-color: var(--line) var(--ground); }
  body { margin: 0; background: var(--ground); color: var(--ink); font: 400 15px/1.7 var(--sans); font-synthesis: none; -webkit-font-smoothing: antialiased; }
  body, textarea, input { caret-color: var(--accent); }
  ::selection { color: var(--accent-ink); background: var(--accent); }
  a { color: inherit; text-decoration: none; text-underline-offset: 5px; text-decoration-thickness: 1px; }
  a:hover { color: var(--accent); }
  button, input, select, textarea { font: inherit; color: inherit; }
  button, select, input[type="range"], input[type="checkbox"] { cursor: pointer; }
  button { background: transparent; border: 0; border-radius: 0; padding: 8px 0; }
  button:disabled, input:disabled, select:disabled, textarea:disabled { opacity: .5; cursor: wait; }
  a[aria-disabled="true"] { opacity: .5; pointer-events: none; }
  /* The institute's focus: a one-pixel warm-white ring; fields light their own border. */
  :focus-visible { outline: 1px solid var(--ink); outline-offset: 2px; }
  select:focus-visible, input:not([type="range"], [type="checkbox"]):focus-visible, textarea:focus-visible { outline: none; }
  [hidden] { display: none !important; }
  p, h1, h2, h3, h4, dl { margin: 0; }
  h1, h2, h3, h4 { font-weight: 400; }
  .visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .skip-link { position: fixed; top: -100px; left: 12px; background: var(--plate); color: var(--plate-ink); padding: 10px 15px; z-index: 5; }
  .skip-link:focus { top: 12px; }
  input[type="range"], input[type="checkbox"] { accent-color: var(--brand); }
  select { min-height: 38px; background: var(--ground); border: 1px solid var(--line); border-radius: 0; padding: 8px 10px; width: 100%; font: 500 14px/1.5 var(--sans); }
  select:focus { border-color: var(--ink); }
  input[type="range"] { width: 100%; min-height: 30px; margin: 6px 0 0; }
  .text-action { color: var(--accent); font: 500 14px/1.5 var(--sans); }
  .text-action:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
  .subhead { font: 600 13px/1.5 var(--sans); color: var(--accent); }
}
@layer layout {
  main, .site-header, .site-footer { width: min(1280px, calc(100% - 96px)); margin-inline: auto; }
  .site-header { display: flex; align-items: center; gap: 32px; min-height: 84px; border-bottom: 1px solid var(--line); }
  .brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; color: var(--ink); }
  .brand:hover { color: var(--ink); }
  .brand img { width: 48px; height: 48px; }
  .brand-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
  .brand-wordmark { background: var(--plate); color: var(--plate-ink); padding: 3px 7px; font: 700 12px/1.4 var(--serif); letter-spacing: .02em; text-transform: uppercase; white-space: nowrap; }
  .brand-product { font: 400 20px/1.15 var(--serif); }
  .site-header nav { display: flex; gap: 30px; margin-left: auto; font-size: 13px; }
  .site-header nav a { color: var(--muted); padding: 8px 0; }
  .site-header nav a:hover { color: var(--ink); box-shadow: 0 1px var(--accent); }
  .theme-toggle { display: flex; align-items: center; justify-content: center; padding: 10px; border: 1px solid var(--line); color: var(--ink); }
  .theme-toggle:hover { color: var(--accent); }
  .theme-toggle:focus-visible { outline: none; border-color: var(--ink); }
  .theme-toggle[aria-pressed="true"] { background: var(--raised); }
  .intro { display: grid; grid-template-columns: 1.4fr 1fr; align-items: center; min-height: 440px; padding-block: 64px; gap: 40px; }
  h1 { font: 400 clamp(2.75rem, 5.2vw, 4.75rem)/1.12 var(--serif); letter-spacing: -.035em; }
  .intro-lines { margin-top: 28px; font: 400 clamp(1.25rem, 2vw, 1.6rem)/1.5 var(--serif); color: var(--muted); }
  .intro-lines span { display: block; }
  .letter-study { display: flex; flex-direction: column; align-items: center; justify-content: center; }
  .letter-study > span { font-family: var(--serif); font-size: clamp(100px, 16vw, 220px); line-height: 1.15; color: var(--accent); letter-spacing: -.035em; }
  .letter-study > p { margin-top: 12px; font-size: 12px; color: var(--muted); }
  section { scroll-margin-top: 30px; }
  .section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
  .section-heading h2 { font: 400 clamp(1.5rem, 2.2vw, 2rem)/1.3 var(--serif); letter-spacing: -.025em; }
  .section-heading > span { font-size: 13px; color: var(--muted); }
  .playground, .specimens, .downloads { border-top: 1px solid var(--line); padding-top: 40px; }
  .load-status { margin-top: 14px; font-size: 13px; color: var(--muted); }
  .fatal-error { padding-block: 20px; color: var(--error); }
  .controls { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 20px; padding-block: 28px 24px; border-bottom: 1px solid var(--line); }
  .controls label { display: block; min-width: 0; color: var(--muted); font-size: 12px; }
  .controls select { margin-top: 6px; color: var(--ink); }
  /* Ranges take the selects' height, so every track sits on the selects' middle line. */
  .controls input[type="range"] { display: block; height: 38px; min-height: 38px; margin: 6px 0 0; }
  .controls output { float: right; font-variant-numeric: tabular-nums; color: var(--ink); }
  #specimen-text { display: block; width: 100%; min-height: 180px; max-height: 520px; padding: 32px 0 12px; border: 0; border-radius: 0; background: transparent; resize: vertical; font-family: var(--serif); font-size: 72px; line-height: 1.2; letter-spacing: 0; }
  #specimen-text:focus { box-shadow: 0 1px var(--muted); }
  .specimen-footer { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; padding-block: 14px 20px; }
  #coverage-status { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
  #coverage-status[data-warning="true"] { color: var(--error); }
  .font-details { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding-block: 14px; color: var(--muted); font-size: 12px; }
  .font-details > div { display: flex; gap: 24px; }
  .font-details a { color: var(--accent); text-transform: uppercase; letter-spacing: .06em; text-decoration: underline; text-underline-offset: 4px; }
  .comparison { padding-block: 64px; border-top: 1px solid var(--line); }
  .check-label { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; cursor: pointer; }
  .check-label input { width: 15px; height: 15px; }
  .section-copy { margin-top: 14px; color: var(--muted); max-width: 72ch; }
  .comparison-grid { --comparison-gutter: 28px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: calc(2 * var(--comparison-gutter)); margin-top: 40px; }
  .comparison-grid article { position: relative; min-width: 0; }
  .comparison-grid article:not(:last-child)::after { content: ""; position: absolute; top: 0; bottom: 0; right: calc(-1 * var(--comparison-gutter)); width: 1px; background: var(--line); }
  .comparison-grid h3 { margin-bottom: 20px; }
  .comparison-text { min-height: 100px; overflow-wrap: anywhere; line-height: 1.35; white-space: pre-wrap; }
  .comparison-body { margin-top: 24px; font: 400 16px/1.7 var(--serif); color: var(--muted); }
  .specimen-tabs { display: flex; gap: 28px; overflow-x: auto; margin-top: 24px; border-bottom: 1px solid var(--line); }
  .specimen-tabs button { flex-shrink: 0; padding-block: 12px 14px; color: var(--muted); font-size: 13px; }
  .specimen-tabs button:hover { color: var(--ink); }
  .specimen-tabs button[aria-selected="true"] { color: var(--ink); box-shadow: inset 0 -2px var(--accent); }
  .specimen-panel { padding-block: 44px 56px; min-height: 540px; }
  .panel-caption { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; margin-bottom: 32px; }
  .panel-caption h3 { font: 400 27px/1.3 var(--serif); }
  .panel-caption p, .panel-caption label, .panel-note { font-size: 13px; color: var(--muted); }
  .panel-caption p { max-width: 52ch; }
  .panel-note { margin-top: 32px; max-width: 78ch; }
  .downloads { display: grid; grid-template-columns: 1.2fr 1fr; align-items: start; gap: 64px; padding-block: 64px; }
  .downloads h2 { font: 400 clamp(1.5rem, 2.2vw, 2rem)/1.3 var(--serif); letter-spacing: -.025em; }
  .downloads p { margin-top: 16px; font-size: 13px; color: var(--muted); }
  .download-actions { display: grid; gap: 0; }
  .download-actions a { display: flex; justify-content: space-between; gap: 18px; padding-block: 15px; border-bottom: 1px solid var(--line); font-size: 13px; }
  .download-actions a > span { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
  .download-actions .primary-link { margin-bottom: 8px; padding: 13px 20px; border: 0; background: var(--brand); color: var(--accent-ink); font: 500 14px/1.5 var(--sans); }
  .download-actions .primary-link:hover { background: var(--accent); color: var(--accent-ink); }
  .download-actions .primary-link > span { color: var(--accent-ink); }
  .site-footer { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-block: 24px 40px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
  .footer-links { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
  .caps-link { padding: 8px; color: var(--ink); font: 500 12px/1.5 var(--sans); letter-spacing: .06em; text-transform: uppercase; text-decoration: underline; text-underline-offset: 4px; }
}
@layer specimens {
  .reading-panel { display: grid; grid-template-columns: minmax(0, 720px) 1fr; gap: 90px; }
  .reading-article { font: 19px/1.75 var(--serif); }
  .reading-article h3 { font-size: 43px; line-height: 1.25; letter-spacing: -.02em; margin-bottom: 28px; }
  .reading-article p + p { margin-top: 21px; }
  .reading-article em { font-style: italic; }
  .reading-article footer { font: 12px/1.5 var(--sans); color: var(--muted); margin-top: 14px; }
  .reading-verse { margin: 44px 0 0; padding-left: 20px; border-left: 2px solid var(--brand); font-style: italic; font-size: 22px; line-height: 1.6; }
  .reading-notes { color: var(--muted); font-size: 13px; padding-top: 9px; }
  .reading-notes dt { margin-top: 22px; color: var(--ink); }
  .reading-notes dt:first-child { margin-top: 0; }
  .reading-notes dd { margin: 4px 0 0; max-width: 25ch; }
  .interface-demo { max-width: 850px; font-family: var(--sans); padding: 32px; background: var(--panel); border: 1px solid var(--line); }
  .interface-top { display: flex; align-items: end; justify-content: space-between; gap: 30px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
  .interface-top h4 { font-size: 26px; }
  .interface-top label { font-size: 13px; color: var(--muted); }
  .interface-top input { display: block; margin-top: 8px; padding: 10px 12px; background: var(--ground); color: var(--ink); border: 1px solid var(--line); min-width: 250px; width: 100%; border-radius: 0; }
  .interface-top input:focus { border-color: var(--ink); }
  .interface-top input::placeholder { color: var(--faint); }
  .publication { display: grid; grid-template-columns: 1fr 130px; gap: 20px; padding-block: 20px; border-bottom: 1px solid var(--line); }
  .publication h5 { margin: 0 0 6px; font-size: 19px; font-weight: 400; }
  .publication p { color: var(--muted); font-size: 14px; }
  .publication .publication-subject { align-self: center; text-align: right; font-size: 12px; color: var(--accent); }
  #publication-status { margin-top: 20px; font-size: 13px; color: var(--muted); }
  .code-study { background: var(--panel); border: 1px solid var(--line); padding: 32px; }
  .code-study pre { margin: 0; overflow-x: auto; font: 16px/1.8 var(--mono-font), monospace; tab-size: 4; }
  .code-study code { font-family: var(--mono-font), monospace; }
  .code-controls { display: flex; align-items: center; gap: 28px; font-size: 13px; color: var(--muted); }
  .code-controls select { width: auto; margin-left: 8px; }
  .tok-keyword { color: var(--code-keyword); }
  .tok-string { color: var(--code-string); }
  .tok-number { color: var(--code-number); }
  .tok-comment { color: var(--code-comment); font-style: italic; }
  .tok-type, .tok-attribute { color: var(--code-type); }
  .tok-function { color: var(--code-function); font-weight: 600; }
  .confusables { font: 15px/1.8 var(--mono-font), monospace; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); overflow-x: auto; white-space: nowrap; }
  .equation-list { display: grid; gap: 0; }
  .equation { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 30px; align-items: center; border-bottom: 1px solid var(--line); padding-block: 28px; }
  .equation h4 { font: 600 13px/1.5 var(--sans); color: var(--accent); }
  .equation > div { overflow-x: auto; padding: 12px 0; }
  .equation math { font-family: var(--math-font), math; font-size: 27px; }
  .language-row { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 30px; padding-block: 20px; border-bottom: 1px solid var(--line); }
  .language-row h4 { font: 600 13px/1.5 var(--sans); color: var(--accent); padding-top: 6px; }
  .language-row p { font: 23px/1.65 var(--serif); }
  .script-probes { padding-top: 32px; }
  .script-probes h4 { font: 600 13px/1.5 var(--sans); color: var(--accent); margin-bottom: 16px; }
  .script-probes p[lang] { font: 28px/1.7 var(--sans); }
  .figure-study { font: 44px/1.8 var(--serif); overflow-wrap: anywhere; }
  .figures-lining { font-feature-settings: "lnum" 1; }
  .figures-tabular { font-feature-settings: "tnum" 1; }
  .wall-study { text-align: center; padding: 64px 0 48px; font-family: var(--serif); font-optical-sizing: none; font-variation-settings: "opsz" 144; }
  .wall-name { font-size: clamp(64px, 15vw, 220px); line-height: 1; letter-spacing: .06em; }
  .wall-line { margin-top: 32px; font-size: clamp(14px, 1.9vw, 26px); letter-spacing: .22em; }
  .wall-small { margin-top: 20px; font-size: clamp(14px, 1.5vw, 20px); letter-spacing: .08em; font-feature-settings: "smcp" 1, "c2sc" 1; color: var(--accent); }
  .display-study { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 40px; }
  .display-serif { font: 76px/1.15 var(--serif); letter-spacing: -.025em; }
  .display-italic { font: italic 56px/1.4 var(--serif); color: var(--accent); }
  .display-sans { font: 64px/1.15 var(--sans); letter-spacing: -.03em; grid-column: 1 / -1; margin-top: 24px; }
}
@layer responsive {
  @media (max-width: 950px) {
    main, .site-header, .site-footer { width: calc(100% - 56px); }
    .intro { min-height: 360px; gap: 16px; }
    .controls { grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px 24px; }
    .reading-panel { gap: 44px; grid-template-columns: minmax(0, 1fr) 160px; }
    .downloads { gap: 32px; }
    .comparison-grid { --comparison-gutter: 18px; }
    .display-italic { font-size: 42px; }
  }
  @media (max-width: 640px) {
    main, .site-header, .site-footer { width: calc(100% - 40px); }
    .site-header { gap: 16px; min-height: 72px; }
    .brand img { width: 40px; height: 40px; }
    .brand-product { font-size: 18px; }
    .site-header nav { display: none; }
    .theme-toggle { margin-left: auto; }
    .intro { grid-template-columns: 1fr; padding-block: 40px 32px; min-height: 0; }
    h1 { font-size: clamp(2.5rem, 11vw, 4rem); }
    .intro-lines { font-size: 19px; margin-top: 20px; }
    .letter-study { flex-direction: row; align-items: center; justify-content: space-between; margin-top: 16px; }
    .letter-study > span { font-size: 105px; }
    .letter-study > p { max-width: 18ch; text-align: right; font-size: 11px; }
    .section-heading { flex-wrap: wrap; gap: 8px; }
    .section-heading > span { font-size: 12px; }
    .playground, .specimens, .downloads { padding-top: 32px; }
    .controls { gap: 16px; padding-block: 22px 18px; }
    .controls select { font-size: 13px; padding-inline: 8px; }
    #specimen-text { min-height: 200px; }
    .font-details { display: block; }
    .font-details > div { margin-top: 10px; }
    .comparison { padding-block: 44px; }
    .comparison-grid { grid-template-columns: 1fr; column-gap: 0; margin-top: 24px; }
    .comparison-grid article { padding: 24px 0; border-bottom: 1px solid var(--line); }
    .comparison-grid article:last-child { padding-bottom: 0; border-bottom: 0; }
    .comparison-grid article::after { display: none; }
    .comparison-text { min-height: 0; }
    .comparison-body { margin-top: 16px; }
    .specimen-tabs { gap: 22px; margin-top: 16px; }
    .specimen-panel { padding-block: 32px 40px; }
    .reading-panel { grid-template-columns: 1fr; gap: 32px; }
    .reading-article { font-size: 18px; }
    .reading-article h3 { font-size: 33px; }
    .reading-notes { border-top: 1px solid var(--line); padding-top: 24px; }
    .reading-notes dl { display: grid; grid-template-columns: 80px 1fr; gap: 10px; }
    .reading-notes dt, .reading-notes dd { margin: 0; max-width: none; }
    .panel-caption { display: block; margin-bottom: 24px; }
    .panel-caption h3 { font-size: 25px; }
    .panel-caption p, .panel-caption label { display: block; margin-top: 12px; }
    .code-controls { flex-wrap: wrap; gap: 12px 24px; }
    .interface-demo { padding: 20px; }
    .interface-top { display: block; }
    .interface-top label { display: block; margin-top: 20px; }
    .interface-top input { min-width: 0; }
    .publication { grid-template-columns: 1fr; gap: 6px; }
    .publication .publication-subject { text-align: left; }
    .code-study { padding: 20px; }
    .code-study pre { font-size: 14px; }
    .equation { grid-template-columns: 1fr; gap: 12px; padding-block: 22px; }
    .equation math { font-size: 23px; }
    .language-row { grid-template-columns: 1fr; gap: 8px; }
    .language-row p { font-size: 21px; }
    .figure-study { font-size: 30px; }
    .display-study { grid-template-columns: 1fr; gap: 24px; }
    .display-serif, .display-sans { font-size: 60px; }
    .display-italic { font-size: 43px; }
    .display-sans { margin-top: 0; }
    .downloads { grid-template-columns: 1fr; gap: 24px; padding-block: 40px 48px; }
    .site-footer { flex-wrap: wrap; gap: 8px 24px; }
  }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  @media print {
    :root[data-theme] { color-scheme: light; --ground: #fff; --panel: #fff; --ink: #0a0a0a; --muted: rgba(10, 10, 10, 0.62); --faint: rgba(10, 10, 10, 0.45); --line: rgba(10, 10, 10, 0.14); --accent: #3f6212; --brand: #4d7c0f; }
    main, .site-header, .site-footer { width: 100%; }
    .site-header nav, .footer-links, .theme-toggle, .controls, .specimen-footer, .font-details, .specimen-tabs, .downloads, .site-footer, .load-status { display: none; }
    .intro { min-height: 0; padding-block: 20px; }
    .comparison, .specimens { break-before: page; }
    #specimen-text { resize: none; }
    .specimen-panel { min-height: 0; }
  }
}