/**
 * Can you read me now? Styles
 *
 * @title Can you read me now? Styles
 * @file playground.css
 * @purpose Styles the standalone APCA and WCAG contrast playground.
 * @created 2026-07-18
 * @updated 2026-07-18
 */

:root {
  --palette-canvas: oklch(99.11% 0 none);
  --palette-surface: oklch(100% 0 none);
  --palette-surface-muted: oklch(94.91% 0 none);
  --palette-text-strong: oklch(36% 0 none);
  --palette-text-muted: oklch(45.32% 0 none);
  --palette-accent: oklch(48.35% 0.1955 23.78);
  --palette-structural-accent: oklch(48.35% 0.1955 23.78);
  --palette-success: #16835d;
  --palette-success-foreground: #ffffff;
  --palette-border-soft: oklch(91.5% 0 none);
  --palette-border-strong: oklch(80% 0 none);
  --specimen-mark-neutral: rgb(0 0 0 / .62);
  --specimen-mark-neutral-border: rgb(255 255 255 / .82);
  --content-width: 920px;
  color-scheme: light dark;
  --font-body: 'Atkinson Hyperlegible', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Literata', Georgia, 'Times New Roman', serif;
  --font-ui: 'Geist Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 18px;
  font-family: var(--font-body);
}

@font-face {
  font-family: 'Geist Sans';
  src: url('./fonts/GeistSans.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Atkinson Hyperlegible';
  src: url('./fonts/AtkinsonHyperlegibleNext.woff2') format('woff2');
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Literata';
  src: url('./fonts/Literata700.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Literata';
  src: url('./fonts/LiterataItalic700.woff2') format('woff2');
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: 'Readable Specimen Inter';
  src: url('./fonts/InterVariable.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@media (prefers-color-scheme: dark) {
  :root {
    --palette-canvas: oklch(26.03% 0 none);
    --palette-surface: oklch(30.92% 0 none);
    --palette-surface-muted: oklch(34.07% 0 none);
    --palette-text-strong: oklch(92.49% 0 none);
    --palette-text-muted: oklch(88.84% 0 none);
    --palette-accent: oklch(56.72% 0.2132 18.31);
    --palette-structural-accent: oklch(64.11% 0.2073 20.05);
    --palette-success: #16835d;
    --palette-success-foreground: #ffffff;
    --palette-border-soft: oklch(40% 0 none);
    --palette-border-strong: oklch(52% 0 none);
  }
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--palette-text-strong); background: var(--palette-canvas); font-size: 1rem; line-height: 1.6; }
a { color: inherit; }
button, input { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); border: 0; white-space: nowrap; }

main { width: 100%; }
.playground { width: min(1180px, calc(100% - 40px)); min-height: 100svh; margin-inline: auto; padding: clamp(32px, 4vw, 56px) 0 48px; }
.playground-intro { width: min(100%, var(--content-width)); margin-inline: auto; }
h1 { margin: 0; font: italic 700 clamp(36px, 3.4vw, 48px)/1.12 var(--font-heading); letter-spacing: -.025em; text-wrap: pretty; }
.playground-intro p { max-width: 650px; margin: 24px 0 0; color: var(--palette-text-muted); font-size: clamp(1.05rem, 1.7vw, 1.2rem); line-height: 1.5; text-wrap: pretty; }
.playground-intro .intro-cta { margin-top: 8px; color: var(--palette-text-strong); font-weight: 650; }

.playground-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(20px, 3vw, 32px); align-items: start; margin-top: clamp(24px, 3vw, 36px); }
.specimen-stage { width: min(100%, var(--content-width)); min-width: 0; margin-inline: auto; }
.specimen { position: relative; width: 100%; height: clamp(260px, 24vw, 320px); min-height: 0; padding: clamp(28px, 5vw, 60px); display: grid; place-items: center; overflow: hidden; border: 1px solid var(--palette-border-strong); border-radius: 7px; }
.specimen p { width: 100%; margin: 0; font-family: 'Readable Specimen Inter', Inter, sans-serif; font-size: 14px; font-weight: 400; line-height: 1.4286; text-align: left; text-wrap: balance; overflow-wrap: break-word; }
.specimen-mark { position: absolute; right: 12px; bottom: 12px; display: grid; place-items: center; width: 38px; height: 38px; border: 1.5px solid var(--specimen-mark-neutral-border); border-radius: 999px; color: transparent; background: var(--specimen-mark-neutral); font: 800 20px/1 var(--font-ui); transition: color 160ms ease, background 160ms ease, border-color 160ms ease; }
.specimen[data-pass='true'] .specimen-mark { border-color: var(--palette-success); color: var(--palette-success-foreground); background: var(--palette-success); }

.result { width: 100%; min-height: 34px; display: grid; grid-template-columns: minmax(0, 1fr); align-items: center; padding: 6px 4px 5px; border-bottom: 2px solid var(--palette-border-soft); }
.result > div { min-width: 0; }
.result strong { display: block; font: 650 14px/1.25 var(--font-ui); }
.result p { display: none; }
.result[data-pass='true'] { border-bottom-color: var(--palette-success); }

.controls { width: min(100%, var(--content-width)); margin-inline: auto; display: grid; grid-template-columns: minmax(0, 1fr); gap: 44px; padding: clamp(34px, 4vw, 46px); border: 1px solid var(--palette-border-strong); border-radius: 7px; background: var(--palette-surface); }
fieldset { width: min(100%, 780px); min-width: 0; margin: 0 auto; padding: 0; border: 0; }
legend { grid-column: 1 / -1; width: 100%; margin-bottom: 8px; padding: 0 0 14px; border-bottom: 1px solid var(--palette-border-soft); font: 700 24px/1.2 var(--font-heading); }
.section-rail { display: none; }
.color-controls { display: grid; grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr); gap: 18px clamp(12px, 2vw, 20px); }
.slider-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 28px; align-items: center; padding-top: 20px; border-top: 1px solid var(--palette-border-soft); }
.slider-controls .field-guidance { grid-column: 1 / -1; margin-top: 0; }
.color-control, .slider-control { display: grid; align-content: start; gap: 12px; margin-top: 16px; color: var(--palette-text-strong); font: 650 .889rem/1.3 var(--font-ui); }
.color-control { grid-template-columns: max-content minmax(0, 1fr); align-items: center; }
.color-control > span:first-child { white-space: nowrap; }
.color-control .input-error { grid-column: 2; }
.slider-control { grid-template-columns: 110px minmax(0, 1fr); align-items: center; gap: 16px; margin-top: 0; }
.color-entry { display: grid; grid-template-columns: 48px minmax(0, 1fr); overflow: hidden; border: 1px solid var(--palette-border-strong); border-radius: 7px; background: var(--palette-canvas); }
.color-entry:focus-within { outline: 4px solid var(--palette-structural-accent); outline-offset: 3px; }
.color-swatch { position: relative; width: 48px; height: 48px; padding: 7px; border-right: 1px solid var(--palette-border-soft); }
.color-swatch::before { position: absolute; inset: 7px; background: conic-gradient(var(--palette-surface-muted) 25%, var(--palette-surface) 0 50%, var(--palette-surface-muted) 0 75%, var(--palette-surface) 0) 0 0 / 12px 12px; content: ''; }
.color-swatch::after { position: absolute; inset: 7px; border: 1px solid var(--palette-border-strong); background: var(--swatch-color); content: ''; }
#foreground-swatch { --swatch-color: #a1a1a1; }
#background-swatch { --swatch-color: #000000; }
input[type='text'] { min-width: 0; padding: 12px 14px; border: 0; outline: 0; background: transparent; color: var(--palette-text-strong); font: 600 .944rem/1.2 var(--font-ui); font-variant-numeric: tabular-nums; }
input[type='text'][aria-invalid='true'] { color: var(--palette-accent); }
.input-error { color: var(--palette-text-muted); font: 500 12px/1.3 var(--font-ui); }
.input-error:empty { display: none; }
.field-guidance { grid-column: 1 / -1; margin: 4px 0 0; color: var(--palette-text-muted); font: 500 .833rem/1.55 var(--font-ui); }
.field-guidance a { color: var(--palette-text-strong); text-underline-offset: .2em; }
.swap-control { display: grid; place-items: center; min-height: 50px; margin-top: 16px; }
.swap-colors { align-self: center; display: grid; place-items: center; width: 42px; height: 42px; margin: 0; padding: 0; border: 1px solid var(--palette-border-strong); border-radius: 999px; color: var(--palette-text-strong); background: var(--palette-canvas); font: 600 22px/1 var(--font-ui); cursor: pointer; }
.swap-colors:hover { background: var(--palette-surface-muted); }
.swap-colors:focus-visible { outline: 4px solid var(--palette-structural-accent); outline-offset: 3px; }
.slider-control > span { display: flex; justify-content: space-between; gap: 16px; }
.slider-control output { color: var(--palette-text-strong); font: 700 .889rem/1.3 var(--font-ui); font-variant-numeric: tabular-nums; }
input[type='range'] { width: 100%; margin: 0; accent-color: var(--palette-accent); cursor: pointer; }
input[type='range']:focus-visible { outline: 4px solid var(--palette-structural-accent); outline-offset: 5px; }

.measurements { width: min(100%, 780px); margin-inline: auto; grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: 24px; padding-top: 32px; border-top: 1px solid var(--palette-border-soft); }
.measurement { display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; font-family: var(--font-ui); }
.measurement + .measurement { padding-left: 24px; border-left: 1px solid var(--palette-border-soft); }
.measurement-label { align-self: end; display: flex; align-items: center; gap: 9px; color: var(--palette-text-muted); font-size: .833rem; font-weight: 650; }
.measurement output { grid-row: 1 / span 2; grid-column: 2; align-self: center; font: 700 clamp(30px, 3vw, 42px)/1 var(--font-heading); font-variant-numeric: tabular-nums; }
.measurement > span:last-child { color: var(--palette-text-muted); font-size: .833rem; }
.wcag-mark { display: inline-grid; place-items: center; width: 22px; height: 22px; border: 1.5px solid var(--palette-border-strong); border-radius: 999px; color: transparent; font: 800 13px/1 var(--font-ui); transition: color 160ms ease; }
.measurement[data-pass='true'] .wcag-mark { color: var(--palette-success); }

@media (min-width: 781px) {
  .controls { row-gap: 16px; }
  .color-controls,
  .slider-controls { position: relative; width: min(calc(100% - 56px), 780px); }
  .color-controls { grid-template-columns: max-content minmax(0, 1fr) 42px max-content minmax(0, 1fr); }
  .slider-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-block-start: 28px; }
  .color-controls legend,
  .slider-controls legend { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); border: 0; white-space: nowrap; }
  .section-rail { position: absolute; inset-block: 0; left: -42px; display: grid; width: 22px; place-items: center; font: 750 18px/1 var(--font-ui); letter-spacing: .1em; text-transform: uppercase; writing-mode: vertical-rl; transform: rotate(180deg); }
  .color-control { grid-column: span 2; grid-template-columns: subgrid; margin-top: 0; }
  .color-control[for='foreground-text'] { grid-column: 1 / span 2; grid-row: 1; }
  .swap-control { grid-column: 3; grid-row: 1; margin-top: 0; }
  .color-control[for='background-text'] { grid-column: 4 / span 2; grid-row: 1; }
  .color-controls .field-guidance { grid-column: 1 / -1; grid-row: 2; }
  .slider-control[for='font-size'] { grid-column: 1; grid-row: 1; }
  .slider-control[for='font-weight'] { grid-column: 2; grid-row: 1; }
  .slider-controls .field-guidance { grid-column: 1 / -1; grid-row: 2; }
  #wcag-guidance { white-space: nowrap; }
}

.apca-context { width: min(100%, var(--content-width)); margin: 64px auto 0; display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(32px, 5vw, 64px); padding-top: 40px; border-top: 1px solid var(--palette-border-soft); }
.apca-explainer h2 { margin: 0; font: 700 clamp(27px, 3vw, 36px)/1.1 var(--font-heading); letter-spacing: -.02em; }
.apca-explainer p { margin: 16px 0 0; color: var(--palette-text-strong); font-size: 1.111rem; line-height: 1.6; }
.apca-explainer a { color: var(--palette-text-strong); text-underline-offset: .2em; }
.apca-bands { border-top: 1px solid var(--palette-border-strong); }
.apca-band { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 18px; align-items: baseline; padding: 15px 0; border-bottom: 1px solid var(--palette-border-soft); }
.apca-band strong { font: 700 20px/1 var(--font-heading); font-variant-numeric: tabular-nums; }
.apca-band span { color: var(--palette-text-muted); font: 600 .944rem/1.4 var(--font-ui); }
footer { width: min(var(--content-width), calc(100% - 40px)); margin-inline: auto; padding: 24px 0 40px; border-top: 1px solid var(--palette-border-soft); color: var(--palette-text-muted); font: .833rem/1.6 var(--font-ui); }
footer p { margin: 0; }
footer a { color: var(--palette-text-strong); text-underline-offset: .2em; }

@media (max-width: 780px) {
  .playground { width: min(100% - 32px, 1180px); min-height: 100svh; padding-top: 28px; }
  h1 { font-size: 34px; }
  .playground-intro p { margin-top: 16px; }
  .playground-intro .intro-cta { margin-top: 6px; }
  .playground-layout { grid-template-columns: 1fr; gap: 16px; margin-top: 20px; }
  .specimen-stage { position: sticky; top: 8px; z-index: 10; background: var(--palette-canvas); }
  .specimen { height: 160px; min-height: 0; padding: 14px; }
  .specimen-mark { right: 10px; bottom: 10px; width: 32px; height: 32px; font-size: 17px; }
  .result { min-height: 32px; padding-block: 5px 4px; }
  .controls { grid-template-columns: 1fr; gap: 26px; padding: 22px 16px; border-radius: 7px; }
  legend { margin-bottom: 4px; padding-bottom: 10px; font-size: 22px; }
  .color-controls { position: relative; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 10px; }
  .slider-controls { grid-template-columns: minmax(0, 1fr); gap: 14px; padding-top: 0; border-top: 0; }
  .slider-controls .field-guidance { grid-column: 1 / -1; margin-top: 0; }
  .color-control, .slider-control { grid-template-columns: minmax(0, 1fr); gap: 8px; margin-top: 10px; font-size: .82rem; }
  .slider-controls .slider-control { margin-top: 0; }
  .color-control .input-error { grid-column: 1; }
  .color-entry { grid-template-columns: 38px minmax(0, 1fr); }
  .color-swatch { width: 38px; height: 44px; padding: 6px; }
  .color-swatch::before, .color-swatch::after { inset: 6px; }
  input[type='text'] { padding: 10px 7px; font-size: .78rem; }
  .slider-control output { font-size: .82rem; }
  .swap-control { position: absolute; top: -44px; left: 86px; display: block; margin: 0; }
  .swap-colors { width: 36px; height: 36px; font-size: 19px; }
  .field-guidance { grid-column: 1 / -1; margin-top: 0; font-size: .78rem; }
  .measurements { grid-column: auto; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; padding-top: 24px; }
  .measurement { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .measurement + .measurement { padding: 0 0 0 16px; border-top: 0; border-left: 1px solid var(--palette-border-soft); }
  .measurement output { grid-row: auto; grid-column: auto; font-size: 28px; }
  .measurement-label, .measurement > span:last-child { font-size: .75rem; }
  .wcag-mark { width: 18px; height: 18px; font-size: 11px; }
  .controls :is(input, button, a) { scroll-margin-top: 214px; }
  .apca-context { grid-template-columns: 1fr; gap: 28px; margin-top: 48px; padding-top: 32px; }
  footer { width: min(100% - 32px, 1180px); }
}

@media (max-width: 780px) and (max-height: 700px) {
  .specimen { height: 130px; padding: 10px; }
  .controls :is(input, button, a) { scroll-margin-top: 184px; }
}

@media (max-width: 35rem) {
  :root { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  .specimen-mark, .wcag-mark { transition: none; }
}