@charset "UTF-8";
:root {
  --ink: #171717;
  --paper: #ffffff;
  --stage: #f2f2f2;
  --muted: #626262;
  --line: #d1d1d1;
  --control-line: #858585;
  --font: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"] { --ink: #f2f2ef; --paper: #111111; --stage: #1d1d1d; --muted: #b8b8b3; --line: #3e3e3b; --control-line: #a1a19c; color-scheme: dark; }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) { --ink: #f2f2ef; --paper: #111111; --stage: #1d1d1d; --muted: #b8b8b3; --line: #3e3e3b; --control-line: #a1a19c; color-scheme: dark; } }
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
button, input, select { font: inherit; color: inherit; }
button, select { cursor: pointer; }
button { min-height: 44px; min-width: 44px; padding: 10px 17px; border: 1px solid var(--control-line); background: transparent; border-radius: 0; line-height: 1.25; }
button:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
button[disabled] { cursor: default; opacity: .55; }
a { color: inherit; text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 5px; }
button:focus-visible:hover { outline-offset: 5px; }
[hidden] { display: none !important; }
::selection { background: #fd5852; color: #171717; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 500; }
h1 { font-size: clamp(44px, 5vw, 64px); line-height: .99; letter-spacing: -.06em; }
h2 { font-size: clamp(27px, 3vw, 39px); line-height: 1.15; letter-spacing: -.04em; }
h3 { font-size: 21px; line-height: 1.3; letter-spacing: -.025em; }
p + p { margin-top: 16px; }
svg { display: block; width: 100%; height: 100%; overflow: visible; }
.shell { max-width: 1400px; margin: 0 auto; padding: 0 56px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 24px 40px; min-height: 82px; padding-top: 38px; border-bottom: 1px solid var(--line); }
.site-title { font-size: 21px; line-height: 1.3; letter-spacing: normal; font-weight: 500; }
.site-title a { text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.clock-study { padding-top: 0; }
main { padding-bottom: 75px; }
.wordmark { font-family: var(--font); font-size: 21px; font-weight: 700; letter-spacing: -.02em; text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.wordmark span { padding-left: 2px; }
nav { display: flex; flex-wrap: wrap; gap: 40px; }
.site-navigation { align-items: center; color: var(--muted); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
.site-navigation > .mobile-menu-legal { display: none; }
.site-controls { display: none; }
nav a { font-size: 16px; min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
nav a:hover { text-decoration: none; }
.site-navigation > a, .site-footer a { position: relative; text-decoration: none; }
.site-navigation > a::after, .site-footer a::after {
  content: "";
  display: block;
  position: absolute;
  right: 0;
  bottom: 7px;
  left: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms ease;
}
.site-navigation > a::after, .footer-end a::after { transform-origin: right center; }
.footer-start a::after { transform-origin: left center; }
.site-navigation > a:hover::after, .site-footer a:hover::after { transform: scaleX(1); }
.theme-toggle { min-width: auto; padding: 0 2px; border: 0; background: transparent; font-size: 16px; }
.theme-toggle:hover { background: transparent; color: inherit; text-decoration: none; }
.mobile-menu-toggle { display: none; position: relative; width: 44px; padding: 0; border: 0; background: transparent; }
.mobile-menu-toggle:hover { background: transparent; color: inherit; }
.mobile-menu-toggle span { position: absolute; top: 50%; left: 13px; width: 18px; height: 1px; background: currentColor; transition: transform 180ms ease; }
.mobile-menu-toggle span:first-child { transform: translateY(-4px); }
.mobile-menu-toggle span:last-child { transform: translateY(4px); }
.mobile-menu-toggle[aria-expanded="true"] span:first-child { transform: rotate(45deg); }
.mobile-menu-toggle[aria-expanded="true"] span:last-child { transform: rotate(-45deg); }
.language-picker { display: inline-flex; gap: 12px; }
.language-picker a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; }
.consent-option { display: flex; align-items: center; gap: 12px; min-height: 44px; cursor: pointer; font-size: 15px; }
.consent-option input { width: 22px; height: 22px; min-height: 22px; flex: 0 0 22px; accent-color: var(--ink); }
.privacy-link { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; }
.test-results-link { margin-top: 18px; }
.test-results-link a { display: inline-flex; align-items: center; gap: 20px; min-height: 44px; color: var(--ink); }
.save-panel { margin-top: 24px; }
.save-retry { margin-top: 12px; }
.receipt-panel { margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--line); }
.receipt-panel h3 { font-size: 18px; }
.receipt-panel label { display: block; margin-top: 15px; font-size: 14px; }
.receipt-code-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: stretch; gap: 10px; margin-top: 8px; }
.receipt-panel input { width: 100%; min-width: 0; font-size: 13px; }
.receipt-panel .copy-receipt { height: auto; white-space: nowrap; }
.receipt-actions { justify-content: flex-start; }
.receipt-actions [aria-disabled="true"] { opacity: .55; pointer-events: none; }
.intro { padding: 72px 0 68px; }
.intro-copy { max-width: 850px; }
.intro-copy h2 { font-size: clamp(34px, 4.5vw, 60px); line-height: 1.05; letter-spacing: -.055em; }
.intro-copy p { max-width: 720px; margin-top: 24px; font-size: 19px; line-height: 1.5; color: var(--muted); }
.clock-intro-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 54px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.clock-intro-list article { padding: 24px 28px 27px 0; }
.clock-intro-list article + article { padding-left: 28px; border-left: 1px solid var(--line); }
.clock-intro-list h3 { font-size: 18px; }
.clock-intro-list p { max-width: 310px; margin-top: 8px; font-size: 15px; line-height: 1.5; color: var(--muted); }
.concept-picker { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-bottom: 1px solid var(--ink); }
.concept-picker button { text-align: left; padding: 18px 24px; border: 0; border-top: 1px solid var(--line); font-size: 19px; min-height: 70px; }
.concept-picker button + button { border-left: 1px solid var(--line); }
.concept-picker button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.concept-index { margin-right: 18px; font-size: 12px; font-variant-numeric: tabular-nums; vertical-align: 2px; }
.stage { background: var(--stage); min-height: 484px; padding: 24px 28px 22px; position: relative; }
.stage-heading { display: flex; align-items: center; justify-content: flex-end; gap: 20px; }
.guide-option { display: inline-flex; gap: 8px; align-items: center; min-height: 44px; font-size: 14px; cursor: pointer; margin-right: auto; }
.guide-option input { width: 20px; height: 20px; min-height: 20px; flex: 0 0 20px; accent-color: var(--ink); }
.guide-options { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 22px; margin-right: auto; }
.guide-options .guide-option { margin-right: 0; }
.test-guide-options { margin-bottom: 16px; }
.stage-heading h2 { font-size: 20px; letter-spacing: -.025em; }
.text-button { border: 0; font-size: 14px; padding: 10px 0 10px 12px; }
.text-button:hover { background: transparent; color: var(--ink); text-decoration: underline 1px; text-underline-offset: 4px; }
.text-button span { margin-left: 12px; }
.main-clock { display: flex; justify-content: center; align-items: center; height: 365px; }
.glyph { width: 330px; height: 330px; color: var(--ink); }
.visual-time { display: block; margin: -11px auto 0; text-align: center; font-size: 18px; font-variant-numeric: tabular-nums; }
.stage-caption { font-size: 14px; color: var(--muted); text-align: center; }
.screensaver-download { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 28px; padding: 12px 0; }
.screensaver-download h3 { font-size: 14px; }
.screensaver-platforms { display: flex; align-items: center; flex-wrap: wrap; gap: 32px; }
.screensaver-platform { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 9px; width: auto; min-height: 44px; padding: 8px 0; border: 0; background: transparent; color: var(--ink); text-decoration: none; }
.screensaver-platform-icon { width: 20px; height: 20px; flex: 0 0 20px; }
.screensaver-platform strong { font-size: 15px; font-weight: 400; line-height: 1; white-space: nowrap; }
.screensaver-platform::after { content: ""; position: absolute; right: 0; bottom: 3px; left: 0; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left center; transition: transform 180ms ease; }
.screensaver-platform:last-child::after { transform-origin: left center; }
a.screensaver-platform:hover { background: transparent; color: inherit; }
a.screensaver-platform:hover::after { transform: scaleX(1); }
.time-controls { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px 22px; padding: 22px 0 16px; }
.time-input-wrap { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }
.time-input-wrap label { font-size: 14px; }
input, select { background: var(--paper); border: 1px solid var(--control-line); border-radius: 0; min-height: 44px; padding: 8px 12px; }
input[type="time"] { width: 126px; font-size: 17px; font-variant-numeric: tabular-nums; }
#mobile-time-display { display: none; }
#clock-mode { color: var(--muted); font-size: 13px; }
.step-controls, .cycle-controls { display: flex; gap: 8px; }
.accessibility-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.accessibility-actions button { font-size: 14px; }
.step-controls button, .preview-button { font-size: 14px; }
.step-controls #now[aria-pressed="true"] { box-shadow: inset 0 -3px var(--ink); }
.preview-button { border-color: var(--ink); }
.preview-button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.preview-button span { margin-left: 14px; }
.control-note { color: var(--muted); font-size: 13px; padding-bottom: 25px; }
.error { flex-basis: 100%; font-size: 15px; font-weight: 600; border-left: 3px solid var(--ink); padding-left: 12px; }
.rule-wrap { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
details > summary { list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 24px; cursor: pointer; min-height: 68px; padding: 17px 0; font-size: 17px; }
details > summary::-webkit-details-marker { display: none; }
details > summary > span { font-size: 23px; font-weight: 400; }
details[open] > summary > span { transform: rotate(45deg); }
.rule-content { padding: 12px 0 36px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.rule-content h3 { margin-bottom: 18px; font-size: 27px; }
.rule-content ol { margin: 0; padding-left: 21px; }
.rule-content li { margin-bottom: 10px; padding-left: 5px; }
.rule-example { background: var(--stage); padding: 26px 30px; }
.rule-example .example-equation { font-size: 25px; letter-spacing: -.035em; margin: 14px 0; }
.rule-example p { font-size: 15px; }
.section { padding-top: 94px; scroll-margin-top: 22px; }
.section-heading { margin-bottom: 32px; max-width: 730px; }
.section-heading p { margin-top: 15px; color: var(--muted); }
.examples-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 22px 16px; }
.example-button { border: 0; padding: 0; text-align: left; }
.example-button .example-image { display: block; aspect-ratio: 1; background: var(--stage); padding: 15px; border: 2px solid transparent; }
.example-button .example-time { display: block; padding: 11px 1px 1px; font-size: 14px; font-variant-numeric: tabular-nums; }
.example-button:hover { background: transparent; color: var(--ink); }
.example-button:hover .example-image, .example-button[aria-pressed="true"] .example-image { border-color: var(--ink); }
.example-button[aria-pressed="true"] .example-time { font-weight: 700; }
.comparison-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.comparison-figure { background: var(--stage); aspect-ratio: 1; display: grid; place-items: center; padding: 22px; }
.comparison-figure .glyph { width: 100%; height: 100%; }
.comparison-item h3 { margin-top: 23px; font-size: 24px; }
.comparison-item .principle { font-size: 15px; color: var(--muted); margin-top: 5px; }
.comparison-item dl { margin: 24px 0; font-size: 15px; }
.comparison-item dt { font-weight: 600; margin-top: 15px; }
.comparison-item dd { margin: 5px 0 0; color: var(--muted); }
.comparison-item button { font-size: 14px; width: 100%; margin-top: 18px; }
.recommendation { max-width: 770px; padding: 52px 0 45px; }
.section-label { display: block; color: var(--muted); font-size: 14px; margin-bottom: 13px; }
.recommendation h3 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 19px; }
.muted { color: var(--muted); }
.wide-details { border-top: 1px solid var(--line); }
.wide-details:last-child { border-bottom: 1px solid var(--line); }
.reference-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; padding: 18px 0; }
.reference-grid h3 { margin-bottom: 13px; }
.reference-grid p, .reference-grid a { font-size: 15px; }
.reference-grid a { display: inline-block; margin-top: 18px; line-height: 1.7; min-height: 44px; }
.detail-note { font-size: 14px; color: var(--muted); max-width: 860px; }
.wide-details > .detail-note { padding: 0 0 27px; }
.test-setup { display: grid; grid-template-columns: 1fr 1fr auto; gap: 22px; align-items: end; margin-bottom: 21px; }
.test-setup label { display: block; font-size: 14px; margin-bottom: 9px; }
.test-setup select { width: 100%; }
.primary-button { background: var(--ink); border-color: var(--ink); color: var(--paper); padding: 12px 21px; }
.primary-button:hover { background: #393939; color: var(--paper); }
.primary-button span { margin-left: 26px; }
.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; padding-bottom: 37px; }
.evidence-grid h3 { margin-bottom: 17px; }
.evidence-grid p { max-width: 490px; }
.evidence-value { font-size: 20px; letter-spacing: -.025em; margin-top: 23px; padding: 17px 0; border-top: 1px solid var(--line); }
.audit-copy { max-width: 810px; padding: 12px 0 32px; }
.audit-copy h3 { margin-bottom: 15px; }
.audit-copy ul { padding-left: 20px; margin: 0 0 30px; }
.audit-copy li { padding-left: 4px; margin-bottom: 11px; }
.audit-copy a { display: inline-block; margin-top: 22px; min-height: 44px; }
.heuristics { display: grid; grid-template-columns: 1fr 1fr; gap: 32px 52px; padding: 20px 0 36px; }
.heuristics article h3 { font-size: 19px; margin-bottom: 10px; }
.heuristics article p { font-size: 15px; }
.heuristics article span { display: block; margin-top: 9px; font-size: 14px; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); margin-top: 85px; padding: 29px 0 40px; display: flex; align-items: center; justify-content: space-between; gap: 18px 40px; font-size: 13px; color: var(--muted); }
.site-footer p { margin: 0; }
.site-footer a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.site-footer a:hover { text-decoration: none; }
.footer-start { display: flex; align-items: center; gap: 18px; }
.footer-start > a { display: block; width: auto; min-height: 16px; font-size: 16px; line-height: 16px; }
.footer-start > a::after { bottom: -5px; }
.site-footer .theme-toggle { position: relative; display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; min-width: 24px; min-height: 24px; padding: 0; color: var(--ink); }
.site-footer .theme-toggle::after { content: ""; position: absolute; right: 4px; bottom: -3px; left: 4px; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left center; transition: transform 160ms ease; }
.site-footer .theme-toggle:hover::after { transform: scaleX(1); }
.theme-icon { display: block; width: 13px; height: 13px; border: 1px solid currentColor; border-radius: 50%; background: linear-gradient(90deg, transparent 50%, currentColor 50%); }
.footer-end { margin-left: auto; display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 12px 28px; }
.footer-legal { display: flex; align-items: center; gap: 9px; }
.footer-legal a { font-size: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 20; padding: 12px 20px; background: var(--ink); color: var(--paper); }
.skip-link:focus { top: 20px; }
dialog { color: var(--ink); background: var(--paper); border: 1px solid var(--ink); padding: 30px; }
dialog::backdrop { background: rgb(0 0 0 / 65%); }
.focus-dialog { width: 100%; height: 100dvh; max-width: none; max-height: none; border: 0; padding: 32px; }
.focus-dialog[open] { display: flex; flex-direction: column; align-items: center; justify-content: center; }
.focus-glyph { width: min(82vw, 82dvh); height: min(82vw, 82dvh); }
.focus-guide-controls { position: absolute; bottom: 28px; left: 32px; max-width: calc(100vw - 180px); margin: 0; padding: 0; background: var(--paper); opacity: 1; transition: opacity 160ms ease; }
#focus-close { position: absolute; bottom: 28px; right: 32px; border: 0; font-size: 14px; opacity: 1; transition: opacity 160ms ease; }
#focus-close span { margin-left: 20px; }
.focus-dialog.controls-hidden #focus-close, .focus-dialog.controls-hidden .focus-guide-controls { opacity: 0; pointer-events: none; }
.focus-dialog.controls-hidden { cursor: none; }
.focus-dialog[data-concept="zwischenraum"] { background: #171717; color: #ffffff; }
.focus-dialog[data-concept="zwischenraum"] .focus-glyph { width: min(94vw, 94dvh); height: min(94vw, 94dvh); overflow: hidden; background: #ffffff; color: #171717; }
.focus-dialog[data-concept="zwischenraum"] .focus-glyph svg { transform: scale(1.35); transform-origin: center; }
.focus-dialog[data-concept="zwischenraum"] .inactive-slots-strong { stroke: #ffffff; }
.focus-dialog[data-concept="zwischenraum"] .focus-guide-controls { background: #171717; color: #ffffff; }
.focus-dialog[data-concept="zwischenraum"] .focus-guide-controls input { accent-color: #ffffff; }
.focus-dialog[data-concept="zwischenraum"] #focus-close { color: #ffffff; }
body:has(dialog[open]) { overflow: hidden; }
.test-dialog { width: min(690px, calc(100vw - 32px)); max-height: calc(100dvh - 32px); padding: 24px 30px 30px; overflow-y: auto; }
.test-dialog-top { display: flex; justify-content: space-between; align-items: center; gap: 15px; margin-bottom: 25px; font-size: 14px; }
.test-dialog-top button { border: 0; padding-right: 0; font-size: 14px; }
#trial-title { font-size: 30px; letter-spacing: -.035em; }
.trial-progress { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.trial-glyph { width: min(300px, 70vw); height: min(300px, 70vw); margin: 14px auto; }
.trial-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 23px; }
.trial-actions button { font-size: 15px; }
.answer-form { margin-top: 22px; }
.answer-form label { display: block; font-size: 15px; margin-bottom: 10px; }
.answer-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.answer-row input { width: 160px; font-size: 23px; font-variant-numeric: tabular-nums; }
.trial-introduction { margin: 24px 0; }
.trial-introduction ol { padding-left: 20px; }
.trial-introduction li { margin-bottom: 12px; }
.result-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 24px 0; }
.result-stat { background: var(--stage); padding: 20px; }
.result-stat strong { display: block; font-size: 32px; font-weight: 500; letter-spacing: -.04em; }
.result-stat span { font-size: 14px; }
.results-list { margin: 22px 0; padding: 0; list-style: none; }
.results-list li { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; border-top: 1px solid var(--line); padding: 10px 0; font-size: 14px; font-variant-numeric: tabular-nums; }
.last-result { padding: 22px 25px; margin-top: 28px; background: var(--stage); }
.last-result h3 { margin-bottom: 12px; }
.last-result button { margin-top: 16px; }
.result-export { margin-top: 26px; padding-top: 23px; border-top: 1px solid var(--line); }
.result-export label { display: block; margin-bottom: 10px; font-size: 15px; }
.result-export textarea { width: 100%; min-height: 160px; max-width: 100%; resize: vertical; padding: 12px; border: 1px solid var(--control-line); border-radius: 0; color: var(--ink); background: var(--paper); font: 13px/1.5 ui-monospace, monospace; }
.result-export .trial-actions { justify-content: flex-start; margin: 13px 0; }
.result-download { min-height: 44px; display: inline-flex; align-items: center; padding: 10px 16px; border: 1px solid var(--control-line); font-size: 15px; }
.noscript-note { padding: 24px; border: 2px solid var(--ink); margin: 24px; }
@media (max-width: 1000px) {
  .shell { padding: 0 30px; }
  .intro { padding: 56px 0 54px; }
  .time-controls { justify-content: flex-start; }
  .preview-button { margin-left: auto; }
  .concept-picker button { padding: 18px 18px; font-size: 17px; }
  .concept-index { margin-right: 10px; }
  .examples-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .comparison-grid { gap: 20px; }
  .comparison-figure { padding: 14px; }
  .test-setup { grid-template-columns: 1fr 1fr; }
  .test-setup button { grid-column: 1 / -1; justify-self: start; }
}
@media (max-width: 680px) {
  .shell { padding: 0 22px; }
  .site-header { min-height: 60px; gap: 16px; flex-wrap: nowrap; align-items: flex-start; padding: 24px 0 0; }
  .mobile-menu-toggle { display: flex; align-items: center; justify-content: center; margin: -6px -10px 0 auto; z-index: 42; }
  .site-header .site-navigation { position: fixed; inset: 0; z-index: 40; display: flex; width: 100%; height: 100dvh; flex-direction: column; align-items: flex-start; justify-content: center; gap: 24px; padding: 112px 24px 120px; background: var(--paper); color: var(--ink); visibility: hidden; opacity: 0; pointer-events: none; transition: opacity 180ms ease, visibility 180ms ease; }
  .site-header[data-menu-open="true"] .site-navigation { visibility: visible; opacity: 1; pointer-events: auto; }
  .site-header[data-menu-open="true"] .site-navigation > a { display: block; width: auto; min-height: 0; font-size: 28px; line-height: 1.1; text-align: left; }
  .site-header[data-menu-open="true"] .site-navigation > a::after { bottom: -5px; }
  .site-header[data-menu-open="true"] .mobile-menu-legal { position: fixed; right: 24px; bottom: 50px; display: flex; gap: 9px; align-items: center; }
  .site-header[data-menu-open="true"] .mobile-menu-legal a { min-height: 44px; font-size: 14px; }
  .site-header[data-menu-open="true"] .mobile-menu-toggle { position: fixed; top: 24px; right: 12px; margin-top: -6px; margin-right: 0; }
  .site-header[data-menu-open="true"] .site-title, .site-header[data-menu-open="true"] > .wordmark { position: relative; z-index: 42; }
  .site-header[data-menu-open="true"] .site-controls { position: fixed; left: 12px; bottom: 50px; z-index: 43; display: flex; align-items: center; }
  .site-header .site-controls > a, .site-header .site-controls > button { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; min-width: 44px; min-height: 44px; padding: 0; border: 0; background: transparent; color: var(--ink); font-size: 14px; line-height: 1; text-decoration: none; }
  .site-header .site-controls > a:hover, .site-header .site-controls > button:hover { background: transparent; color: var(--ink); text-decoration: underline; }
  body.mobile-menu-open { overflow: hidden; }
  .site-title { max-width: none; }
  .clock-study { padding-top: 0; }
  .wordmark { font-size: 21px; }
  nav { gap: 16px; }
  nav a { font-size: 13px; }
  .site-header .site-navigation a { font-size: 16px; }
  .theme-toggle { font-size: 16px; }
  .intro { padding: 44px 0 42px; }
  .intro-copy h2 { font-size: clamp(32px, 10vw, 44px); }
  .intro-copy p { font-size: 17px; margin-top: 19px; }
  .clock-intro-list { grid-template-columns: 1fr; margin-top: 37px; }
  .clock-intro-list article { padding: 18px 0 20px; }
  .clock-intro-list article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .clock-intro-list p { max-width: 420px; margin-top: 5px; }
  .concept-picker button { padding: 13px 8px; font-size: 14px; min-height: 52px; }
  .concept-index { display: block; margin: 0 0 4px; font-size: 11px; }
  .stage { min-height: 396px; padding: 14px 16px 18px; }
  .stage-heading { gap: 10px; }
  .stage-heading h2 { font-size: 16px; }
  .text-button { font-size: 12px; padding-left: 2px; }
  .text-button span { margin-left: 5px; }
  .main-clock { height: 306px; }
  .main-clock .glyph { width: 258px; height: 258px; max-width: 100%; }
  .stage-caption { font-size: 12px; }
  .screensaver-platforms { gap: 24px; }
  .time-controls { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: stretch; gap: 8px; padding-top: 19px; }
  .time-input-wrap { position: relative; display: block; grid-column: 1; min-width: 0; }
  .time-input-wrap label { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
  .time-input-wrap input[type="time"] { position: absolute; inset: 0; z-index: 2; width: 100%; height: 100%; min-width: 0; opacity: 0; }
  #mobile-time-display { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; min-height: 44px; padding: 9px 6px; border: 1px solid var(--control-line); font-size: 13px; font-variant-numeric: tabular-nums; }
  .time-input-wrap:focus-within #mobile-time-display { outline: 3px solid var(--ink); outline-offset: 3px; }
  .step-controls { display: contents; }
  .step-controls button { width: 100%; min-width: 0; padding: 9px 6px; font-size: 13px; }
  .cycle-controls, .accessibility-actions { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; width: 100%; }
  .cycle-controls button, .accessibility-actions button { width: 100%; min-width: 0; }
  .preview-button { margin-left: 0; font-size: 13px; padding: 11px 8px; }
  .preview-button span { margin-left: 6px; }
  .control-note { padding-bottom: 17px; font-size: 12px; }
  .rule-content { grid-template-columns: 1fr; gap: 22px; padding-bottom: 24px; }
  .rule-content h3 { font-size: 24px; }
  .rule-example { padding: 23px; }
  .section { padding-top: 61px; }
  .section-heading { margin-bottom: 25px; }
  .section-heading p { font-size: 15px; }
  .examples-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px 10px; }
  .example-button .example-image { padding: 7px; }
  .example-button .example-time { font-size: 13px; }
  .comparison-grid { grid-template-columns: 1fr; gap: 39px; }
  .comparison-figure { max-width: 360px; width: 100%; margin: auto; padding: 26px; }
  .comparison-item h3 { margin-top: 17px; }
  .comparison-item dl { margin: 17px 0; }
  .recommendation { padding: 40px 0 28px; }
  .reference-grid { grid-template-columns: 1fr; gap: 29px; }
  .test-setup { grid-template-columns: 1fr; gap: 18px; }
  .test-setup button { width: 100%; }
  .evidence-grid { grid-template-columns: 1fr; gap: 27px; }
  .heuristics { grid-template-columns: 1fr; gap: 27px; }
  .site-footer { margin-top: 54px; padding-bottom: 27px; align-items: flex-start; }
  .footer-end { align-items: flex-end; flex-direction: column; gap: 2px; }
  .test-dialog { padding: 18px 20px 24px; }
  .test-dialog-top { margin-bottom: 18px; }
  #trial-title { font-size: 26px; }
  .result-stat { padding: 16px; }
  .result-stat strong { font-size: 28px; }
  .focus-dialog { padding: 18px; }
  .focus-glyph { width: min(88vw, 76dvh); height: min(88vw, 76dvh); }
  .focus-dialog[data-concept="zwischenraum"] .focus-glyph { width: min(96vw, 84dvh); height: min(96vw, 84dvh); }
  .focus-guide-controls { bottom: 18px; left: 20px; max-width: calc(100vw - 130px); }
  #focus-close { bottom: 18px; right: 20px; }
}
@media (max-width: 380px) {
  .shell { padding: 0 16px; }
  nav { gap: 10px; }
  .concept-picker button { font-size: 12px; }
  .examples-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stage-heading { flex-wrap: wrap; gap: 0; }
  .time-input-wrap { gap: 10px; }
  .time-controls, .cycle-controls, .accessibility-actions { align-items: stretch; }
  .guide-options { width: 100%; align-items: flex-start; flex-direction: column; gap: 2px; }
  .stage-heading .guide-options { width: auto; flex: 1 1 190px; }
  .focus-guide-controls { right: 18px; bottom: 72px; left: 18px; width: auto; max-width: none; }
  .focus-guide-controls .guide-option { width: 100%; }
  .answer-row input, .answer-row button { width: 100%; }
  .receipt-code-row { grid-template-columns: 1fr; }
  .result-stats { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
  .focus-dialog.controls-hidden #focus-close, .focus-dialog.controls-hidden .focus-guide-controls { opacity: 1; pointer-events: auto; }
}
@media (forced-colors: active) {
  .inactive-slots { stroke: CanvasText; opacity: 1; }
  :root { --ink: CanvasText; --paper: Canvas; --stage: Canvas; --muted: CanvasText; --line: CanvasText; --control-line: ButtonText; }
  .concept-picker button[aria-pressed="true"], .primary-button { background: Highlight; color: HighlightText; border: 2px solid Highlight; }
  .stage, .comparison-figure, .example-image { outline: 1px solid CanvasText; }
  .glyph svg, .example-image svg { forced-color-adjust: none; color: CanvasText; }
  .concept-picker button[aria-pressed="true"] { text-decoration: underline; }
}
@media print {
  .site-header nav, .mobile-menu-toggle, .time-controls, .control-note, #focus-open, .test-setup, .site-footer a, .theme-toggle { display: none; }
  .shell { padding: 0; }
  .intro { padding: 25px 0; }
  h1 { font-size: 46px; }
  .section { padding-top: 40px; }
  .stage { min-height: 350px; }
  .main-clock { height: 250px; }
  .main-clock .glyph { width: 240px; height: 240px; }
  .examples-grid { grid-template-columns: repeat(6, 1fr); }
  .comparison-grid { grid-template-columns: repeat(3, 1fr); }
  article, .stage, .example-button { break-inside: avoid; }
}

#consent-choice { margin: 0 0 24px; }

.language-picker a { min-width: 44px; justify-content: center; }