:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  color: var(--text);
  background: var(--page);
  --page: #f5f6f8;
  --surface: #ffffff;
  --on-accent: #ffffff;
  --heading: #182c49;
  --text: #304158;
  --muted: #596779;
  --blue: #245bbb;
  --blue-hover: #194895;
  --blue-tint: #eef3fc;
  --line: #dce1e8;
  --control-border: #8290a3;
  --logo-frame-border: #aab3c0;
  --logo-frame-shadow: #182c4924;
  --success: #276347;
  --success-tint: #f0f7f2;
  --retry: #79551a;
  --retry-tint: #fcf7ec;
  --radius: 8px;
  --panel-radius: 12px;
  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --body-size: 1rem;
  --small-size: .875rem;
  --title-size: clamp(1.8rem, 5vw, 2.5rem);
}

@font-face {
  font-family: "Material Symbols Outlined";
  src: url("./assets/material-symbols-grownups.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: block;
}

* { box-sizing: border-box; }
body { margin: 0; font-size: var(--body-size); line-height: 1.6; overflow-wrap: anywhere; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
  box-shadow: 0 0 0 4px var(--surface);
}
a { color: var(--blue); text-underline-offset: 4px; }
.skip-link { position: fixed; left: 1rem; top: -6rem; z-index: 10; padding: .75rem 1rem; background: var(--surface); }
.skip-link:focus { top: 1rem; }
#app:focus { outline: none; }
h1, h2, h3 { color: var(--heading); line-height: 1.25; }
h1 { margin: 0 0 var(--space-4); font-size: var(--title-size); font-weight: 700; letter-spacing: -.035em; text-wrap: balance; }
h2 { font-size: 1.25rem; letter-spacing: -.015em; }
p { margin: 0 0 var(--space-3); }

/* A shared frame, with a narrower reading width for the activity. */
.shell { width: min(100% - 2rem, 680px); min-height: 100vh; min-height: 100svh; margin: auto; display: flex; flex-direction: column; padding: var(--space-4) 0; }
.shell-wide { width: min(100% - 2rem, 1040px); }
.brand { display: flex; align-items: center; gap: var(--space-4); border-bottom: 1px solid var(--line); padding-bottom: var(--space-4); margin-bottom: var(--space-5); }
.brand .wordmark { display: flex; flex-direction: column; justify-content: center; min-height: 44px; color: var(--heading); font-size: 1rem; font-weight: 700; line-height: 1.35; letter-spacing: -.02em; text-decoration: none; }
.brand .wordmark span { color: var(--muted); font-size: var(--small-size); font-weight: 500; letter-spacing: 0; }
.brand-tag { color: var(--muted); font-size: var(--small-size); }
.header-challenge-action { display: inline-flex; align-items: center; min-height: 44px; margin-left: auto; border: 1px solid var(--blue); border-radius: var(--radius); padding: .5rem .75rem; color: var(--on-accent); background: var(--blue); font-weight: 600; line-height: 1.25; text-decoration: none; white-space: nowrap; }
.game-toolbar { min-height: 68px; margin-bottom: var(--space-4); padding: var(--space-2) var(--space-3); border: 0; border-radius: var(--radius); color: var(--surface); background: var(--heading); }
.toolbar-home { display: inline-flex; align-items: center; min-height: 44px; color: var(--surface); font-weight: 600; }
.toolbar-title { color: var(--surface); font-weight: 700; white-space: nowrap; }
.game-status { display: flex; flex-direction: column; margin-left: auto; color: #dbe5f4; font-size: var(--small-size); line-height: 1.35; text-align: right; }
.game-status strong { color: var(--surface); }
.toolbar-button { min-width: 44px; min-height: 44px; border: 1px solid #ffffff73; border-radius: var(--radius); padding: .5rem .7rem; color: var(--surface); background: transparent; font-weight: 600; cursor: pointer; }
.game-toolbar .toolbar-button:focus-visible, .game-toolbar .toolbar-home:focus-visible { outline-color: var(--surface); box-shadow: 0 0 0 4px var(--heading); }
.inline-action { display: inline-flex; align-items: center; text-decoration: none; }
.card { padding: clamp(1.25rem, 4vw, 2.5rem); border: 1px solid var(--line); border-radius: var(--panel-radius); background: var(--surface); box-shadow: 0 2px 4px #182c4903; }
.kicker, .mission { margin: 0 0 var(--space-2); color: var(--blue); font-size: var(--small-size); font-weight: 600; }
.lede { max-width: 40rem; margin-bottom: var(--space-4); font-size: 1.125rem; color: var(--muted); }
.site-footer { margin-top: auto; padding-top: var(--space-6); color: var(--muted); font-size: var(--small-size); }
.site-footer-public { margin-top: var(--space-6); border-top: 1px solid var(--line); padding-top: var(--space-4); }
.site-footer-statement { max-width: 44rem; margin-bottom: var(--space-2); }
.site-footer-nav { display: flex; flex-wrap: wrap; gap: 0 var(--space-3); }
.site-footer-nav a { display: inline-flex; align-items: center; min-height: 44px; color: var(--heading); font-weight: 600; }
.site-footer-nav a[aria-current="page"] { color: var(--blue); text-decoration-thickness: 2px; }
.site-footer-closing { margin: var(--space-2) 0 0; }
.site-footer-activity { padding-top: var(--space-5); text-align: center; }

/* Controls share dimensions and predictable, stationary interaction states. */
.button, .answer { min-height: 52px; border: 1px solid var(--control-border); border-radius: var(--radius); padding: .8rem 1rem; color: var(--heading); background: var(--surface); font-weight: 600; line-height: 1.5; cursor: pointer; transition: background-color .15s, border-color .15s; }
.button-primary { color: var(--on-accent); border-color: var(--blue); background: var(--blue); }
.button-secondary { color: var(--blue); border-color: var(--blue); background: var(--surface); }
.text-button { display: inline-flex; align-items: center; min-width: 44px; min-height: 44px; border: 0; padding: .5rem .25rem; color: var(--blue); background: transparent; font-weight: 600; cursor: pointer; text-align: left; }
.card > .text-button:first-child { margin: -.5rem 0 var(--space-4) -.25rem; }
.return-link { display: flex; width: fit-content; margin-top: var(--space-2); }
@media (hover: hover) {
  .button:hover, .answer:hover { border-color: var(--blue); background: var(--blue-tint); }
  .button-primary:hover, .kid-choice:hover, .header-challenge-action:hover { border-color: var(--blue-hover); background: var(--blue-hover); }
  .text-button:hover, .sponsor a:hover { text-decoration: underline; }
}
.button:active, .answer:active { border-color: var(--blue); }

/* Welcome: the headline and audience choices carry the page. */
.hero { display: grid; align-items: center; gap: var(--space-4); padding: var(--space-5) 0; }
.hero-copy { min-width: 0; }
.hero-dictionary { display: block; width: min(100%, 240px); height: auto; max-height: 140px; object-fit: contain; justify-self: center; }
.hero h1 { max-width: 12ch; font-size: clamp(2.5rem, 6vw, 4rem); line-height: 1.08; letter-spacing: -.045em; }
.hero .lede { margin-bottom: 0; }
.audience-choices { display: grid; gap: var(--space-3); }
.audience-choice { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-4); text-align: left; }
.audience-choice > span:first-child { min-width: 0; }
.audience-choice strong { display: block; margin-bottom: .4rem; font-size: 1.375rem; letter-spacing: -.02em; }
.audience-choice span span { display: block; font-weight: 400; }
.kid-choice { color: var(--on-accent); background: var(--blue); border-color: var(--blue); }
.choice-arrow { flex-shrink: 0; font-size: 1.5rem; font-weight: 400; }
.welcome-note { margin: var(--space-3) 0 var(--space-6); color: var(--muted); font-size: var(--small-size); }

/* The physical-book instruction remains distinct from the question. */
.feature-list { display: grid; gap: var(--space-3); padding-left: 1.5rem; margin: var(--space-4) 0; }
.feature-list li { padding-left: var(--space-1); }
.feature-list li::marker { color: var(--blue); font-weight: 600; }
.note, .next-challenge { margin: var(--space-4) 0; padding: var(--space-3); border-left: 3px solid var(--control-border); background: var(--page); color: var(--text); }
.progress-copy { color: var(--muted); font-size: var(--small-size); font-weight: 500; }
.progress-track { height: 4px; margin: var(--space-2) 0 var(--space-4); overflow: hidden; border-radius: var(--radius); background: var(--line); }
.progress-track span { display: block; height: 100%; background: var(--blue); }
.find-prompt { margin: 0 0 var(--space-4); padding: var(--space-3); border-left: 3px solid var(--blue); background: var(--blue-tint); color: var(--heading); font-weight: 500; }
.challenge h1 { font-size: clamp(1.375rem, 4vw, 1.75rem); line-height: 1.35; letter-spacing: -.02em; text-wrap: pretty; }
.answers { display: grid; gap: var(--space-2); }
.answer { display: flex; align-items: baseline; gap: var(--space-2); text-align: left; font-weight: 500; }
.answer-marker { flex: 0 0 1rem; width: 1rem; height: 1rem; border: 1.5px solid var(--control-border); border-radius: 50%; position: relative; top: .1rem; }
.answer.selected { border-color: var(--blue); background: var(--blue-tint); color: var(--heading); }
.answer.selected .answer-marker { border: 5px solid var(--blue); }
.answers[inert] .answer { cursor: default; }
.feedback { margin-top: var(--space-4); padding: var(--space-3); border: 1px solid; border-radius: var(--radius); }
.feedback h2 { margin: 0; font-size: 1.125rem; line-height: 1.5; }
.feedback p { margin: var(--space-2) 0 0; }
.feedback .button { margin-top: var(--space-3); }
.success { border-color: var(--success); background: var(--success-tint); }
.success h2 { color: var(--success); }
.retry { border-color: var(--retry); background: var(--retry-tint); }
.retry h2 { color: var(--retry); }

/* Sponsor and adult information use the same quiet section hierarchy. */
.adult-grid { display: grid; gap: var(--space-4); margin: var(--space-5) 0; }
.adult-grid article { border-top: 1px solid var(--line); padding-top: var(--space-3); }
.adult-grid h2 { margin: 0 0 var(--space-2); }
.adult-grid p { margin: 0; }
.adult > p { max-width: 44rem; }
.adult-section { max-width: 52rem; margin-top: var(--space-6); }
.adult-section > h2 { margin: 0 0 var(--space-3); font-size: 1.5rem; }
.redemption-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); margin: var(--space-4) 0; }
.redemption-location { min-width: 0; padding: var(--space-4); border: 1px solid var(--line); border-radius: var(--radius); background: var(--page); overflow-wrap: anywhere; }
.redemption-location h2 { margin: 0 0 var(--space-2); font-size: 1.25rem; }
.redemption-location address, .organizer-contact { margin-bottom: var(--space-3); font-style: normal; }
.redemption-location p:last-child { margin-bottom: 0; }
.participant-library { display: flex; flex-direction: column; gap: var(--space-3); }
.participant-library-link { margin: 0 0 var(--space-1); }
.participant-library-link a { font-weight: 600; }
.participant-subheading { margin: 0; color: var(--muted); font-size: .8rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.participant-location { padding-top: var(--space-3); border-top: 1px solid var(--line); }
.participant-location h4 { margin: 0 0 var(--space-1); color: var(--heading); font-size: 1rem; }
.participant-location address { margin: 0 0 var(--space-2); }
.participant-location p { margin: 0 0 var(--space-2); }
.participant-location p:last-child { margin-bottom: 0; }
.participant-logo-frame { display: grid; place-items: center; height: 96px; margin-bottom: var(--space-1); border-radius: var(--radius); padding: var(--space-2); color-scheme: only light; background: #fff; }
.participant-library:first-of-type .participant-logo-frame { background: #347ab7; }
.participant-logo { display: block; width: 200px; max-width: 100%; height: 80px; object-fit: contain; }
.participant-library.placeholder { visibility: hidden; }
.participant-logo-placeholder { border: 1px dashed var(--line); background: var(--surface); }
.placeholder-location { border-top: 1px dashed var(--line); }
.redemption-deadline { width: fit-content; padding: var(--space-2) var(--space-3); border-left: 4px solid var(--retry); background: var(--retry-tint); color: var(--heading); }
.redemption-availability { width: fit-content; margin: var(--space-4) 0; padding: var(--space-3) var(--space-4); border: 2px solid var(--blue); border-radius: var(--radius); background: var(--blue-tint); color: var(--heading); }
.redemption-availability p { margin: 0; }
.redemption-availability p + p { margin-top: var(--space-2); }
.benefit-list { display: grid; gap: var(--space-3); padding: 0; list-style: none; }
.benefit-list li { padding: var(--space-3); border: 1px solid var(--line); border-radius: var(--radius); background: var(--page); }
.benefit-list strong { display: block; margin-bottom: var(--space-1); color: var(--heading); }
.benefit-icon { display: block; width: fit-content; margin-bottom: var(--space-2); color: var(--blue); font-family: "Material Symbols Outlined"; font-size: 2rem; font-weight: 400; font-style: normal; line-height: 1; letter-spacing: normal; text-transform: none; white-space: nowrap; word-wrap: normal; direction: ltr; font-feature-settings: "liga"; }
.closing-invitation { margin: var(--space-5) 0; color: var(--heading); font-size: 1.25rem; font-weight: 600; }
.sponsors { margin: var(--space-5) 0; padding-top: var(--space-4); border-top: 1px solid var(--line); }
.sponsors > h2 { margin: 0 0 var(--space-4); color: var(--muted); font-size: var(--small-size); font-weight: 600; }
.sponsor-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: var(--space-5); }
.sponsor { min-width: 0; overflow-wrap: anywhere; }
.sponsor-logo-frame { display: grid; place-items: center; width: 176px; max-width: 100%; height: 96px; margin-bottom: var(--space-3); border: 1px solid var(--logo-frame-border); border-radius: var(--radius); padding: var(--space-1); color-scheme: only light; background: #fff; box-shadow: 0 1px 3px var(--logo-frame-shadow); }
.sponsor-logo { display: block; width: 160px; max-width: 100%; height: 80px; object-fit: contain; object-position: center; }
.sponsor-letter { display: grid; place-items: center; width: 44px; height: 44px; margin-bottom: var(--space-3); border: 1px solid var(--line); border-radius: var(--radius); color: var(--heading); background: var(--surface); font-size: 1.25rem; font-weight: 600; }
.sponsor h3 { margin: 0 0 var(--space-1); font-size: 1rem; }
.sponsor p { max-width: 40rem; margin: 0; color: var(--muted); }
.sponsor a { display: inline-flex; align-items: center; gap: .3rem; min-height: 44px; font-size: var(--small-size); font-weight: 600; }
.adult .sponsor { display: flex; flex-direction: column; padding: var(--space-4); border: 1px solid var(--line); border-radius: var(--radius); background: var(--page); }
.adult .sponsor a { width: fit-content; margin-top: auto; padding-top: var(--space-3); }
.sponsors-compact { margin-top: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

@media (min-width: 700px) {
  .shell { padding-top: var(--space-5); }
  .shell-wide { width: min(100% - 4rem, 1040px); }
  .hero { grid-template-columns: 1.2fr 1fr; gap: var(--space-5); padding: var(--space-6) 0; }
  .hero-dictionary { width: 100%; max-height: 320px; }
  .audience-choices, .adult-grid { grid-template-columns: 1fr 1fr; }
  .benefit-list { grid-template-columns: repeat(2, 1fr); }
  .audience-choice { padding: var(--space-5); }
}
@media (min-width: 960px) {
  .benefit-list { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 799px) {
  .brand-tag { display: none; }
  .public-header { gap: var(--space-2); }
  .game-toolbar { gap: var(--space-2); }
  .toolbar-title { display: none; }
  .hero { padding-top: var(--space-3); }
  .card .button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}
@media (forced-colors: active) {
  .answer.selected .answer-marker { border-color: Highlight; }
  .progress-track { border: 1px solid CanvasText; }
  .progress-track span { background: Highlight; forced-color-adjust: none; }
}

/* Typed dictionary challenges and stage progression. */
input:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
#answer-form label { display: block; margin-bottom: var(--space-1); font-weight: 600; }
#typed-answer { display: block; width: 100%; min-height: 52px; margin-bottom: var(--space-2); border: 1px solid var(--control-border); border-radius: var(--radius); padding: .75rem; color: var(--heading); background: var(--surface); }
.quiz-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-4) 0; }
.challenge .quiz-actions { align-items: center; }
.previous-link { margin-left: var(--space-1); }
.level-list { display: grid; gap: var(--space-3); padding: 0; list-style: none; margin: var(--space-4) 0; }
.level-card { padding: var(--space-3); border: 1px solid var(--line); border-radius: var(--radius); }
.level-card h2 { margin: 0 0 var(--space-3); }
.review-list { padding-left: 1.5rem; }
.review-list li { padding: var(--space-3) 0; border-bottom: 1px solid var(--line); }
.review-list p { margin-bottom: var(--space-1); }
.result-review { margin-top: var(--space-5); }
.certificate { border: 3px double var(--blue); text-align: center; }
.certificate .lede { color: var(--blue); font-weight: 600; }
.certificate-score { font-size: 1.25rem; font-weight: 700; }
.certificate-redemption { margin: var(--space-4) auto 0; padding-top: var(--space-3); border-top: 1px solid var(--line); font-size: var(--small-size); }
.certificate-prize { font-weight: 700; }
.certificate-availability { margin: var(--space-5) auto 0; padding-top: var(--space-3); border-top: 1px solid var(--line); font-size: 0.8rem; line-height: 1.4; }
.certificate-availability strong { margin-right: 0.2em; }
.certificate-sponsors { margin-top: var(--space-5); padding-top: var(--space-4); border-top: 1px solid var(--line); }
.certificate-sponsors h2 { margin: 0 0 var(--space-3); color: var(--muted); font-size: var(--small-size); font-weight: 600; }
.certificate-sponsor-grid { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: center; gap: var(--space-4) var(--space-5); }
.certificate-sponsor { display: grid; justify-items: center; max-width: 180px; color: var(--heading); font-size: var(--small-size); line-height: 1.35; }
.certificate-sponsor .sponsor-logo-frame { margin-bottom: var(--space-2); }
.certificate-sponsor .sponsor-letter { margin-bottom: var(--space-2); }
.completion-code { display: inline-block; margin: var(--space-2) 0; color: var(--heading); font-family: ui-monospace, monospace; font-size: clamp(1rem, 4vw, 1.4rem); letter-spacing: .04em; }
@media (max-width: 499px) {
  .quiz-actions > .button { width: 100%; }
  .challenge .quiz-actions { flex-direction: column; align-items: stretch; }
  .challenge .previous-link { order: 2; margin: 0; }
}
@media (max-width: 360px) {
  .site-footer-nav { flex-direction: column; }
  .site-footer-nav a { width: 100%; }
}
@media print {
  @page { margin: 10mm; }
  body { color: #000; background: #fff; }
  .brand, .site-footer, .skip-link, .no-print { display: none !important; }
  .shell { display: block; width: 100%; min-height: 0; padding: 0; }
  .certificate { break-inside: avoid; box-shadow: none; border-color: #000; padding: 8mm; }
  .certificate h1 { margin-bottom: 10pt; font-size: 22pt; }
  .certificate p, .certificate strong, .certificate .lede { color: #000; }
  .certificate p { margin-bottom: 8pt; line-height: 1.35; }
  .certificate-redemption { margin-top: 8pt; padding-top: 6pt; border-color: #777; }
  .certificate-sponsors { margin-top: 10pt; padding-top: 8pt; }
  .certificate-sponsors h2 { margin-bottom: 6pt; }
  .certificate-sponsor-grid { gap: 8pt 14pt; }
  .certificate-availability { margin-top: 8pt; padding-top: 6pt; }
  .certificate-availability { display: block !important; border-color: #777; color: #000; font-size: 9pt; line-height: 1.35; }
  .redemption-grid { grid-template-columns: repeat(2, 1fr); }
  .redemption-location { break-inside: avoid; border-color: #777; background: #fff; }
}

/* Answer and teaching components use native controls, with touch-sized labels. */
.quiz-icon { flex: 0 0 1.4rem; width: 1.4rem; height: 1.4rem; vertical-align: middle; }
.find-prompt { display: flex; align-items: flex-start; gap: .6rem; }
.find-prompt .quiz-icon { margin-top: .15rem; }
.answer-label { color: var(--heading); font-weight: 600; }
.answer-label .quiz-icon { margin-right: .35rem; }
#answer-form .answer-label { margin-bottom: var(--space-2); }
.choice-input { min-width: 0; border: 0; padding: 0; margin: 0; }
.choice-options { display: grid; gap: var(--space-2); margin-bottom: var(--space-2); }
#answer-form .choice-option { display: flex; align-items: center; gap: .75rem; min-height: 52px; margin: 0; padding: .75rem; border: 1px solid var(--control-border); border-radius: var(--radius); cursor: pointer; font-weight: 500; }
.choice-option input { flex: 0 0 1.2rem; width: 1.2rem; height: 1.2rem; margin: 0; accent-color: var(--blue); }
.choice-option:has(input:checked) { border-color: var(--blue); background: var(--blue-tint); }
.choice-option:has(input:focus-visible) { outline: 3px solid var(--blue); outline-offset: 3px; }
.choice-binary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.challenge h1 { margin-bottom: var(--space-3); }
.challenge .find-prompt { margin-bottom: var(--space-2); padding: var(--space-2); }
.challenge #answer-help { margin-bottom: 0; }
.dictionary-tip { margin: 0 0 var(--space-4); border: 1px solid var(--line); border-radius: var(--radius); }
.challenge .dictionary-tip { margin-bottom: var(--space-3); }
summary { min-height: 44px; padding: .65rem .75rem; cursor: pointer; color: var(--blue); font-weight: 600; }
summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
summary .quiz-icon { margin-right: .25rem; }
.dictionary-tip p, .discovery-activity details p { padding: 0 var(--space-3) var(--space-2); margin: 0; }
.guide-example { margin: 0 0 var(--space-3); padding: var(--space-3); border: 1px solid var(--line); border-radius: var(--radius); background: var(--page); }
.guide-words { display: flex; justify-content: space-between; gap: 1rem; color: var(--heading); font-weight: 700; }
.guide-words span:last-child { text-align: right; }
.guide-words small { display: block; font-weight: 400; font-size: .75rem; color: var(--muted); }
.guide-example svg { width: 100%; height: 30px; color: var(--line); margin-top: .75rem; }
.guide-example figcaption { font-size: .75rem; color: var(--muted); }
.learning-review { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-top: var(--space-4); }
.learning-review .review-list { margin-right: var(--space-3); }
.discovery-activity { margin-top: var(--space-4); padding: var(--space-3); background: var(--blue-tint); border-radius: var(--radius); }
.discovery-activity h2 { margin-top: 0; }