:root {
  --paper: #f6f2e9;
  --sheet: #fffcf5;
  --ink: #202b24;
  --muted: #62665b;
  --mustard: #d6a43b;
  --mustard-hover: #e5b54e;
  --forest: #243e34;
  --on-forest: #d9e1d7;
  --rule: #d5cebf;
  --control-border: #878b7c;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
button, input, textarea { font: inherit; }
button, a, input, textarea, summary { -webkit-tap-highlight-color: transparent; }
button, input, textarea { color: inherit; }
a { color: inherit; text-decoration: none; }
button, summary, label:has(input[type="checkbox"]), .answer-option { cursor: pointer; }
button { border: 0; }
svg { display: block; flex-shrink: 0; }
p { margin: 0; line-height: 1.7; }
h1, h2, h3 { margin: 0; font-weight: 400; }
h1, h2 { font-family: var(--serif); }
h2 { font-size: clamp(36px, 4.3vw, 54px); line-height: 1.08; letter-spacing: -1.5px; }
em { font-weight: 400; }
sup { font-size: .66em; line-height: 0; }
::selection { background: var(--mustard); color: var(--ink); }
:focus-visible { outline: 2px solid currentColor; outline-offset: 5px; }
[tabindex="-1"]:focus { outline: none; }
[id] { scroll-margin-top: 96px; }
.page-width { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.section-space { margin-top: 64px; }
.visually-hidden {
  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;
  z-index: 50;
  top: 8px;
  left: 20px;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  background: var(--ink);
  color: var(--sheet);
}
.skip-link:focus { width: auto; height: auto; padding: 14px 20px; overflow: visible; clip-path: none; }

/* A persistent invitation while students explore the page. */
.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 12px; }
.brand { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-family: var(--serif); font-size: 27px; font-weight: 700; letter-spacing: -1.2px; }
.brand-symbol, .brand-period { color: var(--mustard); }
.brand-period { margin-left: 1px; }
nav { display: flex; align-items: center; gap: 30px; }
.nav-link { display: none; min-height: 44px; align-items: center; font-size: 14px; }
.nav-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  min-height: 50px;
  border: 1px solid transparent;
  border-radius: 3px;
  padding: 13px 22px;
  font-size: 14px;
  line-height: 1.45;
  font-weight: 600;
  text-align: center;
  transition: background-color 160ms ease;
}
.button-small { min-height: 44px; padding: 10px 13px; font-size: 12px; gap: 12px; }
.button-ink { background: var(--ink); color: var(--sheet); }
.button-ink:hover { background: var(--forest); }
.button-mustard { background: var(--mustard); color: var(--ink); }
.button-mustard:hover { background: var(--mustard-hover); }
.button:disabled { opacity: .65; cursor: wait; }
.button:focus-visible { outline-color: var(--ink); }
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  background: transparent;
  padding: 0;
  font-size: 14px;
  line-height: 1.4;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--control-border);
  text-underline-offset: 5px;
}
.text-link:hover { text-decoration-color: currentColor; }
.eyebrow { display: flex; align-items: center; gap: 9px; font-size: 11px; line-height: 1.7; font-weight: 600; letter-spacing: 1.4px; text-transform: uppercase; }
.status-dot { height: 7px; width: 7px; flex-shrink: 0; background: var(--mustard); border: 1px solid var(--ink); border-radius: 50%; }
.section-number { margin-right: 7px; font-weight: 400; font-variant-numeric: tabular-nums; }

/* The sample is the hero's visual, useful before the full product exists. */
.hero { display: grid; gap: 42px; padding-top: 38px; }
.hero-copy h1 { margin-top: 24px; font-size: clamp(54px, 8.3vw, 94px); line-height: 1.01; letter-spacing: -2.8px; }
.hero-copy h1 em { position: relative; display: inline-block; z-index: 0; }
.hero-copy h1 em::after { content: ""; position: absolute; z-index: -1; height: 8px; left: -3px; right: -3px; bottom: 3px; background: var(--mustard); transform: rotate(-2deg); }
.hero-lead { font-size: 18px; line-height: 1.5; margin-top: 24px; max-width: 400px; }
.hero-detail { margin-top: 14px; color: var(--muted); font-size: 15px; max-width: 410px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px; margin-top: 26px; }
.hero-footnote { display: flex; gap: 13px; align-items: center; margin-top: 30px; }
.hero-footnote svg { color: var(--mustard); }
.hero-footnote p { font-size: 12px; line-height: 1.6; color: var(--muted); }
.hero-footnote strong { color: var(--ink); font-weight: 500; }
.study-preview { min-width: 0; }
.preview-caption { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 12px; font-size: 11px; color: var(--muted); }
.preview-caption > :first-child { text-transform: uppercase; letter-spacing: 1.4px; font-weight: 600; }
.preview-caption > :last-child { font-family: var(--serif); font-size: 13px; font-style: italic; }
.question-paper { position: relative; border: 1px solid var(--rule); border-top: 3px solid var(--mustard); border-radius: 2px; padding: 23px 20px 20px; background: var(--sheet); box-shadow: 5px 5px 0 var(--paper), 6px 6px 0 var(--rule); }
.paper-topline { display: flex; justify-content: space-between; align-items: center; padding-bottom: 15px; border-bottom: 1px solid var(--rule); }
.paper-topline .eyebrow { font-size: 10px; }
.paper-index { color: var(--muted); font-size: 11px; }
.question-paper h2 { font-size: 33px; letter-spacing: -1px; margin-top: 20px; }
.sample-intro { color: var(--muted); font-size: 13px; line-height: 1.7; margin-top: 9px; }
.question-meta { margin-top: 25px; color: var(--muted); font-size: 11px; font-weight: 600; letter-spacing: .7px; text-transform: uppercase; }
.question-meta span { margin-inline: 7px; color: var(--control-border); }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
.question { width: 100%; margin: 14px 0 20px; padding: 0; font-family: var(--serif); font-size: 24px; line-height: 1.5; letter-spacing: -.4px; }
.question-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.answer-option { position: relative; min-width: 0; }
.answer-option input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.answer-content { display: flex; gap: 10px; align-items: center; min-height: 54px; padding: 10px; border: 1px solid var(--control-border); border-radius: 3px; font-size: 17px; }
.answer-letter { display: grid; place-items: center; width: 25px; height: 25px; border-right: 1px solid var(--rule); padding-right: 8px; font-family: var(--sans); font-size: 12px; color: var(--muted); }
.answer-option:hover .answer-content { border-color: var(--ink); }
.answer-option input:checked + .answer-content { background: #f3e3b9; border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.answer-option input:focus-visible + .answer-content { outline: 2px solid var(--ink); outline-offset: 3px; }
.answer-state { margin-left: auto; font-size: 10px; font-weight: 600; }
.answer-option.is-correct input + .answer-content { background: var(--forest); border-color: var(--forest); box-shadow: none; color: var(--sheet); }
.answer-option.is-correct .answer-letter { color: var(--sheet); border-color: #85988a; }
.answer-option.is-incorrect input + .answer-content { background: #efe6dc; border-style: dashed; box-shadow: none; }
.answer-option:has(input:disabled) { cursor: default; }
.question-actions { display: grid; gap: 12px; margin-top: 20px; }
.question-actions .button { width: 100%; }
.question-actions > span { text-align: center; color: var(--muted); font-size: 11px; }
.sample-disclaimer { border-top: 1px solid var(--rule); margin-top: 22px; padding-top: 13px; color: var(--muted); font-size: 11px; line-height: 1.65; }
.preview-note { margin-top: 22px; font-family: var(--serif); font-style: italic; font-size: 15px; color: var(--muted); text-align: center; }
.preview-note span { color: var(--ink); white-space: nowrap; }
.explanation { margin-top: 23px; padding-top: 20px; border-top: 1px solid var(--rule); }
.verdict { color: var(--forest); font-size: 13px; font-weight: 600; margin-bottom: 9px; }
.explanation h3 { font-family: var(--serif); font-size: 26px; line-height: 1.2; letter-spacing: -.5px; }
.solution-steps { list-style: none; counter-reset: steps; margin: 20px 0 0; padding: 0; }
.solution-steps li { position: relative; counter-increment: steps; padding-left: 34px; margin-bottom: 17px; font-size: 13px; line-height: 1.75; }
.solution-steps li::before { content: "0" counter(steps); position: absolute; left: 0; top: 0; font-size: 11px; font-weight: 600; color: var(--muted); }
.solution-steps li > strong { display: block; font-weight: 600; }
.solution-steps li > span { color: var(--muted); }
.common-trap { padding: 13px 16px; background: #f3e3b9; border-left: 2px solid var(--mustard); font-size: 12px; line-height: 1.7; }
.common-trap strong { font-weight: 600; }
.answer-check { font-size: 12px; margin-top: 14px; color: var(--muted); }
.explanation .text-link { margin-top: 6px; font-size: 12px; }
.no-script-solution { margin-top: 22px; font-size: 14px; }
.no-script-solution p { margin-block: 12px; }
.no-script-solution summary { min-height: 44px; padding-block: 12px; }

/* Quiet rules and generous spacing, rather than floating feature cards. */
.features { border-top: 1px solid var(--rule); padding-top: 34px; }
.section-heading h2 { margin-top: 18px; }
.section-heading > p { color: var(--muted); font-size: 15px; max-width: 370px; margin-top: 22px; }
.feature-grid { display: grid; margin-top: 32px; }
.feature { padding: 24px 0; border-top: 1px solid var(--rule); }
.feature-mark { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.feature-mark svg { background: #ebdfc4; box-sizing: content-box; padding: 8px; border-radius: 50%; }
.feature-mark > span { font-family: var(--serif); font-size: 17px; font-style: italic; color: var(--muted); }
.feature h3 { font-family: var(--serif); font-size: 25px; letter-spacing: -.5px; }
.feature p { font-size: 14px; color: var(--muted); margin-top: 12px; max-width: 380px; }
.feature .feature-aside { color: var(--ink); font-family: var(--serif); font-size: 15px; font-style: italic; margin-top: 20px; }

/* Anonymous input stays visibly separate from the contact form. */
.struggles { background: var(--forest); color: var(--sheet); padding-block: 40px; }
.struggles-inner { display: grid; gap: 30px; }
.struggles .eyebrow { color: var(--on-forest); }
.struggles h2 { margin-top: 21px; }
.struggles-intro > p:not(.eyebrow) { color: var(--on-forest); font-size: 14px; max-width: 340px; margin-top: 19px; }
.struggles-intro > p.anonymous-note { font-size: 12px; margin-top: 24px; }
.anonymous-note span { color: var(--mustard); margin-right: 6px; font-size: 20px; }
.struggles legend { font-size: 13px; line-height: 1.7; margin-bottom: 14px; padding: 0; }
.topic-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; margin-bottom: 24px; }
.topic-choice { position: relative; min-width: 0; }
.topic-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.topic-choice span { display: flex; align-items: center; gap: 9px; min-height: 58px; height: 100%; padding: 10px; border: 1px solid #8a9b8d; border-radius: 3px; font-size: 12px; line-height: 1.45; }
.topic-choice span::before { content: "+"; font-size: 17px; font-weight: 400; line-height: 1; }
.topic-choice:hover span { border-color: var(--sheet); }
.topic-choice input:checked + span { background: var(--mustard); color: var(--ink); border-color: var(--mustard); }
.topic-choice input:checked + span::before { content: "✓"; font-size: 15px; }
.topic-choice input:focus-visible + span { outline: 2px solid var(--sheet); outline-offset: 3px; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.field label { font-size: 13px; line-height: 1.6; font-weight: 600; }
.optional { font-size: 11px; font-weight: 400; color: var(--muted); margin-left: 5px; white-space: nowrap; }
input:not([type="radio"]):not([type="checkbox"]), textarea {
  width: 100%;
  min-height: 50px;
  padding: 12px 14px;
  border: 1px solid var(--control-border);
  border-radius: 3px;
  background: var(--sheet);
  font-size: 16px;
  line-height: 1.5;
  box-shadow: none;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
textarea { resize: vertical; min-height: 96px; }
input:focus-visible, textarea:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.field-hint { font-size: 11px; color: var(--muted); line-height: 1.6; }
.struggles textarea { background: #2c473c; color: var(--sheet); border-color: #8a9b8d; }
.struggles textarea::placeholder { color: var(--on-forest); }
.struggles .optional, .struggles .field-hint { color: var(--on-forest); }
.struggles textarea:focus-visible, .struggles .button:focus-visible { outline-color: var(--sheet); }
.struggles .button { width: 100%; }
.form-message { margin-top: 14px; padding-left: 12px; border-left: 2px solid currentColor; font-size: 13px; line-height: 1.7; }
.form-message:empty { display: none; }
.struggle-thanks { padding-top: 4px; }
.confirmation-mark { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid currentColor; border-radius: 50%; font-size: 22px; margin-bottom: 24px; }
.struggle-thanks h3, .success h3 { font-family: var(--serif); font-size: 34px; line-height: 1.15; letter-spacing: -.8px; }
.struggle-thanks p { font-size: 14px; color: var(--on-forest); margin-top: 16px; }
.struggle-thanks .text-link { margin-top: 15px; text-decoration-color: var(--on-forest); }

/* An open-book invitation: ochre cover, paper form. */
.join-panel { border: 1px solid var(--rule); border-radius: 3px; overflow: hidden; }
.join-intro { position: relative; padding: 30px 24px; background: var(--mustard); }
.join-flower { width: 65px; height: 65px; margin-block: 28px; }
.join-intro h2 { font-size: clamp(39px, 4.4vw, 56px); letter-spacing: -1.8px; }
.join-intro > p:not(.eyebrow) { font-size: 14px; margin-top: 24px; max-width: 330px; }
.join-intro > p.launch-note { border-top: 1px solid #a27627; padding-top: 18px; font-size: 12px; }
.signup { background: var(--sheet); padding: 30px 24px; }
.form-heading { margin-bottom: 26px; }
.form-heading h3 { font-family: var(--serif); font-size: 34px; line-height: 1.2; letter-spacing: -1px; }
.form-heading p { margin-top: 9px; font-size: 13px; color: var(--muted); }
.optional-feedback { border-block: 1px solid var(--rule); margin-bottom: 16px; }
.optional-feedback summary { padding-block: 14px; min-height: 48px; font-size: 12px; line-height: 1.65; }
.optional-feedback .field { margin-top: 7px; }
.consent { display: flex; align-items: flex-start; gap: 10px; padding-block: 9px; min-height: 44px; margin-bottom: 16px; font-size: 12px; line-height: 1.7; color: var(--muted); }
.consent input { flex-shrink: 0; width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--ink); }
.submit { width: 100%; }
.privacy-note { font-size: 11px; text-align: center; margin-top: 14px; color: var(--muted); }
.success { padding-block: 24px; }
.success p { margin-top: 19px; font-size: 15px; color: var(--muted); }
.success .text-link { margin-top: 20px; }
.noscript-note { margin-block: 30px; font-size: 14px; }

.site-footer { margin-top: 48px; padding-block: 25px; border-top: 1px solid var(--rule); }
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 18px; }
.footer-brand { gap: 0; font-size: 28px; }
.footer-top > p { order: 1; flex-basis: 100%; font-family: var(--serif); font-size: 15px; font-style: italic; color: var(--muted); }
.footer-top .text-link { font-size: 12px; }
.footer-bottom { display: flex; flex-direction: column; gap: 7px; border-top: 1px solid var(--rule); padding-top: 20px; margin-top: 22px; color: var(--muted); font-size: 11px; line-height: 1.7; }

@media (min-width: 480px) {
  .page-width { width: min(1160px, calc(100% - 64px)); }
  .button-small { font-size: 13px; padding-inline: 18px; }
  .question-paper { padding: 28px; }
  .answer-content { padding: 12px 16px; }
  .answer-state { font-size: 11px; }
  .topic-choice span { font-size: 13px; padding-inline: 14px; }
  .join-intro, .signup { padding: 38px; }
}

@media (min-width: 760px) {
  .header-inner { min-height: 82px; }
  .brand { font-size: 30px; }
  .nav-link { display: inline-flex; }
  .hero { grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; padding-top: 64px; }
  .hero-copy { padding-top: 26px; }
  .hero-copy h1 { font-size: clamp(58px, 7.2vw, 94px); }
  .hero .eyebrow { max-width: 320px; }
  .hero-actions { gap: 12px 18px; }
  .question-paper { padding: 26px 23px 22px; }
  .question-paper h2 { font-size: 33px; }
  .answer-content { padding-inline: 11px; gap: 8px; }
  .section-space { margin-top: 90px; }
  .features { padding-top: 44px; }
  .section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; }
  .section-heading > p { max-width: 320px; margin: 0; }
  .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 40px; }
  .feature { padding-top: 26px; padding-bottom: 0; }
  .feature h3 { font-size: 23px; }
  .feature p { font-size: 13px; }
  .struggles { padding-block: 54px; }
  .struggles-inner { grid-template-columns: .85fr 1.15fr; gap: 45px; }
  .struggles h2 { font-size: 43px; }
  .topic-grid { gap: 10px; }
  .topic-choice span { font-size: 12px; }
  .struggles .button { width: auto; }
  .join-panel { display: grid; grid-template-columns: .9fr 1.1fr; }
  .join-intro, .signup { padding: 36px 30px; }
  .join-flower { width: 84px; height: 84px; margin-top: 42px; margin-bottom: 34px; }
  .join-intro h2 { font-size: 46px; }
  .join-intro > p.launch-note { margin-top: 34px; }
  .site-footer { margin-top: 64px; }
  .footer-top > p { order: 0; flex-basis: auto; }
  .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1024px) {
  .hero { grid-template-columns: 1.05fr 1fr; gap: 76px; padding-top: 74px; }
  .hero-copy { padding-top: 36px; }
  .hero-copy h1 { font-size: clamp(78px, 7.7vw, 94px); margin-top: 29px; }
  .hero-lead { margin-top: 30px; font-size: 20px; }
  .hero-detail { font-size: 16px; }
  .hero-actions { margin-top: 30px; gap: 28px; }
  .hero-footnote { margin-top: 39px; }
  .question-paper { padding: 28px 32px 23px; }
  .question-paper h2 { font-size: 38px; }
  .question { font-size: 27px; }
  .answer-content { padding-inline: 14px; }
  .feature-grid { gap: 46px; margin-top: 46px; }
  .feature h3 { font-size: 27px; }
  .feature p { font-size: 14px; }
  .feature-mark { margin-bottom: 26px; }
  .section-heading > p { max-width: 365px; margin-right: 32px; }
  .section-space { margin-top: 106px; }
  .struggles { padding-block: 68px; }
  .struggles-inner { grid-template-columns: .9fr 1.1fr; gap: 90px; }
  .struggles h2 { font-size: 56px; }
  .struggles-intro > p:not(.eyebrow) { font-size: 15px; }
  .struggles-intro > p.anonymous-note { font-size: 12px; margin-top: 32px; }
  .topic-choice span { font-size: 13px; min-height: 54px; }
  .join-intro, .signup { padding: 44px 48px; }
  .join-intro h2 { font-size: 56px; }
  .join-intro > p:not(.eyebrow):not(.launch-note) { font-size: 15px; }
  .join-flower { margin-block: 36px; }
}

@media (max-width: 359px) {
  .header-inner .brand-symbol { display: none; }
  .answer-content { gap: 6px; padding-inline: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media (forced-colors: active) {
  .answer-option input:checked + .answer-content,
  .topic-choice input:checked + span { outline: 2px solid Highlight; outline-offset: -4px; }
  .answer-option.is-correct .answer-content { border: 3px double Highlight; }
  .button { border-color: ButtonText; }
}