*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 1.5rem; }
body { margin: 0; min-width: 0; }
[hidden] { display: none !important; }
.proof-page { --gutter: clamp(20px, 4.4vw, 72px); }
.proof-mast, .proof-footer, .proof-main { width: min(100%, 1520px); margin-inline: auto; }
.proof-mast { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 94px; padding: 20px var(--gutter); }
.proof-mast p { margin: 0; }
.proof-mast p:last-child { text-align: right; }
.proof-main { padding: 0 var(--gutter) 64px; }
.proof-skip { position: absolute; top: 12px; left: var(--gutter); z-index: 10; padding: 12px 20px; transform: translateY(-160%); }
.proof-skip:focus { transform: none; }
.proof-intro { display: grid; grid-template-columns: minmax(0, 2fr) minmax(240px, 1fr); gap: 40px; align-items: end; padding: 52px 0 58px; }
.proof-intro h1 { max-width: 18ch; margin: 12px 0 0; }
.proof-intro p { max-width: 54ch; }
.proof-intro > p { margin-bottom: 8px; }
.proof-chapter { padding: clamp(26px, 4.4vw, 58px); margin-block: 0 28px; }
.proof-chapter > h2 { max-width: 27ch; margin-top: 0; }
.proof-chapter p, .proof-chapter li { max-width: 70ch; }
.proof-chapter p { margin-block: 12px; }
.proof-notes { margin-top: 30px; padding-top: 18px; }
.proof-notes > p { margin: 0 0 8px; }
.proof-notes ul { display: flex; flex-wrap: wrap; gap: 8px 18px; padding: 0; margin: 0; list-style: none; }
.proof-notes a { display: inline-flex; align-items: center; min-height: 48px; padding: 5px 0; }
.proof-next { display: inline-flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 54px; padding: 13px 20px; margin-top: 16px; max-width: 100%; }
.proof-next::after { content: '+'; flex: none; }
.proof-footer { padding: 36px var(--gutter) 46px; }
.proof-footer nav { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.proof-footer a { display: inline-flex; align-items: center; min-height: 48px; padding: 9px 0; }
.proof-footer p { max-width: 70ch; margin: 25px 0 0; }
.proof-duo { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.proof-duo > * { min-width: 0; }
.proof-prompt { margin-block: 22px; padding: 24px; }
.proof-prompt h3 { margin: 0 0 8px; }
.proof-questions { padding-left: 24px; }
.proof-questions li { padding: 8px 0 8px 6px; }
@media (max-width: 760px) {
  .proof-mast { min-height: 78px; gap: 16px; }
  .proof-mast p:last-child { max-width: 12ch; }
  .proof-intro { grid-template-columns: 1fr; gap: 20px; padding-block: 28px 34px; }
  .proof-intro h1 { max-width: 19ch; }
  .proof-duo { grid-template-columns: 1fr; gap: 22px; }
  .proof-chapter { margin-bottom: 20px; }
  .proof-notes ul { display: block; }
  .proof-notes a { padding-block: 10px; }
  .proof-main { padding-bottom: 34px; }
  .proof-next { width: 100%; }
  .proof-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; }
}


.proof-forms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; margin-top: 40px; }
.proof-form { min-width: 0; }
.proof-form h3 { margin: 24px 0 18px; }
.proof-form-word { width: 112px; height: 112px; display: grid; place-items: center; margin: 0 !important; }
.proof-duo { gap: 28px; }
.proof-duo .proof-notes ul { display: block; }
@media (max-width: 760px) {
  .proof-forms { grid-template-columns: 1fr; gap: 36px; }
  .proof-form { padding-bottom: 22px; }
  .proof-form-word { width: 92px; height: 92px; }
}