.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.tour-shortcuts{display:flex;flex-wrap:wrap;gap:.6rem;margin:2rem 0}
.tour-shortcuts .button{font-size:.9rem;margin:0}
.tour{scroll-margin-top:2rem}
.tour-stops{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.tour-stops li{background:var(--panel);border:1px solid var(--line);border-radius:1rem}
.tour-stops a{display:flex;flex-direction:column;gap:.8rem;padding:1.5rem;height:100%}
.tour-stops strong{font-size:1.2rem}
.tour-stops .text-link{margin-top:auto}
.tour-stops a:hover{background:var(--line);border-radius:1rem}
.tour-stops a:focus-visible,.tour-shortcuts a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.article .fact h2{font-size:1.6rem;margin-top:0}
.quiz-question fieldset{margin:0;padding:0;border:0;min-width:0}
.quiz-question h2{margin-top:0;font-size:clamp(1.4rem,4vw,2rem);line-height:1.18}
.experiment .quiz-choice{display:flex;align-items:baseline;gap:.7rem;padding:.85rem;background:var(--bg);border:1px solid var(--line);border-radius:.7rem;font-weight:500;cursor:pointer;margin:.6rem 0}
.quiz-choice input{accent-color:var(--accent);flex-shrink:0}
.quiz-question button{margin-top:.6rem}
.quiz-question fieldset:disabled .quiz-choice{cursor:default}
.quiz-question [data-explanation]{border-top:1px solid var(--line);padding-top:1rem}
.quiz-feedback{font-weight:700;color:var(--accent)}
.quiz-progress{font-weight:700;border-bottom:1px solid var(--line);padding:1rem 0}
[hidden]{display:none!important}
.journey-nav{display:flex;flex-direction:column;gap:.7rem;margin:3rem 0;padding:1.3rem;border:1px solid var(--line);border-radius:1rem;background:var(--panel);font-size:1rem;color:var(--ink)}
.journey-nav p{margin:0}
.journey-nav a{text-decoration:underline;text-underline-offset:.2em}
.journey-nav .journey-links{display:flex;flex-wrap:wrap;gap:.7rem 1.4rem}
.new-discoveries h3{font-size:1.5rem;line-height:1.12}
.new-discoveries .topic-card{display:flex;flex-direction:column}
.new-discoveries .topic-card a{margin-top:auto}
@media(max-width:600px){.tour-stops{grid-template-columns:1fr}.tour-shortcuts{display:flex}.quiz-choice span{overflow-wrap:anywhere}}