.history-challenge [hidden]{display:none!important}
.history-challenge{--quiz-green:#315d43;--quiz-rust:#8f482c}
.challenge-intro{background:var(--indigo);color:var(--ivory);padding:clamp(3rem,6vw,5rem) 0 5.2rem}
.challenge-intro__inner{display:grid;gap:2.5rem;align-items:center}
.challenge-intro .section__kicker{color:#edc67f}
.challenge-intro h1{color:var(--ivory);font-size:clamp(2.7rem,5.4vw,5.3rem);line-height:1.02;letter-spacing:-.045em}
.challenge-intro__lead{font-size:1.03rem;line-height:1.75;max-width:36rem;color:#e2ded5;margin:1.5rem 0 1.2rem}
.challenge-intro__note{font-size:.75rem;color:#c1ccd2;margin:0}
.challenge-stamp{padding:2rem 1.4rem;border:1px solid #5f7685;box-shadow:inset 0 0 0 9px var(--indigo),inset 0 0 0 10px #5f7685;text-align:center;transform:rotate(3deg);max-width:21rem;width:100%;justify-self:center}
.challenge-stamp>span{display:block;font-size:.58rem;font-weight:700;letter-spacing:.14em;color:#f1d29c}
.challenge-stamp>strong{display:block;font-family:var(--serif);font-weight:600;font-size:7.2rem;line-height:1.2;color:var(--ivory)}
.challenge-stamp>div{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem 1rem;border-top:1px solid #5f7685;padding-top:1rem;margin-top:1.1rem;font-size:.69rem;color:#e2ded5}
.challenge-workspace{position:relative;display:grid;gap:2.5rem;align-items:start;margin-top:-2rem}
.challenge-card{min-width:0;border:1px solid var(--rule);border-radius:10px;padding:clamp(1.3rem,3.5vw,2.7rem);background:var(--paper);box-shadow:0 12px 35px #18324a0a}
.challenge-card h2{font-size:clamp(1.8rem,3vw,2.5rem);line-height:1.2;max-width:33ch;letter-spacing:-.028em}
.challenge-eyebrow{font-size:.67rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--quiz-rust);margin-bottom:.65rem}
.challenge-topics,.challenge-options{border:0;margin:1.8rem 0;padding:0;min-width:0}
.challenge-topics legend,.challenge-length label{display:block;font-size:.79rem;font-weight:700;color:var(--indigo);margin-bottom:.8rem}
.challenge-topics{display:grid;gap:.65rem}
.challenge-topic{display:flex;align-items:center;gap:.8rem;border:1px solid var(--rule);border-radius:6px;padding:1rem;cursor:pointer;background:var(--ivory);transition:border-color .15s,background .15s}
.challenge-topic:has(input:checked){border-color:var(--indigo);background:#edf0ee;box-shadow:inset 0 0 0 1px var(--indigo)}
.challenge-topic:has(input:focus-visible),.challenge-option:has(input:focus-visible){outline:3px solid var(--terracotta);outline-offset:3px}
.challenge-topic input,.challenge-option input{accent-color:var(--indigo);width:1.1rem;height:1.1rem;flex-shrink:0;margin:0;cursor:pointer}
.challenge-topic strong,.challenge-topic small{display:block}
.challenge-topic strong{color:var(--indigo);font-size:.81rem;line-height:1.3}
.challenge-topic small{color:var(--muted-fg);font-size:.7rem;margin-top:.2rem}
.challenge-setup__bottom{border-top:1px solid var(--rule-soft);padding-top:1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1.2rem}
.challenge-length{flex:1;min-width:0}
.challenge-length label{margin-bottom:.4rem}
.challenge-length select{max-width:100%;width:100%;font:inherit;font-size:.79rem;color:var(--indigo);background:var(--paper);padding:.75rem 1.8rem .75rem .75rem;border:1px solid var(--rule);border-radius:5px;min-height:46px}
.challenge-length p{font-size:.7rem;color:var(--muted-fg);margin:.6rem 0 0}
.history-challenge button{font-family:var(--sans);cursor:pointer}
.history-challenge .btn{font-size:.8rem;white-space:normal;text-align:center}
.challenge-aside{padding:1rem .5rem}
.challenge-aside h2{font-size:2rem;line-height:1.15;max-width:15ch}
.challenge-aside>p:not(.challenge-eyebrow){font-size:.84rem;color:var(--muted-fg);line-height:1.7}
.challenge-aside ol{list-style:none;padding:0;margin:1.6rem 0}
.challenge-aside li{display:flex;gap:.75rem;padding:.85rem 0;border-bottom:1px solid var(--rule);font-size:.76rem;color:var(--indigo)}
.challenge-aside li span{font-size:.63rem;color:var(--quiz-rust);font-weight:800;padding-top:.1rem}
.challenge-aside .text-link{font-size:.74rem}
.challenge-aside .challenge-aside__note{font-size:.72rem!important;margin-top:1.8rem}
.challenge-progress-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem;font-size:.74rem;font-weight:700;color:var(--indigo)}
.history-challenge progress{width:100%;height:5px;display:block;margin:.85rem 0 2rem;border:0;border-radius:5px;overflow:hidden;background:var(--rule-soft);accent-color:var(--atlas)}
.history-challenge progress::-webkit-progress-bar{background:var(--rule-soft)}
.history-challenge progress::-webkit-progress-value{background:var(--atlas)}
.history-challenge progress::-moz-progress-bar{background:var(--atlas)}
.challenge-options{display:grid;gap:.75rem}
.challenge-option{position:relative;display:flex;gap:.7rem;align-items:center;padding:.85rem 1rem;border:1px solid var(--rule);border-radius:6px;background:var(--ivory);font-size:.88rem;line-height:1.5;cursor:pointer}
.challenge-option:has(input:checked){border-color:var(--indigo);box-shadow:inset 0 0 0 1px var(--indigo)}
.challenge-option__letter{font-size:.65rem;font-weight:800;color:var(--muted-fg);border:1px solid var(--rule);padding:.2rem .4rem;border-radius:4px}
.challenge-option__text{min-width:0}
.challenge-option.is-correct{background:#e9f1e9;border-color:var(--quiz-green);box-shadow:inset 0 0 0 1px var(--quiz-green)}
.challenge-option.is-incorrect{background:#fbede6;border-color:var(--quiz-rust);box-shadow:inset 0 0 0 1px var(--quiz-rust)}
.challenge-option:has(input:disabled){cursor:default}
.challenge-option__result{display:block;color:var(--indigo);font-size:.66rem;font-weight:700;margin-top:.2rem}
.challenge-feedback{margin:1.5rem 0;background:#fbf3e4;border-left:3px solid var(--saffron);padding:1.1rem 1.2rem;border-radius:0 5px 5px 0}
.challenge-feedback.is-correct{background:#edf3ec;border-color:var(--quiz-green)}
.challenge-verdict{font-size:1rem;font-weight:800;color:var(--indigo);margin-bottom:.5rem}
.challenge-feedback>p:not(.challenge-verdict){font-size:.84rem;line-height:1.7;margin-bottom:.8rem}
.challenge-reading{display:flex;flex-wrap:wrap;gap:.5rem 1rem}
.challenge-reading a{font-size:.75rem;font-weight:700}
.challenge-round__actions{display:flex;gap:1rem;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:1.4rem}
.challenge-text-button{background:transparent;border:0;text-decoration:underline;text-underline-offset:.2em;color:var(--muted-fg);font-size:.72rem;padding:.7rem 0;min-height:44px}
.challenge-result-overview{display:flex;align-items:center;gap:1.8rem;margin:1.8rem 0;padding:1.4rem 0;border-block:1px solid var(--rule)}
.challenge-result-score{flex-shrink:0;margin:0;color:var(--indigo)}
.challenge-result-score strong{font:600 clamp(3.3rem,6vw,4.6rem)/1 var(--serif);display:block;letter-spacing:-.06em}
.challenge-result-score span{display:block;font-size:.68rem;margin-top:.5rem;text-align:center}
.challenge-result-overview>p:last-child{font-size:.85rem;line-height:1.65;margin:0;color:var(--muted-fg)}
.challenge-result-actions{display:flex;flex-wrap:wrap;gap:.6rem}
.challenge-review-title{margin-top:2.5rem}
.challenge-small{font-size:.78rem;color:var(--muted-fg)}
.challenge-review details{border-top:1px solid var(--rule);padding:1rem 0}
.challenge-review summary{display:flex;gap:.7rem;align-items:baseline;cursor:pointer;font-size:.82rem;font-weight:600;line-height:1.5;color:var(--indigo)}
.challenge-review summary::after{content:'+';font-size:1.1rem;margin-left:auto}
.challenge-review details[open]>summary::after{content:'−'}
.challenge-review summary::-webkit-details-marker{display:none}
.challenge-review-mark{font-size:.58rem;min-width:3.45rem;color:var(--quiz-rust);text-transform:uppercase;letter-spacing:.05em;font-weight:800}
.challenge-review-mark.is-correct{color:var(--quiz-green)}
.challenge-review details>p{font-size:.78rem;line-height:1.7}
.challenge-review details>.challenge-review-response{margin:1rem 0 .5rem;font-weight:700;color:var(--indigo)}
.challenge-collection{margin-top:3.2rem;margin-bottom:4rem;border-top:1px solid var(--rule);padding-top:1.4rem}
.challenge-collection>details>summary{font-family:var(--serif);font-size:1.35rem;color:var(--indigo);cursor:pointer}
.challenge-collection>details>p{font-size:.84rem;color:var(--muted-fg);margin-top:1rem}
.challenge-study-grid{display:grid;gap:.75rem;align-items:start;margin-top:1.5rem}
.challenge-study-question{border:1px solid var(--rule);border-radius:6px;background:var(--paper);padding:1rem}
.challenge-study-question summary{font-size:.82rem;line-height:1.5;font-weight:600;color:var(--indigo);cursor:pointer}
.challenge-study-question p{font-size:.8rem;margin:1rem 0 .5rem}
.challenge-study-question>a{display:block;font-size:.76rem;margin:.4rem 0}
.challenge-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(min-width:640px){.challenge-topics{grid-template-columns:1fr 1fr}.challenge-study-grid{grid-template-columns:1fr 1fr}.challenge-intro__inner{grid-template-columns:1.6fr 1fr}.challenge-stamp>strong{font-size:6rem}}
@media(min-width:1020px){.challenge-workspace{grid-template-columns:minmax(0,1fr) 290px;gap:3.5rem}.challenge-aside{padding-top:4.2rem}.challenge-stamp{justify-self:end;margin-right:2rem}.challenge-stamp>strong{font-size:7.2rem}}
@media(max-width:639px){.challenge-stamp{display:none}.challenge-result-overview{gap:1rem}.challenge-option{padding:.8rem;gap:.6rem}.challenge-option__letter{display:none}.challenge-setup__bottom>.btn{width:100%}.challenge-result-actions .btn{flex:1}.challenge-length{flex-basis:100%}}
@media(prefers-reduced-motion:reduce){.challenge-topic{transition:none}}