.discovery-highlights { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 20px; margin: 28px 0; }
.discovery-highlight { padding: clamp(20px,3vw,30px); border-top: 4px solid var(--primary); }
.discovery-highlight h2 { margin: 10px 0; line-height: 1.3; }
.discovery-highlight p { margin: 0 0 18px; }
.discovery-kicker { color: var(--primary); font-weight: 700; }
.discovery-note { color: var(--muted); font-size: .9rem; }
.challenge-topline { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center; }
.challenge-topline p { margin: 20px 0 8px; }
.challenge-clock { color: var(--primary); font-variant-numeric: tabular-nums; }
.challenge-clock strong { font-size: 1.7rem; margin-left: 8px; }
.challenge-clock.is-urgent { color: #b42318; }
#challenge-progress { display: block; width: 100%; accent-color: var(--primary); margin: 10px 0 20px; }
.challenge-code { background: #111e34; color: #eff6ff; padding: 22px; border-radius: 12px; overflow-x: auto; white-space: pre; font: .95rem/1.75 ui-monospace,SFMono-Regular,Consolas,monospace; }
.tool-panel #challenge-options { border: 0; padding: 0; margin: 20px 0; }
#challenge-options legend { font-weight: 700; }
.tool-panel #challenge-choices label { display: flex; align-items: flex-start; gap: 12px; padding: 14px; margin: 10px 0; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; font-weight: 500; }
#challenge-choices label:has(input:checked) { border-color: var(--primary); background: #eef5ff; }
#challenge-choices input { flex: 0 0 auto; margin-top: 6px; accent-color: var(--primary); }
.challenge-score { color: var(--primary); font-size: clamp(2rem,7vw,3.5rem); line-height: 1.2; font-weight: 800; margin: 20px 0; }
.challenge-review-item { padding: 22px 0; border-top: 1px solid var(--line); }
.challenge-review-item h4 { margin: 0 0 12px; font-size: 1.1rem; }
.challenge-review-item .challenge-code { font-size: .85rem; }
.finder-examples { display: flex; flex-wrap: wrap; gap: 10px; }
.finder-list { display: grid; gap: 18px; margin: 20px 0; }
.finder-result { border: 1px solid var(--line); padding: 22px; border-radius: 12px; }
.finder-result h3 { margin: 0 0 10px; }
.finder-result .quiz-submit { display: inline-block; }
#finder-problem { resize: vertical; }
[data-tool-page] :is(button,a,input,select,textarea):focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
@media (max-width: 650px) {
    .discovery-highlights { grid-template-columns: 1fr; }
    .challenge-code { padding: 16px; font-size: .8rem; }
    .finder-examples button { width: 100%; text-align: left; }
}

.challenge-question-time { display: inline-block; background: #eef5ff; color: #174d8a; border-radius: 8px; padding: 8px 12px; font-weight: 650; font-variant-numeric: tabular-nums; }