[data-mode-theme="challenge"] .assessment-nav{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;max-width:920px;margin:16px 0 20px}
[data-mode-theme="challenge"] .assessment-nav button{min-width:0;min-height:48px;padding:8px;border:1px solid var(--color-control-border);background:var(--color-surface);color:var(--color-text);font-weight:700}
[data-mode-theme="challenge"] .assessment-nav [aria-current="step"]{background:var(--mode-challenge);border-color:var(--mode-challenge);color:var(--color-on-action)}
[data-mode-theme="challenge"] .assessment-nav .challenge-task-done:not([aria-current="step"]){border-color:var(--color-success)}
[data-mode-theme="challenge"] .challenge-task{border-top:4px solid var(--mode-challenge)}
[data-mode-theme="challenge"] .challenge-task h2{font-size:clamp(1.2rem,2vw,1.5rem);margin-bottom:16px}
[data-mode-theme="challenge"] .challenge-task>.learn-sentence{font-size:clamp(1.1rem,2vw,1.35rem);line-height:1.6;margin:12px 0}
[data-mode-theme="challenge"] .challenge-step-track{display:flex;gap:6px;margin:24px 0 20px}
[data-mode-theme="challenge"] .challenge-step-track span{flex:1;height:6px;border-radius:6px;background:var(--color-border)}
[data-mode-theme="challenge"] .challenge-step-track span.completed{background:var(--color-success)}
[data-mode-theme="challenge"] .challenge-step-track span.active{background:var(--mode-challenge)}
[data-mode-theme="challenge"] .challenge-task .assessment-field{border-top:1px solid var(--color-border);padding-top:20px}
[data-mode-theme="challenge"] .challenge-task .assessment-field label{display:block;font-weight:700;font-size:1.05rem;line-height:1.5;margin-bottom:12px}
[data-mode-theme="challenge"] .challenge-task .assessment-field label::before{content:none}
[data-mode-theme="challenge"] .challenge-task .assessment-field textarea{width:100%;min-height:96px;border-color:var(--color-control-border)}
[data-mode-theme="challenge"] .challenge-task>.learn-actions{margin-top:20px;flex-wrap:wrap}
[data-mode-theme="challenge"] .challenge-hierarchy{background:var(--color-surface-soft);border-left:3px solid var(--mode-challenge);padding:12px 16px;margin:18px 0}
[data-mode-theme="challenge"] .challenge-hierarchy .learn-sentence{margin:4px 0;line-height:1.8}
[data-mode-theme="challenge"] .challenge-message{font-size:.9rem;color:var(--color-muted)}
@media(max-width:560px){[data-mode-theme="challenge"] .assessment-nav{grid-template-columns:repeat(3,minmax(0,1fr))}[data-mode-theme="challenge"] .challenge-task>.learn-actions button{flex:1 1 140px}}
@media(forced-colors:active){[data-mode-theme="challenge"] .assessment-nav [aria-current="step"],[data-mode-theme="challenge"] .challenge-step-track span.active{outline:2px solid Highlight}}