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a:hover{background-color:var(--bg-tertiary);color:var(--brand-primary);font-weight:600}.notification-badge{display:none;min-width:20px;height:20px;padding:0 6px;background-color:#ef4444;color:#fff;font-size:.75rem;font-weight:600;line-height:20px;border-radius:10px;text-align:center}#main-notification-badge{position:absolute;top:-8px;right:8px;box-shadow:0 0 0 2px var(--bg-secondary)}.section-nav-menu .notification-badge{box-shadow:none}.progress-badge-nav{font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:10px;color:#fff;transition:background-color 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1px 2px rgba(0,0,0,.4)}#progress-fill{width:0;height:100%;background:var(--brand-primary);transition:width .4s cubic-bezier(.61,1,.88,1),background-color .4s ease}fieldset.question{border:1px solid var(--border-color);border-radius:16px;padding:1.5rem 2rem;margin-bottom:1.5rem;background:var(--bg-secondary);box-shadow:var(--shadow-md);position:relative;min-width:0}.question-text{font-size:1.25rem;font-weight:600;margin-bottom:1.5rem;color:var(--text-primary)}label{display:flex;align-items:center;gap:.75rem;margin-bottom:.75rem;padding:.85rem 1rem;border:1px solid var(--border-color);border-radius:10px;cursor:pointer;transition:all .2s;color:var(--text-secondary)}label:hover{border-color:var(--brand-primary);color:var(--text-primary)}input[type=radio]{width:1.15em;height:1.15em;accent-color:var(--brand-primary)}label.correct-answer{color:#166534;background-color:#dcfce7;border-color:#22c55e;font-weight:600}label.incorrect-answer{color:#991b1b;background-color:#fee2e2;border-color:#ef4444;font-weight:600}[data-theme=dark] label.correct-answer{color:#bbf7d0;background-color:rgba(34,197,94,.15);border-color:#4ade80}[data-theme=dark] label.incorrect-answer{color:#fca5a5;background-color:rgba(239,68,68,.15);border-color:#f87171}.explanation{display:none;opacity:0;transition:opacity .3s;border-radius:10px;padding:1em 1.25em;margin-top:1.5em;font-weight:500;line-height:1.7;background:#dcfce7;color:#166534;border:1px solid #22c55e}[data-theme=dark] .explanation{background:rgba(34,197,94,.15);color:#bbf7d0;border:1px solid #4ade80}fieldset.question.show-explanation 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