bug-hunt-exercise:not(:defined){display:none}.bh-intro-card{background:linear-gradient(135deg,var(--color-cream),#fff8e8);border:2px solid var(--color-amber);text-align:center}.bh-intro-icon{font-size:3rem;margin-bottom:.75rem;display:block}.bh-intro-title{font-size:1.6rem;color:var(--text-primary);margin-bottom:1rem}.bh-intro-story{font-size:1rem;color:var(--text-secondary);line-height:1.7;max-width:52ch;margin:0 auto 1rem}.bh-intro-quote{border-left:4px solid var(--color-teal);margin:1.25rem auto;padding:.75rem 1.25rem;font-style:italic;font-size:1.1rem;color:var(--color-teal-dark);background:#2b67770f;border-radius:0 8px 8px 0;max-width:42ch;text-align:left}.bh-question-title{font-size:1.25rem;color:var(--text-primary);margin-bottom:.5rem}.bh-instruction{font-size:.95rem;color:var(--text-muted);margin-bottom:1rem}.bh-code-block{border:2px solid var(--color-gray-100);border-left:4px solid var(--color-teal);border-radius:8px;overflow:hidden;margin-bottom:.5rem;background:#f9f9f9}.bh-line-btn{display:flex;align-items:center;gap:.75rem;width:100%;min-height:52px;padding:.75rem 1rem;background:transparent;border:none;border-bottom:1px solid var(--color-gray-100);font-family:Courier New,Courier,monospace;font-size:.95rem;cursor:pointer;text-align:left;transition:background-color .15s ease;-webkit-tap-highlight-color:transparent;color:var(--text-primary)}.bh-line-btn:last-child{border-bottom:none}.bh-line-btn:hover,.bh-line-btn:focus-visible{background:#e8f4f8;outline:none}.bh-line-btn:focus-visible{outline:3px solid var(--color-amber);outline-offset:-3px}.bh-line-btn--wrong{background:#fff8e1;color:var(--color-amber-dark)}.bh-line-btn--wrong:hover,.bh-line-btn--wrong:focus-visible{background:#fff3cd}.bh-line-number{display:inline-flex;align-items:center;justify-content:center;width:1.75rem;height:1.75rem;min-width:1.75rem;background:var(--color-teal);color:#fff;border-radius:50%;font-size:.8rem;font-weight:700;font-family:var(--font-body);flex-shrink:0}.bh-line-text{flex:1;line-height:1.4}.bh-line-display{display:flex;align-items:center;gap:.75rem;width:100%;min-height:52px;padding:.75rem 1rem;border-bottom:1px solid var(--color-gray-100);font-family:Courier New,Courier,monospace;font-size:.95rem;color:var(--text-primary)}.bh-line-display:last-child{border-bottom:none}.bh-line-display--bug{background:#fff3cd;border-left:3px solid var(--color-amber)}.bh-line-display--fixed{background:#e8f5e9;border-left:3px solid #4caf50}.bh-fix-options{display:flex;flex-direction:column;gap:.6rem;margin-top:.5rem}.bh-fix-btn{background:var(--color-white);color:var(--text-primary);border:2px solid var(--color-gray-100);text-align:left;font-weight:500;font-family:Courier New,Courier,monospace;font-size:.95rem;padding:.85rem 1.1rem;min-height:52px;border-radius:8px;cursor:pointer;transition:border-color .15s ease,background-color .15s ease;-webkit-tap-highlight-color:transparent;width:100%}.bh-fix-btn:hover:not(:disabled){border-color:var(--color-teal);background:#f0fafb}.bh-fix-btn:focus-visible{outline:3px solid var(--color-amber);outline-offset:2px}.bh-fix-btn--wrong{border-color:var(--color-amber)!important;background:#fff8e1!important;color:var(--color-amber-dark)!important;opacity:.7}.bh-fix-btn:disabled{cursor:not-allowed}.bh-summary{text-align:center}.bh-summary-icon{font-size:3.5rem;margin-bottom:1rem;display:block}.bh-summary-title{font-size:1.5rem;color:var(--text-primary);margin-bottom:.5rem;line-height:1.3}.bh-summary-score{font-size:1.3rem;font-weight:700;color:var(--color-teal);margin-bottom:1rem}.bh-score-bar-wrap{height:12px;background:var(--color-gray-100);border-radius:6px;overflow:hidden;max-width:400px;margin:0 auto 1.5rem}.bh-score-bar-fill{height:100%;background:var(--color-teal);border-radius:6px;transition:width .6s ease}.bh-summary-encouragement{font-size:.95rem;color:var(--text-secondary);line-height:1.7;max-width:50ch;margin:0 auto}@media(max-width:480px){.bh-line-btn,.bh-line-display{font-size:.88rem;padding:.65rem .75rem;gap:.5rem}.bh-fix-btn{font-size:.88rem;padding:.75rem .85rem}.bh-intro-title,.bh-summary-title{font-size:1.3rem}.bh-line-number{width:1.5rem;height:1.5rem;min-width:1.5rem;font-size:.75rem}}