.unit-header[data-astro-cid-2jtnh6d3]{position:relative;color:#fff;padding:2rem 0 2.5rem;overflow:hidden}.unit-header-bg[data-astro-cid-2jtnh6d3]{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}.unit-header-overlay[data-astro-cid-2jtnh6d3]{position:absolute;inset:0;background:linear-gradient(135deg,#1e3a5fe0,#1e40afd1);z-index:1}.unit-header-content[data-astro-cid-2jtnh6d3]{position:relative;z-index:2}.unit-header[data-astro-cid-2jtnh6d3] h1[data-astro-cid-2jtnh6d3]{font-size:1.75rem;margin-bottom:.5rem}.unit-meta[data-astro-cid-2jtnh6d3]{font-size:.875rem;opacity:.85;display:flex;gap:.5rem;align-items:center}.meta-sep[data-astro-cid-2jtnh6d3]{opacity:.5}.back-link[data-astro-cid-2jtnh6d3]{color:#fffc;text-decoration:none;font-size:.875rem}.back-link[data-astro-cid-2jtnh6d3]:hover{color:#fff}.unit-badge[data-astro-cid-2jtnh6d3]{font-size:.75rem;background:#ffffff26;padding:.25rem .75rem;border-radius:999px}.ai-cta-card[data-astro-cid-2jtnh6d3]{background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius);padding:1.5rem;margin-bottom:2rem}.ai-cta-card[data-astro-cid-2jtnh6d3] h3[data-astro-cid-2jtnh6d3]{font-size:1rem;margin-bottom:.5rem;color:var(--color-primary)}.ai-cta-card[data-astro-cid-2jtnh6d3] p[data-astro-cid-2jtnh6d3]{font-size:.875rem;margin-bottom:.75rem}.ai-cta-card[data-astro-cid-2jtnh6d3] ul[data-astro-cid-2jtnh6d3]{font-size:.875rem;padding-left:1.5rem;list-style:disc}.unit-actions[data-astro-cid-2jtnh6d3]{margin:2.5rem 0 2rem;text-align:center}.unit-nav[data-astro-cid-2jtnh6d3]{display:flex;justify-content:space-between;padding-top:1.5rem;border-top:1px solid var(--color-border)}.unit-nav[data-astro-cid-2jtnh6d3] a[data-astro-cid-2jtnh6d3]{color:var(--color-primary);text-decoration:none;font-weight:500}.unit-nav[data-astro-cid-2jtnh6d3] a[data-astro-cid-2jtnh6d3]:hover{text-decoration:underline}.nav-done[data-astro-cid-2jtnh6d3]{color:var(--color-success)!important;font-weight:600!important}.mermaid-container{margin:1.25rem 0;padding:1.5rem;background:#f8fafc;border:1px solid var(--color-border);border-radius:var(--radius);overflow-x:auto;text-align:center}.mermaid-container svg{max-width:100%;height:auto}.code-btn-group[data-astro-cid-2jtnh6d3]{position:absolute;top:.5rem;right:.5rem;display:flex;gap:.375rem}.code-copy-btn[data-astro-cid-2jtnh6d3],.code-ai-btn[data-astro-cid-2jtnh6d3]{font-size:.7rem;padding:.25rem .5rem;border:none;border-radius:4px;cursor:pointer;font-family:inherit;line-height:1.4;transition:opacity .2s,background .2s}.code-copy-btn[data-astro-cid-2jtnh6d3]{background:#ffffff26;color:#ffffffbf}.code-copy-btn[data-astro-cid-2jtnh6d3]:hover{background:#ffffff40;color:#fff}.code-copy-btn[data-astro-cid-2jtnh6d3].copied{background:var(--color-success);color:#fff}.code-ai-btn[data-astro-cid-2jtnh6d3]{background:#3b82f6;color:#fff}.code-ai-btn[data-astro-cid-2jtnh6d3]:hover{background:#2563eb}.quiz-options{display:flex;flex-direction:column;gap:.5rem;margin:.75rem 0 1rem}.quiz-option{display:flex;align-items:flex-start;gap:.625rem;padding:.75rem 1rem;border:2px solid var(--color-border);border-radius:var(--radius);cursor:pointer;transition:border-color .2s,background .2s,box-shadow .2s;line-height:1.6;font-size:.95rem}.quiz-option:hover{border-color:var(--color-primary-light);background:#f0f4ff}.quiz-option input[type=radio]{display:none}.quiz-radio{flex-shrink:0;width:20px;height:20px;border:2px solid #94a3b8;border-radius:50%;margin-top:2px;position:relative;transition:border-color .2s,background .2s}.quiz-option input[type=radio]:checked~.quiz-radio{border-color:var(--color-primary);background:var(--color-primary)}.quiz-option input[type=radio]:checked~.quiz-radio:after{content:"";position:absolute;top:4px;left:4px;width:8px;height:8px;background:#fff;border-radius:50%}.quiz-option-letter{font-weight:600;color:var(--color-primary);flex-shrink:0}.quiz-option-text{flex:1}.quiz-option.quiz-correct{border-color:var(--color-success);background:#f0fdf4;box-shadow:0 0 0 1px var(--color-success)}.quiz-option.quiz-correct .quiz-radio{border-color:var(--color-success);background:var(--color-success)}.quiz-option.quiz-wrong{border-color:var(--color-danger);background:#fef2f2;box-shadow:0 0 0 1px var(--color-danger)}.quiz-option.quiz-wrong .quiz-radio{border-color:var(--color-danger);background:var(--color-danger)}.quiz-unanswered{animation:quiz-shake .4s ease}@keyframes quiz-shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.quiz-submit-container{text-align:center;margin:2rem 0}.quiz-submit-btn{min-width:160px;font-size:1rem;padding:.75rem 2rem}.quiz-score{margin-top:1rem;padding:1rem 1.25rem;background:#f0f4ff;border:1px solid var(--color-primary-light);border-radius:var(--radius);font-size:1.05rem;font-weight:500;opacity:0;transform:translateY(8px);transition:opacity .3s,transform .3s;text-align:center}.quiz-score.quiz-score-show{opacity:1;transform:translateY(0)}