:root{--primary:#073763;--primary-hover:#052c50;--secondary:#64748b;--accent:#ffc000;--background:#fff;--surface:#fff;--surface-alt:#f8fafc;--text-main:#0f172a;--text-secondary:#475569;--success:#10b981;--error:#ef4444;--border:#e2e8f0;--radius:12px;--radius-sm:8px;--shadow:0 1px 3px 0 #0000001a,0 1px 2px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px #0000001a;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}body{font-family:var(--font-family);color:var(--text-main);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.5}.app{flex-direction:column;min-height:auto;display:flex}.main-content{flex:1;justify-content:center;align-items:center;padding:.5rem;display:flex}.start-screen{text-align:center;background:var(--surface);border-radius:var(--radius);max-width:600px;box-shadow:var(--shadow-lg);border:1px solid var(--border);padding:1.5rem}.icon-wrapper{background:var(--primary);border-radius:50%;justify-content:center;align-items:center;width:80px;height:80px;margin:0 auto 1.5rem;display:flex;box-shadow:0 4px 6px -1px #0737634d}.hero-icon{color:var(--accent)}h1{color:var(--text-main);margin:0 0 .5rem;font-size:2rem;font-weight:700}.subtitle{color:var(--text-secondary);margin-bottom:2rem;font-size:1.125rem}.features{justify-content:center;gap:1.5rem;margin-bottom:2.5rem;display:flex}.feature-item{color:var(--text-secondary);background:var(--surface-alt);border-radius:999px;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9rem;font-weight:500;display:flex}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:999px;align-items:center;gap:.5rem;padding:.875rem 2rem;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex;box-shadow:0 4px 6px -1px #2563eb33}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 6px 8px -1px #2563eb4d}.btn-primary:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.btn-secondary{color:var(--text-secondary);border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:999px;align-items:center;gap:.5rem;padding:.875rem 1.5rem;font-size:1rem;font-weight:500;transition:all .2s;display:inline-flex}.btn-secondary:hover:not(:disabled){background:var(--surface-alt);color:var(--text-main);border-color:#cbd5e1}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.quiz-container{background:var(--surface);border-radius:var(--radius);width:100%;max-width:700px;box-shadow:var(--shadow-lg);border:1px solid var(--border);position:relative;overflow:hidden}.progress-bar-container{background:var(--surface-alt);width:100%;height:4px}.progress-bar{background:var(--accent);height:100%;transition:width .3s}.quiz-header{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex}.question-counter{color:var(--primary);text-transform:uppercase;letter-spacing:.05em;border-left:4px solid var(--accent);background:#f1f5f9;border-radius:6px;padding:.25rem .75rem;font-size:.875rem;font-weight:700}.question-container{padding:2rem}.question-header{flex-direction:column;gap:.5rem;margin-bottom:1.5rem;display:flex}.badge-multi{background:var(--primary);color:var(--accent);letter-spacing:.05em;text-transform:uppercase;border-radius:999px;align-self:flex-start;padding:.25rem .75rem;font-size:.75rem;font-weight:700}.question-text{color:var(--text-main);margin:0;font-size:1.25rem;font-weight:600;line-height:1.5}.options-grid{flex-direction:column;gap:.75rem;display:flex}.question-image-container{justify-content:center;width:100%;margin:1rem 0;display:flex}.question-image{object-fit:contain;border-radius:8px;max-width:100%;max-height:300px;box-shadow:0 2px 4px #0000001a}@media (max-width:480px){.question-image{max-height:200px}}.option-card{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;text-align:left;width:100%;color:var(--text-main);background:#fff;align-items:center;gap:1rem;padding:1rem 1.25rem;font-family:inherit;font-size:1rem;transition:all .2s;display:flex;position:relative}.option-card:hover:not(:disabled){border-color:var(--primary);background:#f8fafc}.option-card.selected{border-color:var(--primary);color:var(--primary);box-shadow:0 0 0 1px var(--primary);background:#eff6ff;font-weight:500}.option-card.correct{border-color:var(--success);color:#065f46;box-shadow:0 0 0 1px var(--success);background:#ecfdf5}.option-card.incorrect{border-color:var(--error);color:#991b1b;box-shadow:0 0 0 1px var(--error);background:#fef2f2}.option-card.dimmed{opacity:.6;border-color:var(--border);background:#f1f5f9}.option-marker{color:#cbd5e1;flex-shrink:0;align-items:center;display:flex}.option-card.selected .option-marker{color:var(--primary)}.option-card.correct .option-marker{color:var(--success)}.option-card.incorrect .option-marker{color:var(--error)}.feedback-message{margin-top:1.5rem;animation:.3s fadeIn}.feedback-success{color:var(--success);border-radius:var(--radius-sm);background:#ecfdf5;align-items:center;gap:.5rem;padding:1rem;font-weight:600;display:flex}.feedback-error{color:var(--error);border-radius:var(--radius-sm);background:#fef2f2;align-items:center;gap:.5rem;padding:1rem;font-weight:600;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.quiz-controls{border-top:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex}.result-container{width:100%;max-width:700px;margin:0 auto;padding-bottom:4rem}.score-card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);text-align:center;border:1px solid var(--border);margin-bottom:2rem;padding:2.5rem}.score-card.passing{border-top:6px solid var(--success)}.score-card.failing{border-top:6px solid var(--error)}.score-header{color:var(--text-secondary);margin-bottom:1rem;font-size:1.125rem;font-weight:500}.score-value{letter-spacing:-.02em;margin-bottom:.5rem;font-size:3.5rem;font-weight:800;line-height:1}.score-percentage{color:var(--text-secondary);margin-bottom:1.5rem;font-size:1.25rem}.score-message{font-size:1.125rem;font-weight:600}.passing .score-value{color:var(--success)}.failing .score-value{color:var(--error)}.review-section{flex-direction:column;gap:1rem;display:flex}.review-section h3{color:var(--text-main);margin-bottom:1rem;font-size:1.25rem}.review-item{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);border-left:4px solid #0000;padding:1.5rem}.review-item.correct{border-left-color:var(--success)}.review-item.incorrect{border-left-color:var(--error)}.review-header{justify-content:space-between;margin-bottom:.75rem;display:flex}.review-number{color:var(--text-secondary);font-size:.875rem;font-weight:600}.icon-correct{color:var(--success)}.icon-incorrect{color:var(--error)}.review-question{margin:0 0 1rem;font-size:1rem;font-weight:600}.review-answers{flex-direction:column;gap:.75rem;font-size:.9rem;display:flex}.label{text-transform:uppercase;color:var(--text-secondary);margin-bottom:.25rem;margin-right:.5rem;font-size:.75rem;font-weight:600;display:block}.answer-text{display:block}.user-answer .answer-text{color:var(--text-main)}.correct-answer .answer-text{color:var(--success);font-weight:500}.restart-btn{justify-content:center;width:100%;margin-top:2rem}@media (max-width:640px){.main-content{padding:.5rem}.start-screen,.quiz-container,.score-card{padding:1.25rem}h1{font-size:1.5rem}.question-text{font-size:1.125rem}.quiz-controls{padding:1rem}.btn-primary,.btn-secondary{padding:.75rem 1rem;font-size:.9rem}}@media (max-width:480px){.start-screen,.quiz-container,.score-card{border-radius:var(--radius-sm);padding:1rem}.question-container{padding:1.25rem 1rem}.question-text{margin-bottom:1rem;font-size:1rem}.option-card{padding:.75rem 1rem;font-size:.9rem}.quiz-controls{gap:.5rem;padding:1rem}.btn-primary,.btn-secondary{justify-content:center;width:100%;padding:.6rem 1rem;font-size:.85rem}.quiz-controls{flex-direction:column-reverse;gap:.75rem}.btn-primary,.btn-secondary{width:100%}}#root{text-align:center;max-width:1280px;margin:0 auto;padding:2rem}.logo{will-change:filter;height:6em;padding:1.5em;transition:filter .3s}.logo:hover{filter:drop-shadow(0 0 2em #646cffaa)}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (prefers-reduced-motion:no-preference){a:nth-of-type(2) .logo{animation:20s linear infinite logo-spin}}.card{padding:2em}.read-the-docs{color:#888}