.quiz-setup{padding:2rem;max-height:90vh;overflow-y:auto;display:flex;align-items:center;justify-content:center}.setup-card{width:100%;max-width:500px;color:var(--text-primary)}.setup-card h2{color:var(--text-primary);font-size:1.75rem;margin-bottom:1.5rem;text-align:center}.setup-option{margin-bottom:1.25rem}.setup-option>label{display:block;color:var(--text-secondary);font-weight:600;margin-bottom:.5rem;font-size:.95rem}.setup-option input[type=number]{width:100%;padding:.75rem;font-size:1rem;border:2px solid var(--border-primary);border-radius:10px;background:var(--bg-primary);color:var(--text-primary)!important;transition:border-color .3s ease,background .3s ease}.setup-option input[type=number]:focus{outline:none;border-color:var(--accent-purple)}.module-checkboxes{display:flex;flex-direction:column;gap:.4rem;padding:.75rem;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border-primary);max-height:200px;overflow-y:auto;transition:background .3s ease,border-color .3s ease}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;padding:.35rem .5rem;border-radius:4px;transition:background-color .2s ease;color:var(--text-primary)}.checkbox-label:hover{background:var(--bg-tertiary)}.checkbox-label:first-child{font-weight:600;padding-bottom:.5rem;border-bottom:1px solid var(--border-secondary);margin-bottom:.25rem}.checkbox-label input[type=checkbox],.checkbox-label input[type=radio]{width:16px;height:16px;cursor:pointer;accent-color:var(--accent-purple);flex-shrink:0}.checkbox-label span{font-size:.9rem;color:var(--text-primary)}.start-button{width:100%;padding:.85rem;font-size:1.1rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:8px;margin-top:1rem;box-shadow:0 4px 15px #667eea66}.start-button:hover{box-shadow:0 6px 20px #667eea99}.info{margin-top:1rem;text-align:center;color:var(--text-tertiary);font-size:.85rem}.info strong{color:var(--accent-purple);font-size:1rem}.warning-text{color:#f59e0b;font-weight:600;margin-top:.5rem;padding:.4rem .6rem;background:#fef3c7;border-radius:4px;font-size:.8rem}body.dark-mode .warning-text{background:#422006;color:#fbbf24}@media (max-width: 768px){.quiz-setup{padding:1.5rem 1rem}.module-checkboxes{max-height:150px}}.question-container{padding:3rem;color:var(--text-primary)!important}.question-container *{color:inherit}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;flex-wrap:wrap;gap:1rem}.question-counter{color:var(--text-tertiary);font-weight:600;font-size:1rem}.module-badge{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:.4rem 1rem;border-radius:20px;font-size:.9rem;font-weight:600}.question-content h2{font-size:1.5rem;margin-bottom:1rem;line-height:1.5;color:var(--text-primary)}.question-text{font-size:1.25rem;margin-bottom:1.5rem;line-height:1.6;color:var(--text-primary)}.question-text .text-segment{display:block;margin-bottom:.5rem}.question-text .text-segment:last-child{margin-bottom:0}.question-text .embedded-code{margin:1rem 0;font-size:.85rem}.question-text .embedded-code+.text-segment{margin-top:1rem}.instruction-text{color:var(--accent-purple);font-weight:600;font-style:italic;margin-bottom:1rem;font-size:.95rem}.question-image{margin:1.5rem 0;padding:1rem;background:var(--bg-secondary);border:2px solid var(--border-primary);border-radius:10px;text-align:center;transition:background .3s ease,border-color .3s ease}.question-image img{max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 12px #0000001a}.code-block{background:var(--code-bg);color:var(--code-text);padding:1.25rem 1.5rem;border-radius:10px;margin:1.5rem 0;overflow-x:auto;font-size:.875rem;line-height:1.7;border:1px solid var(--border-primary);box-shadow:inset 0 1px 3px #0003;transition:background .3s ease,border-color .3s ease}.code-block code{font-family:SF Mono,Monaco,Menlo,Ubuntu Mono,Consolas,monospace;white-space:pre;display:block}.embedded-code{background:var(--code-bg);border-left:3px solid var(--accent-purple)}.inline-code{background:var(--inline-code-bg);color:var(--inline-code-text);padding:.2em .4em;border-radius:3px;font-size:.9em;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-weight:500;border:1px solid var(--inline-code-border);transition:background .3s ease,border-color .3s ease}.options{display:flex;flex-direction:column;gap:1rem;margin:2rem 0}.option{display:flex;align-items:center;gap:1rem;padding:1.2rem;background:var(--bg-secondary);border:2px solid var(--border-primary);border-radius:10px;text-align:left;font-size:1rem;transition:all .3s ease;width:100%}.option:hover:not(:disabled){background:var(--bg-tertiary);border-color:var(--accent-purple);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.option:disabled{cursor:not-allowed}.option.selected{background:var(--accent-purple-light);border-color:var(--accent-purple)}.option.correct{background:#d1fae5;border-color:#22c55e}.option.incorrect{background:#fee2e2;border-color:#ef4444}.option-letter{font-weight:700;color:var(--accent-purple);min-width:25px}.option.correct .option-letter{color:#22c55e}.option.incorrect .option-letter{color:#ef4444}.option-text{flex:1;color:var(--text-primary)}.option-text .text-segment{display:inline}.option-text .embedded-code{display:block;margin:.5rem 0;padding:.75rem;font-size:.8rem;border-radius:6px}.option-text .embedded-code:first-child{margin-top:0}.option-text .embedded-code:last-child{margin-bottom:0}.option-checkbox{display:flex;align-items:center;min-width:25px}.option-checkbox input[type=checkbox]{width:18px;height:18px;cursor:pointer;pointer-events:none}.check-mark{color:#22c55e;font-size:1.2rem;font-weight:700;margin-left:auto}.submit-button{width:100%;padding:1rem;font-size:1.1rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;margin-top:1rem;box-shadow:0 4px 15px #667eea66}.submit-button:hover{box-shadow:0 6px 20px #667eea99}.correct-answer-display{color:var(--text-secondary);padding:.75rem;background:var(--bg-tertiary);border-radius:8px;margin-bottom:1rem;border-left:4px solid #22c55e;transition:background .3s ease}.correct-answer-display strong{color:var(--text-primary)}.answer-feedback{margin-top:2rem;padding:1.5rem;background:var(--bg-secondary);border-radius:10px;transition:background .3s ease}.feedback-message{font-size:1.2rem;font-weight:700;margin-bottom:1rem;padding:1rem;border-radius:8px;text-align:center}.feedback-message.success{background:#d1fae5;color:#22c55e}.feedback-message.error{background:#fee2e2;color:#ef4444}.next-button{width:100%;padding:1rem;font-size:1.1rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;box-shadow:0 4px 15px #667eea66}.next-button:hover{box-shadow:0 6px 20px #667eea99}@media (max-width: 768px){.question-container{padding:2rem 1.5rem}.question-content h2{font-size:1.3rem}.code-block{font-size:.8rem;padding:1rem}.question-image{padding:.5rem}.question-image img{max-width:100%;height:auto}}.results-container{padding:3rem;color:var(--text-primary)!important}.results-container *{color:inherit}.results-card{max-width:800px;margin:0 auto}.results-card h2{text-align:center;font-size:2rem;margin-bottom:2rem;color:var(--text-primary)}.score-display{text-align:center;padding:2rem;margin-bottom:3rem;border-radius:15px;background:var(--bg-secondary);border:4px solid;transition:background .3s ease}.score-percentage{font-size:4rem;font-weight:700;margin-bottom:.5rem}.score-fraction{font-size:1.2rem;color:var(--text-tertiary)}.results-breakdown{margin-top:2rem}.results-breakdown h3{font-size:1.5rem;margin-bottom:1.5rem;color:var(--text-primary)}.result-item{background:var(--bg-secondary);padding:1.5rem;border-radius:10px;margin-bottom:1rem;border:2px solid var(--border-primary);transition:background .3s ease,border-color .3s ease}.result-header{display:flex;align-items:center;gap:.75rem;margin-bottom:.75rem}.result-icon{font-size:1.5rem;font-weight:700;width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%}.result-icon.correct{color:#22c55e;background:#d1fae5}.result-icon.incorrect{color:#ef4444;background:#fee2e2}.result-title{font-weight:600;color:var(--text-secondary)}.result-question{margin-bottom:.75rem;color:var(--text-primary);font-weight:500}.result-answers{display:flex;flex-direction:column;gap:.5rem}.answer-correct{color:#22c55e;font-weight:500}.answer-incorrect{color:#ef4444;font-weight:500}.results-actions{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}.retry-wrong-button{width:100%;padding:1rem;font-size:1.2rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#f59e0b,#ef4444);border:none;border-radius:10px;cursor:pointer;box-shadow:0 4px 15px #f59e0b66;transition:all .2s ease}.retry-wrong-button:hover{box-shadow:0 6px 20px #f59e0b99;transform:translateY(-2px)}.retry-button{width:100%;padding:1rem;font-size:1.2rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;cursor:pointer;box-shadow:0 4px 15px #667eea66;transition:all .2s ease}.retry-button:hover{box-shadow:0 6px 20px #667eea99;transform:translateY(-2px)}@media (max-width: 768px){.results-container{padding:2rem 1.5rem}.results-card h2{font-size:1.5rem}.score-percentage{font-size:3rem}.result-item{padding:1rem}}.App{width:100%;max-width:900px;margin:0 auto;display:flex;flex-direction:column;min-height:100vh}header{text-align:center;margin-bottom:2rem}.header-content{display:flex;align-items:center;justify-content:center;gap:2rem;flex-wrap:wrap}.header-subtitle{color:var(--text-primary);text-shadow:1px 1px 2px rgba(0,0,0,.3)}.dark-mode-toggle{background:#fff3;border:2px solid rgba(255,255,255,.3);border-radius:50%;width:50px;height:50px;font-size:1.5rem;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.dark-mode-toggle:hover{background:#ffffff4d;transform:translateY(-2px) rotate(15deg);box-shadow:0 4px 12px #0003}.dark-mode-toggle:active{transform:translateY(0) rotate(0)}header h1{color:var(--text-primary);font-size:2.5rem;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.2);margin:0}main{background:var(--bg-primary);border-radius:20px;box-shadow:0 20px 60px #0000004d;overflow:hidden;color:var(--text-primary);flex:1;transition:background .3s ease,color .3s ease}footer{text-align:center;padding:1.5rem 1rem;margin-top:2rem;color:var(--text-primary);font-size:.95rem}footer p{margin:0;text-shadow:1px 1px 2px rgba(0,0,0,.3);font-weight:500}footer a{color:#fde68a;text-decoration:none;font-weight:600;transition:all .3s ease;border-bottom:2px solid transparent;padding-bottom:2px}footer a:hover{color:#fef3c7;border-bottom-color:#fef3c7;text-shadow:0 0 8px rgba(253,230,138,.5)}@media (max-width: 768px){header h1{font-size:2rem}footer{font-size:.85rem;padding:1rem;margin-top:1.5rem}#root{padding:1rem}}*{margin:0;padding:0;box-sizing:border-box}:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--bg-gradient-start: #667eea;--bg-gradient-end: #764ba2;--text-primary: #1f2937;--text-secondary: #4b5563;--text-tertiary: #6b7280;--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--border-primary: #e5e7eb;--border-secondary: #d1d5db;--code-bg: #1e293b;--code-text: #e2e8f0;--inline-code-bg: #f3f4f6;--inline-code-text: #e74c3c;--inline-code-border: #e5e7eb;--accent-purple: #667eea;--accent-purple-light: #ede9fe}body.dark-mode{--bg-gradient-start: #1e293b;--bg-gradient-end: #0f172a;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-tertiary: #94a3b8;--bg-primary: #1e293b;--bg-secondary: #0f172a;--bg-tertiary: #334155;--border-primary: #334155;--border-secondary: #475569;--code-bg: #0f172a;--code-text: #e2e8f0;--inline-code-bg: #334155;--inline-code-text: #fca5a5;--inline-code-border: #475569;--accent-purple: #818cf8;--accent-purple-light: #312e81}body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg-gradient-start) 0%,var(--bg-gradient-end) 100%);color:var(--text-primary);transition:background .3s ease}#root{width:100%;min-height:100vh;padding:2rem}button{font-family:inherit;cursor:pointer;transition:all .3s ease;color:inherit}button:hover{transform:translateY(-2px)}button:active{transform:translateY(0)}code{font-family:Courier New,Courier,monospace}