:root{--primary-color:#4f46e5;--primary-hover:#4338ca;--secondary-color:#64748b;--background-color:#f1f5f9;--text-dark:#1e293b;--text-light:#64748b;--card-background:#fff;--border-color:#e2e8f0;--success-bg:#dcfce7;--success-text:#166534;--error-bg:#fee2e2;--error-text:#991b1b;--selected-bg:#e0e7ff;--selected-text:#3730a3;--selected-border:#a5b4fc}body{background-color:#f1f5f9;background-color:var(--background-color);color:#1e293b;color:var(--text-dark);font-family:Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;margin:0}.navbar{align-items:center;background:#fff;border-bottom:1px solid #e2e8f0;border-bottom:1px solid var(--border-color);box-shadow:0 2px 4px #0000000d;display:flex;justify-content:space-between;padding:1rem 2rem}.nav-brand{color:#4f46e5;color:var(--primary-color);font-size:1.5rem;font-weight:700;text-decoration:none}.nav-links{align-items:center;display:flex;gap:1.5rem}.nav-link{color:#64748b;color:var(--text-light);font-weight:500;text-decoration:none;transition:color .2s}.nav-link:hover{color:#4f46e5;color:var(--primary-color)}.nav-user{color:#1e293b;color:var(--text-dark);font-weight:500}.nav-link-button{background:none;border:none;color:#64748b;color:var(--text-light);cursor:pointer;font-family:inherit;font-size:1rem;font-weight:500;transition:color .2s}.nav-link-button:hover{color:#4f46e5;color:var(--primary-color)}.container{background:#fff;background:var(--card-background);border-radius:16px;box-shadow:0 10px 25px -5px #0000001a,0 10px 10px -5px #0000000a;margin:40px auto;max-width:800px;padding:40px}.welcome-container{background:none;box-shadow:none;text-align:center}.hero-title{color:#1e293b;color:var(--text-dark);font-size:3.5rem;font-weight:800;margin-bottom:1rem}.hero-subtitle{color:#64748b;color:var(--text-light);font-size:1.25rem;margin-bottom:2.5rem;margin-left:auto;margin-right:auto;max-width:600px}.hero-buttons{display:flex;gap:1rem;justify-content:center}.button-primary{background-image:linear-gradient(90deg,#6366f1,#818cf8);border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:1.1rem;font-weight:600;padding:1rem 2rem;text-decoration:none;transition:transform .2s,box-shadow .2s}.button-primary:hover{box-shadow:0 4px 12px #6366f166;transform:translateY(-2px)}.button-primary:disabled{background:#a5b4fc;box-shadow:none;cursor:not-allowed;transform:none}.button-secondary{background-color:#fff;border:2px solid #4f46e5;border:2px solid var(--primary-color);border-radius:8px;color:#4f46e5;color:var(--primary-color);cursor:pointer;font-size:1.1rem;font-weight:600;padding:1rem 2rem;text-decoration:none;transition:background-color .2s,color .2s}.button-secondary:hover{background-color:#eef2ff}.header{margin-bottom:30px;text-align:center}.header h1{color:#1e293b;color:var(--text-dark);font-size:2rem}.header p{color:#64748b;color:var(--text-light)}.quiz-form{gap:20px}.form-group,.quiz-form{display:flex;flex-direction:column}.form-group label{color:#1e293b;color:var(--text-dark);font-weight:500;margin-bottom:8px}.form-group input,.form-group select{background:#f8fafc;border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:8px;font-size:1rem;padding:12px}.form-row{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.auth-container{max-width:500px}.auth-title{color:#1e293b;color:var(--text-dark);font-size:2rem;margin-bottom:20px;text-align:center}.no-spinner::-webkit-inner-spin-button,.no-spinner::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.no-spinner{-moz-appearance:textfield}.quiz-display{border-top:1px solid #e2e8f0;border-top:1px solid var(--border-color);margin-top:40px;padding-top:30px}.quiz-display h2{color:#1e293b;color:var(--text-dark);font-size:1.75rem;margin-bottom:20px}.question-card{background-color:#f1f5f9;background-color:var(--background-color);border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:12px;margin-bottom:20px;padding:20px}.question-card p{font-size:1.2rem;font-weight:600;margin:0 0 15px}.options-container{display:flex;flex-direction:column;gap:10px}.option{background-color:#fff;background-color:var(--card-background);border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:8px;cursor:pointer;font-size:1rem;padding:12px;text-align:left;transition:all .2s;width:100%}.option:hover:not(:disabled){border-color:#4f46e5;border-color:var(--primary-color)}.option:disabled{color:#64748b;color:var(--text-light);cursor:not-allowed}.option.selected{background-color:#e0e7ff;background-color:var(--selected-bg);border-color:#a5b4fc;border-color:var(--selected-border);color:#3730a3;color:var(--selected-text);font-weight:600}.option.correct{background-color:#dcfce7;background-color:var(--success-bg);border-color:#a7f3d0;color:#166534;color:var(--success-text);font-weight:600}.option.incorrect{background-color:#fee2e2;background-color:var(--error-bg);border-color:#fca5a5;color:#991b1b;color:var(--error-text)}.correct-answer-reveal{background-color:#e2e8f0;border-radius:8px;color:#1e293b;color:var(--text-dark);font-weight:500;margin-top:15px;padding:10px}.score-card{background-image:linear-gradient(90deg,#6366f1,#818cf8);border-radius:12px;color:#fff;font-size:1.5rem;font-weight:700;margin-bottom:25px;padding:20px;text-align:center}.short-answer-input{border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:8px;box-sizing:border-box;font-size:1rem;min-height:80px;padding:12px;resize:vertical;width:100%}.message-box{border-radius:8px;margin-top:30px;padding:15px;text-align:center}.error{background-color:#fee2e2;background-color:var(--error-bg);border:1px solid #fca5a5;color:#991b1b;color:var(--error-text)}.loading{color:#64748b;color:var(--text-light);font-size:1.1rem}.history-list{display:flex;flex-direction:column;gap:15px;margin-top:20px}.history-card{align-items:center;background-color:#f1f5f9;background-color:var(--background-color);border:1px solid #e2e8f0;border:1px solid var(--border-color);border-radius:12px;display:flex;justify-content:space-between;padding:20px}.history-topic{color:#1e293b;color:var(--text-dark);font-size:1.2rem;font-weight:600;margin:0}.history-score{color:#4f46e5;color:var(--primary-color);font-size:1.1rem;font-weight:500;margin:0}.history-date{color:#64748b;color:var(--text-light);font-size:.9rem;margin:0}
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