.question-card{max-width:800px;margin:0 auto;padding:2rem;background:#1f2937;border-radius:12px;box-shadow:0 4px 6px #0000004d;color:#e5e7eb;border:1px solid #374151}.question-card.loading{display:flex;justify-content:center;align-items:center;min-height:400px}.loading-spinner{font-size:1.2rem;color:#9ca3af}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid #374151}.question-header h2{margin:0;font-size:1.5rem;color:#e5e7eb}.correct-count{background:#10b981;color:#fff;padding:.5rem 1rem;border-radius:20px;font-size:.875rem;font-weight:500}.question-content{margin-bottom:2rem}.question-title{font-size:1.125rem;line-height:1.75;color:#e5e7eb;margin:0;white-space:pre-wrap}.options{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}.option{display:flex;align-items:flex-start;padding:1rem 1.25rem;background:#374151;border:2px solid #4b5563;border-radius:8px;cursor:pointer;transition:all .2s;text-align:left;font-size:1rem;color:#e5e7eb}.option:hover:not(:disabled){background:#4b5563;border-color:#6b7280}.option.selected{background:#2563eb!important;border-color:#3b82f6!important;color:#dbeafe!important}.option.selected:hover:not(:disabled){background:#1d4ed8!important;border-color:#2563eb!important}.option.correct{background:#064e3b;border-color:#10b981;color:#d1fae5}.option.wrong{background:#7f1d1d;border-color:#ef4444;color:#fee2e2}.option.should-select{background:#78350f;border-color:#f59e0b;color:#fef3c7}.option:disabled{cursor:not-allowed;opacity:.8}.option-label{font-weight:600;margin-right:.75rem;min-width:1.5rem}.option-text{flex:1;color:inherit}.message{padding:1rem;border-radius:8px;margin-bottom:1.5rem;font-size:1rem}.message.success{background:#064e3b;color:#d1fae5;border:1px solid #10b981}.message.error{background:#7f1d1d;color:#fee2e2;border:1px solid #ef4444}.actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:1rem}.btn-primary,.btn-secondary{padding:.75rem 2rem;border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s;flex:1;max-width:200px}.btn-primary{background:#4b5563;color:#fff}.btn-primary:hover:not(:disabled){background:#6b7280}.btn-primary:disabled{background:#9ca3af;cursor:not-allowed}.btn-secondary{background:#4b5563;color:#fff}.btn-secondary:hover{background:#6b7280}.auto-submit-note{padding:.75rem 1rem;background:#374151;border-radius:8px;color:#9ca3af;font-size:.875rem}.no-question{text-align:center;padding:3rem}.no-question p{font-size:1.125rem;color:#9ca3af;margin-bottom:1.5rem}@media (max-width: 640px){.question-card{padding:1.5rem}.question-header{flex-direction:column;align-items:flex-start;gap:1rem}.actions{flex-direction:row;justify-content:center}.btn-primary,.btn-secondary{flex:1;min-width:120px}}.auth-container{display:flex;justify-content:center;align-items:center;min-height:60vh;padding:2rem}.auth-card{width:100%;max-width:400px;padding:2.5rem;background:#1f2937;border-radius:12px;box-shadow:0 4px 6px #0000004d;border:1px solid #374151}.auth-card h2{margin:0 0 2rem;font-size:1.875rem;color:#e5e7eb;text-align:center}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;font-size:.875rem;font-weight:500;color:#d1d5db}.form-group input{width:100%;padding:.75rem 1rem;background:#374151;border:1px solid #4b5563;border-radius:8px;font-size:1rem;color:#e5e7eb;transition:all .2s}.form-group input:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f61a}.form-group input::placeholder{color:#9ca3af}.auth-message{padding:.75rem 1rem;border-radius:8px;margin-bottom:1rem;font-size:.875rem;text-align:center}.auth-message.success{background:#064e3b;color:#d1fae5;border:1px solid #10b981}.auth-message.error{background:#7f1d1d;color:#fee2e2;border:1px solid #ef4444}.auth-card .btn-primary{width:100%;margin-top:.5rem;padding:.75rem 2rem;background:#4b5563;color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s;text-align:center!important;display:block;flex:none;max-width:none}.auth-card .btn-primary:hover:not(:disabled){background:#6b7280}.auth-card .btn-primary:disabled{background:#9ca3af;cursor:not-allowed;opacity:.7}.auth-switch{margin-top:1.5rem;text-align:center;font-size:.875rem;color:#9ca3af}.link-button{background:none;border:none;color:#3b82f6;cursor:pointer;font-size:.875rem;text-decoration:underline;padding:0;margin-left:.25rem}.link-button:hover{color:#60a5fa}@media (max-width: 640px){.auth-card{padding:2rem 1.5rem}}.app{min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);color:#e5e7eb}.app-header{text-align:center;padding:60px 20px 40px}.app-header h1{font-size:3rem;margin:0 0 10px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.app-header p{font-size:1.2rem;opacity:.9;margin:0}.user-info-top{position:fixed;top:1rem;left:1rem;display:flex;align-items:center;gap:.75rem;z-index:100}.username{font-size:.875rem;color:#e5e7ebb3}.btn-logout-small{padding:.375rem .75rem;background:#ef444426;border:1px solid rgba(239,68,68,.3);color:#fee2e2;border-radius:6px;cursor:pointer;font-size:.75rem;transition:all .2s}.btn-logout-small:hover{background:#ef444440;border-color:#ef444480}.app-main{max-width:1200px;margin:0 auto;padding:60px 20px 40px 200px}.feature-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px;margin-bottom:50px}.card{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:16px;padding:30px;border:1px solid rgba(255,255,255,.2);transition:transform .3s ease,box-shadow .3s ease}.card:hover{transform:translateY(-5px);box-shadow:0 10px 30px #0000004d}.card h2{font-size:1.5rem;margin:0 0 15px;color:#fff}.card p{font-size:1rem;opacity:.9;margin:0;line-height:1.6}.demo-section{text-align:center;padding:40px 20px}.demo-section button{background:#fff3;border:2px solid rgba(255,255,255,.3);color:#fff;padding:15px 40px;font-size:1.1rem;border-radius:50px;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.demo-section button:hover{background:#ffffff4d;border-color:#ffffff80;transform:scale(1.05)}@media (max-width: 768px){.app-header h1{font-size:2rem}.feature-cards{grid-template-columns:1fr}.app-main{padding:60px 20px 40px}}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}#root{width:100%;min-height:100vh}