*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4a90e2;--primary-hover: #357abd;--secondary-color: #f5f5f5;--text-color: #333;--border-color: #ddd;--error-color: #e74c3c;--success-color: #27ae60;--shadow: 0 2px 8px rgba(0, 0, 0, .1);--border-radius: 8px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;line-height:1.6;color:var(--text-color);background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}.app{min-height:100vh;padding:20px;display:flex;align-items:center;justify-content:center}.page-container{width:100%;max-width:800px;margin:0 auto}.content-box{background:#fff;border-radius:var(--border-radius);padding:40px;box-shadow:var(--shadow)}h1{font-size:28px;margin-bottom:10px;color:var(--text-color)}h2{font-size:20px;margin:20px 0 15px;color:var(--text-color)}h3{font-size:18px;margin:15px 0 10px}.subtitle{color:#666;margin-bottom:30px;font-size:16px}.required{color:var(--error-color);margin-left:4px}button{font-family:inherit;cursor:pointer;border:none;border-radius:var(--border-radius);font-size:16px;transition:all .3s ease}.primary-button{background:var(--primary-color);color:#fff;padding:12px 32px;font-weight:500;width:100%;margin-top:20px}.primary-button:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 4px 12px #4a90e24d}.primary-button:disabled{background:#ccc;cursor:not-allowed}.consent-content{margin:30px 0;line-height:1.8}.consent-content ul{margin:15px 0;padding-left:30px}.consent-content li{margin:8px 0}.consent-checkbox{margin:30px 0;padding:20px;background:var(--secondary-color);border-radius:var(--border-radius)}.consent-checkbox label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:16px}.consent-checkbox input[type=checkbox]{width:20px;height:20px;cursor:pointer}.question-text{font-weight:500;margin-bottom:15px;font-size:16px}.likert7-item,.radio-group,.number-input{margin:30px 0;padding:20px;background:var(--secondary-color);border-radius:var(--border-radius)}.likert7-scale{display:flex;align-items:center;gap:15px;margin-top:15px}.scale-label{font-size:14px;color:#666;min-width:80px}.scale-options{display:flex;gap:10px;flex:1;justify-content:space-between}.scale-option{display:flex;flex-direction:column;align-items:center;cursor:pointer}.scale-option input[type=radio]{width:18px;height:18px;cursor:pointer;margin-bottom:5px}.scale-number{font-size:14px;font-weight:500}.radio-options{display:flex;flex-direction:column;gap:12px;margin-top:10px}.radio-option{display:flex;align-items:center;gap:10px;cursor:pointer;padding:10px;border-radius:6px;transition:background .2s}.radio-option:hover{background:#fff}.radio-option input[type=radio]{width:18px;height:18px;cursor:pointer}.number-field{width:100%;padding:10px;border:1px solid var(--border-color);border-radius:6px;font-size:16px;margin-top:10px}.section-divider{margin:40px 0 20px;padding-top:30px;border-top:2px solid var(--border-color)}.chat-interface{position:relative}.experiment-header{margin-bottom:30px;text-align:center}.chat-messages{min-height:200px;max-height:400px;overflow-y:auto;margin-bottom:20px;padding:20px;background:var(--secondary-color);border-radius:var(--border-radius)}.robot-message{display:flex;justify-content:flex-start;margin-bottom:15px}.user-message{display:flex;justify-content:flex-end;margin-bottom:15px}.message-bubble{background:#fff;padding:15px 20px;border-radius:18px;max-width:80%;box-shadow:0 1px 2px #0000001a}.user-bubble{background:var(--primary-color);color:#fff}.user-bubble.sent{background:#e0e0e0;color:#666}.message-bubble p{margin:0;line-height:1.6}.user-opening-section{text-align:center}.start-dialog-button{margin-top:20px}.skip-button{background:#f0f0f0;color:#666;padding:8px 16px;font-size:14px;margin-bottom:15px}.skip-button:hover{background:#e0e0e0}.options-container{margin-top:20px}.options-prompt{font-weight:500;margin-bottom:15px;color:#666}.option-button{display:block;width:100%;background:#fff;border:2px solid var(--border-color);padding:15px;margin-bottom:10px;text-align:left;font-size:15px;color:var(--text-color)}.option-button:hover:not(:disabled){border-color:var(--primary-color);background:#f8f9ff;transform:translate(5px)}.option-button:disabled{opacity:.5;cursor:not-allowed}.round-complete-section{margin-top:30px;text-align:center}.round-complete{text-align:center;padding:20px;background:var(--success-color);color:#fff;border-radius:var(--border-radius);margin-bottom:20px;font-size:16px}.continue-button{margin-top:10px;max-width:300px;margin-left:auto;margin-right:auto}.progress-indicator{text-align:center;margin-top:20px;color:#666;font-size:14px}.completion-message{margin:30px 0;padding:20px;background:#e8f5e9;border-radius:var(--border-radius);text-align:center}.participant-id-box{margin:30px 0;padding:25px;background:var(--secondary-color);border-radius:var(--border-radius);text-align:center}.id-label{font-weight:500;margin-bottom:10px;color:#666}.id-display{display:flex;align-items:center;justify-content:center;gap:15px;margin:15px 0}.id-display code{background:#fff;padding:12px 20px;border-radius:6px;font-size:18px;font-family:Courier New,monospace;color:var(--primary-color);font-weight:600;border:2px dashed var(--border-color)}.copy-button{background:var(--primary-color);color:#fff;padding:8px 16px;font-size:14px}.copy-button:hover{background:var(--primary-hover)}.id-note{font-size:14px;color:#999;margin-top:10px}.submit-button{margin-top:30px}.success-message{margin-top:30px;padding:20px;background:var(--success-color);color:#fff;border-radius:var(--border-radius);text-align:center}.success-message p{margin:5px 0}.footer-note{margin-top:30px;text-align:center;color:#999;font-size:14px}@media (max-width: 768px){.content-box{padding:20px}h1{font-size:24px}.likert7-scale{flex-direction:column;align-items:stretch}.scale-label{min-width:auto;text-align:center}.scale-options{justify-content:center}.message-bubble{max-width:90%}}.submitting-message{margin:30px 0;padding:30px;background:var(--secondary-color);border-radius:var(--border-radius);text-align:center}.loading-spinner{width:40px;height:40px;margin:0 auto 15px;border:4px solid #f3f3f3;border-top:4px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-message{margin:30px 0;padding:20px;background:#ffebee;border-left:4px solid var(--error-color);border-radius:var(--border-radius);text-align:center}.error-message p{margin:5px 0}.error-detail{font-size:14px;color:#666;margin-top:10px}.retry-button{margin-top:20px;max-width:300px;margin-left:auto;margin-right:auto;display:block}.error-recovery{margin-top:20px;background:#fff3e0;border-left:4px solid #ff9800}.error-recovery .id-note{margin-top:15px;font-size:14px;color:#666}.error-recovery .id-note code{background:#fff;padding:4px 8px;border-radius:4px;font-family:Courier New,monospace;color:var(--primary-color);font-weight:600}.footer-contact{font-size:14px;color:#999;margin-top:10px}