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#f5c6c6;border-radius:var(--radius-sm);color:var(--error);font-size:13px}.login-btn{padding:12px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);border:none;border-radius:var(--radius-md);font-size:15px;font-weight:600;cursor:pointer;transition:var(--transition)}.login-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px var(--primary-glow)}.login-footer{text-align:center;margin-top:20px;font-size:12px;color:var(--text-muted)}@media(max-width:768px){.login-card{padding:28px 24px;width:90vw}.login-header h1{font-size:20px}.login-header img{width:48px;height:48px}.orb-1{width:200px;height:200px}.orb-2{width:150px;height:150px}.orb-3{width:120px;height:120px}}.sidebar{width:280px;min-width:280px;height:100vh;background:var(--bg-sidebar);border-right:1px solid var(--border-light);display:flex;flex-direction:column}.sidebar-header{padding:20px 16px;border-bottom:1px solid 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textarea::placeholder{color:var(--text-muted)}.send-btn{width:38px;height:38px;min-width:38px;border:none;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}.send-btn:hover:not(:disabled){transform:scale(1.05);box-shadow:0 4px 12px var(--primary-glow)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.stop-btn{width:38px;height:38px;min-width:38px;border:none;border-radius:50%;background:var(--error);color:var(--text-light);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}.stop-btn:hover{transform:scale(1.05);box-shadow:0 4px 12px #e060604d}.chat-toolbar{display:flex;align-items:center;justify-content:space-between;margin-top:10px}.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:10px}.model-select{padding:6px 12px;border:1.5px solid 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var(--border);border-radius:var(--radius-sm);background:var(--bg-input);color:var(--text-secondary);font-size:12px;font-weight:500;cursor:pointer;transition:var(--transition)}.quiz-history-btn:hover{border-color:var(--primary);color:var(--primary)}.quiz-input-section{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 24px;gap:32px}.quiz-welcome{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}.quiz-welcome-icon{opacity:.85;margin-bottom:4px}.quiz-welcome h2{font-size:22px;color:var(--text-primary);font-weight:600}.quiz-welcome p{font-size:14px;color:var(--text-muted)}.quiz-input-wrapper{width:100%;max-width:600px;display:flex;flex-direction:column;gap:12px}.quiz-input-wrapper textarea{width:100%;border:1.5px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-input);padding:14px 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20px;border:none;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);font-size:14px;font-weight:600;cursor:pointer;transition:var(--transition)}.quiz-generate-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 12px var(--primary-glow)}.quiz-generate-btn:disabled{opacity:.4;cursor:not-allowed}.quiz-error{width:100%;max-width:600px;padding:12px 16px;background:#e060601a;border:1px solid rgba(224,96,96,.3);border-radius:var(--radius-md);color:var(--error);font-size:13px}.quiz-loading{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:var(--text-muted)}.quiz-loading-spinner{width:40px;height:40px;border:3px solid var(--border-light);border-top-color:var(--primary);border-radius:50%;animation:quiz-spin .8s linear infinite}@keyframes quiz-spin{to{transform:rotate(360deg)}}.quiz-content{flex:1;display:flex;flex-direction:column;overflow-y:auto}.quiz-score-bar{display:flex;align-items:center;gap:12px;padding:14px 24px;background:var(--bg-card);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:10}.quiz-score-label{font-size:14px;font-weight:600;color:var(--text-secondary)}.quiz-score-value{font-size:20px;font-weight:700;color:var(--primary)}.quiz-new-btn{margin-left:auto;padding:6px 16px;border:1.5px solid var(--primary);border-radius:var(--radius-sm);background:transparent;color:var(--primary);font-size:13px;font-weight:600;cursor:pointer;transition:var(--transition)}.quiz-new-btn:hover{background:var(--primary-glow)}.quiz-questions{flex:1;padding:16px 24px;display:flex;flex-direction:column;gap:16px}.quiz-question-card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-sm)}.quiz-question-header{display:flex;gap:12px;margin-bottom:16px}.quiz-question-number{width:28px;height:28px;min-width:28px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}.quiz-question-text{font-size:15px;font-weight:600;color:var(--text-primary);line-height:1.6;padding-top:2px}.quiz-options{display:flex;flex-direction:column;gap:8px}.quiz-option{display:flex;align-items:center;gap:12px;padding:12px 16px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);background:var(--bg-input)}.quiz-option:hover:not(.correct):not(.wrong){border-color:var(--primary);background:var(--primary-bg)}.quiz-option.selected{border-color:var(--primary);background:var(--primary-bg)}.quiz-option.correct{border-color:var(--success);background:#4ecdc41a;cursor:default}.quiz-option.wrong{border-color:var(--error);background:#e060601a;cursor:default}.quiz-option-label{width:28px;height:28px;min-width:28px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--text-secondary);transition:var(--transition)}.quiz-option.selected .quiz-option-label{background:var(--primary);border-color:var(--primary);color:var(--text-light)}.quiz-option.correct .quiz-option-label{background:var(--success);border-color:var(--success);color:var(--text-light)}.quiz-option.wrong .quiz-option-label{background:var(--error);border-color:var(--error);color:var(--text-light)}.quiz-option-text{flex:1;font-size:14px;color:var(--text-primary);line-height:1.5}.quiz-option-icon{display:flex;align-items:center}.quiz-analysis{margin-top:14px;padding-top:14px;border-top:1px dashed var(--border-light);display:flex;flex-direction:column;gap:8px}.quiz-question-submit{margin-top:14px;display:flex;justify-content:flex-end}.quiz-question-submit-btn{padding:6px 20px;border:none;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);font-size:13px;font-weight:600;cursor:pointer;transition:var(--transition)}.quiz-question-submit-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px var(--primary-glow)}.quiz-analysis-item{display:flex;gap:6px;font-size:13px;line-height:1.6;padding:6px 10px;border-radius:var(--radius-sm)}.quiz-analysis-item.analysis-correct{color:#2a9d8f;background:#4ecdc414}.quiz-analysis-item.analysis-wrong{color:var(--text-secondary);background:#00000005}.analysis-label{font-weight:700;min-width:22px}.analysis-text{flex:1}.quiz-submit-area{display:flex;align-items:center;justify-content:center;gap:20px;padding:20px 24px;background:var(--bg-card);border-top:1px solid var(--border-light);position:sticky;bottom:0}.quiz-submit-btn{padding:10px 40px;border:none;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);font-size:15px;font-weight:700;cursor:pointer;transition:var(--transition)}.quiz-submit-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 12px var(--primary-glow)}.quiz-submit-btn:disabled{opacity:.4;cursor:not-allowed}.quiz-progress{font-size:13px;color:var(--text-muted);font-weight:500}.quiz-generating-hint{display:flex;align-items:center;gap:10px;padding:16px 20px;color:var(--text-muted);font-size:13px}.quiz-generating-spinner{width:16px;height:16px;border:2px solid var(--border-light);border-top-color:var(--primary);border-radius:50%;animation:quiz-spin .8s linear infinite}.quiz-question-card.quiz-question-new{animation:quiz-fade-in .4s ease-out}@keyframes quiz-fade-in{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.quiz-history-section{flex:1;overflow-y:auto;padding:16px 24px}.quiz-history-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:60px 0;color:var(--text-muted);font-size:14px}.quiz-history-list{display:flex;flex-direction:column;gap:8px}.quiz-history-item{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-card);border:1.5px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition)}.quiz-history-item:hover,.quiz-history-item.active{border-color:var(--primary);background:var(--primary-bg)}.quiz-history-item-icon{width:36px;height:36px;min-width:36px;border-radius:var(--radius-sm);background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center}.quiz-history-item-info{flex:1;display:flex;flex-direction:column;gap:4px;min-width:0}.quiz-history-item-title{font-size:14px;font-weight:600;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.quiz-history-item-meta{font-size:12px;color:var(--text-muted)}.quiz-history-item-delete{opacity:0;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:var(--radius-sm);transition:var(--transition);flex-shrink:0}.quiz-history-item:hover .quiz-history-item-delete{opacity:1}.quiz-history-item-delete:hover{color:var(--error);background:#e060601a}@media(max-width:768px){.quiz-assistant .hamburger-btn{display:flex}.quiz-header{padding:12px 16px;gap:8px}.quiz-header h3{font-size:14px}.quiz-input-section{padding:24px 16px}.quiz-welcome h2{font-size:18px}.quiz-welcome p{font-size:13px}.quiz-input-wrapper textarea{font-size:16px}.quiz-questions{padding:12px;gap:12px}.quiz-question-card{padding:16px}.quiz-question-text{font-size:14px}.quiz-option{padding:10px 12px}.quiz-option-text{font-size:13px}.quiz-submit-area{padding:14px 16px;flex-wrap:wrap;gap:10px}.quiz-submit-btn{padding:10px 28px;font-size:14px}.quiz-score-bar{padding:12px 16px;flex-wrap:wrap;gap:8px}.quiz-history-section{padding:12px}.quiz-history-item-delete{opacity:1}.quiz-analysis-item{font-size:12px;padding:4px 8px}.quiz-question-submit-btn{font-size:12px;padding:5px 16px}}@media(max-width:480px){.quiz-questions{padding:8px}.quiz-question-card{padding:12px}.quiz-question-number,.quiz-option-label{width:24px;height:24px;min-width:24px;font-size:12px}.quiz-input-toolbar{flex-direction:column;gap:8px}.quiz-generate-btn{width:100%;justify-content:center}}:root{--primary: #4da8da;--primary-light: #7ec8f0;--primary-dark: #2b8ab8;--primary-bg: #e8f4fd;--primary-glow: rgba(77, 168, 218, .3);--bg-main: #f0f7fc;--bg-sidebar: #e3f0f9;--bg-card: #ffffff;--bg-input: #f5fafe;--bg-hover: #dceef8;--bg-code: #1a2332;--text-primary: #1a2a3a;--text-secondary: #5a7a9a;--text-muted: #8aa8c0;--text-light: #ffffff;--border: #c8ddf0;--border-light: #dce8f4;--success: #4ecdc4;--warning: #f0c060;--error: #e06060;--shadow-sm: 0 1px 3px rgba(43, 138, 184, .08);--shadow-md: 0 4px 12px rgba(43, 138, 184, .12);--shadow-lg: 0 8px 24px rgba(43, 138, 184, .16);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 20px;--transition: .2s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg-main);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased}#root{height:100vh;display:flex}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--primary-light)}input,textarea,select,button{font-family:inherit}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}.sidebar-overlay{display:none}@media(max-width:768px){.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:99;animation:overlay-fade-in .2s ease}@keyframes overlay-fade-in{0%{opacity:0}to{opacity:1}}}