:root{--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-200: #bfdbfe;--primary-300: #93c5fd;--primary-400: #60a5fa;--primary-500: #3b82f6;--primary-600: #2563eb;--primary-700: #1d4ed8;--primary-800: #1e40af;--primary-900: #1e3a8a;--gray-50: #f8fafc;--gray-100: #f1f5f9;--gray-200: #e2e8f0;--gray-300: #cbd5e1;--gray-400: #94a3b8;--gray-500: #64748b;--gray-600: #475569;--gray-700: #334155;--gray-800: #1e293b;--gray-900: #0f172a;--bg: #f8fafc;--surface: #ffffff;--surface-hover: #f8fafc;--text: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--brand: #2563eb;--brand-hover: #1d4ed8;--brand-light: #dbeafe;--border: #e2e8f0;--border-focus: #3b82f6;--success: #10b981;--success-light: #d1fae5;--warning: #f59e0b;--warning-light: #fef3c7;--error: #ef4444;--error-light: #fee2e2;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-sm: .375rem;--radius: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px;--transition-fast: .15s ease;--transition: .2s ease;--transition-slow: .3s ease}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,PingFang SC,Microsoft YaHei,sans-serif;background:linear-gradient(135deg,#f0f4ff,#f8fafc,#f0f9ff);color:var(--text);min-height:100vh;line-height:1.6}.page{width:100%;max-width:1680px;margin:0 auto;padding:var(--space-3) var(--space-5) var(--space-5);display:grid;gap:var(--space-3)}.chat-page{height:100vh;grid-template-rows:auto 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h2{margin:0;font-size:1.35rem;font-weight:700;background:linear-gradient(135deg,var(--primary-700),var(--primary-500));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-controls{display:flex;justify-content:flex-end;gap:var(--space-3);align-items:center;flex-wrap:wrap;margin-left:auto}.auth-controls .user-info{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-4);background:var(--success-light);border:1px solid var(--success);border-radius:var(--radius-full);color:var(--success);font-weight:500}.auth-controls .user-info:before{content:"";width:8px;height:8px;background:var(--success);border-radius:var(--radius-full)}.auth-panel .auth-controls input,.auth-panel .auth-controls .primary,.auth-panel .auth-controls input+input+button,.auth-panel .auth-controls 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var(--border);border-radius:var(--radius-full);background:#fff;color:var(--text-secondary);font-size:1.25rem;line-height:1}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2);padding:var(--space-1);margin-bottom:var(--space-4);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--gray-50)}.auth-tabs button{border:none;background:transparent;color:var(--text-secondary)}.auth-tabs button.active{background:#fff;color:var(--primary-700);box-shadow:var(--shadow-sm)}.auth-form,.auth-form label,.auth-mock-box{display:flex;flex-direction:column;gap:var(--space-3)}.auth-form label span{color:var(--text-secondary);font-size:.86rem;font-weight:600}.auth-submit,.dingtalk-login-button{width:100%}.auth-divider{display:flex;align-items:center;gap:var(--space-3);margin:var(--space-4) 0;color:var(--text-muted);font-size:.85rem}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.dingtalk-login-button{border-color:#8fd4ff;background:#eaf7ff;color:#0877c9}.dingtalk-login-button:hover:not(:disabled){border-color:#38bdf8;background:#dff3ff}.auth-mock-box{margin-top:var(--space-3);padding:var(--space-3);border:1px dashed var(--border);border-radius:var(--radius-md);background:var(--gray-50)}.auth-text-button{width:100%;margin-top:var(--space-3);border:none;background:transparent;color:var(--primary-700)}.auth-notice,.auth-inline-error{padding:var(--space-2) var(--space-3);border-radius:var(--radius);font-size:.88rem}.auth-notice{border:1px solid var(--success);background:var(--success-light);color:#047857}.auth-inline-error{border:1px solid var(--error);background:var(--error-light);color:#b91c1c}.chat-layout{display:grid;grid-template-columns:300px 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.55rem;border-radius:8px;background:#111827f5;color:#fff;font-size:.78rem;line-height:1;white-space:nowrap;opacity:0;pointer-events:none;transform:translate(-50%,-2px);transition:opacity .16s ease,transform .16s ease}.session-collapse:hover:after,.session-restore:hover:after{opacity:1;transform:translate(-50%)}.session-list{display:flex;flex-direction:column;gap:var(--space-1);overflow-y:auto;flex:1;min-height:0;padding-right:var(--space-2)}.session-list::-webkit-scrollbar{width:4px}.session-list::-webkit-scrollbar-track{background:transparent}.session-list::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:var(--radius-full)}.session-group{display:flex;flex-direction:column;gap:.12rem}.session-group+.session-group{margin-top:var(--space-3)}.session-group-label{padding:.08rem var(--space-2) .22rem;color:var(--text-muted);font-size:.74rem;font-weight:800;line-height:1.2}.session-item-wrap{display:grid;grid-template-columns:minmax(0,1fr) 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var(--primary-200);font-size:.78rem;line-height:1.4;font-weight:700;vertical-align:baseline}.citation-link:hover{background:var(--primary-600);color:#fff;transform:none;box-shadow:none}.markdown-link{color:var(--primary-700);font-weight:700;text-decoration:none;border-bottom:1px solid var(--primary-300)}.markdown-link:hover{color:var(--primary-900);border-bottom-color:var(--primary-700)}.input-panel{position:sticky;bottom:var(--space-4);z-index:30;display:flex;flex-direction:column;gap:var(--space-2);background:var(--surface);border:1px solid var(--border);padding:var(--space-2);box-shadow:0 18px 40px #0f172a29}.input-wrapper{position:relative}.input-send-button{position:absolute;right:14px;bottom:14px;z-index:3;display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border:none;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-500),var(--primary-600));color:#fff;box-shadow:0 8px 18px #2563eb47}.input-send-button span{display:block;position:relative;width:18px;height:22px;overflow:hidden;color:transparent;font-size:0;line-height:1}.input-send-button span:before,.input-send-button span:after{content:"";position:absolute;left:50%;display:block}.input-send-button span:before{bottom:2px;width:2.4px;height:17px;border-radius:var(--radius-full);background:#fff;transform:translate(-50%)}.input-send-button span:after{top:1px;width:13px;height:13px;border-top:2.4px solid white;border-left:2.4px solid white;border-radius:1px 0 0;transform:translate(-50%) rotate(45deg);transform-origin:center}.input-send-button:hover:not(:disabled){background:linear-gradient(135deg,var(--primary-600),var(--primary-700));transform:translateY(-1px);box-shadow:0 10px 22px 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var(--transition)}.source-block:hover{box-shadow:var(--shadow-md);border-color:var(--primary-200)}.source-block h4{margin:0 0 var(--space-4);font-size:.9375rem;font-weight:600;color:var(--text);display:flex;align-items:center;gap:var(--space-2)}.source-block h4:before{content:"";width:4px;height:16px;background:var(--primary-500);border-radius:var(--radius-full)}.source-item{background:var(--gray-50);border:1px solid var(--border);padding:var(--space-3);border-radius:var(--radius);margin-bottom:var(--space-3);transition:all var(--transition-fast);scroll-margin:var(--space-8)}.source-item:hover{background:var(--surface);border-color:var(--primary-200);box-shadow:var(--shadow-sm)}.source-item:last-child{margin-bottom:0}.source-item.highlight{background:var(--warning-light);border-color:var(--warning);box-shadow:0 0 0 3px #f59e0b29}.kb-upload-results{display:grid;gap:var(--space-2);margin-top:var(--space-4)}.kb-upload-result{display:grid;gap:2px;padding:var(--space-3);border:1px solid 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var(--primary-100)}select:disabled,input:disabled{background:var(--gray-100);color:var(--text-muted);cursor:not-allowed}button{border:none;border-radius:var(--radius);padding:var(--space-2) var(--space-4);font:inherit;font-size:.875rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);display:inline-flex;align-items:center;justify-content:center;gap:var(--space-1)}button:disabled{opacity:.5;cursor:not-allowed}button.primary{background:linear-gradient(135deg,var(--primary-600),var(--primary-500));color:#fff;box-shadow:var(--shadow)}button.primary:hover:not(:disabled){background:linear-gradient(135deg,var(--primary-700),var(--primary-600));box-shadow:var(--shadow-md);transform:translateY(-1px)}button.primary:active:not(:disabled){transform:translateY(0);box-shadow:var(--shadow)}button.secondary{background:var(--gray-100);color:var(--text);border:1px solid var(--border)}button.secondary:hover:not(:disabled){background:var(--gray-200);border-color:var(--gray-300)}button.danger{background:var(--error-light);color:var(--error);border:1px solid var(--error)}button.danger:hover:not(:disabled){background:var(--error);color:#fff}.error-text{color:var(--error);font-size:.875rem;font-weight:500;padding:var(--space-2) var(--space-3);background:var(--error-light);border-radius:var(--radius);border:1px solid var(--error)}.hint-text{color:var(--text-secondary);font-size:.8125rem;display:flex;align-items:center;gap:var(--space-1)}.hint-text:before{content:""}.loading-spinner{display:inline-flex;align-items:center;gap:var(--space-2)}.loading-spinner:after{content:"";width:16px;height:16px;border:2px solid var(--border);border-top-color:var(--primary-500);border-radius:var(--radius-full);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.code-debug-panel{background:var(--gray-50);border:1px solid 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var(--transition-fast)}.code-debug-toggle:hover:not(:disabled){background:var(--gray-50);border-color:var(--gray-300)}.code-debug-toggle.active{background:var(--primary-50);border-color:var(--primary-400);color:var(--primary-600)}.code-debug-toggle:disabled{opacity:.5;cursor:not-allowed}.code-debug-icon{font-size:.875rem}.suggested-actions{margin-top:var(--space-3);display:flex;flex-wrap:wrap;gap:var(--space-2)}.suggested-action-btn{min-height:34px;padding:var(--space-2) var(--space-3);background:#fff;color:var(--primary-700);border:1px solid var(--primary-200);border-radius:var(--radius);font-size:.875rem;font-weight:500;line-height:1.2;cursor:pointer;transition:all var(--transition-fast)}.suggested-action-btn:hover:not(:disabled){background:var(--primary-50);border-color:var(--primary-400);transform:translateY(-1px)}.suggested-action-btn.needs-confirmation:after{content:"确认";margin-left:var(--space-2);padding:1px 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var(--space-4);background:var(--primary-600);color:#fff;border:none;border-radius:var(--radius);font-size:.875rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.course-switch-primary:hover{background:var(--primary-700)}.course-switch-secondary{padding:var(--space-2) var(--space-4);background:#fff;color:var(--gray-700);border:1px solid var(--border);border-radius:var(--radius);font-size:.875rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.course-switch-secondary:hover{background:var(--gray-50);border-color:var(--gray-300)}.empty-state{display:grid;align-content:center;gap:0;justify-items:center;min-height:min(620px,calc(100dvh - 260px));text-align:center;padding:clamp(8rem,17vh,12rem) var(--space-10) var(--space-10);color:var(--text-muted)}.empty-state>div:not(.empty-question-grid){order:1;margin:0;font-size:.98rem;color:var(--text-muted)}.empty-question-grid{order:2;display:grid;grid-template-columns:repeat(2,minmax(220px,1fr));column-gap:var(--space-4);row-gap:var(--space-6);margin-top:2.25rem;width:min(820px,100%)}.empty-question-card{width:100%;min-height:64px;padding:.95rem 1.15rem;border:1px solid rgb(191 219 254 / .9);border-radius:18px;background:linear-gradient(135deg,#eff6fff5,#fffffffa);color:var(--text);box-shadow:0 16px 36px #2563eb1a;font-size:.95rem;font-weight:400;line-height:1.55;text-align:left;cursor:pointer;transition:transform var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}.empty-question-card:hover:not(:disabled){border-color:var(--primary-300);box-shadow:0 16px 34px #2563eb24;transform:translateY(-1px)}.empty-question-card:disabled{cursor:not-allowed;opacity:.62}.empty-state-icon{font-size:3rem;margin-bottom:var(--space-4);opacity:.5}@media (max-width: 1024px){.sources{grid-template-columns:repeat(2,1fr)}}@media (max-width: 768px){.page{padding:var(--space-4);gap:var(--space-4)}.page.chat-page{height:100dvh;min-height:100dvh;padding:var(--space-2);gap:var(--space-2);overflow:hidden}.auth-panel{min-height:58px;display:grid;grid-template-columns:36px minmax(0,1fr) auto;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);overflow:hidden}.brand-header{justify-content:center;min-width:0}.brand-header h2{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:1.05rem}.brand-logo{width:34px;height:34px}.mobile-session-toggle{display:inline-grid;place-items:center;gap:2px;width:32px;height:32px;padding:0;border:none;background:transparent;color:var(--text)}.mobile-session-toggle span{width:17px;height:2px;border-radius:var(--radius-full);background:currentColor}.auth-controls{justify-content:flex-end;margin-left:0;grid-column:3;min-width:0}.chat-layout{grid-template-columns:1fr;min-height:0;overflow:hidden}.main-chat{min-height:0;gap:var(--space-2)}.messages-container{min-height:140px;padding:var(--space-2)}.session-panel{display:none;max-height:none}.chat-layout.session-mobile-open .session-panel{position:fixed;inset:var(--space-2) auto var(--space-2) var(--space-2);z-index:80;display:flex;width:min(86vw,340px);min-height:0;max-height:calc(100dvh - 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3.4rem;resize:none}.input-send-button{right:12px;bottom:12px;width:42px;height:42px}.mobile-course-toggle{bottom:12px;height:42px}.mobile-course-popover{right:12px;width:auto}.input-tools{display:grid;grid-template-columns:1fr;align-items:stretch;gap:var(--space-2)}.skill-selector{display:grid;grid-template-columns:4.5rem minmax(0,1fr);align-items:center}.skill-selector select{width:100%;min-width:0}.web-search-toggle,.code-debug-toggle{justify-content:center}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--gray-100);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}.kb-admin-page{max-width:1380px}.kb-admin-hero{display:grid;grid-template-columns:minmax(0,1.5fr) auto;gap:var(--space-5);align-items:end;border:none;color:#fff;background:radial-gradient(circle at top right,rgb(255 255 255 / .18),transparent 26%),linear-gradient(135deg,#11317a,#2154c8 45%,#1b77c4)}.kb-admin-hero-copy{display:grid;gap:var(--space-3)}.kb-admin-eyebrow{width:fit-content;padding:.35rem .75rem;border-radius:var(--radius-full);background:#ffffff24;border:1px solid rgb(255 255 255 / .2);font-size:.75rem;letter-spacing:.08em;text-transform:uppercase}.kb-admin-hero h2{margin:0;font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.1}.kb-admin-hero p{margin:0;max-width:66ch;color:#ffffffe6}.kb-admin-stats{display:grid;grid-template-columns:repeat(3,minmax(92px,1fr));gap:var(--space-3)}.kb-admin-stat{display:grid;gap:var(--space-1);min-width:92px;padding:var(--space-4);border-radius:var(--radius-lg);background:#ffffff1f;border:1px solid rgb(255 255 255 / .18);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.kb-admin-stat strong{font-size:1.35rem;line-height:1}.kb-admin-stat span{color:#fffc;font-size:.82rem}.kb-admin-shell{display:grid;grid-template-columns:minmax(290px,340px) 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