:root{--bg-primary: #000000;--bg-secondary: #1d1d1f;--bg-tertiary: #2d2d2f;--bg-elevated: #3a3a3c;--gradient-subtle: linear-gradient(180deg, #1d1d1f 0%, #000000 100%);--gradient-accent: linear-gradient(135deg, #2997ff 0%, #9d50bb 50%, #6dd5ed 100%);--gradient-glow: radial-gradient(ellipse at center, rgba(41, 151, 255, .15) 0%, transparent 70%);--text-primary: #f5f5f7;--text-secondary: rgba(245, 245, 247, .7);--text-tertiary: rgba(245, 245, 247, .5);--text-quaternary: rgba(245, 245, 247, .3);--accent-primary: #2997ff;--accent-secondary: #0a84ff;--accent-glow: rgba(41, 151, 255, .4);--success: #30d158;--warning: #ffd60a;--error: #ff453a;--border-subtle: rgba(255, 255, 255, .1);--border-default: rgba(255, 255, 255, .15);--border-strong: rgba(255, 255, 255, .25);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-2xl: 28px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-glow: 0 0 40px rgba(41, 151, 255, .2);--transition-fast: .15s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-smooth: .4s cubic-bezier(.25, .1, .25, 1)}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,Inter,sans-serif;font-weight:400;background:var(--bg-primary);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}#root{width:100vw;height:100vh;overflow:hidden}.app{display:flex;flex-direction:column;width:100%;height:100%;background:var(--bg-primary);position:relative;overflow:hidden}.app:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:var(--gradient-glow);pointer-events:none;opacity:.6}.app-header{background:#000c;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border-bottom:1px solid var(--border-subtle);z-index:1000;position:relative}.header-content{max-width:1200px;margin:0 auto;padding:0 32px;height:64px;display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:500;letter-spacing:-.02em;color:var(--text-primary)}.logo-icon{width:32px;height:32px;background:var(--gradient-accent);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:var(--shadow-glow)}.nav-tabs{display:flex;gap:4px;background:#ffffff14;padding:4px;border-radius:var(--radius-lg)}.tab{display:flex;align-items:center;gap:8px;padding:10px 20px;border:none;background:transparent;color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);font-size:.9rem;font-weight:400;letter-spacing:-.01em;position:relative;overflow:hidden}.tab:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,#2997ff33,#9d50bb33);opacity:0;transition:opacity var(--transition-normal)}.tab:hover{color:var(--text-primary)}.tab:hover:before{opacity:1}.tab.active{background:#ffffff1f;color:var(--text-primary);box-shadow:0 2px 12px #0000004d}.tab.active:before{opacity:1;background:linear-gradient(135deg,#2997ff4d,#9d50bb4d)}.tab-icon{display:flex;align-items:center;opacity:.8}.tab.active .tab-icon{opacity:1}.app-main{flex:1;overflow:hidden;margin:16px;border-radius:var(--radius-2xl);background:#1d1d1f99;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border:1px solid var(--border-subtle);box-shadow:var(--shadow-lg);position:relative;transition:all var(--transition-normal)}.app-main:before{content:"";position:absolute;top:-1px;left:20%;right:20%;height:1px;background:linear-gradient(90deg,transparent,rgba(41,151,255,.5),transparent)}.app-footer{background:#000c;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);padding:14px 32px;display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:var(--text-tertiary);border-top:1px solid var(--border-subtle)}.status-indicator{display:flex;align-items:center;gap:8px}.indicator-dot{width:8px;height:8px;background:var(--success);border-radius:50%;animation:pulse 3s ease-in-out infinite;box-shadow:0 0 12px #30d15880}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.6;transform:scale(.85)}}.indicator-text{font-weight:400}.footer-info{opacity:.6}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#fff3;border-radius:3px;transition:all var(--transition-fast)}::-webkit-scrollbar-thumb:hover{background:#ffffff59}.chat-interface{width:100%;height:100%;display:flex;flex-direction:column}.chat-container{flex:1;display:flex;flex-direction:column;overflow:hidden}.messages-container{flex:1;overflow-y:auto;padding:40px;display:flex;flex-direction:column;gap:24px}.welcome-message{flex:1;display:flex;align-items:center;justify-content:center}.welcome-content{text-align:center;max-width:560px;animation:fadeInUp .8s cubic-bezier(.25,.1,.25,1)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.welcome-content h1{font-size:2.25rem;font-weight:600;letter-spacing:-.03em;margin-bottom:16px;background:linear-gradient(135deg,#fff,#fffc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.welcome-content p{color:var(--text-secondary);font-size:1.05rem;margin-bottom:24px}.welcome-content ul{list-style:none;margin:28px 0}.welcome-content li{padding:18px 24px;color:var(--text-secondary);font-size:1rem;transition:all var(--transition-normal);border-radius:var(--radius-md);background:#ffffff08;margin-bottom:10px;border:1px solid transparent}.welcome-content li:hover{background:#ffffff0f;color:var(--text-primary);transform:translate(6px);border-color:var(--border-subtle)}.hint{font-size:.85rem;color:var(--text-quaternary);margin-top:12px}.message{display:flex;gap:14px;max-width:80%;animation:messageIn .4s cubic-bezier(.25,.1,.25,1)}@keyframes messageIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.message.user{margin-left:auto;flex-direction:row-reverse}.message.assistant{margin-right:auto}.message.error .message-content{background:#ff453a26;border:1px solid rgba(255,69,58,.3)}.message-content{padding:16px 20px;border-radius:var(--radius-lg);position:relative;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all var(--transition-normal);line-height:1.6}.message.user .message-content{background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;box-shadow:0 4px 20px #2997ff40}.message.user .message-content:hover{box-shadow:0 8px 32px #2997ff59}.message.assistant .message-content{background:#ffffff14;color:var(--text-primary);border:1px solid var(--border-subtle)}.message.assistant .message-content:hover{background:#ffffff1a;border-color:var(--border-default)}.message-files{display:flex;align-items:center;gap:8px;margin-top:12px;padding:8px 12px;background:#ffffff1a;border-radius:var(--radius-sm);font-size:.8rem}.message-time{display:block;margin-top:10px;font-size:.7rem;opacity:.5}.message.typing .message-content{display:flex;align-items:center;gap:12px}.spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.input-container{padding:24px 32px;border-top:1px solid var(--border-subtle);position:relative;background:#0000004d}.selected-files{margin-bottom:16px;padding:16px 20px;background:#2997ff14;border:1px solid rgba(41,151,255,.2);border-radius:var(--radius-md);animation:slideDown .3s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}.selected-files-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:.85rem;color:var(--text-primary);font-weight:500}.clear-button{display:flex;align-items:center;gap:4px;padding:6px 12px;border:none;background:#ff453a26;color:#ff8a80;border-radius:var(--radius-sm);cursor:pointer;font-size:.75rem;transition:all var(--transition-fast)}.clear-button:hover{background:#ff453a40;transform:translateY(-1px)}.selected-files-list{display:flex;flex-wrap:wrap;gap:8px}.selected-file-tag{display:flex;align-items:center;gap:8px;padding:8px 14px;background:#2997ff26;border:1px solid rgba(41,151,255,.25);border-radius:20px;font-size:.8rem;color:var(--text-primary);transition:all var(--transition-normal)}.selected-file-tag:hover{background:#2997ff33;transform:translateY(-2px);box-shadow:0 4px 12px #2997ff33}.selected-file-tag button{display:flex;align-items:center;justify-content:center;width:16px;height:16px;border:none;background:#ffffff26;border-radius:50%;cursor:pointer;padding:0;color:var(--text-secondary);transition:all var(--transition-fast)}.selected-file-tag button:hover{background:#ffffff40;color:var(--text-primary);transform:scale(1.1)}.input-wrapper{display:flex;gap:12px;align-items:flex-end}.file-selector-button{width:48px;height:48px;border:1px solid var(--border-default);background:#ffffff0d;color:var(--accent-primary);border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-normal);flex-shrink:0;position:relative}.file-selector-button:hover{background:#2997ff1a;border-color:var(--accent-primary);transform:translateY(-2px);box-shadow:0 4px 20px #2997ff33}.file-selector-button span{position:absolute;top:-6px;right:-6px;min-width:18px;height:18px;background:var(--success);color:#fff;border-radius:9px;font-size:.7rem;font-weight:600;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px #30d15866;animation:popIn .3s cubic-bezier(.34,1.56,.64,1)}@keyframes popIn{0%{transform:scale(0)}70%{transform:scale(1.15)}to{transform:scale(1)}}.message-input{flex:1;min-height:48px;max-height:160px;padding:12px 16px;border:1px solid var(--border-default);border-radius:var(--radius-md);font-size:.95rem;resize:none;font-family:inherit;background:#ffffff0d;color:var(--text-primary);transition:all var(--transition-normal)}.message-input:focus{outline:none;border-color:var(--accent-primary);background:#ffffff14;box-shadow:0 0 0 4px #2997ff1a}.message-input::placeholder{color:var(--text-quaternary)}.send-button{width:48px;height:48px;border:none;background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-normal);flex-shrink:0;box-shadow:0 4px 16px #2997ff4d}.send-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px #2997ff66}.send-button:active:not(:disabled){transform:translateY(0)}.send-button:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.file-selector-panel{position:absolute;bottom:100%;left:32px;right:32px;background:#1e1e21fa;border:1px solid var(--border-subtle);border-radius:var(--radius-xl);box-shadow:0 16px 64px #0009;max-height:420px;display:flex;flex-direction:column;z-index:10;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);animation:slideUp .35s cubic-bezier(.25,.1,.25,1);margin-bottom:12px}@keyframes slideUp{0%{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.file-selector-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--border-subtle)}.file-selector-header h3{font-size:1rem;font-weight:500;color:var(--text-primary)}.close-button{width:32px;height:32px;border:none;background:#ffffff14;color:var(--text-secondary);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.close-button:hover{background:#ffffff26;color:var(--text-primary);transform:rotate(90deg)}.file-selector-content{flex:1;overflow-y:auto;padding:16px}.empty-files{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:56px 32px;color:var(--text-tertiary);text-align:center}.empty-files svg{margin-bottom:16px;opacity:.4}.file-selector-list{display:flex;flex-direction:column;gap:6px}.file-selector-item{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);background:#ffffff05}.file-selector-item:hover{background:#2997ff14;border-color:#2997ff33;transform:translate(4px)}.file-selector-item.selected{background:#2997ff1f;border-color:var(--accent-primary)}.file-icon{color:var(--accent-primary);flex-shrink:0}.file-info{flex:1;min-width:0}.file-name{font-weight:500;color:var(--text-primary);margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-meta{display:flex;gap:12px;font-size:.75rem;color:var(--text-tertiary)}.file-category{padding:3px 8px;background:#2997ff26;border-radius:6px;color:var(--accent-primary)}.check-indicator{width:24px;height:24px;background:linear-gradient(135deg,#2997ff,#0a84ff);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 2px 10px #2997ff66;animation:checkPop .3s cubic-bezier(.34,1.56,.64,1)}@keyframes checkPop{0%{transform:scale(0)}70%{transform:scale(1.2)}to{transform:scale(1)}}.file-selector-footer{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-top:1px solid var(--border-subtle);font-size:.85rem;color:var(--text-secondary)}.confirm-button{padding:10px 20px;border:none;background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;border-radius:var(--radius-sm);cursor:pointer;font-weight:500;font-size:.85rem;transition:all var(--transition-normal);box-shadow:0 2px 10px #2997ff4d}.confirm-button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 16px #2997ff66}.confirm-button:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.input-hint{margin-top:10px;font-size:.75rem;color:var(--text-quaternary)}.file-uploader{width:100%;height:100%;display:flex;flex-direction:column}.uploader-container{flex:1;overflow-y:auto;padding:40px}.upload-zone{border:1.5px dashed var(--border-default);border-radius:var(--radius-xl);padding:64px;text-align:center;cursor:pointer;transition:all var(--transition-normal);background:#ffffff03}.upload-zone:hover{border-color:var(--accent-primary);background:#2997ff0a;transform:translateY(-2px)}.upload-zone.dragging{border-color:var(--accent-primary);background:#2997ff14;transform:scale(1.01)}.upload-icon{color:var(--accent-primary);margin-bottom:20px;opacity:.8}.upload-zone h3{font-size:1.35rem;font-weight:500;margin-bottom:10px;color:var(--text-primary)}.upload-zone p{color:var(--text-secondary);margin-bottom:4px}.file-hint{font-size:.8rem;color:var(--text-quaternary)}.hidden-input{display:none}.file-list{margin-top:32px}.file-list-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.file-list-header h3{font-size:1.1rem;font-weight:500;color:var(--text-primary)}.file-item{display:flex;align-items:center;gap:14px;padding:14px 16px;background:#ffffff08;border:1px solid var(--border-subtle);border-radius:var(--radius-md);margin-bottom:10px;transition:all var(--transition-normal)}.file-item:hover{background:#ffffff0f;border-color:#2997ff33;transform:translate(4px)}.file-name{display:block;font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-size{display:block;font-size:.8rem;color:var(--text-tertiary)}.upload-button{width:100%;padding:14px;margin-top:20px;border:none;background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;border-radius:var(--radius-md);cursor:pointer;font-size:.95rem;font-weight:500;display:flex;align-items:center;justify-content:center;gap:8px;transition:all var(--transition-normal);box-shadow:0 4px 16px #2997ff4d}.upload-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 28px #2997ff66}.upload-button:active:not(:disabled){transform:translateY(0)}.upload-result{margin-top:28px;padding:20px;background:#ffffff05;border:1px solid var(--border-subtle);border-radius:var(--radius-lg)}.upload-result h3{font-size:1.1rem;margin-bottom:16px;font-weight:500;color:var(--text-primary)}.result-item{display:flex;align-items:flex-start;gap:14px;padding:14px;background:#ffffff08;border:1px solid var(--border-subtle);border-radius:var(--radius-md);margin-bottom:10px;transition:all var(--transition-normal)}.result-item.success{border-color:#30d15840;background:#30d1580d}.result-item.error{border-color:#ff453a40;background:#ff453a0d}.result-item:hover{transform:translate(4px)}.status-icon{flex-shrink:0;margin-top:2px}.result-item.success .status-icon{color:var(--success)}.result-item.error .status-icon{color:var(--error)}.result-file{display:block;font-weight:500;margin-bottom:4px;color:var(--text-primary)}.result-message{display:block;font-size:.8rem;color:var(--text-secondary)}.continue-button{width:100%;padding:14px;margin-top:20px;border:none;background:#ffffff14;color:var(--accent-primary);border-radius:var(--radius-md);cursor:pointer;font-weight:500;transition:all var(--transition-normal)}.continue-button:hover{background:#2997ff1a;transform:translateY(-2px)}.knowledge-browser{width:100%;height:100%;display:flex;flex-direction:column}.browser-container{flex:1;display:flex;overflow:hidden}.browser-sidebar{width:360px;min-width:300px;border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;overflow:hidden;background:#0003}.search-bar{padding:20px;border-bottom:1px solid var(--border-subtle)}.search-input-wrapper{display:flex;gap:8px}.search-input{flex:1;padding:12px 16px 12px 44px;border:1px solid var(--border-default);border-radius:var(--radius-md);font-size:.9rem;background:#ffffff0d;color:var(--text-primary);transition:all var(--transition-normal)}.search-input::placeholder{color:var(--text-quaternary)}.search-input:focus{outline:none;border-color:var(--accent-primary);background:#ffffff14}.search-button{padding:12px 18px;border:none;background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;border-radius:var(--radius-md);cursor:pointer;font-weight:500;font-size:.85rem;transition:all var(--transition-normal);box-shadow:0 2px 10px #2997ff4d}.search-button:hover{transform:translateY(-1px);box-shadow:0 4px 16px #2997ff66}.category-filter{padding:16px 20px;border-bottom:1px solid var(--border-subtle)}.filter-header{display:flex;align-items:center;gap:8px;font-weight:500;color:var(--text-primary);margin-bottom:12px;font-size:.9rem}.category-options{display:flex;flex-wrap:wrap;gap:6px}.category-option{padding:8px 14px;border:1px solid var(--border-default);background:#ffffff08;border-radius:20px;cursor:pointer;font-size:.8rem;transition:all var(--transition-normal);color:var(--text-secondary)}.category-option:hover{border-color:var(--accent-primary);color:var(--accent-primary);background:#2997ff14}.category-option.active{background:linear-gradient(135deg,#2997ff,#0a84ff);color:#fff;border-color:transparent;box-shadow:0 4px 14px #2997ff4d}.knowledge-list{flex:1;overflow-y:auto}.list-header{display:flex;align-items:center;gap:8px;padding:16px 20px;font-weight:500;color:var(--text-primary);border-bottom:1px solid var(--border-subtle);font-size:.9rem}.loading-state,.empty-state{padding:40px 24px;text-align:center;color:var(--text-tertiary)}.knowledge-item{display:flex;align-items:flex-start;gap:14px;padding:16px 20px;cursor:pointer;transition:all var(--transition-normal);border-bottom:1px solid var(--border-subtle)}.knowledge-item:hover{background:#2997ff0f;transform:translate(4px)}.knowledge-item.active{background:#2997ff1a;border-left:3px solid var(--accent-primary)}.item-content{flex:1;min-width:0}.item-header{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:6px}.item-title{font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.item-category{padding:4px 10px;background:#2997ff26;border-radius:8px;font-size:.7rem;color:var(--accent-primary);flex-shrink:0}.item-preview{font-size:.8rem;color:var(--text-tertiary);margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.item-meta{display:flex;align-items:center;gap:6px;font-size:.7rem;color:var(--text-quaternary)}.item-arrow{color:var(--text-quaternary);flex-shrink:0}.browser-main{flex:1;overflow-y:auto;padding:32px;background:#0003}.knowledge-detail{max-width:800px;margin:0 auto}.detail-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid 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