:root{--bg-primary: #1a1a1a;--bg-secondary: #2a2a2a;--bg-tertiary: #3a3a3a;--bg-chat: #212121;--bg-input: #2f2f2f;--bg-hover: #3f3f3f;--text-primary: #f5f5f5;--text-secondary: #a0a0a0;--text-tertiary: #6b6b6b;--accent-primary: #6366f1;--accent-secondary: #8b5cf6;--accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);--border-color: #3a3a3a;--border-radius: 12px;--border-radius-sm: 8px;--border-radius-lg: 16px;--sidebar-width: 260px;--header-height: 56px;--input-height: 52px;--font-sans: "Noto Sans TC", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;--shadow-sm: 0 1px 2px rgba(0,0,0,.3);--shadow-md: 0 4px 12px rgba(0,0,0,.4);--shadow-lg: 0 8px 24px rgba(0,0,0,.5);--transition-fast: .15s ease;--transition-normal: .25s ease}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f7f7f8;--bg-tertiary: #ececec;--bg-chat: #ffffff;--bg-input: #f0f0f0;--bg-hover: #e5e5e5;--text-primary: #1a1a1a;--text-secondary: #666666;--text-tertiary: #999999;--border-color: #e0e0e0;--shadow-sm: 0 1px 2px rgba(0,0,0,.1);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--shadow-lg: 0 8px 24px rgba(0,0,0,.15)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%}body{font-family:var(--font-sans);font-size:15px;line-height:1.6;color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}.app{display:flex;height:100%;width:100%}.sidebar{width:var(--sidebar-width);height:100%;background:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:transform var(--transition-normal)}.sidebar-header{padding:16px;border-bottom:1px solid var(--border-color)}.new-chat-btn{width:100%;padding:12px 16px;background:var(--accent-gradient);color:#fff;border:none;border-radius:var(--border-radius);font-size:14px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:opacity var(--transition-fast),transform var(--transition-fast)}.new-chat-btn:hover{opacity:.9}.new-chat-btn:active{transform:scale(.98)}.chat-list{flex:1;overflow-y:auto;padding:8px}.chat-item{padding:12px 16px;border-radius:var(--border-radius-sm);cursor:pointer;transition:background var(--transition-fast);margin-bottom:2px}.chat-item:hover{background:var(--bg-hover)}.chat-item.active{background:var(--bg-tertiary)}.chat-item-title{font-size:14px;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-item-date{font-size:12px;color:var(--text-tertiary);margin-top:4px}.sidebar-footer{padding:16px;border-top:1px solid var(--border-color)}.user-info{display:flex;align-items:center;gap:12px;padding:8px;border-radius:var(--border-radius-sm);cursor:pointer;transition:background var(--transition-fast)}.user-info:hover{background:var(--bg-hover)}.user-avatar{width:36px;height:36px;border-radius:50%;background:var(--accent-gradient);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:14px}.user-name{font-size:14px;font-weight:500}.main{flex:1;display:flex;flex-direction:column;height:100%;overflow:hidden}.header{height:var(--header-height);padding:0 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border-color);background:var(--bg-primary)}.header-title{font-size:16px;font-weight:500}.header-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;border:none;background:transparent;border-radius:var(--border-radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:background var(--transition-fast),color var(--transition-fast)}.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.chat-area{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column}.messages{max-width:800px;width:100%;margin:0 auto;display:flex;flex-direction:column;gap:24px}.message{display:flex;gap:16px;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:14px}.message.user .message-avatar{background:var(--bg-tertiary);color:var(--text-primary)}.message.assistant .message-avatar{background:var(--accent-gradient);color:#fff}.message-content{flex:1;min-width:0}.particle-info{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}.cognitive-mode-tag{display:inline-block;font-size:11px;font-weight:500;padding:2px 8px;border-radius:12px;background:var(--bg-tertiary);color:var(--text-secondary);border:1px solid var(--border-color)}.simhash-tag{display:inline-block;font-size:10px;font-family:var(--font-mono);padding:2px 6px;border-radius:8px;background:var(--bg-secondary);color:var(--text-tertiary);border:1px solid var(--border-color);cursor:help}.message-text{font-size:15px;line-height:1.7;color:var(--text-primary)}.message-text p{margin-bottom:12px}.message-text p:last-child{margin-bottom:0}.message-text code{font-family:var(--font-mono);font-size:13px;background:var(--bg-tertiary);padding:2px 6px;border-radius:4px}.message-text pre{background:var(--bg-secondary);border-radius:var(--border-radius-sm);padding:16px;overflow-x:auto;margin:12px 0}.message-text pre code{background:transparent;padding:0}.welcome{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px}.welcome-logo{width:64px;height:64px;background:var(--accent-gradient);border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:24px}.welcome-logo svg{width:32px;height:32px;fill:#fff}.welcome-title{font-size:28px;font-weight:600;margin-bottom:12px}.welcome-subtitle{font-size:16px;color:var(--text-secondary);max-width:400px}.input-area{padding:16px 20px 24px;background:var(--bg-primary)}.input-container{max-width:800px;margin:0 auto;position:relative}.input-wrapper{display:flex;align-items:flex-end;gap:12px;background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);padding:12px 16px;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.input-wrapper:focus-within{border-color:var(--accent-primary);box-shadow:0 0 0 2px #6366f133}.input-textarea{flex:1;background:transparent;border:none;outline:none;font-family:var(--font-sans);font-size:15px;line-height:1.5;color:var(--text-primary);resize:none;min-height:24px;max-height:200px}.input-textarea::placeholder{color:var(--text-tertiary)}.send-btn{width:36px;height:36px;border:none;background:var(--accent-gradient);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;transition:opacity var(--transition-fast),transform var(--transition-fast)}.send-btn:hover{opacity:.9}.send-btn:active{transform:scale(.95)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.send-btn svg{width:18px;height:18px}.typing-indicator{display:flex;gap:4px;padding:8px 0}.typing-indicator span{width:8px;height:8px;background:var(--text-tertiary);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}@media (max-width: 768px){.sidebar{position:fixed;left:0;top:0;z-index:100;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:99;opacity:0;visibility:hidden;transition:opacity var(--transition-normal)}.sidebar-overlay.visible{opacity:1;visibility:visible}.messages{padding:0 8px}.input-area{padding:12px 16px 20px}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}