:root{--color-bg: #111827;--color-surface: #1f2937;--color-surface-hover: #374151;--color-border: #374151;--color-text: #f3f4f6;--color-text-muted: #9ca3af;--color-primary: #6366f1;--color-primary-hover: #818cf8;--color-success: #22c55e;--color-warning: #f59e0b;--color-danger: #ef4444;--color-code-bg: #0d1117;--sidebar-width: 260px;--header-height: 48px;--input-height: 60px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--color-bg);color:var(--color-text);font-size:14px;line-height:1.5}button{cursor:pointer;font-family:inherit;font-size:inherit}input,textarea{font-family:inherit;font-size:inherit;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:8px 12px;outline:none}input:focus,textarea:focus{border-color:var(--color-primary)}.app-layout{display:flex;height:100%}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:12px 16px;font-size:15px;font-weight:600;border-bottom:1px solid var(--color-border);display:flex;align-items:center;gap:8px;color:var(--color-primary)}.sidebar-header .logo{font-size:20px}.project-list{flex:1;overflow-y:auto;padding:8px}.project-item{padding:10px 12px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:8px;font-size:13px;color:var(--color-text-muted);transition:all .15s}.project-item:hover{background:var(--color-surface-hover);color:var(--color-text)}.project-item.active{background:#6366f126;color:var(--color-primary)}.project-item .icon{font-size:16px;flex-shrink:0}.new-project-btn{margin:8px;padding:10px;border-radius:8px;border:1px dashed var(--color-border);background:transparent;color:var(--color-text-muted);font-size:13px;display:flex;align-items:center;justify-content:center;gap:6px;transition:all .15s}.new-project-btn:hover{border-color:var(--color-primary);color:var(--color-primary);background:#6366f10d}.knowledge-section{border-top:1px solid var(--color-border);padding:12px 16px;font-size:12px}.knowledge-section h4{color:var(--color-text-muted);margin-bottom:8px;font-size:11px;text-transform:uppercase;letter-spacing:.5px}.knowledge-toggle{display:flex;align-items:center;gap:8px;padding:4px 0;color:var(--color-text-muted);cursor:pointer}.knowledge-toggle input{width:auto}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.preview-area{flex:1;display:flex;flex-direction:column;border-bottom:1px solid var(--color-border);min-height:0}.preview-header{padding:8px 16px;font-size:12px;color:var(--color-text-muted);background:var(--color-surface);border-bottom:1px solid var(--color-border);display:flex;align-items:center;gap:8px}.preview-header .actions{margin-left:auto;display:flex;gap:6px}.preview-header button{padding:4px 10px;border-radius:6px;border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text-muted);font-size:12px;transition:all .15s}.preview-header button:hover{border-color:var(--color-primary);color:var(--color-primary)}.preview-header button.deploy{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.preview-header button.deploy:hover{background:var(--color-primary-hover)}.preview-frame{flex:1;background:#fff;border:none;width:100%}.preview-empty{flex:1;display:flex;align-items:center;justify-content:center;color:var(--color-text-muted);font-size:14px;flex-direction:column;gap:12px;background:var(--color-bg)}.preview-empty .icon{font-size:48px;opacity:.3}.chat-area{height:45%;min-height:200px;display:flex;flex-direction:column;background:var(--color-bg)}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.chat-message{display:flex;gap:10px;font-size:13px;line-height:1.6}.chat-message .avatar{width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}.chat-message.user .avatar{background:var(--color-primary)}.chat-message.assistant .avatar{background:var(--color-surface)}.chat-message .content{flex:1;min-width:0}.chat-message .content p{margin-bottom:6px}.chat-message .content pre{background:var(--color-code-bg);border-radius:6px;padding:12px;overflow-x:auto;font-size:12px;font-family:Fira Code,JetBrains Mono,monospace;margin:6px 0;border:1px solid var(--color-border)}.chat-message .content code{font-size:12px;background:#ffffff0f;padding:2px 5px;border-radius:3px}.welcome{text-align:center;padding:40px 20px;color:var(--color-text-muted)}.welcome h2{font-size:20px;color:var(--color-text);margin-bottom:8px}.welcome p{font-size:13px;line-height:1.6}.input-area{padding:10px 16px;border-top:1px solid var(--color-border);display:flex;gap:10px;align-items:flex-end;background:var(--color-surface)}.input-area textarea{flex:1;resize:none;min-height:40px;max-height:120px;padding:10px 14px;border-radius:10px;font-size:13px;line-height:1.4}.input-area button.send{width:40px;height:40px;border-radius:10px;border:none;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;transition:all .15s}.input-area button.send:hover{background:var(--color-primary-hover)}.input-area button.send:disabled{opacity:.4;cursor:not-allowed}.input-area button.voice{width:40px;height:40px;border-radius:10px;border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text-muted);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;transition:all .15s}.input-area button.voice:hover{border-color:var(--color-primary);color:var(--color-primary)}.input-area button.voice.recording{background:var(--color-danger);border-color:var(--color-danger);color:#fff;animation:pulse 1.5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:2px}@media(max-width:768px){.sidebar{display:none}.sidebar.open{display:flex;position:fixed;top:0;left:0;bottom:0;z-index:100;width:280px}.chat-area{height:50%}.mobile-menu-btn{display:flex!important}}.mobile-menu-btn{display:none;width:36px;height:36px;align-items:center;justify-content:center;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);color:var(--color-text-muted);font-size:18px}.modal-backdrop{position:fixed;inset:0;background:#00000080;z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}.modal{background:var(--color-surface);border-radius:12px;width:100%;max-width:600px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 20px 60px #0000004d}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--color-border)}.modal-header h2{font-size:16px;margin:0}.modal-close{width:32px;height:32px;border-radius:6px;border:none;background:transparent;color:var(--color-text-muted);font-size:18px;display:flex;align-items:center;justify-content:center}.modal-close:hover{background:var(--color-bg)}.kb-new{display:flex;gap:8px;padding:12px 20px}.kb-new input{flex:1;padding:8px 12px;border:1px solid var(--color-border);border-radius:6px;font-size:13px;background:var(--color-bg);color:var(--color-text)}.kb-new button{padding:8px 16px;border-radius:6px;border:none;background:var(--color-primary);color:#fff;font-size:13px;white-space:nowrap}.kb-hint{padding:0 20px 12px;font-size:12px;color:var(--color-text-muted)}.kb-list{flex:1;overflow-y:auto;padding:0 20px 20px}.kb-item{border:1px solid var(--color-border);border-radius:8px;margin-bottom:10px;overflow:hidden}.kb-item-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:var(--color-bg)}.kb-item-name{font-size:13px;font-weight:500}.kb-item-actions{display:flex;gap:6px}.kb-item-actions button{padding:4px 10px;border-radius:4px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-muted);font-size:12px}.kb-item-actions button:hover{background:var(--color-bg)}.kb-item-actions button.danger{color:var(--color-danger);border-color:var(--color-danger)}.kb-item-preview{padding:10px 14px;font-size:12px;color:var(--color-text-muted);white-space:pre-wrap;line-height:1.5;border-top:1px solid var(--color-border)}.kb-edit textarea{width:100%;padding:12px;border:none;border-top:1px solid var(--color-border);font-size:13px;font-family:Fira Code,JetBrains Mono,monospace;background:var(--color-bg);color:var(--color-text);resize:vertical;min-height:150px}.kb-edit-actions{display:flex;gap:8px;padding:10px 14px;border-top:1px solid var(--color-border)}.kb-edit-actions button{padding:6px 14px;border-radius:6px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);font-size:13px}.kb-edit-actions button:first-child{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.kb-btn{width:100%;padding:10px 14px;border-radius:8px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);font-size:13px;display:flex;align-items:center;gap:8px}.kb-btn:hover{background:var(--color-bg)}