*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8f9fa;--surface: #ffffff;--border: #e2e8f0;--border-light: #f1f5f9;--text: #1e293b;--text-muted: #64748b;--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--danger: #ef4444;--success: #22c55e;--radius: 8px;--shadow: 0 1px 3px rgba(0,0,0,.08);--shadow-lg: 0 4px 12px rgba(0,0,0,.1);--chat-width: 380px;--header-height: 52px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;overflow:hidden;height:100vh}#root{height:100vh;display:flex;flex-direction:column}.loading{display:flex;align-items:center;justify-content:center;height:100vh;font-size:18px;color:var(--text-muted)}.login-page{display:flex;align-items:center;justify-content:center;height:100vh;background:linear-gradient(135deg,#1e293b,#334155)}.login-card{background:var(--surface);padding:48px;border-radius:16px;box-shadow:var(--shadow-lg);text-align:center;width:380px}.login-logo{margin-bottom:16px}.login-card h1{font-size:24px;margin-bottom:4px}.login-subtitle{color:var(--text-muted);margin-bottom:32px;font-size:14px}.login-card form{display:flex;flex-direction:column;gap:12px}.login-card input{padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:15px;outline:none;transition:border-color .2s}.login-card input:focus{border-color:var(--primary)}.login-card button{padding:12px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;transition:background .2s}.login-card button:hover{background:var(--primary-hover)}.login-card button:disabled{opacity:.6;cursor:not-allowed}.login-error{color:var(--danger);font-size:13px}.app{display:flex;flex-direction:column;height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 16px;background:var(--surface);border-bottom:1px solid var(--border);gap:16px;flex-shrink:0}.header-left{display:flex;align-items:center;gap:12px}.header-center{flex:1;display:flex;justify-content:center}.header-right{display:flex;align-items:center;gap:8px}.app-title{font-size:16px;font-weight:700;color:var(--primary)}.canvas-type{font-size:12px;padding:3px 10px;background:var(--primary-light);color:var(--primary);border-radius:12px;font-weight:500}.canvas-type-selector{position:relative}.canvas-type-btn{display:flex;align-items:center;gap:6px;padding:4px 12px;background:var(--primary-light);color:var(--primary);border:1px solid transparent;border-radius:12px;font-size:13px;font-weight:500;cursor:pointer;transition:all .2s}.canvas-type-btn:hover{border-color:var(--primary)}.canvas-type-dropdown{position:absolute;top:100%;left:0;margin-top:4px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;z-index:50;min-width:180px}.canvas-type-option{display:flex;align-items:center;gap:8px;width:100%;padding:10px 14px;border:none;background:none;cursor:pointer;font-size:13px;text-align:left;transition:background .15s}.canvas-type-option:hover{background:var(--primary-light);color:var(--primary)}.canvas-type-option.active{background:var(--primary-light);color:var(--primary);font-weight:600}.canvas-type-option+.canvas-type-option{border-top:1px solid var(--border-light)}.code-header-center{display:flex;align-items:center;gap:8px}.language-select{padding:6px 10px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;outline:none;background:#fff;cursor:pointer;transition:border-color .2s}.language-select:focus{border-color:var(--primary)}.export-import-label{display:block;width:100%;padding:10px 14px;border:none;background:none;cursor:pointer;font-size:13px;text-align:left;transition:background .15s;border-top:1px solid var(--border-light)}.export-import-label:hover{background:var(--primary-light);color:var(--primary)}.doc-title-input{border:1px solid transparent;padding:6px 12px;border-radius:var(--radius);font-size:15px;font-weight:600;text-align:center;background:transparent;outline:none;min-width:200px;max-width:400px;transition:all .2s}.doc-title-input:hover{background:var(--bg)}.doc-title-input:focus{border-color:var(--primary);background:#fff}.btn-icon{background:none;border:none;cursor:pointer;padding:6px;border-radius:var(--radius);color:var(--text);display:flex;align-items:center;transition:background .2s}.btn-icon:hover{background:var(--bg)}.btn-save{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:13px;font-weight:600;cursor:pointer;transition:background .2s}.btn-save:hover{background:var(--primary-hover)}.btn-logout{padding:6px 14px;background:none;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;cursor:pointer;color:var(--text-muted);transition:all .2s}.btn-logout:hover{border-color:var(--danger);color:var(--danger)}.export-wrapper{position:relative}.btn-export{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);font-size:13px;font-weight:600;cursor:pointer;transition:all .2s}.btn-export:hover{border-color:var(--primary);color:var(--primary)}.btn-export:disabled{opacity:.6;cursor:not-allowed}.export-dropdown{position:absolute;top:100%;right:0;margin-top:4px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;z-index:50;min-width:150px}.export-dropdown button{display:block;width:100%;padding:10px 14px;border:none;background:none;cursor:pointer;font-size:13px;text-align:left;transition:background .15s}.export-dropdown button:hover{background:var(--primary-light);color:var(--primary)}.export-dropdown button+button{border-top:1px solid var(--border-light)}.app-body{display:flex;flex:1;overflow:hidden;height:calc(100vh - var(--header-height))}.chat-panel-container{width:var(--chat-width);min-width:var(--chat-width);border-right:1px solid var(--border);display:flex;flex-direction:column;background:var(--surface)}.chat-panel{display:flex;flex-direction:column;height:100%}.chat-toolbar{display:flex;gap:4px;padding:8px;border-bottom:1px solid var(--border);flex-shrink:0;flex-wrap:wrap;align-items:center}.toolbar-separator{width:1px;height:20px;background:var(--border);margin:0 2px}.toolbar-btn{padding:5px 10px;font-size:12px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;cursor:pointer;transition:all .2s;white-space:nowrap}.toolbar-btn:hover{border-color:var(--primary);color:var(--primary)}.toolbar-btn.active{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}.toolbar-btn:disabled{opacity:.4;cursor:not-allowed}.new-chat-btn{font-weight:600}.new-chat-btn:hover{background:var(--primary-light)}.templates-dropdown{border-bottom:1px solid var(--border);max-height:200px;overflow-y:auto;background:var(--bg)}.template-item{display:flex;flex-direction:column;width:100%;padding:10px 12px;border:none;background:none;cursor:pointer;text-align:left;border-bottom:1px solid var(--border-light);transition:background .15s}.template-item:hover{background:#fff}.template-name{font-size:13px;font-weight:600}.template-desc{font-size:11px;color:var(--text-muted)}.template-empty{padding:16px;text-align:center;color:var(--text-muted);font-size:13px}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:16px}.chat-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px;flex:1}.welcome-icon{font-size:48px;margin-bottom:12px}.chat-welcome h3{font-size:16px;margin-bottom:8px}.chat-welcome p{font-size:13px;color:var(--text-muted);margin-bottom:20px}.welcome-examples{display:flex;flex-direction:column;gap:6px;width:100%}.welcome-examples button{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;cursor:pointer;font-size:12px;text-align:left;transition:all .15s}.welcome-examples button:hover{border-color:var(--primary);background:var(--primary-light)}.chat-message{display:flex;gap:10px}.chat-message.user{flex-direction:row-reverse}.chat-message.user .message-content{background:var(--primary);color:#fff;border-radius:16px 16px 4px}.message-avatar{font-size:20px;flex-shrink:0;padding-top:2px}.message-content{background:var(--bg);padding:10px 14px;border-radius:16px 16px 16px 4px;font-size:13px;line-height:1.6;max-width:85%;word-break:break-word}.message-content code{background:#00000014;padding:1px 5px;border-radius:3px;font-size:12px}.cursor-blink{animation:blink 1s infinite}@keyframes blink{0%,50%{opacity:1}51%,to{opacity:0}}.selected-text-indicator{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#fef3c7;border-top:1px solid #fde68a;font-size:12px;flex-shrink:0}.selected-text-indicator span:first-child{font-weight:600;white-space:nowrap}.selected-preview{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-muted);font-style:italic}.selected-text-indicator button{padding:4px 10px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:11px;cursor:pointer;white-space:nowrap}.chat-input-area{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border);background:var(--surface);flex-shrink:0}.chat-input-area textarea{flex:1;border:1px solid var(--border);border-radius:var(--radius);padding:10px 12px;font-size:13px;resize:none;outline:none;font-family:inherit;line-height:1.4;transition:border-color .2s}.chat-input-area textarea:focus{border-color:var(--primary)}.send-btn{width:40px;height:40px;border:none;background:var(--primary);color:#fff;border-radius:var(--radius);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s;align-self:flex-end;flex-shrink:0}.send-btn:hover{background:var(--primary-hover)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.canvas-container{flex:1;overflow:hidden;background:#e8ecf0;display:flex;flex-direction:column}.word-canvas{display:flex;flex-direction:column;height:100%}.editor-toolbar{display:flex;align-items:center;gap:2px;padding:6px 12px;background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;flex-shrink:0}.toolbar-group{display:flex;align-items:center;gap:2px}.toolbar-divider{width:1px;height:24px;background:var(--border);margin:0 6px}.editor-toolbar button{width:32px;height:32px;border:none;background:none;cursor:pointer;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:14px;color:var(--text);transition:all .15s}.editor-toolbar button:hover{background:var(--bg)}.editor-toolbar button.active{background:var(--primary-light);color:var(--primary)}.editor-toolbar select{padding:4px 8px;border:1px solid var(--border);border-radius:4px;font-size:13px;outline:none;background:#fff;cursor:pointer}.editor-page{flex:1;overflow-y:auto;padding:32px;display:flex;justify-content:center}.editor-content{width:100%;max-width:816px;padding:0;border-radius:2px}.editor-content .tiptap{outline:none;--page-height: 1123px;background:#fff;padding:64px 72px;min-height:var(--page-height);box-shadow:0 1px 4px #0000001f;background-image:repeating-linear-gradient(to bottom,transparent 0px,transparent calc(var(--page-height) - 1px),#cbd5e1 calc(var(--page-height) - 1px),#cbd5e1 calc(var(--page-height) + 1px),#e8ecf0 calc(var(--page-height) + 1px),#e8ecf0 calc(var(--page-height) + 23px),#cbd5e1 calc(var(--page-height) + 23px),#cbd5e1 calc(var(--page-height) + 25px),white calc(var(--page-height) + 25px));background-size:100% calc(var(--page-height) + 25px);background-color:#fff}.editor-content .tiptap .page-break-node{margin:0 -72px;padding:0;position:relative;cursor:default;-webkit-user-select:none;user-select:none;background:#fff;display:flex;align-items:flex-end}.page-break-label{width:100%;height:25px;background:#e8ecf0;border-top:1px solid #cbd5e1;border-bottom:1px solid #cbd5e1;display:flex;align-items:center;justify-content:center;font-size:10px;color:#94a3b8;letter-spacing:.5px;text-transform:uppercase}.editor-content .tiptap .page-break-node:after{display:none}.editor-content .tiptap h1{font-size:28px;font-weight:700;margin:24px 0 12px;line-height:1.3}.editor-content .tiptap h2{font-size:22px;font-weight:600;margin:20px 0 10px;line-height:1.3}.editor-content .tiptap h3{font-size:18px;font-weight:600;margin:16px 0 8px;line-height:1.3}.editor-content .tiptap p{margin:8px 0;font-size:15px;line-height:1.7}.editor-content .tiptap ul,.editor-content .tiptap ol{margin:8px 0;padding-left:24px}.editor-content .tiptap li{margin:4px 0}.editor-content .tiptap blockquote{border-left:3px solid var(--primary);padding-left:16px;margin:12px 0;color:var(--text-muted);font-style:italic}.editor-content .tiptap hr{border:none;border-top:2px solid var(--border);margin:24px 0}.editor-content .tiptap mark{background:#fef08a;padding:1px 2px;border-radius:2px}.editor-content .tiptap strong{font-weight:700}.editor-content .tiptap table{border-collapse:collapse;width:100%;margin:12px 0}.editor-content .tiptap th,.editor-content .tiptap td{border:1px solid var(--border);padding:8px 12px;text-align:left}.editor-content .tiptap th{background:var(--bg);font-weight:600}.editor-content .tiptap code{background:var(--bg);padding:2px 6px;border-radius:3px;font-family:SF Mono,Monaco,Consolas,monospace;font-size:13px}.editor-content .tiptap ::selection{background:#2563eb33}.persisted-selection{background:#2563eb26;border-bottom:2px solid rgba(37,99,235,.4);border-radius:2px}.selection-context-menu{border-top:1px solid #fde68a;background:#fffbeb;flex-shrink:0}.selection-header{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid #fde68a}.selection-icon{font-size:14px;flex-shrink:0}.selection-header .selected-preview{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;color:var(--text-muted);font-style:italic}.selection-clear{background:none;border:none;cursor:pointer;font-size:16px;color:var(--text-muted);padding:2px 6px;border-radius:4px;line-height:1;transition:all .15s}.selection-clear:hover{background:#00000014;color:var(--text)}.selection-actions{display:flex;gap:4px;padding:6px 12px;flex-wrap:wrap}.selection-actions button{padding:4px 10px;font-size:11px;border:1px solid #e5e7eb;border-radius:14px;background:#fff;cursor:pointer;transition:all .15s;white-space:nowrap}.selection-actions button:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.sidebar-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0000004d;z-index:100}.sidebar{position:fixed;top:0;left:0;bottom:0;width:320px;background:var(--surface);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;z-index:101}.sidebar-header{display:flex;justify-content:space-between;align-items:center;padding:16px;border-bottom:1px solid var(--border)}.sidebar-header h2{font-size:18px}.sidebar-new-btn{margin:12px;padding:10px;border:1px dashed var(--border);border-radius:var(--radius);background:none;cursor:pointer;font-size:13px;transition:all .2s;text-align:center}.sidebar-new-btn:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.sidebar-list{flex:1;overflow-y:auto;padding:0 12px 12px}.sidebar-doc{display:flex;justify-content:space-between;align-items:center;padding:12px;border-radius:var(--radius);cursor:pointer;transition:background .15s;border:1px solid transparent}.sidebar-doc:hover{background:var(--bg);border-color:var(--border)}.doc-info{display:flex;flex-direction:column;gap:2px;overflow:hidden}.doc-title{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.doc-date{font-size:11px;color:var(--text-muted)}.doc-delete{background:none;border:none;cursor:pointer;font-size:16px;opacity:0;transition:opacity .15s;padding:4px}.sidebar-doc:hover .doc-delete{opacity:1}.doc-delete:hover{transform:scale(1.1)}.sidebar-loading,.sidebar-empty{text-align:center;padding:32px 16px;color:var(--text-muted);font-size:14px}@media (max-width: 900px){:root{--chat-width: 300px}.editor-content{padding:32px 40px}}@media (max-width: 700px){.app-body{flex-direction:column}.chat-panel-container{width:100%;min-width:100%;max-height:50%;border-right:none;border-bottom:1px solid var(--border)}.editor-page{padding:16px}.editor-content{padding:24px;min-height:auto}}.code-canvas{display:flex;flex-direction:column;height:100%;background:#1e1e2e}.code-editor-wrapper{display:flex;flex:1;overflow:hidden}.line-numbers{width:50px;padding:16px 0;overflow:hidden;background:#181825;color:#6c7086;font-family:SF Mono,Monaco,Consolas,Courier New,monospace;font-size:14px;line-height:1.6;text-align:right;-webkit-user-select:none;user-select:none;flex-shrink:0}.line-number{padding:0 12px 0 0;height:22.4px}.code-textarea{flex:1;padding:16px;margin:0;border:none;outline:none;background:#1e1e2e;color:#cdd6f4;font-family:SF Mono,Monaco,Consolas,Courier New,monospace;font-size:14px;line-height:1.6;resize:none;-moz-tab-size:2;tab-size:2;white-space:pre;overflow:auto}.code-textarea::placeholder{color:#585b70}.code-textarea::selection{background:#89b4fa4d}