:root{--bg: #fafafa;--bg-deep: #f5f5f5;--bg-hover: #f0f0f0;--canvas: #ffffff;--ink: #1f1f1f;--ink-dim: #505050;--ink-faint: #b3b3b3;--line: #e2e2e2;--line-strong: #d4d4d4;--accent: #2ed790;--accent-deep: #29ad76;--accent-soft: #e6f9f1;--link: #245a94;--ok: #29ad76;--danger: #ca3f4f;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-serif: "Songti SC", "Noto Serif CJK SC", "STSong", serif;--font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;--topbar-h: 48px;--radius: 6px;--paper: var(--bg);--paper-deep: var(--bg-deep);--vermilion: var(--accent);--vermilion-deep: var(--accent-deep);--vermilion-soft: var(--accent-soft);--indigo: var(--link);--indigo-soft: #e8f0f8}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%}body{font-family:var(--font-sans);font-size:14px;color:var(--ink);background:var(--canvas);overflow:hidden;-webkit-font-smoothing:antialiased}::selection{background:var(--accent-soft)}:focus-visible{outline:2px solid var(--accent);outline-offset:1px;border-radius:3px}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea{font-family:inherit}@media (prefers-reduced-motion: reduce){*,*:before,*:after{transition:none!important;animation:none!important}}.app{display:flex;height:100%}.rail{width:56px;flex-shrink:0;background:#1c1c1c;display:flex;flex-direction:column;align-items:center;padding:12px 0;gap:4px}.rail-brand{margin-bottom:18px}.rail-seal{width:32px;height:32px;background:var(--accent);color:#fff;font-size:17px;font-weight:700;font-family:var(--font-serif);display:flex;align-items:center;justify-content:center;border-radius:8px;box-shadow:0 2px 6px #2ed79059}.rail-nav{display:flex;flex-direction:column;gap:6px}.rail-btn{width:38px;height:38px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#9a9a9a;transition:background .15s,color .15s}.rail-btn:hover{background:#ffffff14;color:#fff}.rail-btn.active{background:#2ed79029;color:var(--accent)}.main-col{flex:1;min-width:0;display:flex;flex-direction:column;background:var(--canvas)}.topbar{height:var(--topbar-h);display:flex;align-items:center;gap:14px;padding:0 18px;background:var(--canvas);border-bottom:1px solid var(--line);flex-shrink:0}.topbar-path{flex:1;color:var(--ink-dim);font-size:12.5px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.topbar-path:empty:before{content:"未选择文件";color:var(--ink-faint)}.topbar-nav{display:flex;gap:2px}.nav-link{padding:5px 12px;border-radius:var(--radius);font-size:13px;color:var(--ink-dim);text-decoration:none;transition:background .15s,color .15s}.nav-link:hover{background:var(--bg-deep);color:var(--ink)}.nav-link.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.layout{flex:1;display:flex;overflow:hidden;background:var(--canvas)}.tree-wrap{width:264px;min-width:190px;display:flex;flex-direction:column;background:#eff0f0;flex-shrink:0}.panel-title{padding:12px 14px 6px;font-size:11px;font-weight:700;letter-spacing:1.5px;color:var(--ink-faint);text-transform:uppercase;flex-shrink:0}.viewer-wrap{flex:1;display:flex;flex-direction:column;background:var(--canvas);min-width:0}.resizer{width:6px;cursor:col-resize;background:transparent;flex-shrink:0;transition:background .15s}.resizer:hover,.resizer:active{background:var(--accent-soft)}.chat-wrap{display:flex;flex-direction:column;background:var(--bg);flex-shrink:0;min-width:0}.panel-toggles{position:absolute;right:10px;bottom:10px;display:flex;gap:6px;z-index:10}.btn-icon{width:30px;height:30px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:var(--ink-dim);transition:background .15s,color .15s}.btn-icon:hover{background:var(--bg-deep);color:var(--ink)}.btn-ghost{display:inline-flex;align-items:center;gap:5px;padding:6px 12px;border-radius:var(--radius);font-size:12.5px;color:var(--ink-dim);background:transparent;transition:background .15s,color .15s}.btn-ghost:hover{background:var(--bg-deep);color:var(--ink)}.btn-primary{display:inline-flex;align-items:center;gap:5px;padding:6px 14px;border-radius:var(--radius);font-size:12.5px;font-weight:600;color:#fff;background:var(--accent);transition:background .15s}.btn-primary:hover{background:var(--accent-deep)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#1e1e2866;display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:var(--canvas);border-radius:12px;padding:22px 24px;width:420px;max-width:calc(100vw - 40px);box-shadow:0 14px 44px #1e1e282e}.modal.small{width:360px}.modal h3{font-size:16px;font-weight:700;margin-bottom:14px}.modal-text{color:var(--ink-dim);margin:6px 0 16px}.modal-error{color:var(--danger);font-size:12.5px;margin-top:8px}.modal-note{font-size:11.5px;color:var(--ink-dim);margin-top:10px}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}.modal-actions button{padding:7px 15px;border-radius:var(--radius);background:var(--bg-deep);font-size:13px;transition:background .15s}.modal-actions button:hover{background:var(--bg-hover)}.modal-actions button.danger{background:var(--danger);color:#fff}.modal-actions button.danger:hover{background:#c23e3a}.field-label{display:block;font-size:12px;color:var(--ink-dim);margin:12px 0 4px}.field{width:100%;background:var(--bg);border:none;border-radius:var(--radius);padding:9px 12px;font-size:13px;color:var(--ink);transition:box-shadow .15s}.field:focus{outline:none;box-shadow:0 0 0 2px var(--accent-soft)}.toast{position:fixed;bottom:26px;left:50%;transform:translate(-50%);background:var(--ink);color:#fff;padding:10px 20px;border-radius:var(--radius);font-size:13px;z-index:200;box-shadow:0 6px 20px #1e1e284d;animation:toast-in .2s ease}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(8px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.settings-page{flex:1;overflow:auto;background:var(--bg);padding:36px 32px 80px}.settings-title{font-size:22px;font-weight:700;margin-bottom:22px}.settings-card{background:var(--canvas);border-radius:12px;padding:22px 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8px;border-radius:var(--radius);cursor:pointer;-webkit-user-select:none;user-select:none;font-size:13px;transition:background .12s}.tree-row:hover{background:var(--paper-deep)}.tree-row.active{background:var(--vermilion-soft);color:var(--vermilion-deep)}.tree-arrow{width:14px;display:inline-flex;justify-content:center;color:var(--ink-faint);transition:transform .15s;flex-shrink:0}.tree-arrow.open{transform:rotate(90deg)}.tree-arrow.leaf{visibility:hidden}.tree-folder-icon{color:var(--ink-dim);flex-shrink:0}.tree-file-icon{color:var(--ink-faint);flex-shrink:0}.tree-row.active .tree-file-icon{color:var(--vermilion)}.tree-label{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.tree-add-btn{width:20px;height:20px;border-radius:4px;display:flex;align-items:center;justify-content:center;color:var(--ink-faint);opacity:0;transition:opacity .12s,background .12s,color .12s;flex-shrink:0}.tree-row.folder:hover .tree-add-btn{opacity:1}.tree-add-btn:hover{background:var(--vermilion-soft);color:var(--vermilion)}.tree-children{margin-left:13px}.tree-children.collapsed{display:none}.new-file-row{padding:2px 7px;cursor:default}.new-file-input{flex:1;min-width:0;background:var(--canvas);border:none;box-shadow:0 0 0 1.5px var(--vermilion);border-radius:4px;padding:3px 7px;font-size:12.5px;color:var(--ink);outline:none}.trash-section{border-top:1px solid var(--line);padding:4px 8px 8px;flex-shrink:0;background:var(--paper)}.trash-count{margin-left:auto;background:var(--paper-deep);color:var(--ink-dim);font-size:11px;border-radius:9px;padding:0 7px;line-height:16px}.trash-list{margin-left:13px}.trash-empty{padding:8px 7px;color:var(--ink-faint);font-size:12px}.trash-item{display:flex;align-items:center;gap:4px;padding:3px 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var(--line);background:var(--canvas);flex-shrink:0}.viewer-title{font-family:var(--font-serif);font-size:15px;font-weight:600;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0}.viewer-meta{display:flex;gap:12px;flex-shrink:0}.meta-item{font-size:12px;color:var(--ink);font-variant-numeric:tabular-nums}.meta-item.dim{color:var(--ink-dim)}.viewer-actions{display:flex;gap:8px;flex-shrink:0}.viewer-body{flex:1;overflow:auto;padding:28px 36px 60px}.viewer-hint{padding:60px 24px;text-align:center;color:var(--ink-faint);font-size:13.5px;line-height:1.8}.viewer-hint.error{color:var(--danger)}.plain-text{font-family:var(--font-mono);font-size:13px;line-height:1.7;white-space:pre-wrap;word-break:break-word}.editor-area{flex:1;display:flex;flex-direction:column;min-height:0}.editor-toolbar{display:flex;align-items:center;gap:2px;padding:5px 10px;border-bottom:1px solid var(--line);background:var(--bg);flex-shrink:0;flex-wrap:wrap}.tool-btn{padding:3px 8px;border-radius:4px;font-size:12px;color:var(--ink-dim);transition:background .12s,color .12s;white-space:nowrap}.tool-btn:hover{background:var(--bg-deep);color:var(--ink)}.toolbar-sep{width:1px;height:16px;background:var(--line);margin:0 5px}.md-editor{flex:1;border:none;outline:none;resize:none;padding:20px 30px 60px;font-family:var(--font-mono);font-size:13.5px;line-height:1.75;background:var(--canvas);color:var(--ink)}.viewer-body{padding:32px 24px 80px}.md{max-width:860px;margin:0 auto;line-height:1.8;font-size:15px}.md h1,.md h2{font-weight:700;border-bottom:1px solid var(--line);padding-bottom:10px;margin:28px 0 16px}.md h1{font-size:26px}.md h2{font-size:21px}.md h3{font-size:17px;margin:22px 0 10px}.md h4{font-size:15px;margin:16px 0 8px}.md p{margin:10px 0}.md ul,.md ol{margin:10px 0;padding-left:26px}.md li{margin:5px 0}.md a{color:var(--link);text-decoration:none}.md a:hover{text-decoration:underline}.md strong{font-weight:700}.md blockquote{border-left:3px solid var(--line-strong);background:var(--bg);padding:10px 16px;margin:12px 0;color:var(--ink-dim);border-radius:0 6px 6px 0}.md code{font-family:var(--font-mono);font-size:13px;background:var(--bg-deep);padding:2px 5px;border-radius:4px}.md pre{background:#f6f8fa;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:14px 16px;overflow:auto;margin:12px 0;line-height:1.6}.md pre code{background:none;color:inherit;padding:0;font-size:13px}.md table{border-collapse:collapse;margin:14px 0;width:100%}.md th,.md td{border:1px solid var(--line);padding:8px 14px;text-align:left}.md th{background:var(--bg);font-weight:600}.md img{max-width:100%;border-radius:6px}.md hr{border:none;border-top:1px solid var(--line);margin:22px 0}.md-error{color:var(--danger)}.chat-panel{display:flex;flex-direction:column;height:100%}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--line);background:var(--bg);flex-shrink:0}.chat-title{font-family:var(--font-serif);font-size:14px;font-weight:600}.chat-actions{display:flex;gap:2px}.chat-messages{flex:1;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:9px}.chat-welcome{color:var(--ink-faint);font-size:12.5px;line-height:1.8;text-align:center;padding:30px 12px}.chat-msg{max-width:92%;padding:8px 11px;border-radius:8px;font-size:13px;line-height:1.65;word-break:break-word}.chat-msg.user{align-self:flex-end;background:var(--accent);color:#fdf6ee;border-bottom-right-radius:3px}.chat-msg.assistant{align-self:flex-start;background:var(--bg);border-bottom-left-radius:3px}.chat-msg.system{align-self:center;background:transparent;color:var(--ink-dim);font-size:12px}.chat-msg.error{color:var(--danger)}.chat-msg p{margin:4px 0}.chat-msg p:first-child{margin-top:0}.chat-msg p:last-child{margin-bottom:0}.chat-msg pre{background:#2b2722;color:#e8e2d8;padding:8px 10px;border-radius:6px;overflow:auto;margin:6px 0;font-size:12px}.chat-msg code{font-family:var(--font-mono);font-size:12px}.chat-msg p code{background:#0000000f;padding:0 4px;border-radius:3px}.chat-note{display:block;color:var(--ink-dim);font-size:11.5px}.chat-typing:after{content:"▍";animation:blink 1s infinite}@keyframes blink{50%{opacity:0}}.chat-input-row{display:flex;gap:8px;padding:10px 12px 12px;border-top:1px solid var(--line);background:var(--canvas);flex-shrink:0;align-items:flex-end}.chat-input-row textarea{flex:1;resize:vertical;min-height:84px;max-height:160px;background:var(--paper);border:none;border-radius:8px;padding:10px 12px;font-size:13.5px;line-height:1.6;color:var(--ink);transition:box-shadow .15s}.chat-input-row textarea:focus{outline:none;box-shadow:0 0 0 2px var(--vermilion-soft)}.chat-input-row textarea::placeholder{color:var(--ink-faint)}.btn-send{padding:10px 18px;border-radius:8px;background:var(--vermilion);color:#fdf6ee;font-size:13.5px;font-weight:600;transition:background .15s;align-self:stretch;display:flex;align-items:center}.btn-send:hover{background:var(--vermilion-deep)}.btn-send:disabled{opacity:.45;cursor:not-allowed}