:root{--bg: #faf9f6;--bg-elev: #ffffff;--bg-soft: #f1efe9;--ink: #1f1e1b;--ink-soft: #6b6860;--ink-faint: #a6a29a;--accent: #c25e3a;--accent-soft: #f3e0d6;--line: #e7e3da;--code-bg: #f1efe9;--preview-w: 50%;--mono: "Space Mono", "JetBrains Mono", Consolas, monospace;--serif: "Noto Serif SC", "Songti SC", serif;--sans: "Noto Sans SC", "Microsoft YaHei", sans-serif;--shadow: 0 10px 40px -18px rgba(31, 30, 27, .25)}[data-theme=dark]{--bg: #121110;--bg-elev: #1b1a18;--bg-soft: #23211e;--ink: #eceae4;--ink-soft: #a29d92;--ink-faint: #6f6a61;--accent: #e0865f;--accent-soft: #3a2a22;--line: #2c2a26;--code-bg: #242220;--shadow: 0 10px 40px -16px rgba(0, 0, 0, .6)}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:var(--sans);background:var(--bg);color:var(--ink);overflow:hidden;display:flex;flex-direction:column;transition:background .3s ease,color .3s ease}.layout{flex:1;display:flex;min-height:0}.topbar{height:56px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);background:var(--bg-elev);position:relative;z-index:20}.brand{display:flex;align-items:center;gap:10px;margin-right:8px}.brand-mark{font-family:var(--mono);font-weight:700;font-size:13px;background:var(--ink);color:var(--bg-elev);padding:4px 7px;border-radius:6px;letter-spacing:.5px}.brand-name{font-family:var(--serif);font-weight:600;letter-spacing:.4px;font-size:15px}.brand-accent{color:var(--accent);font-weight:700}.tools{display:flex;align-items:center;gap:2px;flex:1;overflow-x:auto;scrollbar-width:none}.tools::-webkit-scrollbar{display:none}.tool{background:transparent;border:none;color:var(--ink-soft);font-family:var(--mono);font-size:13px;padding:6px 9px;border-radius:6px;cursor:pointer;transition:background .15s,color .15s,transform .1s;white-space:nowrap}.tool:hover{background:var(--bg-soft);color:var(--ink)}.tool:active{transform:scale(.94)}.tool b,.tool i,.tool s{font-family:inherit;font-size:14px}.divider{width:1px;height:20px;background:var(--line);margin:0 6px}.actions{display:flex;align-items:center;gap:6px}.action{font-family:var(--sans);font-size:12.5px;padding:7px 14px;border-radius:8px;cursor:pointer;border:1px solid var(--line);background:var(--bg-elev);color:var(--ink-soft);transition:all .15s;white-space:nowrap}.action:hover{border-color:var(--ink);color:var(--ink)}.action.solid{background:var(--ink);color:var(--bg-elev);border-color:var(--ink);width:36px;padding:7px 0}.action.solid:hover{background:var(--accent);border-color:var(--accent)}.workspace{flex:1;min-width:0;display:flex;position:relative}.pane{height:100%;display:flex;flex-direction:column;min-width:0}.pane-edit{flex:1;width:calc(100% - var(--preview-w))}.pane-preview{flex:1;width:var(--preview-w)}.pane-label{height:38px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;font-family:var(--mono);font-size:11px;letter-spacing:2px;color:var(--ink-faint);border-bottom:1px solid var(--line);flex-shrink:0;background:var(--bg)}.pane-preview .pane-label{border-left:1px solid var(--line)}.counter{letter-spacing:0;font-size:11px}.preview-toggle{display:flex;gap:2px;align-items:center}.pv{background:transparent;border:none;color:var(--ink-faint);font-size:15px;cursor:pointer;padding:2px 5px;border-radius:5px;line-height:1;transition:background .15s,color .15s}.pv:hover,.pv.active{color:var(--ink);background:var(--bg-soft)}.actions .pv{font-size:14px;padding:6px 8px}#editor{flex:1;width:100%;border:none;outline:none;resize:none;padding:26px 30px;font-family:var(--mono);font-size:14px;line-height:1.75;color:var(--ink);background:var(--bg);caret-color:var(--accent)}#editor::placeholder{color:var(--ink-faint)}.preview{flex:1;overflow-y:auto;padding:26px 30px 60px;background:var(--bg-elev);border-left:1px solid var(--line);font-family:var(--sans);font-size:15px;line-height:1.85;color:var(--ink);scrollbar-width:thin}.preview a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent}.preview a:hover{border-bottom-color:var(--accent)}.preview h1,.preview h2,.preview h3,.preview h4,.preview h5,.preview h6{font-family:var(--serif);font-weight:600;line-height:1.35;margin:1.6em 0 .6em;color:var(--ink)}.preview h1{font-size:2em;padding-bottom:.35em;border-bottom:2px solid var(--line);margin-top:.4em}.preview h2{font-size:1.6em;padding-bottom:.3em;border-bottom:1px solid var(--line)}.preview h3{font-size:1.3em}.preview h4{font-size:1.1em}.preview p{margin:.8em 0}.preview ul,.preview ol{margin:.6em 0 .8em 1.6em}.preview li{margin:.25em 0}.preview li.task-list-item{list-style:none;margin-left:-1.4em}.preview li.task-list-item input{margin-right:.5em}.preview blockquote{margin:1em 0;padding:.2em 1.1em;border-left:3px solid var(--accent);color:var(--ink-soft);background:var(--accent-soft);border-radius:0 8px 8px 0}.preview blockquote p{margin:.5em 0}.preview code{font-family:var(--mono);font-size:.86em;background:var(--code-bg);padding:.15em .4em;border-radius:4px;color:var(--accent)}.preview pre{background:var(--code-bg);padding:16px 18px;border-radius:10px;overflow-x:auto;margin:1em 0;border:1px solid var(--line)}.preview pre code{background:none;padding:0;color:var(--ink);font-size:13px;line-height:1.7}.preview table{border-collapse:collapse;margin:1.2em 0;width:100%;font-size:.95em}.preview th,.preview td{border:1px solid var(--line);padding:8px 14px;text-align:left}.preview th{background:var(--bg-soft);font-weight:600;font-family:var(--serif)}.preview tr:nth-child(2n) td{background:var(--bg)}.preview hr{border:none;height:1px;background:var(--line);margin:2em 0}.preview img{max-width:100%;border-radius:10px;margin:.6em 0}.preview del{color:var(--ink-faint)}.preview strong{font-weight:700}.preview .math{color:var(--accent);font-family:var(--serif)}.resizer{width:5px;cursor:col-resize;position:relative;z-index:10;background:transparent;transition:background .15s}.resizer:hover,.resizer.active{background:var(--accent)}.ws-panel{width:0;flex-shrink:0;background:var(--bg-elev);border-right:1px solid var(--line);overflow:hidden;transition:width .3s cubic-bezier(.22,1,.36,1);display:flex;flex-direction:column}.ws-panel.open{width:280px}.ws-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);font-family:var(--serif);font-weight:600;flex-shrink:0;white-space:nowrap}.ws-body{padding:8px 0;overflow-y:auto;font-size:13px;flex:1;min-height:0}.ws-body .empty{color:var(--ink-faint);padding:24px 16px;text-align:center;line-height:1.8;font-size:12.5px}.tree-item .tree-row{display:flex;align-items:center;gap:4px;padding:5px 12px 5px 8px;border-radius:5px;cursor:pointer;color:var(--ink-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;user-select:none}.tree-item .tree-row:hover{background:var(--bg-soft);color:var(--ink)}.tree-row.active{color:var(--accent);background:var(--accent-soft)}.tree-arrow{width:14px;flex-shrink:0;font-size:10px;color:var(--ink-faint);text-align:center}.tree-file .tree-row{padding-left:8px}.tree-file .tree-row .tree-arrow{visibility:hidden}.tree-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tree-row.folder{color:var(--ink);font-weight:500}.toc-panel{width:0;flex-shrink:0;background:var(--bg-elev);border-right:1px solid var(--line);overflow:hidden;transition:width .3s cubic-bezier(.22,1,.36,1);display:flex;flex-direction:column}.toc-panel.open{width:260px}.toc-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);font-family:var(--serif);font-weight:600;flex-shrink:0;white-space:nowrap}.toc-body{padding:12px;overflow-y:auto;font-size:13.5px;flex:1;min-height:0}.toc-body a{display:block;padding:6px 10px;border-radius:6px;color:var(--ink-soft);text-decoration:none;margin:1px 0;transition:all .12s;border-left:2px solid transparent;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toc-body a:hover{color:var(--ink);background:var(--bg-soft)}.toc-body a.lvl-1{padding-left:12px;font-weight:600;color:var(--ink)}.toc-body a.lvl-2{padding-left:26px}.toc-body a.lvl-3{padding-left:40px;font-size:12.5px}.toc-body a.active{color:var(--accent);border-left-color:var(--accent)}.toc-body .empty{color:var(--ink-faint);padding:20px;text-align:center}.template-menu{position:fixed;z-index:60;background:var(--bg-elev);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:6px;min-width:160px;animation:menuIn .18s cubic-bezier(.22,1,.36,1);display:flex;flex-direction:column}@keyframes menuIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.template-menu button{background:transparent;border:none;text-align:left;padding:9px 12px;border-radius:8px;font-family:var(--sans);font-size:13.5px;color:var(--ink-soft);cursor:pointer;transition:all .12s}.template-menu button:hover{background:var(--bg-soft);color:var(--ink)}.toast{position:fixed;bottom:26px;left:50%;transform:translate(-50%) translateY(20px);background:var(--ink);color:var(--bg-elev);padding:10px 22px;border-radius:30px;font-size:13px;opacity:0;pointer-events:none;transition:all .3s cubic-bezier(.22,1,.36,1);z-index:100;box-shadow:var(--shadow)}.toast.show{opacity:1;transform:translate(-50%) translateY(0)}body.mode-edit .pane-preview{display:none}body.mode-edit .pane-edit{width:100%}body.mode-preview .pane-edit{display:none}body.mode-preview .pane-preview{width:100%}body.mode-preview .pane-preview .pane-label,body.mode-preview .pane-preview .preview{border-left:none}::-webkit-scrollbar{width:9px;height:9px}::-webkit-scrollbar-thumb{background:var(--line);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--ink-faint)}::-webkit-scrollbar-track{background:transparent}@media (max-width: 900px){.tools,.brand-name{display:none}#editor,.preview{padding:20px}}@media (max-width: 640px){.actions{gap:3px}.action{padding:7px 9px}#htmlBtn,#tocBtn{display:none}}@media print{body *{visibility:hidden}.preview,.preview *{visibility:visible}.preview{position:absolute;inset:0;border:none;padding:0}}