:root{color-scheme:dark;--bg: #0f1218;--panel: #161b24;--border: #232a36;--text: #e6e9ef;--muted: #8b94a7;--accent: #7aa2ff}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}button{font:inherit;cursor:pointer}.ghost{background:none;border:none;color:var(--muted);padding:2px 6px;border-radius:4px}.ghost:hover{color:var(--text);background:var(--border)}.login{display:grid;place-items:center;min-height:100vh}.login-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:32px;width:340px;display:flex;flex-direction:column;gap:12px}.login-card h1{margin:0;font-size:20px}.login-card p{margin:0;color:var(--muted);font-size:14px}.login-card input{font:inherit;padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text)}.login-card button{padding:10px;border-radius:8px;border:none;background:var(--accent);color:#0b0e14;font-weight:600}.error{color:#f7768e}.layout{display:flex;min-height:100vh}.sidebar{width:260px;flex-shrink:0;border-right:1px solid var(--border);background:var(--panel);display:flex;flex-direction:column}.brand{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;font-weight:600;border-bottom:1px solid var(--border)}.content{flex:1;min-width:0}.empty{display:grid;place-items:center;height:100%;color:var(--muted)}.tree{padding:8px 4px;overflow-y:auto;flex:1}.tree-row{display:flex;align-items:center;gap:2px;padding:3px 6px;border-radius:6px;font-size:14px}.tree-row:hover{background:var(--border)}.tree-row.active{background:#1d2634;color:var(--accent)}.tree-title{flex:1;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:2px 0}.caret{width:20px;font-size:10px}.tree-actions{visibility:hidden}.tree-row:hover .tree-actions{visibility:visible}.add-root{margin:10px;padding:8px;width:calc(100% - 20px);border-radius:8px;border:1px dashed var(--border);background:none;color:var(--muted)}.add-root:hover{color:var(--text);border-color:var(--muted)}.editor{max-width:860px;margin:0 auto;padding:28px 40px 80px}.editor-bar{display:flex;align-items:center;gap:12px;margin-bottom:18px}.title{flex:1;font-size:26px;font-weight:700;background:none;border:none;color:var(--text);outline:none;min-width:0}.save-state{color:var(--muted);font-size:12px;white-space:nowrap}.md{width:100%;min-height:60vh;background:none;border:none;outline:none;resize:none;color:var(--text);font:14px/1.6 ui-monospace,SF Mono,Menlo,monospace;unicode-bidi:plaintext}.preview{line-height:1.65;font-size:15px}.preview h1,.preview h2,.preview h3{border-bottom:1px solid var(--border);padding-bottom:4px}.preview code{background:var(--border);padding:1px 6px;border-radius:4px;font-size:13px}.preview pre{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:12px;overflow-x:auto}.preview pre code{background:none;padding:0}.preview blockquote{border-left:3px solid var(--accent);margin-left:0;padding-left:14px;color:var(--muted)}.preview a{color:var(--accent)}.preview img{max-width:100%}