:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #0f0f0f;--sidebar-bg: #161616;--border: rgba(255, 255, 255, .08);--text: #e8e8e8;--text-muted: rgba(255, 255, 255, .45);--accent: #6e8efb;--accent-hover: #8aa4fc;--danger: #e55c5c;--danger-hover: #f07070;--surface: rgba(255, 255, 255, .03);--surface-hover: rgba(255, 255, 255, .06);--radius: .5rem}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:var(--bg);color:var(--text)}.app{display:flex;height:100vh}.sidebar{width:280px;min-width:280px;background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1rem .75rem}.logo{font-size:1.25rem;font-weight:700;letter-spacing:-.02em}.btn-new{width:2rem;height:2rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text);font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s}.btn-new:hover{background:var(--accent);border-color:var(--accent);color:#fff}.search{margin:0 1rem .75rem;padding:.5rem .75rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text);font-size:.85rem;outline:none;transition:border-color .15s}.search:focus{border-color:var(--accent)}.search::placeholder{color:var(--text-muted)}.note-list{list-style:none;flex:1;overflow-y:auto;padding:0 .5rem}.note-list::-webkit-scrollbar{width:4px}.note-list::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:2px}.note-item{padding:.65rem .75rem;border-radius:var(--radius);cursor:pointer;display:flex;flex-direction:column;gap:.15rem;transition:background .15s;margin-bottom:2px}.note-item:hover{background:var(--surface-hover)}.note-item.active{background:#6e8efb1f;border-left:3px solid var(--accent);padding-left:calc(.75rem - 3px)}.note-title{font-size:.9rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.note-date{font-size:.72rem;color:var(--text-muted)}.empty-state{text-align:center;color:var(--text-muted);padding:2rem 1rem;font-size:.85rem}.main{flex:1;display:flex;flex-direction:column;overflow:hidden}.toolbar{display:flex;align-items:center;gap:1rem;padding:.75rem 1.5rem;border-bottom:1px solid var(--border);background:var(--sidebar-bg)}.title-input{flex:1;background:none;border:none;color:var(--text);font-size:1.15rem;font-weight:600;outline:none;letter-spacing:-.01em}.title-input::placeholder{color:var(--text-muted)}.toolbar-actions{display:flex;gap:.5rem}.btn-toggle,.btn-delete{padding:.4rem .85rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text-muted);font-size:.8rem;cursor:pointer;transition:all .15s}.btn-toggle:hover,.btn-toggle.active{background:var(--accent);border-color:var(--accent);color:#fff}.btn-delete:hover{background:var(--danger);border-color:var(--danger);color:#fff}.editor-area{flex:1;overflow-y:auto;padding:1.5rem}.editor{width:100%;height:100%;background:none;border:none;color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9rem;line-height:1.7;resize:none;outline:none}.editor::placeholder{color:var(--text-muted)}.preview{font-size:.95rem;line-height:1.75;max-width:48rem}.preview h1{font-size:1.75rem;font-weight:700;margin:1.5rem 0 .75rem;letter-spacing:-.02em;border-bottom:1px solid var(--border);padding-bottom:.4rem}.preview h2{font-size:1.35rem;font-weight:600;margin:1.25rem 0 .5rem;letter-spacing:-.01em}.preview h3{font-size:1.1rem;font-weight:600;margin:1rem 0 .4rem}.preview p{margin:.5rem 0}.preview strong{font-weight:600;color:#fff}.preview em{font-style:italic}.preview del{color:var(--text-muted)}.preview a{color:var(--accent);text-decoration:none}.preview a:hover{text-decoration:underline}.preview code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#ffffff0f;padding:.15em .4em;border-radius:.25rem;font-size:.85em}.preview pre{background:#ffffff0a;border:1px solid var(--border);border-radius:var(--radius);padding:1rem;overflow-x:auto;margin:.75rem 0}.preview pre code{background:none;padding:0;font-size:.85rem}.preview blockquote{border-left:3px solid var(--accent);padding:.25rem 1rem;margin:.75rem 0;color:var(--text-muted)}.preview hr{border:none;border-top:1px solid var(--border);margin:1.5rem 0}.preview ul{padding-left:1.5rem;margin:.5rem 0}.preview li{margin:.2rem 0}.preview img{max-width:100%;border-radius:var(--radius)}.empty-main{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.75rem;color:var(--text-muted)}.empty-icon{font-size:3rem;opacity:.3}.empty-main h2{font-size:1.15rem;font-weight:500;color:var(--text)}.empty-main p{font-size:.85rem}@media(max-width:640px){.sidebar{width:220px;min-width:220px}.editor-area{padding:1rem}}