:root{--bg-color: #f5f5f5;--sidebar-bg: #2c3e50;--sidebar-text: #ecf0f1;--sidebar-hover: #34495e;--sidebar-active: #2980b9;--editor-bg: #ffffff;--preview-bg: #fdfdfd;--border-color: #e0e0e0;--text-color: #333333;--accent-color: #3498db;--danger-color: #e74c3c}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;color:var(--text-color);background-color:var(--bg-color);height:100vh;overflow:hidden}#root{height:100%}.app-container{display:flex;height:100vh;width:100vw}.sidebar{width:250px;background-color:var(--sidebar-bg);color:var(--sidebar-text);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:20px;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-header h2{font-size:1.2rem;margin-bottom:15px}.add-btn{width:100%;padding:10px;background-color:var(--accent-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:700;transition:background-color .2s}.add-btn:hover{background-color:#2980b9}.sidebar-notes{flex:1;overflow-y:auto}.no-notes{padding:20px;text-align:center;color:#95a5a6;font-size:.9rem}.sidebar-note{padding:15px 20px;border-bottom:1px solid rgba(255,255,255,.05);cursor:pointer;transition:background-color .2s}.sidebar-note:hover{background-color:var(--sidebar-hover)}.sidebar-note.active{background-color:var(--sidebar-active)}.note-title-container{display:flex;justify-content:space-between;align-items:center;margin-bottom:5px}.note-title{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.delete-btn{background:none;border:none;color:#95a5a6;cursor:pointer;font-size:1rem;margin-left:10px}.delete-btn:hover{color:var(--danger-color)}.note-preview{font-size:.8rem;color:#bdc3c7;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.main-content{flex:1;display:flex;height:100vh}.pane{flex:1;display:flex;flex-direction:column;height:100%}.editor-pane{border-right:1px solid var(--border-color);background-color:var(--editor-bg)}.editor{display:flex;flex-direction:column;height:100%}.editor-empty,.preview-empty{display:flex;align-items:center;justify-content:center;height:100%;color:#7f8c8d;font-size:1.2rem}.editor-title-input{padding:15px 20px;font-size:1.5rem;font-weight:700;border:none;border-bottom:1px solid var(--border-color);outline:none}.editor-textarea{flex:1;padding:20px;font-size:1rem;font-family:Monaco,Menlo,Ubuntu Mono,Consolas,monospace;line-height:1.5;border:none;outline:none;resize:none;background-color:var(--editor-bg);color:var(--text-color)}.preview-pane{background-color:var(--preview-bg);overflow-y:auto}.preview{display:flex;flex-direction:column;height:100%}.preview-header{padding:15px 20px;border-bottom:1px solid var(--border-color);background-color:#f8f9fa}.preview-header h3{font-size:1.2rem;color:#2c3e50;margin:0;height:33px;display:flex;align-items:center}.preview-content{padding:30px;flex:1;overflow-y:auto}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4,.markdown-body h5,.markdown-body h6{margin-top:24px;margin-bottom:16px;font-weight:600;line-height:1.25}.markdown-body h1{font-size:2em;border-bottom:1px solid #eaecef;padding-bottom:.3em}.markdown-body h2{font-size:1.5em;border-bottom:1px solid #eaecef;padding-bottom:.3em}.markdown-body p,.markdown-body blockquote,.markdown-body ul,.markdown-body ol,.markdown-body dl,.markdown-body table,.markdown-body pre,.markdown-body details{margin-top:0;margin-bottom:16px}.markdown-body ul,.markdown-body ol{padding-left:2em}.markdown-body blockquote{padding:0 1em;color:#6a737d;border-left:.25em solid #dfe2e5}.markdown-body code{padding:.2em .4em;margin:0;font-size:85%;background-color:#1b1f230d;border-radius:3px;font-family:Monaco,Menlo,Ubuntu Mono,Consolas,monospace}.markdown-body pre{padding:16px;overflow:auto;font-size:85%;line-height:1.45;background-color:#f6f8fa;border-radius:3px}.markdown-body pre code{display:inline;max-width:auto;padding:0;margin:0;overflow:visible;line-height:inherit;word-wrap:normal;background-color:transparent;border:0}