:root{--bg: #fafafa;--sidebar-bg: #f0f0f0;--card-bg: #ffffff;--text: #1a1a1a;--text-muted: #666;--border: #e0e0e0;--accent: #007aff;--accent-hover: #0056b3;--danger: #ff3b30;--pin: #ff9500;--tag-bg: #e8f0fe;--tag-text: #1a73e8;--radius: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.layout{display:flex;height:100vh}.sidebar{width:240px;background:var(--sidebar-bg);border-right:1px solid var(--border);padding:16px;display:flex;flex-direction:column;gap:8px;overflow-y:auto}.sidebar h2{font-size:13px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);margin-bottom:4px}.sidebar-item{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:var(--radius);cursor:pointer;font-size:14px;color:var(--text);text-decoration:none;transition:background .15s}.sidebar-item:hover{background:var(--border)}.sidebar-item.active{background:var(--accent);color:#fff}.main{flex:1;display:flex;flex-direction:column;overflow:hidden}.toolbar{display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid var(--border);background:var(--card-bg)}.toolbar input[type=search]{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none}.toolbar input[type=search]:focus{border-color:var(--accent)}.note-list{flex:1;overflow-y:auto;padding:12px 20px;display:flex;flex-direction:column;gap:8px}.note-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:12px 16px;cursor:pointer;transition:box-shadow .15s}.note-card:hover{box-shadow:0 2px 8px #00000014}.note-card h3{font-size:15px;font-weight:600;margin-bottom:4px}.note-card .preview{font-size:13px;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.note-card .meta{display:flex;gap:8px;margin-top:6px;font-size:12px;color:var(--text-muted)}.pin-badge{color:var(--pin)}.tag{display:inline-block;background:var(--tag-bg);color:var(--tag-text);font-size:11px;padding:2px 8px;border-radius:12px}.btn{padding:8px 16px;border:none;border-radius:var(--radius);font-size:14px;cursor:pointer;transition:background .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-danger{background:var(--danger);color:#fff}.btn-small{padding:4px 10px;font-size:12px}.editor{flex:1;padding:20px;overflow-y:auto}.editor input[type=text]{width:100%;font-size:24px;font-weight:700;border:none;outline:none;margin-bottom:12px;background:transparent}.editor textarea{width:100%;min-height:400px;border:none;outline:none;font-size:15px;line-height:1.8;resize:vertical;font-family:inherit;background:transparent}.empty-state{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:16px}