:root{--bg:#fff;--border:#e2e8f0;--error-bg:#fff5f5;--error-text:#c53030;--text:#1a202c;--toolbar-bg:#f7fafc}[data-theme=dark]{--bg:#1a202c;--border:#2d3748;--error-bg:#742a2a;--error-text:#feb2b2;--text:#e2e8f0;--toolbar-bg:#2d3748}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;overflow:hidden}.app{background:var(--bg);color:var(--text);flex-direction:column;height:100%;font-family:system-ui,sans-serif;display:flex}.toolbar{background:var(--toolbar-bg);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:16px;padding:8px 16px;display:flex}.toolbar-title{margin-right:8px;font-size:15px;font-weight:600}.toolbar-group{align-items:center;gap:6px;font-size:13px;display:flex}.toolbar-group select{border:1px solid var(--border);border-radius:4px;padding:3px 6px;font-size:13px}.panes{flex:1;grid-template-columns:1fr 1fr;display:grid;overflow:hidden}.editor-pane{border-right:1px solid var(--border);overflow:hidden}.editor-split{flex-direction:column;height:100%;display:flex}.editor-section{flex-direction:column;flex:1;min-height:0;display:flex}.editor-section+.editor-section{border-top:1px solid var(--border)}.editor-label{background:var(--toolbar-bg);border-bottom:1px solid var(--border);color:var(--text);opacity:.75;padding:4px 12px;font-size:12px;font-weight:600}.editor-body{flex:1;min-height:0}.editor-loading{color:var(--text);opacity:.5;justify-content:center;align-items:center;height:100%;font-size:13px;display:flex}.preview-pane{justify-content:center;align-items:flex-start;padding:16px;display:flex;overflow:auto}.svg-preview svg{max-width:100%;height:auto}.mermaid-code{white-space:pre;font-family:Monaco,Menlo,monospace;font-size:13px}.error-banner{background:var(--error-bg);color:var(--error-text);border-radius:4px;width:100%;padding:12px 16px;font-family:monospace;font-size:13px}