:root{--fg: #1f2328;--muted: #57606a;--bg: #ffffff;--pane-bg: #fafbfc;--pane-border: #d0d7de;--header-bg: #ffffff;--beta-bg: #fff8e1;--beta-border: #f0ad4e}*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;color:var(--fg);background:var(--bg)}#app{display:grid;grid-template-rows:auto 1fr;height:100vh}.app-header{display:flex;align-items:center;gap:1rem;padding:.6rem 1rem;border-bottom:1px solid var(--pane-border);background:var(--header-bg)}.app-title{margin:0;font-size:1.1rem;font-weight:600}.beta-pill{font-size:.85rem;padding:.2rem .6rem;background:var(--beta-bg);border:1px solid var(--beta-border);border-radius:999px;color:#6b4f00}.app-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:1px;background:var(--pane-border);min-height:0}.pane{display:flex;flex-direction:column;background:var(--pane-bg);min-height:0;min-width:0}.pane-header{padding:.4rem .8rem;font-size:.85rem;font-weight:600;color:var(--muted);border-bottom:1px solid var(--pane-border);background:var(--header-bg)}.pane-body{flex:1;min-height:0;overflow:auto}.pane[data-pane=editor] .pane-body{overflow:hidden;padding:0}.pane[data-pane=architecture] .pane-body{overflow:hidden;padding:.6rem}.arch-svg{display:block;width:100%;height:100%}.pane[data-pane=faulttree] .pane-body{overflow:auto;padding:12px;background:#f6f8fa}.ft-svg{display:block}.pane[data-pane=cutsets] .pane-body{overflow:auto;padding:12px;background:#f6f8fa}.cs-section{margin:0 0 1.2rem}.cs-section:last-child{margin-bottom:0}.cs-section-title{margin:0 0 .4rem;font-size:.85rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.cs-pre{margin:0;padding:.7rem .9rem;background:#fff;border:1px solid var(--pane-border);border-radius:4px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:11px;line-height:1.4;color:var(--fg);white-space:pre;overflow-x:auto}