:root{--bg:#0b1020;--panel:rgba(255,255,255,0.06);--text:rgba(255,255,255,0.92);--muted:rgba(255,255,255,0.68);--border:rgba(255,255,255,0.12)}
*{box-sizing:border-box}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;background:radial-gradient(1200px 700px at 15% 10%,rgba(120,80,255,0.35),transparent 60%),radial-gradient(1200px 700px at 85% 30%,rgba(0,200,255,0.22),transparent 55%),var(--bg);color:var(--text)}
.site-header{padding:28px 24px 8px;max-width:1200px;margin:0 auto}
.brand{display:flex;gap:12px;align-items:center}
.subtitle{color:var(--muted);margin:10px 0 0}
.layout{max-width:1200px;margin:0 auto;padding:16px 24px 28px;display:grid;gap:18px;grid-template-columns:360px 1fr}
@media (max-width:980px){.layout{grid-template-columns:1fr}}
.panel,.viz{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:16px;backdrop-filter:blur(10px)}
.grid{display:grid;gap:12px;margin-top:10px}
label{display:grid;gap:6px;color:var(--muted);font-size:14px}
.row{display:flex;gap:8px}
input,select,button{border-radius:12px;border:1px solid var(--border);background:rgba(0,0,0,0.18);color:var(--text);padding:10px 12px;font-size:14px}
input{width:100%}
.actions{display:flex;gap:10px;margin-top:14px}
button{cursor:pointer}
button.secondary{opacity:.85}
.viz-header{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.hint{color:var(--muted);font-size:13px}
.canvas-wrap{margin-top:12px;border-radius:14px;overflow:hidden;border:1px solid var(--border)}
svg{width:100%;height:auto;display:block;background:rgba(0,0,0,0.18)}
.stats{margin-top:12px;color:var(--muted);font-size:13px;line-height:1.4}
.footer{max-width:1200px;margin:0 auto;padding:0 24px 28px;color:var(--muted)}
code{color:rgba(255,255,255,0.85)}
#vizSvg{touch-action:none}
.draggable{cursor:grab}
.draggable:active{cursor:grabbing}