:root { --bg:#0b0d12; --fg:#e6e7ea; --muted:#9aa1ac; --a:#6ea8fe; --b:#9ef0a1; --grid:#1a1e26; --card:#11151b; --accent:#ffd36e; }
*{box-sizing:border-box}
body{margin:0; font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial,"Noto Sans","Apple Color Emoji","Segoe UI Emoji"; background:var(--bg); color:var(--fg);}
header{padding:16px 20px; border-bottom:1px solid #151a21;}
header h1{margin:0; font-size:18px; font-weight:600}
header p{margin:6px 0 0; color:var(--muted); font-size:13px}
main{display:grid; grid-template-columns: 360px 1fr; gap:16px; padding:16px;}
@media(max-width:1000px){ main{grid-template-columns:1fr;} }
.panel{background:var(--card); border:1px solid #151a21; border-radius:12px; padding:14px;}
.controls h2{font-size:14px; margin:4px 0 12px; color:var(--muted); letter-spacing:.03em; text-transform:uppercase}
.row{display:grid; grid-template-columns: 1fr auto 70px; gap:10px; align-items:center; margin:10px 0;}
.row label{font-size:13px; color:var(--fg)}
.row input[type="range"]{width:100%}
.small{font-size:12px; color:var(--muted)}
.split{display:grid; grid-template-columns:1fr; gap:8px;}
.btns{display:flex; gap:8px; margin-top:10px; flex-wrap:wrap}
button{background:#151a21; color:var(--fg); border:1px solid #1f2631; padding:8px 10px; border-radius:8px; cursor:pointer;}
button:hover{border-color:#2b3545}
canvas{background:var(--card); border-radius:12px; width:100%; height:520px; display:block;}
.legend{display:flex; gap:14px; align-items:center; margin-top:8px; flex-wrap:wrap}
.chip{display:inline-flex; align-items:center; gap:8px; font-size:13px; color:var(--muted)}
.dot{width:12px; height:12px; border-radius:50%}
.a{background:var(--a)}
.b{background:var(--b)}
.accent{color:var(--accent)}
details{margin-top:8px;}
summary{cursor:pointer; color:var(--muted)}
code{background:#0c0f14; padding:2px 4px; border-radius:6px; border:1px solid #171c25}
a{color:var(--a); text-decoration:none}
.kv{display:grid; grid-template-columns:auto 1fr; gap:8px 12px; margin-top:6px; font-size:13px; color:var(--muted)}
.val{font-size:12px; color:var(--muted); min-width:54px; text-align:right}
.toggle{display:flex; align-items:center; gap:8px; font-size:13px}

/* Optional: side-by-side Group A/B on very wide screens
@media(min-width: 1100px){
  .split{grid-template-columns:1fr 1fr;}
}
*/