:root{
  --bg:#070b14;--panel:#0f172a;--text:#f8fafc;--muted:#94a3b8;
  --border:#263247;--accent:#38bdf8
}
*{box-sizing:border-box}
body{
  margin:0;background:radial-gradient(circle at 50% 0,#12213b 0,#070b14 38%,#05070d 100%);
  color:var(--text);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif
}
button,input{font:inherit}
.app{width:min(100%,900px);margin:auto;padding:18px 14px 40px}
.hero{text-align:center;padding:8px 8px 18px}
.eyebrow{margin:0 0 5px;color:#7dd3fc;text-transform:uppercase;font-size:.75rem;font-weight:900;letter-spacing:.12em}
h1{font-size:clamp(2rem,7vw,3.25rem);margin:0 0 8px}
h2,p{margin-top:0}.hero p:last-child,.mini{color:var(--muted)}
.mini{font-size:.86rem;margin:3px 0 0}
.panel{background:rgba(15,23,42,.96);border:1px solid var(--border);border-radius:24px;padding:18px;margin-bottom:14px}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:15px}
.panel-head>div{display:flex;align-items:center;gap:10px}.panel-head h2{margin:0;font-size:1.2rem}
.step{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:#172554;color:#93c5fd;font-weight:900;flex:none}
.status-pill{padding:7px 10px;border-radius:999px;background:#0b1220;border:1px solid var(--border);color:#cbd5e1;font-size:.83rem}
.matrix-stage{
  position:relative;overflow:hidden;display:grid;place-items:center;
  background:radial-gradient(circle,#121d31,#050811 72%);
  border:1px solid #1f2b3d;border-radius:22px;padding:18px;min-height:420px
}
.ambient{position:absolute;width:72%;aspect-ratio:1;border-radius:50%;filter:blur(65px);opacity:.28;pointer-events:none}
.led-grid{
  position:relative;z-index:2;width:min(100%,500px);aspect-ratio:1;
  display:grid;grid-template-columns:repeat(10,1fr);gap:7px;padding:12px;
  border-radius:18px;background:#090d16;border:2px solid #29364a;
  box-shadow:inset 0 0 35px rgba(0,0,0,.8)
}
.led{
  position:relative;aspect-ratio:1;border-radius:50%;background:#111827;
  border:1px solid #344157;overflow:visible;
  transition:background .08s linear,box-shadow .08s linear,transform .08s linear
}
.led::after{
  content:"";position:absolute;inset:16%;border-radius:50%;
  background:rgba(255,255,255,.18);filter:blur(1px)
}
.led.channel-view{background:#05070b!important;box-shadow:none!important}
.rgb-chip{display:none;position:absolute;inset:12%;grid-template-columns:repeat(3,1fr);gap:2px}
.channel-view .rgb-chip{display:grid}
.rgb-chip i{border-radius:50%;filter:blur(.3px)}
.view-switch{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.mode-btn,.ghost-btn{
  border:1px solid var(--border);background:#0b1220;color:#e2e8f0;
  min-height:44px;border-radius:13px;cursor:pointer;font-weight:800
}
.mode-btn.active{border-color:#7dd3fc;background:#10233d}
.ghost-btn{padding:8px 13px}
.control{padding:10px 0 15px;border-bottom:1px solid rgba(148,163,184,.13)}
.control:last-child{border-bottom:0}
.control-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.control-head label{font-weight:900}
.control-head output{min-width:52px;text-align:center;background:#020617;border:1px solid var(--border);padding:5px 9px;border-radius:999px}
input[type=range]{width:100%;height:34px;cursor:pointer}
.red-control input{accent-color:#ef4444}.green-control input{accent-color:#22c55e}.blue-control input{accent-color:#3b82f6}
.presets{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}
.preset{
  border:1px solid var(--border);background:#0b1220;color:#fff;border-radius:15px;
  min-height:74px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:7px;font-weight:800;cursor:pointer
}
.preset i{display:block;width:30px;height:30px;border-radius:50%;border:1px solid rgba(255,255,255,.22)}
.preset i.white{border-color:#64748b}
.result{display:grid;grid-template-columns:180px 1fr;gap:16px}
.swatch{min-height:180px;border-radius:22px;border:1px solid rgba(255,255,255,.18);background:white}
.metrics{display:grid;gap:8px}
.metrics div{display:flex;justify-content:space-between;gap:12px;padding:12px;background:#0b1220;border:1px solid rgba(148,163,184,.12);border-radius:13px}
.metrics span{color:var(--muted)}.metrics strong{text-align:right;font-variant-numeric:tabular-nums}
.info p{margin-bottom:0;color:#cbd5e1;line-height:1.6}
@media(max-width:600px){
  .matrix-stage{min-height:auto;padding:10px}
  .led-grid{gap:4px;padding:8px}
  .presets{grid-template-columns:repeat(2,1fr)}
  .preset{min-height:62px;flex-direction:row}
  .result{grid-template-columns:1fr}.swatch{min-height:125px}
  .view-switch{grid-template-columns:1fr}
}