/* An amp is a physical object with a faceplate, and the interface may as well
   admit it. Warm metal rather than the cold slate of the ambient instrument —
   different instrument, different room. */
:root{
  --bg:#120f0d; --panel:#1b1613; --plate:#241d18; --line:#372c24;
  --ink:#f0e3d4; --dim:#a08d79; --faint:#6b5b4c;
  --accent:#e0a152; --accent-2:#d1623a; --hot:#e2563f; --lamp:#ff6b4a;
  --dial-bg:#100c09;
  --radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);
  font:14px/1.45 ui-sans-serif,system-ui,-apple-system,sans-serif;
  background-image:radial-gradient(ellipse at 50% -10%, #241a14 0%, #120f0d 60%)}
[hidden]{display:none !important}

/* ---------- gate ---------- */
.gate{position:fixed;inset:0;z-index:50;display:grid;place-items:center;
  background:rgba(10,8,7,.94);backdrop-filter:blur(6px)}
.gate.hidden{display:none}
.gate-card{max-width:460px;padding:30px 34px;text-align:center;
  background:var(--plate);border:1px solid var(--line);border-radius:14px}
.gate-card h1{margin:0 0 6px;font-size:34px;letter-spacing:.14em;text-transform:uppercase}
.sub{color:var(--dim);margin:0 0 20px}
.begin{background:var(--accent);color:#2a1a08;border:0;border-radius:999px;
  padding:11px 30px;font-size:15px;font-weight:700;cursor:pointer}
.begin:hover{filter:brightness(1.08)}
.warn{margin:18px 0 0;color:var(--dim);font-size:12px;line-height:1.5}
.warn b{color:var(--hot)}

/* ---------- top bar ---------- */
.bar{display:flex;align-items:center;gap:14px;padding:9px 16px;flex-wrap:wrap;
  background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.brand b{letter-spacing:.2em;text-transform:uppercase}
.tag{margin-left:8px;font-size:10px;color:var(--faint);letter-spacing:.18em;text-transform:uppercase}
.io{display:flex;align-items:center;gap:8px}
.state{font:11px ui-monospace,monospace;color:var(--faint)}
.state.live{color:var(--accent)}
.dev{max-width:190px}
.meters{display:flex;align-items:center;gap:9px;margin-left:auto}
.meter{width:130px;height:7px;background:var(--dial-bg);border-radius:4px;overflow:hidden}
.meter i{display:block;height:100%;width:0;border-radius:4px;
  background:linear-gradient(90deg,var(--accent),var(--hot));transition:width .06s linear}
.stat{font:11px ui-monospace,monospace;color:var(--faint);white-space:nowrap}
.mini{background:var(--plate);border:1px solid var(--line);color:var(--dim);
  border-radius:999px;padding:5px 13px;font-size:12px;cursor:pointer}
.mini:hover{color:var(--ink);border-color:#4d3e33}
.mini.on{border-color:var(--accent);color:var(--accent)}
.rec{display:flex;align-items:center;gap:7px}
.rec .dot{width:8px;height:8px;border-radius:50%;background:var(--faint)}
.rec.on .dot{background:var(--hot);box-shadow:0 0 9px var(--hot)}

/* ---------- layout ---------- */
.app{padding:16px;display:flex;flex-direction:column;gap:14px;max-width:1500px;margin:0 auto}
.head,.row{display:flex;gap:14px;flex-wrap:wrap}
.plate{flex:1 1 320px;min-width:290px;background:var(--plate);
  border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px 16px;
  box-shadow:inset 0 1px 0 #3d2f25, 0 8px 22px rgba(0,0,0,.35)}
.plate.wide{flex:2 1 560px}
.badge{font:10px ui-monospace,monospace;letter-spacing:.24em;color:var(--faint);
  margin-bottom:12px}
.knobs{display:grid;grid-template-columns:repeat(auto-fit,minmax(78px,1fr));gap:10px}

/* ---------- knobs ---------- */
.knob{display:flex;flex-direction:column;align-items:center;gap:5px;
  padding:6px 2px;border-radius:9px;cursor:ns-resize;user-select:none;touch-action:none}
.knob:hover{background:#2b231c}
.dial{--fill:0;width:56px;height:56px;border-radius:50%;position:relative;
  background:
    conic-gradient(from 215deg, var(--accent) calc(var(--fill) * 290deg), #2e241c 0 290deg, transparent 0),
    radial-gradient(circle at 50% 38%, #4a3a2d 0%, #221a14 70%);
  display:grid;place-items:center;
  box-shadow:0 2px 6px rgba(0,0,0,.5), inset 0 0 0 4px var(--dial-bg)}
.dial i{position:absolute;width:2px;height:15px;background:var(--ink);border-radius:2px;
  top:9px;transform-origin:50% 19px;
  transform:rotate(calc(-145deg + var(--fill) * 290deg))}
.knob .k{font:10px ui-monospace,monospace;letter-spacing:.1em;color:var(--dim);text-transform:uppercase}
.knob .v{font:11px ui-monospace,monospace;color:var(--ink)}

/* ---------- controls ---------- */
.sel{display:flex;flex-direction:column;gap:4px;margin-top:12px;
  font:10px ui-monospace,monospace;letter-spacing:.14em;color:var(--faint);text-transform:uppercase}
select,input[type=file]{background:var(--dial-bg);color:var(--ink);
  border:1px solid var(--line);border-radius:7px;padding:6px 8px;font-size:13px}
.go{background:var(--dial-bg);border:1px solid var(--line);color:var(--ink);
  border-radius:8px;padding:9px 12px;cursor:pointer;font-size:13px;width:100%}
.go:hover{border-color:var(--accent);color:var(--accent)}
.go.on{background:var(--accent);color:#2a1a08;border-color:var(--accent);font-weight:600}
.stack{display:flex;flex-direction:column;gap:9px}
.seg{display:flex;gap:0;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{flex:1;background:var(--dial-bg);border:0;color:var(--dim);
  padding:8px 4px;font-size:12px;cursor:pointer}
.seg button.on{background:var(--accent);color:#2a1a08;font-weight:600}
.cabrow{display:flex;gap:10px;align-items:flex-end;margin-top:12px;flex-wrap:wrap}
.cabrow .sel{margin-top:0}
.note{font-size:11px;color:var(--faint);margin:9px 0 0;line-height:1.5}
canvas{width:100%;display:block;margin-top:10px;border-radius:7px;background:var(--dial-bg)}

@media (max-width:620px){
  .plate{min-width:100%}
  .knobs{grid-template-columns:repeat(auto-fit,minmax(68px,1fr))}
  .dial{width:48px;height:48px}
}