:root {
  --bg: #000;
  --panel: #0f0f0f;
  --panel-2: #080808;
  --line: #1a1a1a;
  --line-strong: #2a2a2a;
  --text: #e0e0e0;
  --text-strong: #f6f6f6;
  --muted: #666;
  --muted-2: #999;
  --accent: #fff;
  --danger: #f44;
  /* Red glow tokens — used for ambient backglow only */
  --glow: rgba(180,20,20,0.22);
  --glow-soft: rgba(180,20,20,0.12);
  --shadow: 0 0 60px rgba(160,10,10,0.18), 0 24px 80px rgba(0,0,0,0.7);
}

*{box-sizing:border-box;}
html,body{min-height:100%;}
body{
  margin:0;
  color:var(--text);
  font-family:"SF Mono","Fira Code","Courier New",monospace;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(180,15,15,0.32), transparent 55%),
    radial-gradient(ellipse at 0% 60%, rgba(140,8,8,0.16), transparent 40%),
    radial-gradient(ellipse at 100% 80%, rgba(140,8,8,0.12), transparent 40%),
    #000;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
/* Subtle scanline texture — same as Sound Machine */
body::before{
  content:""; position:fixed; inset:0; pointer-events:none;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 140px),
    linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), rgba(255,255,255,0.03) calc(100% - 1px));
  z-index:0;
}
button,input,select{font:inherit;}

/* ─── SHELL ──────────────────────────────────────────────────────────── */
.synth-shell{
  position:relative; z-index:1;
  width:min(1360px,calc(100vw - 24px));
  margin:14px auto 48px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:6px;
  background:rgba(0,0,0,0.55);
  box-shadow:var(--shadow);
  backdrop-filter:blur(0px);
}

/* ─── HEADER ─────────────────────────────────────────────────────────── */
.hero{
  display:flex; align-items:flex-start; justify-content:space-between;
  gap:18px; padding:4px 4px 18px; flex-wrap:wrap;
  border-bottom:1px solid var(--line); margin-bottom:18px;
}
.hero-left{flex:1;}
.hero-right{display:flex;flex-direction:column;align-items:flex-end;gap:10px;}
.eyebrow{
  margin:0 0 5px; color:var(--muted);
  letter-spacing:2px; text-transform:uppercase; font-size:0.76rem; font-weight:700;
}
h1{
  margin:0; color:var(--text-strong);
  font-size:clamp(1.6rem,4vw,3rem); line-height:0.96; letter-spacing:0.08em;
  text-shadow:0 0 40px var(--glow);
}
.k5-accent{
  color:#fff;
  text-shadow:0 0 18px rgba(255,255,255,0.25), 0 0 48px var(--glow);
}
.subtitle{margin:10px 0 0;color:var(--muted);font-size:0.82rem;line-height:1.5;}

/* ─── PRESET BAR ─────────────────────────────────────────────────────── */
.preset-bar{display:flex;align-items:center;gap:6px;}
#preset-select{
  padding:6px 10px; border:1px solid var(--line-strong); border-radius:4px;
  background:var(--panel); color:var(--text); font-size:0.82rem; cursor:pointer;
  min-width:160px; outline:none;
}
#preset-select:focus{border-color:rgba(255,255,255,0.3);}
#preset-select option,#preset-select optgroup{background:#0a0a0a;}
.util-btn{
  padding:6px 10px; border:1px solid var(--line-strong); border-radius:4px;
  color:var(--muted-2); background:var(--panel); font-size:0.78rem; font-weight:700;
  cursor:pointer; transition:border-color 100ms,color 100ms,transform 100ms;
  letter-spacing:1px; text-transform:uppercase;
}
.util-btn:hover{color:var(--text-strong);border-color:rgba(255,255,255,0.3);transform:translateY(-1px);}
.util-btn.danger{border-color:rgba(244,68,68,0.4);color:var(--danger);}
.util-btn.danger:hover{border-color:var(--danger);background:rgba(244,68,68,0.06);}

/* ─── POWER BTN ──────────────────────────────────────────────────────── */
.power-button{
  min-width:148px; padding:10px 18px;
  border:1px solid var(--line-strong); border-radius:4px;
  color:var(--muted-2); background:var(--panel);
  font-weight:700; text-transform:uppercase; letter-spacing:1px; cursor:pointer;
  transition:all 120ms;
}
.power-button:hover{color:var(--text-strong);border-color:rgba(255,255,255,0.3);}
.power-button.active{
  color:#000; background:#fff; border-color:#fff;
  box-shadow:0 0 28px rgba(255,255,255,0.15), 0 0 60px var(--glow);
}

/* ─── SCOPE ──────────────────────────────────────────────────────────── */
.scope-card{
  position:relative; overflow:hidden;
  border:1px solid var(--line); border-radius:6px;
  background:#000;
  box-shadow:inset 0 0 40px rgba(140,5,5,0.12);
}
#scope{display:block;width:100%;height:180px;background:#000;}
.scope-controls{
  position:absolute; top:10px; right:12px; display:flex; gap:6px;
}
.scope-btn{
  padding:4px 10px; border:1px solid var(--line-strong); border-radius:4px;
  color:var(--muted); background:rgba(0,0,0,0.6); font-size:0.72rem; font-weight:700;
  letter-spacing:1px; text-transform:uppercase; cursor:pointer; transition:all 100ms;
}
.scope-btn.active{color:#000;background:#fff;border-color:#fff;}
.status{
  position:absolute; left:14px; bottom:12px; padding:5px 12px;
  border:1px solid var(--line); border-radius:999px;
  color:var(--muted); background:rgba(0,0,0,0.6); font-size:0.76rem;
  letter-spacing:1px; text-transform:uppercase;
}

/* ─── CONTROLS GRID ──────────────────────────────────────────────────── */
.controls{
  display:grid;
  grid-template-columns:repeat(4,minmax(200px,1fr));
  gap:12px; margin-top:14px;
}
.section{
  padding:14px; border:1px solid var(--line); border-radius:6px;
  background:rgba(15,15,15,0.7);
}
.section h2{
  margin:0 0 10px; color:var(--text-strong); font-size:0.82rem;
  letter-spacing:2px; text-transform:uppercase;
  display:flex; align-items:center; gap:8px;
  font-family:"SF Mono","Fira Code","Courier New",monospace;
}
.sub-h2{margin:14px 0 8px!important;}

/* ─── BUTTONS ────────────────────────────────────────────────────────── */
.button-row{
  display:grid; grid-template-columns:repeat(4,1fr); gap:5px; margin-bottom:10px;
}
.wave-btn,.wave2-btn,.filt-btn,.lfoshape-btn,.lfodest-btn,.arp-pat-btn,.chord-btn,
.mode-btn,.utility-button,.tiny-toggle{
  border:1px solid var(--line-strong); border-radius:3px;
  color:var(--muted); background:transparent; cursor:pointer;
  transition:all 120ms; letter-spacing:1px;
}
.wave-btn,.wave2-btn,.filt-btn,.lfoshape-btn,.arp-pat-btn,.chord-btn{
  padding:7px 4px; font-weight:700; font-size:0.76rem;
}
.lfodest-btn{padding:6px 4px;font-size:0.74rem;font-weight:700;}
.wave-btn:hover,.wave2-btn:hover,.filt-btn:hover,.lfoshape-btn:hover,
.lfodest-btn:hover,.arp-pat-btn:hover,.chord-btn:hover{
  color:var(--text); border-color:rgba(255,255,255,0.22);
  background:rgba(255,255,255,0.04);
}
.wave-btn.active,.wave2-btn.active,.filt-btn.active,.lfoshape-btn.active,
.lfodest-btn.active,.arp-pat-btn.active,.chord-btn.active,.mode-btn.active,.tiny-toggle.active{
  color:#000; background:#fff; border-color:#fff;
  box-shadow:0 0 12px rgba(255,255,255,0.12), 0 0 32px var(--glow-soft);
}
.tiny-toggle{
  padding:3px 8px; font-size:0.72rem; font-weight:700; border-radius:3px;
  flex-shrink:0; align-self:center; margin-left:auto;
}
.mode-btn{
  width:100%; padding:8px 8px; font-weight:700; font-size:0.78rem; border-radius:4px;
  text-transform:uppercase; letter-spacing:1px;
}
.mode-btn:hover{color:var(--text);border-color:rgba(255,255,255,0.22);background:rgba(255,255,255,0.04);}
.utility-button{
  width:100%; margin-top:10px; padding:9px 8px; font-weight:700;
  border:1px solid rgba(244,68,68,0.35); color:var(--danger);
  background:transparent; border-radius:4px; text-transform:uppercase; letter-spacing:1px;
  cursor:pointer; transition:all 120ms;
}
.utility-button:hover{
  border-color:var(--danger); background:rgba(244,68,68,0.06);
}

/* ─── LABELS + SLIDERS ───────────────────────────────────────────────── */
label{
  display:flex; justify-content:space-between; gap:8px;
  margin:8px 0 4px; color:var(--muted-2); font-size:0.82rem;
}
label span{color:var(--text-strong); font-weight:700;}

/* ─── SLIDERS — full cross-browser ──────────────────────────────────── */
input[type="range"]{
  width:100%; margin-bottom:2px;
  -webkit-appearance:none; appearance:none;
  height:20px; background:transparent; cursor:pointer; outline:none;
}
/* Webkit track */
input[type="range"]::-webkit-slider-runnable-track{
  height:2px; border-radius:2px;
  background:var(--line-strong);
}
/* Webkit thumb */
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:12px; height:12px; border-radius:50%; margin-top:-5px;
  background:#fff;
  box-shadow:0 0 6px rgba(255,255,255,0.2), 0 0 18px var(--glow-soft);
  transition:box-shadow 0.12s, transform 0.12s;
}
input[type="range"]:hover::-webkit-slider-thumb{
  box-shadow:0 0 10px rgba(255,255,255,0.35), 0 0 28px var(--glow);
  transform:scale(1.18);
}
input[type="range"]:active::-webkit-slider-thumb{
  box-shadow:0 0 18px rgba(255,255,255,0.6), 0 0 40px var(--glow);
  transform:scale(1.28);
}
/* Firefox track */
input[type="range"]::-moz-range-track{
  height:2px; border-radius:2px;
  background:var(--line-strong); border:none;
}
input[type="range"]::-moz-range-progress{
  height:2px; border-radius:2px;
  background:rgba(255,255,255,0.4);
}
/* Firefox thumb */
input[type="range"]::-moz-range-thumb{
  border:none; width:12px; height:12px; border-radius:50%;
  background:#fff;
  box-shadow:0 0 6px rgba(255,255,255,0.2);
  cursor:pointer;
}
/* Special width for seq tempo slider */
#seqtempo{width:130px;}

/* ─── MIDI STATUS ────────────────────────────────────────────────────── */
.midi-status{
  margin-top:6px; padding:4px 8px; border:1px solid var(--line);
  border-radius:4px; color:var(--muted); font-size:0.74rem; letter-spacing:1px;
}

/* ─── STEP SEQUENCER ─────────────────────────────────────────────────── */
.seq-panel{
  margin-top:12px; padding:14px 16px 16px;
  border:1px solid var(--line); border-radius:6px;
  background:rgba(15,15,15,0.7);
}
.seq-header{display:flex;flex-direction:column;gap:10px;margin-bottom:12px;}
.seq-title-row{display:flex;align-items:center;gap:14px;}
.seq-title-row h2{
  margin:0; color:var(--text-strong); font-size:0.82rem;
  letter-spacing:2px; text-transform:uppercase;
  font-family:"SF Mono","Fira Code","Courier New",monospace;
}
.seq-controls-row{
  display:flex; align-items:center; gap:12px; flex-wrap:wrap;
}
.seq-tempo-label{
  display:flex; align-items:center; gap:6px; color:var(--muted-2); font-size:0.82rem; white-space:nowrap;
}
.seq-tempo-label span{color:var(--text-strong);font-weight:700;}
#seqtempo{width:130px;}

.seq-steps{
  display:grid; grid-template-columns:repeat(16,1fr); gap:4px;
}
.seq-step{display:flex;flex-direction:column;gap:3px;}
.seq-step-btn{
  width:100%; aspect-ratio:1/1.2; min-height:48px;
  border:1px solid var(--line); border-radius:3px;
  color:var(--muted); background:rgba(8,8,8,0.6);
  cursor:pointer; transition:all 80ms;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:2px; font-size:0.65rem;
}
.seq-step-btn:hover{border-color:var(--line-strong);color:var(--text);}
.seq-step-btn.active{
  color:var(--text-strong); background:rgba(255,255,255,0.07);
  border-color:rgba(255,255,255,0.22);
}
.seq-step-btn.seq-playing{
  color:#000!important; background:#fff!important;
  border-color:#fff!important;
  box-shadow:0 0 16px rgba(255,255,255,0.2), 0 0 32px var(--glow)!important;
}
.seq-num{font-size:0.6rem;opacity:0.4;line-height:1;}
.seq-note-lbl{font-size:0.7rem;font-weight:700;line-height:1;}
.seq-micros{display:flex;gap:2px;}
.seq-micros button{
  flex:1; padding:2px 0; border:1px solid var(--line); border-radius:2px;
  color:var(--muted); background:transparent; font-size:0.6rem; cursor:pointer;
  transition:all 80ms;
}
.seq-micros button:hover{border-color:var(--line-strong);color:var(--text);background:rgba(255,255,255,0.04);}

/* ─── KEYBOARD ───────────────────────────────────────────────────────── */
.keyboard-panel{
  margin-top:12px; padding:12px;
  border:1px solid var(--line); border-radius:6px; background:rgba(8,8,8,0.6);
}
.keyboard-help{
  display:flex; flex-wrap:wrap; justify-content:space-between;
  gap:10px; color:var(--muted); font-size:0.82rem; line-height:1.5; margin-bottom:4px;
}
#octave-display{color:var(--text-strong);}
.keyboard{
  position:relative; width:min(900px,100%); height:220px;
  margin:12px auto 4px; user-select:none; touch-action:none;
}
.key{
  position:absolute; bottom:0; display:flex; align-items:flex-end;
  justify-content:center; padding-bottom:10px;
  border:1px solid var(--line-strong); border-radius:0 0 4px 4px;
  cursor:pointer; transition:transform 70ms,background 70ms,box-shadow 70ms,color 70ms;
}
.key.white{
  z-index:1; width:calc(100%/8); height:210px;
  color:var(--muted); background:linear-gradient(180deg,#111 0%,#080808 100%);
}
.key.black{
  z-index:2; width:calc(100%/13); height:130px;
  color:var(--muted); background:linear-gradient(180deg,#000 0%,#050505 100%);
  box-shadow:0 8px 16px rgba(0,0,0,0.6);
}
.key.active{
  color:#000; background:#fff;
  transform:translateY(3px);
  box-shadow:0 0 20px rgba(255,255,255,0.15), 0 0 40px var(--glow);
}
.key-label{pointer-events:none;display:grid;gap:2px;text-align:center;font-size:0.76rem;}
.key-label small{color:inherit;opacity:0.55;font-size:0.64rem;}

/* ─── RESPONSIVE ─────────────────────────────────────────────────────── */
@media(max-width:1100px){.controls{grid-template-columns:repeat(4,1fr);}}
@media(max-width:900px){
  .controls{grid-template-columns:repeat(2,1fr);}
  .seq-steps{grid-template-columns:repeat(8,1fr);}
}
@media(max-width:640px){
  .synth-shell{padding:12px;border-radius:6px;}
  .hero{flex-direction:column;}
  .hero-right{width:100%;align-items:stretch;}
  .power-button{width:100%;}
  .controls{grid-template-columns:1fr;}
  .seq-steps{grid-template-columns:repeat(8,1fr);}
  .keyboard{height:176px;}
  .key.white{height:168px;}
  .key.black{height:106px;}
  .status{position:static;margin:0 10px 10px;display:inline-block;}
}