:root{
  --bg0:#0b1220;
  --bg1:#111827;
  --card:#0f172a;
  --card2:#111c33;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --accent:#22c55e;
  --accent2:#60a5fa;
  --accent3:#fb7185;
  --ring:rgba(96,165,250,0.45);
  --shadow:0 20px 60px rgba(0,0,0,0.45);
}

*{ box-sizing:border-box; }

html,body{
  height:100%;
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 20% 10%, rgba(96,165,250,0.25), transparent 55%),
    radial-gradient(900px 600px at 80% 20%, rgba(251,113,133,0.20), transparent 60%),
    radial-gradient(900px 600px at 60% 80%, rgba(34,197,94,0.18), transparent 60%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.app{
  min-height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px;
}

.stage{
  width:min(1100px, 100%);
  display:grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap:22px;
  align-items:center;
}

@media (max-width: 980px){
  .stage{ grid-template-columns: 1fr; }
}

.cassette-wrap{
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 22px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

#cassetteSvg{
  width:100%;
  height:auto;
  display:block;
}

.panel{
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 22px;
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.panel-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:14px;
  margin-bottom:14px;
}

.title .brand{
  font-size:18px;
  font-weight:700;
  letter-spacing:0.2px;
}

.title .subtitle{
  font-size:13px;
  color:var(--muted);
  margin-top:4px;
}

.time{
  font-variant-numeric: tabular-nums;
  color:var(--muted);
  font-size:13px;
  white-space:nowrap;
}

.time .sep{ opacity:0.55; padding:0 6px; }

.scrub{
  position:relative;
  padding: 10px 2px 14px;
}

.scrub input[type="range"]{
  width:100%;
  appearance:none;
  height: 28px;
  background: transparent;
  margin: 0;
}

.scrub input[type="range"]::-webkit-slider-runnable-track{
  height: 10px;
  background: rgba(148,163,184,0.18);
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
}

.scrub input[type="range"]::-webkit-slider-thumb{
  appearance:none;
  width: 18px;
  height: 18px;
  margin-top: -4px;
  border-radius: 999px;
  background: linear-gradient(180deg, #fff, #cbd5e1);
  border: 1px solid rgba(15,23,42,0.55);
  box-shadow: 0 8px 20px rgba(0,0,0,0.35);
}

.scrub input[type="range"]:focus-visible{
  outline:none;
}

.scrub input[type="range"]:focus-visible::-webkit-slider-thumb{
  box-shadow: 0 0 0 5px var(--ring), 0 8px 20px rgba(0,0,0,0.35);
}

.scrub-fill{
  position:absolute;
  left:2px;
  right:2px;
  top: 19px;
  height: 10px;
  pointer-events:none;
  border-radius: 999px;
  overflow:hidden;
}

#scrubFillInner{
  height:100%;
  width:0%;
  background: linear-gradient(90deg, rgba(96,165,250,0.95), rgba(34,197,94,0.95));
  border-radius: 999px;
}

.controls{
  display:flex;
  gap:10px;
  align-items:center;
  justify-content:space-between;
  margin-top: 4px;
}

.btn{
  flex: 1 1 auto;
  height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  cursor:pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
  display:flex;
  align-items:center;
  justify-content:center;
  user-select:none;
}

.btn:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,0.085);
  border-color: rgba(255,255,255,0.16);
}

.btn:active{
  transform: translateY(0px);
}

.btn:focus-visible{
  outline:none;
  box-shadow: 0 0 0 5px var(--ring);
}

.btn.primary{
  flex: 1.3 1 auto;
  background: linear-gradient(180deg, rgba(34,197,94,0.95), rgba(22,163,74,0.95));
  border-color: rgba(34,197,94,0.60);
  color: #06120b;
}

.btn.primary:hover{
  background: linear-gradient(180deg, rgba(74,222,128,0.95), rgba(34,197,94,0.95));
}

.icon{
  font-size:16px;
  font-weight:700;
  letter-spacing: 0.8px;
}

.hint{
  margin-top: 12px;
  font-size: 12px;
  color: rgba(148,163,184,0.85);
  line-height: 1.35;
}