:root {
  color-scheme: dark;
  --bg: #04060e;
  --panel: #0b1222;
  --panel-border: #334f78;
  --text: #deefff;
  --muted: #83a4c2;
  --accent: #78f9ff;
  --accent-2: #ff67cd;
  --ok: #afff9b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 8%, #172744 0, transparent 42%),
    radial-gradient(circle at 82% 0%, #2d1648 0, transparent 38%),
    var(--bg);
}

.app {
  width: min(980px, 94vw);
  margin: 2rem auto;
  display: grid;
  gap: 1rem;
}

.panel {
  background: linear-gradient(180deg, #111d35, var(--panel));
  border: 2px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06), 0 12px 32px rgba(0, 0, 0, 0.35);
}

.topbar {
  padding: 1rem 1.2rem 1.1rem;
}

.back {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
}

h1 {
  margin: 0.45rem 0 0.25rem;
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: 0.04em;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.studio {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  grid-template-columns: minmax(300px, 1fr) minmax(320px, 1.1fr);
}

.controls {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.34rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #8eb2d4;
}

input,
select,
button {
  width: 100%;
  border-radius: 10px;
  border: 1px solid #35587f;
  background: #091123;
  color: var(--text);
  font: inherit;
  font-size: 0.97rem;
  padding: 0.62rem 0.75rem;
}

input[type="range"] {
  padding: 0.28rem 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.stat {
  background: #091326;
  border: 1px solid #2f4e79;
  border-radius: 10px;
  padding: 0.52rem 0.6rem;
  display: grid;
  gap: 0.1rem;
}

.stat span {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #789fc4;
}

.stat strong {
  font-size: 1.03rem;
}

.actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.btn {
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: #90dbff;
}

.btn.ghost {
  background: #0a1730;
}

.btn.primary {
  background: linear-gradient(180deg, #41e2ff, #2872dc);
  border-color: #92ebff;
  color: #001227;
  font-weight: 700;
}

.monitor {
  display: grid;
  gap: 0.7rem;
}

.meter-wrap {
  position: relative;
  border: 2px solid #35587f;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(180deg, #04070f, #050a15);
}

#meter {
  width: 100%;
  height: auto;
  display: block;
  image-rendering: crisp-edges;
}

.scanlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0.06) 0px,
    rgba(255,255,255,0.06) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
  opacity: 0.34;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0.42rem;
}

.step {
  border: 1px solid #31527b;
  border-radius: 8px;
  background: #091325;
  min-height: 3rem;
  padding: 0.35rem;
  display: grid;
  align-content: center;
  gap: 0.15rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 120ms ease, transform 100ms ease, background 120ms ease;
}

.step:hover {
  transform: translateY(-1px);
  border-color: #8bdcff;
}

.step.active {
  background: linear-gradient(180deg, #26153d, #112645);
  border-color: #ff6ed2;
}

.step.playing {
  box-shadow: 0 0 0 1px rgba(255,255,255,0.35), 0 0 16px rgba(120, 255, 220, 0.45);
  border-color: var(--ok);
}

.step .idx {
  font-size: 0.62rem;
  color: #79a0c3;
}

.step .note {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.tips {
  padding: 0.8rem 1rem;
}

.tips ul {
  margin: 0;
  padding-left: 1.1rem;
  color: #a0c3e2;
  display: grid;
  gap: 0.34rem;
}

@media (max-width: 860px) {
  .studio {
    grid-template-columns: 1fr;
  }

  .actions,
  .row,
  .stats {
    grid-template-columns: 1fr;
  }

  .step-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}