:root {
  --bg: #0e1116;
  --panel: #171c24;
  --text: #e8edf2;
  --muted: #94a1b2;
  --accent: #82c8ff;
  --accent-2: #78dcaa;
  --radius: 14px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 50% -10%, #1a2230, var(--bg));
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header {
  text-align: center;
  margin-bottom: 16px;
}

h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.5px;
}

.tagline {
  margin: 4px 0 0;
  color: var(--muted);
}

.stage {
  position: relative;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.chord-display {
  text-align: center;
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chord-display span {
  font-size: clamp(48px, 16vw, 112px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent-2);
  text-shadow: 0 0 40px rgba(120, 220, 170, 0.25);
}

#ribbon {
  display: block;
  width: 100%;
  height: 240px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
}

.controls {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 18px;
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 18px;
}

button.primary {
  background: var(--accent);
  color: #06131f;
  font-weight: 600;
  width: 100%;
  font-size: 1.1rem;
}

button.ghost {
  background: transparent;
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

.status {
  color: var(--muted);
  margin: 10px 0 18px;
  text-align: center;
  min-height: 1.4em;
}

.row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.row > label {
  width: 56px;
  color: var(--muted);
}

.row input[type="range"] {
  flex: 1;
  min-width: 140px;
}

select {
  font: inherit;
  background: #0e131a;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 8px 10px;
}

.key-readout {
  color: var(--muted);
}

label.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: auto;
  color: var(--text);
  cursor: pointer;
}
label.check input {
  width: 16px;
  height: 16px;
}
.key-readout strong {
  color: var(--accent-2);
}

.mix {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 8px;
}

.mix label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

footer {
  margin-top: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  .mix {
    grid-template-columns: repeat(2, 1fr);
  }
  #ribbon {
    height: 200px;
  }
}