:root {
  color-scheme: dark;
  --bg: #14100e;
  --wood: #3a2418;
  --wood-light: #5c3a26;
  --string: #e8d9b5;
  --accent: #d8a657;
  --lit: #ffd98e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--string);
  font-family: system-ui, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  width: min(900px, 92vw);
  text-align: center;
}

h1 {
  font-weight: 400;
  letter-spacing: 0.05em;
}

h1 span {
  font-size: 0.5em;
  color: var(--accent);
  display: block;
}

.hint {
  color: #a89a82;
  margin-bottom: 2rem;
}

.lute {
  background: var(--wood);
  border-radius: 24px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.string-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.string-label {
  width: 5.5rem;
  flex-shrink: 0;
  font-size: 0.85rem;
  color: var(--accent);
  text-align: right;
}

.frets {
  flex: 1;
  display: flex;
  gap: 0.4rem;
}

.fret {
  flex: 1;
  padding: 0.75rem 0.25rem;
  background: var(--wood-light);
  border: 1px solid #00000040;
  border-radius: 6px;
  font-size: 0.8rem;
  transition: background 0.06s, transform 0.06s;
}

.fret .key {
  display: block;
  font-weight: 600;
  text-transform: uppercase;
}

.fret .note {
  display: block;
  font-size: 0.65rem;
  color: #c9b896;
}

.fret.scale-note {
  border-color: var(--accent);
}

.fret.scale-note .note {
  color: var(--accent);
}

.fret.lit {
  background: var(--lit);
  color: #2a1a0e;
  transform: scale(0.95);
}

.status {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #77695570;
}

.songs {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.song-btn {
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--string);
  background: var(--wood-light);
  border: 1px solid #00000040;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s;
}

.song-btn:hover {
  border-color: var(--accent);
}

.song-btn.playing {
  background: var(--accent);
  color: #2a1a0e;
}

.song-btn.stop-btn {
  background: transparent;
  color: #a89a82;
}

.tone-controls {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.brightness-label {
  font-size: 0.8rem;
  color: #a89a82;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brightness-label input[type='range'] {
  accent-color: var(--accent);
}

.brightness-label input[type='text'] {
  font-family: inherit;
  font-size: 0.8rem;
  color: var(--string);
  background: var(--wood);
  border: 1px solid #00000040;
  border-radius: 4px;
  padding: 0.3rem 0.5rem;
  width: 14rem;
  max-width: 40vw;
}

.relay-hint {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: #77695570;
}

.relay-hint code {
  color: #a89a82;
}