:root {
  --bg: #f6f4ef;
  --panel: #ffffff;
  --text: #1f1d1a;
  --muted: #6b665d;
  --line: #ddd8cc;
  --accent: #8a4b14;
  --accent-soft: #f3e4d3;
  --warn: #b3261e;
  --white-key: #fffdf8;
  --black-key: #1c1a17;
  --key-down: #e0a060;
  --key-down-black: #a8641f;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171614;
    --panel: #221f1c;
    --text: #ece7de;
    --muted: #a39d91;
    --line: #3a3530;
    --accent: #e0a060;
    --accent-soft: #3a2a1a;
    --warn: #f28b82;
    --white-key: #e9e4d8;
    --black-key: #0d0c0b;
    --key-down: #e0a060;
    --key-down-black: #c07a30;
  }
}
:root[data-theme="dark"] {
  --bg: #171614;
  --panel: #221f1c;
  --text: #ece7de;
  --muted: #a39d91;
  --line: #3a3530;
  --accent: #e0a060;
  --accent-soft: #3a2a1a;
  --warn: #f28b82;
  --white-key: #e9e4d8;
  --black-key: #0d0c0b;
  --key-down: #e0a060;
  --key-down-black: #c07a30;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px 8px;
  max-width: 1280px;
  margin: 0 auto;
}
h1 { margin: 0; font-size: 1.6rem; font-weight: 650; }
h2 { margin: 0 0 8px; font-size: 1.2rem; }
h3 { margin: 0; font-size: 1.05rem; }
header p { margin: 4px 0 0; color: var(--muted); }
main { max-width: 1280px; margin: 0 auto; padding: 0 24px 40px; }
section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 12px 0;
}
button, select, input[type="range"] { font: inherit; }
button, select {
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--panel); font-weight: 600; }
.lang button[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); }

.transport { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; }
.status { color: var(--muted); min-width: 6em; }
.meters { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-left: auto; }
.meter { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.9rem; }
.bar { width: 110px; height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.bar > div { height: 100%; width: 0; background: var(--accent); transition: width 0.15s; }
.bar > div.over { background: var(--warn); }
.value { font-variant-numeric: tabular-nums; color: var(--text); min-width: 3.2em; display: inline-block; }
.warning { color: var(--warn); margin: 0; flex-basis: 100%; }

.options { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; margin-bottom: 10px; }
.options label { display: flex; align-items: center; gap: 8px; }
.options label.wide input { width: 160px; }
.activity { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.activity.on { background: var(--accent); }
.midi-message { color: var(--muted); font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.pedal { margin-left: auto; }
.pedal.down { background: var(--accent); color: var(--panel); border-color: var(--accent); }

.keyboard-scroll { overflow-x: auto; padding-bottom: 4px; }
.keyboard {
  position: relative;
  height: 150px;
  user-select: none;
  touch-action: none;
}
.key { position: absolute; top: 0; border: 1px solid var(--line); }
.key.white {
  height: 150px;
  background: var(--white-key);
  border-color: #b9b2a3;
  border-radius: 0 0 5px 5px;
  z-index: 1;
}
.key.black {
  height: 92px;
  background: var(--black-key);
  border-color: var(--black-key);
  border-radius: 0 0 3px 3px;
  z-index: 2;
}
.key.white.down { background: var(--key-down); }
.key.black.down { background: var(--key-down-black); }
.key .label {
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 10px;
  color: #6b665d;
  pointer-events: none;
}
.key.black .label { color: #c9c2b4; bottom: 3px; }
.key .label.computer { bottom: 18px; color: var(--accent); font-weight: 600; }
.key.black .label.computer { bottom: 16px; color: #e0a060; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 6px 0 0; }

.controls-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  margin: 6px 0 12px;
}
.tabs [role="tab"] {
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 14px;
  margin-bottom: -1px;
}
.tabs [role="tab"][aria-selected="true"] {
  color: var(--text);
  background: var(--panel);
  border-color: var(--line);
  border-bottom: 1px solid var(--panel);
  font-weight: 600;
}
.group-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.group-intro { color: var(--muted); font-size: 0.9rem; margin: 0 0 8px; max-width: 75ch; }
.group-controls { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 0 24px; }
.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.preset { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
.preset.active { border-color: var(--accent); background: var(--accent-soft); }
.preset-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.preset-head h3 { font-size: 1rem; }
.badge { font-size: 0.75rem; font-weight: 500; color: var(--accent); border: 1px solid var(--accent); border-radius: 10px; padding: 0 6px; vertical-align: middle; }
.control { padding: 8px 0; border-top: 1px solid var(--line); }
.control-row { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; align-items: center; }
.control-name { font-weight: 600; font-size: 0.95rem; }
.control-name code { font-weight: 400; color: var(--muted); font-size: 0.8rem; margin-left: 6px; }
.control-value { font-variant-numeric: tabular-nums; font-size: 0.9rem; }
.control-value.changed { color: var(--accent); font-weight: 600; }
.control input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); }
.control-help { color: var(--muted); font-size: 0.85rem; margin: 2px 0 0; }
.control-range { color: var(--muted); font-size: 0.78rem; }

.how p, .how li { color: var(--text); }
.how code { font-size: 0.88em; }

@media (max-width: 640px) {
  header, main { padding-left: 16px; padding-right: 16px; }
  .group-controls { grid-template-columns: 1fr; }
  .group-head { flex-direction: column; }
  .meters { margin-left: 0; }
  .pedal { margin-left: 0; }
}