*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: #0f0f12;
  color: #d6d6d6;
  font-family: system-ui, sans-serif;
  font-size: 14px;
}

/* ── TOP BAR ── */
.top-bar {
  padding: 12px 16px;
  background: #1a1a1f;
  border-bottom: 1px solid #2a2a2a;
}

.top-bar h1 {
  margin: 0 0 10px;
  font-size: 16px;
  color: #eee;
  letter-spacing: 0.5px;
}

.top-bar-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.transport {
  display: flex;
  gap: 8px;
}

.source {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── BUTTONS ── */
button {
  background: #2b2b33;
  color: #ddd;
  border: 1px solid #3a3a3a;
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 6px;
  font-size: 13px;
  touch-action: manipulation;
  min-height: 38px;
}

button:hover { background: #3a3a45; }
button:active { opacity: 0.8; }

button.active {
  background: #4a9eff;
  border-color: #4a9eff;
  color: #000;
  font-weight: 600;
}

/* ── SELECT ── */
select {
  background: #2b2b33;
  color: #ddd;
  border: 1px solid #3a3a3a;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
  min-height: 38px;
  touch-action: manipulation;
}

/* ── SOURCE CONTROLS ── */
.source-controls {
  background: #16161b;
  border-bottom: 1px solid #2a2a2a;
  padding: 14px 16px;
  min-height: 54px;
}

.ctrl-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ctrl-panel.hidden { display: none; }

.ctrl-group {
  display: grid;
  grid-template-columns: 90px 1fr 60px;
  align-items: center;
  gap: 10px;
}

.ctrl-group label {
  font-size: 12px;
  color: #888;
  white-space: nowrap;
}

.ctrl-group span {
  font-size: 12px;
  color: #aaa;
  text-align: right;
}

/* btn-group inside ctrl-group spans all columns */
.ctrl-group .btn-group {
  grid-column: 2 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ctrl-group:has(.btn-group) {
  grid-template-columns: 90px 1fr;
}

/* ── RANGE INPUTS ── */
input[type="range"] {
  accent-color: #4a9eff;
  width: 100%;
  height: 6px;
  cursor: pointer;
  touch-action: manipulation;
}

/* ── MIXER ── */
.mixer {
  background: #141418;
  padding: 14px 16px;
  border-bottom: 1px solid #2a2a2a;
}

.channel {
  display: grid;
  grid-template-columns: 90px 1fr 50px;
  align-items: center;
  gap: 10px;
}

.channel label {
  font-size: 12px;
  color: #888;
}

.gain-value {
  font-size: 12px;
  color: #aaa;
  text-align: right;
}

/* ── WORKSPACE ── */
.workspace {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.visual {
  background: #111;
  border: 1px solid #2a2a2a;
  border-radius: 6px;
  padding: 8px;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 160px;
}

/* ── DESKTOP ── */
@media (min-width: 640px) {
  .top-bar h1 { margin-bottom: 0; }

  .top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
  }

  .ctrl-panel {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 24px;
  }

  .ctrl-group {
    display: flex;
    align-items: center;
    gap: 8px;
    grid-template-columns: unset;
  }

  .ctrl-group label { min-width: 70px; }
  .ctrl-group span  { min-width: 60px; text-align: left; }

  .ctrl-group .btn-group { grid-column: unset; }
  .ctrl-group:has(.btn-group) { grid-template-columns: unset; }

  input[type="range"] { width: 150px; }

  .channel {
    display: flex;
    align-items: center;
    gap: 10px;
    width: auto;
  }

  .workspace {
    grid-template-columns: 1fr 1fr;
  }

  canvas { height: 200px; }
}