:root {
  --bg: #0b0f12;
  --surface: #182128;
  --surface-2: #22313d;
  --text: #ecf3f8;
  --muted: #9fb3c2;
  --accent: #ffb14a;
  --danger: #f97171;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px circle at top right, #1d2b36 0%, var(--bg) 50%);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.app {
  width: min(900px, 100%);
  margin: 0 auto;
  padding: 24px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 2rem;
}

header p {
  margin: 0 0 16px;
  color: var(--muted);
}

.panel {
  background: linear-gradient(170deg, var(--surface), var(--surface-2));
  border: 1px solid #2e404f;
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
}

.media-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.media-controls button {
  min-width: 88px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.control-label {
  display: inline-block;
  color: var(--muted);
  margin-bottom: 6px;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.value-chip {
  min-width: 40px;
  text-align: center;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid #3b5164;
  background: #0f161c;
}

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.switch-row input[type="checkbox"] {
  width: 44px;
  height: 24px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
}

input,
select,
button {
  font: inherit;
}

input,
select {
  border: 1px solid #3b5164;
  border-radius: 8px;
  background: #0f161c;
  color: var(--text);
  padding: 8px 10px;
}

button {
  border: 0;
  border-radius: 8px;
  color: #111;
  background: var(--accent);
  padding: 8px 12px;
  margin-right: 8px;
  cursor: pointer;
}

.toggle-btn {
  background: #c2ccd3;
}

.toggle-btn.active {
  background: var(--accent);
}

#audioState {
  display: inline-block;
  width: 100%;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.file input {
  margin-top: 6px;
}

.status pre {
  margin: 6px 0;
  white-space: pre-wrap;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.channel-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.channel-row strong {
  color: var(--accent);
}

.channel-row label {
  color: var(--muted);
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 700px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .channel-grid {
    grid-template-columns: 1fr;
  }
}