*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0c0e14;
  --surface: #151922;
  --surface-2: #1e2430;
  --border: #2a3344;
  --text: #e8ecf4;
  --text-muted: #8b95a8;
  --accent: #5b8def;
  --accent-hover: #7aa3f5;
  --success: #3dd68c;
  --danger: #f07178;
  --radius: 10px;
  --font: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "SF Mono", "Fira Code", ui-monospace, monospace;
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 1.5rem;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.brand h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 0.15rem;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.2s, box-shadow 0.2s;
}

.status--live .status-dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.status--live {
  color: var(--success);
}

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.25rem;
  min-height: 0;
}

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }
}

.spectrogram-wrap {
  position: relative;
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 320px;
  aspect-ratio: 16 / 9;
}

#spectrogram {
  display: block;
  width: 100%;
  height: 100%;
}

.axis-label {
  position: absolute;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  pointer-events: none;
}

.axis-label--y {
  left: 0.5rem;
  top: 50%;
  transform: rotate(-90deg) translateX(-50%);
  transform-origin: left center;
}

.axis-label--x {
  right: 0.75rem;
  bottom: 0.4rem;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.control-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.control-group h2 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-hover);
}

.btn--stop {
  background: var(--danger);
}

.btn--stop:hover {
  background: #f58a90;
}

.btn-icon {
  font-size: 0.75rem;
}

.hint {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.hint--error {
  color: var(--danger);
}

.gradient-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.gradient-option {
  position: relative;
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 0;
  cursor: pointer;
  overflow: hidden;
  background: var(--surface-2);
  transition: border-color 0.15s;
}

.gradient-option:hover {
  border-color: var(--border);
}

.gradient-option[aria-checked="true"] {
  border-color: var(--accent);
}

.gradient-option:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.gradient-swatch {
  display: block;
  height: 28px;
  width: 100%;
}

.gradient-name {
  display: block;
  padding: 0.35rem 0.5rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

.field {
  display: block;
  margin-bottom: 0.75rem;
}

.field:last-child {
  margin-bottom: 0;
}

.field-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.field select {
  width: 100%;
  padding: 0.45rem 0.6rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
}

.field-value {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.field--checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.field--checkbox input {
  accent-color: var(--accent);
  width: 1rem;
  height: 1rem;
}

.stat-list {
  display: grid;
  gap: 0.5rem;
}

.stat-list div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8rem;
}

.stat-list dt {
  color: var(--text-muted);
}

.stat-list dd {
  font-family: var(--mono);
  font-size: 0.75rem;
}