/* Low Frequency Noise Detector — tool-specific overrides only.
   Shared tokens/components live in design-system.css. Prefix: lfn */

.lfn-warn-note {
  max-width: 820px;
  margin: var(--space-md) auto 0;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-warning);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-sm);
  background: rgba(255, 179, 0, 0.07);
  color: #ffd479;
  font-size: 0.9rem;
  line-height: 1.55;
  text-align: left;
}
.lfn-warn-note strong { color: #ffd479; }

.lfn-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-lg);
}
@media (max-width: 860px) {
  .lfn-grid { grid-template-columns: 1fr; }
}

.lfn-select,
.lfn-num {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.lfn-select:focus,
.lfn-num:focus { outline: 1px solid var(--color-primary); }

.lfn-status {
  margin-top: var(--space-md);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-dim);
  min-height: 1.2em;
}
.lfn-status.is-live { color: var(--color-primary); border-color: rgba(0, 255, 65, 0.4); }
.lfn-status.is-error { color: var(--color-error); border-color: rgba(255, 23, 68, 0.4); }

/* Segmented control (mains frequency) */
.lfn-seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.lfn-seg__btn {
  padding: 10px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.lfn-seg__btn:hover { color: var(--color-text); }
.lfn-seg__btn--on {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(0, 255, 65, 0.08);
}

/* Calibration state line */
.lfn-cal-state {
  margin-top: var(--space-md);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--color-text-dim);
}
.lfn-cal-state.is-set {
  border-color: rgba(0, 230, 118, 0.4);
  background: rgba(0, 230, 118, 0.06);
  color: var(--color-text);
}
.lfn-cal-state strong { color: var(--color-success); }

/* Spectrum canvas */
.lfn-canvas {
  display: block;
  width: 100%;
  height: 280px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #020308;
}

/* Live readout below the spectrum */
.lfn-readout {
  margin-top: var(--space-md);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: rgba(0, 255, 65, 0.03);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text-dim);
  text-align: center;
}
.lfn-readout[data-on="true"] {
  border-color: rgba(0, 255, 65, 0.4);
  background: rgba(0, 255, 65, 0.07);
}
.lfn-readout strong { color: var(--color-primary); font-variant-numeric: tabular-nums; }

/* Band breakdown */
.lfn-bands {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}
@media (max-width: 480px) {
  .lfn-bands { grid-template-columns: 1fr; }
}
.lfn-band {
  text-align: center;
  padding: var(--space-md) 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: rgba(0, 255, 65, 0.02);
}
.lfn-band__name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
}
.lfn-band__range {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted, var(--color-text-dim));
  margin-top: 2px;
}
.lfn-band__val {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--color-secondary);
  font-variant-numeric: tabular-nums;
}
.lfn-band__note {
  margin-top: 4px;
  font-size: 0.68rem;
  color: var(--color-text-dim);
}
/* low-end bands are the unreliable ones — warn-tint their note */
#band-infra .lfn-band__note,
#band-sub .lfn-band__note { color: var(--color-warning); }
#band-hum .lfn-band__note { color: var(--color-success); }

/* Mains-hum verdict */
.lfn-hum {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--color-text-dim);
}
.lfn-hum.is-detected {
  border-color: var(--color-warning);
  background: rgba(255, 179, 0, 0.07);
  color: #ffd479;
}
.lfn-hum__detail {
  margin-top: 6px;
  font-family: var(--font-body, Inter, sans-serif);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--color-text-dim);
}