/* Multi-Frequency Mixer — 4-osc tone mixer + chord/DTMF/beats presets */

/* ── Tool grid ── */
.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}
.tool-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.panel-title {
  font-family: var(--font-display);
  font-size: var(--fs-base);
  color: var(--color-primary);
  margin: 0 0 var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Inputs ── */
.input-group { margin-bottom: var(--space-md); }
.input-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
  font-family: var(--font-mono);
  gap: var(--space-sm);
}
.control-label__val {
  font-family: var(--font-mono);
  color: var(--color-secondary);
  font-weight: 600;
  white-space: nowrap;
}
.input-hint {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-top: 4px;
  font-style: italic;
}
.control-slider { width: 100%; accent-color: var(--color-primary); cursor: pointer; }

/* ── Per-osc row ── */
.mfg-osc {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-sm);
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: var(--space-md);
  transition: opacity 0.2s, border-color 0.2s;
}
.mfg-osc.is-muted { opacity: 0.55; }
.mfg-osc.is-muted .mfg-mute { background: var(--color-bg); color: var(--color-text-muted); }

.mfg-mute {
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: #0a0a0a;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  letter-spacing: 0.04em;
  padding: 0 8px;
  align-self: stretch;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.mfg-mute:hover { box-shadow: 0 0 10px color-mix(in srgb, var(--color-primary) 35%, transparent); }

.mfg-osc__ctrls { display: flex; flex-direction: column; gap: 6px; }
.mfg-osc__label {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
}
.mfg-osc__name {
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.mfg-freq-val {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-secondary);
  font-variant-numeric: tabular-nums;
}
.mfg-note-val {
  color: var(--color-primary);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.mfg-osc__amp-row {
  display: grid;
  grid-template-columns: 84px 1fr 56px;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}
.mfg-osc__sub {
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.mfg-amp-val {
  text-align: right;
  color: var(--color-secondary);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.mfg-wave {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-secondary);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  padding: 6px 8px;
  cursor: pointer;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--color-primary) 50%),
                    linear-gradient(135deg, var(--color-primary) 50%, transparent 50%);
  background-position: calc(100% - 14px) 50%, calc(100% - 9px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 26px;
}
.mfg-wave:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }

/* ── Preset select + master + status ── */
.mfg-preset-select {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-secondary);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: 10px 30px 10px 12px;
  cursor: pointer;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--color-primary) 50%),
                    linear-gradient(135deg, var(--color-primary) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 12px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.mfg-preset-select:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.mfg-preset-select option { background: #0a0a0a; color: var(--color-secondary); }

.mfg-status {
  margin-top: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}
.btn.is-playing {
  background: #ff4488;
  border-color: #ff4488;
  color: #0a0a0a;
  position: relative;
}
.btn.is-playing::before {
  content: '';
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #fff;
  margin-right: 6px;
  vertical-align: middle;
  animation: mfg-pulse 1.2s ease-in-out infinite;
}
@keyframes mfg-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}

/* ── Cells (live readouts) ── */
.mfg-cells {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.mfg-cell {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  text-align: center;
}
.mfg-cell__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.mfg-cell__value {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-secondary);
  line-height: 1.2;
  margin: 4px 0 2px;
  font-variant-numeric: tabular-nums;
}
.mfg-cell__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

/* ── Plot ── */
.plot-stack { display: grid; gap: var(--space-md); margin-bottom: var(--space-xl); }
.plot-wrap {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}
.plot-title {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
  font-family: var(--font-mono);
}
.plot-svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 820px;
  margin: 0 auto;
}

/* ── Content / FAQ / Related ── */
.content-section {
  max-width: 800px;
  margin: 0 auto var(--space-lg);
  color: var(--color-text);
  line-height: 1.7;
}
.content-section h3 {
  color: var(--color-secondary);
  font-family: var(--font-display);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
  font-size: var(--fs-md);
}
.content-section p { margin-bottom: var(--space-sm); }
.content-section ul { margin: var(--space-sm) 0 var(--space-sm) var(--space-lg); }
.content-section li { margin-bottom: 4px; }

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}
.faq-question {
  padding: var(--space-md);
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-bright);
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after { content: '+'; color: var(--color-primary); font-size: 1.3em; font-weight: 700; }
details[open] .faq-question::after { content: '−'; }
.faq-answer {
  padding: 0 var(--space-md) var(--space-md);
  color: var(--color-text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-sm);
}

.related-tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 900px;
  margin: 0 auto;
}
.related-tool-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
  text-align: left;
}
.related-tool-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.related-tool-card__title {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}
.related-tool-card__desc {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .tool-grid { grid-template-columns: 1fr; }
  .related-tools-grid { grid-template-columns: 1fr; }
  .mfg-cells { grid-template-columns: 1fr; }
  .mfg-osc { grid-template-columns: 1fr; }
  .mfg-mute { padding: 8px 12px; }
  .mfg-osc__amp-row { grid-template-columns: 70px 1fr 50px; }
}