/* Frequency Sweep Generator — sweep config + sliding-marker visualisation */

/* ── 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; }

/* ── Chip rows (duration / mode / loop) ── */
.fsg-chip-row {
  display: grid;
  gap: 6px;
  margin-top: 4px;
}
#dur-btns.fsg-chip-row  { grid-template-columns: repeat(4, 1fr); }
#mode-btns.fsg-chip-row { grid-template-columns: repeat(2, 1fr); }
#loop-btns.fsg-chip-row { grid-template-columns: repeat(3, 1fr); }

.fsg-chip {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 6px;
  color: var(--color-secondary);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  letter-spacing: 0.04em;
  transition: border-color 0.15s, color 0.15s, background 0.15s, box-shadow 0.15s;
}
.fsg-chip:hover,
.fsg-chip:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
  outline: none;
}
.fsg-chip.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #0a0a0a;
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-primary) 35%, transparent);
}

/* ── Preset row ── */
.fsg-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}
.fsg-preset {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 4px;
  color: var(--color-secondary);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  line-height: 1.3;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.fsg-preset:hover,
.fsg-preset:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
  outline: none;
}
.fsg-preset__sub {
  display: block;
  margin-top: 2px;
  font-size: 0.62rem;
  color: var(--color-text-muted);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Play button & status ── */
.fsg-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: fsg-pulse 1.2s ease-in-out infinite;
}
@keyframes fsg-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}

/* ── Cells (live readouts) ── */
.fsg-cells {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.fsg-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;
}
.fsg-cell__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.fsg-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;
}
.fsg-cell__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

/* ── Threshold capture row ── */
.fsg-blurb {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: var(--space-sm);
}
.fsg-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
#mark-btn[disabled] { opacity: 0.45; cursor: not-allowed; }

/* ── 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;
}
.fsg-legend {
  text-transform: none;
  letter-spacing: 0;
  font-style: italic;
  margin-right: 6px;
  white-space: nowrap;
}
.fsg-legend--green { color: var(--color-primary); }
.fsg-legend--cyan  { color: var(--color-secondary); }
.fsg-legend--gold  { color: #ffd700; }

/* ── 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; }
  .fsg-cells { grid-template-columns: 1fr; }
  .fsg-presets { grid-template-columns: repeat(2, 1fr); }
  .fsg-row { grid-template-columns: 1fr; }
  #loop-btns.fsg-chip-row { grid-template-columns: 1fr; }
}