/* A4 Tuning Frequency Tool Styles */

/* A4 Control Panel */
.a4-control-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.a4-hz-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}
.a4-hz-label {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-text-muted);
}
.a4-hz-value {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--color-primary);
  line-height: 1;
  text-shadow: 0 0 20px color-mix(in srgb, var(--color-primary) 40%, transparent);
}
.a4-hz-unit {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--color-text-muted);
}

.a4-slider-row {
  max-width: 500px;
  margin: 0 auto var(--space-md);
}
.a4-slider-row .input-label {
  text-align: left;
}

.a4-play-row {
  margin-top: var(--space-md);
}

/* Shared input styles */
.input-label {
  display: block;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
  font-family: var(--font-mono);
}
.input-field {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--fs-base);
  padding: var(--space-xs) var(--space-sm);
  box-sizing: border-box;
  transition: border-color 0.2s;
}
.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
}
.input-with-unit {
  display: flex;
  gap: var(--space-xs);
}
.input-with-unit .input-field {
  flex: 1;
}
.unit-badge {
  display: flex;
  align-items: center;
  padding: 0 var(--space-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Slider */
.slider-wrap {
  margin-top: var(--space-xs);
}
.slider {
  width: 100%;
  accent-color: var(--color-primary);
  cursor: pointer;
  height: 6px;
}
.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* Preset Buttons */
.preset-section {
  margin-bottom: var(--space-lg);
}
.preset-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
}
.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-xs);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
}
.preset-btn:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.preset-btn--active {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
}
.preset-hz {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-primary);
}
.preset-name {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-align: center;
}

/* Table Sections */
.table-section {
  margin-bottom: var(--space-xl);
}
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}
.data-table thead {
  position: sticky;
  top: 0;
  z-index: 10;
}
.data-table th {
  background: var(--color-surface);
  color: var(--color-primary);
  padding: var(--space-xs) var(--space-sm);
  text-align: left;
  border-bottom: 2px solid var(--color-border);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.data-table td {
  padding: var(--space-xs) var(--space-sm);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent);
  color: var(--color-text);
  white-space: nowrap;
}
.data-table tr:hover td {
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
}
.data-table tr.highlight-row td {
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
}
.data-table tr.highlight-row td:first-child {
  color: var(--color-primary);
  font-weight: 600;
}

/* Playing row glow */
.data-table tr.playing td {
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  box-shadow: inset 0 0 20px color-mix(in srgb, var(--color-primary) 10%, transparent);
}
@keyframes playGlow {
  0%, 100% { box-shadow: inset 0 0 10px color-mix(in srgb, var(--color-primary) 10%, transparent); }
  50% { box-shadow: inset 0 0 25px color-mix(in srgb, var(--color-primary) 20%, transparent); }
}
.data-table tr.playing td:first-child {
  animation: playGlow 1s ease-in-out infinite;
}

/* Play / Copy buttons in table */
.play-btn {
  padding: 3px 10px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  cursor: pointer;
  transition: all 0.2s;
}
.play-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.play-btn.playing-btn {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
}

/* Diff positive / negative */
.diff-positive {
  color: #00ff41;
}
.diff-negative {
  color: #ff6b6b;
}
.diff-zero {
  color: var(--color-text-muted);
}

/* Comparison Section */
.comparison-section {
  margin-bottom: var(--space-xl);
}
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}
.comparison-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.comparison-card__title {
  font-family: var(--font-display);
  font-size: var(--fs-base);
  color: var(--color-primary);
  margin: 0 0 var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.comparison-card__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}
.comparison-play-btns {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.compare-play-btn {
  flex: 1;
  min-width: 100px;
}

/* Cents Calculator */
.cents-calc {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.cents-inputs {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
}
.cents-input-group {
  flex: 1;
}
.cents-vs {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  padding-bottom: var(--space-xs);
  font-size: var(--fs-sm);
}
.cents-result {
  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-sm);
  color: var(--color-text);
  text-align: center;
}
.cents-result strong {
  color: var(--color-primary);
}

/* Historical Timeline */
.timeline-section {
  margin-bottom: var(--space-xl);
}
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), color-mix(in srgb, var(--color-primary) 30%, transparent));
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-lg);
}
.timeline-item:last-child {
  margin-bottom: 0;
}
.timeline-marker {
  position: absolute;
  left: -33px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 8px color-mix(in srgb, var(--color-primary) 50%, transparent);
}
.timeline-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}
.timeline-era {
  font-family: var(--font-display);
  font-size: var(--fs-base);
  color: var(--color-primary);
  margin-bottom: 4px;
}
.timeline-pitch {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}
.timeline-desc {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Panel title */
.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;
}

/* Action buttons */
.action-btns {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-lg);
}

/* Content sections */
.content-section h2 {
  color: var(--color-primary);
  font-family: var(--font-display);
  margin-bottom: var(--space-md);
}
.content-section h3 {
  color: var(--color-secondary);
  margin: var(--space-lg) 0 var(--space-sm);
}
.content-list {
  padding-left: var(--space-lg);
  line-height: 1.8;
}
.content-list li {
  margin-bottom: var(--space-sm);
}

/* Related tools grid */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 700px;
  margin: 0 auto;
}
.related-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 0.2s;
}
.related-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.related-icon {
  font-size: 2rem;
}
.related-name {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-text);
  text-align: center;
}

/* FAQ */
.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;
}
.faq-question::-webkit-details-marker {
  display: none;
}
.faq-question::after {
  content: '+';
  color: var(--color-primary);
  font-size: 1.2em;
}
details[open] .faq-question::after {
  content: '\2212';
}
.faq-answer {
  padding: 0 var(--space-md) var(--space-md);
  color: var(--color-text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
}

/* Responsive */
@media (max-width: 768px) {
  .a4-hz-value {
    font-size: 3rem;
  }
  .preset-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  .cents-inputs {
    flex-direction: column;
    align-items: stretch;
  }
  .cents-vs {
    text-align: center;
    padding-bottom: 0;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .data-table {
    font-size: 11px;
  }
  .data-table th, .data-table td {
    padding: 4px 6px;
  }
  .timeline {
    padding-left: 30px;
  }
  .timeline::before {
    left: 10px;
  }
  .timeline-marker {
    left: -28px;
    width: 10px;
    height: 10px;
  }
}

@media (max-width: 480px) {
  .a4-hz-value {
    font-size: 2.5rem;
  }
  .preset-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .comparison-play-btns {
    flex-direction: column;
  }
  .action-btns {
    flex-direction: column;
    align-items: stretch;
  }
}