/* ==================== SIGNAL SETTINGS PANEL ==================== */

.signal-settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.signal-settings-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.signal-settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 560px;
  max-width: 100vw;
  background: var(--apex-panel);
  border-left: 1px solid var(--apex-border);
  box-shadow: -16px 0 48px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.signal-settings-overlay.visible .signal-settings-panel {
  transform: translateX(0);
}

.signal-settings-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--apex-border);
  flex-shrink: 0;
}

.signal-settings-header h4 {
  margin: 0;
  color: #F1F8F4;
  font-size: 1.15rem;
}

.signal-settings-subtitle {
  margin: 0.25rem 0 0;
  color: var(--apex-muted);
  font-size: 0.8rem;
}

.signal-settings-toolbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--apex-border);
  flex-shrink: 0;
}

.signal-settings-toolbar .form-control {
  flex: 1;
}

.signal-settings-toolbar .form-select {
  width: auto;
  min-width: 150px;
}

.signal-settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0;
}

.signal-settings-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--apex-border);
  flex-shrink: 0;
}

.signal-settings-footer-left {
  display: flex;
  gap: 0.5rem;
}

/* Signal Category Groups */
.signal-category-group {
  margin-bottom: 0.25rem;
}

.signal-category-header {
  padding: 0.6rem 1.5rem 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--apex-primary);
  position: sticky;
  top: 0;
  background: var(--apex-panel);
  z-index: 1;
}

/* Signal Items */
.signal-item {
  border-bottom: 1px solid rgba(157, 181, 168, 0.08);
  transition: background 0.15s ease;
}

.signal-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.signal-item--modified {
  border-left: 3px solid var(--apex-primary);
}

.signal-item-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.55rem 1.5rem;
  cursor: pointer;
  user-select: none;
  gap: 1rem;
}

.signal-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
  flex: 1;
}

.signal-item-name {
  color: #E6F0EA;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.signal-item-key {
  color: var(--apex-muted);
  font-size: 0.72rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
  opacity: 0.7;
}

.signal-item-badges {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

.signal-item-value {
  color: #F1F8F4;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  min-width: 50px;
  text-align: right;
}

.signal-item-unit {
  color: var(--apex-muted);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--apex-border);
}

.signal-item-badge-modified {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #34D6A0;
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  background: rgba(52, 214, 160, 0.1);
  border: 1px solid rgba(52, 214, 160, 0.25);
}

.signal-expand-chevron {
  color: var(--apex-muted);
  font-size: 0.75rem;
  transition: transform 0.2s ease;
  display: inline-block;
}

.signal-item.expanded .signal-expand-chevron {
  transform: rotate(90deg);
}

/* Signal Item Details (expanded) */
.signal-item-details {
  display: none;
  padding: 0.5rem 1.5rem 1rem;
  background: rgba(255, 255, 255, 0.015);
  border-top: 1px solid rgba(157, 181, 168, 0.06);
  animation: slideDown 0.2s ease;
}

.signal-item.expanded .signal-item-details {
  display: block;
}

.signal-preset-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.signal-preset-row label {
  font-size: 0.78rem;
  color: var(--apex-muted);
  font-weight: 500;
  white-space: nowrap;
}

.signal-preset-row .form-select {
  flex: 1;
}

.signal-fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.signal-field {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.signal-field label {
  font-size: 0.72rem;
  color: var(--apex-muted);
  font-weight: 500;
}

.signal-item-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.signal-empty {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--apex-muted);
  font-size: 0.9rem;
}

/* Signal settings button styling */
#signal-settings-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

@media (max-width: 640px) {
  .signal-settings-panel {
    width: 100vw;
  }

  .signal-fields-grid {
    grid-template-columns: 1fr 1fr;
  }

  .signal-settings-toolbar {
    flex-direction: column;
  }

  .signal-settings-toolbar .form-select {
    width: 100%;
  }

  .signal-settings-footer {
    flex-direction: column;
    gap: 0.75rem;
  }

  .signal-settings-footer-left {
    width: 100%;
    justify-content: center;
  }
}