.panel-header {
  align-items: center;
  background-color: var(--bg-surface);
  border-block-end: 1px solid var(--border-subtle);
  display: flex;
  flex-shrink: 0;
  justify-content: space-between;
  padding-block: var(--space-2);
  padding-inline: var(--space-4);
}

.panel-header-start {
  align-items: center;
  display: flex;
  gap: var(--space-2);
}

.panel-dot {
  block-size: 7px;
  border-radius: var(--radius-xl);
  flex-shrink: 0;
  inline-size: 7px;
}

.panel-dot--before {
  background-color: var(--diff-removed-text);
}

.panel-dot--after {
  background-color: var(--diff-added-text);
}

.panel-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel-label--before {
  color: var(--diff-removed-text);
}

.panel-label--after {
  color: var(--diff-added-text);
}

.panel-hint {
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

.css-editor {
  background-color: var(--bg-panel);
  border: none;
  caret-color: var(--accent);
  color: var(--text-primary);
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.8;
  min-block-size: 0;
  outline: none;
  overflow: auto;
  padding: var(--space-4);
  tab-size: 2;
  white-space: pre;
}

.css-editor::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.css-editor:focus {
  box-shadow: inset 2px 0 0 var(--accent);
}

/* Mobile: fixed height so textareas don't collapse */
@media (max-width: 1024px) {
  .css-editor {
    block-size: 280px;
    flex: none;
    min-block-size: 280px;
  }
}

@media (max-width: 640px) {
  .css-editor {
    block-size: 220px;
    min-block-size: 220px;
  }

  .panel-hint {
    display: none;
  }
}