.properties-panel {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm, 8px);
  padding: var(--spacing-sm, 8px);
  font-family: var(--font-family, sans-serif);
  font-size: var(--font-size-md, 14px);
  color: var(--text, #333);
}

/* ── Empty state ─────────────────────────────────────────────── */

.properties-panel-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  padding: var(--spacing-lg, 24px);
  text-align: center;
}

.properties-panel-empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md, 16px);
  opacity: 0.5;
}

.properties-panel-empty-text {
  color: var(--text-secondary, #888);
  font-size: var(--font-size-sm, 12px);
  line-height: 1.5;
  max-width: 220px;
}

/* ── Header ──────────────────────────────────────────────────── */

.properties-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xs, 4px) var(--spacing-sm, 8px);
  background-color: var(--surface-hover, rgba(0, 0, 0, 0.04));
  border-radius: var(--border-radius, 4px);
  margin-bottom: var(--spacing-xs, 4px);
}

.properties-panel-type-badge {
  font-weight: var(--font-weight-bold, 700);
  font-size: var(--font-size-sm, 12px);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary, #2563eb);
}

.properties-panel-id {
  font-size: var(--font-size-xs, 10px);
  color: var(--text-secondary, #888);
  font-family: monospace;
}

/* ── Fieldsets ───────────────────────────────────────────────── */

.properties-panel-fieldset {
  border: 1px solid var(--border, #e0e0e0);
  border-radius: var(--border-radius, 4px);
  padding: var(--spacing-sm, 8px);
  margin: 0;
}

.properties-panel-fieldset legend {
  font-weight: var(--font-weight-medium, 500);
  font-size: var(--font-size-sm, 12px);
  color: var(--text-secondary, #666);
  padding: 0 var(--spacing-xs, 4px);
}

/* ── Rows ────────────────────────────────────────────────────── */

.properties-panel-row {
  display: flex;
  gap: var(--spacing-sm, 8px);
}

.properties-panel-row > * {
  flex: 1;
}

/* ── Labels ──────────────────────────────────────────────────── */

.properties-panel-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--spacing-xs, 4px);
  font-size: var(--font-size-sm, 12px);
  color: var(--text-secondary, #666);
}

/* ── Inputs ──────────────────────────────────────────────────── */

.properties-panel-input,
.properties-panel-text-input,
.properties-panel-select {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid var(--border, #ccc);
  border-radius: var(--border-radius, 4px);
  background-color: var(--background, #fff);
  color: var(--text, #333);
  font-size: var(--font-size-md, 14px);
  font-family: var(--font-family, sans-serif);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
}

.properties-panel-input:focus,
.properties-panel-text-input:focus,
.properties-panel-select:focus {
  outline: none;
  border-color: var(--primary, #2563eb);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.properties-panel-input[type="number"] {
  -moz-appearance: textfield;
}

.properties-panel-input[type="number"]::-webkit-inner-spin-button,
.properties-panel-input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* ── Color inputs ────────────────────────────────────────────── */

.properties-panel-color-input {
  width: 100%;
  height: 28px;
  padding: 2px;
  border: 1px solid var(--border, #ccc);
  border-radius: var(--border-radius, 4px);
  background-color: var(--background, #fff);
  cursor: pointer;
  box-sizing: border-box;
}

.properties-panel-color-input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.properties-panel-color-input::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.properties-panel-text-input {
  margin-top: 2px;
  font-size: var(--font-size-xs, 11px);
  font-family: monospace;
}

/* ── Select ──────────────────────────────────────────────────── */

.properties-panel-select {
  cursor: pointer;
  appearance: auto;
}

/* ── Responsive ──────────────────────────────────────────────── */

@media (max-width: 768px) {
  .properties-panel {
    padding: var(--spacing-xs, 4px);
  }

  .properties-panel-row {
    flex-direction: column;
  }
}