/* ============================================================
   Preview Panel — Before/after comparison
   ============================================================ */

.preview-panel {
  display: none;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.preview-panel.active {
  display: block;
}

.preview-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.preview-panel__title {
  font-weight: 600;
  font-size: 0.9375rem;
}

.preview-panel__comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

@media (max-width: 640px) {
  .preview-panel__comparison {
    grid-template-columns: 1fr;
  }
}

.preview-panel__side {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview-panel__side:first-child {
  border-right: 1px solid var(--color-border);
}

@media (max-width: 640px) {
  .preview-panel__side:first-child {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
}

.preview-panel__label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.preview-panel__label .badge {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  text-transform: none;
  letter-spacing: 0;
}

.badge-original {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
}

.badge-compressed {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.preview-panel__image-wrap {
  max-width: 100%;
  max-height: 400px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-panel__image-wrap img {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
}

.preview-panel__meta {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-align: center;
}

.preview-panel__meta strong {
  color: var(--color-text);
}

.preview-panel__reduction {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-top: 0.5rem;
}

.preview-panel__reduction.positive {
  color: var(--color-success);
  background-color: var(--color-success-bg);
}

.preview-panel__reduction.negative {
  color: var(--color-warning);
  background-color: var(--color-warning-bg);
}

.preview-panel__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  color: var(--color-text-muted);
  text-align: center;
  min-height: 200px;
}

.preview-panel__placeholder svg {
  width: 40px;
  height: 40px;
  margin-bottom: 0.5rem;
  opacity: 0.5;
}