.preview-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary-light);
  background: var(--color-primary-dim);
  border: 1px solid rgba(37, 99, 235, 0.2);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.preview-btn:hover {
  background: rgba(37, 99, 235, 0.22);
  border-color: rgba(37, 99, 235, 0.45);
  color: #fff;
}

.preview-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 300;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.preview-modal.open {
  display: flex;
}

.preview-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.preview-container {
  position: relative;
  z-index: 301;
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.preview-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.preview-label {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: opacity 0.18s ease;
}

.preview-label.fading {
  opacity: 0;
}

.preview-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.preview-counter {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.preview-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.preview-close:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--color-border-hover);
}

.preview-stage {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.preview-arrow {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.preview-arrow:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.preview-arrow:disabled {
  opacity: 0.2;
  cursor: default;
}

.preview-frame {
  flex: 1;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}

.preview-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 62vh;
  object-fit: contain;
  transition: opacity 0.18s ease;
}

.preview-img.fading {
  opacity: 0;
}

.preview-tabbar {
  display: flex;
  gap: 3px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 4px;
}

.preview-tab {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  letter-spacing: 0.03em;
}

.preview-tab:hover {
  color: var(--color-text);
}

.preview-tab.active {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 0 14px 0 var(--color-primary-glow);
}

@media (max-width: 600px) {
  .preview-tabbar {
    overflow-x: auto;
    max-width: 100%;
    border-radius: var(--radius-xl);
  }

  .preview-tab {
    padding: var(--space-2) var(--space-3);
  }

  .preview-arrow {
    width: 34px;
    height: 34px;
    font-size: 1.1rem;
  }
}