.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: 880px;
  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-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.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-frame-wrap {
  width: 850px;
  height: 580px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 24px 60px rgba(0, 0, 0, 0.6);
}

.preview-frame-wrap iframe {
  width: 850px;
  height: 580px;
  border: none;
  display: block;
  pointer-events: all;
}

@media (max-width: 900px) {
  .preview-container {
    width: 100%;
    padding: 0 var(--space-2);
  }

  /* Dimensions set via JS — iframe transform-origin fixed here */
  .preview-frame-wrap {
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .preview-frame-wrap iframe {
    transform-origin: top left;
  }
}