.mercantile-shell {
  max-width: 980px;
  margin: 48px auto;
  padding: 0 20px 64px;
}

.mercantile-card {
  padding: 40px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 760px) {
  .mercantile-card {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    padding: 28px 20px;
  }
}

/* --- 3D book cover -------------------------------------------------------
   The real rendered cover artwork, not a CSS mockup. */
.mercantile-visual {
  display: flex;
  justify-content: center;
  padding-top: 12px;
}

.mercantile-visual img {
  width: 220px;
  height: auto;
  filter: drop-shadow(0 24px 40px rgba(13, 37, 43, .28));
  transition: transform 0.35s ease;
}

.mercantile-visual:hover img {
  transform: translateY(-4px);
}

@media (prefers-reduced-motion: reduce) {
  .mercantile-visual img { transition: none; }
}

/* --- Copy column ---------------------------------------------------------- */
.mercantile-copy h1 {
  margin: 4px 0 12px;
  font-size: clamp(22px, 2.4vw, 28px);
}

.mercantile-lede {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15.5px;
}

.fact-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px 16px;
  margin: 0 0 20px;
  padding: 16px;
  background: var(--soft);
  border-radius: 10px;
}

.fact-list div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.fact-list dt {
  font-size: 0.8rem;
  color: var(--muted);
}

.fact-list dd {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

@media (max-width: 480px) {
  .fact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.mercantile-note {
  font-size: 13.5px;
  color: var(--muted);
  font-style: italic;
}

.mercantile-state .message {
  margin: 12px 0 0;
  color: var(--muted);
}

.mercantile-state .message.is-error {
  color: #a33328;
  font-weight: 700;
}

.mercantile-state .message.is-success {
  color: var(--green-dark);
  font-weight: 700;
}

.mercantile-download-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.mercantile-download-button:disabled {
  opacity: .6;
  cursor: default;
}