.ebook-library {
  padding-top: 3.5rem;
}

.ebook-tabs {
  display: flex;
  gap: 0.7rem;
  margin: 1.6rem 0 1.4rem;
  padding: 0.4rem;
  width: fit-content;
  max-width: 100%;
  border: 1px solid rgba(193, 156, 92, 0.3);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.24);
}

.ebook-tab {
  min-width: 8.5rem;
  padding: 0.75rem 1.2rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--commerce-muted);
  background: transparent;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.ebook-tab:hover {
  color: #fff;
}

.ebook-tab[aria-selected="true"] {
  color: #090b09;
  border-color: var(--commerce-gold);
  background: linear-gradient(135deg, #d5b274, #a88042);
}

.ebook-tab:focus-visible,
.download-button:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 3px;
}

.ebook-panel[hidden] {
  display: none;
}

.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
  gap: 2rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  border: 1px solid rgba(193, 156, 92, 0.32);
  border-radius: 1.4rem;
  background:
    radial-gradient(circle at top right, rgba(193, 156, 92, 0.16), transparent 42%),
    linear-gradient(145deg, rgba(22, 27, 22, 0.98), rgba(8, 10, 8, 0.98));
  box-shadow: 0 1.4rem 3.5rem rgba(0, 0, 0, 0.25);
}

.download-card h3 {
  margin: 0.7rem 0 1rem;
  font-size: clamp(1.65rem, 4vw, 2.5rem);
  line-height: 1.08;
}

.download-card-copy > p:not(.download-version):not(.download-note) {
  max-width: 58ch;
  color: var(--commerce-muted);
  line-height: 1.75;
}

.download-version {
  margin: 1.1rem 0 0;
  color: var(--commerce-gold);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 1.1rem;
  padding: 0.9rem 1.25rem;
  border: 1px solid #d5b274;
  border-radius: 0.75rem;
  color: #090b09;
  background: linear-gradient(135deg, #d5b274, #a88042);
  font-weight: 800;
  text-decoration: none;
}

.download-button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.download-note {
  margin: 0.7rem 0 0;
  color: var(--commerce-muted);
  font-size: 0.86rem;
}

.download-contents {
  padding: 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  background: rgba(0, 0, 0, 0.22);
}

.download-contents h4 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
}

.download-contents ol {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding-left: 1.25rem;
}

.download-contents li {
  padding-left: 0.25rem;
  color: var(--commerce-gold);
}

.download-contents strong,
.download-contents span {
  display: block;
}

.download-contents strong {
  color: #fff;
}

.download-contents span {
  margin-top: 0.25rem;
  color: var(--commerce-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.download-scope {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem 1rem;
  margin-top: 1rem;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--commerce-gold);
  background: rgba(193, 156, 92, 0.08);
}

.download-scope strong {
  color: var(--commerce-gold);
}

.download-scope p {
  margin: 0;
  color: var(--commerce-muted);
}

@media (max-width: 760px) {
  .ebook-tabs {
    width: 100%;
  }

  .ebook-tab {
    flex: 1;
    min-width: 0;
  }

  .download-card {
    grid-template-columns: 1fr;
  }

  .download-scope {
    grid-template-columns: 1fr;
  }
}