/* ============================================================
 * Topbar primitive — fixed frosted header with brand + book link.
 * ============================================================ */

.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10,20,42,0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--bg-lines);
}

.brand {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 1.2px;
  color: var(--white);
  white-space: nowrap;
  text-transform: uppercase;
}
.brand .accent { color: var(--accent-cyan-mid); }

.book-link {
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 1.2px;
  color: var(--white);
  text-decoration: none;
  transition: color 200ms ease;
}
.book-link .arrow {
  display: inline-block;
  margin-left: 6px;
  transition: transform 250ms cubic-bezier(0.65, 0, 0.35, 1);
}
.book-link:hover { color: var(--accent-cyan); }
.book-link:hover .arrow { transform: translateX(4px); }

@media (max-width: 900px) {
  .topbar { padding: 14px 16px; }
}