/* ─── §4  Top nav (sticky glass) ───────────────────────────────────────── */

.lp-nav {
  position: sticky; top: 0; z-index: 30;
  padding: 14px 0;
  backdrop-filter: blur(16px) saturate(1.1);
  -webkit-backdrop-filter: blur(16px) saturate(1.1);
  background: color-mix(in oklab, var(--bg-page) 70%, transparent);
  border-bottom: 1px solid var(--hairline);
}
.lp-nav-inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
}
.lp-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.lp-logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  display: grid; place-items: center;
  color: white;
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.25),
    0 6px 18px -6px var(--halo);
}
.lp-logo-mark img { width: 24px; height: 24px; border-radius: 6px; }
.lp-nav-actions { display: flex; align-items: center; gap: 10px; }
.lp-theme-btn,
.lp-nav-link {
  height: 40px;
  border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 16px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid var(--hairline);
  background: var(--surface-1);
  transition: all 0.2s var(--ease);
  letter-spacing: -0.01em;
}
.lp-theme-btn { width: 40px; padding: 0; font-size: 1.05rem; }
.lp-theme-btn:hover,
.lp-nav-link:hover {
  transform: translateY(-1px);
  border-color: var(--hairline-2);
  background: var(--surface-2);
  box-shadow: 0 6px 16px -8px var(--halo);
}
@media (max-width: 540px) {
  .lp-nav-link { display: none; }
  .lp-nav-inner { padding: 0 18px; }
}