.mobile-nav[hidden] { display: none; }
.site-header .mobile-nav {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  width: auto;
  max-height: calc(100dvh - 80px);
  margin: 0;
  padding: 12px 24px 8px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: var(--paper);
  box-shadow: 0 12px 24px #181b1908;
  animation: mobile-nav-enter .2s ease-out;
}
.site-header .mobile-nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 0;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -.02em;
}
.site-header .mobile-nav a[aria-current="page"] { color: var(--accent); }
.mobile-nav-secondary {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 12px;
  padding-top: 4px;
  border-top: 1px solid var(--line);
}
.site-header .mobile-nav-secondary a {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0;
}
.mobile-nav-secondary a:last-child { margin-left: auto; }
.site-header .mobile-nav a:hover { color: var(--accent); }
.mobile-nav a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.menu-toggle[aria-expanded="true"] { background: var(--soft); border-radius: 3px; }
@keyframes mobile-nav-enter {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .site-header .mobile-nav { animation: none; }
}