nav .nav-os {
  font: 500 .85rem var(--sans);
  color: var(--ink);
  background: none;
  border: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-family: var(--sans);
  letter-spacing: 0;
}
nav .nav-os:hover { color: var(--green); }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(23, 23, 22, .55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 20px;
}
.modal-overlay.is-open { display: flex; }

.modal-card {
  background: var(--paper);
  border: 1px solid var(--line);
  max-width: 420px;
  width: 100%;
  padding: 34px 34px 30px;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  background: none;
  border: 0;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
}
.modal-close:hover { color: var(--ink); }

.modal-title {
  font: 600 1.7rem/1.2 var(--serif);
  margin: 0 0 8px;
  letter-spacing: -.02em;
}
.modal-sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: .92rem;
}
.modal-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.modal-links a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  font: 500 1rem var(--sans);
  transition: border-color .15s, color .15s;
}
.modal-links a:hover { border-color: var(--green); color: var(--green); }
.modal-links a span { color: var(--muted); }
.modal-links a:hover span { color: var(--green); }

@media (max-width: 720px) {
  nav .nav-os { font-size: .75rem; }
}