.os-nav {
  background-color: #FFFFFF;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='24'%3E%3Cpath d='M0 24 a24 20 0 0 1 48 0' fill='none' stroke='%23F26B43' stroke-width='1.2' opacity='0.35'/%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-position: bottom;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.os-nav-inner {
  max-width: 700px;
  margin: 0 auto;
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  padding: .625rem 1.25rem;
}

.os-nav-brand {
  font-family: var(--font-ui);
  font-size: .8125rem;
  font-weight: 400;
  color: var(--text);
  text-decoration: none;
  padding: .3125rem .6875rem;
  border-radius: var(--radius-round);
  background: var(--accent-dim);
  margin-right: .375rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.os-nav-links {
  display: flex;
  gap: .375rem;
  flex-wrap: wrap;
}

.os-nav-link {
  font-family: var(--font-ui);
  font-size: .8125rem;
  font-weight: 300;
  color: var(--text-2);
  text-decoration: none;
  white-space: nowrap;
  padding: .3125rem .6875rem;
  border-radius: var(--radius-round);
  background: var(--accent-dim);
  transition: color var(--transition), font-weight var(--transition);
}

.os-nav-link.active { color: var(--text); font-weight: 400; }

@media (max-width: 520px) {
  .os-nav-inner { padding: .5rem .875rem; }
}

.os-nav-signout {
  margin-left: auto;
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 300;
  color: var(--text-3);
  background: none;
  border: none;
  padding: .3125rem .25rem;
  cursor: pointer;
  transition: color var(--transition);
}
.os-nav-signout:hover { color: var(--accent); }

/* Phone: one scrollable row of links instead of wrapping to 3 lines.
   The brand pill goes — the Home link already does its job. */
@media (max-width: 520px) {
  .os-nav-inner { flex-wrap: nowrap; }
  .os-nav-brand { display: none; }
  .os-nav-links {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    min-width: 0;
  }
  .os-nav-links::-webkit-scrollbar { display: none; }
  .os-nav-signout { flex-shrink: 0; }
}