.dev-banner {
  background: #f59e0b;
  color: #000;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 5px 16px;
  letter-spacing: 0.5px;
}

.nav {
  background: #0d0d12;
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--primary);
  margin-right: 8px;
  letter-spacing: -0.5px;
  text-transform: uppercase;
}
.nav-logo-link {
  display: flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  margin-right: auto;
}
.nav-logo { font-size: 1.2rem; margin-right: 4px; }
.nav-challenge-badge {
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.nav a {
  color: var(--text-muted);
  font-size: 0.88rem;
  padding: 6px 12px;
  border-radius: 50px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.nav a:hover, .nav a.active {
  color: var(--text);
  background: var(--surface2);
}
.nav-auth { font-size: 0.8rem; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 110px; }
#nav-signout {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 5px 12px;
  font-size: 0.82rem;
  border-radius: 50px;
  white-space: nowrap;
}

.nav-hamburger {
  display: none;
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 7px 14px;
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1;
  border-radius: 50px;
}

.nav-drawer {
  display: none;
  flex-direction: column;
  background: #0d0d12;
  border-bottom: 1px solid var(--border);
  padding: 8px 16px 16px;
  gap: 4px;
}
.nav-drawer a {
  color: var(--text-muted);
  font-size: 1rem;
  padding: 11px 14px;
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s;
  display: block;
}
.nav-drawer a:hover, .nav-drawer a.active {
  color: var(--text);
  background: var(--surface2);
}
.nav-drawer .drawer-auth {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 10px 14px 4px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}
.nav-drawer #drawer-signout {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 14px;
  font-size: 0.9rem;
  width: 100%;
  text-align: left;
  border-radius: var(--radius);
  margin-top: 6px;
}

@media (max-width: 640px) {
  .nav a:not(.nav-logo-link), .nav-auth, #nav-signout { display: none; }
  .nav-hamburger { display: block; }
  .nav-drawer.open { display: flex; }
}