:root {
  color-scheme: light dark;
}

@media (prefers-color-scheme: light) {
  body { background:#f5f5f5; color:#05060a; }
  .nav { background:#ffffff; border-bottom:1px solid #ddd; }
  .card { background:#ffffff; border:1px solid #ddd; }
  a { color:#0050aa; }
}

@media (prefers-color-scheme: dark) {
  body { background:#05060a; color:#f5f5f5; }
  .nav { background:#0a0c12; border-bottom:1px solid #222; }
  .card { background:rgba(255,255,255,0.02); border:1px solid #333; }
  a { color:#7fd4ff; }
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem;
}

.nav {
  padding: 1rem 2rem;
  display: flex;
  gap: 2rem;
}

.card {
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-top: 1.25rem;
}

.tag {
  display: inline-block;
  padding: .15rem .5rem;
  border-radius: 999px;
  border: 1px solid #555;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.portal-header {
  text-align: center;
  margin-bottom: 40px;
}

.portal-intro h1 {
  margin: 0;
  font-size: 2.2rem;
}

.portal-intro h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 400;
  opacity: 0.8;
}

.portal-intro p {
  margin-top: 6px;
  font-size: 0.95rem;
  opacity: 0.7;
}

.portal-nav a {
  margin: 0 12px;
  font-weight: 600;
  text-decoration: none;
}