body {
  font-family: sans-serif;
  background: #f0f0f0;
  padding: 2rem;
  color: #333;
  margin: 0;
}

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: #004080;
  color: white;
  border-bottom: 2px solid #002050;
  z-index: 1000;
  height: 48px;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: 400px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  justify-content: space-around;
  padding: 0 1rem;
}

.nav-container a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  padding: 0.5rem 0.75rem;
}

.nav-container a:hover {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

main {
  max-width: 400px;
  margin: 5rem auto 2rem;
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.group-list {
  list-style: none;
  padding: 0;
}

.group-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  border-bottom: 1px solid #ddd;
}

.group-actions a {
  margin-left: 0.5rem;
  text-decoration: none;
}

.btn-primary {
  background-color: #004080;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 6px;
}

.btn-secondary {
  background-color: #eee;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
}

.btn-link {
  color: #004080;
  font-size: 0.9rem;
}