body {
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  background: #f4f7fb;
  color: #232a33;
}
header nav {
  background: #273b56;
  text-align: center;
  box-shadow: 0 2px 8px rgba(39,59,86,0.03);
}
header nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: inline-flex;
}
header nav ul li {
  margin: 0 1.5em;
}
header nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  padding: 1.3em 0;
  display: block;
  transition: color 0.2s;
}
header nav ul li a:hover {
  color: #58a4ff;
  border-bottom: 2px solid #58a4ff;
}

main {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 85vh;
  padding-top: 48px;
}

.profile-card {
  background: #fff;
  max-width: 480px;
  width: 100%;
  margin: 3em auto 0 auto;
  border-radius: 12px;
  box-shadow: 0 4px 28px rgba(40,60,90,0.11), 0 1.5px 3.5px rgba(39,59,86,0.04);
  padding: 2.3em 2em 2.1em 2em;
}

.profile-card h1 {
  margin-top: 0;
  font-size: 2em;
  letter-spacing: 0.5px;
}

.profile-card h2 {
  font-size: 1.2em;
  margin-top: 2em;
  margin-bottom: 0.9em;
  color: #273b56;
}

.profile-card p, .profile-card ul {
  font-size: 1.05em;
}

.profile-card ul {
  padding-left: 1.1em;
}

footer {
  background: #273b56;
  color: #fff;
  text-align: center;
  font-size: 0.97em;
  padding: 0.7em;
  margin-top: 2em;
  border-radius: 0 0 8px 8px;
}