body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f8fafc;
  color: #1e293b;
}
.hero {
  background: linear-gradient(135deg, #bae6fd, #64748b);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
}
.hero-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #f1f5f9;
}
.cta {
  background: white;
  color: #0369a1;
  padding: 0.7rem 1.4rem;
  text-decoration: none;
  font-weight: bold;
  border-radius: 5px;
  margin-top: 1rem;
  display: inline-block;
  border: 1px solid #94a3b8;
}
.cta:hover {
  background: #e0f2fe;
}
nav {
  background: #e2e8f0;
  padding: 1rem;
  text-align: center;
}
nav a {
  margin: 0 1rem;
  color: #334155;
  text-decoration: none;
  font-weight: bold;
}
nav a.active {
  text-decoration: underline;
}
main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
}
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}
footer {
  text-align: center;
  padding: 2rem 1rem;
  background: #e2e8f0;
  font-size: 0.9rem;
  color: #475569;
}
a[href^="mailto:"] {
  color: #1e40af;
  text-decoration: underline;
}