body {
  margin: 0;
  font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: #f7f8fa;
  color: #222;
}
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #003366;
  color: #fff;
  padding: 20px 40px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  animation: fadeInDown 1s;
}
.logo {
  font-size: 2rem;
  font-weight: bold;
  letter-spacing: 2px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 30px;
  margin: 0;
  padding: 0;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.3s;
}
nav a:hover {
  color: #ffcc00;
}
.hero {
  background: linear-gradient(120deg, #005fa3 60%, #eaf6ff 100%);
  color: #fff;
  text-align: center;
  padding: 100px 20px 60px 20px;
  animation: fadeIn 1.2s;
}
.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  letter-spacing: 2px;
}
.hero p {
  font-size: 1.5rem;
}
.feature {
  background: #fff;
  margin: 40px auto;
  max-width: 900px;
  border-radius: 18px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.07);
  padding: 50px 30px;
  text-align: center;
  animation: fadeInUp 1s;
}
.feature h2 {
  color: #005fa3;
  font-size: 2rem;
  margin-bottom: 16px;
}
footer {
  background: #003366;
  color: #fff;
  text-align: center;
  padding: 18px 0;
  margin-top: 60px;
  font-size: 1rem;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(60px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-40px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 700px) {
  .main-header { flex-direction: column; padding: 16px 10px; }
  .logo { font-size: 1.3rem; }
  nav ul { gap: 12px; }
  .hero h1 { font-size: 2rem; }
  .feature { padding: 30px 10px; }
}