body {
  font-family: "Hiragino Kaku Gothic ProN", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #004d99;
  color: white;
  padding: 20px;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2em;
}

nav ul {
  list-style: none;
  padding: 0;
  margin-top: 10px;
  display: flex;
  justify-content: center;
  gap: 20px;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 40px 20px;
  max-width: 900px;
  margin: auto;
}

section {
  margin-bottom: 50px;
}

h2 {
  border-bottom: 2px solid #004d99;
  padding-bottom: 5px;
  margin-bottom: 20px;
}

ul {
  padding-left: 20px;
}

.work-item {
  background-color: #fff;
  border: 1px solid #ddd;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 5px;
}

footer {
  background-color: #004d99;
  color: white;
  text-align: center;
  padding: 10px;
}

.btn {
  display: inline-block;
  background-color: #00bcd4;
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
  transition: background-color 0.3s;
}

.btn:hover {
  background-color: #0097a7;
}