* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: #f0f8ff;
  color: #222;
  font-size: 16px;
  line-height: 1.6;
}
.wrapper {
  max-width: 960px;
  margin: 0 auto;
  background-color: #ffffff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.05);
}
header {
  background-color: #b3d9ff;
  padding: 10px 20px;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  font-size: 20px;
  font-weight: bold;
  color: #003366;
}
.logo img {
  height: 40px;
  margin-right: 10px;
}
.menu-icon {
  display: none;
  font-size: 28px;
  cursor: pointer;
}
nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
nav a {
  color: #003366;
  text-decoration: none;
  font-size: 16px;
}
.main-visual {
  text-align: center;
  padding: 30px 0;
  background-color: #e0f0ff;
}
.main-visual img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}
.content {
  padding: 20px;
}
@media (max-width: 768px) {
  .menu-links {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 10px;
  }
  .menu-links.active {
    display: flex;
  }
  .menu-icon {
    display: block;
  }
}