:root {
  --color-main: #e0f7f5;
  --color-sub: #42d1d8;
  --color-font: #333;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Meiryo", sans-serif;
  background-color: var(--color-main);
  color: var(--color-font);
}

.header {
  background: #fff;
  padding: 15px;
  text-align: center;
}

.header h1 {
  margin: 0;
  color: var(--color-sub);
  letter-spacing: 2px;
  font-size: 22px;
}

.global-nav {
  background-color: var(--color-sub);
  display: flex;
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}

.global-nav a {
  flex: 1;
  min-width: 50px;
  color: #fff;
  text-align: center;
  padding: 8px 0;
  text-decoration: none;
  border-right: 1px solid rgba(255, 255, 255, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.3;
}

.global-nav a:last-child {
  border-right: none;
}

.nav-en {
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 1px;
}

.nav-ja {
  font-size: 9px;
  opacity: 0.9;
}

.l-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 15px;
}

.section-headline {
  text-align: center;
  margin-bottom: 20px;
  color: var(--color-sub);
  font-size: 20px;
  letter-spacing: 1px;
  font-weight: bold;
}

.note-box {
  background: #fff;
  border-radius: 8px;
  padding: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: #555;
}