body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #006666;
    color: white;
    text-align: center;
    padding: 0.5em 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer {
    background-color: #006666;
	color: white;
    padding: 0.5em 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h2 {
    margin: 0;
    flex-grow: 1;
    text-align: left;
    padding-left: 1em;
}

main h2 {
    margin: 0;
    flex-grow: 1;
    text-align: left;
    padding-left: 0.3em;
}

main h3 {
    margin: 0;
    flex-grow: 1;
    text-align: left;
    padding-left: 0.5em;
}

nav {
    display: none;
    flex-direction: column;
    align-items: flex-end;
    position: absolute;
    top: 75px; /* Adjust based on header height */
    right: 0;
    background-color: #008866; /* メニュー背景色 */
    width: 250px; /* メニューの幅 */
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5em 1em;
    width: 100%;
    text-align: right;
}

.hamburger {
    cursor: pointer;
    display: inline-block;
    padding: 1em;
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px 0;
    transition: transform 0.2s, opacity 0.2s;
}

.hamburger.open div:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.open div:nth-child(2) {
    opacity: 0;
}

.hamburger.open div:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

summary {
  display: block;
  cursor: pointer;
  transition: 0.2s; 
}
/* Chrome、Safari */
summary::-webkit-details-marker {
  display: none;
}