@charset "UTF-8";
body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
/*    background-color: #7fbae9; */
    background-color: #f5f5f5;
    color: black;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-size: 1.5em;
}

nav {
    display: flex;
    gap: 15px;
}

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

/* ハンバーガーメニュー */
.menu-toggle {
    display: none;
    flex-direction: column;
cursor: pointer;
}

.menu-toggle div {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 4px 0;
}
.nav-links {
    display: flex;
    gap: 15px;
}

@media screen and (max-width: 768px) {
    .nav-links {
	display: none;
	flex-direction: column;
	background-color: #7fbae9;
	position: absolute;
	top: 60px;
	right: 0;
	width: 200px;
    }
    .nav-links a {
	padding: 10px;
	border-top: 1px solid rgba(255,255,255,0.2);
    }
    .menu-toggle {
	display: flex;
    }
}

.container {
    padding: 20px;
    /* width: 100%; */
    max-width: 640px;
    margin: 0 auto;
    background-color: #ffffff;
}

.step {
    margin-bottom: 20px;
}
.step img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}
/*
.step h2 {
    color: #7fbae9;
}
*/
.step p {
    font-size: 1.1em;
    color: #333; /* 黒に固定 */
}

footer {
    background-color: #7fbae9;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 30px;
}

/*https://naeco.jp/iframe-responsive*/
.iframe-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}

.iframe-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.retbtn {
  background-color: #ff4d4d;
  color: #fff;
  border-radius: 10px;
  padding: 10px 30px;
  text-decoration: none;
  font-size: 1em;
  box-shadow: 0px 5px 15px -5px rgba(0,0,0,0.8);
}
.retbtn:hover {
  color: #fff;
  opacity: 0.6;
}