body {
  margin: 0;
      font-family: "Rounded Mplus 1c", "Hiragino Maru Gothic ProN", "メイリオ", sans-serif;
  background-color: #f5f3ef;
  color: #333;
  line-height: 1.8;
}

/* header */
header {
  background: #ff9f68;
  color: #fff;
  text-align: center;
  padding: 70px 20px;
}
/*
header {
  background-color: #3e2f25;
  color: #fff;
  text-align: center;
  padding: 40px 20px;
}
*/
header h1 {
  margin: 0;
  font-size: 28px;
}

.subtitle {
  font-size: 14px;
  opacity: 0.8;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

.video-section {
  margin-bottom: 40px;
}

video {
  width: 100%;
  border-radius: 8px;
  background: #000;
}

.lesson {
  background-color: #fff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
}

.lesson h2 {
  margin-top: 0;
  border-left: 5px solid #3e2f25;
  padding-left: 10px;
}

ul, ol {
  padding-left: 20px;
}


/* footer */
footer {
  background: #ff9f68;
  color: #fff;
  text-align: center;
  padding: 25px;
  font-size: 0.9em;
}
/*
.images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.images img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.images-single {
  max-width: 100%;
  margin: 16px auto;
  text-align: center;
  border-radius: 16px;
  overflow: hidden;
}

.images,
figure {
  max-width: 100%;
  overflow: hidden;
}

.images img,
figure img {
  max-width: 100%;
  height: auto;
  display: block;
}
*/

.images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.images-grid img {
  width: 100%;
  height: auto;
  display: block;
}

.images-single {
  max-width: 100%;
  margin: 16px auto;
  border-radius: 16px;
  text-align: center;
  background: #fff;
}

.images-single img {
  width: 100%;
  height: auto;
  display: block;
}

.images-single figcaption {
  padding: 12px 16px;
  font-size: 0.9rem;
  line-height: 1.6;
}


.breadcrumb {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

.breadcrumb li {
  margin-right: 8px;
}

.breadcrumb li::after {
  content: ">";
  margin-left: 8px;
}

.breadcrumb li:last-child::after {
  content: "";
}

.breadcrumb a {
  text-decoration: none;
  color: #0073aa;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* summaryの横にある三角矢印のデザインなどを調整 */
summary h2 {
    margin: 0;
    padding: 10px 0;
}

details {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 10px;
    background-color: #f9f9f9;
}

details[open] {
    background-color: #fff;
}

summary {
    outline: none;
}

.section {
	background-color: #fff;
	margin-bottom: 20px;
	border-radius: 8px;
    padding: 80px 25px;
/*    max-width: 600px;	*/
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 4px;
    background: var(--accent);
    margin: 10px auto;
}

.download-box {
  border: 2px solid #8b5e3c;
  padding: 20px;
  margin: 25px 0;
  background-color: #fffaf5;
  text-align: center;
  border-radius: 8px;
}

.download-btn {
  display: inline-block;
  background-color: #8b5e3c;
  color: #ffffff;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: bold;
  text-decoration: none;
  border-radius: 5px;
  margin-top: 10px;
}

.download-btn:hover {
  background-color: #6f472e;
}

.print-note {
  font-size: 14px;
  color: #555;
  margin-top: 10px;
}

html {
    scroll-behavior: smooth;
}