.youtube {
  width: 100%;
  aspect-ratio: 16 / 9;
}
.youtube iframe {
  width: 100%;
  height: 100%;
}

.pc {
  display: block !important;
}
.sp {
  display: none !important;
}

/*notes*/
header {
  border-bottom: 1px solid #f0f0f0;
  padding: 1em 0;
  text-align: center;
}

/*notes*/
section {
  margin: auto;
  max-width: 475px;
  padding: 33px 0 0;
}
h2 {
  font-size: 2.3rem;
  margin: 1em 0 .5em;
}

/* トップバナーの宇宙・光・ゴールドの世界観に合わせた大見出し */
.section-heading {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .2em;
  min-height: 62px;
  margin: 2.5em 0 1.2em;
  padding: .42em 2.6em .38em;
  border: 1px solid rgba(213, 169, 73, .72);
  border-radius: 10px;
  background:
    radial-gradient(circle at 12% 22%, rgba(255,255,255,.98) 0 1px, transparent 2px),
    radial-gradient(circle at 83% 24%, rgba(255,255,255,.9) 0 1px, transparent 2px),
    radial-gradient(circle at 72% 78%, rgba(255,255,255,.92) 0 1.5px, transparent 2.5px),
    radial-gradient(circle at 22% 75%, rgba(255,244,190,.95) 0 1px, transparent 2px),
    linear-gradient(128deg, #efe3ff 0%, #f8d9e9 37%, #fff2cb 67%, #eadcff 100%);
  box-shadow:
    0 10px 28px rgba(87, 38, 112, .17),
    inset 0 0 28px rgba(255,255,255,.68),
    inset 0 0 0 4px rgba(255,255,255,.38);
  color: #34135e;
  line-height: 1.25;
  text-align: center;
}
.section-heading::before,
.section-heading::after {
  position: absolute;
  z-index: -1;
  top: 50%;
  width: 2.2em;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, #c99436, transparent);
}
.section-heading::before {
  left: .55em;
}
.section-heading::after {
  right: .55em;
}
.section-heading__en {
  color: #9b3377;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  font-style: italic;
  font-weight: 600;
  letter-spacing: .12em;
  line-height: 1;
  text-shadow: 0 1px 0 #fff;
}
.section-heading__ja {
  color: #29114f;
  font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: .035em;
  text-shadow: 0 1px 0 #fff, 0 0 15px rgba(255,255,255,.9);
}
.b1__wrap {
  align-items: center;
  display: flex;
  margin-bottom: 2em;
}
.b1__wrap p {
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-left: .5em;
}
.b1__wrap p span {
  font-size: 1.0rem;
  font-weight: 400;
}
.b1__wrap img:last-child {
  margin-left: auto;
  width: 65%;
}
.t1 span {
  color: #ef0000;
  font-weight: 700;
}
.book {
  display: block;
  margin: 1em auto;
}
.b2__wrap {
  position: relative;
  background: #fafafa;
  border: 1px solid #ededed;
  border-radius: 2px;
  font-weight: 700;
  margin-top: 1.5em;
  padding: 1em 3.5em;
}
.b2__wrap img {
  position: absolute;
  top: 1.4em;
  left: 1.5em;
}
.t2 {
  padding: 1.5em 0 0;
}
.t2 span {
  background: linear-gradient(transparent 70%, #fff600 0%);
  font-weight: 700;
}
ul {
  background: #fafafa;
  border: 1px solid #ededed;
  border-radius: 2px;
  margin: 1.5em 0;
  padding: 1em;
}
ul li {
  position: relative;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: .7em;
  padding: 0 0 0 3em;
}
ul li::before {
  position: absolute;
  content: "";
  background: 100% / 100% url(../img/check-mark.png) no-repeat;
  width: 15px;
  height: 15px;
  top: .2em;
  left: 1em;
}
ul li:last-child {
  margin-bottom: 0;
}
.button {
  display: block;
  margin: 3em auto 4em;
}
h3 {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 10% 25%, rgba(255,255,255,.55) 0 1px, transparent 2px),
    radial-gradient(circle at 90% 70%, rgba(255,228,153,.7) 0 1px, transparent 2px),
    linear-gradient(125deg, #4a176f 0%, #812b82 42%, #b73d79 72%, #7a2b78 100%);
  border: 1px solid #d8ad58;
  border-radius: 10px;
  box-shadow: 0 7px 18px rgba(75, 24, 97, .22), inset 0 0 0 3px rgba(255,255,255,.1);
  font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;
  font-size: 2.0rem;
  letter-spacing: .03em;
  line-height: 1.35;
  margin: 1.4em 0 .65em;
  padding: .75em 2.2em;
  text-align: center;
  text-shadow: 0 1px 3px rgba(34, 8, 50, .45);
}
h3::before,
h3::after {
  position: absolute;
  top: 50%;
  color: #f5d78d;
  content: "✦";
  font-family: Georgia, serif;
  font-size: 1.2rem;
  transform: translateY(-50%);
}
h3::before {
  left: 1.1em;
}
h3::after {
  right: 1.1em;
}
.program-heading {
  box-sizing: border-box;
  font-size: clamp(1.12rem, 3.3vw, 1.55rem);
  padding: .68em 1.2em;
  white-space: nowrap;
}
.program-heading::before,
.program-heading::after {
  display: none;
}
.syukunami {
  display: block;
  margin: 1.5em auto;
}
/*notes*/
footer {
  font-size: 1.0rem;
  text-align: center;
}
footer a {
  background: #f7f3e7;
  display: block;
  padding: 1em 0;
}
footer p {
  background: #000;
  color: #fff;
  font-weight: 700;
  padding: 1em 0;
}

@media screen and (max-width:720px){
.pc {
  display: none !important;
}
.sp {
  display: block !important;
}
.contents {
  padding: 0 5%;
}
.section-heading {
  min-height: 56px;
  margin: 2.2em 0 1em;
  padding: .45em 1.8em .4em;
}
.section-heading__ja {
  font-size: 1.55rem;
  letter-spacing: .01em;
}
.section-heading::before,
.section-heading::after {
  width: 1.4em;
}
h3 {
  font-size: 1.65rem;
  padding: .72em 2em;
}
.program-heading {
  font-size: clamp(1.12rem, 3.8vw, 1.4rem);
  padding: .66em 1.15em;
}
h3::before {
  left: .75em;
}
h3::after {
  right: .75em;
}
}