:root {
  --paper: #FFFFFF;
  --navy: #1E2B3C;
  --amber: #EBAB2F;
  --gray: #8A919C;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--navy);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  overflow-x: hidden;
}
main { max-width: 560px; margin: 0 auto; }
@media (min-width: 900px) {
  body { background: #EEF2F7; }
  main { box-shadow: 0 0 40px rgba(30, 43, 60, .08); background: var(--paper); }
}
.part { position: relative; line-height: 0; }
.part img { display: block; width: 100%; height: auto; }
.hit {
  position: absolute;
  display: block;
  font-size: 0;
  color: transparent;
  border-radius: 2px;
}
.hit:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
.foot {
  padding: 32px 24px 112px;
  text-align: center;
  font-size: 14px;
  color: var(--gray);
}
.foot a { color: var(--navy); }
.float {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translate(-50%, 140%);
  width: min(528px, calc(100% - 32px));
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  font-size: 17px;
  letter-spacing: .08em;
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(30, 43, 60, .25);
  transition: transform .35s ease;
  z-index: 10;
}
.float.show { transform: translate(-50%, 0); }
.float:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
.part img.reveal { opacity: 0; transition: opacity .8s ease; }
.part img.reveal.in { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  .float { transition: none; }
  .part img.reveal { opacity: 1; transition: none; }
}