/* TOP introduction only. No global, hero, HISTORY or sponsor-column overrides. */
.ts50-home .ts50-opening {
  background: #f7f6f2;
  color: #172039;
  padding: 74px 40px 64px;
  scroll-margin-top: 88px;
}
.ts50-opening *, .ts50-opening *::before, .ts50-opening *::after { box-sizing: border-box; }
.ts50-opening .ts50-opening__inner { max-width: 1240px; margin: 0 auto; }
.ts50-opening .ts50-opening__masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid #c8ccd1;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}
.ts50-opening .ts50-opening__masthead p { margin: 0; font-size: 12px; line-height: 1.8; letter-spacing: .06em; font-weight: 500; }
.ts50-opening .ts50-opening__masthead p > span { margin-left: 14px; }
.ts50-opening .ts50-opening__masthead .ts50-opening__theme { font-family: Arial, sans-serif; font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.ts50-opening .ts50-opening__theme span { font-family: -apple-system, BlinkMacSystemFont, "Yu Gothic", Meiryo, sans-serif; font-size: 11px; font-weight: 400; letter-spacing: .04em; }
.ts50-opening .ts50-opening__feature { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(0, 1fr); align-items: center; gap: clamp(32px, 4.8vw, 68px); }
/* Album print: subtle mounts; the image itself is neither cropped nor filtered. */
.ts50-opening .ts50-opening__photo {
  --ts50-album-angle: -.55deg;
  --ts50-album-entry-angle: -1.6deg;
  --ts50-album-lift: -18px;
  position: relative;
  isolation: isolate;
  min-width: 0;
  margin: 8px 4px 6px;
  padding: 13px 13px 18px;
  background: #fffefa;
  border: 1px solid #e5e1d8;
  box-shadow: 0 2px 4px rgba(35, 30, 24, .045), 0 13px 23px -17px rgba(35, 30, 24, .24);
  transform: rotate(var(--ts50-album-angle));
  transform-origin: 50% 55%;
}
.ts50-opening .ts50-opening__photo::before,
.ts50-opening .ts50-opening__photo::after {
  content: "";
  position: absolute;
  z-index: 2;
  width: 16px;
  height: 16px;
  background: rgba(196, 198, 191, .28);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}
.ts50-opening .ts50-opening__photo::before { top: 2px; left: 2px; }
.ts50-opening .ts50-opening__photo::after { right: 2px; bottom: 2px; transform: rotate(180deg); }
/* Progressive enhancement: always visible without JS; one entrance, never hover or a loop. */
.ts50-opening .ts50-opening__photo.is-album-revealed {
  animation: ts50AlbumSettle 1100ms cubic-bezier(.2, .65, .25, 1) both;
}
@keyframes ts50AlbumSettle {
  0% {
    opacity: .55;
    transform: translate3d(0, var(--ts50-album-lift), 0) rotate(var(--ts50-album-entry-angle)) scale(1.016);
  }
  55% { opacity: 1; }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) rotate(var(--ts50-album-angle)) scale(1);
  }
}
.ts50-opening .ts50-opening__photo-image { display: block; width: 100%; max-width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; border: 0; border-radius: 0; }
.ts50-opening .ts50-opening__photo figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 18px;
  margin: 13px 0 0;
  padding: 0 3px;
  font-family: -apple-system, BlinkMacSystemFont, "Yu Gothic", Meiryo, sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .04em;
  line-height: 1.7;
  color: #64615c;
}
.ts50-opening .ts50-opening__story { min-width: 0; padding: 0 0 24px; }
.ts50-opening .ts50-opening__title {
  margin: 0 0 28px;
  padding: 0;
  border: 0;
  background: none;
  font-family: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(29px, 3.05vw, 42px);
  font-weight: 600;
  line-height: 1.65;
  letter-spacing: -.015em;
  color: #001040;
  text-align: left;
}
.ts50-opening .ts50-opening__title > span { display: block; }
.ts50-opening .ts50-opening__text {
  max-width: 31em;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 2.05;
  letter-spacing: .025em;
  color: #404853;
}
.ts50-opening .ts50-opening__text p { margin: 0 0 14px; line-height: inherit; }
.ts50-opening .ts50-opening__text p:last-child { margin-bottom: 0; }
.ts50-opening .ts50-opening__about {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  min-height: 48px;
  margin-top: 23px;
  padding: 8px 0;
  border-bottom: 1px solid #73839a;
  background: none;
  color: #001040;
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
  text-decoration: none;
}
.ts50-opening .ts50-opening__arrow { flex-shrink: 0; display: inline-block; font-family: Arial, sans-serif; font-size: 25px; line-height: 1; font-weight: 400; transition: transform .2s ease; }
.ts50-opening .ts50-opening__index { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 0 64px; margin-top: 48px; }
.ts50-opening .ts50-opening__route {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 110px;
  padding: 23px 0 20px;
  border-top: 1px solid #b6bec9;
  color: #001040;
  background: none;
  text-decoration: none;
}
.ts50-opening .ts50-opening__route-copy { display: block; min-width: 0; }
.ts50-opening .ts50-opening__route-copy strong { display: block; margin-bottom: 8px; font-size: 25px; line-height: 1.4; font-weight: 600; letter-spacing: .04em; }
.ts50-opening .ts50-opening__route-copy > span { display: block; font-family: -apple-system, BlinkMacSystemFont, "Yu Gothic", Meiryo, sans-serif; color: #525c6c; font-size: 12px; line-height: 1.8; }
.ts50-opening a:focus-visible { outline: 2px solid #007eaf; outline-offset: 6px; }
@media (hover: hover) and (pointer: fine) {
  .ts50-opening .ts50-opening__about:hover,
  .ts50-opening .ts50-opening__route:hover { color: #007eaf; }
  .ts50-opening .ts50-opening__about:hover .ts50-opening__arrow,
  .ts50-opening .ts50-opening__route:hover .ts50-opening__arrow { transform: translateX(5px); }
}
@media (max-width: 1100px) and (min-width: 861px) {
  .ts50-home .ts50-opening { padding-left: 30px; padding-right: 70px; }
  .ts50-opening .ts50-opening__feature { gap: 30px; }
  .ts50-opening .ts50-opening__title { font-size: 29px; }
  .ts50-opening .ts50-opening__text { font-size: 14px; }
}
@media (max-width: 860px) {
  .ts50-home .ts50-opening { padding: 48px 24px 40px; scroll-margin-top: 70px; }
  .ts50-opening .ts50-opening__masthead { margin-bottom: 28px; gap: 12px; flex-wrap: wrap; }
  .ts50-opening .ts50-opening__feature { grid-template-columns: 1fr; gap: 30px; }
  .ts50-opening .ts50-opening__photo { --ts50-album-angle: -.25deg; --ts50-album-entry-angle: -.85deg; --ts50-album-lift: -10px; margin: 5px 3px; padding: 10px 10px 15px; }
  .ts50-opening .ts50-opening__photo::before,
  .ts50-opening .ts50-opening__photo::after { width: 12px; height: 12px; }
  .ts50-opening .ts50-opening__photo figcaption { gap: 3px 10px; margin-top: 11px; font-size: 10px; }
  .ts50-opening .ts50-opening__story { padding-bottom: 0; }
  .ts50-opening .ts50-opening__title { font-size: clamp(28px, 4.8vw, 38px); line-height: 1.6; margin-bottom: 22px; }
  .ts50-opening .ts50-opening__text { max-width: 40em; font-size: 15px; }
  .ts50-opening .ts50-opening__about { margin-top: 16px; }
  .ts50-opening .ts50-opening__index { grid-template-columns: 1fr; gap: 0; margin-top: 30px; }
  .ts50-opening .ts50-opening__route { min-height: 105px; padding: 22px 0; }
  .ts50-opening .ts50-opening__route-copy strong { font-size: 23px; }
}
@media (max-width: 480px) {
  .ts50-home .ts50-opening { padding-right: 20px; padding-left: 20px; }
  .ts50-opening .ts50-opening__masthead { display: block; }
  .ts50-opening .ts50-opening__masthead .ts50-opening__theme { margin-top: 8px; font-size: 12px; }
  .ts50-opening .ts50-opening__title { font-size: clamp(25px, 6.8vw, 30px); }
  .ts50-opening .ts50-opening__text { font-size: 15px; line-height: 1.95; }
  .ts50-opening .ts50-opening__route { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .ts50-opening .ts50-opening__arrow { transition: none; }
  .ts50-opening .ts50-opening__photo.is-album-revealed {
    animation: none;
    opacity: 1;
    transform: rotate(var(--ts50-album-angle));
  }
}