/* 俯瞰図はテキストと軽いCSSだけで作り、元の10章を複製しない。 */
.concept-a .experience-overview-open {
  position: absolute;
  right: 0;
  bottom: calc(100% + 10px);
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  min-width: 44px;
  min-height: 72px;
  padding: 7px 3px;
  border: 1px solid rgba(175, 231, 188, .7);
  background: rgba(11, 42, 25, .94);
  color: #f0fbf1;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  white-space: normal;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 9px 26px rgba(0, 0, 0, .2);
}
.concept-a .experience-overview-open:hover { background: #226440; }
.concept-a .experience-overview-label { font-size: 11px; line-height: 1.25; }
.concept-a .experience-overview-icon { display: grid; grid-template-columns: repeat(2, 5px); gap: 3px; }
.concept-a .experience-overview-icon i { display: block; width: 5px; height: 5px; border: 1px solid #cdf4d3; }

.concept-a .experience-stage,
.concept-a .experience-topbar,
.concept-a .experience-side,
.concept-a .experience-progress,
.concept-a .experience-guide { transition: transform .52s cubic-bezier(.2,.8,.2,1), opacity .36s ease, filter .52s ease; }
.concept-a .experience.is-overview-open .experience-stage {
  transform: perspective(1400px) translateZ(-210px) scale(.67);
  filter: blur(5px);
  opacity: .2;
  pointer-events: none;
}
.concept-a .experience.is-overview-open .experience-topbar,
.concept-a .experience.is-overview-open .experience-side,
.concept-a .experience.is-overview-open .experience-progress,
.concept-a .experience.is-overview-open .experience-guide { opacity: 0; pointer-events: none; }
.concept-a .experience.is-overview-open .experience-particles { opacity: 0; }

.concept-a .experience-overview[hidden] { display: none; }
.concept-a .experience-overview {
  position: absolute;
  z-index: 10;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3vh, 30px);
  padding: max(25px, env(safe-area-inset-top)) clamp(20px, 4vw, 64px) max(24px, env(safe-area-inset-bottom));
  overflow: auto;
  overscroll-behavior: contain;
  color: #f3fbf4;
  background: radial-gradient(circle at 12% 12%, rgba(47, 114, 66, .28), transparent 34%), rgba(3, 19, 11, .94);
  opacity: 0;
  transform: perspective(1300px) translateZ(-190px) scale(.88);
  transform-origin: var(--overview-origin-x, 50%) var(--overview-origin-y, 50%);
  pointer-events: none;
  transition: opacity .42s ease, transform .52s cubic-bezier(.2,.8,.2,1);
}
.concept-a .experience.is-overview-open .experience-overview { opacity: 1; transform: none; pointer-events: auto; }
.concept-a .experience-overview.is-zooming-in { opacity: 0; transform: perspective(1300px) translateZ(120px) scale(1.15); }
.concept-a .experience-overview-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; flex: 0 0 auto; }
.concept-a .experience-overview-head small { color: #9dccaa; font: 700 11px/1.5 ui-monospace, monospace; letter-spacing: .15em; }
.concept-a .experience-overview-head h2 { margin: 4px 0 3px; font-size: clamp(32px, 4vw, 54px); line-height: 1.12; letter-spacing: -.06em; }
.concept-a .experience-overview-head p { margin: 0; color: #c3ddc9; font-size: 15px; line-height: 1.6; }
.concept-a .experience-overview-close { flex: 0 0 auto; min-height: 44px; padding: 10px 16px; display: inline-flex; align-items: center; gap: 14px; border: 1px solid rgba(186, 229, 194, .52); background: rgba(24, 64, 38, .62); color: #f3fbf4; font-family: inherit; font-size: 14px; font-weight: 700; line-height: 1.3; cursor: pointer; }
.concept-a .experience-overview-close:hover { background: #286744; }
.concept-a .experience-overview-close span { font-size: 20px; font-weight: 400; }
.concept-a .experience-overview-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(270px, 330px); align-items: center; gap: clamp(18px, 2vw, 30px); min-height: 0; flex: 1 1 auto; }
.concept-a .experience-overview-grid { min-width: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); grid-template-rows: repeat(2, 210px); gap: clamp(9px, 1.1vw, 16px); }
.concept-a .experience-overview-card { position: relative; overflow: hidden; min-width: 0; min-height: 170px; display: flex; flex-direction: column; align-items: flex-start; text-align: left; gap: 8px; padding: clamp(15px, 1.5vw, 22px); border: 1px solid rgba(167, 216, 177, .26); background: linear-gradient(150deg, rgba(35, 85, 51, .76), rgba(8, 38, 22, .94)); color: #f2fbf3; cursor: pointer; transition: transform .3s ease, border-color .3s ease, background .3s ease, box-shadow .3s ease; }
.concept-a .experience-overview-card::after { content: ""; position: absolute; right: -25%; bottom: -38%; width: 90%; aspect-ratio: 1; border: 1px solid rgba(150, 222, 169, .17); border-radius: 50%; transform: rotate(-25deg); pointer-events: none; }
.concept-a .experience-overview-card:nth-child(3n)::after { border-radius: 0; transform: rotate(-28deg); }
.concept-a .experience-overview-card:hover { transform: translateY(-4px); border-color: #a7e3b3; }
.concept-a .experience-overview-card[aria-pressed="true"] { border-color: #baf0c3; background: linear-gradient(145deg, rgba(55, 127, 76, .92), rgba(14, 62, 33, .97)); box-shadow: inset 0 0 0 1px rgba(181, 239, 194, .4), 0 14px 30px rgba(0, 0, 0, .17); }
.concept-a .experience-overview-card.is-current-slide::before { content: "現在の章"; position: absolute; top: 12px; right: 12px; color: #c6edcf; font-size: 11px; }
.concept-a .experience-overview-card-number { color: #a9dfb6; font: 700 12px/1.4 ui-monospace, monospace; letter-spacing: .1em; }
.concept-a .experience-overview-card strong { position: relative; z-index: 1; font-size: clamp(17px, 1.45vw, 22px); line-height: 1.36; letter-spacing: -.04em; }
.concept-a .experience-overview-card-summary { position: relative; z-index: 1; margin-top: auto; color: #c4e3cc; font-size: 14px; line-height: 1.5; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
.concept-a .experience-overview-detail { min-width: 0; align-self: center; min-height: 436px; padding: clamp(19px, 2.5vw, 32px); border: 1px solid rgba(174, 226, 184, .55); background: linear-gradient(160deg, rgba(30, 78, 45, .86), rgba(7, 36, 21, .94)); }
.concept-a .experience-overview-count { color: #a7dfb4; font: 700 12px/1.5 ui-monospace, monospace; letter-spacing: .14em; }
.concept-a .experience-overview-detail h3 { margin: 18px 0 12px; font-size: clamp(24px, 2vw, 29px); line-height: 1.3; letter-spacing: -.05em; }
.concept-a .experience-overview-detail > p { color: #d1e8d5; font-size: 15px; line-height: 1.7; margin: 0 0 25px; }
.concept-a .experience-overview-slides { display: grid; gap: 8px; }
.concept-a .experience-overview-slides button { width: 100%; min-height: 50px; display: flex; align-items: center; gap: 11px; text-align: left; padding: 11px 12px; border: 1px solid rgba(166, 224, 178, .42); background: rgba(4, 36, 19, .66); color: #f3fbf3; font-family: inherit; font-size: 15px; font-weight: 600; line-height: 1.4; cursor: pointer; }
.concept-a .experience-overview-slides button::after { content: "↗"; margin-left: auto; color: #a4dcb0; }
.concept-a .experience-overview-slides button:hover { border-color: #b9edc3; background: #285e3d; }
.concept-a .experience-overview-slides button.is-current-slide { border-color: #aee8ba; }
.concept-a .experience-overview-slides button small { color: #a4dbb1; font: 700 12px/1.3 ui-monospace, monospace; }
.concept-a .experience-overview button:focus-visible,
.concept-a .experience-overview-open:focus-visible { outline: 3px solid #d7f7dd; outline-offset: 3px; }

@media (max-width: 1050px) {
  .concept-a .experience-overview-body { display: flex; flex-direction: column; }
  .concept-a .experience-overview-grid { flex: 1 1 auto; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-template-rows: none; }
  .concept-a .experience-overview-card { min-height: 120px; }
  .concept-a .experience-overview-detail { flex: 0 0 auto; align-self: stretch; min-height: 0; }
  .concept-a .experience-overview-slides { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 650px) {
  .concept-a .experience-overview-open { right: 0; }
  .concept-a .experience-overview { gap: 15px; padding: max(18px, env(safe-area-inset-top)) 16px max(18px, env(safe-area-inset-bottom)); overflow: hidden; }
  .concept-a .experience-overview-head { align-items: center; }
  .concept-a .experience-overview-head h2 { font-size: 32px; }
  .concept-a .experience-overview-head p { max-width: 20em; font-size: 13px; }
  .concept-a .experience-overview-close { width: 44px; min-width: 44px; padding: 8px; justify-content: center; font-size: 0; }
  .concept-a .experience-overview-close span { font-size: 24px; }
  .concept-a .experience-overview-body { gap: 13px; overflow: hidden; }
  .concept-a .experience-overview-grid { min-height: 0; flex: 1 1 auto; grid-template-columns: repeat(2, minmax(0, 1fr)); align-content: start; gap: 8px; overflow-y: auto; overscroll-behavior: contain; }
  .concept-a .experience-overview-card { min-height: 112px; padding: 13px; gap: 4px; }
  .concept-a .experience-overview-card strong { font-size: 16px; }
  .concept-a .experience-overview-card-summary { font-size: 13px; line-height: 1.35; }
  .concept-a .experience-overview-card.is-current-slide::before { content: "現在"; font-size: 10px; }
  .concept-a .experience-overview-detail { position: relative; z-index: 2; flex: 0 0 auto; max-height: 42vh; overflow-y: auto; padding: 15px; box-shadow: 0 -12px 28px rgba(0, 0, 0, .25); }
  .concept-a .experience-overview-detail h3 { margin: 6px 0; font-size: 23px; }
  .concept-a .experience-overview-detail > p { margin-bottom: 11px; font-size: 14px; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
  .concept-a .experience-overview-slides { grid-template-columns: 1fr; max-height: 154px; overflow-y: auto; }
  .concept-a .experience-overview-slides button { min-height: 44px; font-size: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .concept-a .experience-stage,
  .concept-a .experience-topbar,
  .concept-a .experience-side,
  .concept-a .experience-progress,
  .concept-a .experience-guide,
  .concept-a .experience-overview,
  .concept-a .experience-overview-card { transition: none; }
  .concept-a .experience.is-overview-open .experience-stage { filter: none; }
}

@media (max-height: 620px) {
  .concept-a .experience-overview-open {
    width: 112px;
    min-height: 44px;
    flex-direction: row;
    gap: 8px;
    padding: 5px 9px;
  }
}

@media (max-height: 620px) and (min-width: 651px) {
  .concept-a .experience-overview { gap: 9px; padding: 10px 18px; overflow: hidden; }
  .concept-a .experience-overview-head { align-items: center; }
  .concept-a .experience-overview-head h2 { font-size: 28px; }
  .concept-a .experience-overview-head p { font-size: 12px; }
  .concept-a .experience-overview-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(230px, 300px);
    align-items: stretch;
    gap: 10px;
    min-height: 0;
    overflow: hidden;
  }
  .concept-a .experience-overview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
    grid-auto-rows: minmax(84px, auto);
    align-content: start;
    min-height: 0;
    overflow-y: auto;
  }
  .concept-a .experience-overview-card { min-height: 84px; padding: 9px; gap: 2px; }
  .concept-a .experience-overview-card strong { font-size: 15px; }
  .concept-a .experience-overview-card-summary { font-size: 11px; -webkit-line-clamp: 1; }
  .concept-a .experience-overview-detail { min-height: 0; max-height: none; overflow-y: auto; padding: 13px; }
  .concept-a .experience-overview-detail h3 { margin: 5px 0; font-size: 19px; }
  .concept-a .experience-overview-detail > p { margin-bottom: 8px; font-size: 12px; line-height: 1.4; }
  .concept-a .experience-overview-slides { grid-template-columns: 1fr; }
  .concept-a .experience-overview-slides button { min-height: 38px; padding: 6px 8px; font-size: 12px; }
}