/* index.css
 * Page-specific overrides for index page.
 */

/* migrated from common.css: index page */

/* index main visual */
.index-page .site-header {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 20;
  pointer-events: none;
}

.index-page .site-header .global-nav,
.index-page .site-header .global-nav * {
  pointer-events: auto;
}

.index-page .page-main {
  min-height: 0;
}

.index-page .mv {
  width: min(100%, 1280px);
  max-width: 1280px;
  margin: 0 auto;
  aspect-ratio: 1417 / 2000;
  position: relative;
  overflow: hidden;
}

.index-page .mv::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("../image/top/mv.jpg");
  background-repeat: no-repeat;
  background-position: center top;
  background-size: calc(100% + 8px) calc(100% + 8px);
  transform: scale(1);
  opacity: 0;
  animation: mvFadeZoom 10s ease-out forwards;
  transform-origin: center center;
}

@keyframes mvFadeZoom {
  0% {
    opacity: 0;
    transform: scale(1);
  }
  35% {
    opacity: 1;
    transform: scale(1.03);
  }
  100% {
    opacity: 1;
    transform: scale(1.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  .index-page .mv::before {
    animation: none;
    opacity: 1;
  }
}

.index-page .mv-button-group {
  position: absolute;
  left: 50%;
  bottom: clamp(32px, 5vw, 64px);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 2vw, 28px);
  width: min(92%, 920px);
  z-index: 24;
}

.index-page .mv-prologue-button,
.index-page .mv-demo-button {
  display: block;
  width: min(410px, calc((100% - clamp(14px, 2vw, 28px)) / 2));
  aspect-ratio: 410 / 267;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  filter:
    drop-shadow(0 0 5px rgba(255, 145, 230, 0.72))
    drop-shadow(0 0 14px rgba(255, 95, 210, 0.45));
  opacity: 0;
  animation: mvDemoButtonFadeIn 1.8s ease 1.1s forwards;
  transform-origin: center;
  transition: transform 0.32s ease, filter 0.32s ease;
}

.index-page .mv-prologue-button {
  background-image: url("../image/top/prologue_button.png");
}

.index-page .mv-demo-button {
  background-image: url("../image/top/demo_button.png");
}

.index-page .mv-prologue-button:hover,
.index-page .mv-prologue-button:focus-visible,
.index-page .mv-demo-button:hover,
.index-page .mv-demo-button:focus-visible {
  transform: scale(1.04);
  filter:
    drop-shadow(0 0 6px rgba(130, 255, 180, 0.9))
    drop-shadow(0 0 16px rgba(70, 255, 145, 0.58));
}

.index-page .mv-copy-group {
  position: absolute;
  left: 50%;
  top: 54%;
  transform: translate(-50%, -50%);
  width: min(72%, 760px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(14px, 1.8vw, 28px);
  z-index: 15;
  pointer-events: none;
}

.index-page .mv-logo {
  width: 100%;
  aspect-ratio: 1040 / 639;
  background-image: url("../image/common/logo.png");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: contain;
  opacity: 0;
  animation: mvLogoFadeUp 2.4s cubic-bezier(0.22, 1, 0.36, 1) 0.35s forwards;
}

@media (min-width: 1025px) {
  .index-page .mv-copy-group {
    width: min(78vw, 1004px);
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .index-page .mv-copy-group {
    width: min(75.6%, 798px);
  }

  .index-page .mv-button-group {
    width: min(90%, 720px);
    bottom: clamp(24px, 4vw, 44px);
  }

  .index-page .mv-prologue-button,
  .index-page .mv-demo-button {
    width: min(300px, calc((100% - clamp(14px, 2vw, 28px)) / 2));
  }
}

@media (max-width: 767px) {
  .index-page .mv-copy-group {
    top: 51.5%;
    width: min(100%, 630px);
    gap: 10px;
  }

  .index-page .mv-button-group {
    --mv-button-gap: clamp(8px, 1.8vw, 10px);
    width: clamp(300px, 72vw, 520px);
    bottom: clamp(10px, 2.2vw, 14px);
    gap: var(--mv-button-gap);
  }

  .index-page .mv-prologue-button,
  .index-page .mv-demo-button {
    width: calc((100% - var(--mv-button-gap)) / 2);
  }
}

@keyframes mvLogoFadeUp {
  0% {
    opacity: 0;
    transform: translateY(28px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes mvDemoButtonFadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes mvReserveTextFadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .index-page .mv-logo,
  .index-page .mv-prologue-button,
  .index-page .mv-demo-button,
  .index-page .mv-event-link,
  .index-page .mv-reserve-text {
    animation: none;
    opacity: 1;
  }
}

.prologue-transition {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    radial-gradient(circle at top, rgba(255, 164, 218, 0.18), transparent 42%),
    rgba(9, 4, 20, 0.84);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
  z-index: 200;
}

.prologue-transition.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.prologue-transition__window {
  width: min(720px, 100%);
  min-height: 360px;
  padding: 22px;
  border: 1px solid rgba(255, 156, 226, 0.4);
  background:
    linear-gradient(180deg, rgba(38, 14, 60, 0.95) 0%, rgba(13, 8, 28, 0.96) 100%);
  box-shadow:
    0 0 28px rgba(255, 98, 194, 0.22),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.prologue-transition__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: #ffd6f6;
}

.prologue-transition__status {
  color: #ff9de2;
  text-shadow: 0 0 10px rgba(255, 125, 214, 0.4);
}

.prologue-transition__log {
  height: 220px;
  overflow: hidden;
  padding: 16px;
  border: 1px solid rgba(255, 156, 226, 0.18);
  background: rgba(255, 255, 255, 0.03);
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 0.84rem;
  line-height: 1.75;
  color: rgba(255, 247, 253, 0.94);
}

.prologue-transition__line {
  opacity: 0;
  transform: translateY(4px);
  animation: prologueTransitionLineIn 0.24s ease forwards;
}

.prologue-transition__line .accent {
  color: #ff9de2;
}

.prologue-transition__progress {
  width: 100%;
  height: 10px;
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid rgba(255, 156, 226, 0.22);
  background: rgba(255, 255, 255, 0.04);
}

.prologue-transition__progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, #8f4cff 0%, #ff86d5 100%);
  box-shadow: 0 0 18px rgba(255, 127, 212, 0.34);
  transition: width 0.24s ease;
}

.prologue-transition__label {
  margin-top: 12px;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: rgba(255, 237, 250, 0.78);
}

body.is-prologue-transitioning {
  opacity: 0;
  transition: opacity 0.32s ease;
}

@keyframes prologueTransitionLineIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 767px) {
  .prologue-transition__window {
    min-height: 320px;
    padding: 16px;
  }

  .prologue-transition__header {
    flex-direction: column;
    align-items: flex-start;
    font-size: 0.74rem;
  }

  .prologue-transition__log {
    height: 190px;
    font-size: 0.76rem;
  }
}

.index-page .mv-reserve-text {
  margin: 0;
  width: auto;
  max-width: min(96vw, 1100px);
  text-align: center;
  white-space: nowrap;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(38px, 4.1vw, 64px);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  text-shadow:
    0 0 5px rgba(255, 145, 230, 0.92),
    0 0 12px rgba(255, 95, 210, 0.72),
    0 0 22px rgba(255, 55, 190, 0.44);
  opacity: 0;
  animation: mvReserveTextFadeIn 1.8s ease 1.1s forwards;
}

@media (min-width: 768px) and (max-width: 1024px) {
  .index-page .mv-reserve-text {
    font-size: clamp(34px, 4.2vw, 40px);
  }
}

@media (max-width: 767px) {
  .index-page .mv-reserve-text {
    max-width: 96vw;
    font-size: clamp(28px, 5.2vw, 34px);
    letter-spacing: 0.03em;
  }
}

.index-page .mv-nameplate {
  width: min(100%, 1280px);
  height: 25px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-weight: 700;
}

.index-page .top-slider-section {
  width: min(100%, 1280px);
  margin: 18px auto 28px;
  padding: 0 18px;
  position: relative;
  z-index: 2;
}

.index-page .top-slider {
  border-radius: 14px;
  overflow: visible;
  border: 1px solid rgba(255, 180, 235, 0.58);
  box-shadow:
    0 0 22px rgba(255, 95, 210, 0.28),
    0 0 42px rgba(255, 95, 210, 0.12),
    inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  background: rgba(0, 0, 0, 0.34);
  transition: border-color 0.32s ease, box-shadow 0.32s ease;
}

.index-page .top-slider .slick-list {
  border-radius: 14px;
  overflow: hidden;
}

.index-page .top-slider:hover,
.index-page .top-slider:focus-within {
  border-color: rgba(170, 255, 210, 0.95);
  box-shadow:
    0 0 18px rgba(120, 255, 170, 0.48),
    0 0 38px rgba(70, 255, 145, 0.22),
    inset 0 0 0 1px rgba(220, 255, 235, 0.08);
}

.index-page .top-slider__item {
  outline: none;
}

.index-page .top-slider__link {
  display: block;
  text-decoration: none;
}

.index-page .top-slider__item img {
  display: block;
  width: 100%;
  height: auto;
}

.index-page .top-slider .slick-arrow {
  z-index: 3;
  width: 44px;
  height: 44px;
}

.index-page .top-slider .slick-prev {
  left: 16px;
}

.index-page .top-slider .slick-next {
  right: 16px;
}

.index-page .top-slider .slick-prev:before,
.index-page .top-slider .slick-next:before {
  font-size: 34px;
  color: #fff;
  text-shadow:
    0 0 5px rgba(255, 145, 230, 0.85),
    0 0 14px rgba(255, 95, 210, 0.55);
}

.index-page .top-slider .slick-dots {
  bottom: -34px;
}

.index-page .top-slider .slick-dots li button:before {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
  opacity: 0.7;
}

.index-page .top-slider .slick-dots li.slick-active button:before {
  color: #fff;
  opacity: 1;
  text-shadow:
    0 0 5px rgba(255, 145, 230, 0.8),
    0 0 12px rgba(255, 95, 210, 0.5);
}

@media (max-width: 767px) {
  .index-page .top-slider-section {
    margin: 12px auto 20px;
    padding: 0 12px;
  }

  .index-page .top-slider .slick-arrow {
    width: 36px;
    height: 36px;
  }

  .index-page .top-slider .slick-prev {
    left: 8px;
  }

  .index-page .top-slider .slick-next {
    right: 8px;
  }

  .index-page .top-slider .slick-prev:before,
  .index-page .top-slider .slick-next:before {
    font-size: 26px;
  }

  .index-page .top-slider .slick-dots {
    bottom: -28px;
  }

  .index-page .top-slider .slick-dots li button:before {
    font-size: 10px;
  }
}

.index-page .mv-nameplate {
  letter-spacing: 0.12em;
  font-size: clamp(12px, 1.1vw, 16px);
  color: #fff;
  background: linear-gradient(100deg, rgb(59, 44, 143) 0%, rgb(125, 45, 151) 35%, rgb(217, 77, 158) 68%, rgb(240, 106, 169) 100%);
  position: relative;
  z-index: 1;
}

.index-page .updates-section {
  width: min(100%, 1280px);
  margin: 0 auto;
  padding: 28px 18px 40px;
}

.index-page .updates-title {
  margin: 0 0 16px;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(22px, 2.2vw, 34px);
  letter-spacing: 0.08em;
  color: #fff;
  text-shadow: 0 0 10px rgba(255, 120, 220, 0.5);
}

.index-page .updates-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.index-page .update-card {
  border-radius: 12px;
  border: 1px solid rgba(255, 140, 225, 0.65);
  background: rgba(0, 0, 0, 0.58);
  padding: 14px 14px 13px;
  box-shadow:
    0 0 10px rgba(255, 110, 215, 0.25),
    inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.index-page .update-card time {
  display: block;
  margin-bottom: 6px;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(15px, 1.15vw, 18px);
  letter-spacing: 0.08em;
  color: #ffd8f5;
}

.index-page .update-card p {
  margin: 0;
  font-size: clamp(15px, 1.12vw, 17px);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.95);
}

.reveal-pop {
  opacity: 0;
  transform: translateY(18px) scale(0.94);
  transition: opacity 0.46s ease, transform 0.52s cubic-bezier(0.2, 0.9, 0.2, 1.15);
}

.reveal-pop.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@media (min-width: 768px) and (max-width: 1024px) {
  .index-page .updates-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .index-page .updates-section {
    padding: 20px 12px 28px;
  }

  .index-page .updates-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal-pop {
    opacity: 1;
    transition: none;
  }
}

.index-page .updates-toggle {
  display: none;
  margin: 6px auto 0;
  min-width: 122px;
  height: 34px;
  padding: 0 14px;
  border: 1px solid rgba(255, 170, 230, 0.85);
  border-radius: 12px;
  background: linear-gradient(100deg, rgba(95, 32, 124, 0.9) 0%, rgba(214, 78, 161, 0.9) 100%);
  color: #fff;
  cursor: pointer;
  box-shadow:
    0 0 10px rgba(255, 110, 215, 0.45),
    inset 0 0 0 1px rgba(255, 255, 255, 0.2);
  width: fit-content;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform 0.25s ease, filter 0.25s ease, box-shadow 0.25s ease;
}

.index-page .updates-toggle:hover {
  filter: brightness(1.08);
  box-shadow:
    0 0 12px rgba(120, 255, 170, 0.5),
    inset 0 0 0 1px rgba(255, 255, 255, 0.24);
}

.index-page .updates-toggle__text {
  display: inline-flex;
  align-items: center;
  height: 100%;
  line-height: 1;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.index-page .updates-toggle__chevron {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(45deg) translateY(-1px);
  transform-origin: center;
  letter-spacing: 0.02em;
  transition: transform 0.25s ease;
}

.index-page .updates-toggle.is-open .updates-toggle__chevron {
  transform: rotate(-135deg) translateY(-1px);
}

@media (max-width: 767px) {
  .index-page .updates-section.is-collapsed .updates-grid .update-card:nth-child(n + 4) {
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px) scale(0.96);
    padding-top: 0;
    padding-bottom: 0;
    margin: 0;
    border-width: 0;
    overflow: hidden;
  }

}

/* updates collapse: shared for pc/tablet/mobile */
.index-page .updates-grid .update-card {
  max-height: 260px;
  transition:
    max-height 0.45s ease,
    opacity 0.35s ease,
    transform 0.45s cubic-bezier(0.2, 0.9, 0.2, 1.1),
    padding 0.35s ease,
    margin 0.35s ease,
    border-width 0.25s ease;
}

.index-page .updates-section.is-collapsed .updates-grid .update-card.is-extra {
  max-height: 0;
  opacity: 0;
  transform: translateY(-10px) scale(0.96);
  padding-top: 0;
  padding-bottom: 0;
  margin: 0;
  border-width: 0;
  overflow: hidden;
}

.index-page .updates-section.has-toggle .updates-toggle {
  display: flex;
  margin-left: auto;
  margin-right: auto;
}

.index-page .mv-event-link {
  position: absolute;
  top: 160px;
  left: 50%;
  transform: translateX(-50%) translateY(16px) scale(0.96);
  z-index: 16;
  pointer-events: auto;
  overflow: hidden;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: "Oxanium", "M PLUS 1p", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(15px, 1.7vw, 20px);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #fff;
  text-shadow: 
    0 0 6px rgba(255, 145, 230, 0.95),
    0 0 14px rgba(255, 95, 210, 0.7);
  text-decoration: none;
  padding: 12px 36px;
  border: 1px solid rgba(255, 218, 248, 0.92);
  border-radius: 999px;
  background:
    linear-gradient(135deg, rgba(255, 114, 205, 0.92) 0%, rgba(129, 67, 255, 0.86) 48%, rgba(255, 76, 167, 0.92) 100%);
  box-shadow: 
    0 0 18px rgba(255, 95, 210, 0.48),
    0 0 38px rgba(138, 88, 255, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.28);

  opacity: 0;
  animation:
    mvEventLinkIntro 1.2s cubic-bezier(0.18, 0.9, 0.26, 1) 1.35s forwards,
    mvEventLinkFloatGlow 3.2s ease-in-out 2.6s infinite;
  transition: transform 0.32s ease, filter 0.32s ease, box-shadow 0.32s ease;
}

.index-page .mv-event-link::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(115deg, transparent 0%, transparent 34%, rgba(255, 255, 255, 0.78) 48%, transparent 62%, transparent 100%);
  transform: translateX(-120%);
  animation: mvEventLinkShine 4.2s ease-in-out 3.0s infinite;
  pointer-events: none;
}

.index-page .mv-event-link:hover,
.index-page .mv-event-link:focus-visible {
  filter: 
    drop-shadow(0 0 8px rgba(255, 244, 180, 0.95))
    drop-shadow(0 0 22px rgba(255, 112, 214, 0.68)) !important;
  box-shadow: 
    0 0 24px rgba(255, 214, 118, 0.52),
    0 0 48px rgba(255, 80, 190, 0.5),
    inset 0 0 0 1px rgba(255, 255, 255, 0.36) !important;
}

@keyframes mvEventLinkIntro {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(18px) scale(0.94);
    filter: blur(2px);
  }
  70% {
    opacity: 1;
    transform: translateX(-50%) translateY(-3px) scale(1.03);
    filter: blur(0);
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
    filter: blur(0);
  }
}

@keyframes mvEventLinkFloatGlow {
  0%,
  100% {
    transform: translateX(-50%) translateY(0) scale(1);
    filter: drop-shadow(0 0 5px rgba(255, 180, 238, 0.7));
    box-shadow:
      0 0 18px rgba(255, 95, 210, 0.48),
      0 0 38px rgba(138, 88, 255, 0.28),
      inset 0 0 0 1px rgba(255, 255, 255, 0.28);
  }
  50% {
    transform: translateX(-50%) translateY(-7px) scale(1.025);
    filter: drop-shadow(0 0 12px rgba(255, 239, 168, 0.92));
    box-shadow:
      0 0 26px rgba(255, 214, 118, 0.56),
      0 0 56px rgba(255, 74, 190, 0.5),
      inset 0 0 0 1px rgba(255, 255, 255, 0.38);
  }
}

@keyframes mvEventLinkShine {
  0%,
  42% {
    transform: translateX(-120%);
  }
  64%,
  100% {
    transform: translateX(120%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .index-page .mv-event-link::before {
    animation: none;
    display: none;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .index-page .mv-event-link {
    top: 150px;
    font-size: clamp(14px, 1.5vw, 18px);
    padding: 9px 26px;
  }
}

@media (max-width: 767px) {
  .index-page .mv-event-link {
    top: 55px;
    font-size: 14px;
    padding: 8px 20px;
  }
}

/* === master_up.png（左寄せ＋ブラウザサイズで可変） === */
.index-page .mv-master-up {
  position: absolute;
  /* 親の縦に対して中央配置する場合 */
  top: 62%;
  left: 5%;
  transform: translateY(-50%);
  z-index: 18;
  cursor: pointer;

  /* * 【改善点】横幅の基準を親要素（1280px max）に合わせるため、
   * % や vw を見直します。
   * PC〜タブレット帯：最小150px 〜 画面幅の22% 〜 最大280px
   */
  width: clamp(150px, 22vw, 280px);
  height: auto;

  opacity: 0;
  filter: drop-shadow(0 0 8px rgba(255, 236, 168, 0.42));
  animation:
    mvMasterUpFadeIn 1.2s ease 2.0s forwards,
    mvMasterUpFloatGlow 3.4s ease-in-out 3.0s infinite;
  will-change: transform, filter;
}

.index-page .mv-master-up:hover,
.index-page .mv-master-up:focus-visible {
  filter:
    brightness(1.12)
    drop-shadow(0 0 12px rgba(255, 248, 196, 0.95))
    drop-shadow(0 0 28px rgba(61, 219, 255, 0.62));
}

.index-page .mv-master-up:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.9);
  outline-offset: 6px;
}

@keyframes mvMasterUpFadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes mvMasterUpFloatGlow {
  0%,
  100% {
    transform: translateY(-50%) scale(1) rotate(-0.8deg);
    filter:
      brightness(1)
      drop-shadow(0 0 7px rgba(255, 236, 168, 0.48))
      drop-shadow(0 0 18px rgba(255, 105, 198, 0.34));
  }
  45% {
    transform: translateY(calc(-50% - 8px)) scale(1.035) rotate(1deg);
    filter:
      brightness(1.15)
      drop-shadow(0 0 13px rgba(255, 248, 196, 0.95))
      drop-shadow(0 0 32px rgba(61, 219, 255, 0.58));
  }
  58% {
    transform: translateY(calc(-50% - 5px)) scale(1.02) rotate(0.35deg);
    filter:
      brightness(1.28)
      drop-shadow(0 0 18px rgba(255, 255, 255, 0.98))
      drop-shadow(0 0 42px rgba(255, 74, 190, 0.68));
  }
}

@media (prefers-reduced-motion: reduce) {
  .index-page .mv-master-up {
    opacity: 1;
    animation: none;
  }
}

/* タブレット用（微調整が必要な場合） */
@media (min-width: 768px) and (max-width: 1024px) {
  .index-page .mv-master-up {
    left: 4%;
    top: 62%;
    width: clamp(120px, 24vw, 200px);
  }
}

/* スマホ用（ブレイクポイント 767px 以下） */
@media (max-width: 767px) {
  .index-page .mv-master-up {
    top: 64%;
    left: 6%; /* スマホ時は少し端に寄せる */
    /* * 【改善点】最小値を10px→60pxなど実用的なサイズに。
     * 画面幅の 25% 前後で追従させ、最大でも120px程度に抑えると綺麗です。
     */
    width: clamp(60px, 25vw, 120px);
  }
}

html.is-master-up-popup-open,
body.is-master-up-popup-open {
  overflow: hidden;
}

.index-page .master-up-popup[hidden] {
  display: none;
}

.index-page .master-up-popup {
  position: fixed;
  inset: 0;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(9, 5, 28, 0.78);
  opacity: 0;
  transition: opacity 0.24s ease;
}

.index-page .master-up-popup.is-open {
  opacity: 1;
}

.index-page .master-up-popup__panel {
  position: relative;
  width: min(725px, 92vw);
  max-height: 90vh;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.24s ease;
}

.index-page .master-up-popup.is-open .master-up-popup__panel {
  transform: translateY(0) scale(1);
}

.index-page .master-up-popup__image {
  display: block;
  width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border: 2px solid rgba(255, 255, 255, 0.86);
  box-shadow: 0 22px 72px rgba(0, 0, 0, 0.48);
}

.index-page .master-up-popup__close {
  position: absolute;
  top: -16px;
  right: -16px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid rgba(255, 255, 255, 0.88);
  border-radius: 50%;
  color: #ffffff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  background: linear-gradient(135deg, rgba(247, 74, 146, 0.95), rgba(84, 189, 255, 0.95));
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
}

.index-page .master-up-popup__close:hover,
.index-page .master-up-popup__close:focus-visible {
  transform: translateY(-1px);
}

@media (max-width: 767px) {
  .index-page .master-up-popup {
    padding: 18px;
  }

  .index-page .master-up-popup__panel {
    width: min(725px, 94vw);
  }

  .index-page .master-up-popup__close {
    top: -12px;
    right: -10px;
    width: 38px;
    height: 38px;
    font-size: 24px;
  }
}