/* --------------------------------------------------
   1. Design tokens / Base
-------------------------------------------------- */
:root {
  --color-accent: #e60024;
  --color-header: #ff4200;
  --color-nav: #4d4d4d;
  --color-text: #050505;
  --color-white: #fff;
  --content-width: 700px;
  --hero-width: 1000px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background: #000;
}

body {
  min-height: 100vh;
  background: #000 url("../img/back_black.png") center top / 100% auto fixed no-repeat;
  color: var(--color-text);
  font-family: "M PLUS 1p", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-feature-settings: "palt";
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------
   2. Sticky header
-------------------------------------------------- */
.dechauheaderWrapper {
  position: sticky;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 100%;
  margin-bottom: 1rem;
}

.dechauheader {
  background: var(--color-header);
}

.dechauheader a {
  display: block;
  padding: 10px;
}

.dechauheader img {
  width: min(80%, 400px);
  margin: 0 auto;
}

.dechauheaderContentsWrapper {
  background: var(--color-nav);
}

.dechauheaderContents {
  display: flex;
  justify-content: space-between;
  width: min(90%, 600px);
  margin: 0 auto;
}

.dechauheaderContents a {
  padding: 0.55em;
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 700;
}

/* --------------------------------------------------
   3. Main visual
-------------------------------------------------- */
.mainVisual {
  display: flex;
  justify-content: center;
}

.mainLogo {
  width: min(100%, var(--hero-width));
}

.mainLogoImage {
  width: 100%;
}

.mainDate {
  position: relative;
  z-index: 1;
  width: min(84%, 620px);
  margin: -5% auto 0;
  padding: 0.6em 1em;
  border: 4px solid var(--color-accent);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--color-text);
  font-size: clamp(1.1rem, 4vw, 2rem);
  font-weight: 900;
  text-align: center;
}

.sampleLabel {
  display: inline-block;
  margin-right: 0.5em;
  padding: 0.2em 0.55em;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.55em;
  letter-spacing: 0.08em;
  vertical-align: middle;
}

/* --------------------------------------------------
   4. Main content / Concept
-------------------------------------------------- */
.pageContent {
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0 auto;
}

.conceptIntro {
  margin: 1.5rem auto 2rem;
  padding: clamp(1.1rem, 4vw, 2rem);
  border: clamp(4px, 0.7vw, 7px) solid var(--color-accent);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

.conceptIntro h1 {
  padding-bottom: 0.65em;
  border-bottom: 5px solid var(--color-accent);
  color: var(--color-accent);
  font-size: clamp(1.45rem, 5vw, 2.65rem);
  font-weight: 900;
  line-height: 1.3;
  text-align: center;
}

.conceptIntro ul {
  display: grid;
  gap: 0.65em;
  margin-top: 1em;
  list-style: none;
}

.conceptIntro li {
  position: relative;
  padding-left: 1.45em;
  font-size: clamp(1rem, 3.2vw, 1.75rem);
  font-weight: 900;
  line-height: 1.55;
}

.conceptIntro li::before {
  content: "";
  position: absolute;
  top: 0.52em;
  left: 0.08em;
  width: 0.72em;
  height: 0.72em;
  background: var(--color-accent);
  transform: rotate(45deg);
}

/* --------------------------------------------------
   5. Hall original projects
-------------------------------------------------- */
.kikakuSection {
  position: relative;
  left: 50%;
  width: min(calc(100vw - 2rem), 1180px);
  margin: clamp(2rem, 7vw, 4.5rem) auto 3rem;
  padding: clamp(1rem, 3vw, 1.75rem);
  border: 0;
  background: transparent;
  transform: translateX(-50%);
}

.kikakuHeading {
  position: relative;
  margin-bottom: clamp(1.5rem, 5vw, 2.75rem);
  color: var(--color-white);
  text-align: center;
}

.kikakuHeading__eyebrow {
  display: block;
  margin-bottom: 0.45rem;
  color: #ffbc2c;
  font-size: clamp(0.58rem, 1.8vw, 0.78rem);
  font-weight: 900;
  letter-spacing: 0.32em;
}

.kikakuHeading h1 {
  display: inline-block;
  padding: 0 0.15em 0.22em;
  background: linear-gradient(105deg, #fff 12%, #fff3c0 42%, #fff 70%);
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 3px 0 rgba(0, 0, 0, 0.55));
  font-size: clamp(1.55rem, 6vw, 3rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.kikakuHeading h1::after {
  content: "";
  display: block;
  width: 72%;
  height: 1px;
  margin: 0.25rem auto 1.15rem;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.95) 18%, #fff 50%, rgba(255, 255, 255, 0.95) 82%, transparent);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.35);
}

.kikakuHeading__spark {
  position: absolute;
  top: 18%;
  right: 9%;
  width: 16px;
  aspect-ratio: 1;
  background: #fff8bf;
  clip-path: polygon(50% 0, 59% 40%, 100% 50%, 59% 60%, 50% 100%, 41% 60%, 0 50%, 41% 40%);
  filter: drop-shadow(0 0 8px #ffd754);
  animation: titleSpark 2.4s ease-in-out infinite;
}

.kikakuGallery {
  --kikaku-card-ratio: 3 / 4;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: clamp(0.85rem, 3vw, 1.35rem);
  perspective: 1400px;
}

.kikakuItem {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.kikakuCard {
  display: block;
  position: relative;
  width: 100%;
  aspect-ratio: var(--kikaku-card-ratio);
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 5px;
  background: #151515;
  box-shadow:
    0 14px 26px rgba(0, 0, 0, 0.48),
    inset 0 0 0 1px rgba(255, 190, 70, 0.22);
  opacity: 0;
  transform: rotateY(-100deg) rotateX(12deg) translateY(34px) scale(0.78);
  transform-origin: 50% 75%;
  transform-style: preserve-3d;
  will-change: transform, opacity;
}

.kikakuCard.isVisible {
  animation: cardFlipIn 1.05s var(--card-delay) cubic-bezier(0.2, 0.82, 0.2, 1.15) forwards;
}

.kikakuCard.isReady {
  opacity: 1;
  transform: none;
  animation: none;
}

.kikakuCard:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 4px;
}

.kikakuResultButton {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45em;
  width: min(82%, 180px);
  min-height: 36px;
  margin: 0.5rem auto 0;
  padding: 0.48em 0.65em 0.48em 0.9em;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  background: #ff4200;
  box-shadow:
    0 5px 0 #780014,
    0 9px 16px rgba(0, 0, 0, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  color: #fff;
  font-size: clamp(0.68rem, 1.55vw, 0.82rem);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.35;
  text-align: center;
  text-shadow: 0 1px 2px rgba(90, 0, 10, 0.7);
  transition: transform 0.18s ease, filter 0.18s ease, box-shadow 0.18s ease;
}

.kikakuResultButton::after {
  content: "›";
  display: grid;
  place-items: center;
  width: 1.55em;
  height: 1.55em;
  border-radius: 50%;
  background: #fff;
  color: #d50022;
  font-size: 1.15em;
  line-height: 1;
  text-shadow: none;
  transition: transform 0.18s ease;
}

.kikakuResultButton:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 3px;
}

@media (hover: hover) {
  .kikakuResultButton:hover {
    filter: brightness(1.14) saturate(1.1);
    box-shadow: 0 6px 0 #780014, 0 12px 22px rgba(0, 0, 0, 0.45), 0 0 20px rgba(255, 60, 28, 0.5);
    transform: translateY(-2px) scale(1.025);
  }

  .kikakuResultButton:hover::after {
    transform: translateX(2px);
  }
}

.kikakuResultButton:active {
  box-shadow: 0 2px 0 #780014, 0 5px 9px rgba(0, 0, 0, 0.35);
  transform: translateY(3px) scale(0.98);
}

.kikakuCard__blur,
.kikakuCard__image,
.kikakuCard__shade,
.kikakuCard__shine {
  position: absolute;
  inset: 0;
}

.kikakuCard__blur {
  inset: -9%;
  width: 118%;
  height: 118%;
  object-fit: cover;
  filter: blur(20px) saturate(1.35) brightness(0.62);
  transform: scale(1.1);
}

.kikakuCard__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 14px rgba(0, 0, 0, 0.55));
  transform: translateZ(1px);
}

.kikakuCard__shade {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.22), transparent 20%, transparent 75%, rgba(0, 0, 0, 0.28)),
    linear-gradient(to top, rgba(0, 0, 0, 0.18), transparent 35%);
  pointer-events: none;
}

.kikakuCard__shine {
  left: -170%;
  width: 78%;
  background: linear-gradient(105deg, transparent 12%, rgba(255, 255, 255, 0.12) 34%, rgba(255, 255, 255, 0.95) 48%, rgba(255, 225, 115, 0.32) 62%, transparent 82%);
  filter: blur(1px);
  opacity: 0;
  pointer-events: none;
  transform: skewX(-18deg);
}

.kikakuCard.isVisible .kikakuCard__shine {
  animation: cardShine 0.8s calc(var(--card-delay) + 0.48s) ease-out forwards;
}

@media (hover: hover) {
  .kikakuCard.isReady {
    transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
  }

  .kikakuCard.isReady:hover {
    z-index: 2;
    border-color: #ffd76a;
    box-shadow: 0 20px 38px rgba(0, 0, 0, 0.62), 0 0 28px rgba(255, 118, 34, 0.42);
    transform: translateY(-8px) rotateZ(1deg) scale(1.025);
  }
}

@keyframes cardFlipIn {
  0% {
    opacity: 0;
    transform: rotateY(-100deg) rotateX(12deg) translateY(34px) scale(0.78);
  }
  62% {
    opacity: 1;
    transform: rotateY(8deg) rotateX(-2deg) translateY(-7px) scale(1.035);
  }
  82% {
    transform: rotateY(-3deg) translateY(2px) scale(0.99);
  }
  100% {
    opacity: 1;
    transform: none;
  }
}

@keyframes cardShine {
  0% { left: -170%; opacity: 0; }
  22% { opacity: 0.95; }
  100% { left: 190%; opacity: 0; }
}

@keyframes titleSpark {
  0%, 100% { opacity: 0.45; transform: rotate(0deg) scale(0.7); }
  50% { opacity: 1; transform: rotate(90deg) scale(1.25); }
}

/* --------------------------------------------------
   6. Schedule / Links
-------------------------------------------------- */
.embeddedWrap {
  display: flex;
  margin-bottom: 2rem;
  overflow: hidden;
  border: 2px solid #777;
  border-radius: 10px;
  background: var(--color-white);
}

.embeddedSchedule {
  width: 100%;
  height: 85vh;
  border: 0;
}

.siteFooter {
  width: 100%;
  margin-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.55);
  background: var(--color-header);
  box-shadow:
    0 -10px 28px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.footerContent {
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0 auto;
  padding: clamp(1.75rem, 5vw, 2.75rem) 0 calc(1.25rem + env(safe-area-inset-bottom));
}

.reportBanner {
  display: block;
  max-width: 500px;
  margin: 0 auto;
}

.reportBanner img,
.backButton img {
  width: 100%;
}

.backButton {
  display: block;
  max-width: 500px;
  margin: 1.5rem auto 0;
  padding: 20px 10px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 15px;
  background: black;
}

.copyright {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 1.75rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.32);
  color: var(--color-white);
  font-size: clamp(0.65rem, 1.8vw, 0.78rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.6;
  text-align: center;
  text-shadow: 0 1px 2px rgba(90, 20, 0, 0.42);
}

/* --------------------------------------------------
   7. Animation
-------------------------------------------------- */
.fadeInUp {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.2s ease, transform 1.2s ease;
}

.fadeInUp.isVisible {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------
   8. Responsive
-------------------------------------------------- */
@media (max-width: 600px) {
  body {
    position: relative;
    min-height: 100dvh;
    isolation: isolate;
    background: transparent;
  }

  body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: #000 url("../img/back_black.png") center top / cover no-repeat;
    pointer-events: none;
  }

  .dechauheaderContents a {
    font-size: 0.8rem;
  }

  .mainDate {
    margin-top: -3%;
    border-width: 3px;
  }

  .kikakuSection {
    width: calc(100vw - 1rem);
    padding: 1rem 0.75rem 1.25rem;
  }

  .kikakuGallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .kikakuHeading__spark {
    right: 3%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fadeInUp,
  .kikakuCard {
    opacity: 1;
    transform: none;
    transition: none;
    animation: none;
  }

  .kikakuCard.isVisible .kikakuCard__shine,
  .kikakuHeading__spark {
    animation: none;
  }
}