/* --------------------------------------------------
   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/zenkai_back.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. 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;
}

.reportBanner {
  display: block;
  max-width: 500px;
  margin: 2rem auto;
}

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

.backButton {
  display: block;
  margin-top: 2rem;
  padding: 10px;
  border-radius: 15px;
  background: var(--color-header);
}

.copyright {
  margin: 20px 0;
  color: var(--color-white);
  font-size: 0.65rem;
  text-align: center;
}

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

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

/* --------------------------------------------------
   7. 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/zenkai_back.png") center top / auto 100% no-repeat;
    pointer-events: none;
  }

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

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

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