/* リセット */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 全体 */
body {
  background: #000;
  color: #fff;
  overflow-x: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue",
               "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

/* 背景動画ラッパー */
.bg-wrapper {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

/* 共通動画 */
.bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.6s ease;
}

/* 表示中 */
.bg-video.active {
  opacity: 1;
}

/* ヒーロー */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* ヒーローUI */
.ui {
  transition: opacity 1.4s ease;
}

.ui.hidden {
  opacity: 0;
}

.ui.show {
  opacity: 1;
}

.ui h1 {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 3.2rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  margin-bottom: 0.6em;
}

.ui p {
  opacity: 0.8;
}

/* セクション */
.section {
  min-height: 100vh;
  padding: 140px 8vw;
}

/* フェード対象 */
.fade-target {
  opacity: 0;
  transform: translateY(80px);
  transition: opacity 1.2s ease, transform 1.2s ease;
}

.fade-target.show {
  opacity: 1;
  transform: translateY(0);
}

.section h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* 静止画背景 */
.bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.6s ease;
}

/* 表示状態 */
.bg-image.active {
  opacity: 1;
}

/* 微動アニメーション（静止画用） */
@keyframes slowZoom {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.08);
  }
}

/* About 背景が表示中のときだけ動かす */
.bg-image.active {
  animation: slowZoom 28s ease-in-out infinite alternate;
}


/* 文字の微動アニメーション */
@keyframes floatText {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-8px);
  }
}

/* ヒーロー文字が表示中だけ動かす */
.ui.show {
  animation: floatText 14s ease-in-out infinite alternate;
}