/* ================================================
   HOME — home.css
   index.html 専用スタイル
   ※ Design Tokens は style.css の :root に定義済み
   ================================================ */


/* ================================================
   THEME — Home
   ================================================ */
body.theme--home {
  background-color: #FAFAFA;
  font-family: var(--font-helvetica);
  letter-spacing: 0;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}


/* ================================================
   HOME NAV — ヘッダー
   ================================================ */
.home-nav {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-gap-xl);
  padding: 64px 120px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: #FAFAFA;
  box-sizing: border-box;
  /* 初期状態: 非表示 */
  opacity: 0;
  transition: opacity 0.8s ease;
}

/* ページロード後に表示 */
.home-nav.is-visible {
  opacity: 1;
}

/* スクロール下方向で非表示 */
.home-nav.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.home-nav__title {
  font-family: var(--font-anonymous-pro);
  font-size: var(--size-pc-body);
  line-height: var(--lh-pc-body);
  color: #1C1C1C;
  flex: 1;
  min-width: 0;
  text-decoration: none;
}

.home-nav__link {
  display: flex;
  align-items: center;
  gap: var(--sp-gap-s);
  font-family: var(--font-anonymous-pro);
  font-size: var(--size-pc-body);
  line-height: var(--lh-pc-body);
  color: #1C1C1C;
  opacity: 0.5;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.home-nav__link-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: block;
}


/* ================================================
   HOME GRID — カードグリッド
   ================================================ */
.home-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
  padding: 192px 120px 120px;
}


/* ================================================
   HOME CARD — カード共通
   ================================================ */
.home-card {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #FFFFFF;
  overflow: hidden;
  position: relative;
  cursor: pointer;
  text-decoration: none;
}

/* 画像エリア */
.home-card__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: filter 0.3s ease;
}

/* hover: グレースケール + ブラー */
.home-card:hover .home-card__image {
  filter: grayscale(1) blur(4px);
}


/* ================================================
   HOME CARD OVERLAY — hover 時に表示
   ================================================ */
.home-card__overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(19, 20, 22, 0.5);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.home-card:hover .home-card__overlay {
  opacity: 1;
}

.home-card__overlay-info {
  display: flex;
  flex-direction: column;
  gap: var(--sp-gap-l);
  color: #FFFFFF;
}

.home-card__overlay-heading {
  display: flex;
  flex-direction: column;
  gap: var(--sp-gap-s);
}

.home-card__category {
  font-family: var(--font-helvetica);
  font-size: var(--size-pc-caption);
  font-weight: 400;
  line-height: var(--lh-pc-caption);
  letter-spacing: 0;
  opacity: 0.5;
}

.home-card__title {
  font-family: var(--font-helvetica);
  font-size: var(--size-pc-heading-xsmall);
  font-weight: 700;
  line-height: var(--lh-pc-heading-xsmall);
  letter-spacing: 0;
}

.home-card__desc {
  font-family: var(--font-helvetica);
  font-size: var(--size-pc-body);
  font-weight: 400;
  line-height: var(--lh-pc-body);
  letter-spacing: 0;
}

.home-card__date {
  font-family: var(--font-helvetica);
  font-size: var(--size-pc-body);
  font-weight: 400;
  line-height: var(--lh-pc-body);
  letter-spacing: 0;
}


/* ================================================
   ANIMATION — 登場アニメーション
   ================================================ */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* PC: 行ごとに fade-in-up */
.home-card:nth-child(1),
.home-card:nth-child(2) {
  opacity: 0;
  animation: fade-in-up 1s ease 0.5s forwards;
}

.home-card:nth-child(3),
.home-card:nth-child(4) {
  opacity: 0;
  animation: fade-in-up 1s ease 0.8s forwards;
}

.home-card:nth-child(5) {
  opacity: 0;
  animation: fade-in-up 1s ease 1.1s forwards;
}


/* ================================================
   Responsive — Home SP
   ================================================ */
@media (max-width: 768px) {

  .home-nav {
    padding: 32px var(--sp-pad-h-sp);
    gap: var(--sp-gap-l);
  }

  .home-nav__title {
    font-family: var(--font-helvetica);
    font-size: var(--size-sp-caption);
    line-height: var(--lh-sp-caption);
  }

  .home-nav__link {
    font-family: var(--font-anonymous-pro);
    font-size: var(--size-sp-body);
    line-height: var(--lh-sp-body);
  }

  .home-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-gap-l);
    padding: 96px var(--sp-pad-h-sp) var(--sp-pad-v-sp);
  }

  .home-card__overlay {
    padding: 24px;
  }

  .home-card__overlay-info {
    gap: var(--sp-gap-m);
  }

  .home-card__category {
    font-size: var(--size-sp-caption);
    line-height: var(--lh-sp-caption);
  }

  .home-card__title {
    font-size: var(--size-sp-body);
    font-weight: 700;
    line-height: var(--lh-sp-body);
  }

  .home-card__desc {
    font-size: var(--size-sp-body);
    line-height: var(--lh-sp-body);
  }

  .home-card__date {
    font-size: var(--size-sp-body);
    line-height: var(--lh-sp-body);
  }

  /* SP: 1枚ずつ fade-in-up */
  .home-card:nth-child(1) { animation-delay: 0.5s;  }
  .home-card:nth-child(2) { animation-delay: 0.7s;  }
  .home-card:nth-child(3) { animation-delay: 0.9s;  }
  .home-card:nth-child(4) { animation-delay: 1.1s;  }
  .home-card:nth-child(5) { animation-delay: 1.3s;  }

}