/**
 * STS2 Page Navigation Widget CSS
 * 目的: ページナビゲーションウィジェットのスタイル
 * 依存: sts2-variables.css
 */

.sts2-page-nav {
  margin-top: 1.2em;
}

.sts2-page-nav-container {
  max-width: 75em;
  margin: 0 auto;
}

.sts2-page-nav-title {
  grid-column: 1 / -1;
  margin: 0 !important;
  padding: 0.55em 1em;
  font-size: 0.72em;
  font-weight: 700;
  color: #fff;
  text-align: center;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--sts2-gradient-card);
  border-radius: var(--sts2-radius-xs);
  border: var(--sts2-border-thick) solid var(--sts2-border);
  box-shadow: 0 0.25em 0.75em rgba(0, 0, 0, 0.45);
}

.sts2-page-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15em, 1fr));
  gap: 0.6em;
  margin-top: 0;
}

.article .sts2-page-nav-grid {
  grid-template-columns: repeat(auto-fill, minmax(14em, 1fr));
}

/* ========================================
   カードアイテム（フルカバー型）
======================================== */
.sts2-page-nav-item {
  position: relative;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border-radius: var(--sts2-radius-xs);
  border: var(--sts2-border-thick) solid var(--sts2-border);
  box-shadow: 0 0.25em 0.75em rgba(0, 0, 0, 0.45);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.3s ease,
              box-shadow 0.3s ease;
  text-decoration: none;
}

.sts2-page-nav-item:hover {
  transform: translateY(-0.2em);
  border-color: var(--sts2-border-hover);
  box-shadow: 0 0.5em 1.5em rgba(0, 0, 0, 0.55);
}

/* ========================================
   画像（カード全体を覆う）
======================================== */
.sts2-page-nav-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sts2-page-nav-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              filter 0.3s ease;
  filter: brightness(0.75) contrast(1.1);
}

.sts2-page-nav-item:hover .sts2-page-nav-image img {
  transform: scale(1.05);
  filter: brightness(0.9) contrast(1.1);
}

/* ========================================
   テキスト（画像上のオーバーレイ）
======================================== */
.sts2-page-nav-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2.5em 0.85em 0.7em;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.85) 0%,
    rgba(0, 0, 0, 0.45) 55%,
    transparent 100%
  );
  transition: background 0.3s ease;
}

.sts2-page-nav-item:hover .sts2-page-nav-content {
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.75) 0%,
    rgba(0, 0, 0, 0.3) 55%,
    transparent 100%
  );
}

.sts2-page-nav .sts2-page-nav-content h3 {
  margin: 0;
  border: none;
  padding: 0;
  font-size: 0.85em;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-shadow: 0 0.05em 0.4em rgba(0, 0, 0, 0.9);
  transition: letter-spacing 0.3s ease;
}

.sts2-page-nav-item:hover .sts2-page-nav-content h3 {
  letter-spacing: 0.07em;
}

/* ========================================
   レスポンシブ
======================================== */
@media (max-width: 64em) {
  .sts2-page-nav-grid {
    gap: 0.5em;
  }

  .sts2-page-nav .sts2-page-nav-content h3 {
    font-size: 0.8em;
  }
}

@media (max-width: 48em) {
  .sts2-page-nav {
    margin-top: 0.8em;
  }

  .sts2-page-nav-title {
    display: none;
  }

  .sts2-page-nav-grid {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.6em;
    padding-bottom: 0.8em;
    margin-inline: calc(50% - 50vw);
    padding-inline: calc(50vw - 50%);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-top: 0;
  }

  .sts2-page-nav-grid::-webkit-scrollbar {
    display: none;
  }

  .sts2-page-nav-item {
    flex: 0 0 auto;
    width: 10.5em;
  }

  .sts2-page-nav .sts2-page-nav-content h3 {
    font-size: 0.78em;
    letter-spacing: 0.01em;
  }
}