/**
 * 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: 3.6em;
}

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

.sts2-page-nav-title {
  font-size: 1.6em;
  font-weight: 700;
  color: #fff;
  text-align: center;
  margin: 0 0 1.8em;
  text-shadow: var(--sts2-border-thin) var(--sts2-border-thin)
    var(--sts2-border-thick) rgba(0, 0, 0, 0.8);
}

.sts2-page-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15em, 1fr));
  gap: var(--sts2-gap-lg);
  margin-top: 0.9em;
}

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

.sts2-page-nav-item {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--sts2-gradient-card);
  border-radius: var(--sts2-radius-xs);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  border: var(--sts2-border-thick) solid var(--sts2-border);
  box-shadow:
    0 0.25em 0.75em rgba(0, 0, 0, 0.4),
    inset 0 var(--sts2-border-thin) 0 var(--sts2-border);
}

.sts2-page-nav-item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: var(--sts2-border-thick);
  background: linear-gradient(
    90deg,
    transparent,
    var(--accent-color, var(--sts2-primary)),
    transparent
  );
  opacity: 0;
  transition: var(--sts2-transition);
}

.sts2-page-nav-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.3));
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sts2-page-nav-item:hover {
  transform: translateY(-0.5em);
  border-color: var(--sts2-border-hover);
  box-shadow:
    0 0.75em 1.5em rgba(0, 0, 0, 0.5),
    0 0 1.25em rgba(65, 105, 225, 0.2);
}

.sts2-page-nav-item:hover::before {
  opacity: 1;
}

.sts2-page-nav-item:hover::after {
  opacity: 0.6;
}

.sts2-page-nav-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    rgba(60, 70, 90, 0.6),
    rgba(40, 50, 70, 0.6)
  );
}

.sts2-page-nav-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at center,
    transparent 30%,
    rgba(0, 0, 0, 0.4)
  );
  z-index: 1;
  pointer-events: none;
  transition: all 0.3s;
}

.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: brightness(0.85) contrast(1.1);
}

.sts2-page-nav-item:hover .sts2-page-nav-image img {
  transform: scale(1.1);
  filter: brightness(1) contrast(1.15);
}

.sts2-page-nav-content {
  padding: 1.3em;
  text-align: center;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.5));
  position: relative;
}

.sts2-page-nav-content::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: var(--sts2-border-thin);
  background: linear-gradient(
    90deg,
    transparent,
    var(--sts2-border),
    transparent
  );
}

.sts2-page-nav .sts2-page-nav-content h3 {
  margin: 0;
  font-size: 0.95em;
  font-weight: 700;
  color: var(--sts2-text-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: var(--sts2-transition);
  text-shadow: var(--sts2-border-thin) var(--sts2-border-thin)
    var(--sts2-border-thick) rgba(0, 0, 0, 0.8);
  position: relative;
}

.sts2-page-nav-item:hover .sts2-page-nav-content h3 {
  color: #fff;
  text-shadow:
    var(--sts2-border-thin) var(--sts2-border-thin) var(--sts2-border-thick)
      rgba(0, 0, 0, 0.8),
    0 0 0.625em rgba(65, 105, 225, 0.4);
}

@media (max-width: 64em) {
  .sts2-page-nav-grid {
    grid-template-columns: repeat(auto-fill, minmax(15em, 1fr));
    gap: 1em;
  }

  .sts2-page-nav-content {
    padding: 1.1em;
  }

  .sts2-page-nav .sts2-page-nav-content h3 {
    font-size: var(--sts2-font-lg);
  }
}

@media (max-width: 48em) {
  .sts2-page-nav {
    margin-top: 2.25em;
  }

  .sts2-page-nav-title {
    font-size: 1.35em;
    margin-bottom: 1.3em;
  }

  .sts2-page-nav-grid {
    grid-template-columns: repeat(auto-fill, minmax(12em, 1fr));
    gap: var(--sts2-gap-sm);
  }

  .sts2-page-nav-item {
    border-radius: var(--sts2-radius-xs);
  }

  .sts2-page-nav-content {
    padding: var(--sts2-gap-lg);
  }

  .sts2-page-nav .sts2-page-nav-content h3 {
    font-size: var(--sts2-font-md);
    letter-spacing: 0.03em;
  }
}