/**
 * STS2 Sidebar Navigation Widget CSS
 * 目的: サイドバーナビゲーションウィジェットのスタイル
 * 依存: sts2-variables.css
 */

.sts2-sidebar-nav {
  margin: 0;
  padding: 0;
}

.sts2-sidebar-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--sts2-gap-sm);
  margin: 0;
  padding: 0;
  list-style: none;
}

.sts2-sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--sts2-gap-md);
  padding: var(--sts2-padding-md);
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.98),
    rgba(250, 250, 252, 0.95)
  );
  border-left: var(--sts2-border-thick) solid rgba(0, 0, 0, 0.1);
  border-radius: 0 var(--sts2-radius-xs) var(--sts2-radius-xs) 0;
  text-decoration: none;
  transition: all 0.25s ease;
  box-shadow: 0 var(--sts2-border-thin) 0.25em rgba(0, 0, 0, 0.06);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(0.5em);
  border-top: var(--sts2-border-thin) solid rgba(0, 0, 0, 0.04);
  border-right: var(--sts2-border-thin) solid rgba(0, 0, 0, 0.04);
  border-bottom: var(--sts2-border-thin) solid rgba(0, 0, 0, 0.04);
  animation: slideIn 0.3s ease forwards;
}

.sts2-sidebar-nav-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    var(--sts2-text-muted),
    rgba(245, 245, 250, 0.3)
  );
  opacity: 0;
  transition: opacity 0.25s ease;
}

.sts2-sidebar-nav-item:hover {
  transform: translateX(0.25em);
  border-left-color: rgba(0, 0, 0, 0.2);
  box-shadow:
    0 var(--sts2-border-base) 0.5em rgba(0, 0, 0, 0.1),
    -var(--sts2-border-base) 0 0.5em rgba(0, 0, 0, 0.04);
}

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

.sts2-sidebar-nav-thumb {
  flex-shrink: 0;
  width: 3.15em;
  height: 3.15em;
  border-radius: var(--sts2-radius-xs);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.04);
  border: var(--sts2-border-thin) solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 var(--sts2-border-thin) var(--sts2-border-thick)
    rgba(0, 0, 0, 0.06);
}

.sts2-sidebar-nav-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease;
  opacity: 0.95;
}

.sts2-sidebar-nav-item:hover .sts2-sidebar-nav-thumb img {
  transform: scale(1.05);
  opacity: 1;
}

.sts2-sidebar-nav-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sts2-gap-sm);
  min-width: 0;
}

.sts2-sidebar-nav-title {
  flex: 1;
  font-size: var(--sts2-font-md);
  font-weight: 600;
  color: #333;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.25s ease;
}

.sts2-sidebar-nav-item:hover .sts2-sidebar-nav-title {
  color: #111;
}

.sts2-sidebar-nav-arrow {
  flex-shrink: 0;
  width: 1.1em;
  height: 1.1em;
  opacity: 0;
  transform: rotate(-90deg) translateX(var(--sts2-border-base));
  transition: all 0.25s ease;
}

.sts2-sidebar-nav-arrow svg {
  width: 100%;
  height: 100%;
  fill: #666;
}

.sts2-sidebar-nav-item:hover .sts2-sidebar-nav-arrow {
  opacity: 0.5;
  transform: rotate(-90deg) translateX(0);
}

.sts2-sidebar-nav-item:hover .sts2-sidebar-nav-arrow svg {
  fill: #333;
}

.sts2-sidebar-nav-item:not(:has(.sts2-sidebar-nav-thumb)) {
  padding: 1em 0.75em;
}

.sts2-sidebar-nav-item:not(:has(.sts2-sidebar-nav-thumb))
  .sts2-sidebar-nav-title {
  font-size: 0.95em;
}

.sts2-sidebar-nav-item.current-page {
  border-left-color: rgba(0, 0, 0, 0.25);
  background: rgba(0, 0, 0, 0.03);
}

.sts2-sidebar-nav-item.current-page .sts2-sidebar-nav-title {
  color: #111;
  font-weight: 700;
}

.sts2-sidebar-nav-item.current-page .sts2-sidebar-nav-arrow {
  opacity: 0.6;
  transform: translateX(0);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-1em);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.sts2-sidebar-nav-item:nth-child(1) {
  animation-delay: 0.05s;
}
.sts2-sidebar-nav-item:nth-child(2) {
  animation-delay: 0.1s;
}
.sts2-sidebar-nav-item:nth-child(3) {
  animation-delay: 0.15s;
}
.sts2-sidebar-nav-item:nth-child(4) {
  animation-delay: 0.2s;
}
.sts2-sidebar-nav-item:nth-child(5) {
  animation-delay: 0.25s;
}
.sts2-sidebar-nav-item:nth-child(6) {
  animation-delay: 0.3s;
}

@media (max-width: 64em) {
  .sts2-sidebar-nav {
    position: static;
    margin-bottom: 2em;
  }
}

@media (max-width: 48em) {
  .sts2-sidebar-nav {
    padding: 1.1em;
  }

  .sts2-sidebar-nav h3 {
    font-size: var(--sts2-font-lg);
    margin-bottom: var(--sts2-gap-lg);
  }

  .sts2-sidebar-nav-link {
    padding: 0.55em 0.75em;
    font-size: var(--sts2-font-base);
  }

  .sts2-sidebar-nav-icon {
    font-size: var(--sts2-font-xl);
  }
}