/* wenxin-sidebar.css - 左侧导航栏：站点标题、导航菜单、社交图标 */
/* ── Sidebar: sticky left column (home/category/about/default) ─────────
 * Post pages are EXCLUDED — post.css positions the sidebar with
 * position: absolute beside the centered article instead. ─────────────── */
body:not(.page-post) .sidebar {
  position: sticky;
  top: var(--space-32);
  height: fit-content;
  min-height: calc(61.8vh - var(--space-32));
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.brand-area .site-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: var(--tracking-chinese);
  line-height: var(--leading-tight);
  display: flex;
  align-items: baseline;
  margin-bottom: var(--space-6);
}

.brand-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  margin-left: 4px;
  flex-shrink: 0;
  animation: pulseBrand 4s ease-in-out infinite;
}

.bio {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
}

.site-nav a {
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  width: fit-content;
}

.site-nav a::before {
  content: "—";
  margin-right: var(--space-2);
  color: transparent;
  transition: color var(--duration-fast);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text-primary);
}

.site-nav a.active::before,
.site-nav a:hover::before {
  color: var(--color-accent);
}

.sidebar-footer {
  margin-top: auto;
  display: flex;
  flex-direction: row;
  gap: var(--space-5);
  align-items: center;
  /* Avoid content being obscured by iOS Home Indicator */
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.social-icon {
  color: var(--color-text-muted);
  font-size: var(--icon-md);
  display: inline-flex;
  transition: color var(--duration-fast), transform var(--duration-fast);
  /* 搜索按钮复用本 class（<button>）：清除浏览器默认边框/背景/内边距 */
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

.social-icon:hover {
  color: var(--color-text-secondary);
}

/* Translate effect only on pointer devices — touch has no hover state */
@media (hover: hover) and (pointer: fine) {
  .social-icon:hover {
    transform: translateY(-2px);
  }
}