/* ======================================
   TOC Sidebar — sticky outline on right
   策略：把 .wrapper 加宽到 1100px，
         正文限制在 780px，TOC 在右侧剩余空间
   ====================================== */

/* 扩宽页面内容区，为 TOC 腾出右侧位置 */
.page-content > .wrapper {
  max-width: 1100px;
}

.post-layout {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
}

.post-layout .post {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 780px;
}

/* ---------- TOC sidebar ---------- */
.toc-sidebar {
  width: 200px;
  flex-shrink: 0;
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  font-size: 0.8rem;
  line-height: 1.5;
}

.toc-container {
  padding: 0.4rem 0;
}

.toc-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #888;
  margin: 0 0 0.5rem;
  padding: 0 0.5rem;
  font-weight: 600;
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc li {
  margin: 0;
  padding: 0;
}

/* 按 heading 层级缩进：h1 不缩进且加粗，h2 缩进一级，h3/h4 依次递进 */
.toc li.toc-h1 { padding-left: 0; }
.toc li.toc-h1 > a { font-weight: 600; color: #333; }
.toc li.toc-h2 { padding-left: 0; }
.toc li.toc-h3 { padding-left: 0.75rem; }
.toc li.toc-h4 { padding-left: 1.5rem; }

.toc a {
  display: block;
  padding: 0.15rem 0.5rem;
  color: #666;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc a:hover {
  color: #2a7ae2;
}

.toc a.active {
  color: #2a7ae2;
  border-left-color: #2a7ae2;
  font-weight: 500;
}

/* 窄屏：隐藏 TOC，正文占满 */
@media (max-width: 1060px) {
  .toc-sidebar {
    display: none;
  }
  .page-content > .wrapper {
    max-width: 800px;
  }
  .post-layout .post {
    max-width: none;
  }
}

/* TOC 滚动条 */
.toc-sidebar::-webkit-scrollbar {
  width: 4px;
}
.toc-sidebar::-webkit-scrollbar-thumb {
  background: #ddd;
  border-radius: 2px;
}