/* ===== Post TOC Sidebar ===== */
.post-wrapper {
  display: flex;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.toc-sidebar {
  position: sticky;
  top: 100px;
  height: calc(100vh - 120px);
  width: 220px;
  flex-shrink: 0;
  margin-right: 30px;
  overflow-y: auto;
  align-self: flex-start;
  z-index: 10;
  border-right: 1px solid var(--border-color);
  padding-right: 20px;
}

.toc-container {
  position: relative;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--primary-color);
  font-family: var(--font-secondary);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-color);
}

.toc-content {
  font-size: 0.9rem;
}

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

.toc-content li {
  margin-bottom: 8px;
  position: relative;
}

.toc-content a {
  color: var(--secondary-color);
  text-decoration: none;
  display: block;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.toc-content a:hover {
  color: var(--accent-color);
  background-color: color-mix(in srgb, var(--accent-color) 10%, transparent);
}

.toc-content a.active {
  color: var(--accent-color);
  font-weight: 500;
  background-color: color-mix(in srgb, var(--accent-color) 10%, transparent);
  border-left: 3px solid var(--accent-color);
}

/* TOC层级缩进 */
.toc-content .toc-h1 {
  padding-left: 5px;
}

.toc-content .toc-h2 {
  padding-left: 15px;
}

.toc-content .toc-h3 {
  padding-left: 30px;
}

.toc-content .toc-h4 {
  padding-left: 45px;
}

.toc-content .toc-h5 {
  padding-left: 60px;
}

.toc-content .toc-h6 {
  padding-left: 75px;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .toc-sidebar {
    display: none;
  }

  .post-wrapper {
    display: block;
  }

  .post-container {
    max-width: 800px;
    margin: 0 auto;
    padding: calc(var(--spacing-3xl) + var(--spacing-2xl)) var(--content-padding) var(--spacing-3xl);
  }
}

/* 移动端TOC按钮 */
@media (max-width: 1024px) {
  .mobile-toc-toggle {
    display: flex;
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .mobile-toc-toggle i {
    font-size: 20px;
  }

  .mobile-toc-toggle:hover {
    transform: scale(1.1);
  }


}

.mobile-toc-panel {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 80%;
  max-width: 300px;
  background-color: white;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
  z-index: 1001;
  padding: 20px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  visibility: hidden;
}

.mobile-toc-panel.active {
  transform: translateX(0);
  visibility: visible;
}

.mobile-toc-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
}

.mobile-toc-overlay.active {
  display: block;
}


@media (min-width: 1025px) {

  .mobile-toc-toggle,
  .mobile-toc-panel,
  .mobile-toc-overlay {
    display: none !important;
  }
}
/* =====================================================
   目录 v2:嵌套可折叠树 (toc-tree)
   结构: ul.toc-tree > li(.has-children) > .toc-row > [button.toc-caret] + a
                            └ ul(子层, 父级 .collapsed 时隐藏)
   ===================================================== */

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

.toc-content ul.toc-tree ul {
  padding-left: 0.9em;
  border-left: 1px solid var(--border-color, #e5e5e5);
  margin-left: 0.55em;
}

.toc-content li.has-children > .toc-row {
  display: flex;
  align-items: center;
}

.toc-content .toc-row a {
  flex: 1 1 auto;
  min-width: 0;
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis; /* ★ 长标题省略号截断,悬停 title 可看全文 */
}

.toc-content .toc-caret {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-right: 2px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--secondary-color, #999);
  cursor: pointer;
  font-size: 0.7rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: transform 0.25s ease, color 0.2s ease;
}

.toc-content .toc-caret::before {
  content: "▾";
}

.toc-content .toc-caret:hover {
  color: var(--accent-color, #ff6b6b);
  background: rgba(128, 128, 128, 0.12);
}

.toc-content li.has-children.collapsed > .toc-caret,
.toc-content li.collapsed > .toc-row .toc-caret {
  transform: rotate(-90deg);
}

.toc-content li.has-children > ul {
  display: block;
}

.toc-content li.has-children.collapsed > ul {
  display: none;
}

/* 旧扁平缩进样式对树结构不再需要,重置 */
.toc-content .toc-h1,
.toc-content .toc-h2,
.toc-content .toc-h3,
.toc-content .toc-h4,
.toc-content .toc-h5,
.toc-content .toc-h6 {
  padding-left: 0;
}

/* 移动端面板:同样的省略号与折叠行为,行高更松 */
.mobile-toc-panel .toc-content .toc-row a {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}