/* 文章详情页 — 对应 Figma「文章」图层 (node 2:2) */
:root {
  --detail-text: #181818;
  --detail-muted: #73777a;
  --detail-muted2: #999;
  --detail-link: #1366ec;
  --detail-border: #e9e9e9;
  --detail-border-strong: #181818;
  --detail-sidebar-bg: #fff;
  --detail-active-bg: #f7f9fc;
  --detail-nav-item: #3d3d3d;
  --detail-page-max: 1886px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--detail-text);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--detail-link);
}

.detail-page {
  display: flex;
  min-height: 100vh;
  width: 100%;
  margin: 0 auto;
}

/* —— 左侧目录 —— */
.detail-sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--detail-sidebar-bg);
  display: flex;
  flex-direction: column;
  max-height: 100vh;
  position: sticky;
  top: 0;
  align-self: flex-start;
}

.detail-sidebar__search {
  padding: 22px 24px 12px;
  border-bottom: 1px solid var(--detail-border);
}

.detail-sidebar__search input {
  width: 100%;
  height: 32px;
  padding: 0 12px;
  border: 1px solid #eaeaea;
  border-radius: 2px;
  font-size: 13px;
  color: #999;
}

.detail-sidebar__search input::placeholder {
  color: #999;
}

.detail-sidebar__nav {
  flex: 1;
  overflow-y: auto;
  padding: 0 24px 48px;
}

/* —— 侧栏：分段 + 可折叠子级（原生 details） —— */
.detail-nav-section {
  border-bottom: 1px solid var(--detail-border);
  padding: 14px 0 18px;
}

.detail-nav-section:last-child {
  border-bottom: none;
}

.detail-nav-section__title {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 700;
  line-height: 22px;
  color: var(--detail-text);
  letter-spacing: 0.2px;
}

.detail-nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-nav-list__item {
  margin: 0;
}

.detail-nav-list__link {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  line-height: 22px;
  letter-spacing: 0.2px;
  color: var(--detail-nav-item);
}

.detail-nav-list__link:hover {
  color: var(--detail-link);
}

.detail-nav-list__link.is-active {
  color: var(--detail-link);
  font-weight: 500;
}

.detail-nav-branch {
  margin: 0;
  border: 0;
  padding: 0;
}

.detail-nav-branch + .detail-nav-branch {
  margin-top: 2px;
}

.detail-nav-branch__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  line-height: 22px;
  color: var(--detail-nav-item);
  letter-spacing: 0.2px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.detail-nav-branch__summary::-webkit-details-marker {
  display: none;
}

.detail-nav-branch__summary::marker {
  content: "";
}

.detail-nav-branch__label {
  flex: 1;
  min-width: 0;
}

.detail-nav-branch__chevron {
  flex-shrink: 0;
  width: 1em;
  text-align: right;
  color: var(--detail-muted2);
}

.detail-nav-branch__chevron::before {
  content: "\203a";
  display: inline-block;
  font-size: 15px;
  line-height: 1;
  transition: transform 0.18s ease;
}

.detail-nav-branch[open] > .detail-nav-branch__summary .detail-nav-branch__chevron::before {
  transform: rotate(90deg);
}

.detail-nav-branch__summary:hover {
  color: var(--detail-text);
}

.detail-nav-branch__summary:hover .detail-nav-branch__chevron {
  color: var(--detail-muted);
}

.detail-nav-branch__panel {
  padding: 2px 0 6px 12px;
  margin: 0;
}

.detail-nav-branch__panel > .detail-nav-list {
  margin-bottom: 4px;
}

.detail-nav-leaf {
  margin-top: 6px;
  padding-left: 0;
}

.detail-nav-leaf__title {
  margin: 8px 0 4px;
  font-size: 13px;
  font-weight: 600;
  line-height: 20px;
  color: var(--detail-text);
}

/* —— 主栏与正文 —— */
.detail-main-wrap {
  flex: 1;
  min-width: 0;
  border-right: 1px solid var(--detail-border);
  display: flex;
  flex-direction: column;
  border-left: 4px solid #fff;
  box-shadow: inset 1px 0 0 var(--detail-border);
}

.detail-main {
  flex: 1;
  padding: 20px 24px 48px;
}

.detail-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0 0 18px;
  font-size: 12px;
  line-height: 18px;
}

.detail-breadcrumb a {
  color: var(--detail-muted);
}

.detail-breadcrumb > a:first-of-type {
  color: #000;
}

.detail-breadcrumb__current {
  color: var(--detail-muted);
}

.detail-breadcrumb__sep {
  display: inline-block;
  flex-shrink: 0;
  width: 6px;
  height: 10px;
  margin: 0 6px;
  vertical-align: middle;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='6' height='10' fill='none'%3E%3Cpath d='M1 1l4 4-4 4' stroke='%2373777a' stroke-width='1.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
}

.detail-title {
  margin: 0 0 8px;
  font-size: 26px;
  line-height: 44px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  margin-bottom: 24px;
  font-size: 12px;
  line-height: 14px;
  color: var(--detail-muted2);
}

.detail-meta a {
  color: var(--detail-muted2);
}

.detail-meta a:hover {
  color: var(--detail-link);
}

.detail-article {
  font-size: 14px;
  line-height: 24px;
  letter-spacing: 0.4px;
  max-width: 1279px;
}

.detail-article table {
  width: 100%;
  margin: 16px 0;
  border-collapse: collapse;
}

.detail-article th,
.detail-article td {
  border: 1px solid var(--detail-border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}

.detail-article th {
  background: var(--detail-active-bg);
  font-weight: 600;
}

.detail-meta__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.detail-section {
  padding-top: 17px;
  border-top: 1px solid var(--detail-border);
  margin-bottom: 0;
}

.detail-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

.detail-section__heading {
  margin: 0 0 16px;
  font-size: 18px;
  line-height: 32px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.detail-h3 {
  margin: 24px 0 12px;
  font-size: 16px;
  line-height: 24px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.detail-h3:first-child {
  margin-top: 0;
}

.detail-prose {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 24px;
  letter-spacing: 0.4px;
  max-width: 1279px;
}

.detail-prose:last-child {
  margin-bottom: 0;
}

.detail-footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #d7d8d9;
  font-size: 14px;
  line-height: 16px;
}

.detail-feedback {
  margin-top: 32px;
  padding-bottom: 40px;
  text-align: center;
}

.detail-feedback p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 24px;
  color: #717171;
  font-weight: 500;
}

.detail-feedback button {
  height: 24px;
  min-width: 52px;
  padding: 0 14px;
  font-size: 12px;
  line-height: 22px;
  color: var(--detail-link);
  background: #fff;
  border: 1px solid var(--detail-link);
  border-radius: 2px;
  cursor: pointer;
}

.detail-feedback button:hover {
  background: rgba(19, 102, 236, 0.06);
}

/* —— 右侧本页导读 —— */
.detail-toc {
  width: 258px;
  flex-shrink: 0;
  padding: 20px 16px 48px 24px;
  position: sticky;
  top: 0;
  align-self: flex-start;
  max-height: 100vh;
  overflow-y: auto;
}

.detail-toc__title {
  margin: 0 0 20px;
  font-size: 18px;
  line-height: 26px;
  font-weight: 500;
  color: var(--detail-muted2);
}

.detail-toc__title span {
  display: inline-block;
  font-size: 12px;
  line-height: 1;
  color: #fff;
  background: var(--detail-link);
  padding: 3px 6px;
  border-radius: 4px;
  margin-left: 4px;
  vertical-align: middle;
}

.detail-toc__block {
  margin-bottom: 20px;
}

.detail-toc__block-title {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 20px;
  font-weight: 400;
}

.detail-toc__block-title::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 2px;
  background: var(--detail-link);
  margin-top: 8px;
  flex-shrink: 0;
}

.detail-toc__block-title.is-muted::before {
  background: rgba(150, 150, 150, 0.8);
}

.detail-toc__block-title a {
  color: var(--detail-link);
}

.detail-toc__block-title.is-muted a {
  color: #666;
}

.detail-toc ul {
  margin: 0;
  padding: 0 0 0 10px;
  list-style: none;
  border-left: 1px solid #eaeaea;
}

.detail-toc li {
  margin: 0;
  padding: 6px 0 6px 12px;
  font-size: 12px;
  line-height: 20px;
  color: var(--detail-muted2);
}

.detail-toc li a:hover {
  color: var(--detail-link);
}

/* —— 全站搜索页（search.html） —— */
.detail-searchbar {
  margin-bottom: 28px;
  max-width: 640px;
}

.detail-searchbar form {
  display: flex;
  gap: 10px;
  align-items: center;
}

.detail-searchbar input[type="search"] {
  flex: 1;
  min-width: 0;
  height: 40px;
  padding: 0 14px;
  border: 1px solid var(--detail-border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
}

.detail-searchbar button {
  height: 40px;
  padding: 0 18px;
  font-size: 14px;
  cursor: pointer;
  border: none;
  border-radius: 4px;
  background: var(--detail-link);
  color: #fff;
  font-family: inherit;
}

.detail-searchbar button:hover {
  filter: brightness(1.05);
}

.detail-search-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-search-list__item {
  padding: 16px 0;
  border-bottom: 1px solid var(--detail-border);
}

.detail-search-list__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
}

.detail-search-list__title a {
  color: var(--detail-link);
  text-decoration: none;
}

.detail-search-list__title a:hover {
  text-decoration: underline;
}

.detail-search-list__meta {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--detail-muted2);
}

.detail-search-list__excerpt {
  margin: 0;
  font-size: 13px;
  line-height: 22px;
  color: var(--detail-muted);
}

.detail-search-empty,
.detail-search-hint {
  margin: 24px 0;
  font-size: 14px;
  line-height: 24px;
  color: var(--detail-muted);
}

.detail-search-pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-top: 32px;
  font-size: 13px;
}

.detail-search-pager a {
  color: var(--detail-link);
  text-decoration: none;
}

.detail-search-pager a:hover {
  text-decoration: underline;
}

@media (max-width: 1200px) {
  .detail-page {
    flex-direction: column;
  }

  .detail-sidebar {
    position: relative;
    max-height: none;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--detail-border);
  }

  .detail-main-wrap {
    border-right: none;
  }

  .detail-toc {
    width: 100%;
    max-height: none;
    position: relative;
    border-top: 1px solid var(--detail-border);
  }
}