/* 文章详情页：正文可读性、目录、阅读进度与相关文章 */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: 100%;
  height: 3px;
  background: #2467e8;
  transform: scaleX(0);
  transform-origin: 0 50%;
}

@supports (animation-timeline: scroll()) {
  .reading-progress {
    animation: reading-progress-grow linear both;
    animation-timeline: scroll(root block);
  }
}

@keyframes reading-progress-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.article-shell {
  padding: 56px 0 88px;
}

.article-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: #6b7b98;
  font-size: 11px;
}

.article-crumb a {
  color: #314365;
}

.article-crumb a:hover {
  color: #1748bb;
}

.article-header {
  max-width: 920px;
  padding-bottom: 30px;
  border-bottom: 1px solid #dce6f4;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  color: #6b7b98;
  font-size: 12px;
}

.article-category {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 4px;
  color: #1748bb;
  background: #edf3ff;
  font-size: 12px;
  font-weight: 700;
}

.article-header h1 {
  margin: 0;
  color: #142448;
  font-size: 40px;
  line-height: 1.3;
  font-weight: 780;
  letter-spacing: -.01em;
}

.article-summary {
  max-width: 46em;
  margin: 18px 0 0;
  color: #52617c;
  font-size: 16px;
  line-height: 1.85;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 18px;
  color: #6b7b98;
  font-size: 13px;
}

.article-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.article-copy {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid #cddbf0;
  border-radius: 5px;
  color: #213554;
  background: #fff;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
}

.article-copy:hover {
  border-color: #9dbce8;
  color: #1748bb;
}

.article-copy-status {
  color: #278d84;
  font-size: 12px;
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  margin-top: 40px;
}

.article-aside {
  position: sticky;
  top: 104px;
}

.article-toc {
  padding: 18px 20px;
  border: 1px solid #dce6f4;
  border-radius: 8px;
  background: #fff;
}

.article-toc-title {
  margin: 0 0 10px;
  color: #2467e8;
  font-size: 12px;
  font-weight: 750;
}

.article-toc ol {
  margin: 0;
  padding-left: 18px;
  color: #52617c;
  font-size: 13px;
  line-height: 1.9;
}

.article-toc a:hover {
  color: #1748bb;
  text-decoration: underline;
}

.article-body {
  max-width: 68ch;
  color: #1f2f47;
  font-size: 17px;
  line-height: 1.85;
}

.article-body p {
  margin: 0 0 1.15em;
}

.article-body h2 {
  margin: 2em 0 .7em;
  color: #142448;
  font-size: 26px;
  line-height: 1.4;
  font-weight: 750;
  scroll-margin-top: 104px;
}

.article-body h3 {
  margin: 1.6em 0 .55em;
  color: #142448;
  font-size: 19px;
  line-height: 1.5;
  font-weight: 720;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.2em;
  padding-left: 1.5em;
}

.article-body li {
  margin-bottom: .55em;
}

.article-body a {
  color: #1748bb;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: #0f3a99;
}

.article-body code {
  padding: 2px 6px;
  border-radius: 4px;
  background: #eef3fb;
  font-size: .92em;
}

.article-body blockquote {
  margin: 1.4em 0;
  padding: 12px 18px;
  border-left: 3px solid #28b9b4;
  color: #40536f;
  background: #f4f9fb;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid #e6edf6;
}

.article-tags span {
  padding: 4px 10px;
  border: 1px solid #dce6f4;
  border-radius: 14px;
  color: #52617c;
  background: #fff;
  font-size: 12px;
}

.article-siblings {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.article-sibling {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid #dce6f4;
  border-radius: 8px;
  background: #fff;
}

.article-sibling:hover,
.article-related-card:hover {
  border-color: #b9cfee;
  box-shadow: 0 14px 30px rgb(33 72 135 / 7%);
}

.article-sibling small {
  color: #6b7b98;
  font-size: 11px;
}

.article-sibling strong {
  color: #1f2f47;
  font-size: 14px;
  line-height: 1.6;
}

.article-sibling.is-next {
  text-align: right;
}

.article-related {
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid #e6edf6;
}

.article-related-title {
  margin: 0 0 16px;
  color: #142448;
  font-size: 18px;
  font-weight: 720;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.article-related-card {
  display: grid;
  gap: 8px;
  padding: 18px;
  border: 1px solid #dce6f4;
  border-radius: 8px;
  background: #fff;
}

.article-related-card strong {
  color: #1f2f47;
  font-size: 15px;
  line-height: 1.6;
}

.article-related-meta {
  color: #6b7b98;
  font-size: 12px;
}

.article-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid #e6edf6;
  font-size: 13px;
}

.article-back {
  color: #314365;
  font-weight: 650;
}

.article-service {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 5px;
  color: #fff;
  background: #2467e8;
  font-weight: 700;
}

.article-service:hover {
  background: #1748bb;
}

@media (max-width: 960px) {
  .article-layout { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .article-aside { position: static; order: -1; }
  .article-toc ol { columns: 2; }
  .article-header h1 { font-size: 32px; }
}

@media (max-width: 640px) {
  .article-shell { padding: 38px 0 64px; }
  .article-header h1 { font-size: 27px; }
  .article-body { font-size: 16px; }
  .article-body h2 { font-size: 22px; }
  .article-toc ol { columns: 1; }
  .article-siblings,
  .article-related-grid { grid-template-columns: minmax(0, 1fr); }
  .article-sibling.is-next { text-align: left; }
}