.blog-hero {
  padding-top: 56px;
  padding-bottom: 32px;
  background: var(--paper);
  border-bottom: 1px solid var(--hairline);
}

.blog-hero h1 {
  margin-top: .5rem;
  margin-bottom: .6rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  color: var(--ink);
}

.blog-hero p {
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.tag-filter button {
  padding: 8px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline);
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-copy);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}

.tag-filter button:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.tag-filter button.on {
  background: var(--blueprint);
  border-color: var(--blueprint);
  color: #ffffff;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

@media (max-width: 760px) {
  .post-grid {
    grid-template-columns: 1fr;
  }
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  box-shadow: var(--lift);
  min-width: 0;
  transition: border-color .15s ease, box-shadow .15s ease;
}

.post-card:hover {
  border-color: var(--blueprint);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.post-date {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--ink-soft);
  flex-shrink: 0;
}

.post-tag {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--blueprint-wash);
  color: var(--blueprint-deep);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.post-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
}

.post-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.post-card h3 a:hover {
  color: var(--blueprint);
}

.post-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.75;
  flex: 1;
}

.post-link {
  align-self: flex-start;
  color: var(--blueprint);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.post-link:hover {
  color: var(--blueprint-deep);
}

.post-empty {
  color: var(--ink-soft);
  font-size: 15px;
  padding: 40px 0;
  text-align: center;
  grid-column: 1 / -1;
}

/* 面包屑 */
.crumbs {
  margin-top: 1.4rem;
  padding-top: .2rem;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.crumbs a {
  color: var(--ink-soft);
  text-decoration: none;
}

.crumbs a:hover {
  color: var(--blueprint);
}

.crumb-sep {
  color: var(--hairline);
  flex-shrink: 0;
}

/* 文章 Hero */
.article-hero {
  padding-top: 20px;
  padding-bottom: 32px;
}

.article-hero .post-meta {
  margin-bottom: 14px;
}

.article-hero .read-time {
  font-size: 13px;
  color: var(--ink-soft);
}

.article-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 36px);
  color: var(--ink);
  line-height: 1.4;
  margin: 8px 0 14px;
}

.article-hero .article-summary {
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
  max-width: 700px;
}

/* 文章正文排版 */
.article-body {
  padding-top: 8px;
  padding-bottom: 40px;
}

.article-body h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 24px;
  color: var(--ink);
  margin: 40px 0 16px;
}

.article-body h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
  margin: 28px 0 12px;
}

.article-body p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 18px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 18px;
  padding-left: 22px;
  line-height: 1.75;
  color: var(--ink);
}

.article-body li {
  margin-bottom: 8px;
}

.article-body pre {
  background: var(--paper-mist);
  border: 1px solid var(--hairline);
  border-radius: var(--r-tiny);
  padding: 16px;
  overflow-x: auto;
  margin: 0 0 20px;
}

.article-body code {
  font-family: var(--font-code);
  font-size: 13.5px;
  color: var(--ink);
}

.article-body blockquote {
  margin: 0 0 20px;
  padding: 12px 18px;
  border-left: 3px solid var(--blueprint);
  background: var(--paper-mist);
  border-radius: var(--r-tiny);
  color: var(--ink-soft);
}

/* 文末下载引导卡 */
.endcta {
  padding: 40px;
  background: var(--paper-mist);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  text-align: center;
  margin: 44px 0;
}

.endcta h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 24px;
  color: var(--ink);
  margin: 0 0 10px;
}

.endcta p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 22px;
}

/* 延伸阅读 */
#related-posts {
  margin: 44px 0;
}

#related-posts h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  color: var(--ink);
  margin: 0 0 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

@media (max-width: 760px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

.related-card {
  display: block;
  padding: 18px;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  text-decoration: none;
  min-width: 0;
  transition: border-color .15s ease;
}

.related-card:hover {
  border-color: var(--blueprint);
}

.related-card .post-meta {
  margin-bottom: 10px;
}

.related-card h4 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.55;
}

/* 上/下篇 */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 44px 0;
}

@media (max-width: 640px) {
  .post-nav {
    grid-template-columns: 1fr;
  }
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  text-decoration: none;
  min-width: 0;
  transition: border-color .15s ease;
}

.post-nav-link:hover {
  border-color: var(--blueprint);
}

.post-nav-link.next {
  text-align: right;
  align-items: flex-end;
}

.post-nav-eyebrow {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--blueprint);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.post-nav-title {
  font-size: 15px;
  color: var(--ink);
  line-height: 1.55;
}