:root {
  --blog-size-label: 0.8125rem;
  --blog-size-small: 0.875rem;
  --blog-size-body: 1rem;
  --blog-size-list-title: clamp(1.875rem, 1.4rem + 2vw, 3rem);
  --blog-size-article-title: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
  --blog-size-lead: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  --blog-size-h2: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  --blog-size-h3: 1.25rem;
  --blog-size-card-title: 1.25rem;
  --blog-line-title: 1.32;
  --blog-line-copy: 1.8;
  --blog-crumb-opacity: 0.72;
  --blog-divider-opacity: 0.35;
  --blog-card-gap: 1.25rem;
  --blog-card-padding: 1.5rem;
  --blog-article-gap: 2rem;
  --blog-article-start: 1.5rem;
  --blog-hero-padding: 0.5rem;
  --blog-focus-offset: 3px;
}

.blog-list-page,
.article-page {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

.blog-skip {
  position: absolute;
  top: 0.75rem;
  left: var(--gutter);
  z-index: var(--z-drawer);
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-btn);
  background: var(--surface);
  color: var(--accent);
  transform: translateY(-200%);
}

.blog-skip:focus {
  transform: translateY(0);
}

.blog-index {
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.blog-list-hero {
  max-width: var(--reading);
  padding-block: 1rem 2.5rem;
}

.blog-eyebrow {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: var(--blog-size-label);
}

.blog-list-hero h1 {
  display: block;
  max-width: 100%;
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-list-title);
  font-weight: var(--weight-normal);
  line-height: var(--blog-line-title);
  letter-spacing: -0.02em;
  overflow-wrap: break-word;
}

.blog-list-intro {
  margin: 1.25rem 0 0;
  color: var(--text-muted);
  font-size: var(--blog-size-lead);
  line-height: 1.7;
}

.blog-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--bg-panel);
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blog-filter {
  min-height: 44px;
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-size-small);
  font-weight: var(--weight-medium);
  line-height: 1.4;
  cursor: pointer;
}

.blog-filter:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.blog-filter[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: var(--shadow-xs);
}

.blog-result-count {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  line-height: 1.6;
}

.blog-post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--blog-card-gap);
}

.blog-post-card,
.related-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin: 0;
  padding: var(--blog-card-padding);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  line-height: 1.6;
}

.post-meta time {
  font-variant-numeric: tabular-nums;
}

.post-meta .tag {
  max-width: 100%;
  padding: 0.2rem 0.625rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  font-weight: var(--weight-normal);
  line-height: 1.5;
  white-space: normal;
}

.blog-post-card h2,
.related-card h3 {
  display: block;
  max-width: 100%;
  margin: 0 0 0.875rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-card-title);
  font-weight: var(--weight-normal);
  line-height: 1.55;
  overflow-wrap: break-word;
}

.blog-post-card h2 a,
.related-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.blog-post-card h2 a:hover,
.related-card h3 a:hover {
  color: var(--accent);
}

.blog-post-summary {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-size-small);
  line-height: var(--blog-line-copy);
  overflow-wrap: break-word;
}

.blog-read-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--accent);
  font-size: var(--blog-size-small);
  line-height: 1.7;
  text-decoration: none;
}

.blog-read-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--bg-panel);
  color: var(--text-muted);
  line-height: var(--blog-line-copy);
}

.blog-empty a {
  color: var(--accent);
}

/* 文章入口使用紧凑节奏，不继承首页的大区块留白。 */
.article-page main,
main.article-page {
  padding-top: var(--blog-article-start);
  padding-bottom: 3rem;
}

.article-page main > .section:first-child,
.article-page > .section:first-child,
.section:has(> .blog-breadcrumb),
.section:has(> nav.breadcrumb),
.section:has(> nav.breadcrumbs) {
  padding-top: var(--blog-article-start);
  padding-bottom: 0;
}

.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  max-width: 100%;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  padding: 0;
  overflow: hidden;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-size-label);
  font-weight: var(--weight-normal);
  line-height: 1.6;
  white-space: nowrap;
}

.blog-breadcrumb a,
nav.breadcrumb a,
nav.breadcrumbs a {
  flex: 0 0 auto;
  color: var(--text-muted);
  text-decoration: none;
  opacity: var(--blog-crumb-opacity);
}

.blog-breadcrumb a:hover,
nav.breadcrumb a:hover,
nav.breadcrumbs a:hover {
  color: var(--accent);
  opacity: 1;
}

.blog-breadcrumb [aria-hidden="true"],
nav.breadcrumb [aria-hidden="true"],
nav.breadcrumbs [aria-hidden="true"] {
  flex: 0 0 auto;
  color: var(--text-muted);
  opacity: var(--blog-divider-opacity);
}

.blog-breadcrumb [aria-current="page"],
nav.breadcrumb [aria-current="page"],
nav.breadcrumbs [aria-current="page"] {
  flex: 0 1 auto;
  min-width: 0;
  max-width: 30ch;
  overflow: hidden;
  color: var(--text-muted);
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 1;
}

.article-hero,
.article-hero.section {
  margin-block: 0 1.75rem;
  padding-block: var(--blog-hero-padding) 0;
}

.article-hero .post-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  line-height: 1.6;
}

.article-hero h1 {
  display: block;
  width: 100%;
  max-width: 100%;
  margin-block: 0.875rem 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-article-title);
  font-weight: var(--weight-normal);
  line-height: var(--blog-line-title);
  letter-spacing: -0.02em;
  overflow-wrap: break-word;
}

.article-hero .article-lead,
.article-hero .article-summary,
.article-hero .lead,
.article-hero > p:last-child {
  margin-top: 1rem;
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: var(--blog-size-lead);
  line-height: 1.7;
}

main.reading:has(> article) {
  padding-top: var(--blog-article-start);
  padding-bottom: 3rem;
}

main.reading:has(> article) > nav {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  line-height: 1.6;
}

main.reading > article > header {
  margin-block: 0 1.75rem;
  padding-block: 0;
}

main.reading > article > header .post-meta {
  margin: 0 0 0.875rem;
}

main.reading > article > header h1 {
  margin: 0 0 0.75rem;
  font-size: var(--blog-size-article-title);
  line-height: var(--blog-line-title);
  overflow-wrap: break-word;
}

main.reading > article > header > p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--blog-size-lead);
  line-height: 1.7;
}

.article-body,
.article-content,
.article-page .prose {
  min-width: 0;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-size-body);
  line-height: var(--blog-line-copy);
  overflow-wrap: break-word;
}

.article-body h2,
.article-content h2,
.article-page .prose h2 {
  display: block;
  max-width: 100%;
  margin: 2rem 0 0.875rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-h2);
  font-weight: var(--weight-normal);
  line-height: 1.45;
}

.article-body h3,
.article-content h3,
.article-page .prose h3 {
  display: block;
  margin: 1.5rem 0 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-h3);
  font-weight: var(--weight-normal);
  line-height: 1.5;
}

.article-body > h2:first-child,
.article-content > h2:first-child,
.article-page .prose > h2:first-child,
.article-body > section:first-child > h2:first-child,
.article-content > section:first-child > h2:first-child,
.article-page .prose > section:first-child > h2:first-child {
  margin-top: 0;
}

.article-body section,
.article-content section,
.article-page .prose section {
  margin-block: 1.5rem;
  padding-block: 0;
}

.article-body > section:first-child,
.article-content > section:first-child,
.article-page .prose > section:first-child {
  margin-top: 0;
}

.article-body p,
.article-content p,
.article-page .prose p {
  margin-block: 0 1rem;
}

.article-body ul,
.article-body ol,
.article-content ul,
.article-content ol,
.article-page .prose ul,
.article-page .prose ol {
  margin-block: 0.875rem 1.25rem;
  padding-inline-start: 1.5rem;
}

.article-body li + li,
.article-content li + li,
.article-page .prose li + li {
  margin-top: 0.5rem;
}

.article-body a:not([class*="btn"]):not([class*="button"]),
.article-content a:not([class*="btn"]):not([class*="button"]),
.prose a:not([class*="btn"]):not([class*="button"]) {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.article-body code,
.article-content code,
.article-page .prose code {
  border-radius: var(--r-field);
  background: var(--bg-panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.875em;
  overflow-wrap: anywhere;
}

.article-body :not(pre) > code,
.article-content :not(pre) > code,
.article-page .prose :not(pre) > code {
  padding: 0.15em 0.35em;
}

.article-body pre,
.article-content pre,
.article-page .prose pre {
  max-width: 100%;
  margin-block: 1.25rem;
  padding: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--bg-panel);
  color: var(--text);
  font-family: var(--font-mono);
  line-height: 1.7;
  white-space: pre;
  overflow-wrap: normal;
}

.article-body pre code,
.article-content pre code,
.article-page .prose pre code {
  padding: 0;
  border: 0;
  background: var(--clear);
  font-size: var(--blog-size-small);
  white-space: pre;
  overflow-wrap: normal;
}

.article-body blockquote,
.article-content blockquote,
.article-page .prose blockquote {
  margin: 1.25rem 0;
  padding: 0.875rem 1.25rem;
  border-inline-start: 3px solid var(--border-strong);
  border-radius: var(--r-field);
  background: var(--bg-panel);
  color: var(--text-muted);
}

.article-body blockquote > :last-child,
.article-content blockquote > :last-child,
.article-page .prose blockquote > :last-child {
  margin-bottom: 0;
}

.article-body .table-scroll,
.article-content .table-scroll,
.article-page .prose .table-scroll {
  max-width: 100%;
  margin-block: 1.25rem;
  overflow-x: auto;
}

.article-body table,
.article-content table,
.article-page .prose table {
  display: block;
  width: 100%;
  max-width: 100%;
  margin-block: 1.25rem;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: var(--blog-size-small);
}

.article-body th,
.article-body td,
.article-content th,
.article-content td,
.article-page .prose th,
.article-page .prose td {
  min-width: 7em;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  color: var(--text);
  text-align: start;
  vertical-align: top;
  word-break: normal;
  overflow-wrap: normal;
}

.article-body th,
.article-content th,
.article-page .prose th {
  background: var(--bg-panel);
  font-weight: var(--weight-medium);
}

.article-body img,
.article-content img,
.article-page .prose img {
  max-width: 100%;
  height: auto;
}

.article-download {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-block: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--bg-panel);
  color: var(--text);
}

.article-download > div {
  min-width: 0;
}

.article-download h2,
.article-body .article-download h2,
.article-content .article-download h2,
.article-page .prose .article-download h2 {
  display: block;
  margin: 0 0 0.625rem;
  font-size: var(--blog-size-h2);
}

.article-download p,
.article-body .article-download p,
.article-content .article-download p,
.article-page .prose .article-download p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--blog-size-small);
  line-height: 1.7;
}

.article-download .card-actions,
.article-download .article-download-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
}

#related-posts {
  margin-block: var(--blog-article-gap);
  padding-block: 0;
}

#related-posts > h2 {
  display: block;
  margin: 0 0 1.25rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-size-h2);
  font-weight: var(--weight-normal);
  line-height: 1.45;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: var(--blog-card-gap);
}

.reading .related-grid,
.article-body .related-grid,
.article-content .related-grid,
.article-page .prose .related-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

#related-posts .related-card h3 {
  margin: 0 0 0.875rem;
  font-size: var(--blog-size-card-title);
}

#related-posts .blog-post-summary {
  margin: 0 0 1.25rem;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--blog-card-gap);
  margin-block: var(--blog-article-gap);
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--border);
}

#post-nav .post-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow-xs);
}

.post-nav-next {
  grid-column: 2;
}

#post-nav .post-nav-card:hover {
  border-color: var(--accent);
}

.post-nav-label,
.post-nav-date {
  color: var(--text-muted);
  font-size: var(--blog-size-label);
  line-height: 1.6;
}

.post-nav-title {
  color: var(--text);
  font-size: var(--blog-size-body);
  line-height: 1.65;
  overflow-wrap: break-word;
}

.post-nav-card:hover .post-nav-title {
  color: var(--accent);
}

.post-nav-date {
  margin-top: auto;
  font-variant-numeric: tabular-nums;
}

.blog-filter:focus-visible,
.blog-skip:focus-visible,
.blog-post-card a:focus-visible,
.related-card a:focus-visible,
#post-nav a:focus-visible,
.blog-breadcrumb a:focus-visible,
nav.breadcrumb a:focus-visible,
nav.breadcrumbs a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: var(--blog-focus-offset);
  box-shadow: var(--focus-ring);
}

#related-posts[hidden],
#post-nav[hidden] {
  display: none;
}

@media (max-width: 1000px) {
  .blog-post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .blog-index {
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
  }

  .blog-list-hero {
    padding-block: 0.5rem 1.75rem;
  }

  .blog-list-hero h1 {
    font-size: 1.875rem;
  }

  .article-hero h1 {
    font-size: 1.5rem;
  }

  .blog-filter-bar {
    align-items: flex-start;
    padding: 0.875rem;
  }

  .blog-post-grid,
  .related-grid,
  #post-nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav-next {
    grid-column: auto;
  }

  .blog-post-card,
  .related-card,
  .article-download {
    padding: 1.25rem;
  }

  .article-download {
    align-items: flex-start;
  }
}