:root {
  --blog-title-size: clamp(2rem, 1.35rem + 2.2vw, 3rem);
  --blog-mobile-title-size: clamp(1.5rem, 1.15rem + 2vw, 1.875rem);
  --blog-article-title-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
  --blog-lead-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  --blog-small-size: 0.8125rem;
  --blog-body-size: 1rem;
  --blog-h2-size: 1.5rem;
  --blog-h3-size: 1.25rem;
  --blog-card-title-size: 1.1875rem;
  --blog-title-weight: 800;
  --blog-heading-weight: 700;
  --blog-body-leading: 1.85;
  --blog-separator-opacity: 0.35;
  --blog-focus-width: 3px;
  --blog-focus-offset: 4px;
  --blog-card-padding: 1.5rem;
  --blog-grid-gap: 1.25rem;
  --blog-section-gap: 2.5rem;
  --blog-reading-width: 780px;
}

.blog-main {
  padding-top: 2.75rem;
  padding-bottom: 4rem;
}

.blog-skip {
  position: absolute;
  top: 0.75rem;
  left: var(--gutter);
  z-index: 100;
  padding: 0.75rem 1rem;
  transform: translateY(-200%);
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-family: var(--font-body);
}

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

.blog-hero {
  padding-block: 1rem 2.25rem;
}

.blog-eyebrow {
  margin: 0 0 1rem;
  font-size: var(--blog-small-size);
  font-weight: var(--blog-heading-weight);
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.blog-hero h1 {
  max-width: 100%;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--blog-title-size);
  font-weight: var(--blog-title-weight);
  line-height: 1.25;
  letter-spacing: -0.035em;
  color: var(--text);
  overflow-wrap: anywhere;
}

.blog-intro {
  max-width: var(--reading);
  margin: 1rem 0 0;
  font-size: var(--blog-lead-size);
  line-height: 1.75;
  color: var(--text-muted);
}

.blog-catalog {
  padding: 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: var(--bg-panel-2);
}

.blog-catalog-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.blog-catalog-heading h2,
.blog-reference h2,
#related-posts > h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.4;
  color: var(--text);
}

.blog-result-count {
  margin: 0;
  font-size: var(--blog-small-size);
  color: var(--text-muted);
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-bottom: 1.5rem;
}

.blog-filter {
  min-height: 44px;
  padding: 0.625rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-small-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.5;
  cursor: pointer;
  transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

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

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

.blog-filter:focus-visible,
.blog-skip:focus-visible,
.article-card a:focus-visible,
.post-nav-card:focus-visible,
.blog-breadcrumb a:focus-visible,
nav.breadcrumb a:focus-visible,
nav.breadcrumbs a:focus-visible {
  outline: var(--blog-focus-width) solid var(--accent-dark);
  outline-offset: var(--blog-focus-offset);
}

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

.blog-post-grid > *,
.related-grid > * {
  min-width: 0;
}

.article-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  height: 100%;
  padding: var(--blog-card-padding);
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  overflow-wrap: anywhere;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.article-meta .chip {
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

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

.article-card h3 {
  margin: 1rem 0 0;
  font-family: var(--font-display);
  font-size: var(--blog-card-title-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.6;
}

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

.article-card h3 a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.article-card .article-summary {
  margin: 0.875rem 0 1.25rem;
  font-size: var(--blog-body-size);
  line-height: 1.8;
  color: var(--text-muted);
}

.article-card .article-read {
  align-self: flex-start;
  margin-top: auto;
  padding-block: 0.25rem;
  color: var(--text);
  font-size: var(--blog-small-size);
  font-weight: var(--blog-heading-weight);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.3em;
}

.article-card .article-read:hover {
  text-decoration-color: var(--accent-dark);
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 1.5rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.blog-empty a {
  color: var(--text);
  text-underline-offset: 0.2em;
}

.blog-reference {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
  padding: 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: var(--bg-panel);
}

.blog-reference > div {
  min-width: 0;
}

.blog-reference p {
  max-width: 40rem;
  margin: 0.75rem 0 0;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 文章页使用独立的紧凑节奏，不沿用首页分区间距。 */
.article-page main,
.blog-article main,
main.article-main,
main:has(.article-hero) {
  padding-top: 2rem;
}

.article-page main > .section,
.blog-article main > .section,
main.article-main > .section,
main:has(.article-hero) > .section,
.section:has(> .blog-breadcrumb),
.section:has(> nav.breadcrumb),
.section:has(> nav.breadcrumbs) {
  padding-top: 1.5rem;
  padding-bottom: 0;
}

.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.5rem 0 1.25rem;
  padding: 0;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-small-size);
  line-height: 1.7;
}

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

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

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

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

.article-hero,
.article-hero.section,
.article-header,
.article-header.section {
  padding-block: 0.5rem 1.75rem;
  margin: 0;
}

.article-hero .article-meta,
.article-header .article-meta {
  margin: 0 0 1rem;
  font-size: var(--blog-small-size);
}

.article-hero h1,
.article-header h1 {
  max-width: 100%;
  margin: 0.875rem 0 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-article-title-size);
  font-weight: var(--blog-title-weight);
  line-height: 1.32;
  letter-spacing: -0.025em;
  overflow-wrap: anywhere;
}

.article-hero .article-lead,
.article-hero .article-summary,
.article-hero > p,
.article-header .article-lead,
.article-header .article-summary,
.article-header > p {
  max-width: 100%;
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: var(--blog-lead-size);
  line-height: 1.7;
}

.article-body,
.article-main .prose,
.article-page .prose,
.blog-article .prose,
main:has(.article-hero) .prose {
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  overflow-wrap: anywhere;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) h2 {
  margin: 2rem 0 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.5;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) > h2:first-of-type,
:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) > section:first-child > h2:first-child {
  margin-top: 0;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) h3 {
  margin: 1.5rem 0 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h3-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.5;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) :is(p, ul, ol, blockquote, pre, .table-scroll) {
  margin-block: 0 1.25rem;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) section,
:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) section.section {
  margin-block: 0;
  padding-block: 0;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) section + section {
  margin-top: 2rem;
}

:is(.article-body, .article-main .prose, .article-page .prose, .blog-article .prose, main:has(.article-hero) .prose) section > h2:first-child {
  margin-top: 0;
}

.article-body a:not([class*="btn"]):not([class*="button"]):not(.post-nav-card),
.prose a:not([class*="btn"]):not([class*="button"]):not(.post-nav-card) {
  color: var(--text);
  text-decoration-color: var(--accent-dark);
  text-underline-offset: 0.2em;
}

.article-body a:not([class*="btn"]):not([class*="button"]):hover,
.prose a:not([class*="btn"]):not([class*="button"]):hover {
  text-decoration: underline;
}

.article-body :is(ul, ol) {
  padding-left: 1.5rem;
}

.article-body li + li {
  margin-top: 0.5rem;
}

.article-body blockquote {
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent-dark);
  border-radius: var(--r-sm);
  background: var(--bg-panel-2);
  color: var(--text);
}

.article-body blockquote > :last-child {
  margin-bottom: 0;
}

.article-body code {
  font-family: var(--font-mono);
  overflow-wrap: anywhere;
}

.article-body pre {
  max-width: 100%;
  padding: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

.article-body pre code {
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

.article-body table,
.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.article-body :is(th, td),
.prose :is(th, td) {
  min-width: 7em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-body img {
  max-width: 100%;
  height: auto;
}

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

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

.download-guide h2,
.article-body .download-guide h2,
.prose .download-guide h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  line-height: 1.4;
  color: var(--text);
}

.download-guide p,
.article-body .download-guide p,
.prose .download-guide p {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: 1.75;
}

.download-guide .cta-row {
  margin: 0;
}

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

#related-posts > h2 {
  margin-bottom: 1.25rem;
}

#related-posts .article-card h3 {
  font-size: var(--blog-card-title-size);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--blog-grid-gap);
  margin-block: 2rem 3rem;
  padding-block: 0;
}

.post-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  overflow-wrap: anywhere;
  transition: border-color var(--fast) var(--ease);
}

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

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

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

.post-nav-title {
  color: var(--text);
  font-size: var(--blog-body-size);
  font-weight: var(--blog-heading-weight);
  line-height: 1.7;
}

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

@media (max-width: 680px) {
  .blog-main {
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
  }

  .blog-hero {
    padding-block: 0.75rem 1.75rem;
  }

  .blog-hero h1 {
    font-size: var(--blog-mobile-title-size);
    line-height: 1.35;
  }

  .blog-catalog {
    padding: 1.125rem;
  }

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

  .article-card {
    padding: 1.25rem;
  }

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

  .blog-reference,
  .download-guide {
    padding: 1.25rem;
  }

  .blog-reference .cta-row,
  .download-guide .cta-row {
    width: 100%;
    flex-wrap: wrap;
  }

  .article-hero,
  .article-header {
    padding-bottom: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filter,
  .post-nav-card {
    transition: none;
  }
}