:root {
  --blog-list-title: clamp(1.75rem, 1.1rem + 2.2vw, 3rem);
  --blog-article-title: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
  --blog-lead-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  --blog-h2-size: 1.5rem;
  --blog-h3-size: 1.25rem;
  --blog-meta-size: 0.8125rem;
  --blog-card-title: 1.1875rem;
  --blog-body-size: 1rem;
  --blog-modal-width: 30rem;
  --blog-modal-close-size: 1.75rem;
  --blog-focus-width: 3px;
}

main.wrap.reading:has(> article),
.article-page > main.wrap,
.blog-article-page > main.wrap,
.article-page > main.section,
.blog-article-page > main.section {
  padding-top: 24px;
}
.article-page > main > nav.breadcrumb,
.article-page > main > nav.breadcrumbs,
.blog-article-page > main > nav.breadcrumb,
.blog-article-page > main > nav.breadcrumbs {
  margin-top: 0;
}
main.reading > nav:first-child {
  margin-top: 0;
  margin-bottom: 20px;
}
main.reading > nav:first-child > p {
  margin: 0;
}
main.reading > article > header > .post-meta,
.article-page article > header > .post-meta {
  margin-bottom: 14px;
}
main.reading > article > header > h1,
.article-page article > header > h1 {
  margin: 0 0 12px;
  font-size: var(--blog-article-title);
  line-height: 1.32;
}
main.reading > article > header > p,
.article-page article > header > p {
  margin-top: 18px;
}

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

.blog-skip {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 1rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text);
  transform: translateY(-200%);
}

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

.blog-list-hero {
  padding-block: 3rem;
  background: var(--accent-dark);
  color: var(--on-dark);
}

.blog-list-hero .eyebrow {
  color: var(--accent-dark);
}

.blog-list-hero h1 {
  display: block;
  margin: 0.875rem 0 1rem;
  max-width: 100%;
  font-family: var(--font-display);
  font-size: var(--blog-list-title);
  font-weight: var(--weight-display);
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.blog-list-hero p {
  margin: 0;
  max-width: 48rem;
  color: var(--on-dark-muted);
  font-size: var(--blog-lead-size);
  line-height: 1.7;
}

.blog-list-content {
  padding-block: 2.5rem 4rem;
}

.blog-list-content h2 {
  display: block;
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--weight-display);
}

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

.blog-filter {
  min-height: 2.75rem;
  padding: 0.625rem 1.125rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: var(--weight-semibold);
  line-height: 1.4;
  cursor: pointer;
  transition: background var(--motion-time) var(--motion-ease),
    border-color var(--motion-time) var(--motion-ease);
}

.blog-filter:hover {
  background: var(--bg-panel2);
  border-color: var(--accent-dark);
}

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

.blog-filter:focus-visible,
.blog-download-modal-close:focus-visible,
.post-card a:focus-visible,
.post-nav-card:focus-visible,
.blog-skip:focus-visible {
  outline: var(--blog-focus-width) solid var(--accent-dark);
  outline-offset: 4px;
}

.blog-result-status {
  margin: 1.25rem 0;
  color: var(--text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

.blog-post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 1.25rem;
}

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

.blog-post-grid .post-card,
#related-posts .post-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg);
  color: var(--text);
  box-shadow: none;
}

.post-card .post-meta,
.article-hero .post-meta,
.article-hero .article-meta,
.article-header .post-meta,
.article-header .article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem 0.875rem;
  color: var(--text-muted);
  font-size: var(--blog-meta-size);
  line-height: 1.6;
}

.post-card .post-meta {
  margin: 0 0 1rem;
}

.post-meta time,
.article-meta time {
  font-family: var(--font-mono);
  font-size: var(--blog-meta-size);
}

.post-card .tag {
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--accent-dark);
  font-size: var(--blog-meta-size);
  line-height: 1.5;
  white-space: normal;
}

.post-card h3 {
  display: block;
  margin: 0 0 0.875rem;
  font-family: var(--font-display);
  font-size: var(--blog-card-title);
  font-weight: var(--weight-display);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

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

.post-card h3 a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.post-card > p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: var(--fs-small);
  line-height: 1.85;
  overflow-wrap: anywhere;
}

.post-card .post-more {
  align-self: flex-start;
  margin-top: auto;
  color: var(--accent-dark);
  font-size: var(--fs-small);
  font-weight: var(--weight-bold);
  line-height: 1.6;
  text-decoration: none;
}

.post-card .post-more:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg);
  color: var(--text-muted);
}

/* 面包屑别名共用同一套单行路标样式。 */
.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  padding-block: 0;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-meta-size);
  line-height: 1.6;
  white-space: nowrap;
  overflow: hidden;
}

.blog-breadcrumb a,
nav.breadcrumb a,
nav.breadcrumbs a {
  flex: 0 0 auto;
  color: var(--text-muted);
  opacity: 0.65;
  text-decoration: none;
}

.blog-breadcrumb a:hover,
nav.breadcrumb a:hover,
nav.breadcrumbs a:hover {
  color: var(--accent-dark);
  opacity: 1;
  text-decoration: none;
}

.blog-breadcrumb [aria-hidden="true"],
nav.breadcrumb [aria-hidden="true"],
nav.breadcrumbs [aria-hidden="true"],
.blog-breadcrumb .separator,
nav.breadcrumb .separator,
nav.breadcrumbs .separator {
  flex: 0 0 auto;
  color: var(--text-muted);
  opacity: 0.35;
}

.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;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section:has(> .blog-breadcrumb),
.section:has(> nav.breadcrumb),
.section:has(> nav.breadcrumbs),
.section:has(> .wrap > .blog-breadcrumb),
.section:has(> .wrap > nav.breadcrumb),
.section:has(> .wrap > nav.breadcrumbs) {
  padding-block: 0;
}

.article-page > main.section,
.blog-article-page > main.section,
main.section:has(.article-hero),
main.section:has(.article-header) {
  padding-top: 24px;
  padding-bottom: 2.5rem;
}

.article-hero,
.article-header {
  padding-block: 0.5rem 1.5rem;
  background: var(--bg);
  color: var(--text);
}

.article-hero .post-meta,
.article-hero .article-meta,
.article-header .post-meta,
.article-header .article-meta {
  margin-block: 0 1rem;
}

.article-hero h1,
.article-header h1,
.article-page .article-title,
.blog-article-page .article-title {
  display: block;
  max-width: 100%;
  margin-block: 0.875rem 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-article-title);
  font-weight: var(--weight-display);
  line-height: 1.32;
  overflow-wrap: anywhere;
}

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

.article-body,
.article-page .prose,
.blog-article-page .prose {
  min-width: 0;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  line-height: 1.85;
  overflow-wrap: anywhere;
}

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

.article-body h2,
.article-page .prose h2,
.blog-article-page .prose h2 {
  display: block;
  margin-block: 2rem 0.875rem;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--weight-display);
  line-height: 1.45;
}

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

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

.article-body p,
.article-body ul,
.article-body ol,
.article-body pre,
.article-body blockquote {
  margin-block: 0 1.25rem;
}

.article-body ul,
.article-body ol {
  padding-inline-start: 1.5rem;
}

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

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

.article-body code {
  padding: 0.125rem 0.3rem;
  border-radius: var(--r-sm);
  background: var(--bg-panel2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  overflow-wrap: anywhere;
}

.article-body pre {
  max-width: 100%;
  padding: 1.125rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel2);
  color: var(--text);
  line-height: 1.7;
  overflow-x: auto;
}

.article-body pre code {
  padding: 0;
  background: var(--clear);
  color: inherit;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}

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

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

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

.article-body table,
.prose table {
  display: block;
  max-width: 100%;
  margin-block: 1.25rem;
  border-collapse: collapse;
  overflow-x: auto;
}

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

.article-body th,
.prose th {
  background: var(--bg-panel2);
  color: var(--text);
  font-weight: var(--weight-bold);
}

.dl-card {
  display: block;
  margin-block: 2rem 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-panel);
  color: var(--text);
}

.dl-card h2,
.article-body .dl-card h2 {
  display: block;
  margin-block: 0 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--weight-display);
  line-height: 1.45;
}

.dl-card p {
  margin-block: 0 1rem;
  color: var(--text-muted);
}

.dl-card .cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#related-posts {
  margin-block: 2rem 1.5rem;
  padding-block: 0;
}

#related-posts > h2 {
  display: block;
  margin-block: 0 1rem;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--weight-display);
  line-height: 1.45;
}

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

/* 阅读版心至多两列，窄屏不把卡片压成文字塔。 */
.wrap.reading .related-post-grid,
.reading .related-post-grid,
.article-body .related-post-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-block: 1.5rem 2.5rem;
  padding-block: 0;
}

#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-md);
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
}

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

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

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

.post-nav-card time {
  margin-top: auto;
  font-family: var(--font-mono);
}

.post-nav-card strong {
  font-size: var(--blog-body-size);
  font-weight: var(--weight-bold);
  line-height: 1.65;
  overflow-wrap: anywhere;
}

body.blog-modal-open {
  overflow: hidden;
}

.blog-download-modal {
  position: fixed;
  inset: 0;
  width: min(var(--blog-modal-width), calc(100% - 2rem));
  max-width: var(--blog-modal-width);
  max-height: calc(100dvh - 2rem);
  margin: auto;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  overflow-y: auto;
  opacity: 0;
  transform: translateY(0.5rem);
  transition: opacity var(--motion-time) var(--motion-ease),
    transform var(--motion-time) var(--motion-ease);
}

.blog-download-modal::backdrop {
  background: var(--veil);
  opacity: 0;
  transition: opacity var(--motion-time) var(--motion-ease);
}

.blog-download-modal.is-visible,
.blog-download-modal.is-visible::backdrop {
  opacity: 1;
}

.blog-download-modal.is-visible {
  transform: translateY(0);
}

.blog-download-modal-panel {
  position: relative;
  padding: 2rem;
}

.blog-download-modal-close {
  position: absolute;
  top: 0.625rem;
  right: 0.625rem;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--r-circle);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-modal-close-size);
  line-height: 1;
  cursor: pointer;
}

.blog-download-modal-close:hover {
  background: var(--bg-panel);
}

.blog-download-modal-brand {
  margin: 0 2.5rem 0.875rem 0;
  color: var(--text-muted);
  font-size: var(--fs-small);
  font-weight: var(--weight-semibold);
  line-height: 1.6;
}

.blog-download-modal h2 {
  display: block;
  margin: 0 0 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--weight-display);
  line-height: 1.4;
}

#blog-download-modal-description {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: 1.8;
}

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

@media (min-width: 821px) {
  .related-post-grid {
    grid-template-columns: repeat(2, minmax(300px, 1fr));
  }
}

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

@media (max-width: 640px) {
  .blog-list-hero {
    padding-block: 2rem;
  }

  .blog-list-hero h1 {
    font-size: min(var(--blog-list-title), 1.875rem);
  }

  .blog-list-content {
    padding-block: 2rem 2.5rem;
  }

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

  .post-nav-next {
    grid-column: 1;
  }

  .blog-post-grid .post-card,
  #related-posts .post-card,
  .dl-card {
    padding: 1.25rem;
  }

  .article-hero h1,
  .article-header h1,
  .article-page .article-title,
  .blog-article-page .article-title {
    font-size: 1.5rem;
  }

  .article-hero,
  .article-header {
    padding-block: 0.25rem 1.25rem;
  }

  .blog-download-modal-panel {
    padding: 1.5rem;
  }

  .blog-download-modal-brand {
    margin-right: 2.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filter,
  .blog-download-modal,
  .blog-download-modal::backdrop {
    transition: none;
  }

  .blog-download-modal,
  .blog-download-modal.is-visible {
    transform: none;
  }
}