:root {
  --blog-filter-background: var(--color-page);
  --blog-filter-active-background: var(--color-panel-strong);
  --blog-card-background: var(--color-page);
  --blog-code-background: var(--color-panel);
  --blog-meta-size: 0.8125rem;
  --blog-card-min-width: 18.75rem;
  --blog-reading-gap: 1.5rem;
}

.blog-index main,
.blog-article main {
  overflow-x: clip;
}

.blog-list-hero {
  position: relative;
  padding-top: clamp(3.5rem, 7vw, 6rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.blog-list-hero::after {
  position: absolute;
  z-index: -1;
  top: -8rem;
  right: -12rem;
  width: min(38rem, 75vw);
  aspect-ratio: 1;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle, color-mix(in srgb, var(--color-brand) 18%, transparent), transparent 68%);
  content: "";
  pointer-events: none;
}

.blog-eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-brand-deep);
  font-family: var(--font-body);
  font-size: var(--blog-meta-size);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.blog-eyebrow {
  margin-bottom: 1rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-page);
}

.blog-list-hero h1 {
  max-width: 100%;
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(2rem, 2.8vw + 1rem, 3rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.blog-list-hero p {
  max-width: 43rem;
  margin-top: 1.25rem;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.75;
}

.blog-catalog {
  padding-top: 0;
  padding-bottom: var(--section-space);
}

.blog-catalog-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.blog-catalog-heading h2 {
  margin-top: 0.55rem;
  margin-bottom: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 1.35rem + 1vw, 2.25rem);
  line-height: 1.25;
}

.blog-result-count {
  flex: 0 0 auto;
  margin: 0;
  color: var(--color-muted);
  font-size: var(--blog-meta-size);
}

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.blog-filter-button {
  min-height: 2.5rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--blog-filter-background);
  color: var(--color-muted);
  font: 600 0.875rem/1 var(--font-body);
  cursor: pointer;
  transition:
    color 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease;
}

.blog-filter-button:hover {
  border-color: var(--color-brand);
  color: var(--color-brand-deep);
  transform: translateY(-1px);
}

.blog-filter-button.is-active {
  border-color: var(--color-brand);
  background: var(--blog-filter-active-background);
  color: var(--color-brand-deep);
}

.blog-filter-button:focus-visible,
.article-card-link:focus-visible,
.related-card-link:focus-visible,
.post-nav-link:focus-visible,
.blog-breadcrumb a:focus-visible,
nav.breadcrumb a:focus-visible,
nav.breadcrumbs a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-brand) 36%, transparent);
  outline-offset: 3px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.article-card,
.related-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--blog-card-background);
  box-shadow: var(--shadow-card);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.article-card {
  min-height: 20rem;
  padding: clamp(1.35rem, 2.5vw, 2rem);
}

.article-card:hover,
.related-card:hover {
  border-color: color-mix(in srgb, var(--color-brand) 42%, var(--color-line));
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.article-card-meta,
.related-card-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  color: var(--color-muted);
  font-size: var(--blog-meta-size);
  line-height: 1.4;
}

.badge,
.article-meta .tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid color-mix(in srgb, var(--color-brand) 38%, var(--color-line));
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-brand-deep);
  font-size: var(--blog-meta-size);
  font-weight: 700;
}

.article-card h3,
.related-card h3 {
  margin-top: 1.15rem;
  margin-bottom: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 750;
}

.article-card h3 {
  font-size: clamp(1.2rem, 1.08rem + 0.45vw, 1.5rem);
  line-height: 1.42;
}

.article-card p {
  margin-top: 0.9rem;
  margin-bottom: 1.5rem;
  color: var(--color-muted);
  line-height: 1.75;
}

.article-card-link,
.related-card-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--color-brand-deep);
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.article-card-link::after,
.related-card-link::after {
  display: inline-block;
  margin-left: 0.35rem;
  content: "→";
  transition: transform 160ms ease;
}

.article-card-link:hover::after,
.related-card-link:hover::after {
  transform: translateX(3px);
}

.blog-empty {
  padding: 2.5rem;
  border: 1px dashed var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-muted);
  text-align: center;
}

/* 文章页紧凑页头与面包屑 */
.article-shell,
.article-page {
  padding-top: 1.5rem;
  padding-bottom: 4rem;
}

.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  overflow: hidden;
  color: var(--color-muted);
  font-size: var(--blog-meta-size);
  line-height: 1.5;
  white-space: nowrap;
}

.blog-breadcrumb a,
nav.breadcrumb a,
nav.breadcrumbs a {
  flex: 0 0 auto;
  color: color-mix(in srgb, var(--color-muted) 60%, transparent);
  text-decoration: none;
  transition: color 160ms ease;
}

.blog-breadcrumb a:hover,
nav.breadcrumb a:hover,
nav.breadcrumbs a:hover {
  color: var(--color-brand-deep);
}

.blog-breadcrumb .separator,
nav.breadcrumb .separator,
nav.breadcrumbs .separator {
  flex: 0 0 auto;
  color: color-mix(in srgb, var(--color-muted) 35%, transparent);
}

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

.article-hero {
  padding-top: 0.75rem;
  padding-bottom: 2rem;
}

.article-hero .article-meta {
  margin-bottom: 0.875rem;
}

.article-hero h1 {
  max-width: 100%;
  margin-block: 0.875rem 0.75rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.025em;
}

.article-lead,
.article-hero > p {
  max-width: var(--reading-width);
  margin-top: 0.75rem;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  line-height: 1.7;
}

.reading-wrap {
  width: min(100%, var(--reading-width));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  color: var(--color-ink);
  font-size: 1rem;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

.prose > h2:first-of-type,
.prose > section:first-of-type > h2:first-child {
  margin-top: 0;
}

.prose h2 {
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.16rem + 0.55vw, 1.5rem);
  font-weight: 760;
  line-height: 1.4;
}

.prose h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.04rem + 0.3vw, 1.25rem);
  font-weight: 730;
  line-height: 1.45;
}

.prose p {
  margin-top: 0;
  margin-bottom: 1.15rem;
}

.prose ul,
.prose ol {
  margin-top: 0.75rem;
  margin-bottom: 1.35rem;
  padding-left: 1.45rem;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose a:not([class*="btn"]):not([class*="button"]) {
  color: var(--color-brand-deep);
  text-decoration-color: color-mix(in srgb, var(--color-brand) 45%, transparent);
  text-underline-offset: 0.2em;
}

.prose a:not([class*="btn"]):not([class*="button"]):hover {
  text-decoration-color: currentColor;
}

.prose code {
  padding: 0.12em 0.35em;
  border-radius: var(--radius-sm);
  background: var(--blog-code-background);
  color: var(--color-brand-deep);
  font-family: var(--font-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.prose pre {
  margin-top: 1.35rem;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--blog-code-background);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
}

.prose pre code {
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
  overflow-wrap: normal;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--color-brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--color-panel);
  color: var(--color-muted);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose > section {
  padding-top: 0;
  padding-bottom: 0;
}

.prose > section + section {
  margin-top: 2.75rem;
}

.prose > section + section > h2:first-child {
  margin-top: 0;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.callout {
  margin: 1.5rem 0;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.callout strong {
  color: var(--color-ink);
}

.callout p {
  margin-top: 0.45rem;
  margin-bottom: 0;
}

.callout-success {
  border-color: color-mix(in srgb, var(--color-success) 42%, var(--color-line));
}

.callout-warning {
  border-color: color-mix(in srgb, var(--color-warning) 48%, var(--color-line));
}

.callout-error {
  border-color: color-mix(in srgb, var(--color-error) 42%, var(--color-line));
}

.end-download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3rem;
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.end-download-card h2 {
  margin: 0;
  color: var(--color-ink);
  font-size: clamp(1.25rem, 1.1rem + 0.55vw, 1.5rem);
  line-height: 1.4;
}

.end-download-card p {
  margin-top: 0.55rem;
  margin-bottom: 0;
  color: var(--color-muted);
}

.end-download-card .button-row {
  flex: 0 0 auto;
}

#related-posts {
  width: min(100%, var(--reading-width));
  margin: 3rem auto 0;
  padding-inline: var(--gutter);
}

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

#related-posts > h2 {
  margin-top: 0;
  margin-bottom: 1.25rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.16rem + 0.55vw, 1.5rem);
  line-height: 1.4;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(var(--blog-card-min-width), 1fr));
  gap: 1rem;
}

.related-card {
  min-width: var(--blog-card-min-width);
  padding: 1.25rem;
}

.related-card h3 {
  font-size: 1.05rem;
  line-height: 1.5;
}

.related-card p {
  display: -webkit-box;
  margin-top: 0.75rem;
  margin-bottom: 1.1rem;
  overflow: hidden;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

#post-nav {
  display: grid;
  width: min(100%, var(--reading-width));
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem auto 0;
  padding-inline: var(--gutter);
}

#post-nav.has-single-link {
  grid-template-columns: minmax(0, 1fr);
}

.post-nav-link {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
  color: var(--color-ink);
  text-decoration: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.post-nav-link:hover {
  border-color: color-mix(in srgb, var(--color-brand) 42%, var(--color-line));
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.post-nav-label {
  color: var(--color-brand-deep);
  font-size: var(--blog-meta-size);
  font-weight: 750;
}

.post-nav-link strong {
  overflow: hidden;
  font-size: 0.95rem;
  line-height: 1.55;
  text-overflow: ellipsis;
}

.post-nav-next {
  text-align: right;
}

@media (max-width: 820px) {
  .article-grid {
    grid-template-columns: 1fr;
  }

  .related-grid {
    grid-template-columns: minmax(var(--blog-card-min-width), 1fr);
  }

  .end-download-card {
    align-items: flex-start;
    flex-direction: column;
  }

  .end-download-card .button-row {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .blog-list-hero {
    padding-top: 3rem;
    padding-bottom: 2.75rem;
  }

  .blog-list-hero h1 {
    font-size: clamp(1.75rem, 7vw, 1.875rem);
  }

  .blog-catalog-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.65rem;
  }

  .blog-filter {
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }

  .blog-filter-button {
    padding-inline: 0.8rem;
  }

  .article-card {
    min-height: 0;
    padding: 1.25rem;
  }

  .article-shell,
  .article-page {
    padding-top: 1.25rem;
  }

  .article-hero {
    padding-top: 0.5rem;
  }

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

  .reading-wrap,
  #related-posts,
  #post-nav {
    padding-inline: var(--gutter);
  }

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

  .related-card {
    min-width: 0;
  }

  #post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav-next {
    text-align: left;
  }

  .end-download-card .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .end-download-card .button {
    width: 100%;
    justify-content: center;
  }
}

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