:root {
  --color-canvas: #FFFFFF;
  --color-surface: #F7F7F8;
  --color-surface-raised: #FFFFFF;
  --color-engine: #121316;
  --color-engine-side: #191B1F;
  --color-engine-active: #292C32;
  --color-engine-line: #343840;
  --color-engine-text: #F5F6F8;
  --color-engine-muted: #A7ADB8;
  --color-border: #E4E5E9;
  --color-accent: #FFB224;
  --color-accent-strong: #D98F00;
  --color-accent-soft: #FFF3D9;
  --color-accent-ink: #744900;
  --color-text: #17191C;
  --color-text-muted: #5E6470;
  --color-success: #23B8A2;
  --color-warning: #E09A00;
  --color-error: #F0564A;
  --color-link: #795000;
  --color-focus-ring: #8A5B00;
  --color-code-bg: #EEEFF2;
  --color-quote-line: #C9CBD1;
  --color-separator: #B8BBC3;
  --font-display: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Consolas, "Courier New", monospace;
  --radius-large: 24px;
  --radius-medium: 12px;
  --radius-small: 8px;
  --radius-pill: 999px;
  --content-width: 1128px;
  --reading-width: 760px;
  --related-width: 820px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --space-blog-hero: clamp(4.5rem, 10vw, 8.5rem);
  --space-blog-section: clamp(4rem, 8vw, 7rem);
  --space-article-section: 2.5rem;
  --line-thin: 1px;
  --filter-control-size: 2.75rem;
  --transition-fast: 160ms ease;
}

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

.blog-shell {
  width: min(calc(100% - (var(--gutter) * 2)), var(--content-width));
  margin-inline: auto;
}

.blog-hero {
  padding-block: var(--space-blog-hero);
  border-bottom: var(--line-thin) solid var(--color-border);
}

.blog-eyebrow {
  margin: 0 0 1.25rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.blog-hero h1 {
  max-width: 10ch;
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2.125rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.065em;
  line-height: 0.93;
}

.blog-hero-lead {
  max-width: 38rem;
  margin: 2rem 0 0;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 0.9rem + 0.4vw, 1.25rem);
  line-height: 1.75;
}

.blog-list-section {
  padding-block: var(--space-blog-section);
}

.blog-list-head {
  display: grid;
  grid-template-columns: minmax(12rem, 0.7fr) minmax(20rem, 1.3fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 3rem;
}

.blog-list-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.5rem + 1.7vw, 3rem);
  line-height: 1.1;
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.625rem;
}

.tag-filter {
  min-height: var(--filter-control-size);
  padding: 0.65rem 1rem;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font: 600 0.875rem/1 var(--font-body);
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.tag-filter:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.tag-filter.is-active {
  border-color: var(--color-engine);
  background: var(--color-engine);
  color: var(--color-engine-text);
}

.tag-filter:focus-visible,
.post-card a:focus-visible,
.related-post-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: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
}

.post-list {
  border-top: var(--line-thin) solid var(--color-border);
}

.post-card {
  display: grid;
  grid-template-columns: minmax(9rem, 0.36fr) minmax(0, 1.64fr);
  column-gap: clamp(1.5rem, 5vw, 4.5rem);
  padding-block: clamp(2rem, 4vw, 3.5rem);
  border-bottom: var(--line-thin) solid var(--color-border);
}

.post-card-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding-inline: 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent-ink);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
}

.post-card h3 {
  grid-column: 2;
  margin: -2.9rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.1rem + 0.8vw, 2rem);
  line-height: 1.38;
}

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

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

.post-card > p {
  grid-column: 2;
  max-width: 46rem;
  margin: 1rem 0 0;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.post-card-link {
  grid-column: 2;
  justify-self: start;
  margin-top: 1.25rem;
  color: var(--color-link);
  font-weight: 700;
  text-decoration: none;
}

.post-card-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.22em;
}

.post-list-empty {
  margin: 0;
  padding-block: 3rem;
  color: var(--color-text-muted);
}

/* Article shell and compact first-screen rhythm */
.article-shell {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
}

.article-breadcrumb-section,
.blog-breadcrumb-wrap {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: 0 auto 1.25rem;
  padding-top: 1.5rem;
}

.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  line-height: 1.4;
  white-space: nowrap;
}

main > nav.breadcrumb,
main > nav.breadcrumbs,
main.prose > nav {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: 0 auto 1.25rem;
  padding-top: 1.5rem;
}

main.prose > nav ol {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
  list-style: none;
  white-space: nowrap;
}

main.prose > nav li {
  flex: 0 0 auto;
  min-width: 0;
  margin: 0;
}

main.prose > nav li + li::before {
  margin-right: 0.55rem;
  color: var(--color-separator);
  content: "→";
}

main.prose > nav [aria-current="page"] {
  flex: 0 1 30ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.blog-breadcrumb a,
nav.breadcrumb a,
nav.breadcrumbs a {
  flex: 0 0 auto;
  color: var(--color-text-muted);
  opacity: 0.78;
  text-decoration: none;
}

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

.blog-breadcrumb .breadcrumb-separator,
nav.breadcrumb .breadcrumb-separator,
nav.breadcrumbs .breadcrumb-separator {
  flex: 0 0 auto;
  color: var(--color-separator);
  opacity: 0.7;
}

.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(--color-text-muted);
  text-overflow: ellipsis;
}

.article-hero {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
  padding: 0.5rem 0 0.75rem;
}

main.prose {
  width: 100%;
  padding-bottom: 0;
}

main.prose > article {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
}

main.prose > article > .article-hero {
  width: 100%;
}

.article-hero > p {
  margin-bottom: 0;
}

main.prose > article > h2:first-child,
main.prose > article > .article-hero + h2 {
  margin-top: 1rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin: 0 0 0.875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

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

.article-lead,
.article-summary {
  margin: 0.75rem 0 0;
  color: var(--color-text-muted);
  font-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  line-height: 1.7;
}

.prose {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
  padding-bottom: var(--space-article-section);
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.85;
}

.prose > section {
  margin: 0;
  padding: 0;
}

.prose > section + section {
  margin-top: 2.5rem;
}

.prose h2 {
  max-width: 100%;
  margin: 2.5rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.15rem + 0.55vw, 1.5rem);
  line-height: 1.4;
}

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

.prose h3 {
  margin: 2rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 1.02rem + 0.35vw, 1.25rem);
  line-height: 1.45;
}

.prose p {
  margin: 0 0 1.25rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.5rem;
  padding-left: 1.4rem;
}

.prose li + li {
  margin-top: 0.55rem;
}

.prose a:not([class*="btn"]):not([class*="button"]) {
  color: var(--color-link);
  text-decoration-thickness: var(--line-thin);
  text-underline-offset: 0.2em;
}

.prose code {
  padding: 0.12em 0.36em;
  border-radius: var(--radius-small);
  background: var(--color-code-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.prose pre {
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 1.25rem;
  overflow-x: auto;
  border: var(--line-thin) solid var(--color-engine-line);
  border-radius: var(--radius-medium);
  background: var(--color-engine);
  color: var(--color-engine-text);
  font: 0.875rem/1.75 var(--font-mono);
}

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

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--color-quote-line);
  color: var(--color-text-muted);
}

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

.table-wrap,
.prose > .data-table {
  max-width: 100%;
  margin-block: 1.5rem;
  overflow-x: auto;
}

.prose .data-table {
  width: 100%;
  border-collapse: collapse;
}

.prose .data-table th,
.prose .data-table td {
  padding: 0.8rem 0.9rem;
  border: var(--line-thin) solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.prose .data-table th {
  background: var(--color-surface);
}

.article-download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: 2.5rem auto 0;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: var(--radius-large);
  background: var(--color-engine);
  color: var(--color-engine-text);
}

.article-download-card h2 {
  margin: 0 0 0.65rem;
  color: var(--color-engine-text);
}

.article-download-card p {
  margin: 0;
  color: var(--color-engine-muted);
}

.article-download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.article-related {
  width: min(calc(100% - (var(--gutter) * 2)), var(--related-width));
  margin: 3rem auto 0;
}

#related-posts {
  width: min(calc(100% - (var(--gutter) * 2)), var(--related-width));
  margin: 3rem auto 0;
}

#related-posts > h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.related-post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(300px, 1fr));
  gap: 1rem;
}

.related-post-card {
  min-width: 0;
  padding: 1.4rem;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface-raised);
}

.related-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.9rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.related-post-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.5;
}

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

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

.related-post-card p {
  margin: 0.8rem 0 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.post-navigation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  width: min(calc(100% - (var(--gutter) * 2)), var(--related-width));
  margin: 2.5rem auto 5rem;
}

.post-nav-card {
  display: flex;
  min-width: 0;
  min-height: 8rem;
  flex-direction: column;
  gap: 0.65rem;
  justify-content: center;
  padding: 1.35rem;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
}

.post-nav-card:hover {
  border-color: var(--color-text-muted);
}

.post-nav-label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.post-nav-card strong {
  font-size: 0.95rem;
  line-height: 1.55;
}

.post-nav-older {
  grid-column: 2;
  text-align: right;
}

@media (max-width: 820px) {
  .blog-list-head {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .tag-filters {
    justify-content: flex-start;
  }

  .post-card {
    grid-template-columns: 1fr;
  }

  .post-card-meta {
    flex-direction: row;
    align-items: center;
  }

  .post-card h3,
  .post-card > p,
  .post-card-link {
    grid-column: 1;
  }

  .post-card h3 {
    margin: 1.25rem 0 0;
  }

  .article-download-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .blog-hero h1 {
    font-size: clamp(1.5rem, 7vw, 1.875rem);
    line-height: 1.08;
  }

  .related-post-grid,
  .post-navigation {
    grid-template-columns: 1fr;
  }

  .post-nav-older {
    grid-column: 1;
    text-align: left;
  }

  .article-download-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .blog-hero {
    padding-block: 4rem;
  }

  .blog-list-section {
    padding-block: 3.5rem;
  }

  .tag-filters {
    flex-wrap: nowrap;
    margin-inline: calc(var(--gutter) * -1);
    padding-inline: var(--gutter);
    overflow-x: auto;
  }

  .tag-filter {
    flex: 0 0 auto;
  }

  .article-breadcrumb-section,
  .blog-breadcrumb-wrap {
    padding-top: 1.25rem;
  }

  .article-hero {
    padding-bottom: 1.75rem;
  }
}