:root {
  --blog-filter-idle: var(--color-panel);
  --blog-filter-active: var(--color-ink);
  --blog-filter-active-text: var(--color-canvas);
  --blog-card-background: var(--color-canvas);
  --blog-dialog-overlay: rgb(18 51 59 / 58%);
  --blog-dialog-background: var(--color-canvas);
  --blog-dialog-close-background: var(--color-panel);
  --blog-meta-opacity: 0.72;
  --blog-separator-opacity: 0.35;
  --blog-transition-fast: 180ms ease;
  --blog-transition-standard: 240ms ease;
  --blog-reading-width: 820px;
  --blog-card-min-width: 300px;
}

.blog-index {
  overflow-x: clip;
}

.blog-list-hero {
  padding-block: clamp(3.5rem, 8vw, 6.5rem) clamp(3rem, 6vw, 5rem);
  background: var(--gradient-soft);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.blog-list-hero .wrap {
  display: grid;
  gap: 1rem;
}

.blog-list-hero h1 {
  max-width: 18ch;
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.55rem + 2vw, 3rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.blog-list-hero p {
  max-width: 48rem;
  margin: 0;
  color: var(--color-ink-muted);
  font-size: clamp(1rem, 0.92rem + 0.35vw, 1.2rem);
  line-height: 1.75;
}

.blog-list-section {
  padding-block: clamp(3.5rem, 7vw, 6rem);
}

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

.blog-list-heading h2 {
  margin: 0.45rem 0 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
  line-height: 1.2;
}

.blog-result-count {
  flex-shrink: 0;
  margin: 0;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.blog-filter {
  display: flex;
  gap: 0.65rem;
  margin-bottom: 2rem;
  padding-bottom: 0.25rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.blog-filter-button {
  flex-shrink: 0;
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--blog-filter-idle);
  color: var(--color-ink-muted);
  font: 700 0.875rem/1 var(--font-body);
  cursor: pointer;
  transition:
    color var(--blog-transition-fast),
    background-color var(--blog-transition-fast),
    transform var(--blog-transition-fast);
}

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

.blog-filter-button:focus-visible {
  outline: 3px solid var(--color-action);
  outline-offset: 3px;
}

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

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

.article-card {
  display: flex;
  min-width: 0;
  min-height: 20rem;
  flex-direction: column;
  padding: clamp(1.4rem, 3vw, 2rem);
  border-radius: var(--radius-md);
  background: var(--blog-card-background);
  box-shadow: var(--shadow-card);
  transition:
    transform var(--blog-transition-standard),
    box-shadow var(--blog-transition-standard);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-raised);
}

.article-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.15rem;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.article-card h3 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 1.1rem + 0.35vw, 1.45rem);
  line-height: 1.42;
}

.article-card p {
  margin: 1rem 0 1.5rem;
  color: var(--color-ink-muted);
  font-size: 0.975rem;
  line-height: 1.8;
}

.article-card-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--color-action-hover);
  font-weight: 800;
  text-decoration: none;
}

.article-card-link:hover {
  color: var(--color-action);
}

.article-card-link:focus-visible {
  outline: 3px solid var(--color-action);
  outline-offset: 4px;
  border-radius: var(--radius-xs);
}

.blog-empty-state {
  grid-column: 1 / -1;
  margin: 0;
  padding: 3rem 1.5rem;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink-muted);
  text-align: center;
}

/* Article header and breadcrumb */

.article-page {
  overflow-x: clip;
}

.article-breadcrumb-section {
  padding-block: 1.25rem 0;
}

.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-ink-muted);
  font-size: 0.8125rem;
  line-height: 1.4;
  white-space: nowrap;
}

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

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

.blog-breadcrumb .separator,
nav.breadcrumb .separator,
nav.breadcrumbs .separator {
  flex-shrink: 0;
  opacity: var(--blog-separator-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;
  text-overflow: ellipsis;
}

.article-hero {
  padding-block: 0 2.25rem;
}

.article-hero .reading-wrap {
  padding-top: 0.75rem;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 0.875rem;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.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: 900;
  line-height: 1.32;
  letter-spacing: -0.025em;
}

.article-lead {
  max-width: 100%;
  margin: 0.9rem 0 0;
  color: var(--color-ink-muted);
  font-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  line-height: 1.7;
}

.article-body {
  padding-block: 0 2.5rem;
}

.article-body > section,
.prose > section {
  padding-block: 0;
}

.article-body > section + section,
.prose > section + section {
  margin-top: 3rem;
}

.prose {
  color: var(--color-ink);
  font-size: 1rem;
  line-height: 1.9;
}

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

.prose h2 {
  margin: 3rem 0 1rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.2rem + 0.55vw, 1.5rem);
  line-height: 1.4;
  scroll-margin-top: 6rem;
}

.prose h3 {
  margin: 2rem 0 0.8rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 1.05rem + 0.3vw, 1.25rem);
  line-height: 1.45;
}

.prose p {
  margin: 0 0 1.2rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.4rem;
  padding-inline-start: 1.4rem;
}

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

.prose a:not([class*="btn"]):not([class*="button"]) {
  color: var(--color-action-hover);
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

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

.prose code {
  overflow-wrap: anywhere;
  border-radius: var(--radius-xs);
  background: var(--color-panel-mint);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.prose :not(pre) > code {
  padding: 0.18em 0.42em;
}

.prose pre {
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 1.25rem;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-canvas);
  box-shadow: var(--shadow-card);
}

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

.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-inline-start: 0.3rem solid var(--color-mint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-panel);
  color: var(--color-ink-muted);
}

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

/* End-of-article download card */

.dl-card,
.end-download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2.5rem;
  padding: clamp(1.4rem, 4vw, 2.25rem);
  border-radius: var(--radius-lg);
  background: var(--gradient-soft);
  box-shadow: var(--shadow-card);
}

.dl-card h2,
.end-download-card h2 {
  margin: 0;
  color: var(--color-ink);
  font-size: clamp(1.3rem, 1.15rem + 0.55vw, 1.65rem);
  line-height: 1.35;
}

.dl-card p,
.end-download-card p {
  margin: 0.65rem 0 0;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

.dl-card .button-row,
.end-download-card .button-row {
  flex-shrink: 0;
}

/* Related articles */

.article-related {
  padding-block: 2.5rem;
}

#related-posts {
  margin-top: 2.5rem;
}

#related-posts > h2 {
  margin: 0 0 1.25rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.2rem + 0.55vw, 1.5rem);
}

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

.related-post-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 1.35rem;
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.related-post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.related-post-card h3 {
  margin: 1rem 0 0;
  font-size: 1.05rem;
  line-height: 1.5;
}

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

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

.related-post-card p {
  margin: 0.75rem 0 0;
  color: var(--color-ink-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

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

.post-nav-link {
  display: flex;
  min-width: 0;
  min-height: 8rem;
  flex-direction: column;
  gap: 0.55rem;
  justify-content: center;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: var(--color-canvas);
  color: var(--color-ink);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition:
    transform var(--blog-transition-fast),
    box-shadow var(--blog-transition-fast);
}

.post-nav-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-raised);
}

.post-nav-label {
  color: var(--color-action-hover);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.post-nav-link strong {
  overflow-wrap: anywhere;
  font-size: 0.95rem;
  line-height: 1.55;
}

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

/* Article download dialog */

.blog-dialog-open {
  overflow: hidden;
}

.blog-download-overlay {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: var(--blog-dialog-overlay);
  opacity: 0;
  transition: opacity var(--blog-transition-fast);
}

.blog-download-overlay[hidden] {
  display: none;
}

.blog-download-overlay.is-visible {
  opacity: 1;
}

.blog-download-dialog {
  position: relative;
  width: min(100%, 31rem);
  padding: clamp(1.5rem, 5vw, 2.5rem);
  border-radius: var(--radius-lg);
  background: var(--blog-dialog-background);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  transform: translateY(0.8rem) scale(0.98);
  transition: transform var(--blog-transition-fast);
}

.blog-download-overlay.is-visible .blog-download-dialog {
  transform: translateY(0) scale(1);
}

.blog-download-dialog h2 {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.3rem + 0.8vw, 2rem);
  line-height: 1.3;
}

.blog-download-dialog p {
  margin: 0.85rem 0 1.5rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

.blog-download-dialog-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--blog-dialog-close-background);
  color: var(--color-ink);
  font: 700 1.5rem/1 var(--font-body);
  cursor: pointer;
}

.blog-download-dialog-close:hover {
  color: var(--color-action-hover);
}

.blog-download-dialog-close:focus-visible {
  outline: 3px solid var(--color-action);
  outline-offset: 3px;
}

@media (max-width: 760px) {
  .blog-list-hero {
    padding-block: 3rem;
  }

  .blog-list-hero h1 {
    max-width: 100%;
    font-size: clamp(1.75rem, 1.45rem + 1.5vw, 1.875rem);
  }

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

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

  .article-card {
    min-height: 0;
  }

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

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

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

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

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

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

@media (max-width: 420px) {
  .blog-filter {
    margin-inline: calc(var(--gutter) * -1);
    padding-inline: var(--gutter);
  }

  .article-card {
    padding: 1.25rem;
  }

  .article-card-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .blog-download-dialog .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .blog-download-dialog .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card,
  .blog-filter-button,
  .post-nav-link,
  .blog-download-overlay,
  .blog-download-dialog {
    scroll-behavior: auto;
    transition: none;
  }
}