.blog-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-soft-line);
  background:
    radial-gradient(circle at 78% 46%, var(--color-glow-soft), transparent 34%),
    linear-gradient(145deg, var(--color-bg), var(--color-forest-deep));
}

.blog-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.85fr);
  align-items: center;
  min-height: clamp(28rem, 70vh, 46rem);
  gap: var(--space-8);
}

.blog-hero-copy {
  position: relative;
  z-index: 1;
  max-width: 48rem;
}

.blog-kicker,
.section-kicker,
.promo-brand {
  display: inline-block;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.blog-hero h1 {
  max-width: none;
  margin: var(--space-3) 0 var(--space-4);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: pretty;
}

.blog-hero-copy > p {
  max-width: 38rem;
  margin: 0;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.8;
}

.blog-hero-vein {
  position: relative;
  width: 100%;
  filter: drop-shadow(0 0 1.5rem var(--color-glow-soft));
}

.blog-hero-vein svg {
  display: block;
  width: 100%;
  height: auto;
}

.blog-leaf-body {
  fill: var(--color-soft-accent);
  stroke: var(--color-accent-dark);
  stroke-width: 2;
}

.blog-leaf-main,
.blog-leaf-branch {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.blog-leaf-main {
  stroke: var(--color-accent);
  stroke-width: 5;
}

.blog-leaf-branch {
  stroke: var(--color-border);
  stroke-width: 2;
}

.blog-leaf-node {
  fill: var(--color-accent);
  stroke: var(--color-panel);
  stroke-width: 3;
}

.blog-index-section {
  position: relative;
  overflow-x: clip;
}

.blog-index-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.blog-index-heading h2 {
  margin: var(--space-2) 0 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: -0.015em;
}

.blog-index-heading > p {
  margin: 0;
  color: var(--color-text-muted);
}

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.blog-filter-button {
  appearance: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  padding: 0.7rem 1rem;
  font: inherit;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.blog-filter-button:hover {
  color: var(--color-text);
  border-color: var(--color-accent-dark);
  transform: translateY(-1px);
}

.blog-filter-button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

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

.blog-result-status {
  min-height: 1.5em;
  margin: 0 0 var(--space-5);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.blog-article-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.article-card,
.related-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xlarge);
  background:
    linear-gradient(145deg, var(--color-panel-strong), var(--color-panel));
  padding: var(--space-6);
  transition:
    border-color var(--transition-medium),
    transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.article-card::before,
.related-card::before {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 3rem;
  height: 1px;
  background: var(--color-accent-dark);
  content: "";
  transform: rotate(-28deg);
  transform-origin: right center;
}

.article-card:hover,
.related-card:hover {
  border-color: var(--color-accent-dark);
  box-shadow: 0 1.1rem 3rem var(--color-glow-soft);
  transform: translateY(-4px);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.article-meta .tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.8rem;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  background: var(--color-soft-accent);
  color: var(--color-accent);
  padding: 0.25rem 0.65rem;
  font-family: var(--font-body);
  font-weight: 700;
}

.article-card h3,
.related-card h3 {
  margin: 0 0 var(--space-3);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.article-card p,
.related-card p {
  margin: 0 0 var(--space-5);
  color: var(--color-text-muted);
  line-height: 1.8;
}

.article-link {
  display: inline-flex;
  align-items: center;
  margin-top: auto;
  color: var(--color-accent);
  font-weight: 800;
  text-decoration: none;
}

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

.article-link:focus-visible {
  border-radius: var(--radius-small);
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

.blog-empty-state {
  grid-column: 1 / -1;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-panel);
  padding: var(--space-7);
  text-align: center;
}

.blog-empty-state h2,
.blog-empty-state h3 {
  margin: 0 0 var(--space-2);
  color: var(--color-text);
}

.blog-empty-state p {
  margin: 0;
  color: var(--color-text-muted);
}

.blog-signup-band,
.promo-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  overflow: hidden;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-xlarge);
  background:
    radial-gradient(circle at 88% 20%, var(--color-soft-accent-strong), transparent 32%),
    var(--color-panel-strong);
  padding: var(--space-7);
}

.blog-signup-band h2,
.promo-block h2 {
  margin: var(--space-2) 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  letter-spacing: -0.01em;
}

.blog-signup-band p,
.promo-block p {
  margin: 0;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.blog-signup-actions {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* 文章页：面包屑与固定页头之间保留清晰呼吸空间。 */
.blog-breadcrumb {
  margin-top: var(--space-6);
  padding-top: var(--space-2);
}

.blog-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  list-style: none;
}

.blog-breadcrumb li:not(:last-child)::after {
  margin-left: var(--space-2);
  color: var(--color-border);
  content: "／";
}

.blog-breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.blog-breadcrumb a:hover {
  color: var(--color-accent);
}

.article-hero {
  padding-top: var(--space-7);
  padding-bottom: var(--space-8);
}

.article-hero-inner {
  max-width: var(--content-width);
}

.article-hero h1 {
  max-width: none;
  margin: var(--space-4) 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  /* base.css 的 balance 会把中日韩标题从词中间对半折断,博客标题回归自然换行 */
  text-wrap: pretty;
}

.article-hero-summary {
  max-width: 44rem;
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.02rem;
  line-height: 1.8;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--content-width));
  justify-content: center;
}

.prose {
  min-width: 0;
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.9;
}

.prose h2,
.prose h3 {
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.3;
}

.prose h2 {
  margin: var(--space-8) 0 var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: clamp(1.35rem, 2.2vw, 1.5rem);
  letter-spacing: -0.01em;
}

.prose h3 {
  margin: var(--space-6) 0 var(--space-3);
  font-size: clamp(1.12rem, 1.8vw, 1.22rem);
}

.prose p,
.prose ul,
.prose ol {
  margin-top: 0;
  margin-bottom: var(--space-4);
}

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

.prose strong {
  color: var(--color-text);
}

.prose blockquote {
  margin: var(--space-6) 0;
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-medium) var(--radius-medium) 0;
  background: var(--color-panel);
  padding: var(--space-4) var(--space-5);
  color: var(--color-text);
}

.prose pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-forest-deep);
  padding: var(--space-5);
  color: var(--color-text);
  font-family: var(--font-mono);
}

.prose code {
  border-radius: var(--radius-small);
  background: var(--color-soft-text);
  color: var(--color-accent);
  padding: 0.12em 0.35em;
  font-family: var(--font-mono);
  overflow-wrap: anywhere;
}

.prose pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

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

.prose th,
.prose td {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3);
  text-align: left;
  vertical-align: top;
}

.prose th {
  color: var(--color-text);
}

.callout {
  margin: var(--space-6) 0;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background: var(--color-soft-accent);
  padding: var(--space-5);
}

.callout-title {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-accent);
}

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

.promo-block {
  max-width: var(--content-width);
  margin: var(--space-9) auto var(--space-8);
}

.promo-copy {
  min-width: 0;
}

#related-posts {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: var(--space-8) var(--gutter);
}

#related-posts > h2 {
  margin: 0 0 var(--space-5);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);
  letter-spacing: -0.015em;
}

.related-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.related-card {
  padding: var(--space-5);
}

.related-card::before {
  top: var(--space-5);
  right: var(--space-5);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  max-width: var(--page-width);
  margin: 0 auto var(--space-9);
  padding: 0 var(--gutter);
}

.post-nav-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-panel);
  padding: var(--space-5);
  color: var(--color-text);
  text-decoration: none;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.post-nav-card:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-panel-strong);
  transform: translateY(-2px);
}

.post-nav-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

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

.post-nav-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.post-nav-card strong {
  overflow-wrap: anywhere;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .blog-hero-layout {
    grid-template-columns: 1fr;
    padding-top: var(--space-8);
    padding-bottom: var(--space-7);
  }

  .blog-hero h1 {
    max-width: none;
  }

  .blog-hero-vein {
    max-width: 38rem;
    margin-inline: auto;
  }

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

@media (max-width: 700px) {
  .blog-index-heading,
  .blog-signup-band,
  .promo-block {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .article-card,
  .related-card {
    padding: var(--space-5);
  }

  .blog-signup-actions {
    width: 100%;
  }

  .blog-signup-actions .button,
  .promo-block .button {
    width: 100%;
  }

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

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

  .prose table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
  }
}

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

  .article-card:hover,
  .related-card:hover,
  .post-nav-card:hover,
  .blog-filter-button:hover {
    transform: none;
  }
}