:root {
  --blog-reading-width: 56rem;
  --blog-narrow-width: 44rem;
  --blog-window-bar: color-mix(in srgb, var(--color-panel-soft) 88%, var(--color-border));
  --blog-accent-tint: color-mix(in srgb, var(--color-accent) 9%, var(--color-panel));
  --blog-accent-tint-strong: color-mix(in srgb, var(--color-accent) 16%, var(--color-panel));
  --blog-success-tint: color-mix(in srgb, var(--color-success) 10%, var(--color-panel));
  --blog-warning-tint: color-mix(in srgb, var(--color-warning) 11%, var(--color-panel));
  --blog-error-tint: color-mix(in srgb, var(--color-error) 9%, var(--color-panel));
  --blog-text-inverse: var(--color-panel);
  --blog-code-bg: color-mix(in srgb, var(--color-text) 96%, var(--color-panel));
  --blog-code-text: color-mix(in srgb, var(--color-panel) 91%, var(--color-border));
  --blog-row-alt: color-mix(in srgb, var(--color-panel-soft) 76%, var(--color-panel));
  --blog-row-hover: color-mix(in srgb, var(--color-accent) 6%, var(--color-panel));
  --blog-focus-ring: color-mix(in srgb, var(--color-accent) 28%, var(--color-panel));
  --blog-promo-bg: color-mix(in srgb, var(--color-text) 94%, var(--color-accent));
  --blog-promo-muted: color-mix(in srgb, var(--color-panel) 76%, var(--color-border));
  --blog-transparent: color-mix(in srgb, var(--color-panel) 0%, transparent);
}

.no-break {
  white-space: nowrap;
}

.blog-reading-column,
.article-breadcrumbs,
.article-hero,
.article-body,
.post-body,
article.prose,
.end-promo,
#related-posts,
#post-nav {
  width: min(calc(100% - (var(--gutter) * 2)), var(--blog-reading-width));
  margin-inline: auto;
}

.blog-list-hero {
  padding-block: clamp(4.5rem, 10vw, 8rem) clamp(3.5rem, 7vw, 6rem);
  border-bottom: 1px solid var(--color-border);
}

.blog-kicker,
.section-index {
  margin: 0 0 1rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.blog-list-hero h1 {
  max-width: 46rem;
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 7vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: pretty;
}

.blog-lead {
  max-width: 42rem;
  margin: 1.35rem 0 0;
  color: var(--color-muted);
  font-size: 1.06rem;
  line-height: 1.85;
}

.blog-fact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.8rem;
}

.blog-fact-line span {
  padding: 0.48rem 0.72rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-panel);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

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

.blog-toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-toolbar h2 {
  margin: 0;
  color: var(--color-text);
  font-size: clamp(1.5rem, 4vw, 2rem);
  letter-spacing: -0.015em;
  text-wrap: pretty;
}

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.blog-filter button {
  appearance: none;
  padding: 0.56rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-panel);
  color: var(--color-muted);
  font: 600 0.86rem/1 var(--font-body);
  cursor: pointer;
  transition:
    border-color 180ms ease,
    color 180ms ease,
    background-color 180ms ease;
}

.blog-filter button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

.blog-filter button:focus-visible,
.article-card a:focus-visible,
.related-card a:focus-visible,
.post-nav-card:focus-visible {
  outline: 3px solid var(--blog-focus-ring);
  outline-offset: 3px;
}

.article-list {
  display: grid;
  gap: 0;
}

.article-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.8rem 2rem;
  padding-block: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.article-card:first-child {
  border-top: 1px solid var(--color-border);
}

.article-card::before {
  position: absolute;
  top: 2rem;
  bottom: 2rem;
  left: 0;
  width: 0.18rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  opacity: 0;
  content: "";
  transition: opacity 180ms ease;
}

.article-card:hover::before {
  opacity: 1;
}

.article-meta {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.article-tag {
  padding: 0.3rem 0.48rem;
  border-radius: var(--radius-xs);
  background: var(--blog-accent-tint);
  color: var(--color-accent-dark);
  font-weight: 700;
}

.article-card h3 {
  grid-column: 1;
  margin: 0;
  font-size: clamp(1.15rem, 3vw, 1.35rem);
  line-height: 1.48;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

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

.article-card h3 a:hover {
  color: var(--color-accent);
}

.article-card p {
  grid-column: 1;
  max-width: 46rem;
  margin: 0;
  color: var(--color-muted);
  font-size: 0.96rem;
  line-height: 1.78;
}

.article-read-link {
  grid-column: 2;
  grid-row: 2 / span 2;
  align-self: center;
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.article-read-link::after {
  margin-left: 0.35rem;
  content: "→";
}

.blog-empty {
  padding: 3rem 1rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-s);
  color: var(--color-muted);
  text-align: center;
}

.blog-bottom-note {
  padding-block: 0 clamp(4rem, 8vw, 7rem);
}

.lecture-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.lecture-note h2 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  text-wrap: pretty;
}

.lecture-note p:not(.section-index) {
  max-width: 40rem;
  margin: 0.75rem 0 0;
  color: var(--color-muted);
  line-height: 1.75;
}

.article-breadcrumbs {
  margin-top: 1.5rem;
  padding-top: 0.4rem;
  color: var(--color-muted);
  font-size: 0.84rem;
}

.article-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-breadcrumbs li:not(:last-child)::after {
  margin-left: 0.45rem;
  color: var(--color-border);
  content: "/";
}

.article-breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
}

.article-breadcrumbs a:hover {
  color: var(--color-accent);
}

.article-hero {
  position: relative;
  overflow: hidden;
  margin-top: 1.4rem;
  padding: 5.4rem clamp(1.5rem, 5vw, 3.25rem) clamp(2rem, 5vw, 3.25rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.article-hero::before {
  position: absolute;
  inset: 0 0 auto;
  height: 3rem;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 1.4rem 50%, var(--color-error) 0 0.3rem, var(--blog-transparent) 0.32rem),
    radial-gradient(circle at 2.5rem 50%, var(--color-warning) 0 0.3rem, var(--blog-transparent) 0.32rem),
    radial-gradient(circle at 3.6rem 50%, var(--color-success) 0 0.3rem, var(--blog-transparent) 0.32rem),
    linear-gradient(90deg, var(--blog-window-bar), var(--color-panel-soft));
  content: "";
}

.article-hero::after {
  position: absolute;
  top: 0.92rem;
  right: 1.2rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  content: "article.md";
}

.article-hero .article-meta,
.post-hero-meta {
  display: flex;
  grid-column: auto;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem;
}

.article-hero .article-meta > *,
.post-hero-meta > * {
  padding: 0.38rem 0.58rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.article-hero .article-meta .article-tag,
.post-hero-meta .article-tag {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--blog-text-inverse);
}

.article-hero h1 {
  max-width: 50rem;
  margin: 1.15rem 0 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 2.6rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  text-wrap: pretty;
}

.article-hero > p:last-child,
.article-hero .article-summary {
  max-width: 48rem;
  margin: 1rem 0 0;
  color: var(--color-muted);
  font-size: 1.02rem;
  line-height: 1.82;
}

.article-body,
.post-body,
article.prose {
  counter-reset: blog-section;
  padding: 2.5rem clamp(1.5rem, 5vw, 3.25rem) 1rem;
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.85;
}

.article-body > h2,
.post-body > h2,
article.prose > h2 {
  counter-increment: blog-section;
  position: relative;
  margin: 3.2rem 0 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: clamp(1.35rem, 4vw, 1.6rem);
  line-height: 1.42;
  letter-spacing: -0.015em;
  text-wrap: pretty;
}

.article-body > h2::before,
.post-body > h2::before,
article.prose > h2::before {
  display: block;
  margin-bottom: 0.48rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  content: "§" counter(blog-section, decimal-leading-zero);
}

.article-body h3,
.post-body h3,
article.prose h3 {
  margin: 2.2rem 0 0.8rem;
  font-size: clamp(1.12rem, 3vw, 1.3rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.article-body p,
.post-body p,
article.prose p {
  margin: 0 0 1.25rem;
}

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

.article-body li,
.post-body li,
article.prose li {
  margin-block: 0.5rem;
  padding-left: 0.2rem;
}

.article-body a,
.post-body a,
article.prose a {
  color: var(--color-accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.article-body blockquote,
.post-body blockquote,
article.prose blockquote {
  margin: 1.75rem 0;
  padding: 1rem 1.25rem;
  border-left: 0.22rem solid var(--color-accent);
  background: var(--blog-accent-tint);
  color: var(--color-text);
}

.article-body blockquote p:last-child,
.post-body blockquote p:last-child,
article.prose blockquote p:last-child {
  margin-bottom: 0;
}

.callout {
  position: relative;
  margin-block: 1.8rem;
  padding: 1.15rem 1.25rem 1.15rem 3.6rem;
  border: 1px solid var(--color-border);
  border-left: 0.24rem solid var(--color-accent);
  border-radius: var(--radius-s);
  background: var(--blog-accent-tint);
}

.callout::before {
  position: absolute;
  top: 1.05rem;
  left: 1.05rem;
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border-radius: var(--radius-xs);
  background: var(--color-accent);
  color: var(--blog-text-inverse);
  font: 700 0.82rem/1 var(--font-mono);
  content: "i";
}

.callout.warning {
  border-left-color: var(--color-warning);
  background: var(--blog-warning-tint);
}

.callout.warning::before {
  background: var(--color-warning);
  content: "!";
}

.callout.success {
  border-left-color: var(--color-success);
  background: var(--blog-success-tint);
}

.callout.success::before {
  background: var(--color-success);
  content: "✓";
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.8rem;
  margin-block: 1.8rem;
}

.stat-card {
  position: relative;
  overflow: hidden;
  min-height: 7.5rem;
  padding: 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  background: var(--color-panel);
}

.stat-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 0.22rem;
  background: var(--color-accent);
  content: "";
}

.stat-card:nth-child(even) {
  background: var(--blog-accent-tint);
}

.stat-card:nth-child(3n)::before {
  background: var(--color-success);
}

.stat-num {
  display: block;
  margin-top: 0.35rem;
  color: var(--color-text);
  font: 750 clamp(1.45rem, 5vw, 2rem)/1.15 var(--font-mono);
}

.stat-label {
  display: block;
  margin-top: 0.55rem;
  color: var(--color-muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.check-list {
  margin-block: 1.6rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  background: var(--color-panel);
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: 0.85rem 1rem;
}

.check-list li + li {
  border-top: 1px solid var(--color-border);
}

.verdict {
  margin-block: 1.8rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--color-border);
  border-left: 0.28rem solid var(--color-accent);
  border-radius: var(--radius-xs);
  background: var(--blog-accent-tint);
}

.verdict strong:first-child {
  color: var(--color-accent-dark);
}

.article-body table,
.post-body table,
article.prose table {
  width: 100%;
  margin-block: 1.8rem;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.article-body th,
.article-body td,
.post-body th,
.post-body td,
article.prose th,
article.prose td {
  min-width: 8.5rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.article-body thead th,
.post-body thead th,
article.prose thead th {
  background: var(--color-text);
  color: var(--blog-text-inverse);
  font-weight: 700;
}

.article-body tbody tr:nth-child(even),
.post-body tbody tr:nth-child(even),
article.prose tbody tr:nth-child(even) {
  background: var(--blog-row-alt);
}

.article-body tbody tr:hover,
.post-body tbody tr:hover,
article.prose tbody tr:hover {
  background: var(--blog-row-hover);
}

.article-body pre,
.post-body pre,
article.prose pre {
  position: relative;
  overflow-x: auto;
  margin-block: 1.8rem;
  padding: 3.2rem 1.2rem 1.25rem;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-s);
  background: var(--blog-code-bg);
  color: var(--blog-code-text);
  font: 0.86rem/1.75 var(--font-mono);
}

.article-body pre::before,
.post-body pre::before,
article.prose pre::before {
  position: absolute;
  inset: 0 0 auto;
  height: 2.2rem;
  border-bottom: 1px solid var(--color-muted);
  background:
    radial-gradient(circle at 1.1rem 50%, var(--color-error) 0 0.25rem, var(--blog-transparent) 0.27rem),
    radial-gradient(circle at 2rem 50%, var(--color-warning) 0 0.25rem, var(--blog-transparent) 0.27rem),
    radial-gradient(circle at 2.9rem 50%, var(--color-success) 0 0.25rem, var(--blog-transparent) 0.27rem);
  content: "";
}

.article-body pre code,
.post-body pre code,
article.prose pre code {
  color: inherit; /* base.css 的 code{color:var(--color-text)} 会在深底代码块里压成深字深底 */
}

.article-body code,
.post-body code,
article.prose code {
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
}

.article-body :not(pre) > code,
.post-body :not(pre) > code,
article.prose :not(pre) > code {
  padding: 0.15rem 0.32rem;
  background: var(--color-panel-soft);
  color: var(--color-accent-dark);
}

.end-promo {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 2.5rem;
  padding: clamp(1.5rem, 5vw, 2.5rem);
  border: 1px solid var(--color-text);
  border-radius: var(--radius-m);
  background: var(--blog-promo-bg);
  color: var(--blog-text-inverse);
}

.end-promo::before {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 4rem;
  height: 4rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  content: "";
}

.end-promo::after {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  content: "";
}

.end-promo > * {
  position: relative;
  z-index: 1;
}

.end-promo h2 {
  margin: 0;
  color: var(--blog-text-inverse);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  text-wrap: pretty;
}

.end-promo p {
  max-width: 38rem;
  margin: 0.7rem 0 0;
  color: var(--blog-promo-muted);
  line-height: 1.7;
}

.end-promo .btn-primary {
  flex: 0 0 auto;
  border-color: var(--color-panel);
  background: var(--color-panel);
  color: var(--color-text);
}

.end-promo .btn-primary:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--blog-text-inverse);
}

#related-posts {
  padding-top: 2.8rem;
}

#related-posts > h2 {
  margin: 0 0 1.1rem;
  font-size: 1.45rem;
  text-wrap: pretty;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.related-card {
  position: relative;
  padding: 1.15rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  background: var(--color-panel);
  transition:
    border-color 180ms ease,
    transform 180ms ease,
    box-shadow 180ms ease;
}

.related-card::before {
  position: absolute;
  inset: -1px -1px auto;
  height: 0.18rem;
  border-radius: var(--radius-s) var(--radius-s) 0 0;
  background: var(--color-accent);
  opacity: 0;
  content: "";
  transition: opacity 180ms ease;
}

.related-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
  transform: translateY(-0.18rem);
}

.related-card:hover::before {
  opacity: 1;
}

.related-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.related-meta span {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.related-card h3 {
  margin: 0.8rem 0 0;
  font-size: 1rem;
  line-height: 1.55;
  text-wrap: pretty;
}

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

.related-card p {
  margin: 0.65rem 0 0;
  color: var(--color-muted);
  font-size: 0.84rem;
  line-height: 1.65;
}

#post-nav {
  padding-block: 1.3rem 2.5rem;
}

.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.post-nav-card {
  position: relative;
  display: flex;
  min-height: 7rem;
  flex-direction: column;
  justify-content: center;
  padding: 1.15rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  background: var(--color-panel);
  color: var(--color-text);
  text-decoration: none;
  transition:
    border-color 180ms ease,
    transform 180ms ease;
}

.post-nav-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-0.16rem);
}

.post-nav-label {
  margin-bottom: 0.45rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

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

@media (max-width: 860px) {
  .article-body table,
  .post-body table,
  article.prose table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
  }

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

@media (max-width: 720px) {
  .blog-toolbar,
  .lecture-note,
  .end-promo {
    align-items: stretch;
    flex-direction: column;
  }

  .blog-filter {
    width: 100%;
  }

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

  .article-read-link {
    grid-column: 1;
    grid-row: auto;
  }

  .article-hero {
    padding-inline: 1.5rem;
  }

  .article-hero::after {
    display: none;
  }

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

  .end-promo::before,
  .end-promo::after {
    opacity: 0.45;
  }
}

@media (max-width: 480px) {
  .no-break {
    white-space: normal;
  }

  .blog-list-hero {
    padding-top: 3.5rem;
  }

  .blog-fact-line {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .blog-fact-line span {
    text-align: center;
  }

  .blog-filter button {
    flex: 1 1 auto;
  }

  .article-hero {
    padding-top: 4.8rem;
  }

  .callout {
    padding-left: 1.1rem;
    padding-top: 3.4rem;
  }

  .callout::before {
    top: 1rem;
  }
}

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

  .related-card:hover,
  .post-nav-card:hover {
    transform: none;
  }
}