:root {
  --blog-reading: 56rem;
  --blog-gutter: max(1.5rem, var(--gutter));
  --blog-h1: clamp(1.85rem, 4.2vw, 2.6rem);
  --blog-list-h1: clamp(2rem, 4.8vw, 3rem);
  --blog-h2: clamp(1.3rem, 3vw, 1.6rem);
  --blog-h3: 1.3rem;
  --blog-body-size: 1rem;
  --blog-small: 0.85rem;
  --blog-tiny: 0.75rem;
  --blog-leading: 1.85;
  --blog-heading-leading: 1.4;
  --blog-tracking: -0.015em;
  --blog-card-radius: var(--r-card);
  --blog-pill-radius: var(--r-pill);
  --blog-tint: color-mix(in srgb, var(--accent) 7%, var(--panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 8%, var(--panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 10%, var(--panel));
  --blog-terminal: var(--text);
  --blog-terminal-text: var(--panel);
  --blog-promo-start: var(--accent-dark);
  --blog-promo-end: color-mix(in srgb, var(--accent) 75%, var(--text));
  --blog-chrome: linear-gradient(110deg, var(--canvas), var(--panel));
  --blog-rule: 1px solid var(--border);
  --blog-focus: 3px solid var(--accent);
  --blog-lift: translateY(-3px);
  --blog-transition: var(--speed) ease;
}

.blog-page {
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-body);
}

.blog-page *,
.reading-wrap *,
.article-hero * {
  box-sizing: border-box;
}

.blog-page h1,
.blog-page h2,
.blog-page h3,
.article-hero h1,
.article-content h2,
.article-content h3,
[data-blog-body] h2,
[data-blog-body] h3 {
  display: block;
  font-family: var(--f-display);
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
  line-height: var(--blog-heading-leading);
}

.blog-page a:focus-visible,
.blog-page button:focus-visible,
.reading-wrap a:focus-visible,
.float-cta:focus-visible {
  outline: var(--blog-focus);
  outline-offset: 4px;
  border-radius: var(--r-focus);
}

.blog-skip {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 1rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--panel);
  color: var(--text);
  border: var(--blog-rule);
  border-radius: var(--r-btn);
  transform: translateY(-180%);
}

.blog-skip:focus {
  transform: none;
}

.blog-index {
  padding-block: 2rem 3.5rem;
}

.blog-index-hero,
.article-hero {
  position: relative;
  overflow: hidden;
  border: var(--blog-rule);
  border-radius: var(--blog-card-radius);
  background: var(--panel);
  box-shadow: var(--shade-md);
}

.blog-index-hero {
  padding: 0 1.5rem 2rem;
}

.article-chrome {
  position: relative;
  min-height: 2.8rem;
  padding: 0.8rem 1rem 0.8rem 5rem;
  border-bottom: var(--blog-rule);
  background: var(--blog-chrome);
  color: var(--muted);
  font-family: var(--f-mono);
  font-size: var(--blog-tiny);
  text-align: right;
  overflow-wrap: anywhere;
}

.article-chrome::before {
  content: "";
  position: absolute;
  inset-inline-start: 1rem;
  inset-block-start: 1.05rem;
  width: 2.6rem;
  height: 0.65rem;
  background:
    radial-gradient(circle at 0.325rem 50%, var(--error) 0.25rem, var(--clear) 0.27rem),
    radial-gradient(circle at 1.3rem 50%, var(--warn) 0.25rem, var(--clear) 0.27rem),
    radial-gradient(circle at 2.275rem 50%, var(--success) 0.25rem, var(--clear) 0.27rem);
}

.blog-index-hero > .article-chrome {
  margin-inline: -1.5rem;
}

.blog-index-intro {
  max-width: 46rem;
  padding-block-start: 2rem;
}

.blog-eyebrow {
  color: var(--accent-dark);
  font-family: var(--f-mono);
  font-size: var(--blog-small);
}

.blog-index-hero h1 {
  margin-block: 0.6rem 1rem;
  font-size: var(--blog-list-h1);
  font-weight: var(--weight-display);
}

.blog-index-intro > p:last-child {
  margin-block-end: 0;
  color: var(--muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.blog-library {
  padding-block: 2rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.blog-filters button {
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: var(--blog-rule);
  border-radius: var(--r-btn);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: var(--blog-small);
  cursor: pointer;
  transition: border-color var(--blog-transition), background var(--blog-transition);
}

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

.blog-filters button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.blog-status {
  margin-block: 1rem 1.5rem;
  color: var(--muted);
  font-size: var(--blog-small);
  line-height: var(--blog-leading);
}

.blog-card-grid,
.related-grid,
.stat-grid,
#post-nav {
  display: grid;
  gap: 1.25rem;
}

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

.blog-card-grid > *,
.related-grid > *,
.stat-grid > *,
#post-nav > * {
  min-width: 0;
}

.article-card,
.related-card,
.post-nav-card {
  overflow: hidden;
  border: var(--blog-rule);
  border-radius: var(--blog-card-radius);
  background: var(--panel);
  box-shadow: var(--shade-sm);
  transition: transform var(--blog-transition), border-color var(--blog-transition);
}

.article-card:hover,
.article-card:focus-within,
.related-card:hover,
.related-card:focus-within,
.post-nav-card:hover {
  border-color: var(--accent);
  transform: var(--blog-lift);
}

.article-card {
  display: flex;
  flex-direction: column;
}

.article-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.5rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.6rem;
  color: var(--muted);
  font-size: var(--blog-small);
  line-height: 1.6;
}

.article-meta .tag {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border: 1px solid var(--accent);
  border-radius: var(--blog-pill-radius);
  background: var(--accent);
  color: var(--on-accent);
  font-size: var(--blog-tiny);
}

.article-card h2 {
  margin-block: 1rem 0.75rem;
  font-size: var(--blog-h2);
}

.article-card h2 a,
.related-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.article-card h2 a:hover,
.related-card h3 a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.article-body > p,
.related-card > p {
  margin-block: 0 1.25rem;
  color: var(--muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
  overflow-wrap: anywhere;
}

.article-read-link {
  margin-block-start: auto;
  color: var(--accent-dark);
  font-size: var(--blog-small);
  font-weight: var(--weight-bold);
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem 1.5rem;
  border: var(--blog-rule);
  border-radius: var(--blog-card-radius);
  background: var(--canvas);
  color: var(--muted);
  line-height: var(--blog-leading);
}

/* 阅读列的盒宽包含内衬；正文与窗口卡的内容左缘一致。 */
.reading-wrap,
.article-hero,
.breadcrumbs,
.blog-breadcrumbs {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) + var(--blog-gutter));
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.breadcrumbs,
.blog-breadcrumbs {
  margin-block: 1.5rem 1.25rem;
  padding-block-start: 0.25rem;
  color: var(--muted);
  font-size: var(--blog-small);
  line-height: var(--blog-leading);
  overflow-wrap: anywhere;
}

.breadcrumbs ol,
.blog-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li + li::before,
.blog-breadcrumbs li + li::before {
  content: "›";
  margin-inline-end: 0.65rem;
  color: var(--muted);
}

.breadcrumbs a,
.blog-breadcrumbs a {
  color: var(--muted);
  text-underline-offset: 0.2em;
}

.article-hero {
  padding-block: 0 1.75rem;
  margin-block-end: 1.75rem;
}

.article-hero > .article-chrome {
  margin-inline: calc(0rem - var(--blog-gutter));
  margin-block-end: 1.5rem;
}

.article-hero .article-meta > time,
.article-hero .article-meta > span:not(.tag),
.article-hero .article-meta > .read-time {
  padding: 0.2rem 0.65rem;
  border: var(--blog-rule);
  border-radius: var(--blog-pill-radius);
  background: var(--panel);
}

.article-hero h1 {
  margin-block: 1.1rem 1rem;
  font-size: var(--blog-h1);
  font-weight: var(--weight-display);
}

.article-hero > p,
.article-hero .article-summary {
  margin-block: 0;
  color: var(--muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.article-content,
[data-blog-body] {
  color: var(--text);
  font-family: var(--f-body);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
  overflow-wrap: anywhere;
  counter-reset: blog-section;
}

.article-content > :first-child,
[data-blog-body] > :first-child {
  margin-block-start: 0;
}

.article-content h2,
[data-blog-body] h2 {
  margin-block: 2.25rem 1rem;
  font-size: var(--blog-h2);
  font-weight: var(--weight-bold);
  scroll-margin-top: var(--anchor-space);
}

.article-content h2::before,
[data-blog-body] h2::before {
  counter-increment: blog-section;
  content: counter(blog-section, decimal-leading-zero);
  display: inline-block;
  margin-inline-end: 0.65rem;
  padding: 0.05rem 0.4rem;
  border-radius: var(--r-tool);
  background: var(--canvas);
  color: var(--accent-dark);
  font-family: var(--f-mono);
  font-size: var(--blog-small);
  vertical-align: 0.1em;
}

.article-content h3,
[data-blog-body] h3 {
  margin-block: 1.75rem 0.65rem;
  font-size: var(--blog-h3);
}

.article-content p,
[data-blog-body] p {
  margin-block: 0 1.2rem;
}

.article-content ul,
.article-content ol,
[data-blog-body] ul,
[data-blog-body] ol {
  margin-block: 1rem 1.5rem;
  padding-inline-start: 1.5rem;
}

.article-content li,
[data-blog-body] li {
  margin-block: 0.4rem;
}

.article-content a,
[data-blog-body] a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.article-content img,
[data-blog-body] img {
  max-width: 100%;
  height: auto;
  border-radius: var(--blog-card-radius);
}

.article-content blockquote,
[data-blog-body] blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-inline-start: 3px solid var(--accent);
  background: var(--canvas);
  color: var(--muted);
}

.article-content code,
[data-blog-body] code {
  padding: 0.1em 0.35em;
  border-radius: var(--r-tool);
  background: var(--canvas);
  color: var(--accent-dark);
  font-family: var(--f-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.article-content pre,
[data-blog-body] pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  padding: 2.75rem 1.25rem 1.25rem;
  border: 1px solid var(--blog-terminal);
  border-radius: var(--blog-card-radius);
  background: var(--blog-terminal);
  color: var(--blog-terminal-text);
  line-height: 1.8;
}

.article-content pre::before,
[data-blog-body] pre::before {
  content: "";
  position: absolute;
  inset-block-start: 1rem;
  inset-inline-start: 1.25rem;
  width: 2.6rem;
  height: 0.65rem;
  background:
    radial-gradient(circle at 0.325rem 50%, var(--error) 0.25rem, var(--clear) 0.27rem),
    radial-gradient(circle at 1.3rem 50%, var(--warn) 0.25rem, var(--clear) 0.27rem),
    radial-gradient(circle at 2.275rem 50%, var(--success) 0.25rem, var(--clear) 0.27rem);
}

.article-content pre code,
[data-blog-body] pre code {
  padding: 0;
  background: var(--clear);
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

.article-content .table-scroll,
[data-blog-body] .table-scroll {
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  border: var(--blog-rule);
  border-radius: var(--blog-card-radius);
}

.article-content table,
[data-blog-body] table {
  width: 100%;
  margin-block: 1.5rem;
  border-collapse: collapse;
  font-size: var(--blog-small);
  line-height: var(--blog-leading);
}

.article-content .table-scroll table,
[data-blog-body] .table-scroll table {
  margin: 0;
  min-width: 38rem;
}

.article-content caption,
[data-blog-body] caption {
  padding: 0.75rem 1rem;
  color: var(--muted);
  text-align: start;
}

.article-content th,
.article-content td,
[data-blog-body] th,
[data-blog-body] td {
  padding: 0.85rem 1rem;
  border-bottom: var(--blog-rule);
  text-align: start;
  vertical-align: top;
}

.article-content thead,
[data-blog-body] thead {
  background: var(--accent-dark);
  color: var(--on-accent);
}

.article-content tbody tr:nth-child(even),
[data-blog-body] tbody tr:nth-child(even) {
  background: var(--canvas);
}

.article-content tbody tr:hover,
[data-blog-body] tbody tr:hover {
  background: var(--blog-tint);
}

.callout,
.verdict {
  position: relative;
  margin-block: 1.5rem;
  padding: 1.15rem 1.25rem;
  border: var(--blog-rule);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--r-btn);
  background: var(--blog-tint);
  color: var(--text);
}

.callout {
  padding-inline-start: 3.25rem;
}

.callout::before {
  content: "i";
  position: absolute;
  inset-block-start: 1.2rem;
  inset-inline-start: 1rem;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: var(--r-circle);
  background: var(--accent-dark);
  color: var(--on-accent);
  font-family: var(--f-mono);
  font-size: var(--blog-small);
  font-weight: var(--weight-bold);
  line-height: 1.4rem;
  text-align: center;
}

.callout.warning,
.callout--warning,
.callout.is-warning {
  border-inline-start-color: var(--warn);
  background: var(--blog-warning-tint);
}

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

.callout.success,
.callout--success,
.callout.is-success {
  border-inline-start-color: var(--success);
  background: var(--blog-success-tint);
}

.callout.success::before,
.callout--success::before,
.callout.is-success::before {
  background: var(--text);
}

.callout > :last-child,
.verdict > :last-child {
  margin-block-end: 0;
}

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

.stat-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  margin-block: 1.5rem;
}

.stat-card {
  padding: 1.25rem;
  border: var(--blog-rule);
  border-block-start: 3px solid var(--accent);
  border-radius: var(--blog-card-radius);
  background: var(--blog-tint);
}

.stat-card:nth-child(even) {
  border-block-start-color: var(--success);
  background: var(--blog-success-tint);
}

.stat-num,
.stat-label {
  display: block;
}

.stat-num {
  color: var(--text);
  font-family: var(--f-mono);
  font-size: var(--blog-h2);
  font-weight: var(--weight-bold);
  line-height: var(--blog-heading-leading);
  overflow-wrap: anywhere;
}

.stat-label {
  margin-block-start: 0.5rem;
  color: var(--muted);
  font-size: var(--blog-small);
}

.article-content .check-list,
[data-blog-body] .check-list,
.check-list {
  display: grid;
  gap: 0.65rem;
  margin-block: 1.5rem;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: 0.85rem 1rem;
  border: var(--blog-rule);
  border-radius: var(--r-btn);
  background: var(--panel);
}

.promo-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: 1.75rem var(--blog-gutter);
  border: 1px solid var(--accent-dark);
  border-radius: var(--blog-card-radius);
  background: linear-gradient(120deg, var(--blog-promo-start), var(--blog-promo-end));
  color: var(--on-accent);
}

.promo-copy {
  flex: 1 1 18rem;
  min-width: 0;
}

.promo-copy strong {
  font-family: var(--f-display);
  font-size: var(--blog-h2);
  font-weight: var(--weight-display);
}

.promo-copy p {
  margin-block: 0.5rem 0;
  color: var(--on-accent);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

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

.promo-block .btn-primary {
  border-color: var(--panel);
  background: var(--panel);
  color: var(--accent-dark);
  box-shadow: var(--shade-sm);
}

.promo-block .btn-primary:hover {
  background: var(--canvas);
}

.promo-block .btn-line {
  border-color: var(--on-accent);
  background: var(--clear);
  color: var(--on-accent);
}

#related-posts {
  padding-block: 1.5rem 1rem;
}

.blog-end-heading {
  margin-block: 0 1.25rem;
  font-size: var(--blog-h2);
}

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

.related-card {
  padding: 1.25rem;
}

.related-card h3 {
  margin-block: 1rem 0.75rem;
  font-size: var(--blog-h3);
}

.related-card > p {
  margin-block-end: 0;
  font-size: var(--blog-small);
}

#post-nav {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-block: 1.5rem 2rem;
}

.post-nav-card {
  display: block;
  padding: 1.25rem;
  color: var(--text);
  text-decoration: none;
}

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

.post-nav-label,
.post-nav-title {
  display: block;
}

.post-nav-label {
  margin-block-end: 0.6rem;
  color: var(--accent-dark);
  font-size: var(--blog-small);
}

.post-nav-title {
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
  overflow-wrap: anywhere;
}

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

.float-cta {
  position: fixed;
  inset-inline-end: 1.5rem;
  inset-block-end: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 40;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  max-width: calc(100vw - 3rem);
  min-height: 3rem;
  padding: 0.8rem 1.2rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--blog-pill-radius);
  background: var(--accent-dark);
  color: var(--on-accent);
  box-shadow: var(--shade-cta);
  font-family: var(--f-body);
  font-size: var(--blog-small);
  font-weight: var(--weight-bold);
  text-decoration: none;
  transition: transform var(--blog-transition), background var(--blog-transition);
}

.float-cta svg {
  flex: 0 0 auto;
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: currentColor;
}

.float-cta:hover {
  background: var(--accent);
  transform: var(--blog-lift);
}

body:has(.float-cta) {
  padding-block-end: calc(5rem + env(safe-area-inset-bottom));
}

@media (max-width: 860px) {
  .article-content table,
  [data-blog-body] table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

  .article-content .table-scroll table,
  [data-blog-body] .table-scroll table {
    display: table;
    max-width: none;
  }

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

@media (max-width: 640px) {
  .no-break {
    white-space: normal;
  }

  .blog-index {
    padding-block-start: 1.5rem;
  }

  .blog-card-grid,
  #post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav-next {
    grid-column: auto;
  }

  .article-body {
    padding: 1.25rem;
  }

  .article-hero {
    width: calc(100% - 1rem);
  }

  .promo-block {
    gap: 1.25rem;
  }

  .promo-actions {
    width: 100%;
  }

  .promo-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }

  .float-cta {
    inset-inline-end: 1rem;
    inset-block-end: max(0.75rem, env(safe-area-inset-bottom));
    max-width: calc(100vw - 2rem);
  }
}

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

  .article-card:hover,
  .article-card:focus-within,
  .related-card:hover,
  .related-card:focus-within,
  .post-nav-card:hover,
  .float-cta:hover {
    transform: none;
  }
}