:root {
  --blog-column: 56rem;
  --blog-body-size: 1rem;
  --blog-body-leading: 1.85;
  --blog-title-size: clamp(1.8rem, 4vw, 2.6rem);
  --blog-list-title-size: clamp(2rem, 5vw, 3rem);
  --blog-h2-size: clamp(1.25rem, 3vw, 1.6rem);
  --blog-h3-size: clamp(1.1rem, 2.5vw, 1.3rem);
  --blog-small-size: 0.85rem;
  --blog-title-leading: 1.4;
  --blog-title-tracking: 0em;
  --blog-kicker-tracking: 0.12em;
  --blog-weight-normal: 400;
  --blog-weight-strong: 600;
  --blog-line: 1px solid var(--border);
  --blog-focus: 2px solid var(--text);
  --blog-paper-tint: color-mix(in srgb, var(--peach) 28%, var(--bg));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 12%, var(--bg-panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 10%, var(--bg-panel));
  --blog-note-tint: color-mix(in srgb, var(--accent) 6%, var(--bg-panel));
  --blog-rule: color-mix(in srgb, var(--accent) 45%, var(--border));
  --blog-promo-start: color-mix(in srgb, var(--text) 94%, var(--accent));
  --blog-promo-end: color-mix(in srgb, var(--text) 87%, var(--accent));
  --blog-gap: 1.5rem;
  --blog-section-gap: 2.5rem;
  --blog-card-padding: clamp(1.25rem, 3vw, 1.75rem);
  --blog-hover-offset: -2px;
}

.blog-page {
  color: var(--text);
  background: linear-gradient(180deg, var(--blog-paper-tint), var(--bg) 36rem);
  font-family: var(--font-body);
}

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

.blog-page h1,
.blog-page h2,
.blog-page h3,
.article-hero h1,
.reading-wrap.prose h1,
.reading-wrap.prose h2,
.reading-wrap.prose h3,
#related-posts h2,
#related-posts h3 {
  display: block;
  text-wrap: pretty;
  letter-spacing: var(--blog-title-tracking);
  overflow-wrap: anywhere;
}

.blog-page a:focus-visible,
.blog-page button:focus-visible,
.reading-wrap a:focus-visible,
.reading-wrap summary:focus-visible {
  outline: var(--blog-focus);
  outline-offset: 4px;
}

.blog-masthead {
  padding-block: clamp(3rem, 7vw, 5rem) 2.5rem;
  text-align: center;
}

.blog-kicker,
.article-kicker,
.article-hero .kicker {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  letter-spacing: var(--blog-kicker-tracking);
  text-transform: uppercase;
}

.blog-masthead h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--blog-weight-normal);
  font-size: var(--blog-list-title-size);
  line-height: var(--blog-title-leading);
}

.blog-masthead h1::after,
.article-hero h1::after {
  content: "";
  display: block;
  width: 3.5em;
  height: 2px;
  margin: 1.25rem auto;
  border-radius: var(--r-pill);
  background: var(--blog-rule);
}

.blog-deck {
  max-width: 42rem;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.blog-catalog {
  padding-block: 0 2.5rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.625rem;
}

.blog-filters button {
  min-height: 44px;
  padding: 0.6rem 1rem;
  border: var(--blog-line);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: inherit;
  cursor: pointer;
  transition: border-color var(--duration) var(--ease), background var(--duration) var(--ease);
}

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

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

.blog-status {
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  text-align: center;
}

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: var(--blog-card-padding);
  border: var(--blog-line);
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  box-shadow: var(--shadow-rose-sm);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.article-card:hover {
  border-color: var(--text-muted);
  transform: translateY(var(--blog-hover-offset));
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.article-meta time {
  font-family: var(--font-mono);
}

.article-meta .tag {
  max-width: 100%;
  padding: 0.2rem 0.65rem;
  border: var(--blog-line);
  border-radius: var(--r-pill);
  background: var(--bg-panel-2);
  color: var(--text);
  white-space: normal;
  overflow-wrap: anywhere;
}

.article-card h2,
.article-card h3 {
  margin: 1rem 0 0.75rem;
  font-family: var(--font-body);
  font-weight: var(--blog-weight-strong);
  font-size: var(--blog-h3-size);
  line-height: 1.65;
}

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

.article-card h2 a:hover,
.article-card h3 a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.article-card p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.article-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--text);
  font-size: var(--blog-small-size);
  font-weight: var(--blog-weight-strong);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem;
  border: var(--blog-line);
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  color: var(--text-muted);
  line-height: var(--blog-body-leading);
  text-align: center;
}

/* 同一盒宽与内衬用于刊头、面包屑和正文。 */
.reading-wrap,
.article-hero,
.breadcrumbs,
.breadcrumb,
.blog-breadcrumbs {
  width: 100%;
  max-width: calc(var(--blog-column) + var(--gutter) + var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-width: 0;
}

.reading-wrap {
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.breadcrumbs,
.breadcrumb,
.blog-breadcrumbs {
  margin-top: 1.5rem;
  padding-top: 0.25rem;
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.breadcrumbs ol,
.breadcrumb ol,
.blog-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.breadcrumbs li + li::before,
.breadcrumb li + li::before,
.blog-breadcrumbs li + li::before {
  content: "／";
  margin-right: 0.5rem;
  color: var(--text-muted);
}

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

.article-hero {
  padding-block: 2.5rem 1.75rem;
  border: none;
  border-radius: var(--r-small);
  background: none;
  box-shadow: none;
  text-align: center;
}

.article-hero h1 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-title-size);
  font-weight: var(--blog-weight-normal);
  line-height: var(--blog-title-leading);
}

.article-hero .article-summary,
.article-hero .summary,
.article-hero .blog-deck,
.article-hero > p:not(.kicker):not(.article-kicker):not(.blog-kicker):not(.article-meta) {
  max-width: 46rem;
  margin: 0 auto 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.article-hero .article-meta {
  justify-content: center;
  margin: 1rem 0 0;
}

.article-hero .article-meta > * + *::before {
  content: "·";
  margin-right: 0.75rem;
  color: var(--text-muted);
}

.article-hero .article-meta .tag {
  padding: 0;
  border: none;
  background: none;
}

.reading-wrap.prose {
  counter-reset: blog-section;
  padding-block: 0 1.5rem;
  color: var(--text);
}

.reading-wrap.prose p {
  margin: 0 0 1.25rem;
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.reading-wrap.prose h2 {
  counter-increment: blog-section;
  margin: var(--blog-section-gap) 0 1rem;
  font-family: var(--font-body);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-strong);
  line-height: 1.65;
  scroll-margin-top: var(--anchor-offset);
}

.reading-wrap.prose > h2:first-child,
.reading-wrap.prose > section:first-child > h2:first-child {
  margin-top: 0.75rem;
}

.reading-wrap.prose h2::before {
  content: counter(blog-section, decimal-leading-zero);
  display: inline-block;
  margin-right: 0.7rem;
  padding: 0.05rem 0.45rem;
  border: var(--blog-line);
  border-radius: var(--r-small);
  background: var(--bg-panel-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  vertical-align: middle;
}

.reading-wrap.prose h3 {
  margin: 1.75rem 0 0.75rem;
  font-family: var(--font-body);
  font-size: var(--blog-h3-size);
  font-weight: var(--blog-weight-strong);
  line-height: 1.65;
}

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

.reading-wrap.prose li {
  margin-bottom: 0.5rem;
  line-height: var(--blog-body-leading);
}

.reading-wrap.prose a:not(.btn):not(.article-link):not(.post-nav-card) {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.reading-wrap.prose img,
.reading-wrap.prose svg {
  max-width: 100%;
}

.reading-wrap.prose blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--border);
  border-radius: var(--r-small);
  background: var(--bg-panel-2);
  color: var(--text-muted);
}

.reading-wrap.prose code {
  padding: 0.15em 0.35em;
  border-radius: var(--r-small);
  background: var(--bg-panel-2);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  overflow-wrap: anywhere;
}

.reading-wrap.prose pre {
  position: relative;
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 3rem 1.5rem 1.5rem;
  border: 1px solid var(--capsule-edge);
  border-radius: var(--r-card);
  background: var(--text);
  color: var(--white);
  overflow-x: auto;
  box-shadow: var(--shadow-ink);
}

.reading-wrap.prose pre::before {
  content: "VPNYW / NOTES";
  position: absolute;
  top: 0.8rem;
  left: 1.5rem;
  color: var(--on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  letter-spacing: var(--blog-kicker-tracking);
}

.reading-wrap.prose pre code {
  padding: 0;
  background: none;
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

.reading-wrap.prose .table-scroll {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  border: var(--blog-line);
  border-radius: var(--r-row);
}

.reading-wrap.prose table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

.reading-wrap.prose .table-scroll table {
  margin: 0;
}

.reading-wrap.prose caption {
  padding: 0.75rem;
  color: var(--text-muted);
  text-align: left;
}

.reading-wrap.prose th,
.reading-wrap.prose td {
  padding: 0.85rem 1rem;
  border-bottom: var(--blog-line);
  text-align: left;
  vertical-align: top;
}

.reading-wrap.prose thead th {
  background: var(--text);
  color: var(--white);
  font-weight: var(--blog-weight-strong);
  word-break: keep-all;
}

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

.reading-wrap.prose tbody tr:nth-child(odd) {
  background: var(--bg-panel);
}

.reading-wrap.prose tbody tr:nth-child(even) {
  background: var(--bg-panel-2);
}

.reading-wrap.prose tbody tr:hover {
  background: var(--blog-paper-tint);
}

.callout,
.reading-wrap.prose .callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem 1.25rem 3.5rem;
  border: var(--blog-line);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-row);
  background: var(--blog-note-tint);
  color: var(--text);
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.3rem;
  left: 1rem;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid currentColor;
  border-radius: var(--r-round);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  line-height: 1.5rem;
  text-align: center;
}

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

.callout.warning::before,
.callout--warning::before,
.callout.is-warning::before {
  content: "!";
}

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

.callout > :last-child,
.reading-wrap.prose .callout > :last-child,
.reading-wrap.prose .verdict > :last-child {
  margin-bottom: 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stat-card {
  min-width: 0;
  padding: 1.5rem;
  border: var(--blog-line);
  border-top: 3px solid var(--border);
  border-radius: var(--r-card);
  background: var(--bg-panel);
}

.stat-card:nth-child(even) {
  border-top-color: var(--blog-rule);
  background: var(--blog-paper-tint);
}

.stat-num {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-strong);
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.stat-label {
  display: block;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

.check-list,
.reading-wrap.prose .check-list {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.reading-wrap.prose .check-list li {
  min-width: 0;
  margin: 0;
  padding: 1rem 1.25rem;
  border: var(--blog-line);
  border-radius: var(--r-row);
  background: var(--bg-panel);
  list-style: none;
}

.verdict {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--r-row);
  background: var(--blog-note-tint);
  color: var(--text);
}

.verdict strong:first-child {
  font-weight: var(--blog-weight-strong);
}

.promo-block,
.reading-wrap.prose .promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: clamp(1.5rem, 4vw, 2rem);
  border: 1px solid var(--capsule-edge);
  border-radius: var(--r-panel);
  background: linear-gradient(130deg, var(--blog-promo-start), var(--blog-promo-end));
  color: var(--white);
  box-shadow: var(--shadow-rose);
}

.promo-block::before {
  content: "";
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  bottom: 0.6rem;
  left: 0.6rem;
  border: 1px solid var(--capsule-edge);
  border-radius: var(--r-card);
  pointer-events: none;
}

.promo-copy {
  flex: 1 1 20rem;
  min-width: 0;
}

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

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

.promo-block .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.promo-block .btn-primary {
  border-color: var(--white);
  background: var(--white);
  color: var(--text);
}

.promo-block .btn-ghost {
  border-color: var(--on-dark-muted);
  background: var(--clear);
  color: var(--white);
}

.promo-block .btn-primary:hover {
  background: var(--bg-panel-2);
  color: var(--text);
}

.promo-block .btn-ghost:hover {
  background: var(--capsule);
  color: var(--white);
}

.blog-list-promo.reading-wrap {
  width: calc(100% - var(--gutter) - var(--gutter));
  max-width: var(--blog-column);
  margin: 0 auto 2.5rem;
}

#related-posts,
#post-nav {
  min-width: 0;
  margin-inline: auto;
}

#related-posts:empty,
#post-nav:empty {
  display: none;
}

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

#related-posts > h2,
.reading-wrap.prose #related-posts > h2 {
  margin: 0 0 1.25rem;
  font-size: var(--blog-h2-size);
  line-height: 1.6;
}

.reading-wrap.prose #related-posts > h2::before {
  content: none;
}

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

#related-posts .article-card {
  padding: 1.25rem;
}

#related-posts .article-card h3 {
  margin: 0.75rem 0;
  font-size: var(--blog-h3-size);
}

#related-posts .article-card p {
  color: var(--text-muted);
  font-size: var(--blog-small-size);
}

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

.post-nav-card {
  display: block;
  min-width: 0;
  padding: 1.5rem;
  border: var(--blog-line);
  border-radius: var(--r-card);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

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

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

.post-nav-label {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
}

.post-nav-card strong {
  display: block;
  margin-bottom: 1rem;
  font-size: var(--blog-body-size);
  font-weight: var(--blog-weight-strong);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

body:has(.float-cta)::after {
  content: "";
  display: block;
  height: 6rem;
}

@media (max-width: 860px) {
  .related-grid {
    grid-template-columns: 1fr;
  }

  .reading-wrap.prose table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

  .reading-wrap.prose .table-scroll table {
    display: table;
    width: 100%;
    min-width: 38rem;
    max-width: none;
  }
}

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

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

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

  .blog-masthead {
    padding-top: 2.5rem;
  }

  .article-hero {
    padding-block: 2rem 1.25rem;
  }

  .article-hero .article-meta {
    gap: 0.5rem;
  }

  .article-hero .article-meta > * + *::before {
    margin-right: 0.5rem;
  }

  .promo-block .cta-row {
    width: 100%;
  }

  .callout,
  .reading-wrap.prose .callout {
    padding-right: 1rem;
  }
}

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

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