:root {
  --blog-reading-width: 56rem;
  --blog-gutter: clamp(1.5rem, 4vw, 2.5rem);
  --blog-list-title: clamp(2rem, 4.5vw, 3rem);
  --blog-article-title: clamp(1.9rem, 3.6vw, 2.6rem);
  --blog-section-title: clamp(1.3rem, 2.4vw, 1.6rem);
  --blog-card-title: 1.25rem;
  --blog-subtitle: 1.3rem;
  --blog-body-size: 1rem;
  --blog-small-size: 0.875rem;
  --blog-stat-size: clamp(1.5rem, 3vw, 2rem);
  --blog-brand-size: 1.5rem;
  --blog-body-leading: 1.85;
  --blog-title-leading: 1.4;
  --blog-title-tracking: -0.015em;
}

.blog-index,
.blog-article {
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-body);
}

.blog-index *,
.blog-article *,
.reading-wrap *,
.article-hero *,
#related-posts *,
#post-nav * {
  box-sizing: border-box;
}

.blog-list-hero h1,
.article-hero h1,
.article-card h2,
.article-card h3,
.prose h2,
.prose h3,
.article-body h2,
.article-body h3,
[data-article-body] h2,
[data-article-body] h3,
.related-heading {
  display: block;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  letter-spacing: var(--blog-title-tracking);
  line-height: var(--blog-title-leading);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.blog-skip-link {
  position: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  padding: 0.8rem 1rem;
  transform: translateY(-200%);
  background: var(--text);
  color: var(--bg);
  font-size: var(--blog-body-size);
}

.blog-skip-link:focus {
  transform: translateY(0);
}

.blog-index :focus-visible,
.blog-article :focus-visible,
#related-posts :focus-visible,
#post-nav :focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.blog-list-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(3rem, 7vw, 5rem) 2.5rem;
}

.blog-list-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 2rem;
  right: var(--gutter);
  width: 42%;
  height: 65%;
  background: color-mix(in srgb, var(--accent) 8%, var(--bg));
  border-radius: var(--radius-0);
  pointer-events: none;
}

.blog-eyebrow {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
}

.blog-list-hero h1 {
  margin: 0;
  font-size: var(--blog-list-title);
}

.blog-hero-summary {
  max-width: 42rem;
  margin: 1.25rem 0 0;
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  color: var(--text-muted);
}

.blog-directory {
  padding-block: 1rem 2rem;
}

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  padding-block: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.blog-filter button {
  min-height: 2.75rem;
  padding: 0.5rem 0.1rem;
  border: 0;
  border-bottom: 2px solid var(--border);
  border-radius: var(--radius-0);
  background: var(--bg);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  font-weight: var(--weight-regular);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.blog-filter button:hover,
.blog-filter button[aria-pressed="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.blog-status {
  margin-block: 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: var(--blog-body-leading);
}

.blog-card-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--radius-0);
  background: var(--bg-panel);
  box-shadow: inset 0 1px 0 var(--edge-hi);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.article-card:hover,
.article-card:focus-within {
  border-top-color: var(--accent);
  transform: translateY(-3px);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  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-label {
  display: inline-block;
  max-width: 100%;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-0);
  color: var(--text);
  background: var(--bg-panel-2);
  font-family: var(--font-body);
  font-size: var(--blog-small-size);
  white-space: normal;
}

.article-card h2,
.article-card h3 {
  margin: 1rem 0 0.75rem;
  font-size: var(--blog-card-title);
}

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

.article-card h2 a:hover,
.article-card h3 a:hover {
  color: var(--accent);
}

.article-summary {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  overflow-wrap: anywhere;
}

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

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

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

.blog-promo-wrap {
  padding-block: 1rem 3rem;
}

.reading-wrap,
.article-hero,
.breadcrumb,
.breadcrumbs {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-reading-width) + var(--blog-gutter) + var(--blog-gutter));
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.breadcrumb,
.breadcrumbs {
  margin-top: 1.5rem;
  padding-block: 0.5rem 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: var(--blog-body-leading);
  overflow-wrap: anywhere;
}

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

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

.article-hero {
  position: relative;
  isolation: isolate;
  padding-block: 2.25rem 2rem;
  border-radius: var(--radius-canvas);
  background: var(--bg-panel);
}

.article-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset-block-start: 1rem;
  inset-inline-start: 1rem;
  width: 73%;
  height: calc(100% - 2rem);
  border-top: 1px solid var(--edge-hi);
  border-radius: var(--radius-0);
  background: color-mix(in srgb, var(--accent) 9%, var(--bg));
  box-shadow: 0 1rem 3rem var(--shadow-tint);
  pointer-events: none;
}

.article-hero h1 {
  margin: 1.25rem 0;
  font-size: var(--blog-article-title);
}

.article-hero .article-meta,
.article-hero .article-summary,
.article-hero .article-deck {
  margin-inline-start: 1rem;
}

.article-hero .article-meta time,
.article-hero .article-readtime,
.article-hero .read-time,
.article-hero .reading-time {
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg);
  color: var(--text-muted);
  font-size: var(--blog-small-size);
}

.article-hero .tag-label {
  padding: 0.25rem 0.6rem;
  background: var(--text);
  color: var(--bg);
}

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

.reading-wrap {
  padding-block: 1.75rem 0;
}

.prose,
.article-body,
[data-article-body] {
  min-width: 0;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  overflow-wrap: anywhere;
}

.prose > :first-child,
.article-body > :first-child,
[data-article-body] > :first-child {
  margin-top: 0;
}

:is(.prose, .article-body, [data-article-body]) h2 {
  margin-block: 2.5rem 1rem;
  font-size: var(--blog-section-title);
  scroll-margin-top: var(--anchor-offset);
}

:is(.prose, .article-body, [data-article-body]) h2::before {
  content: "";
  display: inline-block;
  width: 1.25rem;
  height: 0.2rem;
  margin-inline-end: 0.65rem;
  vertical-align: middle;
  background: var(--accent);
}

:is(.prose, .article-body, [data-article-body]) h3 {
  margin-block: 1.75rem 0.75rem;
  font-size: var(--blog-subtitle);
}

:is(.prose, .article-body, [data-article-body]) p {
  margin-block: 0 1.2rem;
}

:is(.prose, .article-body, [data-article-body]) ul,
:is(.prose, .article-body, [data-article-body]) ol {
  margin-block: 1rem 1.5rem;
  padding-inline-start: 1.5rem;
}

:is(.prose, .article-body, [data-article-body]) li {
  margin-block: 0.5rem;
}

:is(.prose, .article-body, [data-article-body]) a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

:is(.prose, .article-body, [data-article-body]) strong {
  font-weight: var(--weight-medium);
}

:is(.prose, .article-body, [data-article-body]) img,
:is(.prose, .article-body, [data-article-body]) svg {
  max-width: 100%;
  height: auto;
}

:is(.prose, .article-body, [data-article-body]) blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-inline-start: 3px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
}

:is(.prose, .article-body, [data-article-body]) code {
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-0);
  background: var(--bg-panel-2);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  overflow-wrap: anywhere;
}

:is(.prose, .article-body, [data-article-body]) pre {
  position: relative;
  max-width: 100%;
  margin-block: 1.5rem;
  padding: 3rem 1.25rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--text-muted);
  border-radius: var(--radius-canvas);
  background: var(--text);
  color: var(--bg-panel);
  line-height: 1.8;
}

:is(.prose, .article-body, [data-article-body]) pre::before {
  content: "VPNUrban / 配置参考";
  position: absolute;
  top: 0.75rem;
  left: 1.25rem;
  color: var(--bg-panel-2);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
}

:is(.prose, .article-body, [data-article-body]) pre code {
  padding: 0;
  background: var(--text);
  color: var(--bg-panel);
  white-space: pre;
  overflow-wrap: normal;
}

:is(.prose, .article-body, [data-article-body]) .table-scroll {
  max-width: 100%;
  margin-block: 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border);
}

:is(.prose, .article-body, [data-article-body]) table {
  width: 100%;
  margin-block: 1.5rem;
  border-collapse: collapse;
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

:is(.prose, .article-body, [data-article-body]) .table-scroll table {
  margin: 0;
}

:is(.prose, .article-body, [data-article-body]) th,
:is(.prose, .article-body, [data-article-body]) td {
  min-width: 9rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  text-align: start;
  vertical-align: top;
}

:is(.prose, .article-body, [data-article-body]) thead th {
  background: var(--text);
  color: var(--bg);
  font-weight: var(--weight-medium);
}

:is(.prose, .article-body, [data-article-body]) tbody tr:nth-child(even) {
  background: var(--bg-panel);
}

:is(.prose, .article-body, [data-article-body]) tbody tr:hover {
  background: var(--bg-panel-2);
}

.callout,
.verdict {
  position: relative;
  margin-block: 1.5rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--accent);
  border-radius: var(--radius-0);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
  color: var(--text);
}

.callout {
  padding-inline-start: 3.5rem;
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.25rem;
  left: 1rem;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-dot);
  color: var(--text);
  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-inline-start-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 10%, var(--bg));
}

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

.callout.success,
.callout--success,
.callout.is-success {
  border-inline-start-color: var(--success);
  background: color-mix(in srgb, var(--success) 8%, var(--bg));
}

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

.verdict > strong:first-child {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: var(--weight-medium);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-block: 1.5rem;
}

.stat-card {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--text);
  border-radius: var(--radius-0);
  background: var(--bg-panel);
  box-shadow: inset 0 1px 0 var(--edge-hi);
}

.stat-card:nth-child(even) {
  border-top-color: var(--text-muted);
  background: var(--bg-panel-2);
}

.stat-num {
  display: block;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--blog-stat-size);
  line-height: var(--blog-title-leading);
}

.stat-label {
  display: block;
  margin-top: 0.6rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: var(--blog-body-leading);
}

:is(.prose, .article-body, [data-article-body]) .check-list,
.check-list {
  margin-block: 1.5rem;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin-block: 0.65rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  list-style: none;
}

.promo-block {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2rem 1.5rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-canvas);
  background: var(--bg-panel);
  box-shadow: 0 1rem 3rem var(--shadow-tint), inset 0 1px 0 var(--edge-hi);
  color: var(--text);
}

.promo-block::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0.75rem;
  right: 0.75rem;
  width: 32%;
  height: calc(100% - 1.5rem);
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  pointer-events: none;
}

.promo-brand {
  font-family: var(--font-display);
  font-size: var(--blog-brand-size);
  font-weight: var(--weight-medium);
}

.promo-block p {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  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 {
  border-radius: var(--radius-0);
}

.promo-block .btn-primary {
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--bg);
}

.promo-block .btn-secondary {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

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

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

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

.related-heading {
  margin: 0 0 1.25rem;
  font-size: var(--blog-section-title);
}

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

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

.post-nav-card {
  display: block;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--radius-0);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.post-nav-card:hover,
.post-nav-card:focus-visible {
  transform: translateY(-3px);
  border-top-color: var(--accent);
}

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

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

.post-nav-title {
  display: block;
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-size: var(--blog-body-size);
  font-weight: var(--weight-medium);
  line-height: var(--blog-body-leading);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

@media (max-width: 1000px) {
  .blog-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

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

  .blog-list-hero::before {
    width: 60%;
  }

  .blog-filter {
    gap: 0.5rem 1rem;
  }

  .article-card,
  .promo-block {
    padding: 1.25rem;
  }

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

  .article-hero .article-meta,
  .article-hero .article-summary,
  .article-hero .article-deck {
    margin-inline-start: 0.5rem;
  }

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

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

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

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