:root {
  --blog-reading: 56rem;
  --blog-gutter: max(1.5rem, var(--gutter));
  --blog-font-size: 1rem;
  --blog-line-height: 1.9;
  --blog-heading-weight: 800;
  --blog-title-tracking: -0.015em;
  --blog-hero-radius: var(--r-xl);
  --blog-stamp-size: 5.5rem;
  --blog-stamp-turn: -11deg;
  --blog-tint-accent: color-mix(in srgb, var(--accent) 7%, var(--bg-panel));
  --blog-tint-success: color-mix(in srgb, var(--success) 9%, var(--bg-panel));
  --blog-tint-warn: color-mix(in srgb, var(--warn) 10%, var(--bg-panel));
  --blog-focus: color-mix(in srgb, var(--accent) 70%, var(--text));
  --blog-transition: 180ms var(--ease);
}

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

.blog-index,
.reading-wrap,
.article-hero,
.breadcrumbs,
#related-posts,
#post-nav {
  box-sizing: border-box;
  min-width: 0;
}

.blog-index {
  padding-bottom: 3rem;
}

.blog-skip {
  position: fixed;
  inset-block-start: 1rem;
  inset-inline-start: 1rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  color: var(--on-dark);
  background: var(--text);
  border-radius: var(--r-sm);
  transform: translateY(-200%);
}

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

.blog-index a:focus-visible,
.blog-filter button:focus-visible,
.reading-wrap a:focus-visible,
.article-hero a:focus-visible,
.breadcrumbs a:focus-visible,
#related-posts a:focus-visible,
#post-nav a:focus-visible,
.float-cta:focus-visible {
  outline: 3px solid var(--blog-focus);
  outline-offset: 4px;
}

.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumbs li {
  min-width: 0;
  overflow-wrap: anywhere;
}

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

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.blog-article-page .breadcrumbs,
body:has(.article-hero) main > .breadcrumbs,
.reading-wrap,
.article-hero,
body:has(.article-hero) main > #related-posts,
body:has(.article-hero) main > #post-nav {
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) + var(--blog-gutter));
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.reading-wrap {
  padding-block: 1.5rem 2rem;
}

.blog-list-hero {
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
}

.blog-eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.blog-list-hero h1 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.3;
  font-weight: var(--blog-heading-weight);
  letter-spacing: var(--blog-title-tracking);
  text-wrap: pretty;
}

.blog-intro {
  max-width: 46rem;
  margin: 1rem 0 0;
  color: var(--text-muted);
  line-height: 1.85;
  font-size: var(--blog-font-size);
}

.blog-catalogue {
  padding-top: 2rem;
}

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.blog-filter button {
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: inherit;
  cursor: pointer;
  transition: background var(--blog-transition), border-color var(--blog-transition);
}

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

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

.blog-status {
  min-height: 1.5rem;
  margin: 1rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.blog-post-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.blog-card,
.related-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(--r-lg);
  color: var(--text);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
  opacity: 1;
  visibility: visible;
  transition: border-color var(--blog-transition), transform var(--blog-transition);
}

.blog-card:hover,
.related-card:hover,
.post-nav-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.article-meta {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.85rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.article-meta .tag {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-pill);
  background: var(--accent-dark);
  color: var(--on-dark);
}

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

.blog-card h2,
.related-card h3 {
  display: block;
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.6;
  font-weight: var(--blog-heading-weight);
  letter-spacing: var(--blog-title-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

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

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

.blog-card > p,
.related-card > p {
  margin: 0 0 1.25rem;
  font-size: var(--blog-font-size);
  line-height: 1.85;
  color: var(--text-muted);
}

.blog-read-link {
  align-self: flex-start;
  margin-top: auto;
  padding-block: 0.35rem;
  color: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
}

.blog-read-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 1.5rem;
  margin: 0;
  border: 1px dashed var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  line-height: 1.85;
  color: var(--text-muted);
}

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

.blog-index-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  background: var(--bg-panel-2);
}

.blog-index-note h2 {
  display: block;
  margin: 0 0 0.5rem;
  font-size: 1.4rem;
  text-wrap: pretty;
}

.blog-index-note p {
  max-width: 40rem;
  margin: 0;
  line-height: 1.85;
  color: var(--text-muted);
}

.article-hero {
  position: relative;
  isolation: isolate;
  padding-block: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-hero-radius);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
}

.article-hero::after {
  content: "VPNRT\A RT · 线路手记";
  position: absolute;
  top: 1.25rem;
  right: var(--blog-gutter);
  box-sizing: border-box;
  display: grid;
  place-content: center;
  width: var(--blog-stamp-size);
  height: var(--blog-stamp-size);
  border: 4px double var(--accent-dark);
  border-radius: var(--r-circle);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1.9;
  text-align: center;
  white-space: pre;
  transform: rotate(var(--blog-stamp-turn));
  pointer-events: none;
}

.article-hero .article-meta {
  min-height: var(--blog-stamp-size);
  padding-right: calc(var(--blog-stamp-size) + 1rem);
  align-content: center;
}

.article-hero .article-meta time,
.article-hero .article-meta > span:not(.tag),
.article-hero .reading-time {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  color: var(--text-muted);
  background: var(--bg-panel);
}

.article-hero h1 {
  display: block;
  position: relative;
  margin: 0.75rem 0 1rem;
  padding: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.8vw, 2.6rem);
  font-weight: var(--blog-heading-weight);
  line-height: 1.45;
  letter-spacing: var(--blog-title-tracking);
  text-align: left;
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

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

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

.prose h1,
.prose h2,
.prose h3,
.article-body h1,
.article-body h2,
.article-body h3,
[data-article-body] h1,
[data-article-body] h2,
[data-article-body] h3 {
  display: block;
  font-family: var(--font-display);
  letter-spacing: var(--blog-title-tracking);
  text-wrap: pretty;
}

:is(.prose, .article-body, [data-article-body]) h2 {
  margin: 2rem 0 0.85rem;
  color: var(--text);
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  font-weight: var(--blog-heading-weight);
  line-height: 1.6;
  scroll-margin-top: var(--toc-offset);
}

:is(.prose, .article-body, [data-article-body]) h2::before {
  content: counter(blog-section, decimal-leading-zero);
  counter-increment: blog-section;
  display: inline-block;
  margin-inline-end: 0.65rem;
  padding: 0.1rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: var(--r-mini);
  color: var(--accent-dark);
  background: var(--blog-tint-accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  vertical-align: 0.12em;
}

:is(.prose, .article-body, [data-article-body]) > h2:first-child,
:is(.prose, .article-body, [data-article-body]) > section:first-child > h2:first-child {
  margin-top: 0.5rem;
}

:is(.prose, .article-body, [data-article-body]) h3 {
  margin: 1.5rem 0 0.65rem;
  font-size: 1.25rem;
  line-height: 1.65;
  color: var(--text);
}

:is(.prose, .article-body, [data-article-body]) p {
  margin-block: 0 1.15rem;
}

:is(.prose, .article-body, [data-article-body]) :is(ul, ol) {
  padding-inline-start: 1.5rem;
  margin-block: 0.75rem 1.25rem;
}

:is(.prose, .article-body, [data-article-body]) li + li {
  margin-top: 0.45rem;
}

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

:is(.prose, .article-body, [data-article-body]) strong {
  color: var(--text);
  font-weight: 700;
}

:is(.prose, .article-body, [data-article-body]) img,
:is(.prose, .article-body, [data-article-body]) video {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

:is(.prose, .article-body, [data-article-body]) code {
  padding: 0.15em 0.35em;
  border-radius: var(--r-mini);
  color: var(--accent-dark);
  background: var(--blog-tint-accent);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

:is(.prose, .article-body, [data-article-body]) pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  padding: 3rem 1.25rem 1.25rem;
  border: 1px solid var(--text);
  border-radius: var(--r-md);
  color: var(--on-dark);
  background: var(--text);
  line-height: 1.75;
  tab-size: 2;
}

:is(.prose, .article-body, [data-article-body]) pre::before {
  content: "VPNRT / 技术笔记";
  position: absolute;
  top: 0.75rem;
  left: 1.25rem;
  color: var(--on-dark);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
}

:is(.prose, .article-body, [data-article-body]) pre code {
  padding: 0;
  border-radius: 0;
  background: var(--clear);
  color: inherit;
  white-space: pre;
}

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

:is(.prose, .article-body, [data-article-body]) table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
  line-height: 1.8;
  background: var(--bg-panel);
}

:is(.prose, .article-body, [data-article-body]) :is(th, td) {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

:is(.prose, .article-body, [data-article-body]) thead th {
  color: var(--on-dark);
  background: var(--text);
  font-weight: 600;
}

:is(.prose, .article-body, [data-article-body]) tbody :is(th, td:first-child) {
  color: var(--text);
  font-weight: 600;
}

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

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

.callout,
.verdict,
:is(.prose, .article-body, [data-article-body]) blockquote {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-sm);
  color: var(--text);
  background: var(--blog-tint-accent);
}

.callout {
  padding-left: 3.5rem;
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.15rem;
  left: 1rem;
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid currentColor;
  border-radius: var(--r-circle);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.5rem;
  text-align: center;
}

:is(.prose, .article-body, [data-article-body]) blockquote.callout {
  padding-left: 3.5rem;
}

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

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

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

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

:is(.callout, .verdict, blockquote) > :last-child {
  margin-bottom: 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 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(--accent);
  border-radius: var(--r-md);
  background: var(--blog-tint-accent);
}

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

.stat-num {
  display: block;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
  font-weight: 700;
  line-height: 1.4;
}

.stat-card:nth-child(even) .stat-num {
  color: var(--text);
}

.stat-label {
  display: block;
  margin-top: 0.45rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

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

.check-list li {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel);
}

.check-list li + li {
  margin-top: 0.6rem;
}

.promo-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-block: 2rem 1rem;
  padding: 1.75rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-xl);
  color: var(--on-dark);
  background: var(--gradient-accent);
  box-shadow: var(--shadow-panel);
}

:is(.prose, .article-body, [data-article-body]) .promo-block h2,
.promo-block h2 {
  margin: 0 0 0.6rem;
  color: var(--on-dark);
  font-size: 1.5rem;
  line-height: 1.6;
}

:is(.prose, .article-body, [data-article-body]) .promo-block h2::before,
:is(.prose, .article-body, [data-article-body]) #related-posts h2::before {
  content: none;
  counter-increment: none;
}

:is(.prose, .article-body, [data-article-body]) .promo-block p,
.promo-block p {
  margin: 0;
  color: var(--on-dark);
}

.promo-block > div:first-child {
  flex: 1 1 20rem;
}

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

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

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

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

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

#related-posts > h2 {
  display: block;
  margin: 0 0 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.6;
  letter-spacing: var(--blog-title-tracking);
  text-wrap: pretty;
}

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

.related-card {
  padding: 1.1rem;
}

.related-card h3 {
  font-size: 1.1rem;
}

.related-card > p {
  font-size: 0.9rem;
}

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

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

.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(--r-md);
  color: var(--text);
  background: var(--bg-panel);
  text-decoration: none;
  transition: border-color var(--blog-transition), transform var(--blog-transition);
}

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

.post-nav-card strong {
  display: block;
  margin: 0.5rem 0;
  color: var(--text);
  font-size: var(--blog-font-size);
  line-height: 1.8;
}

.post-nav-label {
  color: var(--accent-dark);
  font-size: 0.85rem;
  font-weight: 600;
}

.post-nav-card time {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.float-cta {
  position: fixed;
  right: max(1.25rem, env(safe-area-inset-right));
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  max-width: calc(100vw - 2.5rem);
  min-height: 3rem;
  padding: 0.8rem 1.25rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-pill);
  color: var(--on-dark);
  background: var(--accent-dark);
  box-shadow: var(--shadow-float);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
}

.float-cta svg {
  flex: 0 0 auto;
  width: 1.2rem;
  height: 1.2rem;
  fill: none;
  stroke: currentColor;
}

.float-cta:hover {
  background: var(--text);
  border-color: var(--text);
}

body:has(.float-cta) {
  padding-bottom: 5.5rem;
}

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

  :is(.prose, .article-body, [data-article-body]) table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
  }

  :is(.prose, .article-body, [data-article-body]) .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-list-hero {
    padding: 1.5rem;
  }

  .blog-list-hero h1 {
    font-size: clamp(1.8rem, 7vw, 2.5rem);
  }

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

  .article-hero::after {
    width: 4.5rem;
    height: 4.5rem;
    font-size: 0.58rem;
    top: 1.25rem;
  }

  .article-hero .article-meta {
    min-height: 4.75rem;
    padding-right: 5.25rem;
    gap: 0.4rem;
  }

  .article-hero h1 {
    font-size: clamp(1.65rem, 6.5vw, 2.2rem);
  }

  .promo-block {
    padding: 1.5rem;
  }

  .promo-block > div:first-child {
    flex-basis: 100%;
  }

  .float-cta {
    right: max(1rem, env(safe-area-inset-right));
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    padding: 0.65rem 1rem;
    min-height: 2.75rem;
    font-size: 0.875rem;
  }
}

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

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