:root {
  --blog-reading: 56rem;
  --blog-gutter: var(--gutter, 1.5rem);
  --blog-text-size: 1rem;
  --blog-leading: 1.85;
  --blog-title-size: clamp(1.8rem, 3.6vw, 2.6rem);
  --blog-list-title-size: clamp(2rem, 4vw, 3rem);
  --blog-h2-size: clamp(1.3rem, 2.4vw, 1.6rem);
  --blog-h3-size: clamp(1.1rem, 2vw, 1.3rem);
  --blog-small-size: 0.85rem;
  --blog-card-title-size: 1.2rem;
  --blog-tracking: -0.015em;
  --blog-card-gap: 1.25rem;
  --blog-focus-width: 3px;
}

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

.blog-skip {
  position: absolute;
  top: 0.5rem;
  left: 1rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  border-radius: var(--r);
  background: var(--panel);
  color: var(--accent-dark);
  transform: translateY(-200%);
}

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

.blog-page :where(a, button):focus-visible,
.reading-wrap :where(a, button, summary, [tabindex]):focus-visible {
  outline: var(--blog-focus-width) solid var(--accent);
  outline-offset: 4px;
}

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

.breadcrumbs {
  padding-top: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--ink-muted);
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

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

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

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

.breadcrumbs a {
  color: inherit;
  text-underline-offset: 0.2em;
}

.blog-hero,
.article-hero {
  box-sizing: border-box;
  margin-inline: auto;
  color: var(--ink);
  text-align: center;
  background: none;
  border: 0;
  box-shadow: none;
}

.blog-hero {
  padding: 2.5rem 1.5rem 3rem;
}

.blog-kicker,
.article-kicker,
.article-hero .kicker {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.blog-hero h1,
.article-hero h1,
.article-card :is(h2, h3),
.prose :is(h1, h2, h3),
.article-body :is(h1, h2, h3),
.post-content :is(h1, h2, h3),
.blog-content :is(h1, h2, h3) {
  display: block;
  text-wrap: pretty;
  letter-spacing: var(--blog-tracking);
  overflow-wrap: anywhere;
  font-family: var(--font-display);
}

.blog-hero h1 {
  margin: 0;
  font-size: var(--blog-list-title-size);
  line-height: 1.3;
  font-weight: 700;
}

.blog-hero h1::after,
.article-hero h1::after {
  content: "";
  display: block;
  width: 3.5rem;
  height: 3px;
  margin: 1.5rem auto;
  border-radius: var(--r-round);
  background: var(--accent);
}

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

.blog-facts {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.blog-facts span {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
}

.blog-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel-2);
}

.blog-filters button {
  min-height: 44px;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--clear);
  border-radius: var(--r);
  background: var(--clear);
  color: var(--ink-muted);
  font-family: var(--font-body);
  font-size: var(--blog-small-size);
  cursor: pointer;
  transition: background var(--ease-time), color var(--ease-time);
}

.blog-filters button:hover {
  background: var(--panel);
  color: var(--ink);
}

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

.blog-status {
  min-height: 1.8em;
  margin: 1.25rem 0 0.75rem;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
}

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
  box-shadow: var(--shadow-card);
  color: var(--ink);
  transition: border-color var(--ease-time), transform var(--ease-time);
}

.article-card:hover,
.article-card:focus-within {
  border-top-color: var(--accent);
  transform: translateY(-2px);
}

.article-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.8rem;
  color: var(--ink-muted);
  font-size: var(--blog-small-size);
}

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

.article-card .tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--r-xs);
  background: var(--accent-a10);
  color: var(--accent-dark);
  font-size: var(--blog-small-size);
}

.article-card :is(h2, h3) {
  margin: 1rem 0 0.65rem;
  font-size: var(--blog-card-title-size);
  line-height: 1.65;
}

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

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

.article-card p {
  margin: 0 0 1.25rem;
  color: var(--ink-muted);
  font-size: var(--blog-text-size);
  line-height: 1.8;
}

.article-card__read {
  align-self: flex-start;
  margin-top: auto;
  padding-block: 0.3rem;
  color: var(--accent-dark);
  font-size: var(--blog-small-size);
  font-weight: 700;
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 2rem 1.5rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--ink-muted);
  line-height: var(--blog-leading);
}

/* 面包屑、刊头、正文与文末组件使用相同的外盒和内衬。 */
.reading-wrap,
.article-hero,
.article-breadcrumbs,
.breadcrumbs.reading-wrap {
  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);
}

.article-hero {
  padding-block: 1.75rem 2rem;
}

.article-hero h1 {
  max-width: none;
  margin: 0;
  color: var(--ink);
  font-size: var(--blog-title-size);
  font-weight: 700;
  line-height: 1.45;
}

.article-hero :is(.article-summary, .article-hero__summary, .summary) {
  max-width: 48rem;
  margin: 0.5rem auto 1.25rem;
  color: var(--ink-muted);
  font-size: var(--blog-text-size);
  line-height: var(--blog-leading);
  text-align: center;
}

.article-hero :is(.article-meta, .article-hero__meta, .post-meta) {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0 0;
  color: var(--ink-muted);
  font-size: var(--blog-small-size);
  line-height: 1.7;
}

.article-hero :is(.article-meta, .article-hero__meta, .post-meta) > * + *::before {
  content: "·";
  margin-inline: 0.1rem 0.55rem;
  color: var(--ink-muted);
}

.article-hero :is(.article-meta, .article-hero__meta, .post-meta) .tag {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: var(--accent-dark);
}

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

:where(.prose, .article-body, .post-content, .blog-content) > :first-child {
  margin-top: 0;
}

:where(.prose, .article-body, .post-content, .blog-content) h2 {
  position: relative;
  margin: 2.5rem 0 1rem;
  padding-top: 0.85rem;
  font-size: var(--blog-h2-size);
  line-height: 1.55;
  scroll-margin-top: var(--anchor-offset);
}

:where(.prose, .article-body, .post-content, .blog-content) h2::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 2rem;
  height: 3px;
  border-radius: var(--r-round);
  background: var(--accent);
}

:where(.prose, .article-body, .post-content, .blog-content) h3 {
  margin: 1.75rem 0 0.7rem;
  font-size: var(--blog-h3-size);
  line-height: 1.65;
}

:where(.prose, .article-body, .post-content, .blog-content) p {
  margin: 0 0 1.2rem;
}

:where(.prose, .article-body, .post-content, .blog-content) :is(ul, ol) {
  margin: 0 0 1.4rem;
  padding-left: 1.5rem;
}

:where(.prose, .article-body, .post-content, .blog-content) li + li {
  margin-top: 0.45rem;
}

:where(.prose, .article-body, .post-content, .blog-content) a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
}

:where(.prose, .article-body, .post-content, .blog-content) strong {
  color: var(--ink);
  font-weight: 700;
}

:where(.prose, .article-body, .post-content, .blog-content) hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

:where(.prose, .article-body, .post-content, .blog-content) blockquote {
  margin: 1.5rem 0;
  padding: 1.2rem 1.5rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--r-xs);
  background: var(--panel-2);
  color: var(--ink-muted);
}

:where(.prose, .article-body, .post-content, .blog-content) blockquote p:last-child {
  margin-bottom: 0;
}

:where(.prose, .article-body, .post-content, .blog-content) :not(pre) > code {
  padding: 0.15rem 0.35rem;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  background: var(--panel-2);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

:where(.prose, .article-body, .post-content, .blog-content) pre {
  position: relative;
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 3rem 1.25rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--night);
  border-radius: var(--r-lg);
  background: var(--night);
  color: var(--on-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  line-height: 1.8;
  white-space: pre;
}

:where(.prose, .article-body, .post-content, .blog-content) pre::before {
  content: "VPNCAB / CONFIG";
  position: absolute;
  top: 0.75rem;
  left: 1.25rem;
  color: var(--on-dark-muted);
  font-size: var(--blog-small-size);
  letter-spacing: 0.05em;
}

:where(.prose, .article-body, .post-content, .blog-content) pre code {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
}

:where(.prose, .article-body, .post-content, .blog-content) .table-scroll {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r);
}

:where(.prose, .article-body, .post-content, .blog-content) table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  background: var(--panel);
  color: var(--ink);
  font-size: var(--blog-small-size);
  line-height: 1.75;
}

:where(.prose, .article-body, .post-content, .blog-content) .table-scroll table {
  min-width: 36rem;
  margin: 0;
}

:where(.prose, .article-body, .post-content, .blog-content) :is(th, td) {
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

:where(.prose, .article-body, .post-content, .blog-content) thead th {
  background: var(--accent-dark);
  color: var(--on-dark);
  font-weight: 700;
}

:where(.prose, .article-body, .post-content, .blog-content) tbody tr:nth-child(even) {
  background: var(--panel-2);
}

:where(.prose, .article-body, .post-content, .blog-content) tbody tr:hover {
  background: var(--accent-a10);
}

.callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.2rem 1.25rem 1.2rem 3.2rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--r);
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
  color: var(--ink);
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.25rem;
  left: 1rem;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid currentColor;
  border-radius: var(--r-round);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  font-weight: 700;
  line-height: 1.35rem;
  text-align: center;
}

.callout--warning,
.callout.warning {
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 9%, var(--panel));
}

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

.callout--success,
.callout.success {
  border-left-color: var(--success);
  background: color-mix(in srgb, var(--success) 7%, var(--panel));
}

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

.callout > :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: 1.25rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--r);
  background: var(--panel);
  box-shadow: var(--shadow-card);
}

.stat-card:nth-child(even) {
  border-top-color: var(--success);
  background: color-mix(in srgb, var(--success) 6%, var(--panel));
}

.stat-num {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.45;
}

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

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

:where(.prose, .article-body, .post-content, .blog-content) .check-list {
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  list-style: none;
}

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

.verdict {
  margin: 1.5rem 0;
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--r);
  background: var(--accent-a06);
  color: var(--ink);
}

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

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

.promo-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: 1.75rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-lg);
  background: linear-gradient(125deg, var(--accent-dark), var(--night));
  box-shadow: var(--shadow-window);
  color: var(--on-dark);
}

.promo-block strong {
  color: var(--on-dark);
  font-family: var(--font-display);
  font-size: 1.4rem;
}

.promo-block p {
  max-width: 36rem;
  margin: 0.5rem 0 0;
  color: var(--on-dark);
  font-size: var(--blog-text-size);
  line-height: 1.8;
}

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

.promo-block .btn--primary {
  border: 1px solid var(--panel);
  background: var(--panel);
  color: var(--accent-dark);
}

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

.promo-block .btn--ghost {
  border: 1px solid var(--on-dark);
  background: var(--clear);
  color: var(--on-dark);
}

.promo-block .btn--ghost:hover {
  background: var(--on-dark-a12);
}

.blog-index-promo {
  margin-top: 2rem;
}

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

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

.post-nav__card {
  display: block;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  transition: border-color var(--ease-time), transform var(--ease-time);
}

.post-nav__card:hover,
.post-nav__card:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.post-nav__label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent-dark);
  font-size: var(--blog-small-size);
}

.post-nav__card strong {
  display: block;
  font-size: var(--blog-text-size);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.post-nav__next {
  grid-column: 2;
}

#related-posts {
  padding-block: 1rem 2rem;
}

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

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

.related-grid .article-card {
  padding: 1.2rem;
}

.related-grid .article-card h3 {
  font-size: 1.05rem;
}

.related-grid .article-card p {
  font-size: var(--blog-small-size);
}

:where(.prose, .article-body, .post-content, .blog-content) :is(img, svg, video) {
  max-width: 100%;
  height: auto;
}

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

  :where(.prose, .article-body, .post-content, .blog-content) .table-scroll table {
    display: table;
    width: 100%;
    max-width: none;
    overflow: visible;
  }

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

@media (max-width: 640px) {
  :root {
    --blog-gutter: 16px;
  }

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

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

  .blog-hero {
    padding: 1.75rem 0 2rem;
  }

  .blog-filters {
    justify-content: flex-start;
    padding: 0.75rem;
  }

  .article-hero {
    padding-block: 1.25rem 1.5rem;
  }

  .article-card {
    padding: 1.2rem;
  }

  .promo-block {
    padding: 1.5rem;
  }

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

  .post-nav__next {
    grid-column: auto;
  }

  :where(.prose, .article-body, .post-content, .blog-content) h2 {
    margin-top: 2rem;
  }
}

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

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