:root {
  --blog-reading: 56rem;
  --blog-title-list: 3rem;
  --blog-title-article: 2.6rem;
  --blog-title-section: 1.6rem;
  --blog-title-small: 1.3rem;
  --blog-body-size: 1rem;
  --blog-small-size: 0.875rem;
  --blog-label-size: 0.75rem;
  --blog-leading: 1.9;
  --blog-tracking: -0.02em;
  --blog-gap: 2rem;
  --blog-card-pad: 1.5rem;
  --blog-line: 1px;
  --blog-focus: 3px;
  --blog-motion: 180ms;
  --blog-hover-shift: -2px;
  --blog-ambient: color-mix(in srgb, var(--accent) 5%, var(--bg));
  --blog-tint: color-mix(in srgb, var(--accent) 8%, var(--bg-panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 8%, var(--bg-panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 9%, var(--bg-panel));
  --blog-focus-color: color-mix(in srgb, var(--accent) 65%, var(--text));
  --blog-code-bg: var(--text);
  --blog-code-text: var(--bg-panel);
  --blog-shadow: 0 12px 44px color-mix(in srgb, var(--accent) 10%, transparent);
  --blog-promo-rule: color-mix(in srgb, var(--text) 20%, var(--border));
}

.blog-index,
.blog-article {
  color: var(--text);
  background: linear-gradient(var(--blog-ambient), var(--bg) 24rem);
  font-family: var(--font-body);
  padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
}

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

.blog-skip {
  position: absolute;
  z-index: 100;
  inset-inline-start: var(--gutter);
  top: 0;
  padding: 0.75rem 1rem;
  background: var(--bg-panel);
  color: var(--accent-dark);
  transform: translateY(-120%);
  border-radius: var(--r-sm);
}

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

.blog-index :focus-visible,
.blog-article :focus-visible {
  outline: var(--blog-focus) solid var(--blog-focus-color);
  outline-offset: 4px;
}

.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.75rem;
  font-size: var(--blog-small-size);
  line-height: 1.8;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

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

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

.breadcrumbs a,
.article-card a,
.post-nav-card,
.prose a,
.blog-empty a {
  color: var(--accent-dark);
  text-underline-offset: 0.2em;
}

.blog-list-hero {
  position: relative;
  padding-block: 2rem 2.75rem;
  max-width: 48rem;
}

.blog-kicker {
  margin: 0 0 1rem;
  font: var(--weight-normal) var(--blog-small-size)/1.6 var(--font-mono);
  color: var(--text-muted);
}

.blog-list-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, var(--blog-title-list));
  font-weight: var(--weight-normal);
  line-height: 1.3;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.blog-list-hero > p:last-child {
  margin: 0;
  max-width: 40rem;
  color: var(--text-muted);
  line-height: var(--blog-leading);
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block: 1rem;
  border-block: var(--blog-line) solid var(--border);
}

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

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

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

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

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: var(--blog-card-pad);
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  box-shadow: inset 0 1px 0 var(--hl);
  transition: border-color var(--blog-motion), transform var(--blog-motion), box-shadow var(--blog-motion);
}

.article-card:hover,
.article-card:focus-within {
  border-color: var(--accent);
  transform: translateY(var(--blog-hover-shift));
  box-shadow: var(--blog-shadow);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.65rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
}

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

.article-card .tag-label,
.blog-meta .tag-label {
  display: inline-block;
  width: fit-content;
  padding: 0.3rem 0.65rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-xs);
  background: var(--bg-panel-2);
  color: var(--text);
  font-size: var(--blog-label-size);
  line-height: 1.5;
}

.article-card h3 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: var(--blog-title-small);
  font-weight: var(--weight-strong);
  line-height: 1.65;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

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

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

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

.article-read-link {
  align-self: flex-start;
  margin-top: auto;
  font-size: var(--blog-small-size);
}

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

/* 同一阅读列：外盒包含左右 gutter，正文不继承基础层的窄列上限。 */
.reading-wrap,
.article-hero,
.blog-hero,
.blog-article > .breadcrumbs,
.blog-article main > .breadcrumbs,
.blog-article > .promo-block,
.blog-article main > .promo-block,
.blog-article > #related-posts,
.blog-article main > #related-posts,
.blog-article > #post-nav,
.blog-article main > #post-nav {
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--gutter) + var(--gutter));
  padding-inline: var(--gutter);
  margin-inline: auto;
}

.article-hero,
.blog-hero {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 1fr);
  align-items: start;
  gap: var(--blog-gap);
  position: relative;
  padding-block: 1.75rem 2rem;
  margin-block: 0;
}

.article-hero::before,
.blog-hero::before {
  content: "";
  position: absolute;
  top: 0;
  inset-inline: var(--gutter);
  height: 6px;
  border-block: var(--blog-line) solid var(--border);
  background: var(--bg-panel-2);
}

.article-hero > *,
.blog-hero > * {
  min-width: 0;
}

.article-hero h1,
.blog-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  font-size: clamp(1.8rem, 3.6vw, var(--blog-title-article));
  line-height: 1.45;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

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

.blog-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel);
  box-shadow: inset 0 1px 0 var(--hl);
  font-size: var(--blog-small-size);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.blog-meta time,
.blog-meta .read-time,
.blog-meta .reading-time {
  display: inline-block;
  padding: 0.3rem 0.5rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-xs);
  color: var(--text-muted);
  font-size: var(--blog-label-size);
}

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

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

.reading-wrap .prose,
.reading-wrap [data-article-body] {
  width: 100%;
  max-width: none;
  margin-inline: auto;
}

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

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

.prose h2,
[data-article-body] h2 {
  position: relative;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.65rem;
  border-bottom: var(--blog-line) solid var(--border);
  font-size: var(--blog-title-section);
  line-height: 1.6;
  font-weight: var(--weight-strong);
  counter-increment: blog-section;
}

.prose > h2:first-child,
[data-article-body] > h2:first-child {
  margin-top: 0.75rem;
}

.prose h2::before,
[data-article-body] h2::before {
  content: counter(blog-section, decimal-leading-zero);
  display: inline-block;
  margin-inline-end: 0.65rem;
  padding: 0.1rem 0.45rem;
  vertical-align: 0.15em;
  background: var(--bg-panel-2);
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-xs);
  color: var(--text-muted);
  font: var(--weight-normal) var(--blog-label-size)/1.6 var(--font-mono);
}

.prose h3,
[data-article-body] h3 {
  margin: 1.75rem 0 0.75rem;
  font-size: var(--blog-title-small);
  line-height: 1.7;
  font-weight: var(--weight-strong);
}

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

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

.prose li + li,
[data-article-body] li + li {
  margin-top: 0.5rem;
}

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

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

.prose :not(pre) > code,
[data-article-body] :not(pre) > code {
  padding: 0.1rem 0.35rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-xs);
  background: var(--bg-panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.prose pre,
[data-article-body] pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 2.75rem 1.25rem 1.25rem;
  border: var(--blog-line) solid var(--blog-code-bg);
  border-radius: var(--r-md);
  background: var(--blog-code-bg);
  color: var(--blog-code-text);
  font: var(--weight-normal) var(--blog-small-size)/1.85 var(--font-mono);
  box-shadow: var(--blog-shadow);
}

.prose pre::before,
[data-article-body] pre::before {
  content: "VPNJo / NOTES";
  position: absolute;
  inset-inline: 1.25rem;
  top: 0.65rem;
  padding-bottom: 0.35rem;
  border-bottom: var(--blog-line) solid var(--text-muted);
  color: var(--blog-code-text);
  font-size: var(--blog-label-size);
}

.prose pre code,
[data-article-body] pre code {
  display: block;
  padding: 0;
  border: 0;
  background: var(--blog-code-bg);
  color: var(--blog-code-text);
  font: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

.prose .table-scroll,
[data-article-body] .table-scroll {
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-sm);
}

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

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

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

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

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

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

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

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

.prose blockquote,
[data-article-body] blockquote,
.callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.2rem 1.25rem 1.2rem 3.4rem;
  border: var(--blog-line) solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--r-sm);
  background: var(--blog-tint);
  color: var(--text);
}

.prose blockquote::before,
[data-article-body] blockquote::before,
.callout::before {
  content: "i";
  position: absolute;
  top: 1.25rem;
  inset-inline-start: 1rem;
  width: 1.4rem;
  height: 1.4rem;
  border: var(--blog-line) solid currentColor;
  border-radius: var(--r-pill);
  color: var(--text-muted);
  text-align: center;
  font: var(--weight-medium) var(--blog-small-size)/1.4rem var(--font-mono);
}

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

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

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

.callout > :last-child,
.prose 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 {
  padding: 1.25rem;
  border: var(--blog-line) solid var(--border);
  border-top: 3px solid var(--text-muted);
  border-radius: var(--r-sm);
  background: var(--bg-panel-2);
}

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

.stat-num {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text);
  font: var(--weight-medium) 1.5rem/1.5 var(--font-mono);
}

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

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

.check-list li {
  padding: 0.9rem 1rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel);
}

.prose .check-list li + li,
[data-article-body] .check-list li + li {
  margin-top: 0;
}

.verdict {
  margin-block: 1.5rem;
  padding: 1.1rem 1.25rem;
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--r-xs);
  background: var(--bg-panel-2);
  color: var(--text);
}

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

.promo-block {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2.5rem;
  padding: 2rem;
  border: var(--blog-line) solid var(--blog-promo-rule);
  border-top: 6px double var(--blog-promo-rule);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--bg-panel), var(--bg-panel-2));
  box-shadow: var(--blog-shadow), inset 0 1px 0 var(--hl);
}

.reading-wrap .promo-block {
  width: 100%;
  max-width: none;
}

.promo-copy {
  min-width: 0;
}

.promo-copy h2,
.promo-copy h3 {
  margin: 0 0 0.6rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-title-small);
  font-weight: var(--weight-strong);
  line-height: 1.6;
  text-wrap: pretty;
}

.promo-copy p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: 1.85;
}

.promo-actions {
  display: flex;
  flex-wrap: wrap;
  flex-shrink: 0;
  gap: 0.65rem;
}

.promo-block .btn-primary {
  background: linear-gradient(var(--accent), var(--accent-deep));
  color: var(--white);
  border-color: var(--accent-deep);
}

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

.promo-block .btn-quiet {
  background: var(--bg-panel);
  border: var(--blog-line) solid var(--border);
  color: var(--text);
}

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

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

#related-posts > h2 {
  margin: 0 0 1.25rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-title-section);
  font-weight: var(--weight-strong);
  line-height: 1.6;
  text-wrap: pretty;
  letter-spacing: var(--blog-tracking);
}

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

.related-card {
  padding: 1.15rem;
}

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

#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: var(--blog-line) solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel);
  text-decoration: none;
  transition: border-color var(--blog-motion), transform var(--blog-motion);
}

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

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

.post-nav-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
}

.post-nav-card strong {
  color: var(--text);
  font-size: var(--blog-body-size);
  font-weight: var(--weight-medium);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

@media (max-width: 860px) {
  .article-hero,
  .blog-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
  }

  .blog-meta {
    grid-row: 1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }

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

  .prose table,
  [data-article-body] table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

  .prose th,
  .prose td,
  [data-article-body] th,
  [data-article-body] td {
    min-width: 9rem;
  }

  .promo-block {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

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

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

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

  .article-card {
    padding: 1.25rem;
  }

  .promo-block {
    padding: 1.5rem;
  }

  .article-hero,
  .blog-hero {
    padding-bottom: 1.5rem;
  }

  .prose h2,
  [data-article-body] h2 {
    margin-top: 2rem;
  }
}

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

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