:root {
  --blog-reading: 56rem;
  --blog-gutter: 1.5rem;
  --blog-column: calc(var(--blog-reading) + var(--blog-gutter) * 2);
  --blog-band-bg: color-mix(in srgb, var(--panel-2) 68%, var(--bg-top));
  --blog-highlight: color-mix(in srgb, var(--ice) 30%, var(--panel));
  --blog-success-bg: color-mix(in srgb, var(--success) 9%, var(--panel));
  --blog-warning-bg: color-mix(in srgb, var(--warn) 11%, var(--panel));
  --blog-grain: color-mix(in srgb, var(--accent) 3%, transparent);
  --blog-shadow: 0 16px 48px color-mix(in srgb, var(--cobalt) 10%, transparent);
  --blog-inset: inset 0 1px 0 var(--hl);
  --blog-speed: 160ms;
  --blog-title-tracking: -0.015em;
}

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

.reading-wrap,
.article-hero,
.breadcrumbs,
.blog-content,
.article-body {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--blog-column);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
  min-width: 0;
}

.reading-wrap .article-body,
.reading-wrap .blog-content,
.article-body .blog-content {
  width: 100%;
  max-width: none;
  padding-inline: 0;
}

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

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

.blog-index a:focus-visible,
.blog-index button:focus-visible,
.reading-wrap a:focus-visible,
.reading-wrap button:focus-visible,
.float-cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.8;
}

.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-right: 0.65rem;
  color: var(--muted);
}

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

.blog-band {
  position: relative;
  background-color: var(--blog-band-bg);
  background-image: radial-gradient(var(--blog-grain) 0.7px, transparent 0.7px);
  background-size: 5px 5px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding-inline: 0;
}

.blog-band > .article-hero {
  width: 100%;
  margin-inline: auto;
}

.article-hero {
  padding-block: 2.5rem;
  padding-inline: var(--blog-gutter);
  border-radius: 0;
  text-align: left;
  box-shadow: none;
}

.article-hero:not(.blog-band > .article-hero) {
  background: var(--blog-band-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 0 0 100vmax var(--blog-band-bg);
  clip-path: inset(0 -100vmax);
}

.article-hero h1,
.blog-index h1,
.prose h2,
.prose h3,
.article-body h2,
.article-body h3,
.blog-content h2,
.blog-content h3,
.article-card h2,
.related-card h3 {
  display: block;
  font-family: var(--font-display);
  color: var(--text);
  letter-spacing: var(--blog-title-tracking);
  text-wrap: pretty;
  overflow-wrap: break-word;
  word-break: normal;
}

.article-hero h1 {
  margin: 0.7rem 0 1rem;
  font-size: clamp(1.8rem, 3.8vw, 2.6rem);
  line-height: 1.35;
  font-weight: var(--weight-display);
}

.blog-index .article-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
}

.hero-summary,
.article-hero > p:last-child {
  margin-bottom: 0;
  max-width: var(--blog-reading);
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

.meta,
.article-hero .meta {
  display: block;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: var(--weight-normal);
  line-height: 1.8;
  text-align: left;
  overflow-wrap: anywhere;
}

.article-hero .meta > span,
.article-hero .meta > time,
.article-hero .meta .tag,
.article-hero .meta .badge {
  display: inline;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: inherit;
  box-shadow: none;
}

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

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.blog-filters button {
  appearance: none;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: var(--weight-medium);
  line-height: 1.5;
  cursor: pointer;
  transition: border-color var(--blog-speed) var(--ease-out),
    background-color var(--blog-speed) var(--ease-out);
}

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

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

.blog-status {
  margin: 1rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.8;
}

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

.article-card,
.related-card {
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-card);
  background: var(--panel);
  box-shadow: var(--blog-shadow), var(--blog-inset);
  transition: border-color var(--blog-speed) var(--ease-out),
    transform var(--blog-speed) var(--ease-out);
}

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

.article-card h2 {
  margin: 0.7rem 0;
  font-size: 1.35rem;
  line-height: 1.55;
  font-weight: var(--weight-bold);
}

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

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

.article-summary {
  margin: 0.75rem 0 1rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

.article-read-link {
  display: inline-block;
  color: var(--accent);
  font-weight: var(--weight-semibold);
  font-size: 0.875rem;
  text-underline-offset: 0.25em;
}

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

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

.prose,
.article-body,
.blog-content {
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  counter-reset: blog-chapter;
  overflow-wrap: break-word;
}

.reading-wrap:has(> .prose),
article.reading-wrap {
  padding-top: 1.75rem;
  padding-bottom: 1.5rem;
}

.prose p,
.article-body p,
.blog-content p {
  margin-block: 1rem;
}

.prose h2,
.article-body h2,
.blog-content h2 {
  margin: 2rem 0 1rem;
  font-size: 1.6rem;
  line-height: 1.5;
  font-weight: var(--weight-display);
  scroll-margin-top: var(--anchor-offset);
}

.prose > h2:first-child,
.article-body > h2:first-child,
.blog-content > h2:first-child {
  margin-top: 0.5rem;
}

.prose h2::before,
.article-body h2::before,
.blog-content h2::before {
  content: "";
  display: inline-block;
  width: 1.25rem;
  height: 0.2rem;
  margin-right: 0.65rem;
  vertical-align: 0.25em;
  border-radius: var(--r-pill);
  background: var(--accent);
}

.prose h3,
.article-body h3,
.blog-content h3 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.3rem;
  line-height: 1.6;
  font-weight: var(--weight-bold);
}

.prose a,
.article-body a,
.blog-content a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

.prose ul,
.prose ol,
.article-body ul,
.article-body ol,
.blog-content ul,
.blog-content ol {
  padding-left: 1.5rem;
  margin-block: 1rem;
}

.prose li,
.article-body li,
.blog-content li {
  margin-block: 0.5rem;
}

.prose strong,
.article-body strong,
.blog-content strong {
  font-weight: var(--weight-bold);
}

.prose img,
.article-body img,
.blog-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-tile);
}

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

.prose code,
.article-body code,
.blog-content code {
  padding: 0.1em 0.35em;
  border-radius: var(--r-sm);
  background: var(--panel-2);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.875em;
  white-space: normal;
  overflow-wrap: anywhere;
}

.prose pre,
.article-body pre,
.blog-content pre {
  position: relative;
  max-width: 100%;
  margin-block: 1.5rem;
  padding: 2.8rem 1.25rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-card);
  background: var(--accent-dark);
  color: var(--on-dark);
  line-height: 1.75;
  box-shadow: var(--blog-shadow);
}

.prose pre::before,
.article-body pre::before,
.blog-content pre::before {
  content: "VPNUE / 配置参考";
  position: absolute;
  top: 0.6rem;
  left: 1.25rem;
  color: var(--on-dark-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.prose pre code,
.article-body pre code,
.blog-content pre code {
  padding: 0;
  border-radius: 0;
  background: none;
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
}

.table-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.prose table,
.article-body table,
.blog-content table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.prose caption,
.article-body caption,
.blog-content caption {
  padding: 0.75rem 1rem;
  color: var(--muted);
  text-align: left;
  font-size: 0.875rem;
}

.prose th,
.prose td,
.article-body th,
.article-body td,
.blog-content th,
.blog-content td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  word-break: keep-all;
  overflow-wrap: normal;
}

.prose thead th,
.article-body thead th,
.blog-content thead th {
  background: var(--accent);
  color: var(--white);
  font-weight: var(--weight-semibold);
}

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

.prose tbody tr:hover,
.article-body tbody tr:hover,
.blog-content tbody tr:hover {
  background: var(--blog-highlight);
}

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

.callout {
  padding-left: 3.25rem;
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.15rem;
  left: 1rem;
  display: inline-block;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid currentColor;
  border-radius: var(--r-round);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: var(--weight-bold);
  line-height: 1.35rem;
  text-align: center;
}

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

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

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

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

.callout > :first-child,
.verdict > :first-child,
.prose blockquote > :first-child {
  margin-top: 0;
}

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

.verdict {
  background: var(--blog-highlight);
}

.verdict strong:first-child {
  font-weight: var(--weight-bold);
  color: var(--accent);
}

.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(--accent);
  border-radius: var(--r-card);
  background: var(--panel);
  box-shadow: var(--blog-inset);
}

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

.stat-num {
  display: block;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: var(--weight-bold);
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.8;
}

.prose .check-list,
.article-body .check-list,
.blog-content .check-list,
.check-list {
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0.6rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-tile);
  background: var(--panel);
}

.blog-promo-wrap {
  padding-block: 1rem 2.5rem;
}

.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  margin-block: 1.5rem;
  padding: 1.75rem;
  border: 1px solid var(--hl-soft);
  border-radius: var(--r-card);
  background: linear-gradient(125deg, var(--cobalt-900), var(--cobalt));
  color: var(--on-dark);
  box-shadow: var(--blog-shadow);
  isolation: isolate;
  overflow: hidden;
}

.promo-block::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 1rem;
  border: 1px solid var(--hl-soft);
  border-radius: var(--r-card);
  pointer-events: none;
}

.promo-block > div:first-child {
  flex: 1 1 20rem;
  min-width: 0;
}

.promo-brand {
  display: block;
  color: var(--on-dark);
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: var(--weight-display);
  letter-spacing: 0.02em;
}

.promo-block p {
  margin: 0.5rem 0 0;
  color: var(--on-dark);
  font-size: 1rem;
  line-height: 1.85;
}

.promo-block .promo-note {
  color: var(--on-dark-soft);
  font-size: 0.875rem;
}

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

.promo-block .btn-primary,
.promo-block .btn-secondary {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid var(--white);
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: var(--weight-semibold);
  line-height: 1.5;
  text-decoration: none;
  box-shadow: none;
}

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

.promo-block .btn-secondary {
  background: transparent;
  color: var(--on-dark);
}

.promo-block a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.promo-block a:focus-visible {
  outline-color: var(--white);
}

#related-posts,
#post-nav {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--blog-column);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
  min-width: 0;
}

.reading-wrap > #related-posts,
.reading-wrap > #post-nav {
  max-width: none;
  padding-inline: 0;
}

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

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

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

.related-card {
  padding: 1.25rem;
}

.related-card h3 {
  margin: 0.65rem 0;
  font-size: 1.125rem;
  font-weight: var(--weight-bold);
  line-height: 1.65;
}

.related-card .article-summary {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 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-card);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--blog-speed) var(--ease-out),
    transform var(--blog-speed) var(--ease-out);
}

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

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

.post-nav-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.8;
}

.post-nav-card strong {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: var(--weight-bold);
  line-height: 1.75;
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.float-cta {
  position: fixed;
  z-index: 40;
  right: max(1.25rem, env(safe-area-inset-right));
  bottom: calc(1.25rem + env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  max-width: calc(100vw - 2.5rem);
  padding: 0.8rem 1.2rem;
  border: 1px solid var(--hl-on-ink);
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: var(--weight-semibold);
  line-height: 1.5;
  text-decoration: none;
  box-shadow: var(--blog-shadow);
}

.float-cta svg {
  flex: 0 0 auto;
  width: 1.1rem;
  height: 1.1rem;
  color: inherit;
}

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

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

  .related-card .article-summary {
    font-size: 1rem;
  }
}

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

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

  .blog-index .article-hero h1 {
    font-size: clamp(1.9rem, 8vw, 2.25rem);
  }

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

  .article-card {
    padding: 1.25rem;
  }

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

  .promo-block {
    padding: 1.5rem;
  }

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

  .promo-block .button-row a {
    flex: 1 1 auto;
  }

  .float-cta {
    right: max(1rem, env(safe-area-inset-right));
    bottom: calc(0.75rem + env(safe-area-inset-bottom));
    max-width: calc(100vw - 2rem);
    padding: 0.65rem 1rem;
    font-size: 0.875rem;
  }

  body:has(.float-cta) {
    padding-bottom: calc(5rem + env(safe-area-inset-bottom));
  }
}

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

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