/* ==========================================================================
   VPNBL · 博客样式包
   适用：zh-CN/blog/index.html（列表页）、zh-CN/blog/articles/*.html（文章页）
   颜色 / 圆角 / 阴影 / 字体全部引用 base.css 的 :root 设计令牌，不写死色值
   ========================================================================== */

:root{
  --reading-col: 56rem;
  --chrome-h: 2.25rem;
  --blog-gap: clamp(1.125rem, 2.4vw, 1.75rem);
}

/* --------------------------------------------------------------------------
   1. 阅读列：面包屑 / 文章 hero / 正文 / 文末块共用同一条列并居中
   -------------------------------------------------------------------------- */

.reading-wrap,
.prose.reading-wrap{
  width: 100%;
  max-width: calc(var(--reading-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --------------------------------------------------------------------------
   2. 列表页：窗口栏 hero
   -------------------------------------------------------------------------- */

.blog-hero{
  padding-block: clamp(2rem, 4.6vw, 3.25rem) clamp(1.25rem, 2.6vw, 1.75rem);
}

.chrome-card,
.article-hero__card{
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

/* 文章 hero 卡片:左右各外扩一个 gutter,让卡片内衬吃掉扩宽,
   标题与面包屑/正文落在同一条阅读列(内衬不清零,标题不贴边) */
.article-hero__card{
  width: calc(100% + 2 * var(--gutter));
  margin-inline: calc(-1 * var(--gutter));
}

.chrome-bar{
  display: flex;
  align-items: center;
  gap: .75rem;
  height: var(--chrome-h);
  padding-inline: 1rem;
  background: linear-gradient(180deg, var(--bg-panel-3), var(--bg-panel-2));
  border-bottom: 1px solid var(--border);
}

.chrome-bar__dots{
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  flex: 0 0 auto;
}

.chrome-bar__dots i{
  display: block;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
}

.chrome-bar__dots i:nth-child(1){background: var(--error);}
.chrome-bar__dots i:nth-child(2){background: var(--warn);}
.chrome-bar__dots i:nth-child(3){background: var(--success);}

.chrome-bar__file{
  margin-left: auto;
  font-size: .75rem;
  color: var(--text-muted);
  letter-spacing: .04em;
}

.chrome-card__body{
  padding: clamp(1.5rem, 3vw, 2.125rem) clamp(1.5rem, 3.2vw, 2.5rem) clamp(1.75rem, 3.4vw, 2.5rem);
}

.blog-hero__title{
  margin: .5rem 0 .875rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.2vw, 3rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
}

.blog-hero__lead{
  margin: 0;
  max-width: 46rem;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   3. 列表页：筛选条 / 计数 / 文章卡网格
   -------------------------------------------------------------------------- */

.blog-list-sec{
  padding-top: clamp(1rem, 2.4vw, 1.75rem);
}

.blog-filter{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.25rem;
}

.filter-btn{
  appearance: none;
  font-family: inherit;
  font-size: .875rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text-muted);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: .6875rem 1.0625rem;
  min-height: 2.5rem;
  cursor: pointer;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.filter-btn:hover{
  color: var(--accent);
  border-color: var(--accent-edge);
  box-shadow: var(--shadow-xs);
}

.filter-btn.is-active,
.filter-btn.is-active:hover{
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-panel);
}

.blog-list__head{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .375rem 1rem;
  margin-bottom: 1.125rem;
}

.blog-list__title{
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.blog-count{
  margin: 0;
  font-size: .8125rem;
  color: var(--text-muted);
}

.post-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
  gap: var(--blog-gap);
}

.post-card{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .625rem;
  padding: 1.5rem 1.5rem 1.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-xs);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.post-card::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--r-card) var(--r-card) 0 0;
  background: linear-gradient(90deg, var(--accent), var(--card-cyan));
  opacity: 0;
  transition: opacity .2s ease;
}

.post-card:hover,
.post-card:focus-within{
  transform: translateY(-3px);
  border-color: var(--accent-edge);
  box-shadow: var(--shadow-panel);
}

.post-card:hover::before,
.post-card:focus-within::before{
  opacity: 1;
}

.post-card__meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
}

.post-card__date{
  font-size: .75rem;
  color: var(--text-muted);
  letter-spacing: .02em;
}

.post-card__title{
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
}

.post-card__sum{
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.post-card__more{
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  align-self: flex-start;
  margin-top: auto;
  padding-top: .625rem;
  font-size: .875rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

.post-card__more::after{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-card);
}

.post-card__arrow{
  flex: 0 0 auto;
  transition: transform .2s ease;
}

.post-card:hover .post-card__more{
  color: var(--accent-lift);
}

.post-card:hover .post-card__arrow{
  transform: translateX(3px);
}

.blog-empty{
  margin: 1.5rem 0 0;
  padding: 1.5rem;
  text-align: center;
  font-size: .9375rem;
  color: var(--text-muted);
  background: var(--bg-panel-2);
  border: 1px dashed var(--border);
  border-radius: var(--r-card);
}

/* --------------------------------------------------------------------------
   4. 文章页：面包屑
   -------------------------------------------------------------------------- */

.article-main{
  padding-block: 0 clamp(2.5rem, 5vw, 4rem);
}

.breadcrumb{
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.breadcrumb__list{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb__list li{
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  min-width: 0;
}

.breadcrumb__list li + li::before{
  content: "/";
  color: var(--border);
}

.breadcrumb a{
  color: var(--text-muted);
  text-decoration: none;
  transition: color .18s ease;
}

.breadcrumb a:hover{
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumb [aria-current="page"]{
  color: var(--text);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   5. 文章页：hero（window-chrome 窗口栏卡片）
   -------------------------------------------------------------------------- */

.article-hero{
  margin-top: clamp(.875rem, 2vw, 1.25rem);
}

.article-hero__body{
  padding: clamp(1.375rem, 2.6vw, 1.75rem) clamp(1.5rem, 3vw, 2.125rem) clamp(1.5rem, 3vw, 2rem);
}

.article-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.article-meta__tag,
.article-meta .badge--soft{
  display: inline-flex;
  align-items: center;
  padding: .3125rem .75rem;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--r-pill);
  color: var(--bg-panel);
  font-size: .75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .02em;
}

.article-meta__date,
.article-meta__time{
  display: inline-flex;
  align-items: center;
  padding: .3125rem .75rem;
  background: var(--bg-panel-3);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  color: var(--text-muted);
  font-size: .75rem;
  line-height: 1.4;
}

.article-hero__title{
  margin: 0 0 .875rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.6rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
}

.article-hero__sum{
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   6. 文章正文：基础排版
   -------------------------------------------------------------------------- */

:is(.article-body, .prose){
  counter-reset: blog-sec;
  margin-top: clamp(1.25rem, 2.4vw, 1.75rem);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  overflow-wrap: break-word;
}

:is(.article-body, .prose) > :first-child{
  margin-top: 0;
}

:is(.article-body, .prose) p{
  margin: 0 0 1.15em;
}

:is(.article-body, .prose) h2{
  counter-increment: blog-sec;
  position: relative;
  margin: 2.5rem 0 1rem;
  padding: 0 0 .625rem 2.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  text-wrap: pretty;
}

:is(.article-body, .prose) h2::before{
  content: counter(blog-sec, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .1em;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--r-btn);
  background: var(--accent-wash);
  border: 1px solid var(--accent-edge);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}

:is(.article-body, .prose) h3{
  margin: 2rem 0 .75rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.7vw, 1.3rem);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--accent-dark);
  text-wrap: pretty;
}

:is(.article-body, .prose) h4{
  margin: 1.5rem 0 .625rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--text);
  text-wrap: pretty;
}

:is(.article-body, .prose) a{
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-edge);
  text-underline-offset: 3px;
  transition: text-decoration-color .18s ease;
}

:is(.article-body, .prose) a:hover{
  text-decoration-color: var(--accent);
}

:is(.article-body, .prose) strong,
:is(.article-body, .prose) b{
  color: var(--accent-dark);
  font-weight: 700;
}

:is(.article-body, .prose) ul:not(.check-list),
:is(.article-body, .prose) ol:not(.check-list){
  margin: 0 0 1.25em;
  padding-left: 1.4em;
}

:is(.article-body, .prose) ul:not(.check-list) li,
:is(.article-body, .prose) ol:not(.check-list) li{
  margin-bottom: .5em;
}

:is(.article-body, .prose) li::marker{
  color: var(--accent);
}

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

:is(.article-body, .prose) hr{
  margin: 2.25rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

:is(.article-body, .prose) blockquote{
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-panel-3);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-btn);
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text);
}

:is(.article-body, .prose) blockquote p:last-child{
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   7. 正文富组件：表格 / 代码 / callout / 数据卡 / 勾叉清单 / 结论块
   -------------------------------------------------------------------------- */

:is(.article-body, .prose) table{
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-btn);
  overflow: hidden;
  font-size: .9375rem;
}

:is(.article-body, .prose) thead th{
  padding: .75rem .875rem;
  background: var(--accent-dark);
  color: var(--bg-panel);
  font-size: .875rem;
  font-weight: 700;
  text-align: left;
  letter-spacing: .02em;
  white-space: nowrap;
}

:is(.article-body, .prose) tbody td,
:is(.article-body, .prose) tbody th{
  padding: .75rem .875rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  text-align: left;
  line-height: 1.7;
}

:is(.article-body, .prose) tbody tr:nth-child(even){
  background: var(--bg-panel-3);
}

:is(.article-body, .prose) tbody tr:hover{
  background: var(--accent-wash);
}

:is(.article-body, .prose) tbody tr:last-child td,
:is(.article-body, .prose) tbody tr:last-child th{
  border-bottom: 0;
}

:is(.article-body, .prose) code{
  padding: .15em .4em;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: var(--r-btn);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: .875em;
}

:is(.article-body, .prose) pre{
  position: relative;
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 2.75rem 1.25rem 1.25rem;
  background: var(--accent-dark);
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-win);
  box-shadow: var(--shadow-xs);
  overflow-x: auto;
}

:is(.article-body, .prose) pre::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1.875rem;
  background-color: var(--footer-bg-deep);
  background-image:
    radial-gradient(circle at 1.0625rem 50%, var(--error) 0 .25rem, transparent .25rem),
    radial-gradient(circle at 1.9375rem 50%, var(--warn) 0 .25rem, transparent .25rem),
    radial-gradient(circle at 2.8125rem 50%, var(--success) 0 .25rem, transparent .25rem);
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--border-soft);
}

:is(.article-body, .prose) pre code{
  display: block;
  padding: 0;
  background: none;
  border: 0;
  border-radius: 0;
  color: var(--bg-panel-3);
  font-family: var(--font-mono);
  font-size: .875rem;
  line-height: 1.7;
  white-space: pre;
}

.callout{
  position: relative;
  margin: 1.5rem 0;
  padding: 1.0625rem 1.25rem 1.0625rem 3.25rem;
  background: var(--bg-panel-3);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-btn);
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text);
}

.callout::before{
  content: "i";
  position: absolute;
  left: 1rem;
  top: 1.0625rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-panel);
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  line-height: 1;
}

.callout p:last-child{
  margin-bottom: 0;
}

.callout--warn{
  background: color-mix(in srgb, var(--warn) 10%, var(--bg-panel));
  border-left-color: var(--warn);
}

.callout--warn::before{
  content: "!";
  background: var(--warn);
}

.callout--ok{
  background: color-mix(in srgb, var(--success) 10%, var(--bg-panel));
  border-left-color: var(--success);
}

.callout--ok::before{
  content: "";
  background: var(--success);
}

.callout--ok::after{
  content: "";
  position: absolute;
  left: 1.5rem;
  top: 1.68rem;
  width: .5rem;
  height: .3rem;
  border-left: 2px solid var(--bg-panel);
  border-bottom: 2px solid var(--bg-panel);
  transform: rotate(-45deg);
}

.stat-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr));
  gap: .875rem;
  margin: 1.5rem 0;
}

.stat-card{
  position: relative;
  padding: 1.125rem 1.125rem 1rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  overflow: hidden;
}

.stat-card::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
}

.stat-card:nth-child(2){
  background: color-mix(in srgb, var(--card-violet) 7%, var(--bg-panel));
}

.stat-card:nth-child(2)::before{background: var(--card-violet);}

.stat-card:nth-child(3){
  background: color-mix(in srgb, var(--card-cyan) 12%, var(--bg-panel));
}

.stat-card:nth-child(3)::before{background: var(--card-cyan);}

.stat-card:nth-child(4){
  background: color-mix(in srgb, var(--card-gold) 10%, var(--bg-panel));
}

.stat-card:nth-child(4)::before{background: var(--card-gold);}

.stat-num{
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--accent-dark);
  font-variant-numeric: tabular-nums;
}

.stat-label{
  display: block;
  margin-top: .375rem;
  font-size: .8125rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.check-list{
  display: grid;
  gap: .625rem;
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
}

.check-list li{
  margin: 0;
  padding: .75rem .9375rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-edge);
  border-radius: var(--r-btn);
  font-size: .9375rem;
  line-height: 1.75;
}

.verdict{
  margin: 1.5rem 0;
  padding: 1.125rem 1.25rem 1.125rem 1.5rem;
  background: var(--accent-wash);
  border: 1px solid var(--accent-edge);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-btn);
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text);
}

.verdict strong,
.verdict b{
  color: var(--accent-dark);
}

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

/* --------------------------------------------------------------------------
   8. 文末推广块（彩底重配色）
   -------------------------------------------------------------------------- */

.promo-block{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin: 0;
  padding: clamp(1.5rem, 3vw, 2rem) clamp(1.5rem, 3vw, 2.25rem);
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 58%, var(--accent-lift) 100%);
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-panel);
}

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

.promo-block__brand{
  margin: 0 0 .25rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--bg-panel);
}

.promo-block__line{
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: color-mix(in srgb, var(--bg-panel) 84%, transparent);
}

.promo-block .btn--light{
  background: var(--bg-panel);
  border-color: var(--bg-panel);
  color: var(--accent-dark);
}

.promo-block .btn--light:hover{
  background: var(--bg-panel-3);
  border-color: var(--bg-panel-3);
  color: var(--accent-dark);
}

main > .promo-block,
.article-main .promo-block{
  width: 100%;
  max-width: calc(var(--reading-col) + 2 * var(--gutter));
  margin: clamp(2rem, 4vw, 3rem) auto 0;
}

.blog-promo{
  padding-block: 0 clamp(3rem, 6vw, 4.5rem);
}

/* --------------------------------------------------------------------------
   9. 延伸阅读 / 上一篇 · 下一篇（挂载点自带阅读列）
   -------------------------------------------------------------------------- */

#related-posts,
#post-nav{
  width: 100%;
  max-width: calc(var(--reading-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

#related-posts{
  padding-top: clamp(2rem, 4vw, 2.5rem);
  padding-bottom: .5rem;
}

#post-nav{
  padding-top: 1.5rem;
  padding-bottom: clamp(2rem, 4vw, 2.5rem);
}

#related-posts .related__title{
  margin: 0;
  padding-left: .875rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--r-btn);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
}

#related-posts .related-list{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: .875rem;
  margin-top: 1rem;
}

#related-posts .related-card{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.125rem 1.125rem 1rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-xs);
  color: var(--text);
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

#related-posts .related-card::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--r-card) var(--r-card) 0 0;
  background: linear-gradient(90deg, var(--accent), var(--card-violet));
  opacity: 0;
  transition: opacity .2s ease;
}

#related-posts .related-card:hover,
#related-posts .related-card:focus-visible{
  transform: translateY(-2px);
  border-color: var(--accent-edge);
  box-shadow: var(--shadow-panel);
}

#related-posts .related-card:hover::before,
#related-posts .related-card:focus-visible::before{
  opacity: 1;
}

#related-posts .related-card__tag{
  align-self: flex-start;
  padding: .1875rem .5rem;
  background: var(--accent-wash);
  border: 1px solid var(--accent-edge);
  border-radius: var(--r-pill);
  color: var(--accent);
  font-size: .6875rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .02em;
}

#related-posts .related-card__title{
  font-size: .9375rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

#related-posts .related-card__date{
  font-size: .75rem;
  color: var(--text-muted);
}

#post-nav .post-nav__list{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: .875rem;
}

#post-nav .post-nav__link{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .375rem;
  padding: 1rem 1.125rem;
  background: var(--bg-panel-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  color: var(--text);
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

#post-nav .post-nav__link::before{
  content: "";
  position: absolute;
  top: 0;
  left: 1.125rem;
  right: 1.125rem;
  height: 3px;
  border-radius: 0 0 var(--r-btn) var(--r-btn);
  background: var(--accent);
  opacity: 0;
  transition: opacity .2s ease;
}

#post-nav .post-nav__link:hover,
#post-nav .post-nav__link:focus-visible{
  transform: translateY(-2px);
  border-color: var(--accent-edge);
  box-shadow: var(--shadow-xs);
}

#post-nav .post-nav__link:hover::before,
#post-nav .post-nav__link:focus-visible::before{
  opacity: 1;
}

#post-nav .post-nav__label{
  font-size: .75rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--accent);
  letter-spacing: .02em;
}

#post-nav .post-nav__title{
  font-size: .9375rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

/* --------------------------------------------------------------------------
   10. 响应式与降级
   -------------------------------------------------------------------------- */

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

@media (max-width: 640px){
  .post-card{
    padding: 1.25rem 1.25rem 1.125rem;
  }

  .blog-hero__lead{
    font-size: 1rem;
  }

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

@media (prefers-reduced-motion: reduce){
  .post-card,
  .post-card__arrow,
  .filter-btn,
  .breadcrumb a,
  #related-posts .related-card,
  #post-nav .post-nav__link{
    transition: none;
  }

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

  .post-card:hover .post-card__arrow{
    transform: none;
  }
}