/* ==========================================================================
   VPNNK · 博客样式(列表页 + 文章页)
   全部颜色、圆角、字体取自 base.css 的设计令牌,不新增图片与字体依赖
   文章页 hero 版式:centered-formal(居中刊头)
   ========================================================================== */

:root{
  --reading-col: 56rem;
  --blog-line: color-mix(in srgb, var(--border) 72%, var(--bg-panel));
  --blog-tint-accent: color-mix(in srgb, var(--accent-soft) 78%, var(--bg-panel));
  --blog-tint-violet: color-mix(in srgb, var(--violet-soft) 78%, var(--bg-panel));
  --blog-tint-ice: color-mix(in srgb, var(--ice-soft) 78%, var(--bg-panel));
}

/* ---------- 1. 共用阅读列(面包屑 / Hero / 正文 / 推广块同一条列) ---------- */

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

.article-body{
  width: 100%;
  max-width: calc(var(--reading-col) + 2 * var(--gutter));
  margin-inline: auto;
}

.article-page{
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

/* ---------- 2. 面包屑:与页头留呼吸间距 ---------- */

.crumbs{
  margin-top: 1.6rem;
  padding-top: .4rem;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.crumbs ol{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.crumbs li{
  display: flex;
  align-items: center;
  gap: .45rem;
  min-width: 0;
}

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

.crumbs a{
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.crumbs a:hover{
  color: var(--accent-dark);
  border-bottom-color: var(--accent-line);
}

.crumbs .current,
.crumbs [aria-current="page"]{
  color: var(--text);
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- 3. 刊头共用件(列表页 + 文章页) ---------- */

.blog-hero .kicker,
.article-hero .kicker{
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.blog-hero .kicker::before,
.article-hero .kicker::before{
  content: "";
  width: .6rem;
  height: .6rem;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--violet));
}

.hero-rule{
  display: block;
  width: 3.5em;
  height: 3px;
  margin: 1.15rem auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--violet));
}

/* ---------- 4. 列表页刊头 ---------- */

.blog-hero{
  padding-block: clamp(2.2rem, 5vw, 3.6rem) clamp(1.2rem, 2.6vw, 1.8rem);
  text-align: center;
}

.blog-hero h1{
  max-width: 24ch;
  margin: .2rem auto 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.6vw, 3rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  text-wrap: pretty;
  color: var(--text);
}

.blog-lede{
  max-width: 44rem;
  margin: 1.1rem auto 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.blog-meta{
  margin: 1rem auto 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--text-muted);
}

.blog-meta span{
  margin-inline: .5rem;
  color: var(--border);
}

/* ---------- 5. 分类筛选 ---------- */

.filter-bar{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.7rem;
}

.filter-btn{
  font: inherit;
  font-size: .9rem;
  line-height: 1.2;
  padding: .5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-panel);
  color: var(--text-muted);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease, transform .18s ease;
}

.filter-btn:hover{
  color: var(--accent-dark);
  border-color: var(--accent-line);
  transform: translateY(-1px);
}

.filter-btn:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.filter-btn.is-active{
  color: var(--on-ink);
  border-color: transparent;
  background: linear-gradient(120deg, var(--accent), var(--violet));
}

/* ---------- 6. 文章卡片网格 ---------- */

.post-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1.2rem;
}

.post{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .65rem;
  padding: 1.35rem 1.3rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  box-shadow: var(--shadow-soft);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.post[hidden]{
  display: none;
}

.post::after{
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: linear-gradient(90deg, var(--accent), var(--violet), var(--ice));
  opacity: 0;
  transition: opacity .2s ease;
}

.post:hover{
  transform: translateY(-3px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-card);
}

.post:hover::after{
  opacity: 1;
}

.post-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--text-muted);
}

.post h3{
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

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

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

.post-summary{
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--text-muted);
}

.post .link-arrow{
  margin-top: auto;
  padding-top: .35rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

.post .link-arrow svg{
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .18s ease;
}

.post .link-arrow:hover svg{
  transform: translateX(3px);
}

.post-empty{
  margin: 0;
  padding: 1.6rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  color: var(--text-muted);
  text-align: center;
}

.post-empty[hidden]{
  display: none;
}

/* ---------- 7. 文章页刊头(centered-formal 居中刊头) ---------- */

.article-hero{
  max-width: calc(var(--reading-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: clamp(1.4rem, 3vw, 2.2rem) clamp(1.6rem, 3.4vw, 2.6rem);
  text-align: center;
}

.article-hero h1{
  margin: .75rem auto 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  text-wrap: pretty;
  color: var(--text);
}

.article-summary{
  max-width: 42rem;
  margin: 1rem auto 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.article-meta{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: .5rem .6rem;
  margin: 1.05rem 0 0;
  padding: 0;
  font-size: .82rem;
  color: var(--text-muted);
}

.article-meta > * + *::before{
  content: "·";
  margin-right: .6rem;
  color: var(--border);
}

.article-meta time{
  font-family: var(--font-mono);
  letter-spacing: .02em;
}

/* ---------- 8. 正文排版 ---------- */

.prose{
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  overflow-wrap: break-word;
}

.prose > * + *{
  margin-top: 1.15em;
}

.prose p{
  margin: 0;
}

.prose h2{
  position: relative;
  margin-top: 2.4em;
  padding-left: 1.4rem;
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.2vw, 1.6rem);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.prose h2::before{
  content: "";
  position: absolute;
  left: 0;
  top: .45em;
  width: .62rem;
  height: .62rem;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--violet));
}

.prose h3{
  margin-top: 1.9em;
  font-family: var(--font-display);
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.prose h3::before{
  content: "";
  display: inline-block;
  width: .55rem;
  height: 2px;
  margin-right: .5rem;
  vertical-align: .28em;
  border-radius: 2px;
  background: var(--violet);
}

.prose ul,
.prose ol{
  padding-left: 1.35rem;
}

.prose li{
  margin-top: .4rem;
}

.prose li::marker{
  color: var(--accent);
}

.prose a{
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--accent-line);
  text-underline-offset: .18em;
}

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

.prose strong{
  font-weight: 700;
  color: var(--text);
}

.prose img{
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  border: 1px solid var(--border);
}

.prose hr{
  height: 1px;
  margin-block: 2rem;
  border: 0;
  background: var(--border);
}

.prose blockquote{
  margin-inline: 0;
  padding: .9rem 1.15rem;
  border-left: 3px solid var(--violet);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: var(--blog-tint-violet);
  color: var(--text);
}

.prose blockquote p + p{
  margin-top: .7rem;
}

.prose code{
  font-family: var(--font-mono);
  font-size: .88em;
}

.prose :not(pre) > code{
  padding: .15em .42em;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-panel-2);
  color: var(--text);
}

/* 终端窗风格的代码块 */

.prose pre{
  position: relative;
  padding: 2.5rem 1.15rem 1.15rem;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-m);
  background: var(--ink);
  color: var(--on-ink);
  box-shadow: var(--shadow-win);
  overflow-x: auto;
  max-width: 100%;
  font-size: .86rem;
  line-height: 1.7;
}

.prose pre::before{
  content: "";
  position: absolute;
  top: 1rem;
  left: 1.15rem;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

.prose pre::after{
  content: "shell";
  position: absolute;
  top: .85rem;
  right: 1.15rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--on-ink-muted);
}

.prose pre code{
  display: block;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}

/* 表格:实色表头 + 斑马纹 + hover,窄屏可横滑 */

.prose table{
  width: 100%;
  border-collapse: collapse;
  font-size: .94rem;
  line-height: 1.65;
}

.prose thead th{
  padding: .7rem .85rem;
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.prose tbody td{
  padding: .68rem .85rem;
  border-bottom: 1px solid var(--blog-line);
  vertical-align: top;
}

.prose tbody tr:nth-child(even){
  background: color-mix(in srgb, var(--bg-panel-2) 55%, transparent);
}

.prose tbody tr:hover{
  background: var(--blog-tint-accent);
}

@media (max-width: 860px){
  .prose table{
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ---------- 9. 正文富文本组件 ---------- */

.prose .stat-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: .9rem;
  margin-block: 1.7rem;
}

.prose .stat-card{
  position: relative;
  padding: 1.15rem 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  overflow: hidden;
}

.prose .stat-card::before{
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--accent);
}

.prose .stat-card.is-violet::before{
  background: var(--violet);
}

.prose .stat-card.is-ice::before{
  background: var(--ice);
}

.prose .stat-card.is-tint{
  background: linear-gradient(160deg, var(--blog-tint-accent), var(--bg-panel) 70%);
}

.prose .stat-card.is-violet.is-tint{
  background: linear-gradient(160deg, var(--blog-tint-violet), var(--bg-panel) 70%);
}

.prose .stat-card .stat-num{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  color: var(--accent-dark);
}

.prose .stat-card.is-violet .stat-num{
  color: var(--violet);
}

.prose .stat-card.is-ice .stat-num{
  color: color-mix(in srgb, var(--ice) 62%, var(--text));
}

.prose .stat-card .stat-label{
  display: block;
  margin-top: .4rem;
  font-size: .84rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* 勾叉清单:样式只做容器/行卡装饰,✅/❌ 由 li 文本开头携带,不注入任何符号 */

.prose .check-list{
  margin-block: 1.5rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .55rem;
}

.prose .check-list li{
  margin: 0;
  padding: .8rem 1rem;
  border: 1px solid var(--blog-line);
  border-left: 3px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--bg-panel);
  font-size: .95rem;
  line-height: 1.75;
}

.prose .check-list li:nth-child(odd){
  background: color-mix(in srgb, var(--bg-panel-2) 42%, var(--bg-panel));
}

.prose .check-list li:hover{
  border-left-color: var(--accent);
}

/* 结论块 */

.prose .verdict{
  margin-block: 1.6rem;
  padding: .95rem 1.15rem .95rem 1.25rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: var(--blog-tint-accent);
  font-size: .97rem;
  line-height: 1.8;
}

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

.prose .verdict.is-success{
  border-left-color: var(--success);
  background: var(--success-soft);
}

.prose .verdict.is-success b,
.prose .verdict.is-success strong{
  color: color-mix(in srgb, var(--success) 78%, var(--text));
}

.prose .verdict.is-warn{
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 14%, var(--bg-panel));
}

.prose .verdict.is-warn b,
.prose .verdict.is-warn strong{
  color: color-mix(in srgb, var(--warn) 66%, var(--text));
}

/* callout:左色条 + ::before 图标徽 */

.prose .callout{
  position: relative;
  margin-block: 1.5rem;
  padding: 1rem 1.15rem 1rem 3.1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--ice);
  border-radius: var(--radius-s);
  background: var(--blog-tint-ice);
  font-size: .95rem;
  line-height: 1.8;
}

.prose .callout::before{
  content: "";
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: var(--ice);
  box-shadow: inset 0 0 0 2px var(--bg-panel);
}

.prose .callout.is-warning{
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 13%, var(--bg-panel));
}

.prose .callout.is-warning::before{
  background: var(--warn);
}

.prose .callout.is-success{
  border-left-color: var(--success);
  background: var(--success-soft);
}

.prose .callout.is-success::before{
  background: var(--success);
}

.prose .callout strong{
  color: var(--text);
}

/* ---------- 10. 文末推广卡(彩底重配色) ---------- */

.promo-block{
  margin-top: 2.6rem;
  padding: 1.5rem 1.4rem;
  border-radius: var(--radius-l);
  background: linear-gradient(125deg, var(--accent) 0%, var(--accent-dark) 46%, var(--violet) 100%);
  color: var(--on-ink);
  box-shadow: var(--shadow-card);
}

.promo-block b{
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.promo-block p{
  margin: .5rem 0 1.1rem;
  font-size: .95rem;
  line-height: 1.8;
  color: color-mix(in srgb, var(--on-ink) 90%, var(--accent));
}

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

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

.promo-block .promo-actions{
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.promo-block .promo-actions .btn-ghost{
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--on-ink) 55%, transparent);
  color: var(--on-ink);
}

.promo-block .promo-actions .btn-ghost:hover{
  background: color-mix(in srgb, var(--on-ink) 14%, transparent);
  border-color: var(--on-ink);
  color: var(--on-ink);
}

/* ---------- 11. 延伸阅读 + 上一篇/下一篇(垫距合计 ≤5rem) ---------- */

#related-posts{
  padding-top: 2.4rem;
}

#post-nav{
  padding-top: 2.4rem;
  padding-bottom: .6rem;
}

#related-posts .block-title{
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.related-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

.related-card{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.15rem 1.1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.related-card::before{
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  border-radius: var(--radius-m) var(--radius-m) 0 0;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  opacity: 0;
  transition: opacity .2s ease;
}

.related-card:hover{
  transform: translateY(-3px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-card);
}

.related-card:hover::before{
  opacity: 1;
}

.related-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--text-muted);
}

.related-title{
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.related-summary{
  font-size: .9rem;
  line-height: 1.72;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-nav-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
}

.post-nav-link{
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--bg-panel);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.post-nav-link.is-next{
  text-align: right;
  border-left: 1px solid var(--border);
  border-right: 3px solid var(--border);
}

.post-nav-link:hover{
  transform: translateY(-2px);
  border-color: var(--accent-line);
  background: var(--blog-tint-accent);
}

.post-nav-dir{
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.post-nav-title{
  font-family: var(--font-display);
  font-size: .96rem;
  font-weight: 700;
  line-height: 1.5;
  text-wrap: pretty;
  color: var(--text);
}

/* ---------- 12. 窄屏与动效降级 ---------- */

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

  .blog-hero h1,
  .article-hero h1{
    font-size: 1.7rem;
  }

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

  .article-meta{
    justify-content: flex-start;
    text-align: left;
  }

  .article-hero{
    text-align: left;
  }

  .article-hero .hero-rule{
    margin-inline: 0;
  }

  .article-meta > * + *::before{
    margin-right: .45rem;
  }
}

@media (prefers-reduced-motion: reduce){
  .post,
  .related-card,
  .post-nav-link,
  .filter-btn,
  .post .link-arrow svg{
    transition: none;
  }

  .post:hover,
  .related-card:hover,
  .post-nav-link:hover,
  .filter-btn:hover{
    transform: none;
  }
}