/* ==========================================================================
   VPNDN · 博客样式包(列表页 + 文章页)
   颜色 / 圆角 / 字体一律取自 base.css 的 :root 令牌,组件内不写死色值
   ========================================================================== */

:root {
  --blog-read: 54rem;                            /* 正文阅读列 52~57rem */
  --blog-inline: 1.5rem;                         /* 阅读列左右内衬,hero 与正文同值 */
  --blog-col: calc(var(--blog-read) + 2 * var(--blog-inline));
}

/* --------------------------------------------------------------------------
   1. 列表页刊头(centered-formal)
   -------------------------------------------------------------------------- */
.blog-hero {
  position: relative;
  isolation: isolate;
  text-align: center;
  padding-block: clamp(2.4rem, 6vw, 4.2rem) clamp(1.4rem, 3vw, 2rem);
}

.blog-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(60% 80% at 50% 6%, color-mix(in srgb, var(--accent) 11%, transparent), transparent 72%);
}

.blog-hero .kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.blog-hero h1 {
  margin: 1rem 0 0;
  font-size: clamp(1.72rem, 4.6vw, 3rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  text-wrap: pretty;
}

.blog-hero h1::after {
  content: "";
  display: block;
  width: 3.6em;
  height: 3px;
  margin: 1.05rem auto 0;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--lime));
}

.blog-hero .lede {
  max-width: 42rem;
  margin: 1.2rem auto 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   2. 分类筛选与计数
   -------------------------------------------------------------------------- */
.blog-list {
  padding-block: 0 clamp(3rem, 7vw, 4.5rem);
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.tag-btn {
  appearance: none;
  margin: 0;
  padding: 0.5rem 1.05rem;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.tag-btn:hover {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
  transform: translateY(-1px);
}

.tag-btn.is-active {
  color: var(--ink);
  font-weight: 600;
  background: var(--accent);
  border-color: var(--accent);
}

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

.blog-count {
  margin: 1.1rem 0 clamp(1.1rem, 2.4vw, 1.6rem);
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted-2);
}

/* --------------------------------------------------------------------------
   3. 文章卡网格
   -------------------------------------------------------------------------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
  gap: clamp(1rem, 2.2vw, 1.5rem);
}

.blog-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.72rem;
  padding: clamp(1.25rem, 2.4vw, 1.6rem);
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.blog-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--lime));
  opacity: 0;
  transition: opacity 0.22s ease;
}

.blog-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
  box-shadow: var(--shadow-lift);
}

.blog-card:hover::after {
  opacity: 1;
}

.blog-card:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 3px;
}

.post-card .post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted-2);
}

.post-card .post-meta > * + * {
  position: relative;
}

.post-card .post-meta > * + *::before {
  content: "·";
  position: absolute;
  left: -0.375rem;
  top: 50%;
  transform: translate(-50%, -50%);
  line-height: 1;
  color: var(--border);
  pointer-events: none;
}

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

.post-card .tag-chip {
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent) 13%, var(--panel));
  font-weight: 600;
}

.post-card .post-title {
  margin: 0;
  font-size: clamp(1.06rem, 1.9vw, 1.22rem);
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: pretty;
}

.post-card .post-sum {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.post-card .post-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.35rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.post-card .post-more svg {
  width: 16px;
  height: 16px;
  transition: transform 0.22s ease;
}

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

.blog-empty {
  margin: 2rem 0 0;
  text-align: center;
  font-size: 0.94rem;
  color: var(--muted);
}

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

/* --------------------------------------------------------------------------
   4. 阅读列:面包屑 / 刊头 / 正文 / 文末组件共用同一条列并居中
   -------------------------------------------------------------------------- */
.reading-wrap,
.article-hero,
.article-crumbs,
.breadcrumb,
.breadcrumbs,
.crumbs,
.prose,
#related-posts,
#post-nav {
  width: 100%;
  max-width: var(--blog-col);
  margin-inline: auto;
  padding-inline: var(--blog-inline);
  box-sizing: border-box;
}

/* 已经处在阅读列内部的同名容器不再重复加衬,避免列宽被二次收窄 */
:is(.reading-wrap, .article-hero, .article-crumbs, .breadcrumb, .breadcrumbs, .crumbs, .prose, #related-posts, #post-nav) :is(.reading-wrap, .article-hero, .article-crumbs, .breadcrumb, .breadcrumbs, .crumbs, .prose, #related-posts, #post-nav) {
  max-width: none;
  width: auto;
  padding-inline: 0;
}

/* --------------------------------------------------------------------------
   5. 面包屑(与页头留呼吸空间)
   -------------------------------------------------------------------------- */
.article-crumbs,
.breadcrumb,
.breadcrumbs,
.crumbs {
  padding-block-start: clamp(1.4rem, 3vw, 2rem);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted-2);
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) :is(ol, ul) {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.1rem 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) li {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) li + li::before {
  content: "/";
  color: var(--border);
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) a:hover {
  color: var(--accent-dark);
  border-bottom-color: color-mix(in srgb, var(--accent) 55%, transparent);
}

:is(.article-crumbs, .breadcrumb, .breadcrumbs, .crumbs) [aria-current="page"] {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   6. 文章刊头(居中:kicker → H1 → 强调短线 → 居中 meta)
   -------------------------------------------------------------------------- */
.article-hero {
  position: relative;
  isolation: isolate;
  text-align: center;
  padding-block: clamp(1.5rem, 3.4vw, 2.4rem) clamp(1.8rem, 4vw, 2.6rem);
}

.article-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(62% 78% at 50% 12%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 74%);
}

.article-hero .kicker,
.article-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.article-hero h1 {
  margin: 1rem 0 0;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.28;
  letter-spacing: -0.015em;
  text-wrap: pretty;
}

.article-hero h1::after {
  content: "";
  display: block;
  width: 3.4em;
  height: 3px;
  margin: 1.05rem auto 0;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--lime));
}

.article-hero .lede,
.article-hero .article-summary {
  max-width: 44rem;
  margin: 1.15rem auto 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.article-hero :is(.post-meta, .article-meta, .hero-meta) {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin: 1.35rem 0 0;
  font-size: 0.82rem;
  color: var(--muted-2);
}

.article-hero :is(.post-meta, .article-meta, .hero-meta) > * + * {
  position: relative;
}

.article-hero :is(.post-meta, .article-meta, .hero-meta) > * + *::before {
  content: "·";
  position: absolute;
  left: -0.375rem;
  top: 50%;
  transform: translate(-50%, -50%);
  line-height: 1;
  color: var(--border);
  pointer-events: none;
}

.article-hero :is(.post-meta, .article-meta, .hero-meta) .tag-chip {
  padding: 0.18rem 0.7rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--accent);
  border-radius: var(--r-pill);
}

.article-hero :is(.post-meta, .article-meta, .hero-meta) time,
.article-hero :is(.post-meta, .article-meta, .hero-meta) .meta-pill {
  padding: 0.18rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
}

/* --------------------------------------------------------------------------
   7. 正文排版
   -------------------------------------------------------------------------- */
.prose,
.article-body,
.reading-wrap {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.prose > :first-child,
.article-body > :first-child,
.reading-wrap > :first-child {
  margin-top: 0;
}

.prose p,
.article-body p {
  margin-block: 0 1.15em;
}

:is(.prose, .article-body, .reading-wrap) h2 {
  margin-block: 2.4rem 0.9rem;
  font-size: clamp(1.26rem, 2.3vw, 1.6rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: pretty;
}

:is(.prose, .article-body, .reading-wrap) {
  counter-reset: blog-h2;
}

:is(.prose, .article-body, .reading-wrap) h2 {
  counter-increment: blog-h2;
}

:is(.prose, .article-body, .reading-wrap) h2::before {
  content: counter(blog-h2, decimal-leading-zero);
  display: inline-block;
  margin-right: 0.6em;
  padding: 0.1em 0.45em;
  font-family: var(--font-mono);
  font-size: 0.68em;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0;
  vertical-align: 0.12em;
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent) 12%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--r-sm);
}

:is(.prose, .article-body, .reading-wrap) h3 {
  margin-block: 1.8rem 0.6rem;
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--ink);
  text-wrap: pretty;
}

:is(.prose, .article-body, .reading-wrap) h3::before {
  content: "";
  display: inline-block;
  width: 0.7em;
  height: 2px;
  margin-right: 0.5em;
  vertical-align: 0.32em;
  border-radius: var(--r-pill);
  background: var(--accent);
}

:is(.prose, .article-body, .reading-wrap) :is(ul, ol):not(.check-list) {
  margin-block: 1.15rem;
  padding-left: 1.4rem;
}

:is(.prose, .article-body, .reading-wrap) :is(ul, ol):not(.check-list) > li {
  margin-block: 0.45rem;
}

:is(.prose, .article-body, .reading-wrap) :is(ul, ol):not(.check-list) > li::marker {
  color: var(--accent-dark);
}

:is(.prose, .article-body, .reading-wrap) a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.18em;
}

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

:is(.prose, .article-body, .reading-wrap) strong {
  font-weight: 700;
}

:is(.prose, .article-body, .reading-wrap) blockquote {
  margin-block: 1.5rem;
  padding: 0.2rem 0 0.2rem 1.15rem;
  color: var(--muted);
  border-left: 3px solid color-mix(in srgb, var(--accent) 50%, var(--border));
}

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

:is(.prose, .article-body, .reading-wrap) hr {
  margin-block: 2.2rem;
  border: 0;
  border-top: 1px solid var(--border);
}

/* ---- 表格:实色表头 + 斑马纹 + hover,窄屏横滑 ---- */
:is(.prose, .article-body, .reading-wrap) table {
  width: 100%;
  margin-block: 1.6rem;
  font-size: 0.95rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
}

:is(.prose, .article-body, .reading-wrap) thead th {
  padding: 0.7rem 0.85rem;
  font-weight: 600;
  text-align: left;
  color: var(--panel);
  background: var(--accent-dark);
}

:is(.prose, .article-body, .reading-wrap) td {
  padding: 0.65rem 0.85rem;
  vertical-align: top;
  border-top: 1px solid var(--border);
}

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

:is(.prose, .article-body, .reading-wrap) tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 9%, var(--panel));
}

@media (max-width: 860px) {
  :is(.prose, .article-body, .reading-wrap) table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }
  :is(.prose, .article-body, .reading-wrap) th,
  :is(.prose, .article-body, .reading-wrap) td {
    min-width: 7em;
  }
}

/* ---- 代码:终端窗 ---- */
:is(.prose, .article-body, .reading-wrap) pre {
  position: relative;
  margin-block: 1.6rem;
  padding: 2.6rem 1.1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mint);
  background: var(--ink);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}

:is(.prose, .article-body, .reading-wrap) pre::before {
  content: "";
  position: absolute;
  top: 0.95rem;
  left: 1.1rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

:is(.prose, .article-body, .reading-wrap) pre code {
  font-family: var(--font-mono);
  font-size: 1em;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
}

:is(.prose, .article-body, .reading-wrap) :not(pre) > code {
  padding: 0.12em 0.42em;
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

/* --------------------------------------------------------------------------
   8. 正文富组件
   -------------------------------------------------------------------------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: clamp(0.8rem, 1.8vw, 1.1rem);
  margin-block: 1.8rem;
}

.stat-card {
  position: relative;
  padding: 1.15rem 1.1rem 1.05rem;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
}

.stat-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--lime));
}

.stat-card:nth-child(even) {
  background: var(--panel-2);
}

.stat-card:nth-child(even)::before {
  background: linear-gradient(90deg, var(--accent-dark), var(--accent));
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent-dark);
}

.stat-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 勾叉清单:只做容器与行卡装饰,勾叉标记由正文文本自带 */
.check-list {
  display: grid;
  gap: 0.55rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: 0.72rem 1rem 0.72rem 1.05rem;
  line-height: 1.8;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: var(--r-sm);
  transition: border-left-color 0.18s ease, box-shadow 0.18s ease;
}

.check-list li:hover {
  border-left-color: var(--muted-2);
  box-shadow: var(--shadow-soft);
}

.check-list li::marker {
  content: none;
}

.verdict {
  margin-block: 1.8rem;
  padding: 1.05rem 1.2rem 1.05rem 1.35rem;
  line-height: 1.85;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  border-left: 4px solid var(--accent);
  border-radius: var(--r-md);
}

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

.callout {
  position: relative;
  margin-block: 1.6rem;
  padding: 1rem 1.15rem 1rem 3rem;
  line-height: 1.8;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-md);
}

.callout::before {
  content: "i";
  position: absolute;
  left: 0.95rem;
  top: 1.05rem;
  display: grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--accent);
  border-radius: 50%;
}

.callout-title {
  display: block;
  margin-bottom: 0.15rem;
  font-weight: 600;
  color: var(--ink);
}

.callout-warning {
  background: color-mix(in srgb, var(--warn) 8%, var(--panel));
  border-left-color: var(--warn);
}

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

.callout-success {
  background: color-mix(in srgb, var(--success) 8%, var(--panel));
  border-left-color: var(--success);
}

.callout-success::before {
  content: "✓";
  color: var(--panel);
  background: var(--success);
}

/* --------------------------------------------------------------------------
   9. 文末推广块(全站唯一,彩底重配色)
   -------------------------------------------------------------------------- */
.promo-block {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.1rem 1.6rem;
  width: 100%;
  max-width: var(--blog-read);
  margin-inline: auto;
  margin-block: clamp(2.4rem, 5vw, 3.4rem) clamp(1.6rem, 3vw, 2.2rem);
  padding: clamp(1.35rem, 3vw, 1.9rem);
  box-sizing: border-box;
  overflow: hidden;
  color: var(--panel);
  background: linear-gradient(135deg, var(--accent-deep) 0%, var(--accent-dark) 58%, var(--accent-deep) 100%);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-panel);
}

.promo-block::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(70% 120% at 100% 0%, color-mix(in srgb, var(--lime) 22%, transparent), transparent 68%);
}

.promo-brand {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--panel) 74%, var(--accent));
}

.promo-title {
  margin: 0.45rem 0 0;
  font-size: clamp(1.06rem, 2.1vw, 1.35rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--panel);
}

.promo-sub {
  margin: 0.4rem 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: color-mix(in srgb, var(--panel) 82%, var(--accent));
}

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

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

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

/* 文末推广块主按钮:footer.js 以 .promo-cta 识别站内推广点击,这里补上排版定义 */
.promo-cta {
  white-space: nowrap;
}

.promo-block .btn-secondary {
  color: var(--panel);
  background: transparent;
  border-color: color-mix(in srgb, var(--panel) 55%, transparent);
}

/* --------------------------------------------------------------------------
   10. 延伸阅读 + 上一篇 / 下一篇
   -------------------------------------------------------------------------- */
#related-posts {
  padding-block: 0;
}

#related-posts h2,
#post-nav h2 {
  counter-increment: none;
}

#related-posts h2::before,
#post-nav h2::before {
  content: none;
}

#related-posts h2 {
  margin: 0 0 1.05rem;
  font-size: clamp(1.08rem, 1.9vw, 1.28rem);
  line-height: 1.45;
}

#related-posts h2::after {
  content: "";
  display: block;
  width: 2.4rem;
  height: 2px;
  margin-top: 0.55rem;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--lime));
}

.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: clamp(0.8rem, 1.8vw, 1.1rem);
}

.rel-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.05rem 1.1rem;
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.rel-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--lime));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}

.rel-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 32%, var(--border));
  box-shadow: var(--shadow-lift);
}

.rel-card:hover::before {
  transform: scaleX(1);
}

.rel-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.6rem;
  margin: 0;
  font-size: 0.76rem;
  color: var(--muted-2);
}

.rel-meta .tag-chip {
  padding: 0.1rem 0.55rem;
  font-weight: 600;
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent) 13%, var(--panel));
  border-radius: var(--r-pill);
}

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

.rel-title {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
  text-wrap: pretty;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: clamp(0.8rem, 1.8vw, 1.1rem);
  margin-top: clamp(1.3rem, 2.6vw, 1.8rem);
  padding-bottom: clamp(2rem, 4vw, 2.6rem);
}

.postnav-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.05rem 1.15rem;
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.postnav-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--lime));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}

.postnav-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 32%, var(--border));
  box-shadow: var(--shadow-lift);
}

.postnav-card:hover::before {
  transform: scaleX(1);
}

.postnav-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent-dark);
}

.postnav-title {
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.6;
  text-wrap: pretty;
}

.postnav-date {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted-2);
}

.postnav-next {
  text-align: right;
}

.postnav-next::before {
  transform-origin: right center;
}

/* --------------------------------------------------------------------------
   11. 响应式与动效降级
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  :root {
    --blog-inline: 1rem;
  }

  .blog-hero h1 {
    font-size: clamp(1.5rem, 7vw, 2rem);
  }

  .article-hero h1 {
    font-size: clamp(1.42rem, 6.4vw, 1.9rem);
  }

  .article-hero h1::after,
  .blog-hero h1::after {
    margin-top: 0.85rem;
  }

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

  .postnav-next {
    text-align: left;
  }

  .postnav-next::before {
    transform-origin: left center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-card,
  .tag-btn,
  .rel-card,
  .postnav-card,
  .check-list li,
  .post-card .post-more svg {
    transition: none;
  }

  .blog-card:hover,
  .tag-btn:hover,
  .rel-card:hover,
  .postnav-card:hover {
    transform: none;
  }

  .rel-card::before,
  .postnav-card::before {
    transition: none;
  }

  .post-card:hover .post-more svg {
    transform: none;
  }
}