/* ============================================================
   VPNQK 博客系统样式(列表页 + 文章页)
   颜色 / 圆角 / 阴影全部取自 base.css 的设计令牌
   ============================================================ */

/* ---------- 1. 阅读列与共用变量 ---------- */
.blog-page,
.article-page {
  --blog-col: 55rem;
  --blog-pad: 1.5rem;
  --col-pad: calc(var(--gutter) + var(--blog-pad));
}

/* ---------- 2. 列表页 Hero ---------- */
.blog-hero {
  padding-top: clamp(2rem, 5vw, 3.4rem);
  padding-bottom: clamp(.6rem, 2vw, 1rem);
}

.blog-hero-card {
  position: relative;
  z-index: 0;
  overflow: hidden;
  padding-block: clamp(1.6rem, 4vw, 2.6rem);
  padding-inline: clamp(1.5rem, 4vw, 2.6rem);
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-xl, 20px);
  box-shadow: var(--shadow-card);
}

.blog-hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.blog-hero h1 {
  max-width: 20ch;
  margin: .75rem 0 .85rem;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 1.55rem + 2.6vw, 3rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
}

.blog-hero-lede {
  max-width: 46rem;
  margin: 0;
  color: var(--text-muted);
  font-size: clamp(.98rem, .95rem + .2vw, 1.06rem);
  line-height: 1.8;
}

.blog-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.1rem;
}

/* ---------- 3. 图章(列表页与文章页共用) ---------- */
.stamp {
  position: absolute;
  top: clamp(.8rem, 2vw, 1.4rem);
  right: clamp(.8rem, 2vw, 1.4rem);
  z-index: 2;
  display: grid;
  place-items: center;
  width: 4.4rem;
  height: 4.4rem;
  border: 1px solid color-mix(in srgb, var(--accent) 52%, var(--border));
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-panel));
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .08em;
  transform: rotate(-11deg);
}

.stamp::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: 50%;
}

/* ---------- 4. 筛选栏与列表状态 ---------- */
.blog-list-sec {
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}

.filter-btn {
  appearance: none;
  padding: .58rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: .88rem;
  line-height: 1;
  cursor: pointer;
  transition: color .16s ease, border-color .16s ease, background .16s ease;
}

.filter-btn:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

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

.filter-btn[aria-pressed="true"] {
  background: var(--text);
  border-color: var(--text);
  color: var(--on-ink);
}

.list-status {
  margin: 0 0 .9rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
}

/* ---------- 5. 文章卡片 ---------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(.9rem, 2vw, 1.2rem);
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: 1.35rem 1.35rem 1.15rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg, 14px);
  box-shadow: var(--shadow-card);
  color: var(--text);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
  box-shadow: var(--shadow-float);
}

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

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .76rem;
}

.post-card .tag {
  padding: .18rem .55rem;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--border-soft));
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-panel));
  color: var(--accent-dark);
  font-family: var(--font-body);
  font-size: .74rem;
  letter-spacing: .02em;
}

.post-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
  transition: color .16s ease;
}

.post-card:hover .post-title {
  color: var(--accent-dark);
}

.post-summary {
  margin: 0;
  color: var(--text-muted);
  font-size: .93rem;
  line-height: 1.72;
}

.post-more {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  margin-top: auto;
  padding-top: .3rem;
  color: var(--accent-dark);
  font-size: .86rem;
  font-weight: 600;
}

.post-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem 1.2rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-lg, 14px);
  color: var(--text-muted);
  font-size: .94rem;
  text-align: center;
}

/* ---------- 6. 文末推广卡 ---------- */
.promo-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.4rem;
  margin-top: clamp(2rem, 4vw, 2.8rem);
  padding: clamp(1.2rem, 3vw, 1.6rem) clamp(1.5rem, 4vw, 2rem);
  border-radius: var(--r-lg, 14px);
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  box-shadow: var(--shadow-card);
  color: var(--on-ink);
}

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

.promo-brand {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  color: var(--on-ink);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.01em;
}

.promo-brand img {
  padding: 2px;
  border-radius: var(--r-xs, 6px);
  background: var(--bg-panel);
}

.promo-line {
  max-width: 46rem;
  margin: .4rem 0 0;
  color: color-mix(in srgb, var(--on-ink) 88%, var(--accent));
  font-size: .94rem;
  line-height: 1.72;
}

.promo-block .btn {
  flex-shrink: 0;
}

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

.promo-block .btn-primary:hover {
  background: color-mix(in srgb, var(--bg-panel) 86%, var(--accent-soft));
}

/* ---------- 7. 面包屑 ---------- */
.article-page .breadcrumb-wrap,
.article-page .breadcrumb {
  width: 100%;
  max-width: calc(var(--blog-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--col-pad);
  box-sizing: border-box;
}

.article-page .breadcrumb-wrap {
  margin-top: 1.4rem;
}

.article-page .breadcrumb {
  margin-top: 1.4rem;
  color: var(--text-muted);
  font-size: .8rem;
  line-height: 1.6;
}

.article-page .breadcrumb-wrap .breadcrumb {
  max-width: none;
  margin-inline: 0;
  margin-top: 0;
  padding-inline: 0;
}

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

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

.breadcrumb li + li::before {
  content: "/";
  color: color-mix(in srgb, var(--text-muted) 62%, var(--bg-panel));
}

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

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

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

/* ---------- 8. 文章 Hero(图章角标卡) ---------- */
.article-page .article-hero {
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: calc(var(--blog-col) + 2 * var(--gutter));
  margin-inline: auto;
  margin-top: 1.4rem;
  padding-block: clamp(1.5rem, 3.4vw, 2.1rem);
  padding-inline: var(--col-pad);
  box-sizing: border-box;
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg, 14px);
  box-shadow: var(--shadow-card);
}

.article-page .reading-wrap .article-hero {
  max-width: none;
  margin-inline: 0;
  padding-inline: var(--blog-pad);
}

.article-page .article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .6rem;
  margin: 0 0 .85rem;
  padding-right: 4.6rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .76rem;
}

.article-page .article-meta .tag {
  padding: .2rem .6rem;
  border-color: transparent;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--on-ink);
  font-family: var(--font-body);
  font-size: .76rem;
}

.article-page .article-meta time,
.article-page .article-meta .read-time {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .22rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
}

.article-page .article-hero h1 {
  margin: 0 0 .8rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 1.35rem + 2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
}

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

/* ---------- 9. 阅读列对齐 ---------- */
.article-page .reading-wrap {
  width: 100%;
  max-width: calc(var(--blog-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.article-page .prose {
  width: 100%;
  max-width: var(--blog-col);
  margin-inline: auto;
  padding-inline: var(--blog-pad);
  box-sizing: border-box;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  counter-reset: blog-h2;
}

.article-page .reading-wrap .prose {
  max-width: none;
  margin-inline: 0;
}

.article-page #related-posts,
.article-page #post-nav {
  width: 100%;
  max-width: calc(var(--blog-col) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--col-pad);
  box-sizing: border-box;
}

.article-page .reading-wrap #related-posts,
.article-page .reading-wrap #post-nav {
  max-width: none;
  margin-inline: 0;
  padding-inline: var(--blog-pad);
}

/* ---------- 10. 正文排版 ---------- */
.article-page .prose > *:first-child {
  margin-top: 0;
}

.article-page .prose p {
  margin: 1rem 0;
}

.article-page .prose h2 {
  margin: 2.4rem 0 .8rem;
  padding-top: .2rem;
  font-family: var(--font-display);
  font-size: clamp(1.32rem, 1.16rem + .55vw, 1.6rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
  scroll-margin-top: calc(var(--header-h) + 1rem);
  counter-increment: blog-h2;
}

.article-page .prose h2::before {
  content: counter(blog-h2, decimal-leading-zero);
  display: inline-block;
  margin-right: .55em;
  padding: .08em .42em;
  border-radius: var(--r-xs, 6px);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-panel));
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: .7em;
  font-weight: 700;
  letter-spacing: 0;
  vertical-align: .12em;
}

.article-page .prose h3 {
  margin: 1.7rem 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.03rem + .3vw, 1.3rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.article-page .prose h3::before {
  content: "";
  display: inline-block;
  width: .38rem;
  height: .38rem;
  margin-right: .45rem;
  border-radius: 1px;
  background: var(--accent);
  vertical-align: .2em;
}

.article-page .prose h4 {
  margin: 1.3rem 0 .5rem;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
}

.article-page .prose ul,
.article-page .prose ol {
  margin: 1rem 0;
  padding-left: 1.35rem;
}

.article-page .prose li {
  margin: .35rem 0;
}

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

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

.article-page .prose a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 3px;
}

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

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

.article-page .prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md, 10px);
  border: 1px solid var(--border-soft);
}

.article-page .prose code {
  padding: .12em .38em;
  border-radius: var(--r-xs, 6px);
  background: var(--bg-panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: .88em;
}

.article-page .prose pre {
  position: relative;
  margin: 1.5rem 0;
  padding: 2.5rem 1.1rem 1.1rem;
  border: 1px solid color-mix(in srgb, var(--text) 78%, var(--accent));
  border-radius: var(--r-md, 10px);
  background: var(--text);
  color: var(--on-ink);
  font-size: .86rem;
  line-height: 1.7;
  overflow-x: auto;
}

.article-page .prose pre::before {
  content: "";
  position: absolute;
  top: .95rem;
  left: 1.1rem;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

.article-page .prose pre code {
  padding: 0;
  background: none;
  color: inherit;
  font-size: inherit;
}

.article-page .prose blockquote {
  margin: 1.6rem 0;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent-soft);
  border-radius: 0 var(--r-sm, 8px) var(--r-sm, 8px) 0;
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-panel));
  color: var(--text);
  font-size: .97rem;
}

.article-page .prose blockquote p:first-child {
  margin-top: 0;
}

.article-page .prose blockquote p:last-child {
  margin-bottom: 0;
}

/* ---------- 11. 正文表格(窄屏可横滑) ---------- */
.article-page .prose table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: .92rem;
  line-height: 1.6;
}

.article-page .prose caption {
  padding-bottom: .5rem;
  color: var(--text-muted);
  font-size: .82rem;
  text-align: left;
}

.article-page .prose thead th {
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-panel));
  color: var(--text);
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
}

.article-page .prose th,
.article-page .prose td {
  padding: .6rem .7rem;
  border-bottom: 1px solid var(--border-soft);
  word-break: keep-all;
}

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

.article-page .prose tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 7%, var(--bg-panel));
}

.article-page .prose .table-scroll {
  margin: 1.5rem 0;
  overflow-x: auto;
}

.article-page .prose .table-scroll table {
  margin: 0;
  min-width: 34rem;
}

/* ---------- 12. 数据卡 ---------- */
.article-page .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: .8rem;
  margin: 1.5rem 0;
}

.article-page .stat-card {
  position: relative;
  overflow: hidden;
  padding: 1.05rem 1rem .95rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md, 10px);
  background: var(--bg-panel);
}

.article-page .stat-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent);
}

.article-page .stat-card:nth-child(2n) {
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-panel));
}

.article-page .stat-card:nth-child(2n)::before {
  background: var(--accent-dark);
}

.article-page .stat-num {
  display: block;
  color: var(--accent-dark);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
}

.article-page .stat-label {
  display: block;
  margin-top: .2rem;
  color: var(--text-muted);
  font-size: .82rem;
  line-height: 1.55;
}

/* ---------- 13. 勾叉清单(只做容器,不注入符号) ---------- */
.article-page .check-list {
  display: grid;
  gap: .55rem;
  margin: 1.4rem 0;
  padding: 0;
  list-style: none;
}

.article-page .check-list li {
  margin: 0;
  padding: .7rem .9rem .7rem 1rem;
  border: 1px solid var(--border-soft);
  border-left: 3px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: var(--r-sm, 8px);
  background: var(--bg-panel);
  font-size: .95rem;
  line-height: 1.72;
}

/* ---------- 14. 结论块 ---------- */
.article-page .verdict {
  margin: 1.5rem 0;
  padding: .95rem 1.1rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--r-sm, 8px);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-panel));
  font-size: .96rem;
  line-height: 1.8;
}

.article-page .verdict strong:first-child {
  color: var(--accent-dark);
}

/* ---------- 15. Callout ---------- */
.article-page .callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1rem 1.1rem 1rem 3rem;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border-soft));
  border-left: 3px solid var(--accent);
  border-radius: var(--r-sm, 8px);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-panel));
  font-size: .95rem;
  line-height: 1.75;
}

.article-page .callout::before {
  content: "i";
  position: absolute;
  top: 1rem;
  left: .95rem;
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
}

.article-page .callout.is-warn {
  border-color: color-mix(in srgb, var(--warn) 30%, var(--border-soft));
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 8%, var(--bg-panel));
}

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

.article-page .callout.is-ok {
  border-color: color-mix(in srgb, var(--success) 30%, var(--border-soft));
  border-left-color: var(--success);
  background: color-mix(in srgb, var(--success) 8%, var(--bg-panel));
}

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

.article-page .callout-title {
  display: block;
  margin-bottom: .25rem;
  font-weight: 700;
  color: var(--text);
}

/* ---------- 16. 延伸阅读 ---------- */
.article-page #related-posts {
  margin-top: 2.6rem;
}

.related-title {
  margin: 0 0 1rem;
  padding-left: .7rem;
  border-left: 3px solid var(--accent);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
}

.related-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1rem 1rem .95rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md, 10px);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.related-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  border-radius: var(--r-md, 10px) var(--r-md, 10px) 0 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity .18s ease;
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
  box-shadow: var(--shadow-card);
}

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

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

.related-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .72rem;
}

.related-meta .tag {
  padding: .16rem .5rem;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--border-soft));
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--accent) 9%, var(--bg-panel));
  color: var(--accent-dark);
  font-family: var(--font-body);
  font-size: .72rem;
}

.related-card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.005em;
  color: var(--text);
  text-wrap: pretty;
}

.related-card-summary {
  margin: 0;
  color: var(--text-muted);
  font-size: .86rem;
  line-height: 1.7;
}

/* ---------- 17. 上一篇 / 下一篇 ---------- */
.article-page #post-nav {
  margin-top: 1.8rem;
}

.post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  padding-bottom: 1.4rem;
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: .95rem 1rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md, 10px);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease;
}

.post-nav-link:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.post-nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.post-nav-link.is-next {
  align-items: flex-end;
  text-align: right;
}

.post-nav-label {
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
}

.post-nav-title {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.5;
}

.post-nav-date {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .72rem;
}

/* ---------- 18. 文章页悬浮 CTA(仅文章页使用) ---------- */
.float-cta {
  position: fixed;
  right: clamp(.75rem, 3vw, 1.75rem);
  bottom: clamp(.75rem, 3vw, 1.75rem);
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  max-width: calc(100vw - 1.5rem);
  padding: .7rem 1.1rem;
  border-radius: var(--r-pill);
  background: var(--text);
  box-shadow: var(--shadow-float);
  color: var(--on-ink);
  font-size: .92rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform .18s ease, background .18s ease;
}

.float-cta:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
}

.float-cta svg {
  flex-shrink: 0;
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1024px) {
  .post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .post-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .article-page .prose {
    padding-inline: 0;
  }

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

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

  .post-nav-link.is-next {
    align-items: flex-start;
    text-align: left;
  }

  .float-cta {
    right: .7rem;
    bottom: .7rem;
    padding: .6rem .9rem;
    font-size: .84rem;
  }

  .article-page {
    padding-bottom: 3.6rem;
  }
}

@media (max-width: 560px) {
  .stamp {
    width: 3.3rem;
    height: 3.3rem;
    font-size: .72rem;
  }

  .article-page .article-meta {
    padding-right: 3.6rem;
  }

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

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

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .post-card,
  .filter-btn,
  .related-card,
  .post-nav-link,
  .float-cta {
    transition: none;
  }

  .post-card:hover,
  .related-card:hover,
  .post-nav-link:hover,
  .float-cta:hover {
    transform: none;
  }
}