/* ==========================================================================
   VPNAY · 博客样式包(列表页 + 文章页)
   颜色 / 字体 / 圆角 / 投影一律引用 :root 设计令牌
   ========================================================================== */

:root {
  --reading-col: 54rem;
  --blog-pad: max(var(--gutter), 1.5rem);
}

/* ---------- 1. 阅读列与容器 ---------- */

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

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

.blog-wrap {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--wrap) + 2 * var(--blog-pad));
  margin-inline: auto;
  padding-inline: var(--blog-pad);
}

/* ---------- 2. 刊头共用(居中刊头) ---------- */

.blog-hero,
.article-hero {
  position: relative;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.blog-hero::after,
.article-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 1px;
  background: var(--border);
  pointer-events: none;
}

.kicker {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--accent);
}

.kicker::before {
  content: "";
  display: inline-block;
  width: .45em;
  height: .45em;
  margin-right: .62em;
  border: 1.5px solid var(--accent);
  transform: rotate(45deg);
  vertical-align: .08em;
}

.blog-hero h1,
.article-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.22;
  color: var(--ink);
  text-wrap: pretty;
}

.blog-hero h1 {
  font-size: clamp(1.9rem, 1.4rem + 2.2vw, 3rem);
  letter-spacing: -.02em;
}

.article-hero h1 {
  font-size: clamp(1.75rem, 1.35rem + 1.9vw, 2.6rem);
  letter-spacing: -.015em;
}

.blog-hero h1::after,
.article-hero h1::after {
  content: "";
  display: block;
  width: 3.4em;
  height: 3px;
  margin: 1rem auto 0;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

/* ---------- 3. 列表页刊头 ---------- */

.blog-hero {
  padding-block: clamp(2rem, 5vw, 3rem) clamp(1.6rem, 4vw, 2.2rem);
}

.blog-hero-desc {
  max-width: 42rem;
  margin: 1.1rem auto 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.blog-hero-meta {
  margin: .9rem 0 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .05em;
  color: var(--muted);
}

/* ---------- 4. 筛选按钮 ---------- */

.blog-list-sec {
  padding-block: clamp(1.8rem, 4vw, 2.6rem) clamp(3rem, 6vw, 4.5rem);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .5rem;
  margin-bottom: clamp(1.4rem, 3vw, 2rem);
}

.filter-btn {
  min-height: 36px;
  padding: .4rem 1.05rem;
  font: inherit;
  font-size: .88rem;
  line-height:  line-height: 1.2;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease, transform .18s ease;
}

.filter-btn:hover {
  color: var(--accent);
  border-color: var(--accent-22);
  transform: translateY(-1px);
}

.filter-btn[aria-pressed="true"] {
  color: var(--accent-dark);
  font-weight: 600;
  background: var(--accent-08);
  border-color: var(--accent-22);
}

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

/* ---------- 5. 文章卡片列表 ---------- */

.post-list {
  display: grid;
  gap: 1rem;
}

.post-card {
  position: relative;
  display: grid;
  gap: .55rem;
  padding: 1.35rem 1.5rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-soft);
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

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

.post-card::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .22s ease;
}

.post-card:hover,
.post-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent-22);
  box-shadow: var(--shadow-panel);
}

.post-card:hover::before,
.post-card:focus-visible::before {
  transform: scaleY(1);
}

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

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
  color: var(--muted);
}

.post-tag {
  padding: .16rem .62rem;
  font-family: var(--font-body);
  font-size: .76rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--accent-dark);
  background: var(--accent-08);
  border: 1px solid var(--accent-22);
  border-radius: var(--r-pill);
}

.post-tag[data-tag="guide"] {
  color: color-mix(in srgb, var(--success) 82%, var(--ink));
  background: color-mix(in srgb, var(--success) 12%, var(--panel));
  border-color: color-mix(in srgb, var(--success) 32%, transparent);
}

.post-tag[data-tag="streaming"] {
  color: color-mix(in srgb, var(--error) 80%, var(--ink));
  background: color-mix(in srgb, var(--error) 11%, var(--panel));
  border-color: color-mix(in srgb, var(--error) 30%, transparent);
}

.post-tag[data-tag="security"] {
  color: color-mix(in srgb, var(--warn) 78%, var(--ink));
  background: color-mix(in srgb, var(--warn) 13%, var(--panel));
  border-color: color-mix(in srgb, var(--warn) 32%, transparent);
}

.post-tag[data-tag="network"] {
  color: color-mix(in srgb, var(--accent-2) 74%, var(--ink));
  background: color-mix(in srgb, var(--accent-2) 12%, var(--panel));
  border-color: color-mix(in srgb, var(--accent-2) 32%, transparent);
}

.post-tag[data-tag="news"] {
  color: var(--muted);
  background: var(--panel-2);
  border-color: var(--border);
}

.post-title {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--ink);
  text-wrap: pretty;
}

.post-sum {
  font-size: .95rem;
  line-height: 1.8;
  color: var(--muted);
}

.post-more {
  margin-top: .15rem;
  font-size: .88rem;
  font-weight: 600;
  color: var(--accent);
}

.post-card:hover .post-more {
  text-decoration: underline;
  text-underline-offset: .2em;
}

.post-empty {
  margin: 2rem 0 0;
  text-align: center;
  font-size: .95rem;
  color: var(--muted);
}

/* ---------- 6. 面包屑(与页头留呼吸空间) ---------- */

.crumbs {
  padding-top: 1.75rem;
  padding-bottom: 1.5rem;
  font-size: .85rem;
  color: var(--muted);
}

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

.crumbs li {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
}

.crumbs li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--doodle);
}

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

.crumbs a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: .2em;
}

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

.crumbs a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* ---------- 7. 文章刊头(居中刊头 + 双线母题) ---------- */

.article-hero {
  padding-block: 1.4rem 2.2rem;
  background: linear-gradient(180deg, var(--veil-2), transparent 72%);
}

.article-hero .article-sum {
  max-width: 46rem;
  margin: 1.15rem auto 0;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--muted);
}

.article-hero .post-meta {
  justify-content: center;
  margin-top: 1.2rem;
  font-size: .8rem;
}

.article-hero .post-meta > .post-date::before,
.article-hero .post-meta > .post-read::before {
  content: "·";
  margin-right: .55rem;
  color: var(--doodle);
}

.article-hero .post-read {
  font-family: var(--font-mono);
  color: var(--muted);
}

/* ---------- 8. 正文排版 ---------- */

.article-body {
  counter-reset: sec;
  padding-block: clamp(1.6rem, 3.5vw, 2.2rem) 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
  overflow-wrap: break-word;
}

.article-body > p {
  margin: 0 0 1.35em;
}

.article-body h2 {
  counter-increment: sec;
  position: relative;
  margin: 2.6rem 0 1rem;
  padding-top: 1.55rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--ink);
  text-wrap: pretty;
}

.article-body h2::before {
  content: "";
  position: absolute;
  top: .4rem;
  left: 0;
  width: 2.2em;
  height: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.article-body h2::after {
  content: counter(sec, decimal-leading-zero);
  position: absolute;
  top: .18rem;
  left: 3.1em;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--doodle);
}

.article-body h3 {
  position: relative;
  margin: 2rem 0 .7rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  text-wrap: pretty;
}

.article-body h3::before {
  content: "";
  display: inline-block;
  width: .48em;
  height: .48em;
  margin-right: .6em;
  border: 2px solid var(--accent-2);
  border-radius: 2px;
  transform: rotate(45deg) translateY(-.1em);
  vertical-align: middle;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.4em;
  padding-left: 1.35em;
}

.article-body li {
  margin-bottom: .5em;
}

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

.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}

.article-body a:hover {
  color: var(--accent-dark);
}

.article-body a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.article-body strong {
  font-weight: 700;
}

.article-body hr {
  margin: 2.2rem 0;
  border: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--doodle) 0 6px, transparent 6px 12px);
}

.article-body figure {
  margin: 1.6rem 0;
}

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

.article-body figcaption {
  margin-top: .6rem;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--muted);
  text-align: center;
}

.article-body blockquote {
  position: relative;
  margin: 1.6rem 0;
  padding: 1rem 1.2rem 1rem 1.5rem;
  background: color-mix(in srgb, var(--accent) 5%, var(--panel));
  border-left: 3px solid var(--accent-2);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

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

.article-body code {
  padding: .12em .42em;
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow-wrap: anywhere;
}

.article-body pre {
  position: relative;
  margin: 1.6rem 0;
  padding: 2.5rem 1.2rem 1.2rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .86rem;
  line-height: 1.75;
  color: var(--on-dark);
  background: var(--ink-deep);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-device);
}

.article-body pre code {
  padding: 0;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  border-radius: 0;
  overflow-wrap: normal;
}

.article-body pre::before {
  content: "";
  position: absolute;
  top: .95rem;
  left: 1.1rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 16px 0 0 var(--warn), 32px 0 0 var(--success);
}

/* ---------- 9. 正文表格(窄屏可横滑) ---------- */

.article-body .table-scroll {
  margin: 1.6rem 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  line-height: 1.7;
}

.article-body thead th {
  padding: .72rem .9rem;
  text-align: left;
  font-size: .86rem;
  font-weight: 700;
  color: var(--on-dark);
  background: var(--ink-deep);
  white-space: nowrap;
}

.article-body tbody td {
  padding: .7rem .9rem;
  color: var(--ink);
  vertical-align: top;
  word-break: keep-all;
}

.article-body tbody tr + tr td {
  border-top: 1px solid var(--border);
}

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

.article-body tbody tr:hover {
  background: var(--accent-08);
}

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

/* ---------- 10. 提示框 / 数据卡 / 清单 / 结论块 ---------- */

.article-body .callout {
  position: relative;
  margin: 1.6rem 0;
  padding: 1rem 1.2rem 1rem 3.2rem;
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.article-body .callout::before {
  content: "i";
  position: absolute;
  top: 1.05rem;
  left: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  color: var(--panel);
  background: var(--accent);
  border-radius: 50%;
}

.article-body .callout b {
  display: block;
  margin-bottom: .25rem;
  color: var(--accent-dark);
}

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

.article-body .callout.is-warn {
  background: color-mix(in srgb, var(--warn) 9%, var(--panel));
  border-left-color: var(--warn);
}

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

.article-body .callout.is-warn b {
  color: color-mix(in srgb, var(--warn) 76%, var(--ink));
}

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

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

.article-body .callout.is-ok b {
  color: color-mix(in srgb, var(--success) 78%, var(--ink));
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: .9rem;
  margin: 1.6rem 0;
}

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

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.stat-card:nth-child(3n+2) {
  background: color-mix(in srgb, var(--accent) 5%, var(--panel));
}

.stat-card:nth-child(3n+2)::before {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}

.stat-card:nth-child(3n) {
  background: color-mix(in srgb, var(--success) 7%, var(--panel));
}

.stat-card:nth-child(3n)::before {
  background: linear-gradient(90deg, var(--success), var(--accent-2));
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--accent-dark);
}

.stat-card:nth-child(3n) .stat-num {
  color: color-mix(in srgb, var(--success) 80%, var(--ink));
}

.stat-label {
  display: block;
  margin-top: .3rem;
  font-size: .86rem;
  line-height: 1.65;
  color: var(--muted);
}

.check-list {
  display: grid;
  gap: .55rem;
  margin: 1.6rem 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: .7rem .95rem;
  font-size: .96rem;
  line-height: 1.78;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: border-color .18s ease, background-color .18s ease;
}

.check-list li:hover {
  border-color: var(--accent-22);
  background: color-mix(in srgb, var(--accent) 3%, var(--panel));
}

.verdict {
  position: relative;
  margin: 1.7rem 0;
  padding: 1.05rem 1.2rem 1.05rem 1.45rem;
  font-size: .98rem;
  line-height: 1.85;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

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

/* ---------- 11. 文末推广卡 ---------- */

.promo-block {
  box-sizing: border-box;
  width: calc(100% - 2 * var(--blog-pad));
  max-width: var(--reading-col);
  margin: clamp(2.2rem, 4.5vw, 3rem) auto 0;
  color: var(--on-dark);
  background: linear-gradient(135deg, var(--accent-dark), var(--accent) 58%, var(--accent-2));
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-accent);
  overflow: hidden;
}

.promo-in {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  padding: clamp(1.3rem, 3vw, 1.9rem);
}

.promo-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--on-dark);
}

.promo-line {
  margin: .4rem 0 0;
  font-size: .95rem;
  line-height: 1.75;
  color: color-mix(in srgb, var(--on-dark) 86%, transparent);
}

.promo-block .btn-primary {
  color: var(--accent-dark);
  background: var(--panel);
  box-shadow: none;
}

.promo-block .btn-primary:hover {
  background: color-mix(in srgb, var(--panel) 88%, var(--accent-2));
}

.promo-block .btn-ghost {
  color: var(--on-dark);
  border-color: color-mix(in srgb, var(--on-dark) 62%, transparent);
}

/* ---------- 12. 延伸阅读 / 上下篇 ---------- */

#related-posts {
  padding-top: .5rem;
}

#related-posts:empty,
#post-nav:empty {
  display: none;
}

#related-posts .block-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
  text-wrap: pretty;
}

#related-posts .block-title::after {
  content: "";
  display: block;
  width: 2.4em;
  height: 2px;
  margin-top: .6rem;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .9rem;
}

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

.related-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 1.15rem;
  right: 1.15rem;
  height: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s ease;
}

.related-card:hover,
.related-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent-22);
  box-shadow: var(--shadow-panel);
}

.related-card:hover::after,
.related-card:focus-visible::after {
  transform: scaleX(1);
}

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

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

.related-sum {
  font-size: .88rem;
  line-height: 1.75;
  color: var(--muted);
}

#post-nav {
  padding-block: 1.6rem clamp(2rem, 4.5vw, 2.6rem);
}

.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: .9rem;
}

.post-nav-card {
  position: relative;
  display: grid;
  gap: .45rem;
  padding: 1.1rem 1.2rem;
  color: inherit;
  text-decoration: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.post-nav-card.is-next {
  text-align: right;
}

.post-nav-card:hover,
.post-nav-card:focus-visible {
  transform: translateY(-2px);
  background: var(--panel);
  border-color: var(--accent-22);
}

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

.post-nav-label {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--accent);
}

.post-nav-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  text-wrap: pretty;
}

.post-nav-date {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--muted);
}

/* ---------- 13. 响应式 ---------- */

@media (max-width: 900px) {
  :root {
    --reading-col: 100%;
  }

  .blog-hero h1,
  .article-hero h1 {
    letter-spacing: -.01em;
  }
}

@media (max-width: 640px) {
  .blog-hero {
    padding-block: 1.8rem 1.4rem;
  }

  .blog-hero-desc,
  .article-hero .article-sum {
    font-size: .96rem;
    line-height: 1.85;
  }

  .filter-row {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: .4rem;
    -webkit-overflow-scrolling: touch;
  }

  .filter-btn {
    flex: 0 0 auto;
  }

  .post-card {
    padding: 1.15rem 1.15rem 1.1rem;
  }

  .post-title {
    font-size: 1.08rem;
  }

  .article-body h2 {
    font-size: 1.35rem;
  }

  .article-body h3 {
    font-size: 1.15rem;
  }

  .article-body pre {
    padding: 2.3rem .95rem 1rem;
    font-size: .8rem;
  }

  .article-body .callout {
    padding: 1rem 1rem 1rem 2.85rem;
  }

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

  .post-nav-card.is-next {
    text-align: left;
  }

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

/* ---------- 14. 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .filter-btn,
  .post-card,
  .related-card,
  .post-nav-card,
  .check-list li {
    transition: none;
  }

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

  .post-card::before,
  .related-card::after {
    transition: none;
  }
}