/* VPNDU · 博客列表页与文章页专属样式
   主题:清晰度应答台 / 图章角标卡(blogHeroStyle = stamp-corner)
   所有颜色均来自 base.css 的设计令牌,组件内不写死色值。 */

:root {
  --reading-col: 54rem;
  --reading-gutter: var(--gutter);
  --reading-box: calc(var(--reading-col) + 2 * var(--reading-gutter));
}

/* ---------- 通用阅读列 ---------- */

.reading-wrap {
  width: 100%;
  max-width: var(--reading-box);
  margin-inline: auto;
  padding-inline: var(--reading-gutter);
  box-sizing: border-box;
}

/* ---------- 列表页 Hero:图章角标卡 ---------- */

.blog-hero {
  padding-block: calc(var(--sec-y) + 8px) var(--sec-y);
}

.stamp-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 2.25rem 2rem 2rem;
  padding-inline: 2rem;
  overflow: hidden;
}

.stamp-card::after {
  content: attr(data-stamp);
  position: absolute;
  top: 1.35rem;
  right: 1.35rem;
  width: 6.6rem;
  height: 6.6rem;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 0.6rem;
  box-sizing: border-box;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.35;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
  transform: rotate(-11deg);
  opacity: 0.86;
  pointer-events: none;
  background:
    radial-gradient(circle, transparent 62%, rgba(var(--accent-rgb), 0.08) 63%);
}

.stamp-card::before {
  content: "";
  position: absolute;
  top: 1.85rem;
  right: 1.85rem;
  width: 5.6rem;
  height: 5.6rem;
  border: 1px dashed rgba(var(--accent-rgb), 0.45);
  border-radius: 50%;
  transform: rotate(-11deg);
  pointer-events: none;
}

.blog-hero-card .post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.75rem;
  margin: 0 0 1rem;
}

.blog-hero-card h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: pretty;
  margin: 0 0 1rem;
  max-width: 34rem;
}

.blog-hero-lede {
  color: var(--text-muted);
  font-size: 1.03rem;
  line-height: 1.85;
  margin: 0 0 1.6rem;
  max-width: 44rem;
}

.blog-hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.blog-hero-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-panel2);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}

.fact-k {
  font-size: 0.76rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.fact-v {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text);
}

/* ---------- 列表页筛选 ---------- */

.blog-list-sec {
  padding-top: 0;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.9rem 1.4rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.4rem;
}

.filter-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  letter-spacing: -0.01em;
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-btn {
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.42rem 0.95rem;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.tag-btn:hover {
  color: var(--accent-dark);
  border-color: rgba(var(--accent-rgb), 0.4);
}

.tag-btn.is-on {
  color: var(--bg-panel);
  background: var(--accent);
  border-color: var(--accent);
}

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

.filter-status {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0 0 1.4rem;
}

/* ---------- 文章卡 ---------- */

.post-list {
  display: grid;
  gap: 1.15rem;
}

.post-card {
  display: block;
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.6rem 1.4rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.post-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--grad-band);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--accent-rgb), 0.38);
  box-shadow: var(--shadow-accent);
}

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

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

.post-card h3 {
  font-family: var(--font-display);
  font-size: 1.24rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.015em;
  color: var(--text);
  margin: 0.75rem 0 0.55rem;
  text-wrap: pretty;
}

.post-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  margin: 0 0 0.95rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.7rem;
}

.badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--bg-panel);
  background: var(--accent);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
}

.meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border);
  display: inline-block;
}

.meta-plain {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-dark);
}

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

.post-empty {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 1.6rem 0;
}

.post-list-fallback {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 2;
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  margin-top: 1.5rem;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--border);
  font-family: var(--font-mono);
}

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

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

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

/* ---------- 文章 Hero(stamp-corner) ---------- */

.article-hero {
  padding-block: 1.6rem 2rem;
}

.article-hero .stamp-card {
  padding: 2.1rem 2rem 2rem;
  padding-inline: 2rem;
}

.article-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: pretty;
  margin: 0.85rem 0 0.9rem;
  max-width: 40rem;
}

.article-lede {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.9;
  margin: 0;
  max-width: 44rem;
}

.article-hero .post-meta {
  justify-content: flex-start;
}

.meta-badge-outline {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  background: var(--bg-panel2);
}

/* ---------- 正文排版 ---------- */

.article-body {
  max-width: var(--reading-box);
  margin-inline: auto;
  padding-block: 0.6rem 0;
}

.prose {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.9;
}

.prose > p,
.prose > ul,
.prose > ol,
.prose > blockquote,
.prose > .callout,
.prose > .stat-grid,
.prose > .check-list,
.prose > .verdict,
.prose > pre,
.prose > .table-scroll,
.prose > h2,
.prose > h3 {
  margin-inline: 0;
}

.prose p {
  margin: 0 0 1.15rem;
  text-wrap: pretty;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--text);
  text-wrap: pretty;
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.prose h2::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.4rem;
  height: 2px;
  background: var(--grad-band);
  border-radius: var(--radius-pill);
}

.prose h2 .h2-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  display: inline-block;
  margin-right: 0.5rem;
  vertical-align: 0.12em;
}

.prose h3 {
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
  text-wrap: pretty;
  margin: 1.9rem 0 0.7rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
}

.prose li {
  margin-bottom: 0.5rem;
  line-height: 1.85;
}

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

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

.prose a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.prose blockquote {
  margin: 1.4rem 0;
  padding: 0.9rem 1.2rem;
  border-left: 3px solid var(--cyan);
  background: var(--bg-panel);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-muted);
}

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

/* 表格 */

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 0 0 1.4rem;
}

.prose thead th {
  background: var(--text);
  color: var(--bg-panel);
  font-weight: 600;
  text-align: left;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--text);
  white-space: nowrap;
}

.prose tbody td {
  padding: 0.62rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  word-break: keep-all;
}

.prose tbody tr:nth-child(even) td {
  background: var(--bg-panel);
}

.prose tbody tr:hover td {
  background: var(--bg-panel2);
  color: var(--text);
}

.table-scroll {
  overflow-x: auto;
  max-width: 100%;
  margin: 0 0 1.4rem;
}

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

/* 代码 / 终端窗 */

.prose pre {
  background: var(--text);
  color: var(--bg-panel);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.1rem 1.1rem;
  overflow-x: auto;
  max-width: 100%;
  margin: 0 0 1.4rem;
  position: relative;
  font-size: 0.85rem;
  line-height: 1.75;
}

.prose pre::before {
  content: "";
  position: absolute;
  top: 0.62rem;
  left: 0.9rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

.prose pre code {
  font-family: var(--font-mono);
  color: inherit;
  background: none;
  padding: 0;
  display: block;
  padding-top: 0.45rem;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-panel2);
  border-radius: 4px;
  padding: 0.12em 0.38em;
  overflow-wrap: anywhere;
}

/* callout */

.callout {
  display: block;
  position: relative;
  margin: 1.4rem 0;
  padding: 1rem 1.15rem 1rem 3rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout::before {
  content: "i";
  position: absolute;
  left: 0.85rem;
  top: 0.95rem;
  width: 1.5rem;
  height: 1.5rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--bg-panel);
  background: var(--accent);
  border-radius: 50%;
}

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

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

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

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

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

/* 数据卡网格 */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
}

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

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

.stat-card.is-cyan::before {
  background: linear-gradient(120deg, var(--cyan), var(--accent));
}

.stat-card.is-plain {
  background: var(--bg-panel2);
}

.stat-card.is-plain::before {
  background: var(--accent-dark);
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent-dark);
  line-height: 1.2;
  margin-bottom: 0.35rem;
}

.stat-card.is-cyan .stat-num {
  color: var(--cyan-ink);
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* 勾叉清单:勾叉由文本开头携带,样式不注入任何语义标记 */

.check-list {
  list-style: none;
  margin: 1.4rem 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.check-list li {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 0.95rem;
  margin: 0;
  line-height: 1.8;
  color: var(--text-muted);
}

.check-list li strong {
  color: var(--text);
}

/* 结论块 */

.verdict {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-muted);
  line-height: 1.85;
}

.verdict strong {
  color: var(--accent-dark);
  font-weight: 700;
}

/* ---------- 文末推广卡 ---------- */

.promo-block {
  position: relative;
  margin: 2.4rem 0 0;
  padding: 1.7rem 1.6rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent-dark), var(--accent) 52%, var(--cyan-ink));
  color: var(--bg-panel);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.1rem 1.6rem;
  overflow: hidden;
}

.promo-block::before {
  content: "";
  position: absolute;
  inset: auto -3rem -4rem auto;
  width: 11rem;
  height: 11rem;
  border: 1px solid rgba(var(--white-rgb), 0.28);
  border-radius: 50%;
  pointer-events: none;
}

.promo-copy {
  position: relative;
  max-width: 34rem;
}

.promo-copy h3 {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 0.45rem;
  color: var(--bg-panel);
}

.promo-copy p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(var(--white-rgb), 0.88);
}

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

.promo-block .btn-primary:hover {
  background: var(--bg-panel2);
  color: var(--accent-dark);
}

.promo-block .btn-ghost {
  color: var(--bg-panel);
  border-color: rgba(var(--white-rgb), 0.55);
  position: relative;
}

.promo-block .btn-ghost:hover {
  border-color: var(--bg-panel);
  color: var(--bg-panel);
}

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

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

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

.related-title,
.post-nav-title-head {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0 0 1.1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.related-title::after,
.post-nav-title-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 2.6rem;
  height: 2px;
  background: var(--grad-band);
  border-radius: var(--radius-pill);
}

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

.related-card {
  position: relative;
  display: block;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.15rem 1rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--grad-band);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--accent-rgb), 0.38);
  box-shadow: var(--shadow-soft);
}

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

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

.related-card .post-meta {
  gap: 0.45rem 0.6rem;
}

.related-card h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--text);
  text-wrap: pretty;
  margin: 0.65rem 0 0.45rem;
}

.related-card p {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-muted);
  margin: 0 0 0.8rem;
}

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

.post-nav-link {
  position: relative;
  display: block;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.05rem 1.15rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.post-nav-link:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--accent-rgb), 0.4);
}

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

.post-nav-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
  margin-bottom: 0.4rem;
}

.post-nav-link.is-next .post-nav-label {
  color: var(--cyan-ink);
}

.post-nav-title {
  display: block;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text);
  text-wrap: pretty;
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .blog-hero {
    padding-block: calc(var(--sec-y) + 4px) calc(var(--sec-y) - 8px);
  }
}

@media (max-width: 640px) {
  :root {
    --reading-gutter: 16px;
  }

  .stamp-card {
    padding: 1.6rem 1.25rem 1.5rem;
    padding-inline: 1.25rem;
  }

  .article-hero .stamp-card {
    padding: 1.5rem 1.25rem 1.4rem;
    padding-inline: 1.25rem;
  }

  .stamp-card::after {
    width: 4.6rem;
    height: 4.6rem;
    font-size: 0.56rem;
    top: 0.9rem;
    right: 0.9rem;
  }

  .stamp-card::before {
    width: 3.8rem;
    height: 3.8rem;
    top: 1.3rem;
    right: 1.3rem;
  }

  .blog-hero-card h1 {
    max-width: 12rem;
  }

  .article-hero h1 {
    max-width: 100%;
  }

  .post-card {
    padding: 1.25rem 1.15rem 1.15rem;
  }

  .promo-block {
    padding: 1.4rem 1.25rem;
  }
}

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

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