/* ============================================
   VPNCU · 博客系统专属样式
   (博客列表页 + 文章页)
   ============================================ */

/* ---------- 变量补充 ---------- */
:root {
  --reading-col: 56rem;
  --reading-wrap: calc(var(--reading-col) + 2 * var(--gutter));
}

/* ---------- 列表页 Hero ---------- */
.blog-hero {
  text-align: center;
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 5vw, 3rem);
  padding-inline: var(--gutter);
}

.blog-hero .kicker {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  color: var(--accent-dark);
  margin-bottom: 0.8rem;
  display: inline-block;
}

.blog-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.25;
  color: var(--ink);
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin-bottom: 0.9rem;
}

.blog-hero .blog-sub {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 40rem;
  margin-inline: auto;
  line-height: 1.7;
}

/* ---------- 标签筛选 ---------- */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin: 0 0 2.5rem;
}

.tag-btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

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

.tag-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

/* ---------- 文章卡 ---------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.post-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.5rem;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  height: 100%;
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--accent);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.post-tag {
  background: color-mix(in srgb, var(--accent) 12%, var(--panel));
  color: var(--accent-dark);
  border-radius: var(--r-pill);
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
}

.post-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  margin-bottom: 0.6rem;
}

.post-summary {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 1rem;
}

.post-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.post-empty {
  text-align: center;
  color: var(--muted);
  padding: 2rem 0;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: var(--reading-wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}

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

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

.breadcrumb li + li::before {
  content: "›";
  margin-right: 0.5rem;
  color: var(--border);
}

/* ---------- 阅读列(文章页 Hero 与正文共用) ---------- */
.article-hero,
.reading-wrap,
.article-body,
.promo-block,
#related-posts,
#post-nav {
  max-width: var(--reading-wrap);
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 文章页 Hero(centered-formal) ---------- */
.article-hero {
  text-align: center;
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.article-hero .article-kicker {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  color: var(--accent-dark);
  margin-bottom: 1rem;
  display: inline-block;
}

.article-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.article-hero .article-rule {
  width: 3.5em;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 1.4rem auto 1.2rem;
}

.article-hero .article-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--muted);
}

.article-meta .meta-sep::before {
  content: "·";
  margin: 0 0.25rem;
  color: var(--border);
}

/* ---------- 文章正文排版 ---------- */
.article-body {
  counter-reset: h2counter;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
  letter-spacing: normal;
}

.article-body p {
  margin: 0 0 1.25em;
}

.article-body h2 {
  font-size: 1.6rem;
  line-height: 1.4;
  margin-top: 2.5em;
  margin-bottom: 0.8em;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  counter-increment: h2counter;
}

.article-body h2::before {
  content: counter(h2counter, decimal-leading-zero) ".";
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  margin-right: 0.6rem;
}

.article-body h3 {
  font-size: 1.3rem;
  line-height: 1.4;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  letter-spacing: -0.005em;
  text-wrap: pretty;
}

.article-body ul,
.article-body ol {
  margin: 1.25em 0;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5em;
}

.article-body a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 3px;
}

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

.article-body blockquote {
  border-left: 3px solid var(--border);
  padding: 0.5rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--muted);
  font-style: italic;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: color-mix(in srgb, var(--panel2) 60%, var(--panel));
  border-radius: 4px;
  padding: 0.15em 0.4em;
  color: var(--accent-dark);
}

/* ---------- 表格 ---------- */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 1.5rem 0;
  min-width: 640px;
}

.article-body thead th {
  background: var(--panel2);
  color: var(--ink);
  font-weight: 700;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border);
}

.article-body tbody td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.article-body tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--panel) 65%, transparent);
}

.article-body tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
}

@media (max-width: 860px) {
  .article-body table {
    display: table;
    width: 100%;
    max-width: 100%;
  }
}

/* ---------- 代码块(终端墨版) ---------- */
.article-body pre {
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--r-md);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 1.5rem 0;
}

.article-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
  font-family: inherit;
}

/* ---------- Callout ---------- */
.callout {
  position: relative;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.callout::before {
  content: "!";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4em;
  height: 1.4em;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  font-weight: 700;
  font-size: 0.9rem;
  margin-right: 0.6rem;
  vertical-align: middle;
}

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

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

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

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

/* ---------- 数据卡网格 ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.25rem 1.5rem;
  border-top: 3px solid var(--accent);
}

.stat-card:nth-child(2) {
  border-top-color: var(--accent-dark);
}

.stat-card:nth-child(3) {
  border-top-color: var(--warn);
}

.stat-card:nth-child(4) {
  border-top-color: var(--ok);
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-dark);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

/* ---------- 勾叉清单(仅容器装饰,不注入语义标记) ---------- */
.check-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.check-list li {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 0.6rem;
  line-height: 1.7;
}

/* ---------- 结论块 ---------- */
.verdict {
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--panel));
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 1.1rem 1.4rem;
  margin: 1.75rem 0;
  font-weight: 500;
}

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

/* ---------- 文末推广卡 ---------- */
.promo-block {
  background: linear-gradient(135deg, var(--accent-dark), color-mix(in srgb, var(--accent) 80%, var(--accent-dark)));
  border-radius: var(--r-lg);
  padding: 2rem var(--gutter);
  margin: 3rem 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.promo-block .promo-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.4rem;
  color: var(--white);
  letter-spacing: 0.02em;
}

.promo-block .promo-text {
  color: color-mix(in srgb, var(--white) 88%, transparent);
  margin-top: 0.4rem;
  max-width: 40rem;
  line-height: 1.7;
}

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

.promo-block .btn-primary:hover {
  background: color-mix(in srgb, var(--white) 90%, var(--accent));
}

.promo-block .btn-secondary {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--white);
}

.promo-block .btn-secondary:hover {
  background: color-mix(in srgb, var(--white) 14%, transparent);
}

/* ---------- 延伸阅读 ---------- */
#related-posts {
  padding-top: 0;
  padding-bottom: 2rem;
}

.related-heading {
  font-size: 1.3rem;
  margin-top: 1rem;
  margin-bottom: 1.25rem;
  color: var(--ink);
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.related-heading::before {
  content: "";
  display: inline-block;
  width: 1.2em;
  height: 3px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 0.6rem;
}

.related-grid {
  margin-top: 0;
  margin-bottom: 0;
}

/* ---------- 上一篇 / 下一篇 ---------- */
#post-nav {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.post-nav-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0;
}

.post-nav-item {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1rem 1.25rem;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.post-nav-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

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

.post-nav-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.post-nav-title {
  display: block;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .post-card,
  .post-nav-item,
  .tag-btn,
  .promo-block .btn-primary,
  .promo-block .btn-secondary {
    transition: none !important;
  }
}