/* ============================================
   VPNDK 博客样式
   ============================================ */

/* ---------- 博客列表页 ---------- */

.blog-hero {
  padding: 3rem 0 2rem;
  max-width: 57rem;
  margin-inline: auto;
  text-align: center;
}

.blog-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin-bottom: 0.75rem;
}

.blog-hero .kw {
  color: var(--c-acc);
}

.blog-hero-sub {
  font-size: 1.05rem;
  color: var(--c-dim);
  max-width: 36rem;
  margin-inline: auto;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  padding: 1rem 0 2rem;
  max-width: 57rem;
  margin-inline: auto;
}

.filter-btn {
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  color: var(--c-dim);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.filter-btn:hover {
  border-color: var(--c-acc);
  color: var(--c-ink);
}

.filter-btn.is-active {
  background: var(--c-acc);
  border-color: var(--c-acc);
  color: var(--c-bg);
  font-weight: 700;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding-bottom: 4rem;
  max-width: 57rem;
  margin-inline: auto;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  border-color: var(--c-acc);
  transform: translateY(-2px);
  box-shadow: var(--shade-chip);
}

.post-tag {
  align-self: flex-start;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--tint-acc);
  color: var(--c-acc);
  font-size: 0.75rem;
  font-weight: 600;
}

.post-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
  text-wrap: pretty;
}

.post-summary {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-dim);
  flex-grow: 1;
}

.post-meta {
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  color: var(--c-dim);
}

.post-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--c-dim);
  padding: 3rem 0;
}

/* ---------- 文章页 ---------- */

.breadcrumb {
  max-width: 57rem;
  margin: 1.5rem auto 0;
  padding: 0 1.5rem;
  font-size: 0.85rem;
  color: var(--c-dim);
}

.breadcrumb a {
  color: var(--c-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: var(--c-acc);
}

.article-page {
  padding-bottom: 2rem;
}

.article-hero {
  position: relative;
  max-width: 57rem;
  margin: 1.5rem auto 0;
  padding: 2.5rem 1.5rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-l);
  overflow: hidden;
}

.article-hero::before {
  content: "";
  position: absolute;
  top: 15%;
  right: 0;
  width: 42%;
  height: 70%;
  background: var(--tint-acc);
  border-radius: var(--rad-m);
  z-index: 0;
}

.article-wrap {
  position: relative;
  z-index: 1;
  max-width: 54rem;
  margin-inline: auto;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
  padding-left: 0.75rem;
}

.article-meta .meta-tag {
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--c-acc);
  color: var(--c-bg);
  font-size: 0.75rem;
  font-weight: 600;
}

.article-meta .meta-date,
.article-meta .meta-read {
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  color: var(--c-dim);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}

.article-hero h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin-bottom: 1rem;
}

.article-summary {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--c-dim);
  max-width: 48rem;
  padding-left: 0.75rem;
}

/* 正文 */

.reading-wrap {
  max-width: 57rem;
  width: 100%;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-ink);
  counter-reset: h2counter;
  padding-top: 1rem;
}

.article-body p {
  margin: 1.2rem 0;
}

.article-body h2 {
  counter-increment: h2counter;
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin: 2.5rem 0 1rem;
  padding-top: 1rem;
  padding-left: 2.5rem;
  border-top: 1px solid var(--c-line);
  position: relative;
}

.article-body h2::before {
  content: counter(h2counter, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.2rem;
  font-family: var(--ff-mono);
  font-size: 0.85rem;
  color: var(--c-acc);
  font-weight: 600;
}

.article-body h3 {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin: 2rem 0 0.75rem;
}

.article-body ul,
.article-body ol {
  margin: 1.2rem 0;
  padding-left: 1.5rem;
}

.article-body li {
  margin: 0.5rem 0;
}

.article-body a {
  color: var(--c-acc);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 1.2rem 1.5rem;
  border-left: 3px solid var(--c-acc);
  background: var(--c-panel);
  border-radius: 0 var(--rad-m) var(--rad-m) 0;
  color: var(--c-dim);
  font-style: italic;
}

.article-body code {
  font-family: var(--ff-mono);
  font-size: 0.9em;
  background: var(--c-panel2);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.article-body pre {
  background: color-mix(in srgb, var(--c-bg) 82%, #000);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  padding: 1.5rem;
  overflow-x: auto;
  position: relative;
  margin: 2rem 0;
}

.article-body pre::before {
  content: "terminal";
  position: absolute;
  top: 0.6rem;
  left: 1rem;
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  color: var(--c-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--c-ink);
}

/* 表格 */

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9rem;
}

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

.article-body td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--c-line);
  color: var(--c-ink);
}

.article-body tbody tr:nth-child(even) {
  background: var(--c-panel);
}

.article-body tbody tr:hover {
  background: var(--tint-acc);
}

.table-scroll {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 860px) {
  .article-body table {
    display: block;
    width: max-content;
    max-width: none;
    overflow-x: auto;
  }
}

/* callout */

.callout {
  position: relative;
  padding: 1.5rem 1.5rem 1.5rem 3.2rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-acc);
  border-radius: var(--rad-m);
  margin: 2rem 0;
}

.callout::before {
  content: "!";
  position: absolute;
  left: 1rem;
  top: 1.2rem;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--tint-acc);
  color: var(--c-acc);
  text-align: center;
  line-height: 1.5rem;
  font-weight: 700;
  font-size: 0.85rem;
}

.callout.warning {
  border-left-color: var(--c-warn);
}

.callout.warning::before {
  content: "!";
  background: color-mix(in srgb, var(--c-warn) 15%, transparent);
  color: var(--c-warn);
}

.callout.success {
  border-left-color: var(--c-ok);
}

.callout.success::before {
  content: "✓";
  background: color-mix(in srgb, var(--c-ok) 15%, transparent);
  color: var(--c-ok);
}

/* stat-grid */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.stat-card {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-acc);
}

.stat-card:nth-child(even) {
  background: var(--c-panel2);
}

.stat-card:nth-child(even)::before {
  background: var(--c-acc2);
}

.stat-num {
  font-family: var(--ff-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--c-acc);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--c-dim);
  line-height: 1.5;
}

/* check-list */

.check-list {
  list-style: none;
  padding: 1.5rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  margin: 2rem 0;
}

.check-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--c-line);
  color: var(--c-ink);
}

.check-list li:last-child {
  border-bottom: none;
}

/* verdict */

.verdict {
  border-left: 3px solid var(--c-acc);
  background: var(--tint-acc);
  border-radius: 0 var(--rad-m) var(--rad-m) 0;
  padding: 1.2rem 1.5rem;
  margin: 2rem 0;
}

.verdict strong {
  color: var(--c-acc);
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.verdict p {
  margin: 0;
  color: var(--c-ink);
}

/* 文末推广 */

.promo-block {
  max-width: 57rem;
  margin: 3rem auto 2rem;
  padding: 2.5rem 1.5rem;
  background: linear-gradient(135deg, var(--c-panel2), var(--c-panel));
  border: 1px solid var(--c-acc);
  border-radius: var(--rad-l);
  text-align: center;
}

.promo-block h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--c-ink);
  text-wrap: pretty;
  margin-bottom: 0.5rem;
}

.promo-block p {
  color: var(--c-dim);
  margin-bottom: 1.5rem;
  max-width: 36rem;
  margin-inline: auto;
}

.promo-block .cta-main {
  background: var(--c-ink);
  color: var(--c-bg);
  box-shadow: none;
}

.promo-block .cta-main:hover {
  background: var(--c-acc);
  color: var(--c-bg);
}

.promo-block .cta-plain {
  border-color: var(--c-ink);
  color: var(--c-ink);
  margin-left: 0.5rem;
}

.promo-block .cta-plain:hover {
  border-color: var(--c-acc);
  color: var(--c-acc);
}

/* 延伸阅读 */

#related-posts {
  max-width: 57rem;
  margin: 0 auto;
  padding-top: 2rem;
}

.related-heading {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-inline: 1.5rem;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.2rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

.related-card:hover {
  border-color: var(--c-acc);
  transform: translateY(-2px);
}

.related-tag {
  align-self: flex-start;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--tint-acc);
  color: var(--c-acc);
  font-size: 0.7rem;
  font-weight: 600;
}

.related-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
  text-wrap: pretty;
}

.related-meta {
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  color: var(--c-dim);
}

/* 上一篇/下一篇 */

#post-nav {
  max-width: 57rem;
  margin: 0 auto;
  padding-bottom: 2rem;
  padding-inline: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

#post-nav.single {
  grid-template-columns: 1fr;
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.2rem 1.5rem;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--rad-m);
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}

.post-nav-link:hover {
  border-color: var(--c-acc);
  background: var(--c-panel2);
}

.post-nav-link span {
  font-size: 0.75rem;
  color: var(--c-dim);
  font-family: var(--ff-mono);
}

.post-nav-link strong {
  font-size: 0.95rem;
  color: var(--c-ink);
  line-height: 1.4;
  font-weight: 700;
  text-wrap: pretty;
}

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

.post-nav-link.next span {
  align-self: flex-end;
}

/* 标题防断词覆盖 */

.article-hero h1,
.article-body h2,
.article-body h3,
.blog-hero h1,
.post-title,
.related-title,
.post-nav-link strong,
.promo-block h2,
.related-heading {
  text-wrap: pretty;
}

/* 响应式 */

@media (max-width: 720px) {
  .article-hero h1 .no-break {
    white-space: normal;
  }

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

  #post-nav {
    grid-template-columns: 1fr;
  }

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

  .post-nav-link.next span {
    align-self: flex-start;
  }

  .blog-hero {
    padding: 2rem 0 1.5rem;
    text-align: left;
  }

  .blog-hero-sub {
    margin-inline: 0;
  }

  .blog-filters {
    justify-content: flex-start;
  }
}

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