/* ==========================================================================
   Clash中国官网 · 博客系统样式
   适用页面:blog/index.html(列表)、blog/articles/*.html(文章)
   全部设计值引用 :root 设计令牌;零圆角、零投影、零渐变、零发光
   ========================================================================== */

/* --------------------------------------------------------------------------
   面包屑(文章页):与页头之间保留呼吸空间,padding-top ≥ 1.2rem
   -------------------------------------------------------------------------- */
.crumbs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3em 0.55em;
  margin: 0;
  padding: 1.75rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.crumbs li {
  display: flex;
  align-items: baseline;
  gap: 0.55em;
  min-width: 0;
}

.crumbs li + li::before {
  content: "/";
  color: var(--ink-soft);
}

.crumbs a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.crumbs a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.crumbs a:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

.crumbs [aria-current="page"] {
  color: var(--text);
  overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   列表页:分类筛选按钮组(共享 1px 墨线)
   -------------------------------------------------------------------------- */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 1.1rem;
  padding: 0;
}

.tag-btn {
  appearance: none;
  margin: 0 -1px -1px 0;
  padding: 0.72em 1.15em;
  border: 1px solid var(--ink);
  background: var(--paper-panel);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.tag-btn:hover {
  background: var(--paper-panel-2);
}

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

.tag-btn.is-active {
  position: relative;
  border-color: var(--cinnabar);
  background: var(--cinnabar);
  color: var(--paper);
}

/* 列表注记与空态 */
.list-note {
  margin: 0 0 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-empty {
  margin: 0 0 2.5rem;
  padding: 1.6rem 1.4rem;
  border: 1px dashed var(--ink-soft);
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   文章卡片格线表(列表页与延伸阅读共用)
   容器出上/左墨线,卡片自带完整边框并以 -1px 外边距并线
   -------------------------------------------------------------------------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: 0;
  margin: 0 0 2.5rem;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.post-grid:empty {
  border: 0;
  margin-bottom: 0;
}

.post-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin: -1px 0 0 -1px;
  padding: 1.5rem 1.4rem 1.35rem;
  border: 1px solid var(--ink);
  background: var(--paper);
  transition: background-color 0.15s ease;
}

.post-card:hover {
  background: var(--paper-panel);
}

.post-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6em 0.9em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
}

.post-tag {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0.22em 0.55em;
  border: 1px solid var(--ochre);
  color: var(--ochre);
}

.post-meta time {
  color: var(--text-muted);
  white-space: nowrap;
}

.post-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.26rem;
  font-weight: 700;
  line-height: 1.5;
}

.post-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.post-card h3 a:hover {
  color: var(--cinnabar);
}

.post-card h3 a:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

.post-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.85;
}

.post-more {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 0.15em;
  border-bottom: 1px solid var(--cinnabar);
  color: var(--cinnabar);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
}

.post-more:hover {
  color: var(--cinnabar-dark);
  border-bottom-color: var(--cinnabar-dark);
}

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

/* --------------------------------------------------------------------------
   文章页 Hero:日期 + 分类标签 + 阅读时长 → H1 → 摘要
   -------------------------------------------------------------------------- */
.post-hero {
  margin: 0 0 2.25rem;
  padding: 1.4rem 0 2rem;
  border-bottom: 1px solid var(--ink);
}

.post-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5em 1.1em;
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.2vw, 2.5rem);
  font-weight: 700;
  line-height: 1.4;
}

.post-hero-summary {
  margin: 0;
  max-width: 46em;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.9;
}

/* --------------------------------------------------------------------------
   文章正文排版
   -------------------------------------------------------------------------- */
.post-body {
  max-width: 46em;
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.95;
}

.post-body > *:first-child {
  margin-top: 0;
}

.post-body h2 {
  display: flex;
  align-items: center;
  gap: 0.55em;
  margin: 2.4em 0 0.9em;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.5;
  scroll-margin-top: calc(var(--head-h) + 16px);
}

.post-body h2::before {
  content: "";
  flex: none;
  width: 0.5em;
  height: 0.5em;
  background: var(--cinnabar);
}

.post-body h3 {
  margin: 2em 0 0.7em;
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 700;
  line-height: 1.55;
  scroll-margin-top: calc(var(--head-h) + 16px);
}

.post-body p {
  margin: 0 0 1.2em;
}

.post-body ul,
.post-body ol {
  margin: 0 0 1.3em;
  padding-left: 1.6em;
}

.post-body li {
  margin-bottom: 0.45em;
}

.post-body li::marker {
  color: var(--cinnabar);
}

.post-body a {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar);
}

.post-body a:hover {
  color: var(--cinnabar-dark);
  border-bottom-color: var(--cinnabar-dark);
}

.post-body a:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

.post-body code {
  padding: 0.15em 0.4em;
  background: var(--paper-panel-2);
  font-family: var(--font-mono);
  font-size: 0.86em;
  overflow-wrap: anywhere;
}

.post-body pre {
  margin: 0 0 1.4em;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--ink);
  background: var(--paper-panel);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.75;
  tab-size: 2;
}

.post-body pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

.post-body blockquote {
  margin: 0 0 1.4em;
  padding: 0.9rem 1.2rem;
  border-left: 3px solid var(--ochre);
  background: var(--paper-panel);
  color: var(--text-muted);
}

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

.post-body hr {
  margin: 2.2em 0;
  border: 0;
  border-top: 1px solid var(--ink-faint);
}

.post-body img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

.post-body .table-wrap,
.post-body .callout {
  margin: 0 0 1.5em;
}

/* --------------------------------------------------------------------------
   文末下载引导卡
   -------------------------------------------------------------------------- */
.post-cta {
  margin: 3rem 0 0;
  padding: 1.8rem 1.6rem;
  border: 1px solid var(--ink);
  background: var(--paper-panel);
}

.post-cta h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.5;
}

.post-cta p {
  margin: 0 0 1.2rem;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.85;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* --------------------------------------------------------------------------
   延伸阅读(related.js 渲染挂载点)
   -------------------------------------------------------------------------- */
#related-posts {
  margin-top: 3rem;
}

#related-posts:empty {
  display: none;
  margin: 0;
}

#related-posts .sec-head {
  margin-bottom: 1.4rem;
}

#related-posts .post-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   上一篇 / 下一篇(related.js 渲染挂载点)
   -------------------------------------------------------------------------- */
#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 2rem 0 3rem;
}

#post-nav:empty {
  display: none;
  margin: 0;
}

.post-nav-item {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--ink);
  background: var(--paper);
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.post-nav-item + .post-nav-item {
  margin-left: -1px;
}

.post-nav-item:hover {
  background: var(--paper-panel);
}

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

.post-nav-dir {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ochre);
}

.post-nav-prev .post-nav-dir::before {
  content: "← ";
}

.post-nav-next .post-nav-dir::after {
  content: " →";
}

.post-nav-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

.post-nav-item:hover .post-nav-title {
  color: var(--cinnabar);
}

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

.post-nav-next:first-child {
  grid-column: 2;
}

/* --------------------------------------------------------------------------
   窄屏
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  #related-posts .post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .crumbs {
    padding-top: 1.4rem;
  }

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

  .post-card {
    padding: 1.3rem 1.1rem 1.2rem;
  }

  .post-hero {
    padding-top: 1.2rem;
  }

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

  .post-nav-item + .post-nav-item {
    margin-left: 0;
    margin-top: -1px;
  }

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

  .post-nav-next:first-child {
    grid-column: auto;
  }
}