/* 博客列表页与文章页专属样式 */

/* ===== 列表页 Hero ===== */
.blog-hero {
  padding-top: calc(var(--nav-h) + 3.5rem);
  padding-bottom: 3rem;
  border-bottom: 1px dashed var(--dash);
  background-color: var(--bg);
}

.blog-hero-title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--text);
}

.blog-hero .lead {
  max-width: 44rem;
  margin: 0;
}

/* ===== 标签筛选 ===== */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.25rem;
}

.tag-filter button {
  appearance: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1;
  padding: 0.55rem 0.95rem;
  background-color: transparent;
  color: var(--text-muted);
  border: 1px dashed var(--dash);
  border-radius: 0;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.tag-filter button:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

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

.tag-filter button.is-on {
  background-color: var(--accent);
  color: var(--bg);
  border: 1px solid var(--accent);
  font-weight: 700;
}

/* ===== 文章卡片 ===== */
.post-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.post-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.5rem 1.75rem;
  transition: border-color 0.15s ease;
}

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

.post-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--accent-dark);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.4;
}

.post-card h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
}

.post-card h3 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.post-card p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.post-more {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}

.post-more:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.blog-empty {
  margin: 0;
  padding: 2.5rem 1.5rem;
  border: 1px dashed var(--dash);
  color: var(--text-muted);
  text-align: center;
  font-size: 0.95rem;
}

/* ===== 面包屑(文章页) ===== */
.crumbs {
  padding-top: calc(var(--nav-h) + 1.5rem);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.crumbs a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.crumbs .crumb-sep {
  margin: 0 0.55rem;
  color: var(--dash);
}

.crumbs .crumb-current {
  color: var(--text);
}

/* ===== 文章页 Hero ===== */
.post-hero {
  padding-top: 2rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px dashed var(--dash);
}

.post-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.28;
  color: var(--text);
}

.post-summary {
  margin: 0;
  max-width: 46rem;
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.8;
}

/* ===== 文章正文 ===== */
.post-body {
  padding-top: 2.5rem;
  padding-bottom: 1rem;
}

/* ===== 小节标题(延伸阅读等) ===== */
.blog-sub-title {
  margin: 0 0 1.5rem;
  padding-left: 0.9rem;
  border-left: 5px solid var(--accent);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

/* ===== 文末下载引导卡 ===== */
.post-cta {
  position: relative;
  margin: 3rem 0;
  padding: 2.4rem 2rem 2rem;
  background-color: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0;
  overflow: hidden;
}

.post-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--stripe);
}

.post-cta h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.post-cta p {
  margin: 0 0 1.5rem;
  max-width: 40rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ===== 延伸阅读 ===== */
#related-posts {
  margin: 3rem 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.related-card {
  display: flex;
  flex-direction: column;
}

.related-card h3 {
  font-size: 1.08rem;
}

.related-card p {
  flex: 1 0 auto;
  font-size: 0.9rem;
}

/* ===== 上一篇 / 下一篇 ===== */
#post-nav {
  margin: 0 0 3rem;
}

.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.post-nav-grid--single {
  grid-template-columns: minmax(0, 1fr);
}

.post-nav-link {
  display: block;
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.post-nav-link:hover {
  border-color: var(--accent);
}

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

.post-nav-dir {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.post-nav-title {
  display: block;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
}

/* ===== 右下角常驻下载浮层(仅文章页) ===== */
.dl-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.1rem;
  background-color: var(--accent);
  border: 1px solid var(--accent-dark);
  border-radius: 0;
  color: var(--bg);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.dl-fab:hover {
  background-color: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

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

.dl-fab .ico {
  stroke: currentColor;
}

/* ===== 响应式 ===== */
@media (max-width: 760px) {
  .blog-hero {
    padding-top: calc(var(--nav-h) + 2.5rem);
    padding-bottom: 2.25rem;
  }

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

  .related-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .post-cta {
    padding: 2.2rem 1.25rem 1.5rem;
  }

  .dl-fab {
    right: 1rem;
    bottom: 1rem;
    padding: 0.7rem 0.9rem;
    font-size: 0.85rem;
  }
}