/* ===== 面包屑 ===== */
.crumbs {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1.6rem;
  padding-top: .25rem;
  padding-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--c-muted);
}

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

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

.crumbs .sep {
  color: var(--c-border);
}

.crumbs .cur {
  color: var(--c-text);
}

/* ===== 博客列表 Hero ===== */
.blog-hero {
  padding-top: 1.5rem;
}

/* ===== 标签筛选 ===== */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-bottom: 1.8rem;
}

.tag-btn {
  appearance: none;
  border: 1px solid var(--c-border);
  background: var(--c-panel);
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .02em;
  padding: .5rem 1rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease, background-color .15s ease;
}

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

.tag-btn.is-active {
  background: var(--c-accent);
  color: #1a1305;
  border-color: var(--c-accent);
  font-weight: 600;
}

/* ===== 文章卡片网格 ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  background: var(--c-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-panel);
  padding: 1.3rem 1.4rem 1.5rem;
  text-decoration: none;
  color: var(--c-text);
  position: relative;
  transition: border-color .15s ease, transform .15s ease;
}

.post-card::after {
  content: "";
  position: absolute;
  left: 1.4rem;
  right: 1.4rem;
  top: 3.1rem;
  height: 1px;
  background: var(--ink-30, rgba(0, 0, 0, .3));
}

.post-card:hover {
  border-color: var(--c-accent-dark);
  transform: translateY(-2px);
}

.post-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--c-muted);
}

.post-tag {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  padding: .2rem .6rem;
  color: var(--c-accent);
  white-space: nowrap;
}

.post-title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.4;
  margin: .2rem 0 0;
}

.post-sum {
  color: var(--c-muted);
  font-size: .92rem;
  line-height: 1.6;
  flex: 1;
}

.post-more {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--c-accent);
}

@media (max-width: 980px) {
  .post-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .post-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 文章 Hero ===== */
.article-hero {
  padding-top: 1.2rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: .8rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--c-muted);
  margin-bottom: .8rem;
}

.article-meta .post-tag {
  color: var(--c-accent);
}

.article-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.3;
  margin: 0 0 .8rem;
}

.article-lede {
  color: var(--c-muted);
  font-size: 1.02rem;
  line-height: 1.7;
  max-width: 46rem;
}

/* ===== 文末下载引导卡 ===== */
.dl-cta {
  background: var(--c-panel2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-panel);
  padding: 1.8rem 2rem;
  box-shadow: var(--shadow-board);
  position: relative;
}

.dl-cta::before {
  content: "";
  position: absolute;
  left: 2rem;
  right: 2rem;
  top: 3.6rem;
  height: 1px;
  background: var(--ink-30, rgba(0, 0, 0, .3));
}

.dl-cta h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin: 0 0 .6rem;
}

.dl-cta p {
  color: var(--c-muted);
  margin: 0 0 1.2rem;
  line-height: 1.6;
}

.dl-cta-acts {
  display: flex;
  gap: .8rem;
  flex-wrap: wrap;
}

/* ===== 延伸阅读 ===== */
#related-posts {
  padding-top: 2.4rem;
  padding-bottom: 1rem;
}

.related-grid {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 980px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 上一篇 / 下一篇 ===== */
#post-nav {
  padding-top: 1rem;
  padding-bottom: 2.4rem;
}

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

.post-nav-item {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  background: var(--c-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-tile);
  padding: 1rem 1.2rem;
  text-decoration: none;
  color: var(--c-text);
  transition: border-color .15s ease;
}

.post-nav-item:hover {
  border-color: var(--c-accent-dark);
}

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

.post-nav-dir {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--c-accent);
}

.post-nav-title {
  font-size: .92rem;
  line-height: 1.5;
  color: var(--c-text);
}

.post-nav-empty {
  visibility: hidden;
}

@media (max-width: 640px) {
  .post-nav-inner {
    grid-template-columns: 1fr;
  }

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