/* ==========================================================================
   博客系统专属样式(列表页 + 文章页)
   设计令牌全部引用 :root;直角零圆角;暖金仅用于悬停态与激活指示条
   ========================================================================== */

/* ---------- 列表页:标签筛选 ---------- */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 2.75rem;
}

.tag-btn {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 0.6em 1.15em;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.tag-btn:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.tag-btn.is-on {
  color: var(--text);
  border-color: var(--border-strong);
  box-shadow: inset 2px 0 0 var(--accent);
}

/* ---------- 列表页:文章卡 ---------- */
.post-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  min-width: 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.75rem 1.75rem 1.5rem;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.post-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-panel2);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.post-tag {
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.2em 0.65em;
}

.post-date {
  color: var(--text-dim);
}

.post-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
}

.post-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.post-title a:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

.post-summary {
  flex: 1;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.post-card .link-arrow {
  align-self: flex-start;
  margin-top: 0.35rem;
}

.post-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 3rem 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-align: center;
}

/* ---------- 文章页:页头与面包屑 ---------- */
.post-head {
  padding-top: calc(var(--nav-h) + 2rem);
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.post-head .crumbs {
  margin-top: 1.5rem;
  margin-bottom: 2.5rem;
}

.post-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.25rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.post-hero-tag {
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.2em 0.65em;
}

.post-hero-title {
  margin: 0 0 1.25rem;
  max-width: 22em;
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 1.2rem + 2.6vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.post-hero-lead {
  margin: 0;
  max-width: 44em;
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.85;
}

/* ---------- 文章页:正文 ---------- */
.post-body {
  padding-top: 3.25rem;
  padding-bottom: 2.5rem;
}

.post-body .prose {
  max-width: 46rem;
}

/* ---------- 文末下载引导卡 ---------- */
.dl-guide {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 2.5rem;
  margin: 3.5rem 0;
  padding: 2rem 2.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: 0;
}

.dl-guide-main {
  flex: 1 1 20rem;
  min-width: 0;
}

.dl-guide-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
}

.dl-guide-desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.dl-guide-actions {
  display: flex;
  flex-wrap: wrap;
  flex: none;
  gap: 0.75rem;
}

/* ---------- 延伸阅读 ---------- */
.related-posts {
  margin-top: 3.5rem;
  padding-top: 3rem;
  padding-bottom: 1.5rem;
  border-top: 1px solid var(--border);
}

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

.related-grid .post-card {
  padding: 1.5rem 1.5rem 1.25rem;
}

.related-grid .post-title {
  font-size: 1.0625rem;
}

/* ---------- 上一篇 / 下一篇 ---------- */
.post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  max-width: var(--wrap-max);
  margin: 1.5rem auto 0;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  padding-bottom: 3.5rem;
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  min-width: 0;
  padding: 1.35rem 1.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

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

.post-nav-link:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.post-nav-dir {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.post-nav-name {
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.6;
  overflow-wrap: anywhere;
  transition: color 0.2s ease;
}

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

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

/* ---------- 文章页常驻下载浮层(仅文章页使用) ---------- */
.dl-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1.2rem;
  background: var(--accent);
  color: var(--on-accent);
  border: 1px solid var(--accent);
  border-radius: 0;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.dl-fab:hover {
  background: var(--accent-bright);
  border-color: var(--accent-bright);
}

.dl-fab:focus-visible {
  outline: 1px solid var(--text);
  outline-offset: 2px;
}

.dl-fab svg {
  width: 1em;
  height: 1em;
  flex: none;
}

/* ---------- 无脚本兜底列表 ---------- */
.post-list-static {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.post-list-static a {
  display: block;
  padding-bottom: 0.85rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: color 0.2s ease;
}

.post-list-static a:hover {
  color: var(--accent);
}

/* ---------- 断点 ---------- */
@media (max-width: 960px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

/* 窄屏防溢出:文章页任何宽内容(表格/终端/引导卡)不得撑破视口 */
@media (max-width: 640px) {
  .post-body .prose,
  .post-body .prose > * {
    max-width: 100%;
    min-width: 0;
  }
  .dl-guide {
    padding: 1.5rem 1.25rem;
  }
  .dl-guide-main {
    flex-basis: 100%;
    min-width: 0;
  }
}

@media (max-width: 860px) {
  .post-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .post-nav {
    grid-template-columns: 1fr;
  }

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

  .dl-guide {
    padding: 1.75rem 1.5rem;
  }
}

@media (max-width: 640px) {
  .post-card {
    padding: 1.5rem 1.25rem 1.25rem;
  }

  .dl-fab {
    right: 1rem;
    bottom: 1rem;
    padding: 0.7rem 1rem;
  }
}