.tagfilter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.tagfilter-btn {
  font-family: var(--ff-body);
  font-size: 0.9rem;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
  padding: 8px 18px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.tagfilter-btn:hover {
  background: var(--paper-tint);
}

.tagfilter-btn.is-on {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  font-weight: 600;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.post-card {
  background: var(--paper);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-soft);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.post-card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.post-date {
  color: var(--ink-soft);
}

.tagchip {
  background: var(--paper-tint2);
  color: var(--brand);
  border-radius: var(--r-tag);
  padding: 3px 10px;
  font-family: var(--ff-body);
  font-size: 0.78rem;
  font-weight: 600;
}

.post-card h3 {
  font-family: var(--ff-display);
  font-size: 1.15rem;
  line-height: 1.5;
  margin: 0;
}

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

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

.post-sum {
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.8;
  margin: 0;
}

/* 面包屑 */
.crumbs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 0;
  margin-top: 1.4rem;
  padding-top: 0.2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.crumbs li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.crumbs a {
  color: var(--ink-soft);
  text-decoration: none;
}

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

.crumb-now {
  color: var(--ink);
  font-weight: 600;
}

/* 文章 Hero */
.post-hero {
  margin-top: 1.6rem;
}

.post-hero-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--ff-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.post-hero h1 {
  font-family: var(--ff-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1.4;
  margin: 0 0 16px;
}

.post-hero-sum {
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 720px;
}

/* 文章正文排版 */
.post-body {
  line-height: 1.8;
  color: var(--ink);
}

.post-body h2 {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  margin: 2.4rem 0 1rem;
  color: var(--ink);
}

.post-body h3 {
  font-family: var(--ff-display);
  font-size: 1.2rem;
  margin: 1.8rem 0 0.8rem;
  color: var(--ink);
}

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

.post-body ul,
.post-body ol {
  margin: 0 0 1.2rem;
  padding-left: 1.4rem;
}

.post-body li {
  margin-bottom: 0.5rem;
}

.post-body pre {
  background: var(--paper-tint);
  border-radius: var(--r-card);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 1.4rem;
}

.post-body code {
  font-family: var(--ff-mono);
  font-size: 0.88rem;
  color: var(--brand-deep);
}

.post-body pre code {
  color: var(--ink);
}

.post-body blockquote {
  border-left: 3px solid var(--brand);
  margin: 0 0 1.4rem;
  padding: 0.4rem 0 0.4rem 1.2rem;
  color: var(--ink-soft);
}

/* 文末下载引导卡 */
.dl-cta {
  background: var(--paper-tint);
  border-radius: var(--r-card);
  padding: 36px;
  margin-top: 3rem;
  text-align: center;
}

.dl-cta h2 {
  font-family: var(--ff-display);
  font-size: 1.4rem;
  margin: 0 0 10px;
}

.dl-cta p {
  color: var(--ink-soft);
  margin: 0 0 22px;
  line-height: 1.8;
}

.dl-cta-acts {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* 延伸阅读 */
.related-wrap {
  margin-top: 3rem;
}

.related-heading {
  font-family: var(--ff-display);
  font-size: 1.3rem;
  margin: 0 0 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 820px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

.related-card {
  display: block;
  background: var(--paper);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-soft);
  padding: 22px;
  text-decoration: none;
  color: var(--ink);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.related-card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}

.related-card h3 {
  font-family: var(--ff-display);
  font-size: 1.02rem;
  line-height: 1.5;
  margin: 10px 0;
}

.related-card .post-sum {
  font-size: 0.88rem;
}

/* 上一篇/下一篇 */
.postnav-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 2.4rem;
}

@media (max-width: 620px) {
  .postnav-wrap {
    grid-template-columns: 1fr;
  }
}

.postnav-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s ease;
}

.postnav-card:hover {
  background: var(--paper-tint);
}

.postnav-next {
  text-align: right;
}

.postnav-dir {
  font-family: var(--ff-mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.postnav-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.5;
}

/* 右下角常驻下载浮层(仅文章页) */
.dl-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--r-pill);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-lift);
  z-index: 40;
  transition: background 0.15s ease;
}

.dl-fab:hover {
  background: var(--brand-deep);
}