.dashed-divider {
  border: 0;
  border-top: 1px dashed var(--border-color);
  background: transparent;
  height: 0;
  width: 100%;
  margin: 1.5rem 0;
}

.rss-cta {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 2rem auto 1rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: transparent;
  text-align: center;
}
.rss-cta-heading {
  font-family: var(--font-primary);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-color-primary);
  margin: 0 0 0.4rem;
}
.rss-cta-body {
  font-size: var(--font-size-secondary);
  color: var(--text-color-secondary);
  line-height: 1.55;
  margin: 0 0 1rem;
  max-width: 36ch;
}
.rss-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-color-secondary);
  color: var(--link-color);
  font-size: var(--font-size-secondary);
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s ease;
}
.rss-cta-button:hover {
  background: var(--bg-color-primary);
  text-decoration: none;
}
.rss-cta-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
@media (max-width: 480px) {
  .rss-cta {
    padding: 1rem;
  }
  .rss-cta-body { font-size: 0.85rem; }
}

.giscus {
  margin: 1.5rem 0 0;
}
.giscus-heading {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-color-primary);
  margin: 0 0 1rem;
}

.giscus-config-note {
  margin: 1.5rem 0 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--border-color);
  background: var(--bg-color-secondary);
  color: var(--text-color-secondary);
  font-size: var(--font-size-secondary);
}
.giscus-config-note p { margin: 0.25rem 0; }
.giscus-config-note code {
  font-size: 0.85em;
  background: var(--bg-color-primary);
  border: 1px solid var(--border-color);
  padding: 0 4px;
  border-radius: 3px;
}

header .brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: nowrap;
}
header .brand-row .title {
  flex: 1 1 auto;
  min-width: 0;
}
header .brand-row .title h1 {
  margin: 0;

  color: var(--text-color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}
header .tagline {
  margin: 0.2rem 0 0;
  color: var(--text-color-secondary);
  font-size: var(--font-size-secondary);
  font-weight: 400;
}
header .site-avatar {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  object-fit: cover;
  align-self: center;
}
@media (max-width: 420px) {
  header .site-avatar { width: 36px; height: 36px; }
}

@media (max-width: 600px) {
  header .brand-row .title h1 {
    font-size: clamp(1.45rem, 6vw, 1.8rem);
    line-height: 1.1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

nav .nav-links {
  display: flex;
  flex: 1 1 auto;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}
nav .nav-links > a {
  margin-right: 0;
}
nav .nav-links .nav-sep {
  color: var(--text-color-tertiary);
  user-select: none;
  pointer-events: none;
  font-family: var(--font-secondary);
  display: inline-flex;
  align-items: center;
  height: 1em;
}
nav .nav-links a[aria-current="page"] {
  color: var(--text-color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}
nav .nav-links a[aria-current="page"]:hover {
  text-decoration: underline;
}

ul.recent-posts {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}
.recent-posts-heading {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-color-primary);
  margin: 0 0 0.75rem;
}

.recent-posts-more {
  margin: -0.5rem 0 1.5rem;
  font-size: var(--font-size-secondary);
  color: var(--text-color-secondary);
}
.recent-posts-more a {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.recent-posts-more a:hover {
  text-decoration: none;
}
.recent-posts-more .recent-posts-count {
  color: var(--text-color-tertiary);
  font-family: var(--font-secondary);
  margin-left: 0.4rem;
}

.post-meta {
  margin: 0 0 1.5rem;
  color: var(--text-color-tertiary);
  font-family: var(--font-secondary);
  font-size: 0.8rem;
  line-height: 1.6;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
  align-items: center;
}
.post-meta time { font-style: normal; }
.post-meta .meta-sep { opacity: 0.6; }
.post-meta .meta-tag {
  color: var(--text-color-secondary);
  text-decoration: none;
}
.post-meta .meta-tag:hover { color: var(--link-color); }

.katex-display-block {
  margin: 1.25rem auto;
  text-align: center;
  font-size: 1.05em;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}
.katex-inline { /* inline math — no extra spacing needed */ }

.mermaid {
  margin: 1.5rem auto;
  text-align: center;
  display: block;
  background: transparent;
}
.mermaid svg {
  max-width: 100%;
  height: auto;
}

mark {
  background: var(--bg-color-secondary);
  color: var(--text-color-primary);
  padding: 0.05em 0.3em;
  border-radius: 3px;
  border: 1px solid var(--border-color);
  font-weight: 600;
}

.filter-meta {
  margin: -0.5rem 0 1rem;
  font-size: var(--font-size-secondary);
  color: var(--text-color-secondary);
}
.filter-meta .filter-tag {
  font-family: var(--font-secondary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.filter-meta .filter-clear {
  color: var(--text-color-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.filter-meta .filter-clear:hover {
  color: var(--link-color);
  text-decoration: none;
}

#search-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.55rem 0.8rem;
  margin: 0.5rem 0 0.25rem;
  font-family: var(--font-secondary);
  font-size: 0.9rem;
  color: var(--text-color);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  outline: none;
  transition: border-color 0.15s ease;
}
#search-input:focus {
  border-color: var(--link-color);
}

.post-count {
  margin: 0.75rem 0 0.5rem;
  font-size: var(--font-size-secondary);
  color: var(--text-color-tertiary);
  font-family: var(--font-secondary);
}

.post-list { list-style: none; padding: 0; margin: 0; }

.post-year-header { list-style: none; padding: 0; margin: 0; }
.post-year-heading {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-color-primary);
  letter-spacing: -0.01em;
}
.post-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-top: 1px dashed var(--border-color);
  align-items: baseline;
}
.post-row:first-of-type { border-top: 0; padding-top: 0.25rem; }
.post-row:last-child { border-bottom: 0; }
.post-row-date {
  font-family: var(--font-secondary);
  font-size: 0.85rem;
  color: var(--text-color-tertiary);
  padding-top: 0.15rem;
  white-space: nowrap;
}
.post-row-title {
  text-decoration: none;
  font-weight: 600;
}
.post-row-title:hover { text-decoration: underline; }
.post-row-excerpt {
  display: block;
  color: var(--text-color-secondary);
  font-size: var(--font-size-secondary);
  margin-top: 0.15rem;
  line-height: 1.5;
}
@media (max-width: 540px) {
  .post-row { grid-template-columns: 1fr; gap: 0.15rem; }
  .post-row-date { padding-top: 0; }
  .post-row:first-of-type { padding-top: 0; }
}

.tags-index {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.tags-index li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-top: 1px dashed var(--border-color);
}
.tags-index li:last-child { border-bottom: 1px dashed var(--border-color); }
.tags-index-link {
  flex: 1 1 auto;
  font-family: var(--font-secondary);
  text-decoration: none;
  color: var(--link-color);
}
.tags-index-link:hover { text-decoration: underline; }
.tags-index-count {
  flex: 0 0 auto;
  font-family: var(--font-secondary);
  font-size: 0.8rem;
  color: var(--text-color-tertiary);
  background: var(--bg-color-secondary);
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  min-width: 1.5rem;
  text-align: center;
}

.tags-cloud-label {
  margin: 1.5rem 0 0.5rem;
  font-size: var(--font-size-secondary);
  color: var(--text-color-tertiary);
  font-family: var(--font-secondary);
}
.tags-cloud {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
}
.tags-cloud li {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
}
.tags-cloud a {
  text-decoration: none;
}
.tags-cloud a:hover { text-decoration: underline; }
.tags-cloud-count {
  font-family: var(--font-secondary);
  font-size: 0.75rem;
  color: var(--text-color-tertiary);
}