:root {
  color-scheme: light;
  --color-background: #ffffff;
  --color-surface: #f5f5f5;
  --color-text: #111111;
  --color-muted: #555555;
  --color-border: #d9d9d9;
  --max-width: 72ch;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Hiragino Sans GB", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 1.25rem;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.8;
  background-color: var(--color-background);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: border-color 0.2s ease;
}

a:hover,
a:focus {
  border-color: var(--color-text);
}

img,
video {
  max-width: 100%;
  height: auto;
}

.site-head,
.site-foot {
  max-width: var(--max-width);
  margin: 2rem auto;
}

.site-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-title a {
  border: none;
}

.site-subtitle {
  margin: 0.5rem 0 0;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0;
  margin: 1.5rem 0 0;
  list-style: none;
  font-family: var(--font-sans);
}

.category-nav {
  margin: 0 0 2.5rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.category-nav ul {
  display: flex;
  flex-wrap: wrap;
  column-gap: 0;
  row-gap: 0.35rem;
  padding: 0;
  margin: 0;
  list-style: none;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 600;
}

.category-nav li {
  display: flex;
  align-items: center;
}

.category-nav li + li::before {
  content: "/";
  margin: 0 0.75rem;
  color: var(--color-muted);
  font-weight: 400;
}

.category-nav a {
  border: none;
  display: inline-flex;
  align-items: center;
}

.category-name {
  letter-spacing: 0.02em;
}

.category-count {
  margin-left: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-muted);
  font-weight: 400;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto 4rem;
}

.post-list {
  display: grid;
  gap: 2.5rem;
}

.post-card header h2 {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.4;
}

.post-card .post-meta {
  margin: 0.75rem 0 0;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.post-summary {
  margin: 1rem 0 0;
  color: var(--color-text);
}

.post-single h1,
.page-single h1 {
  font-size: 2rem;
  margin: 0;
  font-family: var(--font-sans);
  letter-spacing: 0.02em;
}

.post-single .post-meta,
.page-single .post-meta {
  margin: 1rem 0 2rem;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.post-content p,
.post-content ul,
.post-content ol,
.post-content blockquote,
.post-content pre {
  margin: 1.5rem 0;
}

.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: var(--font-sans);
  margin: 2.5rem 0 1rem;
  color: var(--color-text);
}

.post-content blockquote {
  padding: 0.75rem 1.5rem;
  background-color: var(--color-surface);
  border-left: 3px solid var(--color-border);
  color: var(--color-muted);
}

.post-content code {
  font-family: "Fira Code", "JetBrains Mono", "Cascadia Code", "Source Code Pro", monospace;
  font-size: 0.95em;
  padding: 0.1em 0.3em;
  background: var(--color-surface);
  border-radius: 3px;
}

.post-content pre {
  padding: 1rem;
  overflow-x: auto;
  background: var(--color-surface);
  border-radius: 4px;
  font-size: 0.95em;
}

.post-content p:has(img) {
    text-align: center;
}

.post-tags {
  margin-top: 3rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.post-tags ul {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-tags a {
  border: 1px solid var(--color-border);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.post-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 4rem 0 0;
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
}

.post-nav-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-family: var(--font-sans);
}

.post-nav-item span {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.post-nav-item strong {
  font-size: 1.1rem;
}

.pagination {
  margin: 3rem 0 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-sans);
}

.pagination .page-link {
  border: none;
  font-size: 0.95rem;
}

.pagination .page-info {
  color: var(--color-muted);
}

.site-foot {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  display: grid;
  grid-template-columns: minmax(0, 220px) minmax(0, 1fr) minmax(0, 220px);
  align-items: center;
  gap: 1.5rem;
}

.site-foot-meta {
  margin: 0;
}

.site-foot-links {
  justify-self: center;
}

.site-foot-social {
  justify-self: end;
}

.site-foot-links ul,
.site-foot-social ul {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  gap: 0.75rem;
}

.site-foot-links ul {
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-foot-links ul::-webkit-scrollbar {
  display: none;
}

.site-foot-links li {
  display: flex;
  align-items: center;
}

.site-foot-links li + li::before {
  content: "/";
  margin: 0 0.5rem;
  color: var(--color-border);
}

.site-foot-links a {
  border: none;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.site-foot-social ul {
  gap: 0.85rem;
  justify-content: flex-end;
  flex-wrap: nowrap;
}

.social-link {
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-radius: 50%;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.social-icon {
  font-size: 1.05rem;
}

.social-icon svg {
  width: 1.1rem;
  height: 1.1rem;
  display: block;
}

@media (max-width: 640px) {
  .site-foot {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1rem;
  }

  .site-foot-links {
    justify-self: stretch;
  }

  .site-foot-social {
    justify-self: center;
  }

  .site-foot-links ul,
  .site-foot-social ul {
    flex-wrap: wrap;
    justify-content: center;
  }

}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 768px) {
  body {
    padding: 0 2rem;
    font-size: 19px;
  }

  .post-card header h2 {
    font-size: 1.6rem;
  }

  .post-single h1,
  .page-single h1 {
    font-size: 2.4rem;
  }

  .post-nav {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
}