:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --fg: #1f2328;
  --fg-soft: #656d76;
  --border: #e4e7eb;
  --link: #0b62d0;
  --code-bg: #f2f4f7;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --bg-soft: #1d2025;
    --fg: #d6dae0;
    --fg-soft: #8b949e;
    --border: #2b2f36;
    --link: #6cb2ff;
    --code-bg: #1d2025;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  text-rendering: optimizeLegibility;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; border-radius: var(--radius); }
hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

.container { max-width: 760px; margin: 0 auto; padding: 0 22px; }

/* ---------- 页头 ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(180%) blur(8px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
  flex-wrap: wrap;
}
.logo { font-size: 1.15rem; font-weight: 700; color: var(--fg); letter-spacing: .3px; }
.logo:hover { text-decoration: none; color: var(--link); }
.nav { display: flex; gap: 18px; font-size: .93rem; }
.nav a { color: var(--fg-soft); padding: 2px 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--link); text-decoration: none; }
.nav a.active { color: var(--fg); border-bottom-color: var(--link); }

/* ---------- 首页头部 ---------- */
main { padding: 34px 0 60px; }
.intro { margin: 4px 0 34px; }
.intro-title { font-size: 1.85rem; margin: 0 0 8px; letter-spacing: .5px; }
.intro-sub { color: var(--fg-soft); margin: 0; font-size: .96rem; }

/* ---------- 文章列表 ---------- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-item { padding: 20px 0; border-bottom: 1px solid var(--border); }
.post-item:first-child { padding-top: 4px; }
.post-link { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.post-link:hover { text-decoration: none; }
.post-title { font-size: 1.12rem; font-weight: 600; color: var(--fg); }
.post-link:hover .post-title { color: var(--link); }
.post-date { color: var(--fg-soft); font-size: .84rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.post-summary { color: var(--fg-soft); font-size: .92rem; margin: 8px 0 0; }
.post-tags { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  color: var(--fg-soft);
  font-size: .82rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 9px;
}
.tag:hover { color: var(--link); text-decoration: none; border-color: var(--link); }

/* ---------- 文章正文 ---------- */
.page-title { font-size: 1.55rem; margin: 0 0 22px; }
.post-header { margin-bottom: 26px; }
.post-title { font-size: 1.72rem; line-height: 1.35; margin: 0 0 12px; }
.post-meta { color: var(--fg-soft); font-size: .86rem; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.post-meta .dot { color: var(--border); }
.content { font-size: 1rem; }
.content h1, .content h2, .content h3, .content h4 { line-height: 1.4; margin: 1.9em 0 .7em; font-weight: 650; }
.content h1 { font-size: 1.42rem; }
.content h2 {
  font-size: 1.26rem;
  padding-bottom: .3em;
  border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 1.1rem; }
.content p { margin: 1em 0; }
.content ul, .content ol { padding-left: 1.5em; margin: 1em 0; }
.content li { margin: .35em 0; }
.content blockquote {
  margin: 1.2em 0;
  padding: .5em 1.1em;
  border-left: 3px solid var(--link);
  background: var(--bg-soft);
  color: var(--fg-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.content blockquote p { margin: .5em 0; }
.content code {
  font-family: "JetBrains Mono", "Cascadia Code", Menlo, Consolas, "Courier New", monospace;
  font-size: .88em;
  background: var(--code-bg);
  padding: .16em .38em;
  border-radius: 4px;
}
.content pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: .87rem;
  line-height: 1.62;
  border: 1px solid var(--border);
}
.content pre code { background: none; padding: 0; font-size: inherit; }
.content table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: .92rem; display: block; overflow-x: auto; }
.content th, .content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.content th { background: var(--bg-soft); font-weight: 600; }
.content .highlight { margin: 1.2em 0; }
.content .highlight pre { margin: 0; }

/* ---------- 上下篇 ---------- */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 46px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: .9rem;
}
.post-nav a { max-width: 48%; }
.post-nav .next { text-align: right; margin-left: auto; }

/* ---------- 归档 / 标签 ---------- */
.year-heading { font-size: 1.15rem; margin: 30px 0 10px; }
.year-count { color: var(--fg-soft); font-size: .8rem; font-weight: 400; }
.archive-list { list-style: none; padding: 0; margin: 0; }
.archive-list li { display: flex; gap: 14px; padding: 6px 0; border-bottom: 1px dashed var(--border); }
.archive-list time { color: var(--fg-soft); font-size: .84rem; min-width: 52px; font-variant-numeric: tabular-nums; }
.term-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 12px; }
.term-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: 999px;
  padding: 5px 14px;
  color: var(--fg);
  font-size: .92rem;
}
.term-list a:hover { border-color: var(--link); color: var(--link); text-decoration: none; }
.term-count { color: var(--fg-soft); font-size: .78rem; }

/* ---------- 分页 ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 34px;
  font-size: .9rem;
}
.pagination .disabled { color: var(--fg-soft); opacity: .45; }
.page-info { color: var(--fg-soft); font-variant-numeric: tabular-nums; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 26px 0 34px;
  font-size: .87rem;
  color: var(--fg-soft);
  text-align: center;
}
.footer-links { display: flex; justify-content: center; gap: 18px; margin-bottom: 10px; }
.copyright, .icp { margin: 4px 0; }
.icp a { color: var(--fg-soft); }

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .intro-title { font-size: 1.55rem; }
  .post-title { font-size: 1.4rem; }
  .post-link { flex-direction: column-reverse; align-items: flex-start; gap: 4px; }
  .post-nav { flex-direction: column; }
  .post-nav a { max-width: 100%; }
  .post-nav .next { text-align: left; }
}