/* 极简样式 —— 手写，无依赖 */
:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --code-bg: #f6f8fa;
  --link: #0969da;
  --max: 46rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --fg: #e6e6e6;
    --muted: #9099a8;
    --border: #2b2f36;
    --code-bg: #1e2128;
    --link: #6cb6ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* 页头 */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-bottom: 2.5rem;
}
.site-header .wrap { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.site-nav { margin-left: auto; display: flex; gap: 1.1rem; font-size: .9rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--link); }

/* 站点标题 */
.site-title { font-size: 1.15rem; font-weight: 600; color: var(--fg); text-decoration: none; }

/* 搜索框 */
.search { margin: 0 0 2rem; }
.search input {
  width: 100%; padding: .7rem 1rem;
  font: inherit; font-size: .95rem;
  color: var(--fg); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px;
  outline: none;
}
.search input::placeholder { color: var(--muted); }
.search input:focus { border-color: var(--link); }

.no-hit { color: var(--muted); font-size: .9rem; padding: 1rem 0; }

/* 首页 —— 分类卡片 */
.cats {
  display: grid; gap: .9rem; margin-bottom: 3rem;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
}
.cat-card {
  display: flex; flex-direction: column; gap: .3rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border); border-radius: 10px;
  text-decoration: none; color: inherit;
  transition: border-color .15s, transform .15s;
}
.cat-card:hover { border-color: var(--link); transform: translateY(-2px); }
.cat-name { font-size: 1rem; font-weight: 600; color: var(--fg); }
.cat-desc { font-size: .82rem; color: var(--muted); line-height: 1.45; }
.cat-count {
  margin-top: .35rem; font-size: .75rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: .04em;
}

.section-title {
  font-size: 1.15rem; font-weight: 600; margin: 0 0 .3rem;
}

/* 文章列表 */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  display: flex; align-items: baseline; gap: 1rem;
  padding: .7rem 0; border-bottom: 1px solid var(--border);
}
.post-list li:last-child { border-bottom: none; }
.post-list time {
  color: var(--muted); font-size: .82rem; white-space: nowrap;
  font-variant-numeric: tabular-nums; min-width: 6.5rem;
}
.post-list li > a:first-of-type { color: var(--fg); text-decoration: none; flex: 1; }
.post-list li > a:first-of-type:hover { color: var(--link); }
.post-list .tag {
  font-size: .72rem; color: var(--muted); text-decoration: none;
  border: 1px solid var(--border); border-radius: 999px;
  padding: .1rem .5rem; white-space: nowrap;
}
.post-list .tag:hover { color: var(--link); border-color: var(--link); }

/* 分类页 */
.page-title { font-size: 1.5rem; font-weight: 600; margin: 0 0 .4rem; }
.page-desc { color: var(--muted); font-size: .9rem; margin: 0 0 1.8rem; }
.back-link { margin-top: 2rem; font-size: .88rem; }
.back-link a { color: var(--muted); text-decoration: none; }
.back-link a:hover { color: var(--link); }

/* 文章页 */
article { padding-bottom: 3rem; }
.article-header { margin-bottom: 2rem; }
.article-title { font-size: 1.7rem; line-height: 1.3; margin: 0 0 .6rem; }
.article-meta { color: var(--muted); font-size: .85rem; display: flex; gap: .9rem; flex-wrap: wrap; }

.article-body h2 {
  font-size: 1.3rem; margin: 2.2rem 0 .8rem;
  padding-bottom: .3rem; border-bottom: 1px solid var(--border);
}
.article-body h3 { font-size: 1.1rem; margin: 1.8rem 0 .6rem; }
.article-body p { margin: 1rem 0; }
.article-body a { color: var(--link); }
.article-body ul, .article-body ol { padding-left: 1.5rem; }
.article-body li { margin: .35rem 0; }
.article-body blockquote {
  margin: 1.2rem 0; padding: .3rem 1rem;
  border-left: 3px solid var(--border); color: var(--muted);
}
.article-body img { max-width: 100%; height: auto; }
.article-body hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.article-body table {
  border-collapse: collapse; width: 100%; margin: 1.2rem 0;
  font-size: .92rem; display: block; overflow-x: auto;
}
.article-body th, .article-body td {
  border: 1px solid var(--border); padding: .5rem .7rem; text-align: left;
}
.article-body th { background: var(--code-bg); }

.article-body pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: .9rem 1rem; overflow-x: auto;
  font-size: .86rem; line-height: 1.6;
}
.article-body code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;
}
.article-body :not(pre) > code {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 4px; padding: .12em .38em; font-size: .88em;
}
.article-body details {
  border: 1px solid var(--border); border-radius: 6px;
  padding: .6rem 1rem; margin: 1.2rem 0;
}
.article-body summary { cursor: pointer; font-weight: 600; }

/* 标签 */
.tags { margin-top: 2.5rem; padding-top: 1.2rem; border-top: 1px solid var(--border); font-size: .85rem; }
.tags a {
  display: inline-block; margin: 0 .4rem .4rem 0; padding: .15rem .6rem;
  border: 1px solid var(--border); border-radius: 999px;
  color: var(--muted); text-decoration: none;
}
.tags a:hover { color: var(--link); border-color: var(--link); }

/* 目录 */
.toc {
  border: 1px solid var(--border); border-radius: 6px;
  padding: .8rem 1rem; margin: 0 0 2rem; font-size: .9rem;
}
.toc-title { font-weight: 600; margin-bottom: .4rem; font-size: .85rem; color: var(--muted); }
.toc ul { margin: 0; padding-left: 1.2rem; }
.toc li { margin: .2rem 0; }
.toc a { color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--link); }

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border); margin-top: 3rem;
  padding: 1.5rem 0 3rem; color: var(--muted); font-size: .82rem;
}
.site-footer a { color: var(--muted); }

/* 归档 */
.archive-year { font-size: 1.15rem; font-weight: 600; margin: 2rem 0 .6rem; }

@media (max-width: 600px) {
  .post-list li { flex-direction: column; gap: .15rem; }
  .article-title { font-size: 1.4rem; }
}