:root {
  --ink: #2f343b;
  --muted: #6b7280;
  --faint: #9ca3af;
  --blue: #2563eb;
  --dark: #20242b;
  --dark-2: #2f343d;
  --line: #e5e7eb;
  --bg: #f4f5f7;
  --card: #fff;
  --soft: #f8fafc;
  --red-bg: #fff1f2;
  --red: #be123c;
  --width: 1120;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
p { margin: 0 0 1rem; }
h1,h2,h3,h4 { margin: 0; line-height: 1.35; font-weight: 750; }
.blog-masthead { background: linear-gradient(135deg, #20242b, #343943); color: #fff; border-bottom: 1px solid #111827; }
.blog-masthead .inner { max-width: 1120px; margin: 0 auto; padding: 28px 22px 22px; }
.brand-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.blog-logo h1 { font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 31px; letter-spacing: .02em; }
.blog-logo h1 a { color: #fff; }
.blog-logo p { margin: 4px 0 0; color: #d1d5db; font-size: 14px; }
.blog-nav { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.blog-nav a { color: #e5e7eb; font-size: 14px; }
.blog-nav a:hover { color: #fff; }
.announcement { margin-top: 18px; padding: 10px 14px; border-radius: 6px; background: rgba(255,255,255,.08); color: #f3f4f6; font-size: 14px; }
.layout { max-width: 1120px; margin: 24px auto 54px; padding: 0 22px; display: grid; grid-template-columns: minmax(0,1fr) 285px; gap: 24px; align-items:start; }
.post-card { background: var(--card); box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 30px 34px; margin-bottom: 16px; transition: box-shadow .2s ease, transform .2s ease; }
.post-card:hover { box-shadow: 0 10px 28px rgba(17,24,39,.12); transform: translateY(-1px); }
.post-card h2 { font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 29px; line-height: 1.35; margin-bottom: 8px; }
.post-card h2 a { color: #374151; }
.post-card h2 a:hover { color: var(--blue); }
.post-meta { display: flex; flex-wrap: wrap; gap: 8px 13px; align-items: center; color: var(--muted); font-size: 13px; margin-bottom: 16px; }
.post-meta a { color: var(--muted); font-weight: 600; }
.excerpt { color: #4b5563; font-size: 15px; }
.read-more { margin-top: 18px; padding-top: 16px; border-top: 1px dashed #d1d5db; text-align: right; }
.read-more a { display: inline-flex; gap: 6px; align-items: center; background: #374151; color: #fff; padding: 8px 14px; font-size: 13px; }
.read-more a:hover { background: var(--blue); text-decoration: none; }
.sidebar-widget { background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 22px; margin-bottom: 16px; }
.sidebar-widget h3 { font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 20px; margin-bottom: 12px; color: #374151; }
.sidebar-widget p, .sidebar-widget li { color: var(--muted); font-size: 14px; }
.sidebar-widget ul { padding-left: 1.1rem; margin: 0; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 7px; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 3px; background: var(--red-bg); color: var(--red); border: 1px solid #fecdd3; font-size: 12px; }
.tag.blue { background: #eff6ff; color: #1d4ed8; border-color: #bfdbfe; }
.tag.gray { background: #f3f4f6; color: #4b5563; border-color: #e5e7eb; }
.article-shell { max-width: 820px; margin: 28px auto 60px; padding: 0 22px; }
.article-card { background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 42px 54px 48px; }
.article-card h1 { font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 36px; margin-bottom: 12px; color: #29303b; }
.article-body { font-size: 16.5px; color: #374151; }
.article-body h2 { font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 26px; margin: 38px 0 14px; color: #253044; }
.article-body h3 { font-size: 19px; margin: 26px 0 9px; color: #253044; }
.article-body blockquote { margin: 22px 0; padding: 16px 20px; border-left: 4px solid var(--blue); background: #f8fafc; color: #4b5563; }
.article-body code { background: #f3f4f6; padding: 2px 5px; border-radius: 3px; font-size: .92em; }
.article-body pre { overflow: auto; background: #f3f4f6; padding: 16px; border-radius: 6px; }
.article-body .key { background: #fff7cc; padding: 0 3px; }
.toc { background: #f8fafc; border: 1px solid var(--line); padding: 16px 20px; margin: 24px 0 30px; font-size: 14px; }
.toc h3 { font-size: 15px; margin-bottom: 6px; }
.toc ol { margin: 0; padding-left: 1.3rem; color: var(--muted); }
.article-footer { margin-top: 38px; padding-top: 20px; border-top: 1px dashed #d1d5db; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.archive-list { background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 28px 34px; }
.archive-list h2 { font-family: Georgia, "Times New Roman", "Songti SC", serif; margin: 22px 0 8px; color: #374151; }
.archive-row { display: grid; grid-template-columns: 108px 1fr; gap: 16px; padding: 10px 0; border-bottom: 1px solid #f1f2f4; }
.archive-row:last-child { border-bottom: 0; }
.archive-date { color: var(--faint); font-size: 14px; }
.blog-footer { border-top: 1px solid #d7dbe1; background: #fff; color: var(--muted); padding: 24px 0; font-size: 13px; }
.blog-footer .inner { max-width: 1120px; margin: 0 auto; padding: 0 22px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } .article-card { padding: 30px 24px; } .article-card h1 { font-size: 30px; } }
@media (max-width: 640px) { .blog-logo h1 { font-size: 25px; } .post-card { padding: 24px 20px; } .post-card h2 { font-size: 23px; } .archive-row { grid-template-columns: 1fr; gap: 2px; } .blog-nav { gap: 12px; } }
.article-figure { margin: 24px 0 28px; }
.article-figure img { display: block; width: 100%; border: 1px solid #e5e7eb; border-radius: 6px; background: #fff; }
.article-figure figcaption { margin-top: 9px; color: var(--muted); font-size: 14px; text-align: center; }
.article-body table { width: 100%; border-collapse: collapse; margin: 18px 0 24px; font-size: 15px; }
.article-body th, .article-body td { border: 1px solid #e5e7eb; padding: 9px 11px; text-align: left; vertical-align: top; }
.article-body th { background: #f8fafc; color: #374151; }