:root {
  --bg: #fbfaf8;
  --card: #ffffff;
  --ink: #1f2d3d;
  --sub: #6b7a89;
  --accent: #ef4444;
  --line: rgba(31, 45, 61, 0.09);
  --code-bg: #f4f6f8;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 8% -8%, #ffe9e5 0%, transparent 55%),
    radial-gradient(800px 500px at 95% 0%, #e9f1ff 0%, transparent 50%),
    var(--bg);
  min-height: 100vh;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 40px 20px 80px; }
.site-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 36px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand .mark {
  width: 44px; height: 44px; border-radius: 13px;
  display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 20px;
  background: linear-gradient(135deg, #ef4444, #f97316);
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.28);
}
.brand .name { font-size: 19px; font-weight: 700; letter-spacing: 0.5px; }
.brand .desc { font-size: 12px; color: var(--sub); margin-top: 2px; }
.home-link { font-size: 13px; color: var(--sub); text-decoration: none; }
.home-link:hover { color: var(--accent); }

.post-list { display: flex; flex-direction: column; gap: 14px; }
.post-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 22px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.post-card:hover {
  transform: translateY(-2px);
  border-color: rgba(239, 68, 68, 0.28);
  box-shadow: 0 12px 28px rgba(239, 68, 68, 0.10);
}
.post-card h2 { font-size: 18px; margin-bottom: 6px; }
.post-card .meta { font-size: 12px; color: var(--sub); letter-spacing: 0.5px; }
.post-card .summary { font-size: 14px; color: var(--sub); margin-top: 8px; }

.article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 38px;
}
.article h1 { font-size: 28px; line-height: 1.4; margin-bottom: 8px; }
.article .meta { color: var(--sub); font-size: 13px; margin-bottom: 26px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.article h2 { font-size: 21px; margin: 30px 0 12px; }
.article h3 { font-size: 17px; margin: 24px 0 10px; }
.article p { margin: 14px 0; }
.article a { color: var(--accent); text-decoration: none; border-bottom: 1px dashed rgba(239,68,68,.4); }
.article a:hover { border-bottom-style: solid; }
.article ul, .article ol { margin: 14px 0 14px 24px; }
.article li { margin: 6px 0; }
.article blockquote {
  margin: 18px 0; padding: 10px 18px;
  border-left: 3px solid var(--accent);
  background: #fff7f6; border-radius: 0 10px 10px 0;
  color: var(--sub);
}
.article code {
  background: var(--code-bg); padding: 2px 6px; border-radius: 6px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}
.article pre {
  background: #1e293b; color: #e2e8f0; padding: 16px 18px; border-radius: 12px;
  overflow-x: auto; margin: 18px 0; font-size: 13px; line-height: 1.6;
}
.article pre code { background: transparent; padding: 0; color: inherit; font-size: 13px; }
.article img { max-width: 100%; border-radius: 12px; margin: 16px 0; }
.article hr { border: 0; height: 1px; background: var(--line); margin: 30px 0; }
.article table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.article th, .article td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article th { background: #faf7f7; }

.back { display: inline-block; margin-top: 28px; color: var(--sub); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--accent); }

footer.site-foot {
  margin-top: 46px; text-align: center; color: #9aa8b6; font-size: 12px;
}
footer.site-foot a { color: inherit; text-decoration: none; }

@media (max-width: 560px) {
  .article { padding: 26px 20px; border-radius: 16px; }
  .article h1 { font-size: 23px; }
  .wrap { padding: 26px 16px 60px; }
}