:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #1e293b;
  --sub: #475569;
  --line: #dbe2ef;
  --accent: #1d4ed8;
  --max: 1000px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  line-height: 1.85;
  background:
    radial-gradient(circle at 88% -12%, rgba(59,130,246,.16), transparent 35%),
    radial-gradient(circle at 6% -15%, rgba(37,99,235,.10), transparent 38%),
    var(--bg);
}
header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav, main, footer { width: min(var(--max), 92vw); margin: 0 auto; }
.nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { text-decoration: none; color: var(--ink); font-weight: 700; }
.brand small { display: block; color: var(--sub); font-size: 12px; font-weight: 500; }
.hero {
  margin-top: 22px;
  background: linear-gradient(135deg, #fff, #eef3ff);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
}
.hero h1 { margin: 0 0 10px; font-size: clamp(24px, 3.2vw, 34px); line-height: 1.3; }
.hero p { margin: 0; color: var(--sub); }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); margin: 20px 0 38px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h2 { margin: 0; font-size: 18px; line-height: 1.45; }
.card p { margin: 0; color: var(--sub); font-size: 14px; }
.meta { font-size: 12px; color: #64748b; }
.link { color: var(--accent); text-decoration: none; font-weight: 600; }
.link:hover { text-decoration: underline; }
article.post {
  margin: 24px auto 40px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
}
article.post h1 { margin: 0 0 10px; font-size: clamp(24px,3.1vw,33px); line-height: 1.34; }
article.post h2 { margin: 22px 0 8px; font-size: 20px; }
article.post h3 { margin: 16px 0 8px; font-size: 17px; }
article.post p { margin: 0 0 12px; }
article.post ul, article.post ol { margin: 0 0 14px 20px; }
article.post table { width: 100%; border-collapse: collapse; margin: 10px 0 14px; }
article.post th, article.post td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; font-size: 14px; }
blockquote {
  margin: 12px 0;
  padding: 10px 14px;
  border-left: 3px solid #1d4ed8;
  background: #eef4ff;
}
footer { border-top: 1px solid var(--line); color: var(--sub); font-size: 13px; padding: 20px 0 34px; }
@media (max-width: 700px) { .hero, article.post { padding: 18px; } }