:root{
  --fg:#16181d; --fg-soft:#4b5563; --bg:#fbfbfc; --card:#ffffff;
  --line:#e5e7eb; --accent:#2f6df6; --accent-soft:#eef3ff; --radius:12px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:820px; margin:0 auto; padding:0 24px}
.site-header{border-bottom:1px solid var(--line); background:rgba(255,255,255,.9); position:sticky; top:0; backdrop-filter:blur(8px); z-index:10}
.site-header .container{display:flex; align-items:center; justify-content:space-between; height:64px}
.logo{display:flex; align-items:center; gap:10px; font-weight:700; color:var(--fg); font-size:17px}
.logo-mark{display:inline-flex; align-items:center; justify-content:center; width:30px; height:30px; border-radius:8px; background:var(--accent); color:#fff; font-size:12px; letter-spacing:.5px}
.nav{display:flex; gap:26px; font-size:14.5px}
.nav a{color:var(--fg-soft)}
.nav a:hover{color:var(--accent); text-decoration:none}
.hero{padding:76px 0 48px}
.eyebrow{margin:0 0 16px; font-size:13px; letter-spacing:1.5px; color:var(--accent); text-transform:uppercase; font-weight:600}
.hero h1{margin:0 0 20px; font-size:clamp(30px,5vw,44px); line-height:1.25; letter-spacing:-.5px}
.lead{margin:0 0 30px; font-size:17px; color:var(--fg-soft); max-width:62ch}
.hero-actions{display:flex; gap:12px; flex-wrap:wrap}
.btn{display:inline-block; padding:10px 20px; border-radius:999px; border:1px solid var(--line); background:#fff; color:var(--fg); font-size:14.5px; transition:.15s}
.btn:hover{text-decoration:none; border-color:#cfd6e0}
.btn-primary{background:var(--accent); border-color:var(--accent); color:#fff}
.btn-primary:hover{background:#2258d8}
.grid-3{display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:18px; padding-bottom:8px}
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:22px}
.card h3{margin:0 0 8px; font-size:16px}
.card p{margin:0 0 14px; font-size:14.5px; color:var(--fg-soft)}
.card a{font-size:14px}
.posts{padding:52px 0 24px}
.posts h2{font-size:20px; margin:0 0 18px; padding-bottom:12px; border-bottom:1px solid var(--line)}
.post-list{list-style:none; margin:0; padding:0}
.post-list li{display:flex; gap:20px; align-items:baseline; padding:12px 0; border-bottom:1px dashed var(--line)}
.post-list time{font-size:13px; color:#9aa3af; font-variant-numeric:tabular-nums; flex:0 0 96px}
.site-footer{border-top:1px solid var(--line); margin-top:56px; padding:28px 0; color:#9aa3af; font-size:13.5px}
.site-footer p{margin:0}
article.doc{padding:56px 0 24px}
article.doc h1{font-size:32px; margin:0 0 10px}
article.doc h2{font-size:21px; margin:44px 0 12px; padding-top:10px; border-top:1px solid var(--line); scroll-margin-top:80px}
article.doc p, article.doc li{color:var(--fg-soft)}
article.doc code{background:#f1f3f7; padding:2px 6px; border-radius:5px; font-size:13.5px; color:#b3205a}
pre{background:#16181d; color:#e6e8ee; padding:16px 18px; border-radius:10px; overflow:auto; font-size:13.5px; line-height:1.6}
pre code{background:none; color:inherit; padding:0}
.meta{color:#9aa3af; font-size:13.5px; margin:0 0 8px}
@media(prefers-color-scheme:dark){
  :root{--fg:#e8eaef; --fg-soft:#a3aab6; --bg:#0f1115; --card:#16191f; --line:#272c34; --accent:#6f9bff; --accent-soft:#1a2333}
  .site-header{background:rgba(15,17,21,.9)}
  .btn{background:var(--card); color:var(--fg)}
  .btn-primary{background:var(--accent); border-color:var(--accent); color:#0f1115}
  article.doc code{background:#1c2027; color:#ff8ab0}
}