:root{
  --bg:#ffffff;
  --text:#222;
  --muted:#666;
  --primary:#0b57d0;
  --border:#eaeaea;
  --card:#f7f9fc;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:980px;margin:0 auto;padding:0 20px}
.header{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:saturate(140%) blur(6px);border-bottom:1px solid var(--border);z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:600}
.brand .logo{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#0b57d0,#6aa5ff)}
.navlinks{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-block;padding:8px 14px;border:1px solid var(--border);border-radius:10px;background:#fff;color:var(--text)}
.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.hero{padding:48px 0;background:linear-gradient(180deg,#f3f6ff,#fff);border-bottom:1px solid var(--border)}
.hero h1{font-size:36px;line-height:1.2;margin:0 0 10px}
.hero p{color:var(--muted);max-width:760px;margin:0}
.grid{display:grid;grid-template-columns:1fr;gap:16px;padding:24px 0}
@media(min-width:768px){.grid{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px}
.section h2{margin:0 0 8px;font-size:20px}
.section p{color:var(--muted)}
.footer{border-top:1px solid var(--border);padding:18px;color:var(--muted);text-align:center;margin-top:24px}
.article{max-width:900px;margin:0 auto;padding:24px 20px}
.article h1{font-size:28px;margin:0 0 8px}
.meta{color:var(--muted);margin-bottom:16px}
pre{white-space:pre-wrap;word-wrap:break-word;background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px;font:14px/1.6 ui-monospace,Menlo,Consolas,monospace}