:root{
  --bg:#f8f9fb; --card:#ffffff; --ink:#1f2937; --muted:#6b7280;
  --brand:#2563eb; --brand-dark:#1d4ed8; --line:#e5e7eb;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:860px;margin:0 auto;padding:0 20px}
header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-size:20px;font-weight:800;color:var(--ink);letter-spacing:-.5px}
.logo span{color:var(--brand)}
.nav-links{display:flex;gap:22px;font-size:15px}
.nav-links a{color:var(--muted);font-weight:500}
.nav-links a.active,.nav-links a:hover{color:var(--brand);text-decoration:none}
main{min-height:calc(100vh - 160px)}
.hero{padding:70px 0 40px;text-align:center}
.hero h1{font-size:36px;font-weight:800;letter-spacing:-1px;margin-bottom:14px}
.hero p{color:var(--muted);font-size:17px;max-width:560px;margin:0 auto}
.hero .badge{display:inline-block;background:#eef2ff;color:var(--brand-dark);padding:5px 14px;border-radius:999px;font-size:13px;font-weight:600;margin-bottom:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;padding:20px 0 60px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.06)}
.card h3{font-size:17px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}
.card .meta{font-size:12px;color:#9ca3af;margin-top:12px}
.page{padding:50px 0 60px}
.page h1{font-size:28px;margin-bottom:20px;letter-spacing:-.5px}
.page p{margin-bottom:14px;color:var(--ink)}
.page .muted{color:var(--muted)}
footer{background:var(--card);border-top:1px solid var(--line);padding:24px 0;text-align:center;font-size:13px;color:var(--muted)}
footer a{color:var(--muted)}
.footer-links{margin-top:6px}
@media(max-width:600px){.hero h1{font-size:28px}.nav-links{gap:14px;font-size:14px}}