/* 轻量响应式样式 */
:root{
  --bg:#0f1724;
  --card:#0b1220;
  --muted:#9aa4b2;
  --accent:#60a5fa;
  --glass: rgba(255,255,255,0.03);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:linear-gradient(180deg,var(--bg), #081020 100%);
  color:#e6eef6;
  -webkit-font-smoothing:antialiased;
}
n/* header */
.site-header{backdrop-filter: blur(6px);}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 24px;max-width:1100px;margin:0 auto;
}
.brand{font-weight:700;font-size:1.05rem}
.nav-links{list-style:none;display:flex;gap:18px;margin:0;padding:0}
.nav-links a{color:var(--muted);text-decoration:none}
.nav-toggle{display:none;background:none;border:0;color:var(--muted);font-size:1.2rem}
/* hero */
.hero{max-width:1100px;margin:48px auto;padding:40px 24px;text-align:center}
.hero .name{color:var(--accent)}
.tagline{color:var(--muted);margin-top:8px}
.btn{display:inline-block;margin-top:18px;padding:10px 16px;background:var(--accent);color:#04263b;border-radius:8px;text-decoration:none;font-weight:600}
/* content sections */
main{max-width:1100px;margin:0 auto;padding:24px}
section{background:var(--glass);padding:20px;border-radius:12px;margin-bottom:18px}
h2{margin-top:0}
.skills{display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:12px 0 0 0}
.skills li{background:rgba(255,255,255,0.03);padding:6px 10px;border-radius:8px;font-size:0.95rem}
.project-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.project{background:rgba(255,255,255,0.02);padding:14px;border-radius:10px}
.project a{color:var(--accent)}
.site-footer{text-align:center;color:var(--muted);padding:24px}
/* responsive */
@media (max-width:720px){
  .nav-toggle{display:block}
  .nav-links{position:absolute;right:16px;top:64px;flex-direction:column;background:#081224;padding:12px;border-radius:8px;display:none}
  .nav-links.open{display:flex}
}