/* Core layout */
:root{
  --bg:#0b1220;
  --panel:#0f1b33;
  --card:#0d1730;
  --text:#eaf0ff;
  --muted:#b7c4e6;
  --brand:#2f6bff;
  --brand2:#2ad1ff;
  --border:rgba(255,255,255,.10);
  --shadow:0 18px 50px rgba(0,0,0,.35);
  --radius:16px;
  --max:1120px;
  --font:ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(900px 500px at 15% 10%, rgba(47,107,255,.28), transparent 60%),
    radial-gradient(900px 520px at 80% 15%, rgba(42,209,255,.22), transparent 62%),
    radial-gradient(700px 480px at 60% 95%, rgba(47,107,255,.18), transparent 60%),
    var(--bg);
  line-height:1.7;
}

a{color:inherit}
.container{max-width:var(--max);margin:0 auto;padding:0 16px}

/* Header + nav */
.site-header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(180%) blur(12px);
  background:rgba(11,18,32,.62);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  min-height:64px;
}
.brand{
  display:flex;gap:10px;align-items:center;
  text-decoration:none;
}
.brand img{width:34px;height:34px;border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.28)}
.brand strong{letter-spacing:.2px}
.badge{
  font-size:12px;
  padding:3px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  color:var(--muted);
}
.nav-links{
  display:flex;gap:14px;align-items:center;flex-wrap:wrap;
}
.nav-links a{
  text-decoration:none;
  color:var(--muted);
  padding:8px 10px;
  border-radius:10px;
  border:1px solid transparent;
}
.nav-links a:hover{color:var(--text);border-color:var(--border);background:rgba(255,255,255,.04)}
.nav-links a[aria-current="page"]{
  color:var(--text);
  background:linear-gradient(90deg, rgba(47,107,255,.20), rgba(42,209,255,.16));
  border-color:rgba(47,107,255,.28);
}

.cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  border-radius:12px;
  text-decoration:none;
  background:linear-gradient(90deg, rgba(47,107,255,.95), rgba(42,209,255,.85));
  color:#061022;
  font-weight:700;
  box-shadow:0 14px 30px rgba(47,107,255,.25);
}
.cta:focus,.nav-links a:focus,.hamburger:focus,.btn:focus,.input:focus{outline:2px solid rgba(42,209,255,.7);outline-offset:2px}

.hamburger{
  display:none;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:var(--text);
  border-radius:12px;
  padding:10px 12px;
}
.hamburger-lines{
  width:20px;height:14px;display:grid;gap:3px;
}
.hamburger-lines span{display:block;height:2px;border-radius:2px;background:var(--text);opacity:.9}

/* Mobile menu */
.mobile-panel{
  display:none;
  border-top:1px solid var(--border);
  background:rgba(11,18,32,.86);
}
.mobile-panel.open{display:block}
.mobile-links{
  display:grid;gap:8px;
  padding:14px 16px 18px 16px;
}
.mobile-links a{
  text-decoration:none;
  color:var(--muted);
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.02);
}
.mobile-links a:hover{color:var(--text);background:rgba(255,255,255,.05)}

/* Hero */
.hero{
  padding:42px 0 18px 0;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap:18px;
  align-items:stretch;
}
.hero-card{
  border:1px solid var(--border);
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
}
.kicker{
  color:var(--muted);
  font-weight:600;
  letter-spacing:.3px;
}
h1{margin:10px 0 10px 0;line-height:1.2;font-size:34px}
.lead{color:var(--muted);margin:0}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 14px;
  border-radius:12px;
  border:1px solid var(--border);
  text-decoration:none;
  background:rgba(255,255,255,.03);
  color:var(--text);
  font-weight:700;
}
.btn.primary{
  border-color:rgba(47,107,255,.35);
  background:linear-gradient(90deg, rgba(47,107,255,.95), rgba(42,209,255,.85));
  color:#061022;
}
.btn.ghost{color:var(--muted)}
.hero-illustration{
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  background:rgba(255,255,255,.03);
  box-shadow:var(--shadow);
  min-height:260px;
  display:grid;
  align-content:center;
  padding:18px;
}
.hero-illustration img{
  width:100%;
  height:auto;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.10);
}
.mini{
  color:var(--muted);
  font-size:13px;
  margin-top:10px;
}

/* Content */
main{padding-bottom:40px}
.section{padding:18px 0}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card{
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  border-radius:var(--radius);
  padding:16px;
}
.card h3{margin:0 0 6px 0;font-size:18px}
.card p{margin:0;color:var(--muted)}
.split{
  display:grid;
  grid-template-columns: .95fr 1.05fr;
  gap:18px;
  align-items:start;
}
.content{
  border:1px solid var(--border);
  background:rgba(255,255,255,.02);
  border-radius:var(--radius);
  padding:18px;
}
.content h2{margin:0 0 8px 0;font-size:22px}
.content h3{margin:16px 0 6px 0;font-size:18px}
.content p{margin:0 0 12px 0;color:var(--muted)}
.content ul{margin:0 0 12px 18px;color:var(--muted)}
.content li{margin:4px 0}
.toc{
  position:sticky;top:84px;
}
.toc a{display:block;text-decoration:none;color:var(--muted);padding:8px 10px;border-radius:12px;border:1px solid var(--border);background:rgba(255,255,255,.02);margin-bottom:8px}
.toc a:hover{color:var(--text);background:rgba(255,255,255,.05)}

/* Forms */
.form{
  display:grid;gap:12px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  border-radius:var(--radius);
  padding:18px;
}
label{font-weight:700;color:var(--text)}
.input{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:rgba(11,18,32,.35);
  color:var(--text);
}
.help{color:var(--muted);font-size:13px;margin-top:-6px}
.form-row{display:grid;gap:8px}
.form-actions{display:flex;gap:10px;flex-wrap:wrap}
.note{
  border-left:4px solid rgba(42,209,255,.55);
  padding:12px 12px;
  border-radius:12px;
  background:rgba(42,209,255,.08);
  color:var(--muted);
}

/* Footer */
.site-footer{
  border-top:1px solid var(--border);
  padding:22px 0 30px 0;
  background:rgba(11,18,32,.58);
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:14px;
  align-items:start;
}
.footer-links{display:flex;flex-wrap:wrap;gap:10px}
.footer-links a{
  color:var(--muted);
  text-decoration:none;
  padding:8px 10px;border:1px solid var(--border);border-radius:12px;background:rgba(255,255,255,.02)
}
.footer-links a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.copyright{color:var(--muted);font-size:13px;margin:8px 0 0 0}

/* Utility */
.pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:var(--muted);
  font-size:13px;
}
.pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.hr{height:1px;background:var(--border);margin:14px 0}
.muted{color:var(--muted)}
.small{font-size:13px}
.center{text-align:center}

/* Responsive */
@media (max-width: 920px){
  .hero-grid{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .toc{position:relative;top:auto}
  .grid-3{grid-template-columns:1fr}
}

@media (max-width: 780px){
  .nav-links{display:none}
  .hamburger{display:inline-flex;align-items:center;gap:10px}
  h1{font-size:28px}
  .footer-grid{grid-template-columns:1fr}
}