:root { --primary:#6366F1; --primary-600:#4F46E5; --accent:#22C55E; --danger:#EF4444;
  --bg:#F8FAFC; --surface:#FFFFFF; --muted:#6B7280; --text:#0F172A; --ring:#E5E7EB; }
*{box-sizing:border-box} html,body{margin:0;padding:0;height:100%}
body{font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Ubuntu,Cantarell,'Helvetica Neue',Arial;color:var(--text);background:var(--bg);display:flex;min-height:100vh;flex-direction:column}
main{flex:1 0 auto}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--ring)}
.nav{height:64px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;display:flex;gap:8px;align-items:center}
.brand .mark{background:linear-gradient(135deg,#F43F5E,#F97316);color:#fff;padding:4px 8px;border-radius:10px}
.links{display:flex;gap:10px;align-items:center}
.links a{color:var(--text);text-decoration:none;padding:10px 14px;border-radius:10px;font-weight:600}
.links a.active,.links a:hover{background:#EEF2FF}
.content{max-width:800px;margin:0 auto;padding:40px 20px}
h1{font-size:32px;font-weight:800;margin-bottom:20px}
h2{font-size:24px;font-weight:700;margin:30px 0 15px 0;color:var(--primary)}
h3{font-size:20px;font-weight:600;margin:25px 0 10px 0}
p{line-height:1.6;margin-bottom:15px;color:#374151}
ul{margin:10px 0 15px 20px}
li{margin-bottom:8px;line-height:1.6}
.highlight{background:#FEF3C7;padding:15px;border-radius:8px;margin:20px 0;border-left:4px solid #F59E0B}
.updated{color:var(--muted);font-size:14px;margin-bottom:30px}
.cart{position:relative;display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;background:var(--surface);border:1px solid var(--ring);cursor:pointer}
.cart:hover{border-color:#CBD5E1;background:#FFF} .cart svg{width:22px;height:22px}
.badge{position:absolute;top:-6px;right:-6px;background:linear-gradient(135deg,#F43F5E,#EF4444);color:#fff;border-radius:999px;padding:2px 6px;font-size:11px;display:none}

/* Mobile Responsive */
@media (max-width: 768px) {
  .container{padding:0 16px}
  .nav{height:56px;flex-wrap:wrap}
  .links{display:flex}
  .links a{display:none}
  .content{padding:30px 16px}
  h1{font-size:28px}
  h2{font-size:22px}
  h3{font-size:18px}
}

footer{margin-top:auto;border-top:1px solid var(--ring);background:var(--surface)}
.foot{padding:22px 0;text-align:center;color:#64748B;font-size:13px}