:root{--brand:#4f46e5;--brand-dark:#4338ca;}
*{scroll-behavior:smooth;}
body{font-family:'PingFang SC','Microsoft YaHei','Segoe UI',system-ui,-apple-system,sans-serif;color:#111827;}
.gradient-text{background:linear-gradient(135deg,#4f46e5,#6366f1,#3b82f6);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.bg-grid{background-image:radial-gradient(rgba(99,102,241,.10) 1px,transparent 1px);background-size:24px 24px;}
.nav-blur{backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);}
.card-hover{transition:transform .3s ease,box-shadow .3s ease;}
.card-hover:hover{transform:translateY(-6px);box-shadow:0 20px 40px -12px rgba(79,70,229,.28);}
.btn-glow{transition:all .3s ease;}
.btn-glow:hover{box-shadow:0 12px 30px -6px rgba(79,70,229,.5);transform:translateY(-2px);}
.fade-in{animation:fadeIn .7s ease both;}
@keyframes fadeIn{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:none;}}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-item.active .faq-answer{max-height:320px;}
.faq-item.active .faq-icon{transform:rotate(180deg);}
.faq-icon{transition:transform .3s ease;}