::selection{background:#00b4d8;color:#fff}
::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#1e3a5f,#00b4d8);border-radius:10px}
.btn-primary,.btn-accent{box-shadow:0 6px 20px rgba(0,180,216,.35)}
.btn-primary:hover,.btn-accent:hover{box-shadow:0 10px 28px rgba(0,180,216,.5)}
#backTop{position:fixed;right:22px;bottom:22px;width:48px;height:48px;border-radius:50%;border:none;background:linear-gradient(135deg,#7c3aed,#00b4d8);color:#fff;font-size:1.1rem;cursor:pointer;opacity:0;pointer-events:none;transition:.3s;z-index:2000;box-shadow:0 8px 24px rgba(2,6,23,.3)}
#backTop.show{opacity:1;pointer-events:auto}
#backTop:hover{transform:translateY(-3px)}
header.scrolled{background:rgba(255,255,255,.98)}