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rgba(255,255,255,.1);color:var(--neon);border-radius:50%;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center;opacity:0;transform:translateY(20px);transition:all .3s;z-index:999}.back-top.visible{opacity:1;transform:translateY(0)}.back-top:hover{border-color:var(--neon);box-shadow:0 0 20px #00d4ff33;transform:translateY(-3px)}.mobile-nav{display:none;position:fixed;inset:0;background:#0d1b2afa;z-index:999;flex-direction:column;align-items:center;justify-content:center;gap:30px;backdrop-filter:blur(20px)}.mobile-nav.open{display:flex}.mobile-nav a{color:#fff;font-size:20px;transition:color .3s}.mobile-nav a:hover{color:var(--neon)}.mobile-nav-close{position:absolute;top:20px;right:25px;color:#fff;font-size:30px;background:none;border:none;cursor:pointer}@media(max-width:768px){.header nav{display:none}.menu-btn{display:block}.hero{min-height:auto;padding:120px 0 80px}.hero-stats{flex-direction:column;gap:15px}.contact .wrap,.footer .wrap{grid-template-columns:1fr}.tabs{flex-direction:column;align-items:center}.line-float{bottom:80px;right:15px}.back-top{bottom:20px;right:15px}}