.back-to-top-wrapper{position:fixed;bottom:30px;right:30px;width:36px;height:36px;z-index:1998199;opacity:0;visibility:hidden;transform:translateY(20px);transition:all 0.4s cubic-bezier(0.175,0.885,0.32,1.275);pointer-events:none}.back-to-top-wrapper.show{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}.back-to-top-btn{width:100%;height:100%;position:relative;border:none;border-radius:20px;background:linear-gradient(135deg,#4361ee,#0096c7,#00b4d8,#7209b7);background-size:300% 300%;color:white;font-size:17px;cursor:pointer;box-shadow:0 5px 15px rgba(0,0,0,0.3);display:flex;align-items:center;justify-content:center;overflow:hidden;z-index:2;animation:gradientShift 4s ease infinite}.back-to-top-btn::after{content:'';position:absolute;top:-50%;left:-150%;width:80%;height:200%;background:linear-gradient(to right,transparent,rgba(255,255,255,0.2),transparent);transform:rotate(25deg);pointer-events:none;transition:none}.back-to-top-wrapper.show:hover .back-to-top-btn::after{animation:light-sweep 1.5s ease-in-out infinite}.back-to-top-wrapper.show:hover .back-to-top-btn{transform:translateY(-1px) scale(1.01);box-shadow:0 0 20px rgba(67,97,238,0.8),0 0 40px rgba(0,150,199,0.6),0 8px 20px rgba(0,0,0,0.4);animation:gradientShift 4s ease infinite,pulse-glow 1.5s ease infinite}.back-to-top-btn:active{transform:translateY(-1px) scale(1.01)!important;transition:transform 0.1s ease}.back-to-top-btn i{position:relative;z-index:3;transition:transform 0.3s ease}.back-to-top-wrapper.show:hover .back-to-top-btn i{animation:icon-bounce 1.8s ease infinite}.ripple-container{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.ripple-wave{position:absolute;top:0;left:0;width:100%;height:100%;border-radius:20px;border:3px solid rgba(0,198,255,0.8);opacity:0;animation:ripple-expand 4s ease-out infinite;box-shadow:0 0 15px rgba(0,198,255,0.6)}.ripple-wave.r1{border-color:#4361ee;box-shadow:0 0 15px rgba(67,97,238,0.6)}.ripple-wave.r2{border-color:#0096c7;box-shadow:0 0 15px rgba(0,150,199,0.6);animation-delay:1s}.ripple-wave.r3{border-color:#00b4d8;box-shadow:0 0 15px rgba(0,180,216,0.6);animation-delay:2s}.back-to-top-wrapper.show:hover .ripple-wave{animation-play-state:paused;opacity:0;transition:opacity 0.4s}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}@keyframes light-sweep{0%{left:-150%}100%{left:200%}}@keyframes pulse-glow{0%,100%{box-shadow:0 0 20px rgba(67,97,238,0.8),0 0 40px rgba(0,150,199,0.4),0 8px 20px rgba(0,0,0,0.4)}50%{box-shadow:0 0 35px rgba(67,97,238,1),0 0 60px rgba(0,150,199,0.6),0 8px 25px rgba(0,0,0,0.5)}}@keyframes icon-bounce{0%,100%{transform:translateY(0)}25%{transform:translateY(-1px)}50%{transform:translateY(0)}75%{transform:translateY(-0.5px)}}@keyframes ripple-expand{0%{transform:scale(1);opacity:0.7;border-width:3px}100%{transform:scale(2.5);opacity:0;border-width:0.5px}}@media (max-width:768px){.back-to-top-wrapper{width:30px;height:30px;bottom:16px;right:16px}.back-to-top-btn{border-radius:16px;font-size:16px}.ripple-container .ripple-wave{border-radius:16px}}@media (prefers-reduced-motion:reduce){.back-to-top-wrapper,.back-to-top-btn,.ripple-wave{animation:none!important;transition:none!important}}