.scroll-to-top{position:fixed;bottom:28px;left:28px;z-index:999;width:56px;height:56px;border:none;background:0 0;cursor:pointer;opacity:0;visibility:hidden;transform:scale(.6) translateY(24px);transition:opacity .5s cubic-bezier(.34, 1.56, .64, 1),visibility .5s,transform .55s cubic-bezier(.34, 1.56, .64, 1);pointer-events:none}.scroll-to-top.visible{opacity:1;visibility:visible;transform:scale(1) translateY(0);pointer-events:auto;animation:.7s cubic-bezier(.34,1.56,.64,1) forwards scrollTopReveal}@keyframes scrollTopReveal{0%{transform:scale(.85) translateY(12px);opacity:.7}100%{transform:scale(1) translateY(0);opacity:1}}.scroll-to-top-inner{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center}.scroll-to-top-btn{position:relative;width:56px;height:56px;transform-origin:center;border-radius:18px;background:rgba(15,23,42,.8);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);border:1px solid rgba(59,130,246,.25);display:flex;align-items:center;justify-content:center;box-shadow:0 10px 40px rgba(0,0,0,.35),0 0 0 1px rgba(255,255,255,.04) inset;transition:.45s cubic-bezier(.34, 1.56, .64, 1);overflow:hidden}.scroll-to-top-btn::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(59,130,246,.12) 0,transparent 40%,rgba(6,182,212,.08) 100%);border-radius:18px;opacity:0;transition:opacity .4s}.scroll-to-top-btn::after{content:'';position:absolute;inset:-2px;border-radius:20px;padding:2px;background:linear-gradient(135deg,rgba(59,130,246,.6),rgba(6,182,212,.4),rgba(99,102,241,.3),rgba(59,130,246,.5));background-size:300% 300%;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .4s;animation:4s infinite scrollBorderFlow}@keyframes scrollBorderFlow{0%,100%{background-position:0 50%}50%{background-position:100% 50%}}.scroll-to-top:hover .scroll-to-top-btn{transform:scale(1.08);background:rgba(15,23,42,.95);border-color:rgba(59,130,246,.5);box-shadow:0 16px 48px rgba(0,0,0,.45),0 0 48px rgba(59,130,246,.2),0 0 0 1px rgba(255,255,255,.06) inset}.scroll-to-top:hover .scroll-to-top-btn::after,.scroll-to-top:hover .scroll-to-top-btn::before{opacity:1}.scroll-to-top:active .scroll-to-top-btn{transform:scale(.95)}.scroll-to-top-arrow{width:20px;height:20px;position:relative;z-index:1;transition:.4s cubic-bezier(.34, 1.56, .64, 1)}.scroll-to-top-arrow::after,.scroll-to-top-arrow::before{content:'';position:absolute;left:50%;width:10px;height:2.5px;background:linear-gradient(90deg,#93c5fd,#60a5fa);border-radius:2px;transform-origin:left center;box-shadow:0 0 8px rgba(147,197,253,.6);transition:.35s}.scroll-to-top-arrow::before{top:4px;transform:translateX(-50%) rotate(-45deg)}.scroll-to-top-arrow::after{bottom:4px;transform:translateX(-50%) rotate(45deg)}.scroll-to-top:hover .scroll-to-top-arrow{transform:translateY(-4px)}.scroll-to-top:hover .scroll-to-top-arrow::after,.scroll-to-top:hover .scroll-to-top-arrow::before{background:linear-gradient(90deg,#60a5fa,#38bdf8);box-shadow:0 0 12px rgba(96,165,250,.8)}.scroll-to-top.visible .scroll-to-top-btn{animation:3s ease-in-out infinite scrollBtnGlow}.scroll-to-top.visible .scroll-to-top-arrow{animation:2.5s ease-in-out infinite scrollArrowFloat}@keyframes scrollBtnGlow{0%,100%{box-shadow:0 10px 40px rgba(0,0,0,.35),0 0 0 1px rgba(255,255,255,.04) inset}50%{box-shadow:0 12px 48px rgba(0,0,0,.4),0 0 28px rgba(59,130,246,.12),0 0 0 1px rgba(255,255,255,.06) inset}}@keyframes scrollArrowFloat{0%,100%{transform:translateY(0);opacity:1}50%{transform:translateY(-3px);opacity:.9}}@media (max-width:768px){.scroll-to-top{bottom:24px;left:24px;width:52px;height:52px}.scroll-to-top-btn{width:52px;height:52px;border-radius:16px}.scroll-to-top-btn::after{border-radius:18px}}