:root{--background:#ffffff;--foreground:#171717}html{height:100%}body,html{max-width:100%;overflow-x:hidden}body{min-height:100%;display:flex;flex-direction:column;background:#ffffff;color:#171717;font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*,:after,:before{box-sizing:border-box;margin:0;padding:0}a{color:inherit;text-decoration:none}canvas,img,picture,svg,video{display:block;max-width:100%}button,input,select,textarea{font:inherit}.scrollToTopBtn{position:fixed;bottom:28px;right:28px;width:46px;height:46px;border-radius:50%;background:#2563eb;color:white;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 18px rgba(37,99,235,.45);z-index:999;opacity:0;visibility:hidden;transform:scale(.8) translateY(10px);transition:opacity .3s ease,transform .3s ease,visibility .3s ease,background .2s}.scrollToTopBtn.visible{opacity:1;visibility:visible;transform:scale(1) translateY(0)}.scrollToTopBtn:hover{background:#1d4ed8;transform:scale(1.1) translateY(-3px);box-shadow:0 6px 22px rgba(29,78,216,.55)}.scrollToTopBtn:active{transform:scale(.95)}@media (max-width:768px){.scrollToTopBtn{bottom:20px;right:20px;width:42px;height:42px}}