:root{--bg-color:#ffffff;--text-color:#111111;--button-bg:#111111;--button-text:#ffffff;--button-hover-bg:#2575fc;--card-bg:#ffffff}html[data-theme=dark]{--bg-color:#111111;--text-color:#ffffff;--button-bg:#ffffff;--button-text:#111111;--button-hover-bg:#2575fc;--card-bg:#1e1e1e}body,html{margin:0;padding:0;background:var(--bg-color);color:var(--text-color);font-family:Helvetica Neue,Helvetica,Arial,sans-serif;scroll-behavior:smooth}a{color:inherit;text-decoration:none}*{box-sizing:border-box}.fade-in-section{opacity:0;transform:translateY(30px);transition:opacity .8s ease-out,transform .8s ease-out}.fade-in-section.is-visible{opacity:1;transform:none}