:root{color-scheme:light dark;--background:#f5f7fb;--foreground:#15202b;--surface:#ffffff;--border:rgba(20,45,90,0.12);--grid-line:rgba(33,150,243,0.08)}*{box-sizing:border-box}html{min-height:100%;background:var(--background)}body{min-height:100vh;margin:0;color:var(--foreground);background:radial-gradient(circle at top left,rgba(33,150,243,.18),transparent 28%),linear-gradient(180deg,#f7f9fc,#eef2f8);font-family:Segoe UI,Helvetica Neue,Helvetica,Arial,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}main{min-height:100vh}