:root{--background:#ffffff;--foreground:#171717}@media (prefers-color-scheme:dark){:root{--background:#0a0a0a;--foreground:#ededed}}body{background:var(--background);color:var(--foreground);font-family:Arial,Helvetica,sans-serif}.feature-card{transition:transform .3s ease,box-shadow .3s ease}.feature-card:hover{transform:translateY(-8px);box-shadow:0 12px 24px rgba(0,0,0,.15)}button{transition:background-color .2s ease,transform .1s ease,box-shadow .2s ease}button:hover:not(:disabled){filter:brightness(.9)}a>button:hover:not(:disabled),button[onClick]:hover:not(:disabled),button[type=submit]:hover:not(:disabled){background-color:#004080}button{transition:transform .2s ease,box-shadow .2s ease}button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.15)}.buttonBuy:disabled{background:#ccc;color:#777}