:root{--bg-color:#f0f4f8;--primary:#3b82f6;--primary-hover:#2563eb;--card-bg:#ffffff;--text-main:#334155;--text-muted:#64748b;--border-radius-lg:24px;--border-radius-md:16px;--btn-padding:14px 20px}*{margin:0;padding:0;box-sizing:border-box;font-family:'Nunito','Quicksand','Comic Sans MS',sans-serif;-webkit-tap-highlight-color:#fff0}body{background:var(--bg-color);overflow:hidden;color:var(--text-main)}.screen{position:absolute;top:0;left:0;width:100vw;height:100vh;transition:opacity 0.4s ease,transform 0.4s ease}.screen.hidden{opacity:0;pointer-events:none;transform:scale(.98);z-index:-1}.screen.active{opacity:1;pointer-events:auto;transform:scale(1);z-index:10}