:root{font-family:system-ui,-apple-system,sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh;background:#f5f5f5}.app{display:flex;align-items:center;justify-content:center;min-height:100vh}.counter-card{background:#fff;border-radius:16px;box-shadow:0 2px 16px #00000014;padding:64px 80px;text-align:center;min-width:320px}.counter-value{font-size:96px;font-weight:700;color:#1a1a1a;line-height:1;margin-bottom:48px}.counter-buttons{display:flex;gap:24px;justify-content:center}.btn{width:64px;height:64px;border-radius:50%;border:none;font-size:36px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .1s ease,box-shadow .1s ease;color:#fff;line-height:1}.btn:active{transform:scale(.95)}.btn-minus{background:#ef4444}.btn-minus:hover{background:#dc2626;box-shadow:0 4px 12px #ef444466}.btn-plus{background:#22c55e}.btn-plus:hover{background:#16a34a;box-shadow:0 4px 12px #22c55e66}