.intro{max-width:800px;margin:0 auto;text-align:center}.card-description{margin-bottom:20px;font-size:.95rem}.result-flash{animation:flash .5s}.trng-result.result-flash{animation:flash-green .5s}.error.visible{display:block;animation:shake .5s}.loading .spinner{opacity:1}.explanation{margin-top:40px;padding:30px;background:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow);line-height:1.8}.explanation h2{margin-bottom:20px;color:var(--dark-color);border-bottom:2px solid var(--light-color);padding-bottom:10px}.explanation p{margin-bottom:15px}@media (max-width:768px){.card-description{font-size:14px}}