body{background-color:#f8fafc;color:#1e293b;overflow-x:hidden}.glass-card{background:rgba(255,255,255,.7);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.3)}.envelope-float{animation:float-envelope 6s ease-in-out infinite}@keyframes float-envelope{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-15px) rotate(2deg)}}details>summary{list-style:none}details>summary::-webkit-details-marker{display:none}details[open] summary~*{animation:sweep .5s ease-in-out}@keyframes sweep{0%{opacity:0;transform:translateY(-10px)}100%{opacity:1;transform:translateY(0)}}details>summary i{transition:transform .3s ease}details[open]>summary i{transform:rotate(180deg)}