*{box-sizing:border-box}body{color:#16181d;background:#f6f7fb;margin:0;font-family:Inter,system-ui}header{color:#fff;background:#111827;justify-content:space-between;padding:22px 7%;display:flex}header b{font-size:24px}main{max-width:1100px;margin:55px auto;padding:0 20px}h1{margin-bottom:8px;font-size:48px}.grid{grid-template-columns:repeat(3,1fr);gap:18px;margin:35px 0;display:grid}.grid article,.chat{background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:24px;box-shadow:0 10px 30px #0000000b}button{color:#fff;cursor:pointer;background:#111827;border:0;border-radius:10px;padding:12px 18px}.chat{margin-top:30px}.answer{white-space:pre-wrap;background:#f9fafb;border-radius:12px;min-height:90px;padding:18px}.row{gap:10px;margin-top:14px;display:flex}input{border:1px solid #d1d5db;border-radius:10px;flex:1;padding:14px}@media (width<=750px){.grid{grid-template-columns:1fr}h1{font-size:36px}}