*{box-sizing:border-box}body{font-family:Space Grotesk,Helvetica Neue,sans-serif;background:#f7f7fa;color:#1a1a2e}input,button{font-family:inherit}.portal-input{width:100%;padding:12px 14px;border-radius:10px;border:1.5px solid #E5E5EA;font-size:14px;outline:none;background:#fff}.portal-input:focus{border-color:#6366f1}.portal-btn{width:100%;padding:12px 14px;border-radius:10px;border:none;background:#6366f1;color:#fff;font-weight:700;font-size:14px;cursor:pointer}.portal-btn:disabled{opacity:.5;cursor:not-allowed}.portal-btn.ghost{background:transparent;color:#6366f1;border:1.5px solid #6366F1}.chat-shell{width:100%;max-width:640px;margin:0 auto;height:100vh;display:flex;flex-direction:column;background:#fff}@media (min-width: 700px){.chat-shell{height:calc(100vh - 48px);margin-top:24px;margin-bottom:24px;border-radius:16px;border:1px solid #E5E5EA;box-shadow:0 4px 24px #0f17290f;overflow:hidden}}