.vrv-btn{position:fixed;right:20px;bottom:20px;z-index:9999;padding:12px 14px;border-radius:999px;border:0;cursor:pointer;background:#111;color:#fff;font-weight:600}
.vrv-panel{position:fixed;right:20px;bottom:80px;width:360px;max-width:90vw;height:520px;background:#fff;border-radius:16px;box-shadow:0 20px 40px rgba(0,0,0,.2);z-index:9999;display:flex;flex-direction:column}
.vrv-hidden{display:none}
.vrv-head{padding:12px;background:#f6f7f9;font-weight:600;display:flex;justify-content:space-between}
.vrv-close{cursor:pointer}
.vrv-body{flex:1;overflow:auto;padding:10px;background:#fafbfc}
.vrv-messages{display:flex;flex-direction:column;gap:10px}
.vrv-msg{padding:10px;border-radius:12px;max-width:85%}
.vrv-user{align-self:flex-end;background:#e6f0ff}
.vrv-bot{align-self:flex-start;background:#eef1f3}
.vrv-form{display:flex;gap:8px;padding:10px;border-top:1px solid #eee;background:#fff}
.vrv-input{flex:1;padding:10px;border:1px solid #ddd;border-radius:10px}
.vrv-send{padding:10px 14px;border:0;border-radius:10px;cursor:pointer;background:#111;color:#fff}