#btb-event-assistant, #btb-event-assistant * { box-sizing: border-box; }
#btb-event-assistant { font-family: Arial, Helvetica, sans-serif; position: fixed; right: 22px; bottom: 22px; z-index: 2147483000; }
#btb-event-assistant button, #btb-event-assistant textarea { font: inherit; }
.btb-launch { border: 0; border-radius: 999px; padding: 15px 20px; background: #161616; color: #fff; box-shadow: 0 10px 30px rgba(0,0,0,.2); cursor: pointer; font-weight: 700; }
.btb-panel { width: min(390px, calc(100vw - 28px)); height: min(640px, calc(100vh - 40px)); background: #fff; border-radius: 18px; box-shadow: 0 22px 60px rgba(0,0,0,.22); overflow: hidden; border: 1px solid #e8e3dc; }
.btb-header { height: 72px; background: #161616; color: #fff; display:flex; align-items:center; justify-content:space-between; padding: 0 18px; }
.btb-header strong { display:block; font-size: 17px; }
.btb-header span { display:block; font-size: 12px; opacity:.75; margin-top:2px; }
.btb-close { background: transparent; color:#fff; border:0; font-size:28px; cursor:pointer; padding:4px 8px; }
.btb-messages { height: calc(100% - 72px - 118px - 53px); overflow-y:auto; padding:16px; background:#faf9f7; }
.btb-msg { max-width: 84%; margin: 0 0 12px; padding: 11px 13px; border-radius: 14px; line-height: 1.4; white-space: pre-wrap; font-size: 14px; }
.btb-msg.assistant { background:#fff; border:1px solid #e8e3dc; color:#222; }
.btb-msg.user { margin-left:auto; background:#161616; color:#fff; }
.btb-msg.thinking { opacity:.65; }
.btb-chips { padding: 10px 14px 2px; display:flex; gap:7px; flex-wrap:wrap; background:#faf9f7; }
.btb-chips button { background:#fff; border:1px solid #d8d0c6; border-radius:999px; padding:7px 10px; cursor:pointer; font-size:12px; }
.btb-form { display:flex; gap:8px; padding: 10px 12px; border-top:1px solid #e8e3dc; background:#fff; }
.btb-form textarea { flex:1; resize:none; border:1px solid #d8d0c6; border-radius:10px; padding:10px; outline:none; min-height:44px; }
.btb-form button { border:0; border-radius:10px; padding:0 15px; background:#161616; color:#fff; font-weight:700; cursor:pointer; }
.btb-form button:disabled { opacity:.55; cursor:default; }
.btb-disclaimer { height:53px; padding:8px 13px; border-top:1px solid #eee9e3; background:#fff; color:#777; font-size:10.5px; line-height:1.35; }
@media (max-width: 520px) { #btb-event-assistant { right:14px; bottom:14px; } .btb-panel { height: min(680px, calc(100vh - 28px)); } }