/* VietTik — bong bóng trợ lý (chat AI / tra cứu nhanh) */
.vt-primary{background:var(--dx-primary,#7d6ff2)!important;color:#fff!important;border-color:transparent!important}
/* bong bóng */
.vt-fab{position:fixed;right:22px;bottom:22px;width:54px;height:54px;border-radius:50%;border:0;background:linear-gradient(135deg,#7d6ff2,#3fc1a5);color:#fff;box-shadow:0 8px 24px rgba(60,50,150,.3);cursor:pointer;display:grid;place-items:center;z-index:60;transition:transform .15s}
.vt-fab:hover{transform:scale(1.06)}
.vt-fab svg{width:26px;height:26px}
.vt-fab.on{background:var(--dx-text,#222)}
.vt-panel{position:fixed;right:22px;bottom:88px;width:min(400px,calc(100vw - 32px));max-height:min(620px,calc(100vh - 120px));display:none;flex-direction:column;background:var(--dx-card,#fff);border:1px solid var(--dx-border);border-radius:16px;box-shadow:0 18px 50px rgba(20,20,60,.25);z-index:60;overflow:hidden}
.vt-panel.open{display:flex}
.vt-ph{display:flex;gap:10px;align-items:center;padding:12px 14px;border-bottom:1px solid var(--dx-border);background:var(--dx-soft-2,#f6f5ff)}
.vt-ph b{display:block;font-size:14px}
.vt-ph span{display:block;color:var(--dx-muted);font-size:11.5px;line-height:1.3}
.vt-ph div{flex:1;min-width:0}
.vt-x{border:0;background:transparent;font-size:22px;line-height:1;cursor:pointer;color:var(--dx-muted);padding:0 4px}
.vt-msgs{flex:1;overflow:auto;padding:12px 14px;display:flex;flex-direction:column;gap:8px;min-height:160px}
.vt-msg{max-width:92%;padding:9px 12px;border-radius:12px;font-size:13px;line-height:1.5;word-break:break-word}
.vt-msg.bot{background:var(--dx-soft-2,#f3f2fb);align-self:flex-start;border-bottom-left-radius:4px}
.vt-msg.me{background:var(--dx-primary,#7d6ff2);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.vt-msg a{color:var(--dx-primary,#7d6ff2);font-weight:600;text-decoration:none}
.vt-msg a:hover{text-decoration:underline}
.vt-msg b{display:inline-block;margin-right:4px}
.vt-sug{display:flex;gap:6px;flex-wrap:wrap;padding:6px 12px 2px;border-top:1px solid var(--dx-border)}
.vt-sug .lx-cat{font-size:12px;padding:4px 10px}
.vt-form{display:flex;gap:8px;padding:10px 12px 12px}
.vt-form input{flex:1;min-width:0;border:1px solid var(--dx-border);border-radius:10px;padding:9px 11px;font:inherit;font-size:13px;background:var(--dx-card,#fff);color:var(--dx-text)}
@media (max-width:760px){.vt-fab{right:14px;bottom:14px;width:48px;height:48px}.vt-panel{right:8px;left:8px;width:auto;bottom:70px}}
.vt-form button{padding:0 14px;height:38px;border-radius:10px;border:1px solid var(--dx-border);background:var(--dx-card,#fff);color:var(--dx-text);font:inherit;font-size:13.5px;font-weight:600;cursor:pointer}

.vt-msg.ai{white-space:normal}.vt-msg.ai ul{margin:4px 0 4px 18px}.vt-msg.ai li{margin:2px 0}.vt-msg.ai b{display:inline;margin:0}
.vt-left{font-size:11px;color:var(--dx-muted);padding:0 14px 8px}
.vt-form textarea{flex:1;min-width:0;border:1px solid var(--dx-border);border-radius:10px;padding:9px 11px;font:inherit;font-size:13px;background:var(--dx-card,#fff);color:var(--dx-text);resize:none;height:40px;max-height:120px}