/* 28/10/2026 khung chat tro ly ho tro (bk_hotro) - mau Ba Khi theo portal.css */
.bkht-nut{position:fixed;right:20px;bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:9990;width:58px;height:58px;border-radius:50%;
  border:2px solid #c99a46;background:radial-gradient(circle at 35% 30%,#b3201a,#7a1a10 70%);color:#ffd77a;font-size:24px;
  box-shadow:0 4px 14px rgba(0,0,0,.45);cursor:pointer;display:flex;align-items:center;justify-content:center}
.bkht-nut:hover{transform:translateY(-2px)}
.bkht-nut .bkht-cham{position:absolute;top:2px;right:2px;width:12px;height:12px;border-radius:50%;background:#ffd77a;border:2px solid #7a1a10}
.bkht-khung{position:fixed;right:20px;bottom:calc(90px + env(safe-area-inset-bottom,0px));z-index:9991;width:360px;max-width:calc(100vw - 32px);
  height:520px;max-height:calc(100vh - 120px);display:flex;flex-direction:column;background:#1d1410;border:1px solid #c99a46;
  border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.55);overflow:hidden;font-size:14px;color:#f3e3bf}
.bkht-khung[hidden]{display:none!important}
.bkht-dau{background:linear-gradient(180deg,#7a1a10,#4a0f09);border-bottom:2px solid #c99a46;padding:10px 14px;display:flex;align-items:center;gap:10px}
.bkht-dau b{font-family:"Noto Serif","Times New Roman",Georgia,serif;color:#ffd77a;font-size:16px;flex:1}
.bkht-dau small{display:block;color:#f3e3bf;opacity:.75;font-weight:normal;font-size:12px}
.bkht-dong{background:none;border:0;color:#ffd77a;font-size:22px;line-height:1;cursor:pointer;padding:0 4px}
.bkht-tin{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;background:#2a1d16}
.bkht-m{max-width:85%;padding:8px 11px;border-radius:10px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}
.bkht-bot{align-self:flex-start;background:#f3e3bf;color:#3a2a20;border-bottom-left-radius:3px}
.bkht-toi{align-self:flex-end;background:#7a1a10;color:#ffd77a;border:1px solid #c99a46;border-bottom-right-radius:3px}
.bkht-bot a{color:#7a1a10;font-weight:bold;text-decoration:underline}
.bkht-goi{display:flex;flex-wrap:wrap;gap:6px;align-self:flex-start;max-width:100%}
.bkht-goi button{background:transparent;border:1px solid #c99a46;color:#ffd77a;border-radius:14px;padding:4px 10px;font-size:13px;cursor:pointer}
.bkht-goi button:hover{background:#5a3d22}
.bkht-go{display:flex;gap:6px;padding:8px;border-top:1px solid #5a3d22;background:#1d1410}
.bkht-go input{flex:1;min-width:0;background:#f3e3bf;color:#3a2a20;border:1px solid #c99a46;border-radius:8px;padding:8px 10px;font-size:14px}
.bkht-go button{background:#b3201a;color:#ffd77a;border:1px solid #c99a46;border-radius:8px;padding:0 14px;font-weight:bold;cursor:pointer}
.bkht-cho{align-self:flex-start;color:#c99a46;font-style:italic;font-size:13px}
@media (max-width:480px){.bkht-khung{right:0;left:0;bottom:0;width:100%;max-width:100%;height:75vh;border-radius:12px 12px 0 0}
  .bkht-nut{right:14px;bottom:calc(14px + env(safe-area-inset-bottom,0px))}}