.twcb-chatbox{position:fixed;bottom:max(20px,env(safe-area-inset-bottom));z-index:999;font-family:Arial,sans-serif;color:#fff;max-width:calc(100vw - 32px)}.twcb-left{left:16px}.twcb-right{right:16px}.twcb-chatbox summary{display:flex;align-items:center;gap:8px;list-style:none;padding:12px 16px;min-height:48px;border-radius:28px;background:#111;color:#fff;cursor:pointer;box-shadow:0 2px 10px #0003;font-size:14px;white-space:nowrap}.twcb-chatbox summary::-webkit-details-marker{display:none}.twcb-chatbox summary img{display:block;width:24px;height:24px}.twcb-panel{position:absolute;bottom:calc(100% + 10px);right:0;display:flex;flex-direction:column;gap:5px;width:230px;max-width:calc(100vw - 32px);padding:14px;background:#111;border:1px solid #444;border-radius:14px;box-shadow:0 4px 20px #0004}.twcb-left .twcb-panel{left:0;right:auto}.twcb-panel strong{font-size:13px;padding:0 8px 6px}.twcb-chatbox .twcb-button{display:flex;align-items:center;gap:10px;padding:8px;min-height:44px;border-radius:6px;color:#fff;text-decoration:none;white-space:nowrap;word-break:normal;overflow-wrap:normal;font-size:14px}.twcb-chatbox .twcb-button img{flex:0 0 28px;width:28px;height:28px;max-width:none}.twcb-chatbox .twcb-button span{white-space:nowrap;word-break:normal;overflow-wrap:normal}.twcb-chatbox .twcb-button:hover{background:#333}.twcb-chatbox summary:focus-visible,.twcb-chatbox a:focus-visible{outline:2px solid #76bbef;outline-offset:2px}@media print{.twcb-chatbox{display:none}}
/* Phone + Zalo badge, with soft expanding rings matching the requested button. */
.twcb-chatbox summary{position:relative;isolation:isolate;width:60px;height:60px;min-height:60px;padding:0;border:0;border-radius:50%;background:transparent;box-shadow:none;justify-content:center}
.twcb-chatbox summary img{position:relative;z-index:1;width:56px;height:56px;filter:drop-shadow(0 2px 3px #0003)}
.twcb-chatbox summary::before,.twcb-chatbox summary::after{content:"";position:absolute;inset:5px;border-radius:50%;background:linear-gradient(135deg,#d4f565,#1879ef);pointer-events:none;animation:twcb-ripple 2.4s ease-out infinite}
.twcb-chatbox summary::after{animation-delay:1.2s}
.twcb-chatbox[open] summary::before,.twcb-chatbox[open] summary::after{animation-play-state:paused;opacity:0}
@keyframes twcb-ripple{0%{transform:scale(.8);opacity:.4}100%{transform:scale(1.65);opacity:0}}
@media(prefers-reduced-motion:reduce){.twcb-chatbox summary::before,.twcb-chatbox summary::after{animation:none;opacity:0}}
.twcb-chatbox[open] summary::before,.twcb-chatbox[open] summary::after{animation:none;opacity:0}