:root{--at-hotline:#ff6a00;--at-zalo:#0068ff;--at-size:56px}.at-contact{position:fixed;bottom:20px;z-index:9998;display:flex;flex-direction:column;align-items:center;gap:14px;pointer-events:none}.at-contact--right{right:20px;left:auto}.at-contact--left{left:20px;right:auto}.at-contact__btn{position:relative;width:var(--at-size);height:var(--at-size);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;text-decoration:none;pointer-events:auto;box-shadow:0 6px 18px rgb(0 0 0 / .22);transition:transform 0.2s ease;-webkit-tap-highlight-color:#fff0}.at-contact__btn:hover,.at-contact__btn:focus-visible{transform:scale(1.08);color:#fff;outline:none}.at-contact__icon{position:relative;z-index:2;display:flex;line-height:0}.at-contact__icon--zalo{width:38px;height:38px;border-radius:50%;background:#fff;align-items:center;justify-content:center;overflow:hidden;box-shadow:0 1px 2px rgb(0 0 0 / .12)}.at-contact__icon--zalo img{width:28px;height:28px;object-fit:contain;display:block}.at-contact__btn--hotline{background:radial-gradient(circle at 30% 28%,#ff9a4d,var(--at-hotline) 50%,#e85d00);animation:at-shake 1.6s ease-in-out infinite}@keyframes at-shake{0%,100%{transform:rotate(0deg)}10%{transform:rotate(-12deg)}20%{transform:rotate(12deg)}30%{transform:rotate(-10deg)}40%{transform:rotate(10deg)}50%{transform:rotate(0deg)}50.1%,100%{transform:rotate(0deg)}}.at-contact__btn--zalo{background:radial-gradient(circle at 30% 28%,#4d94ff,var(--at-zalo) 52%,#0054d1);overflow:visible}.at-contact__wave{position:absolute;inset:0;border-radius:50%;border:2px solid var(--at-zalo);opacity:0;pointer-events:none;animation:at-pulse-wave 2.4s cubic-bezier(.15,.6,.3,1) infinite}.at-contact__wave--1{animation-delay:0s}.at-contact__wave--2{animation-delay:0.8s}.at-contact__wave--3{animation-delay:1.6s}@keyframes at-pulse-wave{0%{transform:scale(1);opacity:.7}100%{transform:scale(2.15);opacity:0}}@media (max-width:781px){:root{--at-size:52px}.at-contact{bottom:14px}.at-contact--right{right:14px}.at-contact--left{left:14px}}@media (prefers-reduced-motion:reduce){.at-contact__btn--hotline,.at-contact__wave{animation:none}}