/* ═══════════ 通用动画 keyframes ═══════════ */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes popIn{from{opacity:0;transform:scale(.85) translateY(20px)}to{opacity:1;transform:scale(1) translateY(0)}}
@keyframes payPulse{0%,100%{box-shadow:0 3px 14px rgba(234,88,12,.3)}50%{box-shadow:0 6px 24px rgba(234,88,12,.45);transform:scale(1.04)}}
@keyframes sendBreathe{0%,100%{box-shadow:0 3px 14px rgba(234,88,12,.25)}50%{box-shadow:0 3px 24px rgba(234,88,12,.5),0 0 0 4px rgba(234,88,12,.08)}}