.customer-service {
    position: fixed;
    right: 24px;
    bottom: 24px;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    z-index: 999;
    font: 14px/1.6 "Microsoft YaHei", sans-serif;
    color: #333;
}
.customer-service *, .customer-service *::before, .customer-service *::after { box-sizing: border-box; }
.customer-service [hidden] { display: none !important; }
.customer-service button { font: inherit; cursor: pointer; }
.customer-service__trigger {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    width: 80px;
    padding: 13px 6px;
    border: 0;
    border-radius: 12px;
    background: #0098e8;
    color: #fff;
    box-shadow: 0 4px 18px rgba(0, 110, 180, .24);
}
.customer-service__trigger:hover { background: #0085cc; }
.customer-service button:focus-visible { outline: 3px solid #fa9504; outline-offset: 3px; }
.customer-service__panel {
    position: absolute;
    right: 0;
    bottom: 100%;
    width: 208px;
    max-width: calc(100vw - 32px);
    max-height: calc(100vh - 132px);
    overflow-y: auto;
    padding: 18px;
    border: 1px solid #e5edf2;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .14);
    text-align: center;
}
.customer-service__panel h2 { margin: 0 20px 8px; font-size: 16px; line-height: 1.5; color: #333; }
.customer-service__close {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 0;
    background: transparent;
    color: #666;
    font-size: 24px !important;
}
.customer-service__media { display: grid; place-items: center; min-height: 170px; }
.customer-service__qrcode { display: block; width: 100%; height: auto; object-fit: contain; }
.customer-service__media p { margin: 0; overflow-wrap: anywhere; }
.customer-service__hint { margin: 8px 0 0; font-size: 12px; color: #666; }
@media (max-width: 600px) {
    .customer-service { right: 16px; bottom: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); }
    .customer-service__trigger { width: 68px; padding: 10px 4px; font-size: 12px; }
}
@media print { .customer-service { display: none; } }