/* ===== Toast 提示 ===== */
.toast-container {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    pointer-events: none;
}
.toast {
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 8px;
    animation: toastIn 0.3s ease-out, toastOut 0.3s ease-in 2.7s forwards;
    text-align: center;
    max-width: 90vw;
}
.toast.success { background: rgba(40, 167, 69, 0.9); }
.toast.error   { background: rgba(220, 53, 69, 0.9); }
.toast.info    { background: rgba(102, 126, 234, 0.9); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(-20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes toastOut {
    from { opacity: 1; }
    to   { opacity: 0; }
}