/* Button Loader - Prevent double submit */
.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: btn-spin 0.6s linear infinite;
    vertical-align: middle;
}
.btn-spinner.dark {
    border-color: rgba(0,0,0,0.2);
    border-top-color: #000;
}
@keyframes btn-spin {
    to { transform: rotate(360deg); }
}
button[disabled], .btn-cta[disabled], .btn-save[disabled], .btn-outline[disabled],
input[type="submit"][disabled] {
    opacity: 0.7 !important;
    cursor: not-allowed !important;
    pointer-events: none;
}