/* BTN Global Loading Spinner System
   Inline spinners that appear next to buttons during long operations
   Usage: Add .btn-loading class to any button during async operations */

.btn-loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: currentColor;
    animation: btn-spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
    flex-shrink: 0;
}

.btn-loading-spinner.spinner-before {
    margin-left: 0;
    margin-right: 8px;
}

.btn-loading-spinner.spinner-small {
    width: 12px;
    height: 12px;
    border-width: 1.5px;
}

.btn-loading-spinner.spinner-large {
    width: 20px;
    height: 20px;
    border-width: 2.5px;
}

.btn-loading-spinner.spinner-teal {
    border-color: rgba(61, 181, 163, 0.3);
    border-top-color: #3DB5A3;
}

@keyframes btn-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

button.btn-loading,
a.btn-loading,
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.85;
}

button.btn-loading:disabled,
a.btn-loading:disabled {
    cursor: not-allowed;
}

.loading-overlay {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 26, 0.6);
    backdrop-filter: blur(4px);
    border-radius: inherit;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.loading-overlay.is-active {
    display: flex;
}

.card-loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(61, 181, 163, 0.2);
    border-radius: 50%;
    border-top-color: #3DB5A3;
    animation: btn-spin 0.8s linear infinite;
}

.btn-text-loading {
    display: none;
}

.btn-loading .btn-text-loading {
    display: inline;
}

.btn-loading .btn-text-default {
    display: none;
}