/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(250, 250, 250, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.hidden {
    display: none;
}

/* Spinner */
.spinner-border {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: text-bottom;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border .75s linear infinite;
}

.spinner-border.text-primary {
    color: #4e73df;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@keyframes spinner-border {
    to { transform: rotate(360deg); }
}

/* Hidden state for overlay */
.loading-overlay.hidden {
    display: none;
}

/* Smooth transitions */
.loading-overlay.fade-out {
    opacity: 0;
}

/* Main content styling */
#main-content {
    max-width: 800px;
    padding: 20px;
    text-align: center;
}