/* ==========================================================================
   LOADING ANIMATION - Lightweight CSS for immediate loading display
   ========================================================================== */

/* CSS Variables for loading (minimal set) */
:root {
    --loading-bg: #ffffff;
    --loading-text: #4a5568;
    --loading-border: #e2e8f0;
    --loading-accent: #4299e1;
}

@media (prefers-color-scheme: dark) {
    :root {
        --loading-bg: #1a202c;
        --loading-text: #a0aec0;
        --loading-border: #4a5568;
        --loading-accent: #63b3ed;
    }
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--loading-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Loading spinner */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--loading-border);
    border-top: 3px solid var(--loading-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

/* Loading text */
.loading-text {
    color: var(--loading-text);
    font-size: 0.9em;
    font-weight: 500;
    letter-spacing: 0.5px;
    animation: pulse 2s ease-in-out infinite;
}

/* Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Hide content while loading */
body.loading .main-header,
body.loading main,
body.loading .page-wrapper,
body.loading .main-footer {
    visibility: hidden;
}