/* ==========================================================================
   SPA SPECIFIC STYLES
   ========================================================================== */

/* Loading indicator */
.loading-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    flex-direction: column;
    align-items: center;
    z-index: 1000;
    background: rgba(245, 247, 250, 0.98);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Content container transitions */
#content-container {
    transition: opacity 0.3s ease;
    min-height: calc(100vh - 200px);
}

/* Error container */
.error-container {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-primary);
    max-width: 600px;
    margin: 0 auto;
    background: var(--content-background);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.error-container h2 {
    color: #e74c3c;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-xl);
}

.error-container p {
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* Navigation button styles (for nav-links that are now buttons) */
.nav-link {
    background: none;
    border: none;
    font-family: inherit;
    cursor: pointer;
    font-size: inherit;
}

.nav-link:focus {
    outline: 2px solid var(--primary-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* CTA buttons in SPA context */
button.cta-link {
    border: none;
    font-family: inherit;
    cursor: pointer;
}

button.cta-link:focus {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 2px;
}

/* Skip to main content link for accessibility */
.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;
}

.sr-only:focus {
    position: fixed;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: auto;
    height: auto;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background: var(--primary-accent);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 1001;
    font-size: var(--font-size-base);
}

/* Footer styling for SPA */
#app-footer {
    background: var(--content-background);
    border-top: 1px solid rgba(149, 165, 166, 0.1);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Mobile responsive adjustments for SPA elements */
@media (max-width: 768px) {
    .loading-indicator {
        padding: var(--spacing-lg);
        max-width: 90vw;
    }
    
    .spinner {
        width: 30px;
        height: 30px;
        border-width: 3px;
    }
    
    .error-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-md);
    }
    
    .error-container h2 {
        font-size: var(--font-size-lg);
    }
    
    .error-container p {
        font-size: var(--font-size-base);
    }
}

/* Ensure smooth scrolling for SPA navigation */
html {
    scroll-behavior: smooth;
}

/* Handle focus states for keyboard navigation */
*:focus {
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: more) {
    .loading-indicator {
        background: white;
        border: 2px solid black;
    }
    
    .spinner {
        border-color: black;
        border-top-color: var(--primary-accent);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .spinner {
        animation: none;
        border: 4px solid var(--primary-accent);
    }
    
    #content-container {
        transition: none;
    }
    
    html {
        scroll-behavior: auto;
    }
}