/* SPA Router Styles */
#app-content {
    transition: opacity 0.15s ease-in-out, transform 0.15s ease-in-out;
}

#spa-progress {
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

/* Highlight animation for posts */
.highlight-post {
    animation: highlight 3s ease-in-out;
    border-color: rgba(16, 185, 129, 0.6) !important;
}

@keyframes highlight {
    0% { 
        background-color: rgba(16, 185, 129, 0.2);
        box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
    }
    100% { 
        background-color: transparent;
        box-shadow: none;
    }
}

/* Loading states */
.spa-loading {
    pointer-events: none;
}

.spa-loading * {
    cursor: wait !important;
}

/* Prefetch link styles */
a[data-prefetch="true"] {
    position: relative;
}

a[data-prefetch="true"]:hover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(16, 185, 129, 0.05);
    pointer-events: none;
}

/* SPA transition animations */
.spa-fade-enter {
    opacity: 0;
}

.spa-fade-enter-active {
    transition: opacity 0.15s ease-in-out;
}

.spa-fade-enter-to {
    opacity: 1;
}

.spa-slide-enter {
    transform: translateX(-10px);
    opacity: 0;
}

.spa-slide-enter-active {
    transition: all 0.15s ease-in-out;
}

.spa-slide-enter-to {
    transform: translateX(0);
    opacity: 1;
}

/* Preserve layout during transitions */
#app-content > * {
    min-height: 1px; /* Prevent layout collapse */
}

/* Focus management for accessibility */
.spa-skip-link {
    position: absolute;
    top: 0;
    left: 0;
    background: #10b981;
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    transform: translateY(-100%);
    transition: transform 0.2s;
    z-index: 10000;
}

.spa-skip-link:focus {
    transform: translateY(0);
}

/* Ensure critical UI elements remain accessible during navigation */
nav, header, #sidebar {
    position: relative;
    z-index: 100;
}

/* Enhanced loading spinner */
.spa-loading-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10001;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.spa-loading-spinner .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Error messages */
.spa-error-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #e74c3c;
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    z-index: 10002;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Body loading state */
body.spa-loading {
    cursor: wait;
}

body.spa-loading * {
    pointer-events: none;
}

/* Loading spinner for slower connections */
.spa-loading-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #10b981;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 9998;
    display: none;
}

.spa-loading .spa-loading-spinner {
    display: block;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Error states */
.spa-error {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #spa-progress {
        height: 2px;
    }
    
    .spa-loading-spinner {
        width: 30px;
        height: 30px;
        border-width: 2px;
    }
}