/* Enhanced Loading Animations for Dashboard */

/* Loading Container */
.loading-container {
    padding: 2rem;
    min-height: 400px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Skeleton Dashboard Layout */
.skeleton-dashboard {
    margin-top: 2rem;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Food Selection Loading State */
.food-selection-loading {
    position: relative;
    overflow: hidden;
}

.food-selection-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(248, 138, 18, 0.1) 50%, 
        transparent 100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Meal Card Loading Animation */
.meal-card-loading {
    background: linear-gradient(90deg, #f8f9fa 25%, #e9ecef 50%, #f8f9fa 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 0.5rem;
    height: 120px;
    margin-bottom: 1rem;
}

/* Progress Bar Smooth Transitions */
.progress-bar {
    transition: width 0.6s ease-out;
}

/* Loading Step Text Animation */
.loading-step {
    animation: fadeInOut 1.5s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

/* Staggered Loading Animation for List Items */
.loading-item {
    opacity: 0;
    animation: fadeInUp 0.4s ease-out forwards;
}

.loading-item:nth-child(1) { animation-delay: 0.1s; }
.loading-item:nth-child(2) { animation-delay: 0.2s; }
.loading-item:nth-child(3) { animation-delay: 0.3s; }
.loading-item:nth-child(4) { animation-delay: 0.4s; }
.loading-item:nth-child(5) { animation-delay: 0.5s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Spinner Variations */
.spinner-dots {
    display: inline-flex;
    gap: 0.3rem;
}

.spinner-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--bs-primary);
    animation: dotPulse 1.4s infinite ease-in-out both;
}

.spinner-dots span:nth-child(1) { animation-delay: -0.32s; }
.spinner-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes dotPulse {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Success Animation */
.loading-success {
    animation: successPulse 0.5s ease-out;
}

@keyframes successPulse {
    0% {
        transform: scale(0.9);
        opacity: 0;
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Error Animation */
.loading-error {
    animation: errorShake 0.5s ease-out;
}

@keyframes errorShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

/* Optimized Performance with GPU Acceleration */
.loading-spinner,
.skeleton-card,
.skeleton-list-item,
.progress-bar {
    will-change: transform, opacity;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .skeleton-card,
    .skeleton-list-item {
        background: #2d2d2d;
    }
    
    .skeleton-line,
    .skeleton-avatar {
        background: linear-gradient(90deg, #3d3d3d 25%, #4d4d4d 50%, #3d3d3d 75%);
    }
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .loading-container {
        padding: 1rem;
    }
    
    .skeleton-card {
        height: 100px;
    }
    
    @keyframes fadeInUp {
        from {
            transform: translateY(5px);
        }
    }
}