/* Enhanced Loading States CSS */
/* Provides consistent loading animations and skeleton effects */

/* Base loading state container */
.loading-state {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    width: 100%;
    min-height: 120px;
    position: relative;
    border-radius: var(--border-radius-base, 8px);
    background: var(--bg-primary, #ffffff);
}

/* Overlay mode */
.loading-state.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(2px);
    z-index: 100;
    border-radius: inherit;
}

[data-theme="dark"] .loading-state.loading-overlay {
    background: rgba(31, 41, 55, 0.95);
}

/* Loading content wrapper */
.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
    max-width: 300px;
}

/* Loading message */
.loading-message {
    color: var(--text-secondary, #6b7280);
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0;
    line-height: 1.4;
}

/* Size variations */
.loading-state--small {
    padding: 1rem;
    min-height: 80px;
}

.loading-state--small .loading-message {
    font-size: 0.75rem;
}

.loading-state--large {
    padding: 3rem;
    min-height: 200px;
}

.loading-state--large .loading-message {
    font-size: 1rem;
}

/* ===================== */
/* SPINNER LOADING TYPE */
/* ===================== */
.loading-spinner {
    color: var(--color-primary, #3b82f6);
    font-size: 2rem;
}

.loading-spinner i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* =================== */
/* DOTS LOADING TYPE  */
/* =================== */
.loading-dots {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.loading-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary, #3b82f6);
    animation: dotPulse 1.4s ease-in-out infinite both;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

.loading-dot:nth-child(3) {
    animation-delay: -0.32s;
}

@keyframes dotPulse {
    0%, 80%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    40% {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===================== */
/* PROGRESS LOADING TYPE */
/* ===================== */
.loading-progress {
    width: 100%;
    max-width: 300px;
    height: 6px;
    background: var(--bg-secondary, #f3f4f6);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary, #3b82f6), var(--color-accent, #8b5cf6));
    border-radius: 3px;
    transition: width 0.3s ease;
    position: relative;
}

.loading-progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: progressShimmer 2s linear infinite;
}

@keyframes progressShimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Progress steps */
.loading-steps {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
    width: 100%;
    max-width: 300px;
}

.loading-step {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.loading-step.active {
    opacity: 1;
}

.loading-step.completed {
    opacity: 0.7;
}

.step-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-secondary, #e5e7eb);
    position: relative;
    flex-shrink: 0;
}

.loading-step.active .step-indicator {
    background: var(--color-primary, #3b82f6);
    animation: pulse 1.5s ease-in-out infinite;
}

.loading-step.completed .step-indicator {
    background: var(--color-success, #10b981);
}

.loading-step.completed .step-indicator::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 8px;
    font-weight: bold;
}

.step-label {
    font-size: 0.75rem;
    color: var(--text-secondary, #6b7280);
    line-height: 1.2;
}

.loading-step.active .step-label {
    color: var(--text-primary, #111827);
    font-weight: 500;
}

/* ====================== */
/* SKELETON LOADING TYPE  */
/* ====================== */
.loading-skeleton {
    width: 100%;
    padding: 0;
}

.loading-skeleton .loading-message {
    margin-bottom: 1.5rem;
    text-align: left;
    color: var(--text-primary, #111827);
    font-weight: 600;
}

.skeleton-container {
    display: grid;
    gap: 1rem;
    width: 100%;
}

/* Base skeleton element */
.skeleton-element {
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

@keyframes skeletonShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Dark theme skeleton */
[data-theme="dark"] .skeleton-element {
    background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
    background-size: 200% 100%;
}

/* Skeleton card layout */
.skeleton-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: var(--border-radius-base, 8px);
    background: var(--bg-primary, #ffffff);
}

.skeleton-image {
    width: 100%;
    height: 160px;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

.skeleton-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skeleton-title {
    height: 20px;
    width: 70%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

.skeleton-subtitle {
    height: 16px;
    width: 50%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

.skeleton-text {
    height: 14px;
    width: 85%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

/* Card grid layout */
.loading-skeleton[data-template="card-grid"] .skeleton-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

/* Skeleton list layout */
.skeleton-list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: var(--border-radius-base, 8px);
    background: var(--bg-primary, #ffffff);
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 2s ease-in-out infinite;
    flex-shrink: 0;
}

.loading-skeleton[data-template="list"] .skeleton-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Skeleton form layout */
.skeleton-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 400px;
    width: 100%;
}

.skeleton-input {
    height: 44px;
    width: 100%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

.skeleton-textarea {
    height: 120px;
    width: 100%;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-sm, 4px);
    animation: skeletonShimmer 2s ease-in-out infinite;
}

.skeleton-button {
    height: 44px;
    width: 120px;
    background: linear-gradient(90deg, var(--bg-secondary, #f3f4f6) 25%, var(--bg-elevated, #e5e7eb) 50%, var(--bg-secondary, #f3f4f6) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius-base, 8px);
    animation: skeletonShimmer 2s ease-in-out infinite;
    align-self: flex-start;
}

/* Generic skeleton item */
.skeleton-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: var(--border-radius-base, 8px);
    background: var(--bg-primary, #ffffff);
}

/* ================ */
/* RESPONSIVE DESIGN */
/* ================ */
@media (max-width: 768px) {
    .loading-state {
        padding: 1.5rem 1rem;
        min-height: 100px;
    }
    
    .loading-state--large {
        padding: 2rem 1rem;
        min-height: 150px;
    }
    
    .loading-content {
        max-width: none;
        width: 100%;
    }
    
    .loading-skeleton[data-template="card-grid"] .skeleton-container {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .skeleton-card {
        padding: 0.75rem;
    }
    
    .skeleton-image {
        height: 120px;
    }
    
    .loading-steps {
        max-width: none;
    }
    
    .loading-progress {
        max-width: none;
    }
}

/* ================ */
/* UTILITY CLASSES  */
/* ================ */

/* Pulse animation for active elements */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.loading-pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Fade in animation for loading states */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading-fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Loading state themes */
.loading-state--primary {
    background: var(--color-primary-alpha, rgba(59, 130, 246, 0.05));
    border: 1px solid var(--color-primary-20, rgba(59, 130, 246, 0.2));
}

.loading-state--success {
    background: var(--color-success-alpha, rgba(16, 185, 129, 0.05));
    border: 1px solid var(--color-success-20, rgba(16, 185, 129, 0.2));
}

.loading-state--warning {
    background: var(--color-warning-alpha, rgba(245, 158, 11, 0.05));
    border: 1px solid var(--color-warning-20, rgba(245, 158, 11, 0.2));
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .skeleton-element,
    .skeleton-image,
    .skeleton-title,
    .skeleton-subtitle,
    .skeleton-text,
    .skeleton-input,
    .skeleton-textarea,
    .skeleton-button,
    .skeleton-avatar {
        background: #d1d5db;
        animation: none;
    }
    
    .loading-dot {
        background: var(--color-primary, #3b82f6);
        animation: none;
        opacity: 1;
    }
    
    .loading-progress-bar::after {
        display: none;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner i,
    .loading-dot,
    .skeleton-element,
    .skeleton-image,
    .skeleton-title,
    .skeleton-subtitle,
    .skeleton-text,
    .skeleton-input,
    .skeleton-textarea,
    .skeleton-button,
    .skeleton-avatar,
    .loading-progress-bar::after,
    .step-indicator {
        animation: none;
    }
    
    .loading-state {
        transition: none;
    }
}