/**
 * Loading States CSS
 * 
 * Styles for loading states and spinners across the application
 */

/* Loading Spinner */
.spinner-border {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    vertical-align: text-bottom;
    border: 0.125em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

.spinner-border-sm {
    width: 0.875rem;
    height: 0.875rem;
    border-width: 0.125em;
}

.spinner-border-lg {
    width: 1.5rem;
    height: 1.5rem;
    border-width: 0.2em;
}

@keyframes spinner-border {
    to {
        transform: rotate(360deg);
    }
}

/* Button Loading States */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
    cursor: not-allowed !important;
}

.btn-loading:hover {
    opacity: 0.8;
}

.btn-loading .loading-spinner {
    margin-right: 8px;
}

/* Form Loading States */
.form-loading {
    opacity: 0.6;
    pointer-events: none;
    background-color: #f8f9fa !important;
}

.form-loading:focus {
    box-shadow: none !important;
    border-color: #ced4da !important;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    border-radius: inherit;
}

.loading-overlay .spinner-border {
    width: 2rem;
    height: 2rem;
    border-width: 0.2em;
    color: #007bff;
}

/* Card Loading State */
.card-loading {
    position: relative;
    overflow: hidden;
}

.card-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    animation: loading-shimmer 1.5s infinite;
    z-index: 1;
}

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

/* Table Loading State */
.table-loading {
    position: relative;
}

.table-loading tbody {
    opacity: 0.5;
}

.table-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

/* Loading Text Animation */
.loading-text::after {
    content: '';
    animation: loading-dots 1.5s infinite;
}

@keyframes loading-dots {
    0%, 20% {
        content: '';
    }
    40% {
        content: '.';
    }
    60% {
        content: '..';
    }
    80%, 100% {
        content: '...';
    }
}

/* Pulse Animation for Loading Elements */
.loading-pulse {
    animation: loading-pulse 1.5s ease-in-out infinite;
}

@keyframes loading-pulse {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

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

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: 4px;
}

.skeleton-text:last-child {
    margin-bottom: 0;
    width: 80%;
}

/* Loading States for Specific Components */

/* Transaction Cards */
.transaction-card.loading {
    pointer-events: none;
}

.transaction-card.loading .card-body {
    opacity: 0.6;
}

/* Action Buttons */
.action-btn.loading {
    min-width: 120px; /* Prevent button size changes */
}

.action-btn.loading .btn-text {
    display: none;
}

.action-btn.loading .loading-spinner {
    display: inline-block;
}

/* File Upload Loading */
.file-upload-loading {
    position: relative;
}

.file-upload-loading::after {
    content: 'Uploading...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 123, 255, 0.9);
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 14px;
    z-index: 100;
}

/* State Change Loading */
.state-change-loading {
    position: relative;
    opacity: 0.7;
}

.state-change-loading select,
.state-change-loading button {
    pointer-events: none;
}

/* Email Configuration Loading */
.email-config-loading {
    background: #f8f9fa;
    border: 1px dashed #dee2e6;
    padding: 20px;
    text-align: center;
    border-radius: 4px;
}

.email-config-loading::before {
    content: '📧';
    font-size: 2em;
    display: block;
    margin-bottom: 10px;
}

.email-config-loading::after {
    content: 'Loading email configuration...';
    color: #6c757d;
    font-style: italic;
}

/* Responsive Loading States */
@media (max-width: 768px) {
    .btn-loading {
        min-width: 100px;
        font-size: 0.875rem;
    }
    
    .loading-overlay .spinner-border {
        width: 1.5rem;
        height: 1.5rem;
    }
    
    .action-btn.loading {
        min-width: 100px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .loading-overlay {
        background-color: rgba(0, 0, 0, 0.8);
    }
    
    .form-loading {
        background-color: #343a40 !important;
    }
    
    .skeleton {
        background: linear-gradient(90deg, #343a40 25%, #495057 50%, #343a40 75%);
        background-size: 200% 100%;
    }
}

/* Accessibility */
.loading-spinner[aria-hidden="true"] {
    speak: none;
}

.btn-loading:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .loading-spinner,
    .loading-overlay,
    .btn-loading {
        display: none !important;
    }
}