/* Loading System Styles
   Global loading indicators, spinners, and progress states */

/* Global Page Loader */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.page-loader.show {
    opacity: 1;
    visibility: visible;
}

.page-loader.theme-light {
    background: rgba(255, 255, 255, 0.9);
}

/* Loading Content */
.loader-content {
    text-align: center;
    color: white;
    max-width: 300px;
    padding: 2rem;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
}

.theme-light .loader-content {
    color: #333;
    background: rgba(255, 255, 255, 0.9);
}

/* Spinner Animations */
.spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem auto;
    position: relative;
}

/* Solar Panel Spinner */
.spinner-solar {
    border: 4px solid rgba(255, 136, 0, 0.2);
    border-top: 4px solid #ff8800;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Dots Spinner */
.spinner-dots {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 60px;
    height: 20px;
}

.spinner-dots .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary, #ff8800);
    animation: dotBounce 1.4s ease-in-out infinite both;
}

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

/* Pulse Spinner */
.spinner-pulse {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-primary, #ff8800);
    animation: pulse 1.5s ease-in-out infinite;
}

/* Wave Spinner */
.spinner-wave {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 60px;
    height: 40px;
}

.spinner-wave .bar {
    width: 8px;
    background: var(--color-primary, #ff8800);
    animation: wave 1.2s ease-in-out infinite;
}

.spinner-wave .bar:nth-child(1) { animation-delay: -1.2s; }
.spinner-wave .bar:nth-child(2) { animation-delay: -1.1s; }
.spinner-wave .bar:nth-child(3) { animation-delay: -1.0s; }
.spinner-wave .bar:nth-child(4) { animation-delay: -0.9s; }
.spinner-wave .bar:nth-child(5) { animation-delay: -0.8s; }

/* Button Loading States */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Small inline spinner */
.spinner-sm {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
    vertical-align: middle;
}

/* Form loading overlay */
.form-loading {
    position: relative;
}

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

.form-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top: 3px solid var(--color-primary, #ff8800);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 11;
}

/* Progress Bar Loading */
.loading-progress {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 1rem;
}

.loading-progress-bar {
    height: 100%;
    background: var(--color-primary, #ff8800);
    border-radius: 2px;
    animation: progressIndeterminate 2s linear infinite;
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, 
        rgba(255,255,255,0.05) 25%, 
        rgba(255,255,255,0.15) 50%, 
        rgba(255,255,255,0.05) 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
    border-radius: 4px;
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.skeleton-card {
    height: 200px;
    width: 100%;
}

/* Loading states for specific components */
.table-loading tbody {
    position: relative;
}

.table-loading tbody::after {
    content: 'Loading...';
    position: absolute;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 2rem;
    background: var(--color-bg-secondary, #fff);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 10;
}

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

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

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes wave {
    0%, 40%, 100% { transform: scaleY(0.4); }
    20% { transform: scaleY(1); }
}

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

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

/* Responsive adjustments */
@media (max-width: 768px) {
    .loader-content {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .spinner {
        width: 50px;
        height: 50px;
    }
}

/* Dark theme adjustments */
.theme-dark .form-loading::after {
    background: rgba(0, 0, 0, 0.8);
}

.theme-dark .skeleton {
    background: linear-gradient(90deg, 
        rgba(255,255,255,0.02) 25%, 
        rgba(255,255,255,0.08) 50%, 
        rgba(255,255,255,0.02) 75%);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    .spinner,
    .spinner-solar,
    .spinner-dots .dot,
    .spinner-pulse,
    .spinner-wave .bar,
    .btn-loading::after,
    .spinner-sm,
    .loading-progress-bar,
    .skeleton {
        animation: none;
    }
    
    .page-loader {
        transition: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .loader-content {
        background: #000;
        color: #fff;
        border: 2px solid #fff;
    }
    
    .theme-light .loader-content {
        background: #fff;
        color: #000;
        border: 2px solid #000;
    }
}