/* ===================================================================
   LOADING.CSS - LOADING INDICATORS & SPINNERS
   ================================================================ */

/* ===================================================================
   FULL PAGE LOADER (For Page Navigation)
   ================================================================ */

.page-loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

    .page-loader-overlay.active {
        display: flex;
        opacity: 1;
    }

.page-loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

/* Spinner Animation */
.page-loader-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.page-loader-text {
    font-size: var(--text-base);
    color: var(--text-secondary);
    font-weight: var(--weight-medium);
}

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

/* ===================================================================
   INLINE LOADER (For Sections/Cards)
   ================================================================ */

.inline-loader {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
}

.inline-loader-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.inline-loader-text {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* ===================================================================
   BUTTON LOADER (For Form Submissions)
   ================================================================ */

.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

    .btn-loading::after {
        content: '';
        position: absolute;
        width: 16px;
        height: 16px;
        top: 50%;
        left: 50%;
        margin-left: -8px;
        margin-top: -8px;
        border: 2px solid currentColor;
        border-top-color: transparent;
        border-radius: 50%;
        animation: spin 0.6s linear infinite;
    }

/* ===================================================================
   PROGRESS BAR (Alternative to Spinner)
   ================================================================ */

.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border-color);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.2s ease;
}

    .progress-bar-container.active {
        opacity: 1;
    }

.progress-bar {
    height: 100%;
    background: var(--accent-primary);
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--accent-primary);
}

/* Indeterminate progress bar */
.progress-bar-indeterminate {
    width: 30%;
    animation: progressIndeterminate 1.5s ease-in-out infinite;
}

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

    50% {
        transform: translateX(300%);
    }

    100% {
        transform: translateX(-100%);
    }
}

/* ===================================================================
   SKELETON LOADER (For Content Placeholders)
   ================================================================ */

.skeleton {
    background: linear-gradient( 90deg, var(--border-color) 0%, rgba(240, 240, 240, 0.8) 50%, var(--border-color) 100% );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

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

    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-xs);
}

.skeleton-text-sm {
    height: 0.75em;
}

.skeleton-text-lg {
    height: 1.5em;
}

.skeleton-card {
    height: 200px;
}

.skeleton-circle {
    border-radius: 50%;
}

/* ===================================================================
   LOADING STATE CLASSES
   ================================================================ */

.loading-blur {
    filter: blur(2px);
    pointer-events: none;
    user-select: none;
}

.loading-dim {
    opacity: 0.5;
    pointer-events: none;
}

/* ===================================================================
   RESPONSIVE
   ================================================================ */

@media (max-width: 768px) {
    .page-loader-spinner {
        width: 40px;
        height: 40px;
        border-width: 3px;
    }

    .page-loader-text {
        font-size: var(--text-sm);
    }
}

/* ===================================================================
   DARK MODE SUPPORT
   ================================================================ */

@media (prefers-color-scheme: dark) {
    .page-loader-overlay {
        background: rgba(31, 41, 55, 0.9);
    }

    .skeleton {
        background: linear-gradient( 90deg, #374151 0%, rgba(75, 85, 99, 0.8) 50%, #374151 100% );
    }
}

/* ===================================================================
   REDUCED MOTION
   ================================================================ */

@media (prefers-reduced-motion: reduce) {
    .page-loader-spinner,
    .inline-loader-spinner,
    .btn-loading::after,
    .progress-bar,
    .skeleton {
        animation: none !important;
    }
}