/**
 * Loading Spinner Styles
 * Provides consistent loading states across all Firebase data fetches
 */

/* Spinner Wrapper */
.loading-spinner-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    min-height: 100px;
}

.loading-spinner-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.5rem 0;
}

/* Spinner Container */
.loading-spinner {
    display: inline-block;
    position: relative;
}

/* Spinner Icon */
.spinner-icon {
    border: 3px solid rgba(147, 112, 219, 0.15);
    border-top-color: var(--color-primary, #9370DB);
    border-right-color: rgba(147, 112, 219, 0.6);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    box-shadow: 0 0 12px rgba(147, 112, 219, 0.4);
}

/* Spinner Sizes */
.spinner-small .spinner-icon {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.spinner-medium .spinner-icon {
    width: 40px;
    height: 40px;
    border-width: 3px;
}

.spinner-large .spinner-icon {
    width: 60px;
    height: 60px;
    border-width: 4px;
}

/* Spinner Message */
.spinner-message {
    margin-top: 1rem;
    color: var(--color-text-secondary, #adb5bd);
    font-size: 0.9rem;
    text-align: center;
    animation: pulse-text 2.2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    letter-spacing: 0.2px;
}

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

@keyframes pulse-text {
    0%, 100% {
        opacity: 0.6;
    }
    40%, 60% {
        opacity: 1;
    }
}

/* Inline Spinner Specific Styles */
.loading-spinner-inline .loading-spinner {
    margin: 0;
}

.loading-spinner-inline .spinner-message {
    margin-top: 0;
    margin-left: 0.5rem;
    font-size: 0.85rem;
}

/* Grid Loading State */
.grid-loading {
    grid-column: 1 / -1; /* Span all columns */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

/* Panel Card Loading Skeleton */
.panel-card-skeleton {
    background: var(--color-bg-secondary, rgba(255, 255, 255, 0.04));
    border: 1px solid var(--color-border, rgba(147, 112, 219, 0.15));
    border-radius: 12px;
    padding: 1.5rem;
    animation: skeleton-pulse 2.4s ease-in-out infinite;
    overflow: hidden;
}

.panel-card-skeleton .skeleton-image {
    width: 100%;
    height: 150px;
    background: linear-gradient(
        90deg,
        rgba(147, 112, 219, 0.1) 0%,
        rgba(147, 112, 219, 0.2) 50%,
        rgba(147, 112, 219, 0.1) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 2s ease-in-out infinite;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.panel-card-skeleton .skeleton-title {
    width: 70%;
    height: 1.5rem;
    background: linear-gradient(
        90deg,
        rgba(147, 112, 219, 0.1) 0%,
        rgba(147, 112, 219, 0.2) 50%,
        rgba(147, 112, 219, 0.1) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 2s ease-in-out infinite;
    border-radius: 4px;
    margin-bottom: 0.75rem;
}

.panel-card-skeleton .skeleton-text {
    width: 100%;
    height: 1rem;
    background: linear-gradient(
        90deg,
        rgba(147, 112, 219, 0.1) 0%,
        rgba(147, 112, 219, 0.2) 50%,
        rgba(147, 112, 219, 0.1) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 2s ease-in-out infinite;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

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

@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes skeleton-shimmer {
    0% {
        background-position: -200% 0;
    }
    50% {
        background-position: 200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Loading Overlay (for full page loading) */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.loading-overlay .loading-spinner-wrapper {
    background: var(--color-bg-primary, #0a0a0a);
    border: 2px solid var(--color-primary, #9370DB);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .loading-spinner-wrapper {
        padding: 1.5rem;
    }

    .spinner-large .spinner-icon {
        width: 50px;
        height: 50px;
        border-width: 3px;
    }

    .spinner-medium .spinner-icon {
        width: 35px;
        height: 35px;
    }

    .spinner-message {
        font-size: 0.85rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .spinner-icon {
        border-color: rgba(147, 112, 219, 0.3);
        border-top-color: #DAA520;
    }

    .panel-card-skeleton {
        background: rgba(0, 0, 0, 0.3);
    }
}

/* ============================================
   LOADING STATE TRANSITIONS
   Smooth fade-out/fade-in for content replacement
   ============================================ */

/* Loading spinner fade-out animation */
.loading-spinner-wrapper.fade-out {
    opacity: 0;
    transition: opacity 0.3s ease-out;
}

/* Content fade-in after loading */
.content-loaded {
    animation: contentFadeIn 0.4s ease-out forwards;
}

@keyframes contentFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading container fade-out */
.loading-container.fade-out {
    opacity: 0 !important;
    transition: opacity 0.3s ease-out !important;
    pointer-events: none;
}

/* Skeleton to content transition */
.skeleton-fade-out {
    opacity: 0;
    transition: opacity 0.3s ease-out;
    pointer-events: none;
}

/* Prevent layout shift during transitions */
.loading-transition-active {
    overflow: hidden;
    min-height: inherit;
}

/* Initial loading spinner (from index.html) specific styles */
#main-content > .loading-container {
    position: relative;
    z-index: 10;
}

/* Ensure smooth transition when SPA replaces initial content */
#main-content.transitioning > * {
    transition: opacity 0.3s ease-out;
}

/* Reduced motion support for transitions */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner-wrapper.fade-out,
    .content-loaded,
    .loading-container.fade-out,
    .skeleton-fade-out,
    #main-content.transitioning > * {
        animation: none !important;
        transition: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}