/* Professional Loading States */
/* ========================== */

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Main loading container */
.loading-container {
    text-align: center;
    position: relative;
}

/* Loading spinner */
.loading-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(0, 212, 255, 0.2);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 2rem;
    position: relative;
}

.loading-spinner::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 3px solid transparent;
    border-top: 3px solid var(--accent-purple);
    border-radius: 50%;
    animation: spin 1.5s linear infinite reverse;
}

.loading-spinner::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    right: 3px;
    bottom: 3px;
    border: 2px solid transparent;
    border-top: 2px solid var(--accent-green);
    border-radius: 50%;
    animation: spin 2s linear infinite;
}

/* Loading text */
.loading-text {
    color: var(--text-accent);
    font-family: 'Orbitron', monospace;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 2px;
    animation: pulse 2s ease-in-out infinite;
}

/* Loading progress */
.loading-progress {
    width: 200px;
    height: 4px;
    background: rgba(0, 212, 255, 0.2);
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-purple), var(--accent-green));
    border-radius: 2px;
    width: 0%;
    animation: progress 2s ease-in-out infinite;
    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, 0.4), transparent);
    animation: shimmer 1.5s ease-in-out infinite;
}

/* Loading dots */
.loading-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

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

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
    background: var(--accent-purple);
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
    background: var(--accent-green);
}

/* Skeleton loading for content */
.skeleton {
    background: linear-gradient(90deg, rgba(0, 212, 255, 0.1) 25%, rgba(0, 212, 255, 0.2) 50%, rgba(0, 212, 255, 0.1) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s ease-in-out infinite;
    border-radius: 4px;
}

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

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

.skeleton-card {
    height: 200px;
    border-radius: 12px;
    margin-bottom: 1rem;
}

/* Page-specific loading states */
.page-loading {
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.page-loading .loading-spinner {
    width: 40px;
    height: 40px;
    margin-bottom: 1rem;
}

.page-loading .loading-text {
    font-size: 1rem;
}

/* Button loading state */
.btn-loading {
    position: relative;
    pointer-events: none;
}

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

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

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

@keyframes dotPulse {
    0%, 80%, 100% { 
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% { 
        transform: scale(1);
        opacity: 1;
    }
}

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

/* Responsive loading */
@media (max-width: 768px) {
    .loading-spinner {
        width: 50px;
        height: 50px;
    }
    
    .loading-text {
        font-size: 1rem;
        letter-spacing: 1px;
    }
    
    .loading-progress {
        width: 150px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner,
    .loading-spinner::before,
    .loading-spinner::after,
    .loading-progress-bar,
    .loading-dot,
    .skeleton {
        animation: none;
    }
    
    .loading-spinner {
        border-top-color: var(--primary-blue);
    }
    
    .loading-progress-bar {
        width: 100%;
    }
    
    .loading-dot {
        opacity: 1;
        transform: scale(1);
    }
}