/* Loading Indicators - Spinners and overlays */

/* Loading overlay - Full screen */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
}

.loading-overlay.show {
    display: flex;
}

/* Loading container */
.loading-container {
    text-align: center;
    color: white;
}

/* Spinner styles */
.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 15px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner.small {
    width: 20px;
    height: 20px;
    border-width: 2px;
    margin: 0;
}

.spinner.medium {
    width: 35px;
    height: 35px;
    border-width: 3px;
}

.spinner.large {
    width: 60px;
    height: 60px;
    border-width: 5px;
}

/* Spinner colors */
.spinner.primary {
    border-color: rgba(33, 150, 243, 0.3);
    border-top-color: #2196F3;
}

.spinner.success {
    border-color: rgba(76, 175, 80, 0.3);
    border-top-color: #4CAF50;
}

.spinner.danger {
    border-color: rgba(244, 67, 54, 0.3);
    border-top-color: #f44336;
}

.spinner.warning {
    border-color: rgba(255, 152, 0, 0.3);
    border-top-color: #FF9800;
}

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

/* Loading text */
.loading-text {
    font-size: 16px;
    font-weight: 500;
    margin-top: 10px;
}

/* Dots animation for loading text */
.loading-dots::after {
    content: '';
    animation: dots 1.5s steps(4, end) infinite;
}

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

/* Inline loading (for buttons) */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading .btn-text {
    visibility: hidden;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Loading bar (progress) */
.loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
    z-index: 9999;
    overflow: hidden;
    display: none;
}

.loading-bar.show {
    display: block;
}

.loading-bar-progress {
    height: 100%;
    background: linear-gradient(90deg, #2196F3, #4CAF50, #2196F3);
    background-size: 200% 100%;
    animation: loadingBarProgress 1.5s linear infinite;
}

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

/* Skeleton loading (for content) */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
}

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

.skeleton.text {
    height: 16px;
    margin: 8px 0;
}

.skeleton.title {
    height: 24px;
    margin: 12px 0;
    width: 60%;
}

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

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

/* Pulse animation (alternative loading) */
.pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

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

/* Bounce loader */
.bounce-loader {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

.bounce-loader span {
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.bounce-loader span:nth-child(1) {
    animation-delay: -0.32s;
}

.bounce-loader span:nth-child(2) {
    animation-delay: -0.16s;
}

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

/* Circular progress */
.circular-progress {
    width: 50px;
    height: 50px;
    position: relative;
}

.circular-progress svg {
    transform: rotate(-90deg);
}

.circular-progress circle {
    fill: none;
    stroke-width: 4;
    stroke-linecap: round;
}

.circular-progress .circle-bg {
    stroke: rgba(255, 255, 255, 0.3);
}

.circular-progress .circle-progress {
    stroke: white;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    animation: circularProgress 2s ease-in-out infinite;
}

@keyframes circularProgress {
    0% {
        stroke-dashoffset: 283;
    }
    50% {
        stroke-dashoffset: 75;
    }
    100% {
        stroke-dashoffset: 283;
    }
}

/* Loading card placeholder */
.loading-card {
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.loading-card .skeleton {
    margin: 10px 0;
}

/* Inline spinner (for text) */
.inline-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
    margin: 0 5px;
}

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

/* Shimmer effect */
.shimmer {
    position: relative;
    overflow: hidden;
}

.shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0,
        rgba(255, 255, 255, 0.3) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    animation: shimmer 2s infinite;
}

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

/* Loading state utilities */
.is-loading {
    pointer-events: none;
    opacity: 0.6;
    cursor: wait;
}

.hide-while-loading {
    display: none !important;
}

/* Responsive loading */
@media (max-width: 768px) {
    .spinner {
        width: 40px;
        height: 40px;
    }
    
    .loading-text {
        font-size: 14px;
    }
}