/* ===========================================
   LightSkai Loading Spinner System
   Provides consistent loading states across dashboards
   =========================================== */

/* Main Loading Overlay */
.ls-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 250, 252, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.3s ease-out;
}

.ls-loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.ls-loading-overlay.fade-out {
    opacity: 0;
}

/* Dark theme support */
.dark-theme .ls-loading-overlay {
    background: rgba(15, 23, 42, 0.95);
}

/* Spinner Container */
.ls-spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

/* Modern Spinner Animation */
.ls-spinner {
    width: 56px;
    height: 56px;
    position: relative;
}

.ls-spinner::before,
.ls-spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
}

.ls-spinner::before {
    width: 100%;
    height: 100%;
    border: 4px solid #e2e8f0;
    border-top-color: #0EA5E9;
    animation: ls-spin 1s linear infinite;
}

.ls-spinner::after {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border: 3px solid transparent;
    border-top-color: #2563EB;
    animation: ls-spin 0.8s linear infinite reverse;
}

.dark-theme .ls-spinner::before {
    border-color: #334155;
    border-top-color: #0EA5E9;
}

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

/* Loading Text */
.ls-loading-text {
    font-size: 16px;
    font-weight: 500;
    color: #64748b;
    text-align: center;
}

.ls-loading-text .ls-loading-dots {
    display: inline-block;
    width: 24px;
    text-align: left;
}

.dark-theme .ls-loading-text {
    color: #94a3b8;
}

/* Loading Subtext */
.ls-loading-subtext {
    font-size: 13px;
    color: #94a3b8;
    margin-top: -12px;
}

.dark-theme .ls-loading-subtext {
    color: #64748b;
}

/* Progress Bar (optional) */
.ls-progress-bar {
    width: 200px;
    height: 4px;
    background: #e2e8f0;
    border-radius: 2px;
    overflow: hidden;
    margin-top: 8px;
}

.dark-theme .ls-progress-bar {
    background: #334155;
}

.ls-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #0EA5E9, #2563EB);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s ease;
}

.ls-progress-bar-fill.indeterminate {
    width: 30%;
    animation: ls-progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes ls-progress-indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

/* ===========================================
   Section/Card Loading States
   =========================================== */

/* Skeleton Loading for Stats Cards */
.ls-skeleton {
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: ls-skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
}

.dark-theme .ls-skeleton {
    background: linear-gradient(90deg, #334155 25%, #475569 50%, #334155 75%);
    background-size: 200% 100%;
}

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

.ls-skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.ls-skeleton-text.large {
    height: 32px;
    width: 80px;
}

.ls-skeleton-text.small {
    height: 12px;
    width: 60%;
}

/* Card Loading State */
.stat-card.loading .stat-value,
.stat-card.loading .stat-label {
    color: transparent;
    position: relative;
}

.stat-card.loading .stat-value::after,
.stat-card.loading .stat-label::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: ls-skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
}

.dark-theme .stat-card.loading .stat-value::after,
.dark-theme .stat-card.loading .stat-label::after {
    background: linear-gradient(90deg, #334155 25%, #475569 50%, #334155 75%);
    background-size: 200% 100%;
}

/* Chart Loading State */
.chart-card.loading .chart-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
    border-radius: 8px;
}

.dark-theme .chart-card.loading .chart-container {
    background: #1e293b;
}

.chart-card.loading .chart-container::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 3px solid #e2e8f0;
    border-top-color: #0EA5E9;
    border-radius: 50%;
    animation: ls-spin 1s linear infinite;
}

.dark-theme .chart-card.loading .chart-container::after {
    border-color: #334155;
    border-top-color: #0EA5E9;
}

/* Table Loading State */
.table-container.loading tbody {
    opacity: 0.5;
}

.table-container.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    border: 3px solid #e2e8f0;
    border-top-color: #0EA5E9;
    border-radius: 50%;
    animation: ls-spin 1s linear infinite;
}

/* ===========================================
   Inline Spinners (for buttons, inputs, etc.)
   =========================================== */

.ls-spinner-inline {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: ls-spin 0.8s linear infinite;
    opacity: 0.7;
}

.ls-spinner-inline.small {
    width: 12px;
    height: 12px;
    border-width: 1.5px;
}

.ls-spinner-inline.large {
    width: 24px;
    height: 24px;
    border-width: 3px;
}

/* Button Loading State */
button.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

button.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: ls-spin 0.8s linear infinite;
}

/* ===========================================
   Content Fade-In After Loading
   =========================================== */

.ls-content-loaded {
    animation: ls-fade-in 0.4s ease-out;
}

@keyframes ls-fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Staggered fade-in for multiple elements */
.ls-content-loaded:nth-child(1) { animation-delay: 0ms; }
.ls-content-loaded:nth-child(2) { animation-delay: 50ms; }
.ls-content-loaded:nth-child(3) { animation-delay: 100ms; }
.ls-content-loaded:nth-child(4) { animation-delay: 150ms; }
.ls-content-loaded:nth-child(5) { animation-delay: 200ms; }
.ls-content-loaded:nth-child(6) { animation-delay: 250ms; }