/* ==========================================================
   SKELETON LOADER SYSTEM
   Premium loading animations with dark mode support
   ========================================================== */

/* ============================================
   BASE SKELETON
   ============================================ */
.skeleton {
    position: relative;
    overflow: hidden;
    background: var(--slate-200);
    border-radius: var(--radius-md);
}

[data-theme="dark"] .skeleton {
    background: var(--slate-700);
}

/* Shimmer Animation */
.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.4) 50%,
        transparent 100%
    );
    animation: skeleton-shimmer 1.5s infinite;
    transform: translateX(-100%);
}

[data-theme="dark"] .skeleton::after {
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.08) 50%,
        transparent 100%
    );
}

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

/* ============================================
   SKELETON SHAPES
   ============================================ */
.skeleton-text {
    height: 1rem;
    border-radius: var(--radius-sm);
}

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

.skeleton-text-lg {
    height: 1.25rem;
}

.skeleton-title {
    height: 1.5rem;
    width: 60%;
}

.skeleton-circle {
    border-radius: var(--radius-full);
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.skeleton-avatar-sm {
    width: 32px;
    height: 32px;
}

.skeleton-avatar-lg {
    width: 56px;
    height: 56px;
}

.skeleton-button {
    height: 36px;
    width: 100px;
    border-radius: var(--radius-md);
}

.skeleton-button-sm {
    height: 32px;
    width: 80px;
}

.skeleton-icon {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-sm);
}

.skeleton-badge {
    width: 60px;
    height: 22px;
    border-radius: var(--radius-full);
}

/* ============================================
   SKELETON TABLE
   ============================================ */
.skeleton-table {
    width: 100%;
}

.skeleton-table-row {
    display: flex;
    align-items: center;
    padding: 0.875rem 1rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.skeleton-table-row:last-child {
    border-bottom: none;
}

.skeleton-table-cell {
    height: 1rem;
    border-radius: var(--radius-sm);
}

.skeleton-table-cell.cell-sm {
    flex: 0 0 60px;
}

.skeleton-table-cell.cell-md {
    flex: 0 0 120px;
}

.skeleton-table-cell.cell-lg {
    flex: 1;
}

.skeleton-table-cell.cell-action {
    flex: 0 0 80px;
    display: flex;
    gap: 0.5rem;
}

.skeleton-table-cell.cell-action .skeleton {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
}

/* Table Header Skeleton */
.skeleton-table-header {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    gap: 1rem;
    background: var(--bg-hover);
    border-bottom: 1px solid var(--border-color);
}

.skeleton-table-header .skeleton {
    height: 0.75rem;
    background: var(--slate-300);
}

[data-theme="dark"] .skeleton-table-header .skeleton {
    background: var(--slate-600);
}

/* ============================================
   SKELETON CARD
   ============================================ */
.skeleton-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
}

.skeleton-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.skeleton-card-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ============================================
   SKELETON STAT CARD
   ============================================ */
.skeleton-stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.skeleton-stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.skeleton-stat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skeleton-stat-label {
    height: 0.75rem;
    width: 60%;
}

.skeleton-stat-value {
    height: 2rem;
    width: 80%;
}

.skeleton-stat-change {
    height: 0.75rem;
    width: 40%;
}

/* ============================================
   SKELETON LIST
   ============================================ */
.skeleton-list {
    display: flex;
    flex-direction: column;
}

.skeleton-list-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.skeleton-list-item:last-child {
    border-bottom: none;
}

.skeleton-list-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

/* ============================================
   SKELETON FORM
   ============================================ */
.skeleton-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skeleton-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skeleton-form-label {
    height: 0.875rem;
    width: 30%;
}

.skeleton-form-input {
    height: 38px;
    border-radius: var(--radius-md);
}

.skeleton-form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 767.98px) {
    .skeleton-form-row {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   SKELETON PAGE LAYOUTS
   ============================================ */
/* Page Header */
.skeleton-page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.skeleton-page-title {
    height: 1.75rem;
    width: 200px;
}

.skeleton-page-actions {
    display: flex;
    gap: 0.5rem;
}

/* Stats Grid */
.skeleton-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 1199.98px) {
    .skeleton-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575.98px) {
    .skeleton-stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Full Page Skeleton */
.skeleton-page {
    animation: skeleton-fade-in 0.3s ease-out;
}

@keyframes skeleton-fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================
   SKELETON DETAIL PAGE
   ============================================ */
.skeleton-detail {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 991.98px) {
    .skeleton-detail {
        grid-template-columns: 1fr;
    }
}

.skeleton-detail-main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skeleton-detail-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skeleton-detail-field {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.skeleton-detail-label {
    height: 0.75rem;
    width: 40%;
}

.skeleton-detail-value {
    height: 1rem;
    width: 70%;
}

/* ============================================
   SKELETON DASHBOARD
   ============================================ */
.skeleton-dashboard {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skeleton-chart {
    height: 300px;
    border-radius: var(--radius-lg);
}

.skeleton-chart-sm {
    height: 200px;
}

/* ============================================
   LOADING OVERLAY
   ============================================ */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: inherit;
}

[data-theme="dark"] .loading-overlay {
    background: rgba(15, 23, 42, 0.8);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--slate-200);
    border-top-color: var(--primary-500);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

[data-theme="dark"] .loading-spinner {
    border-color: var(--slate-700);
    border-top-color: var(--primary-400);
}

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

/* Inline Spinner */
.spinner-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.spinner-lg {
    width: 48px;
    height: 48px;
    border-width: 4px;
}

/* ============================================
   PULSE ANIMATION
   ============================================ */
.skeleton-pulse {
    animation: skeleton-pulse 2s ease-in-out infinite;
}

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

/* ============================================
   LOADING STATE FOR BUTTONS
   ============================================ */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   CONTENT LOADING STATES
   ============================================ */
[data-loading="true"] {
    position: relative;
    pointer-events: none;
}

[data-loading="true"]::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(2px);
    z-index: 5;
}

[data-theme="dark"] [data-loading="true"]::after {
    background: rgba(15, 23, 42, 0.6);
}

/* ============================================
   SKELETON VISIBILITY UTILITIES
   ============================================ */
.skeleton-show {
    display: block;
}

.skeleton-hide {
    display: none;
}

/* Hide skeleton when content is loaded */
.content-loaded .skeleton-content {
    display: none;
}

.content-loading .real-content {
    display: none;
}

/* ============================================
   SKELETON IMAGE
   ============================================ */
.skeleton-image {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
}

.skeleton-image.square {
    aspect-ratio: 1;
}

.skeleton-image.portrait {
    aspect-ratio: 3/4;
}

/* ============================================
   SKELETON DROPDOWN
   ============================================ */
.skeleton-dropdown {
    padding: 0.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.skeleton-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
}

.skeleton-dropdown-item .skeleton-icon {
    width: 16px;
    height: 16px;
}

.skeleton-dropdown-item .skeleton-text {
    flex: 1;
    height: 0.875rem;
}