/**
 * La Tanda - Unified Loading States
 * Version: 1.0.0
 */

/* Skeleton Loading Animation */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

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

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

/* Base Skeleton */
.skeleton {
    background: linear-gradient(90deg,
        rgba(255,255,255,0.05) 25%,
        rgba(255,255,255,0.1) 50%,
        rgba(255,255,255,0.05) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

.skeleton-text {
    height: 14px;
    margin-bottom: 8px;
    border-radius: 4px;
}

.skeleton-text.short { width: 60%; }
.skeleton-text.medium { width: 80%; }
.skeleton-text.full { width: 100%; }

.skeleton-title {
    height: 24px;
    width: 50%;
    margin-bottom: 16px;
    border-radius: 6px;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.skeleton-card {
    padding: 20px;
    border-radius: 12px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
}

.skeleton-button {
    height: 40px;
    width: 120px;
    border-radius: 8px;
}

/* Loading Spinner */
.loading-spinner {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.loading-spinner::before {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-top-color: var(--tanda-cyan, #00FFFF);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner.small::before {
    width: 14px;
    height: 14px;
    border-width: 2px;
}

.loading-spinner.large::before {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

/* Button Loading State */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

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

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

/* Full Page Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-overlay .spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(0, 255, 255, 0.2);
    border-top-color: #00FFFF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-overlay .loading-text {
    margin-top: 16px;
    color: rgba(255,255,255,0.8);
    font-size: 14px;
}

/* Card Loading State */
.card-loading {
    position: relative;
    min-height: 100px;
}

.card-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: inherit;
}

.card-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 2px solid rgba(0, 255, 255, 0.2);
    border-top-color: #00FFFF;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    z-index: 11;
}

/* Table Loading State */
.table-loading tbody tr {
    animation: pulse 1.5s ease-in-out infinite;
}

.table-loading td {
    background: rgba(255,255,255,0.03);
}

/* Tab Content Loading */
.tab-content-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

.tab-content-loading .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 255, 255, 0.2);
    border-top-color: #00FFFF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.tab-content-loading .loading-message {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
}

/* Progress Bar */
.progress-bar {
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar .progress {
    height: 100%;
    background: linear-gradient(90deg, #00FFFF, #7FFFD8);
    border-radius: 2px;
    transition: width 0.3s ease;
}

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

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

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

.empty-state i {
    font-size: 48px;
    color: rgba(255,255,255,0.2);
    margin-bottom: 16px;
}

.empty-state h3 {
    color: rgba(255,255,255,0.8);
    font-size: 18px;
    margin-bottom: 8px;
}

.empty-state p {
    color: rgba(255,255,255,0.5);
    font-size: 14px;
    max-width: 300px;
}

.empty-state .btn {
    margin-top: 20px;
}

/* Skeleton Card Template */
.skeleton-card-template {
    padding: 20px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
}

.skeleton-card-template .skeleton-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.skeleton-card-template .skeleton-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
}