/* Loading States & Skeleton Loaders */

/* Spinner Animation */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Pulse Animation for Skeletons */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Shimmer Animation */
@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    border-top-color: #3b82f6;
    animation: spin 0.8s linear infinite;
}

.loading-spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

/* Skeleton Loader Base */
.skeleton {
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s linear infinite;
    border-radius: 4px;
}

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

.skeleton-text-sm {
    height: 12px;
    margin-bottom: 6px;
}

.skeleton-text-lg {
    height: 20px;
    margin-bottom: 10px;
}

/* Skeleton Table Row */
.skeleton-table-row {
    display: flex;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid #e5e7eb;
}

.skeleton-table-cell {
    flex: 1;
    height: 20px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s linear infinite;
    border-radius: 4px;
}

/* Skeleton Card (for Kanban) */
.skeleton-card {
    background: white;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.skeleton-card-title {
    height: 18px;
    width: 70%;
    margin-bottom: 12px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s linear infinite;
    border-radius: 4px;
}

.skeleton-card-text {
    height: 14px;
    width: 50%;
    margin-bottom: 8px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s linear infinite;
    border-radius: 4px;
}

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

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 32px;
    text-align: center;
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    color: #9ca3af;
    font-size: 48px;
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 8px;
}

.empty-state-description {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 24px;
    max-width: 400px;
}

.empty-state-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: #3b82f6;
    color: white;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s;
}

.empty-state-action:hover {
    background: #2563eb;
}

/* Input Validation States */
.input-valid {
    border-color: #10b981 !important;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2310b981'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px 20px;
    padding-right: 40px !important;
}

.input-invalid {
    border-color: #ef4444 !important;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23ef4444'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z' clip-rule='evenodd'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px 20px;
    padding-right: 40px !important;
}

.input-validating {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236b7280'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm1-12a1 1 0 10-2 0v4a1 1 0 00.293.707l2.828 2.829a1 1 0 101.415-1.415L11 9.586V6z' clip-rule='evenodd'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px 20px;
    padding-right: 40px !important;
}

.validation-message {
    font-size: 12px;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.validation-message-error {
    color: #ef4444;
}

.validation-message-success {
    color: #10b981;
}

.validation-message-warning {
    color: #f59e0b;
}

/* Required Field Indicator */
.required-field::after {
    content: '*';
    color: #ef4444;
    margin-left: 4px;
    font-weight: 600;
}

/* Fade In Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}