/**
 * LOADING STATES & FEEDBACK
 * Singularity Council - User Experience Excellence
 * Provides visual feedback for all async actions
 */

/* ============================================
   LOADING SPINNER
   ============================================ */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-white);
    animation: spin 0.8s linear infinite;
}

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

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

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

/* ============================================
   BUTTON LOADING STATES
   ============================================ */

.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-white);
    animation: spin 0.8s linear infinite;
}

.btn-outline.btn-loading::after {
    border-color: rgba(10, 77, 104, 0.3);
    border-top-color: var(--color-primary);
}

/* ============================================
   FORM LOADING STATES
   ============================================ */

.form-loading {
    position: relative;
    opacity: 0.7;
    pointer-events: none;
}

.form-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 10;
    border-radius: var(--radius-lg);
}

.form-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 4px solid rgba(10, 77, 104, 0.2);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 0.8s linear infinite;
    z-index: 11;
}

/* ============================================
   SUCCESS FEEDBACK
   ============================================ */

.success-feedback {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-success);
    color: var(--color-white);
    border-radius: var(--radius-md);
    animation: slideInDown 0.3s ease-out;
}

.success-feedback::before {
    content: '✓';
    font-size: 1.5rem;
    font-weight: bold;
    animation: checkmark 0.5s ease-out;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes checkmark {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

/* ============================================
   ERROR FEEDBACK
   ============================================ */

.error-feedback {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-error);
    color: var(--color-white);
    border-radius: var(--radius-md);
    animation: shake 0.5s ease-out;
}

.error-feedback::before {
    content: '✕';
    font-size: 1.5rem;
    font-weight: bold;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* ============================================
   INPUT VALIDATION STATES
   ============================================ */

.input-valid {
    border-color: var(--color-success);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.input-valid::after {
    content: '✓';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-success);
    font-weight: bold;
}

.input-invalid {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
    animation: shake 0.3s ease-out;
}

.input-invalid::after {
    content: '✕';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-error);
    font-weight: bold;
}

/* ============================================
   IMAGE LOADING STATES
   ============================================ */

.image-loading {
    position: relative;
    background: var(--color-gray-100);
    overflow: hidden;
}

.image-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.image-loaded {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ============================================
   PROGRESS INDICATORS
   ============================================ */

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width 0.3s ease-out;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* ============================================
   SKELETON LOADERS
   ============================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 0%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

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

.skeleton-text {
    height: 1em;
    margin-bottom: var(--spacing-sm);
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--spacing-md);
}

.skeleton-image {
    width: 100%;
    height: 200px;
    margin-bottom: var(--spacing-md);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast-success {
    background: var(--color-success);
    color: var(--color-white);
}

.toast-error {
    background: var(--color-error);
    color: var(--color-white);
}

.toast-info {
    background: var(--color-primary);
    color: var(--color-white);
}

.toast-warning {
    background: var(--color-warning);
    color: var(--color-white);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.toast-close:hover {
    opacity: 1;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
    .toast-container {
        top: var(--spacing-md);
        right: var(--spacing-md);
        left: var(--spacing-md);
        max-width: 100%;
    }
    
    .toast {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}