/* ========================================
   UI Improvements CSS
   - Skeleton Loading
   - Toast Notifications
   - Better Focus States
   - Accessibility Improvements
   ======================================== */

/* ========================================
   1. SKELETON LOADING
   ======================================== */

.skeleton {
    background: linear-gradient(90deg, #1a1a1a 25%, #2a2a2a 50%, #1a1a1a 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    animation: skeleton-shimmer 2s infinite;
}

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

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

/* Skeleton variants */
.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-title {
    height: 2rem;
    width: 60%;
    margin-bottom: 1rem;
}

.skeleton-card {
    height: 200px;
    border-radius: 8px;
}

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

.skeleton-button {
    height: 40px;
    width: 120px;
    border-radius: 6px;
}

/* ========================================
   2. TOAST NOTIFICATIONS
   ======================================== */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 250px;
    max-width: 400px;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.hide {
    opacity: 0;
    transform: translateX(400px);
}

.toast-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.toast-error {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.toast-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.toast-info {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    font-size: 1.25rem;
    opacity: 0.7;
    transition: opacity 0.2s;
}

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

/* ========================================
   3. IMPROVED FOCUS STATES
   ======================================== */

/* Better focus indicators for accessibility */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid #00d9ff;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Remove default focus outline but keep for keyboard users */
*:focus:not(:focus-visible) {
    outline: none;
}

/* ========================================
   4. ACCESSIBILITY IMPROVEMENTS
   ======================================== */

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: #00d9ff;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 4px 0;
}

.skip-to-main:focus {
    top: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .skeleton {
        background: linear-gradient(90deg, #000 25%, #333 50%, #000 75%);
    }

    button:focus-visible,
    a:focus-visible,
    input:focus-visible {
        outline-width: 3px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .skeleton,
    .skeleton::after,
    .toast {
        animation: none;
        transition: none;
    }
}

/* ========================================
   5. ERROR STATES
   ======================================== */

.error-message {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(220, 38, 38, 0.1) 100%);
    border-left: 4px solid #ef4444;
    padding: 1rem;
    border-radius: 4px;
    margin: 1rem 0;
    display: flex;
    align-items: start;
    gap: 12px;
}

.error-message-icon {
    color: #ef4444;
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.error-message-content h4 {
    color: #ef4444;
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    font-weight: 600;
}

.error-message-content p {
    margin: 0;
    color: #d1d5db;
    font-size: 0.875rem;
}

.error-message-actions {
    margin-top: 0.75rem;
    display: flex;
    gap: 8px;
}

.error-message-actions button {
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #9ca3af;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    color: #d1d5db;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: #9ca3af;
    margin-bottom: 1.5rem;
}

/* ========================================
   6. LOADING STATES
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.loading-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(0, 217, 255, 0.2);
    border-top-color: #00d9ff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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