/* ===========================
   Dashboard Loading & Error States
   =========================== */

/* ===========================
   Loading States
   =========================== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    min-height: 150px;
}

.loading-spinner {
    margin-bottom: var(--space-md);
}

.loading-spinner i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: spin 1s linear infinite;
}

.loading-message {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* スピンアニメーション */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===========================
   Error States
   =========================== */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    min-height: 150px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid #fee2e2;
}

.error-icon {
    margin-bottom: var(--space-md);
}

.error-icon i {
    font-size: 2rem;
    color: #ef4444;
}

.error-message {
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
}

.retry-btn {
    gap: var(--space-xs);
}

.retry-btn:hover {
    background: #ef4444;
    border-color: #ef4444;
    color: white;
}

/* ===========================
   Empty States
   =========================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    min-height: 150px;
    opacity: 0.7;
}

.empty-icon {
    margin-bottom: var(--space-md);
}

.empty-icon i {
    font-size: 2rem;
    color: var(--text-tertiary);
}

.empty-message {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===========================
   Container State Classes
   =========================== */
.is-loading {
    position: relative;
    overflow: hidden;
}

.is-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.6),
        transparent
    );
    animation: loading-shimmer 1.5s infinite;
    z-index: 1;
}

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

.has-error {
    background: #fef2f2;
    border-radius: var(--radius-md);
}

.is-empty {
    opacity: 0.8;
}

/* ===========================
   Statistics Card States
   =========================== */
.stat-card.is-loading .stat-value {
    background: var(--bg-secondary);
    color: transparent;
    border-radius: var(--radius-sm);
    animation: pulse 1.5s ease-in-out infinite;
}

.stat-card.is-loading .stat-label,
.stat-card.is-loading .stat-change {
    background: var(--bg-secondary);
    color: transparent;
    border-radius: var(--radius-sm);
    animation: pulse 1.5s ease-in-out infinite;
}

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

/* ===========================
   Activity & Event States
   =========================== */
.activity-item.is-loading,
.event-item.is-loading {
    animation: pulse 1.5s ease-in-out infinite;
}

.activity-item.is-loading .activity-content,
.event-item.is-loading .event-details {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

/* ===========================
   Update Status Indicator
   =========================== */
.update-status {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    z-index: 1000;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
}

.update-status.show {
    opacity: 1;
    transform: translateY(0);
}

.update-status.success {
    border-left: 4px solid var(--secondary-color);
}

.update-status.error {
    border-left: 4px solid #ef4444;
}

.update-status.loading {
    border-left: 4px solid var(--primary-color);
}

/* ===========================
   Last Refresh Time
   =========================== */
.last-refresh-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-md);
    padding: var(--space-sm);
}

/* ===========================
   Connection Status
   =========================== */
.connection-status {
    position: fixed;
    bottom: var(--space-md);
    left: var(--space-md);
    z-index: 1000;
    background: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    opacity: 0;
    transform: translateX(-100px);
    transition: all 0.3s ease;
}

.connection-status.show {
    opacity: 1;
    transform: translateX(0);
}

.connection-status.online {
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
}

.connection-status.offline {
    color: #ef4444;
    border: 1px solid #ef4444;
}

.connection-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

.connection-status.online .connection-status-dot {
    background: var(--secondary-color);
}

.connection-status.offline .connection-status-dot {
    background: #ef4444;
}

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

/* ===========================
   Data Freshness Indicator
   =========================== */
.data-freshness {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.data-freshness.fresh {
    background: var(--secondary-color);
}

.data-freshness.stale {
    background: #f59e0b;
}

.data-freshness.error {
    background: #ef4444;
}

/* ===========================
   Mobile Optimizations
   =========================== */
@media (max-width: 768px) {
    .loading-state,
    .error-state,
    .empty-state {
        padding: var(--space-lg);
        min-height: 120px;
    }
    
    .loading-spinner i,
    .error-icon i,
    .empty-icon i {
        font-size: 1.5rem;
    }
    
    .update-status {
        top: auto;
        bottom: var(--space-md);
        right: var(--space-md);
        left: var(--space-md);
        text-align: center;
    }
    
    .connection-status {
        position: static;
        margin: var(--space-md) auto;
        width: fit-content;
    }
}

/* ===========================
   Accessibility
   =========================== */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner i,
    .is-loading::before,
    .stat-card.is-loading .stat-value,
    .activity-item.is-loading,
    .event-item.is-loading,
    .connection-status-dot {
        animation: none;
    }
    
    .pulse {
        animation: none;
        opacity: 0.7;
    }
}

/* ===========================
   High Contrast Mode
   =========================== */
@media (prefers-contrast: high) {
    .error-state {
        background: #fee;
        border: 2px solid #f00;
    }
    
    .loading-state {
        background: #f0f0f0;
        border: 1px solid #ccc;
    }
    
    .empty-state {
        background: #f9f9f9;
        border: 1px solid #ddd;
    }
}

/* ===========================
   Dark Mode Support (Future)
   =========================== */
@media (prefers-color-scheme: dark) {
    .loading-state {
        background: #1a1a1a;
        color: #e5e5e5;
    }
    
    .error-state {
        background: #2d1b1b;
        border-color: #7f1d1d;
        color: #fca5a5;
    }
    
    .empty-state {
        background: #1a1a1a;
        color: #9ca3af;
    }
}

/* ===========================
   Print Styles
   =========================== */
@media print {
    .loading-state,
    .error-state,
    .update-status,
    .connection-status {
        display: none;
    }
}