/**
 * 性能优化CSS
 * 包含骨架屏、加载动画、优化样式等
 */

/* 骨架屏动画 */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

@keyframes skeleton-fade {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 骨架屏组件 */
.skeleton-container {
    position: relative;
    overflow: hidden;
    background-color: var(--gray-100);
    border-radius: var(--radius-md);
}

.skeleton {
    background: linear-gradient(90deg, 
        var(--gray-100) 25%, 
        var(--gray-200) 50%, 
        var(--gray-100) 75%);
    background-size: 200% 100%;
    animation: skeleton-wave 1.5s ease-in-out infinite;
}

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

.skeleton-rect {
    height: 20px;
    border-radius: var(--radius-sm);
}

.skeleton-rect-lg {
    height: 32px;
    border-radius: var(--radius-md);
}

.skeleton-rect-xl {
    height: 48px;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.skeleton-text:last-child {
    margin-bottom: 0;
}

.skeleton-text-sm {
    height: 12px;
    width: 60%;
}

.skeleton-text-md {
    height: 16px;
    width: 80%;
}

.skeleton-text-lg {
    height: 20px;
    width: 100%;
}

/* 卡片骨架屏 */
.skeleton-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.skeleton-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.skeleton-card-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skeleton-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

/* 表格骨架屏 */
.skeleton-table {
    width: 100%;
    border-collapse: collapse;
}

.skeleton-table thead tr {
    border-bottom: 2px solid var(--gray-200);
}

.skeleton-table th {
    padding: 1rem;
    text-align: left;
    font-weight: var(--font-semibold);
    color: var(--gray-600);
}

.skeleton-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-100);
}

.skeleton-table-row {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--gray-100);
}

.skeleton-table-cell {
    flex: 1;
    margin-right: 1rem;
}

.skeleton-table-cell:last-child {
    margin-right: 0;
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: none; /* 默认隐藏 */
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

/* 显示状态的加载覆盖层 */
.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spinner-rotate 1s linear infinite;
}

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

.loading-dots {
    display: flex;
    gap: 4px;
    margin-top: 1rem;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-600);
    animation: dots-bounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes dots-bounce {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 渐进式加载 */
.progressive-load {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.progressive-load.loaded {
    opacity: 1;
    transform: translateY(0);
}

.progressive-load-delay-1 {
    transition-delay: 0.1s;
}

.progressive-load-delay-2 {
    transition-delay: 0.2s;
}

.progressive-load-delay-3 {
    transition-delay: 0.3s;
}

.progressive-load-delay-4 {
    transition-delay: 0.4s;
}

/* 懒加载图片样式 */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-image.loaded {
    opacity: 1;
}

.lazy-image.placeholder {
    background: linear-gradient(90deg, 
        var(--gray-100) 25%, 
        var(--gray-200) 50%, 
        var(--gray-100) 75%);
    background-size: 200% 100%;
    animation: skeleton-wave 1.5s ease-in-out infinite;
}

/* 视差滚动效果 */
.parallax-container {
    position: relative;
    overflow: hidden;
}

.parallax-layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    will-change: transform;
}

.parallax-bg {
    transform: translateZ(-1px) scale(2);
    z-index: -1;
}

.parallax-fg {
    transform: translateZ(1px) scale(0.8);
    z-index: 1;
}

/* 滚动优化 */
.scroll-optimized {
    will-change: transform;
    contain: content;
}

.optimized-scroll-container {
    -webkit-overflow-scrolling: touch;
    overflow-y: auto;
    overscroll-behavior: contain;
}

/* 字体加载优化 */
.font-loading {
    font-family: system-ui, -apple-system, sans-serif;
    font-display: swap;
}

.font-loaded {
    font-family: var(--font-family), system-ui, -apple-system, sans-serif;
}

/* 减少动画性能消耗的属性 */
.optimized-animation {
    will-change: transform, opacity;
    backface-visibility: hidden;
    -webkit-font-smoothing: antialiased;
    transform: translateZ(0);
}

/* 触摸反馈优化 */
.touch-optimized {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.touch-feedback {
    transition: transform 0.1s ease, background-color 0.1s ease;
}

.touch-feedback:active {
    transform: scale(0.98);
}

/* 减少布局抖动 */
.layout-stable {
    contain: layout style paint;
}

/* 图片优化类 */
.optimized-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

.webp-image {
    background-image: image-set(
        url('image.webp') type('image/webp'),
        url('image.jpg') type('image/jpeg')
    );
}

/* 响应式图片容器 */
.responsive-image-container {
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 比例 */
}

.responsive-image-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 性能监控样式 */
.performance-warning {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--warning-50);
    border: 1px solid var(--warning-300);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 0.875rem;
    z-index: 10000;
    max-width: 300px;
    box-shadow: var(--shadow-lg);
    animation: slide-in-right 0.3s ease;
}

@keyframes slide-in-right {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.performance-warning-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--warning-700);
    font-weight: var(--font-semibold);
}

.performance-warning-content {
    color: var(--gray-700);
    line-height: 1.4;
}

/* 网络状态指示器 */
.network-status {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: var(--font-semibold);
    z-index: 10000;
    transition: all var(--transition-normal);
    animation: fade-in 0.3s ease;
}

.network-status.online {
    background: var(--success-100);
    color: var(--success-700);
    border: 1px solid var(--success-300);
}

.network-status.offline {
    background: var(--error-100);
    color: var(--error-700);
    border: 1px solid var(--error-300);
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 内存使用指示器 */
.memory-indicator {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    z-index: 10000;
    backdrop-filter: blur(4px);
    display: none; /* 默认隐藏，通过JS控制 */
}

.memory-indicator.low {
    background: rgba(239, 68, 68, 0.8);
}

.memory-indicator.medium {
    background: rgba(245, 158, 11, 0.8);
}

.memory-indicator.high {
    background: rgba(16, 185, 129, 0.8);
}

/* 帧率监控 */
.fps-indicator {
    position: fixed;
    top: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    z-index: 10000;
    backdrop-filter: blur(4px);
    display: none; /* 默认隐藏，通过JS控制 */
}

.fps-indicator.low {
    color: #f87171;
}

.fps-indicator.medium {
    color: #fbbf24;
}

.fps-indicator.high {
    color: #34d399;
}

/* 打印优化 */
@media print {
    .no-print {
        display: none !important;
    }
    
    .print-optimized {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .print-full-width {
        width: 100% !important;
        max-width: 100% !important;
    }
}

/* 深色模式优化 */
@media (prefers-color-scheme: dark) {
    .skeleton-container {
        background-color: var(--gray-800);
    }
    
    .skeleton {
        background: linear-gradient(90deg, 
            var(--gray-800) 25%, 
            var(--gray-700) 50%, 
            var(--gray-800) 75%);
    }
    
    .loading-overlay {
        background: rgba(0, 0, 0, 0.9);
    }
    
    .loading-spinner {
        border-color: var(--gray-700);
        border-top-color: var(--primary-400);
    }
    
    .lazy-image.placeholder {
        background: linear-gradient(90deg, 
            var(--gray-800) 25%, 
            var(--gray-700) 50%, 
            var(--gray-800) 75%);
    }
}

/* 减少动画（适用于用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .skeleton {
        animation: none;
    }
    
    .loading-spinner {
        animation: none;
        border-top-color: transparent;
    }
    
    .loading-dots span {
        animation: none;
    }
}

/* 高对比度模式优化 */
@media (prefers-contrast: high) {
    .skeleton-container {
        background-color: black;
    }
    
    .skeleton {
        background: linear-gradient(90deg, 
            black 25%, 
            #333 50%, 
            black 75%);
    }
    
    .loading-overlay {
        background: white;
    }
}

/* 数据保存模式 */
@media (prefers-reduced-data: reduce) {
    .background-image {
        background-image: none !important;
    }
    
    .lazy-image {
        display: none;
    }
    
    .skeleton {
        animation: none;
    }
}