/* ========================================
   解决方案卡片性能优化样式
   ======================================== */

/* 卡片loading状态 */
.solution-card.loading {
    pointer-events: none;
    opacity: 0.8;
    position: relative;
}

.solution-card.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(2px);
    border-radius: inherit;
    z-index: 10;
}

/* Loading 指示器 */
.card-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 11;
    color: var(--primary-blue);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 增强的卡片交互效果 */
.solution-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(59, 130, 246, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.solution-card:hover::before {
    opacity: 1;
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.15);
}

.solution-card:active {
    transform: translateY(-6px) scale(0.98);
}

/* 卡片图标优化 */
.solution-card .card-icon {
    transition: transform 0.3s ease;
}

.solution-card:hover .card-icon {
    transform: scale(1.1);
}

/* 预取状态指示器 */
.solution-card.prefetched::after {
    content: '';
    position: absolute;
    top: 12px;
    right: 12px;
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    z-index: 5;
    animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* 网络状态提示 */
.network-status {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 8px 16px;
    background: rgba(37, 99, 235, 0.9);
    color: white;
    border-radius: 4px;
    font-size: 14px;
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.network-status.show {
    transform: translateX(0);
}

.network-status.offline {
    background: rgba(239, 68, 68, 0.9);
}

.network-status.slow {
    background: rgba(245, 158, 11, 0.9);
}

/* 移动端优化 */
@media (max-width: 768px) {
    .solution-card {
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    
    .solution-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 8px 16px rgba(37, 99, 235, 0.1);
    }
    
    .loading-spinner {
        width: 28px;
        height: 28px;
    }
    
    .card-loader {
        backdrop-filter: blur(1px);
    }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
    .solution-card.loading::after {
        background: rgba(15, 23, 42, 0.9);
    }
    
    .solution-card::before {
        background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(99, 102, 241, 0.1));
    }
    
    .network-status {
        background: rgba(15, 23, 42, 0.9);
        border: 1px solid rgba(59, 130, 246, 0.3);
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .solution-card:hover {
        box-shadow: 0 0 0 2px var(--primary-blue);
    }
    
    .solution-card.loading::after {
        border: 2px solid var(--primary-blue);
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .solution-card,
    .card-icon,
    .loading-spinner,
    .card-loader {
        animation: none;
        transition: none;
    }
    
    .solution-card:hover {
        transform: none;
        box-shadow: 0 4px 8px rgba(37, 99, 235, 0.1);
    }
}