/* 响应式设计 - 现代扁平风格 */

@media (max-width: 992px) {
    .container {
        padding: 0 25px;
    }
    
    nav ul {
        gap: 25px;
    }
    
    .banner h1 {
        font-size: 42px;
    }
    
    .banner p {
        font-size: 18px;
    }
    
    .content-card {
        padding: 40px 30px;
    }
    
    .content-card h2 {
        font-size: 30px;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 20px;
        padding: 20px 0;
    }
    
    nav ul {
        flex-wrap: wrap;
        gap: 20px;
        justify-content: center;
    }
    
    .banner {
        padding: 60px 0;
    }
    
    .banner h1 {
        font-size: 32px;
    }
    
    .banner p {
        font-size: 16px;
    }
    
    .content-section {
        padding: 40px 0;
    }
    
    .content-card {
        padding: 30px 25px;
    }
    
    .content-card h2 {
        font-size: 26px;
    }
    
    .content-card h3 {
        font-size: 20px;
    }
    
    .grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    footer .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .banner {
        padding: 50px 0;
    }
    
    .banner h1 {
        font-size: 28px;
    }
    
    .content-card {
        padding: 25px 20px;
    }
    
    .content-card h2 {
        font-size: 24px;
    }
    
    .error-page h1 {
        font-size: 80px;
    }
    
    .error-page h2 {
        font-size: 24px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .card {
        padding: 25px 20px;
    }
}