/* 响应式样式文件 */

/* 移动设备优先的断点系统 */

/* 超小屏幕 (手机, < 640px) */
@media (max-width: 640px) {
    .container {
        padding: 0 1rem;
        max-width: 100%;
    }
    
    .hero-section h1 {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-section p {
        font-size: 1.1rem;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .navigation {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-item {
        margin: 0.5rem 0;
    }
    
    .content-section {
        padding: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}

/* 小屏幕 (平板, 641px - 768px) */
@media (min-width: 641px) and (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
        max-width: 100%;
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .navigation {
        flex-direction: row;
        justify-content: space-around;
    }
}

/* 中等屏幕 (小桌面, 769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 90%;
        margin: 0 auto;
    }
    
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
    
    .hero-section {
        padding: 3rem 0;
    }
}

/* 大屏幕 (桌面, 1025px - 1280px) */
@media (min-width: 1025px) and (max-width: 1280px) {
    .container {
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .product-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }
}

/* 超大屏幕 (> 1280px) */
@media (min-width: 1281px) {
    .container {
        max-width: 1400px;
        margin: 0 auto;
    }
    
    .product-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 2rem;
    }
}

/* 通用移动优化 */
@media (max-width: 768px) {
    /* 文本优化 */
    h1, h2, h3 {
        line-height: 1.3;
        margin-bottom: 1rem;
    }
    
    /* 按钮优化 */
    .btn {
        display: block;
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    /* 表单优化 */
    input, textarea, select {
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    /* 图片优化 */
    img {
        max-width: 100%;
        height: auto;
    }
    
    /* 隐藏不必要的元素 */
    .desktop-only {
        display: none;
    }
    
    /* 显示移动专用元素 */
    .mobile-only {
        display: block;
    }
}

/* 平板优化 */
@media (min-width: 641px) and (max-width: 1024px) {
    .tablet-optimized {
        display: block;
    }
    
    .desktop-only {
        display: none;
    }
}

/* 横屏手机优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-section {
        padding: 2rem 0;
        min-height: 60vh;
    }
    
    .navigation {
        flex-direction: row;
        justify-content: space-around;
    }
}

/* 高DPI屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo {
        background-image: url('../images/logo@2x.png');
        background-size: contain;
    }
}

/* 打印样式 */
@media print {
    .navbar, .footer, .btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
        line-height: 1.4;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    .container {
        max-width: 100%;
        margin: 0;
        padding: 0;
    }
}