/* 平板设备 (最大宽度 1024px) */
@media (max-width: 768px) {
    :root {
        --container-width: 900px;
    }
    
    .features-grid,
    .dex-features-grid,
    .download-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .news-item {
        grid-template-columns: 200px 1fr;
    }
}

/* 平板/移动端 (最大宽度 768px) */
@media (max-width: 768px) {
    :root {
        --container-width: 100%;
        --header-height: 70px;
        --font-size-base: 15px;
        --font-size-xl: 20px;
        --font-size-2xl: 24px;
    }
    
    /* 移动端菜单 */
    .menu-toggle {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: white;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        padding: 1rem 0;
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 998;
    }
    
    .main-nav.active {
        transform: translateY(0);
    }
    
    .main-nav ul {
        flex-direction: column;
        padding: 0 var(--gutter);
        gap: 1rem;
    }
    
    .main-nav a {
        display: block;
        padding: 0.75rem 0;
    }
    
    /* 布局调整 */
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .features-grid,
    .dex-features-grid,
    .download-options,
    .footer-top {
        grid-template-columns: 1fr;
    }
    
    .tutorial-content,
    .news-content {
        grid-template-columns: 1fr;
    }
    
    .sidebar-menu {
        position: static;
        margin-bottom: 2rem;
    }
    
    .news-item {
        grid-template-columns: 1fr;
    }
    
    .news-img {
        height: 200px;
    }
    
    /* 下载卡片调整 */
    .download-card {
        margin-bottom: 2rem;
    }
    
    /* 页脚调整 */
    .footer-top {
        gap: 2rem;
    }
}

/* 小屏移动端 (最大宽度 480px) */
@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --gutter: 15px;
    }
    
    .main-content {
        padding: 2rem 0;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: 10px 16px;
        width: 100%;
    }
    
    .verification-steps li {
        padding-left: 2.5rem;
    }
    
    .verification-steps li::before {
        width: 1.5rem;
        height: 1.5rem;
        font-size: var(--font-size-sm);
    }
    
    .tutorial-step,
    .download-guide,
    .download-verification,
    .download-faq {
        padding: 1.5rem 1rem;
    }
}