/* ===== 动态折叠导航（JS触发） ===== */
.navbar.nav-collapsed .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    gap: 20px;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
}

.navbar.nav-collapsed .nav-menu.active {
    display: flex;
}

.navbar.nav-collapsed .nav-menu li {
    width: 100%;
    border-bottom: 1px solid #f0f0f0;
}

.navbar.nav-collapsed .nav-menu li:last-child {
    border-bottom: none;
}

.navbar.nav-collapsed .nav-menu a {
    display: block;
    padding: 12px 0;
    font-size: 1rem;
}

.navbar.nav-collapsed .nav-toggle {
    display: flex;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .recycling-layout,
    .about-container,
    .platform-hero {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .recycling-image {
        height: 350px;
    }

    .recycling-process {
        grid-template-columns: repeat(2, 1fr);
    }

    .platform-feature-list {
        grid-template-columns: 1fr;
    }
}

/* 平板适配 - 导航菜单折叠 */
@media (max-width: 900px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px 30px;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        gap: 20px;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: 12px 0;
        font-size: 1rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .about-image {
        height: 300px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 15px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .recycling-process {
        grid-template-columns: 1fr;
    }

    .product-grid,
    .accessories-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 20px;
    }

    .product-image {
        height: 180px;
    }

    .recycling-content h2,
    .about-content h2 {
        font-size: 1.8rem;
    }

    .services,
    .products,
    .recycling,
    .accessories,
    .about,
    .contact,
    #software-platform {
        padding: 70px 20px;
    }

    .platform-hero-content h3 {
        font-size: 1.8rem;
    }

    .platform-tech {
        padding: 40px 20px;
    }

    .platform-tech-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.6rem;
    }

    .btn {
        padding: 12px 30px;
        font-size: 0.9rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .platform-grid {
        grid-template-columns: 1fr;
    }

    .platform-feature-list {
        grid-template-columns: 1fr;
    }

    .platform-tech-grid {
        grid-template-columns: 1fr;
    }
}