/* ============================================
   响应式设计
   ============================================ */

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .pricing-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* 移动设备 (最大768px) */
@media (max-width: 768px) {
    /* 导航栏 */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 2rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    /* Hero Section */
    .hero {
        min-height: 80vh;
        padding-top: 70px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    /* Section */
    section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    /* 功能模块 */
    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 2rem;
    }

    /* 使用方法 */
    .usage-steps {
        grid-template-columns: 1fr;
    }

    .step-item {
        flex-direction: column;
        text-align: center;
    }

    .usage-features {
        grid-template-columns: 1fr;
    }

    /* 价格方案 */
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    /* 技术优势 */
    .tech-grid {
        grid-template-columns: 1fr;
    }

    /* 客户案例 */
    .cases-grid {
        grid-template-columns: 1fr;
    }

    /* 联系我们 */
    .contact-content {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    /* 页脚 */
    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* 小屏移动设备 (最大480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .advantage-item,
    .feature-card,
    .pricing-card,
    .case-item {
        padding: 1.5rem;
    }

    .contact-form {
        padding: 1.5rem;
    }
}

/* 超小屏设备 (最大360px) */
@media (max-width: 360px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}