@media screen and (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        height: calc(100vh - 70px);
        padding-top: 50px;
        order: 3;
    }

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

    .nav-menu li {
        margin: 25px 0;
    }

    .language-selector {
        margin-left: 0;
        margin-right: 20px;
    }

    .nav-toggle {
        display: flex;
        order: 2;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .page-header h1 {
        font-size: 2.5rem;
        padding: 0 20px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content p {
        font-size: 1.1rem;
        padding: 0 20px;
    }

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

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

    .contact-info {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

    .service-item {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .service-item.reverse .service-image,
    .service-item.reverse .service-content {
        order: initial;
    }

    /* 多语言字体大小调整 */
    body.lang-ko .hero-content h1 {
        font-size: 2.2rem;
    }

    body.lang-ko .page-header h1 {
        font-size: 2.2rem;
    }

    body.lang-en .hero-content h1 {
        font-size: 2.3rem;
    }

    body.lang-zh .hero-content h1 {
        font-size: 2.5rem;
    }
}

@media screen and (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
        padding: 0 30px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .container {
        padding: 0 15px;
    }

    .about-preview,
    .services-preview,
    .contact-preview,
    .about-detail,
    .services-detail,
    .contact-detail {
        padding: 50px 0;
    }

    .service-card {
        padding: 20px;
    }

    .service-item {
        padding: 20px;
        margin-bottom: 40px;
    }

    .contact-item-detail {
        margin-bottom: 30px;
        padding: 15px 0;
    }

    .form-group input,
    .form-group textarea {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .language-selector select {
        padding: 6px 8px;
        font-size: 12px;
    }

    /* 小屏幕多语言字体调整 */
    body.lang-ko {
        font-size: 0.9rem;
    }

    body.lang-ko .hero-content h1 {
        font-size: 1.8rem;
        line-height: 1.2;
    }

    body.lang-ko .page-header h1 {
        font-size: 1.8rem;
    }

    body.lang-en .hero-content p {
        font-size: 0.95rem;
    }
}

/* 高分辨率屏幕调整 */
@media screen and (min-width: 1400px) {
    .container {
        max-width: 1300px;
    }

    .hero-content h1 {
        font-size: 4rem;
    }

    .hero-content p {
        font-size: 1.4rem;
    }

    body.lang-ko .hero-content h1 {
        font-size: 3.5rem;
    }

    body.lang-en .hero-content h1 {
        font-size: 4.2rem;
    }
}