/* 平板设备 (768px及以下) */
@media screen and (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 4rem;
    }

    .hero-content {
        margin-right: 0;
        margin-bottom: 2rem;
    }

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

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

    .modes-container {
        grid-template-columns: repeat(2, 1fr);
        padding: 0 1rem;
    }

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

/* 手机设备 (480px及以下) */
@media screen and (max-width: 480px) {
    .nav-container {
        padding: 0 1rem;
    }

    .logo img {
        height: 32px;
    }

    .nav-menu {
        gap: 1rem;
    }

    .hero {
        padding: 4rem 1rem 2rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .modes-container {
        grid-template-columns: 1fr;
    }

    .mode-card {
        padding: 1.5rem;
    }

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

    .footer {
        padding: 3rem 1rem 1.5rem;
    }
}

/* 超小屏幕设备 (320px及以下) */
@media screen and (max-width: 320px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .nav-menu {
        font-size: 0.9rem;
    }

    .mode-card h3 {
        font-size: 1.25rem;
    }
}