/* 平板设备 (768px - 992px) */
@media (max-width: 991.98px) {
    .hero-section {
        padding: 60px 0;
    }

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

    .features-section {
        padding: 60px 0;
    }

    .features-section .row {
        margin-bottom: 40px;
    }
}

/* 手机设备 (< 768px) */
@media (max-width: 767.98px) {
    .hero-section {
        padding: 40px 0;
        text-align: center;
    }

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

    .hero-section .btn-group {
        justify-content: center;
    }

    .features-section {
        padding: 40px 0;
    }

    .features-section .row {
        margin-bottom: 30px;
    }

    .features-section img {
        margin-bottom: 20px;
    }

    .footer {
        padding: 40px 0;
        text-align: center;
    }
}

/* 小屏手机 (< 576px) */
@media (max-width: 575.98px) {
    .hero-section h1 {
        font-size: 1.75rem;
    }

    .hero-section .lead {
        font-size: 1rem;
    }

    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
}