body {
        font-family: Arial, sans-serif;
        margin: 0;
        padding: 0;
        color: #333;
        line-height: 1.55;
        font-size: 17px;
    }

    h1, h2, h3 { font-weight: 700; }

    .container {
        width: 90%;
        max-width: 1200px;
        margin: auto;
    }

    .btn {
        display: inline-block;
        padding: 10px 24px;
        background: #007bff;
        color: #fff;
        text-decoration: none;
        border-radius: 6px;
        font-size: 16px;
    }

    section {
        padding: 22px 0;
    }

    .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 14px;
    }

    .card {
        border: 1px solid #ddd;
        border-radius: 8px;
        padding: 14px;
        background: #fff;
    }

    .card h3 {
        margin-top: 0;
        margin-bottom: 8px;
        font-size: 19px;
    }

    ul li {
        margin-bottom: 4px;
    }

    .faq-item {
        margin-bottom: 10px;
    }

    /* HERO */
    .hero {
        background: url('https://sc04.alicdn.com/kf/Hd76ac04378de4aa19c15737a1d5a4208H/231080991/Hd76ac04378de4aa19c15737a1d5a4208H.jpg')
                    center/cover no-repeat;
        height: 440px;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0 20px;
    }

    .hero-overlay {
        position: absolute;
        inset: 0;
        background: rgba(0,0,0,0.35);
    }

    .hero-content {
        position: relative;
        z-index: 2;
        text-align: center;
        color: #fff;
        max-width: 900px;
    }

    .hero h1 {
        font-size: 36px;
        margin-bottom: 10px;
    }

    .hero h2 {
        font-size: 20px;
        margin-bottom: 18px;
    }

    /* 移动端优化 */
    @media(max-width: 768px) {
        body { font-size: 17.5px; }

        .hero {
            height: 320px;
        }
        .hero h1 { font-size: 24px; }
        .hero h2 { font-size: 15px; }

        .grid {
            grid-template-columns: 1fr !important;
        }

        section {
            padding: 18px 0;
        }
    }