body {
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f9fbfd;
    color: #1e293b;
    line-height: 1.6;
}

* {
    box-sizing: border-box;
}

.header {
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
    padding: 20px 20px;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
}

.header h1 {
    font-size: 32px;
    margin-bottom: 8px;
    color: #1d4ed8;
}

.header p {
    color: #64748b;
    font-size: 20pt;
    margin-bottom: 24px;
    text-align: center;
}

.showcase {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    max-width: 960px;
    margin: 0 auto;
}

.product {
    background: white;
    border-radius: 12px;
    padding: 24px;
    width: 320px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.product h2 {
    font-size: 19px;
    color: #2563eb;
    margin-bottom: 12px;
}

.product p {
    font-size: 14px;
    color: #475569;
    margin-bottom: 12px;
}

.demo-link {
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
}

.demo-link:hover {
    text-decoration: underline;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
    display: flex;
    gap: 28px;
}

.left {
    flex: 0 0 35%;
    background: white;
    padding: 28px;
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
}

.right {
    flex: 0 0 65%;
}

.section {
    margin-bottom: 26px;
}

h2 {
    font-size: 19px;
    font-weight: 600;
    color: #1d4ed8;
    margin: 22px 0 14px 0;
    padding-bottom: 6px;
    border-bottom: 2px solid #dbeafe;
}

.contact-info {
    font-size: 14px;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 24px;
}

ul {
    padding-left: 22px;
    margin: 8px 0 16px;
}

li {
    margin-bottom: 7px;
    position: relative;
}

li::before {
    content: "•";
    color: #2563eb;
    position: absolute;
    left: -16px;
}

p {
    margin-bottom: 10px;
    text-align: justify;
}

.highlight {
    background: #dbeafe;
    color: #1d4ed8;
    padding: 0 4px;
    border-radius: 3px;
    font-weight: 600;
}

@media (max-width: 900px) {
    .header {
        padding: 32px 0px;
    }

    .header h1 {
        font-size: 28px;
    }

    .header p {
        font-size: 15px;
    }

    .container {
        flex-direction: column;
        margin: 32px auto;
    }

    .left,
    .right {
        flex: 1 1 auto;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 15px;
    }

    .showcase {
        flex-direction: column;
        gap: 18px;
        padding: 0 16px;

    }

    .product {
        width: 100%;
        padding: 18px;
    }

    .product h2 {
        font-size: 18px;
    }

    .header p {
        font-size: 14px;
        line-height: 1.5;
    }

    .container {
        margin: 24px auto;
        padding: 0 16px;
        gap: 18px;
    }

    .left,
    .right {
        padding: 20px;
    }

    h2 {
        font-size: 18px;
    }

    ul {
        padding-left: 18px;
    }
}