:root {
    --main-color: #3A8DFF;
    --accent-color: #4473FF;
    --bg-color: #F7FAFF;
    --text-color: #222;
    --section-padding: 48px 0;
    --radius: 12px;
}
* { box-sizing: border-box; }
body {
    margin: 0; font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color); color: var(--text-color);
}
a { color: var(--main-color); text-decoration: none; margin: 0 8px;}
header {
    background: #fff; box-shadow: 0 2px 8px rgba(58, 141, 255, .05);
    position: sticky; top: 0; z-index: 10;
}
.header-bar {
    display: flex; align-items: center; justify-content: space-between; padding: 0 24px; height: 64px;
}
.logo { height: 40px; border-radius: 8px; }
.site-title { font-size: 1.5em; font-weight: 600; color: var(--main-color); margin-left: 12px;}
nav { flex: 1; text-align: right;}
nav a { font-size: 1em; padding: 0 8px;}
.banner {
    background: linear-gradient(90deg, #4473FF 40%, #3A8DFF 100%);
    color: #fff; padding: 56px 0 40px 0; text-align: center;
}
.banner h1 { font-size: 2.6em; margin-bottom: 16px;}
.banner p { font-size: 1.2em;}
.section { padding: var(--section-padding);}
.container { width: 95%; max-width: 1080px; margin: 0 auto;}
.services-list {
    display: flex; flex-wrap: wrap; gap: 32px; justify-content: center; margin-top: 24px;
}
.service-item {
    background: #fff; border-radius: var(--radius); box-shadow: 0 2px 12px rgba(58, 141, 255, 0.06);
    flex: 1 1 200px; min-width: 220px; max-width: 260px; padding: 28px 16px; text-align: center;
}
.service-item img { width: 80px; margin-bottom: 16px;}
.service-item h3 { color: var(--main-color);}
.advantages-list {
    display: flex; flex-wrap: wrap; gap: 28px; margin-top: 20px; justify-content: center;
}
.advantage-item {
    background: #fff; border-radius: var(--radius); box-shadow: 0 2px 12px rgba(58, 141, 255, 0.08);
    flex: 1 1 180px; min-width: 180px; max-width: 250px; padding: 24px 12px;
}
.advantage-item h4 { color: var(--accent-color);}
.faq-list {
    margin-top: 16px; display: flex; flex-wrap: wrap; gap: 16px;
}
.faq-item {
    background: #fff; border-radius: var(--radius); box-shadow: 0 1px 6px rgba(58, 141, 255, 0.06);
    flex: 1 1 300px; min-width: 240px; max-width: 420px; padding: 20px 16px;
}
.faq-item h5 { margin: 0 0 8px 0; color: var(--main-color);}
.contact-grid {
    display: flex; flex-wrap: wrap; gap: 36px; align-items: flex-start;
}
.contact ul { padding-left: 0; list-style: none; }
.contact li { margin-bottom: 6px; }
.wechat-qr { width: 100px; border-radius: 10px; margin-top: 8px;}
.contact-form {
    background: #fff; border-radius: var(--radius); box-shadow: 0 1px 6px rgba(58, 141, 255, 0.07);
    padding: 22px 18px; min-width: 260px; flex: 1 1 320px;
    display: flex; flex-direction: column; gap: 12px;
}
.contact-form input, .contact-form textarea {
    width: 100%; padding: 8px; border: 1px solid #dde8f2; border-radius: 6px;
    font-size: 1em; resize: none;
}
.contact-form button {
    background: var(--main-color); color: #fff; border: none; border-radius: 6px;
    padding: 10px 0; font-size: 1em; font-weight: bold; cursor: pointer;
    transition: background .18s;
}
.contact-form button:hover { background: var(--accent-color);}
footer {
    background: #232b39; color: #fff; text-align: center; padding: 18px 0; font-size: .96em;
    margin-top: 32px;
    letter-spacing: 0.5px;
}
@media (max-width: 900px) {
    .services-list, .advantages-list, .faq-list, .contact-grid {
        flex-direction: column; gap: 18px;
    }
    .service-item, .advantage-item, .faq-item, .contact-form { max-width: 100%; min-width: 0;}
    .banner h1 { font-size: 2em;}
}