* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    font-family: Arial, Helvetica, sans-serif;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    max-width: 100%;
    display: block;
}
:root { --primary-red: #c02d2d; --text-dark: #333; --text-gray: #666; --white: #ffffff; }
body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    color: #333;
    line-height: 1.5;
}

.top-bar { background: #f4f4f4; padding: 5px 10%; display: flex; justify-content: flex-end; gap: 20px; font-size: 12px; }
header { padding: 10px 10%; display: flex; align-items: center; justify-content: space-between; border-bottom: 2px solid #eee; }
.logo { font-weight: bold; font-size: 24px; color: #333; }
.nav { display: flex; gap: 25px; font-size: 14px; font-weight: bold; }
.nav a { text-decoration: none; color: #333; }
.nav a.active { color: var(--primary-red); }
.search-box { border: 1px solid #ccc; padding: 3px; display: flex; align-items: center; }

.hero { height: 500px; background: #333; display: flex; align-items: center; justify-content: center; color: white; text-align: center; }

.section-padding { padding: 60px 10%; }
.section-title { text-align: center; margin-bottom: 40px; font-size: 24px; }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-bottom: 80px; align-items: center; }
.product-card {
    border: 1px solid #eee;
    padding: 15px;
    text-align: center;
    width: 200px;
    height: 180px;
}


.cta-section { background: #222; color: #fff; padding: 60px 10%; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }

.news-cert-section { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; padding: 60px 10%; }
.cert-items { display: flex; gap: 20px; }

footer { background: #222; color: #fff; padding: 40px 10%; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; font-size: 12px; }
footer h4 { margin-top: 0; color: #fff; }
.footer-social { display: flex; gap: 5px; margin-top: 10px; }
.footer-social span { width: 25px; height: 25px; background: #666; display: inline-block; }

/* 移动端适配 */
@media (max-width:768px){
    .top-bar{ flex-direction:column; justify-content:center; text-align:center; }
    header{ flex-direction:column; gap:15px; }
    .nav{ flex-wrap:wrap; justify-content:center; }
    .hero{ height:auto; padding:60px 5%; }
    .product-grid{ grid-template-columns:1fr; }
    .cta-section{ grid-template-columns:1fr; }
    .news-cert-section{ grid-template-columns:1fr; }
    footer{ grid-template-columns:1fr; }
}