:root {
    --primary-color: #2374a8;
    --secondary-color: #1a364d;
}
body {
    font-family: 'Microsoft YaHei', sans-serif;
}
.navbar {
    background-color: var(--primary-color);
}
.navbar-brand, .nav-link {
    color: white !important;
}
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://via.placeholder.com/1920x600') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 120px 0;
    text-align: center;
}
.product-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s;
    margin-bottom: 30px;
    overflow: hidden;
}
.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}
.product-img {
    height: 200px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f8f9fa;
}
.product-img img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
}
.product-title {
    color: var(--primary-color);
    font-weight: bold;
}
.tech-badge {
    background-color: var(--secondary-color);
    color: white;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    margin-right: 5px;
    display: inline-block;
    margin-bottom: 5px;
}
.tech-badge:hover {
    font-weight: 600;
    border: solid var(--secondary-color) 2px;
    background-color: white;
    color: var(--secondary-color);
}
.section-title {
    position: relative;
    margin-bottom: 50px;
    font-weight: 700;
    color: var(--secondary-color);
}
.section-title:after {
    content: "";
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 15px auto 0;
}
.feature-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}
.contact-section {
    background-color: #f8f9fa;
}
footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 30px 0;
}
.img-w280 {
    width: 280px;
    margin-right: 20px;
}
.img-w270 {
    width: 270px;
    margin: 10px;
}
.img-w130 {
    width: 130px;
    margin: 5px;
}
.mb_20 {
    margin-bottom: 20px;
}

.nav-link {
    color: #6c757d;
    font-family: "Merriweather Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    font-weight: 600;
    font-size: large;
    padding: 0.75rem 0;
}