body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f6fb;
    color: #222;
}
.main-header {
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.banner {
    background: url('images/banner.jpg') center/cover no-repeat;
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.banner::after {
    content: '';
    position: absolute;
    left: 0; top: 0; right: 0; bottom: 0;
    background: rgba(26,35,126,0.55);
}
.banner-content {
    position: relative;
    z-index: 1;
    color: #fff;
    text-align: center;
}
.banner-content h1 {
    font-size: 2.8em;
    margin-bottom: 12px;
    letter-spacing: 2px;
}
.slogan {
    font-size: 1.5em;
    font-weight: 400;
    margin-bottom: 0;
    letter-spacing: 1px;
}
nav {
    background: #1a237e;
}
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 40px;
    justify-content: center;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 1.15em;
    padding: 18px 0;
    display: block;
    transition: color 0.2s;
}
nav ul li a:hover {
    color: #ffb300;
}
.container, main {
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
    box-sizing: border-box;
}
.big-section {
    margin-bottom: 48px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(26,35,126,0.06);
    padding: 40px 36px;
}
section h2 {
    margin-top: 0;
    color: #1a237e;
    font-size: 2em;
    letter-spacing: 1px;
}
.advantage-list {
    display: flex;
    gap: 36px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.advantage-item {
    flex: 1 1 220px;
    background: #e3eafc;
    border-radius: 8px;
    padding: 24px 18px;
    text-align: center;
    box-shadow: 0 1px 4px rgba(26,35,126,0.04);
}
.product-list {
    display: flex;
    gap: 36px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.product-card {
    flex: 1 1 420px;
    background: #f1f8e9;
    border-radius: 8px;
    padding: 28px 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.03);
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
.product-card img {
    display: block;
    margin: 0 auto 12px auto;
    align-self: center;
}
.product-card h3 {
    text-align: center;
    width: 100%;
    margin-top: 0;
    margin-bottom: 12px;
}
.product-card p {
    margin: 0 0 12px 0;
    line-height: 1.8;
    color: #333;
    text-align: left;
}
.product-features {
    padding-left: 18px;
    margin-bottom: 12px;
    color: #444;
    font-size: 1em;
}
.product-features li {
    margin-bottom: 6px;
    line-height: 1.7;
}
.gallery .images {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin-top: 18px;
    justify-content: space-between;
}
.gallery .images img {
    width: 260px;
    height: 160px;
    object-fit: cover;
    border-radius: 8px;
    background: #e0e0e0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.contact-info {
    font-size: 1.15em;
    line-height: 2;
}
footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 22px 0;
    margin-top: 60px;
    font-size: 1em;
    letter-spacing: 1px;
}
.product-link {
    display: inline-block;
    margin-top: 16px;
    padding: 8px 22px;
    background: #1a237e;
    color: #fff;
    border-radius: 6px;
    text-decoration: none;
    font-size: 1em;
    transition: background 0.2s;
    align-self: center;
}
.product-link:hover {
    background: #3949ab;
}
@media (max-width: 900px) {
    .big-section, main {
        padding-left: 10px;
        padding-right: 10px;
    }
    .advantage-list, .product-list, .gallery .images {
        flex-direction: column;
        gap: 18px;
    }
    .banner-content h1 {
        font-size: 2em;
    }
    .slogan {
        font-size: 1.1em;
    }
}