* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.header {
    width: 100%;
    padding: 20px 0;
    border-bottom: 1px solid #eee;
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 26px;
    font-weight: bold;
    color: #111;
}
.nav a {
    margin: 0 12px;
    color: #333;
    text-decoration: none;
}
.switch-bar select {
    margin-left: 8px;
    padding: 4px 6px;
}
.banner {
    width: 100%;
    padding: 80px 0;
    background-color: #f7f7f7;
    text-align: center;
}
.banner h1 {
    font-size: 36px;
    margin-bottom: 16px;
    color: #222;
}
.banner p {
    font-size: 18px;
    color: #555;
    margin-bottom: 30px;
}
.btn-inquiry {
    padding: 12px 32px;
    background: #0066cc;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
}
.product-preview {
    padding: 60px 0;
}
.product-preview h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 28px;
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.product-grid .item {
    padding: 30px 15px;
    border: 1px solid #eee;
    text-align: center;
}
.footer {
    width: 100%;
    padding: 30px 0;
    text-align: center;
    background: #222;
    color: #fff;
    font-size: 14px;
}