* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background-color: #F9F9F9;
    color: #333;
}

header {
    background: #FFFFFF;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

#buy-now {
    background-color: #2BB673;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 50px auto;
    max-width: 1200px;
    text-align: center;
    background-image: url('https://www.oppo.com/content/dam/oppo/product-asset-library/assembled-page-asset/liehu/kv/overseas-kv-pc.jpg.thumb.webp');
}

.product-info {
    margin-bottom: 30px; 
}

.product-info h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.product-info h2 {
    font-size: 24px;
    margin-bottom: 20px;
}

.product-image img {
    width: 100%;
    max-width: 500px; 
}

footer {
    background: #FFFFFF;
    text-align: center;
    padding: 20px;
    box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.1);
}