body {
    margin: 0;
    font-family: 'San Francisco', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(to bottom, #F5F5F5, #E0E0E0);
    color: #333333;
    line-height: 1.6;
    padding: 20px;
    overflow-x: hidden;
}
h1, h2, h3 {
    color: #007AFF;
    text-align: center;
    margin-top: 40px;
    margin-bottom: 20px;
}
p {
    font-size: 18px;
    margin: 10px 0;
    line-height: 1.8;
}
.container {
    max-width: 1200px;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}
.hero {
    background: url('https://images.gptkong.com/product/iphone16/iphone16-1.png') no-repeat center center/cover;
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.hero h1 {
    font-size: 48px;
    color: white;
}
.hero p {
    font-size: 24px;
}
.features {
    background-color: #FFFFFF;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.feature-item {
    text-align: center;
    padding: 20px;
    border: 1px solid #C0C0C0;
    border-radius: 10px;
    transition: transform 0.3s ease-in-out;
}
.feature-item:hover {
    transform: scale(1.05);
}
.feature-item img {
    width: 100px;
    height: auto;
    margin-bottom: 20px;
}
.cta-button {
    display: inline-block;
    background-color: #007AFF;
    color: white;
    padding: 15px 30px;
    font-size: 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
    transition: background-color 0.3s ease-in-out;
}
.cta-button:hover {
    background-color: #005bb5;
}
@media (max-width: 768px) {
    .hero {
        height: 300px;
    }
    .hero h1 {
        font-size: 36px;
    }
    .hero p {
        font-size: 18px;
    }
    .container {
        grid-template-columns: 1fr;
    }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1025px) {
    .container {
        grid-template-columns: repeat(3, 1fr);
    }
}
.marketing-article {
    background-color: #FFFFFF;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-top: 40px;
}
.marketing-article h2, .marketing-article h3 {
    color: #007AFF;
}
.marketing-article p {
    text-indent: 2em;
}