body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    color: #333;
    line-height: 1.6;
    background: linear-gradient(to bottom, #e8f7f0, #d4f0e6);
}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(76, 175, 80, 0.9);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}
header h1 {
    font-family: 'Roboto', sans-serif;
    color: white;
    font-size: 24px;
    margin: 0;
}
.nav-menu {
    display: flex;
    gap: 20px;
}
.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}
.nav-menu a:hover {
    color: #FFC107;
}
.menu-toggle {
    display: none;
    font-size: 24px;
    color: white;
    cursor: pointer;
}
.hero {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, 
                linear-gradient(to right, #4CAF50, #2196F3);
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
    position: relative;
}
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}
.hero h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 48px;
    z-index: 1;
    position: relative;
}
.hero p {
    font-size: 20px;
    z-index: 1;
    position: relative;
}
.section {
    padding: 50px 20px;
    background: linear-gradient(to bottom, #f0f9f4, #e0f3ea);
    position: relative;
}
.section:nth-child(even) {
    background: linear-gradient(to bottom, #e0f3ea, #f0f9f4);
}
.section h2 {
    font-family: 'Roboto', sans-serif;
    color: #4CAF50;
    font-size: 32px;
    margin-bottom: 20px;
}
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}
.card img {
    width: 100%;
    height: auto;
}
.card-content {
    padding: 15px;
    flex-grow: 1;
}
.card h3 {
    font-size: 20px;
    margin: 0 0 10px;
}
.card p {
    font-size: 14px;
    margin: 0;
}
.card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}
.button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-align: center;
}
.button:hover {
    background-color: #388E3C;
}
pre {
    background: #f4f4f4;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}
code {
    font-family: 'Courier New', monospace;
    font-size: 14px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}
th {
    background: #4CAF50;
    color: white;
}
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .hero h1 {
        font-size: 36px;
    }
    .hero p {
        font-size: 16px;
    }
    .section h2 {
        font-size: 28px;
    }
}