body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    color: #333;
    background: linear-gradient(135deg, #f7f7f7, #e6e6e6);
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: #4567b7;
    color: white;
    padding: 10px 20px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header .logo {
    font-size: 24px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

header nav a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    font-size: 16px;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #ff9800;
}

.hero-section {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, 
                radial-gradient(circle, rgba(69, 103, 183, 0.8), rgba(255, 152, 0, 0.8));
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.hero-section h1 {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    font-size: 48px;
    z-index: 2;
    position: relative;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
}

.hero-section p {
    font-size: 18px;
    line-height: 1.6;
    z-index: 2;
    position: relative;
    max-width: 600px;
}

.content-section {
    padding: 60px 20px;
    background: #f7f7f7;
    color: #4567b7;
    position: relative;
    overflow: hidden;
}

.content-section h2 {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    font-size: 36px;
    text-align: center;
    margin-bottom: 20px;
    color: #4567b7;
}

.content-section p {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.code-block {
    background: #4567b7;
    color: white;
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    overflow-x: auto;
    margin: 20px 0;
}

.content-section img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.button {
    background: #4567b7;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.button:hover {
    background: #ff9800;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.privacy-tip {
    background: #f7f7f7;
    border-left: 5px solid #4567b7;
    padding: 10px;
    font-size: 14px;
    margin: 20px 0;
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 36px;
    }

    .content-section h2 {
        font-size: 30px;
    }

    .code-block {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    header .logo {
        font-size: 20px;
    }

    header nav a {
        font-size: 14px;
        margin-left: 10px;
    }

    .hero-section h1 {
        font-size: 28px;
    }

    .content-section h2 {
        font-size: 24px;
    }

    .code-block {
        font-size: 10px;
    }
}