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

body, html {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #a7ffeb, #64ffda);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Navigation Bar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.navbar .logo {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.navbar .menu {
    display: flex;
    gap: 20px;
}

.navbar .menu a {
    text-decoration: none;
    color: #333;
    transition: color 0.3s ease;
}

.navbar .menu a:hover {
    color: #64ffda;
}

/* Hero Section */
.hero {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png'), linear-gradient(135deg, #a7ffeb, #64ffda);
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero button {
    background: #64ffda;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    color: #fff;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.hero button:hover {
    transform: scale(1.05);
    background-color: #00bfa5;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 60px 20px;
    background: #f9f9f9;
}

.feature-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.feature-card img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: #666;
}

/* Article Section */
.article {
    padding: 40px 20px;
    background: #fff;
}

.article h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 20px;
}

.article p, .article ul, .article pre {
    margin-bottom: 20px;
}

.article pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
}

/* Footer */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar .menu {
        flex-direction: column;
        gap: 10px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 28px;
    }

    .features {
        grid-template-columns: 1fr;
    }
}