body {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    background: url('https://images.gptkong.com/article/b/916_0.png') no-repeat center center fixed;
    background-size: cover;
    color: #333;
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: center;
    padding: 10px 0;
}

nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #B22222;
    font-weight: bold;
    transition: color 0.3s;
}
nav a:hover {
    color: #FF4500;
}

.container {
    max-width: 1200px;
    margin: 100px auto 50px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

section {
    margin-bottom: 40px;
    position: relative;
}

section::before {
    content: '';
    height: 2px;
    width: 50px;
    background: linear-gradient(90deg, #FF7F50, #FFD700);
    margin-bottom: 20px;
}

h2, h3 {
    color: #8B0000;
    position: relative;
}

h2::after, h3::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: #8B0000;
    margin-top: 5px;
}

p {
    font-size: 16px;
    color: #555;
}

img {
    max-width: 900px;
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s;
}
img:hover {
    transform: scale(1.05);
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    nav a {
        margin: 10px 0;
    }
}

@keyframes fall {
    0% { transform: translateY(-10px); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateY(500px); opacity: 0; }
}

.flower-petal {
    position: fixed;
    top: 0;
    width: 20px;
    height: 20px;
    background: url('https://images.gptkong.com/article/b/916_3.png') no-repeat center center / cover;
    opacity: 0.8;
    animation: fall 10s linear infinite;
}