body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #E8F6EF, #C8E6C9);
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    background: radial-gradient(circle, #00539C, #0D47A1);
    color: white;
    padding: 20px 10px;
    text-align: center;
    position: relative;
    animation: header-glow 8s infinite alternate;
}

@keyframes header-glow {
    0% { background: radial-gradient(circle, #00539C, #0D47A1); }
    100% { background: radial-gradient(circle, #0D47A1, #00539C); }
}

h1 {
    font-size: 2.5rem;
    margin: 0;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 10px;
}

nav a {
    color: #FFD700;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

nav a:hover {
    color: white;
    text-shadow: 1px 1px 5px #FFD700;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 15px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

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

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.card-content {
    padding: 15px;
    text-align: center;
}

.card-title {
    font-size: 1.5rem;
    margin: 10px 0;
    color: #00539C;
}

.card-description {
    font-size: 1rem;
    color: #555;
}

article {
    background: linear-gradient(135deg, #E8F6EF, #FFFFFF);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

article h2 {
    color: #00539C;
    font-size: 2rem;
    margin-bottom: 15px;
}

article h3 {
    color: #0D47A1;
    font-size: 1.5rem;
    margin-top: 20px;
}

article code {
    background: #f4f4f4;
    padding: 2px 5px;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    color: #00539C;
}

pre {
    background: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
}

th {
    background: #00539C;
    color: white;
}

td {
    background: #f9f9f9;
}

.footer {
    background: linear-gradient(135deg, #00539C, #0D47A1);
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    nav { flex-direction: column; align-items: center; }
    .card img { height: 150px; }
}

@keyframes aurora-move {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.background-gradient {
    background: linear-gradient(to right, #E8F6EF, #00539C);
    transition: background 0.5s ease;
}

.background-gradient:hover {
    background: linear-gradient(to left, #FFD700, #00539C);
}