body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(to right, #eef2f3, #d9e7ff);
    color: #333;
    margin: 0;
}

.header {
    background: linear-gradient(135deg, #2563eb, #1e3a8a);
    color: white;
    text-align: center;
    padding: 40px;
}

.header h1 {
    font-size: 36px;
    font-weight: bold;
}

.header p {
    font-size: 18px;
}

.section {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.center {
    text-align: center;
}

.light-bg {
    background: #f4f7ff;
    padding: 40px;
    text-align: center;
}

.flex-box {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
    align-items: center;
}

.flex-box iframe {
    width: 100%;
    max-width: 500px;
    height: 300px;
    border-radius: 10px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.image-hover {
    width: 80%;
    max-width: 600px;
    border-radius: 10px;
    transition: transform 0.3s;
}

.image-hover:hover {
    transform: scale(1.05);
}

button {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 20px;
    margin: 5px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
}

.footer {
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    color: white;
    text-align: center;
    padding: 20px;
}

#result {
    margin-top: 15px;
    font-weight: bold;
}