body {
    font-family: 'Vazirmatn', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    text-align: center;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header {
    background: linear-gradient(135deg, #1f2c3a, #283a4d);
    color: white;
    padding: 20px 0;
    box-shadow: 0px 4px 15px rgba(0, 0, 0, 0.3);
}
nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}
nav ul li {
    display: inline;
    margin: 0 15px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}
main {
    padding: 40px;
    background: white;
    border-radius: 15px;
    box-shadow: 0px 6px 15px rgba(0, 0, 0, 0.15);
    width: 80%;
    margin: 40px auto;
    transition: all 0.3s ease-in-out;
}
main:hover {
    transform: scale(1.02);
}
footer {
    background: #222;
    color: white;
    padding: 15px 0;
    position: fixed;
    width: 100%;
    bottom: 0;
    box-shadow: 0px -4px 15px rgba(0, 0, 0, 0.3);
}