body {
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    overflow-x: hidden;
    max-width: 100vw;
}

nav {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav a {
    display: inline-block;
    color: white;
    text-decoration: none;
    padding: 12px 28px;
    margin: 0 8px;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
    letter-spacing: 0.5px;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

nav a.active {
    background-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Responsive design for mobile */
@media screen and (max-width: 600px) {
    nav {
        padding: 15px 0;
    }
    nav a {
        padding: 8px 16px;
        margin: 0 4px;
        font-size: 14px;
    }
}