*{
    box-sizing: border-box;
}
body{
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}
nav{
    background: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}
nav a{
    color: #fff;
    margin: 0 1rem;
    text-decoration:none;
}
main{
    padding: 2rem;
    max-width: 600px;
    margin: auto;
}
form label{
    display: block;
    margin-top: 1rem;
}
form input, form textarea{
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.25rem;
    border: 2px solid #ccc;
    border-radius: 20px;
}
button{
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    border: none;
    background: #686a6b;
    color: #ffffff;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s ease;
}
button:hover{
    background: #555;
}
.error{
    color: red;
    font-size: 0.9rem;
}
.success{
    color: green;
    margin-top: 1rem;
}
@media(max-width:600px){
    main{
        padding: 1rem;
    }
}