body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f6f8;
    color: #333;
}

header {
    background-color: #1e293b;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 3rem;
    text-align: center;
}

.container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
}

input {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    border: 1px solid #ccc;
}

button {
    width: 100%;
    padding: 0.8rem;
    margin-top: 1rem;
    border: none;
    background-color: #2563eb;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

button:hover {
    background-color: #1d4ed8;
}

.error {
    color: red;
    margin-top: 1rem;
}