* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

header {
    background: rgba(0,0,0,0.25);
    color: white;
    padding: 20px;
    text-align: center;
}

.container {
    background: white;
    width: 420px;
    margin: 40px auto;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.25);
}

label {
    display: block;
    margin-top: 10px;
}

input {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
}

button {
    margin-top: 20px;
    width: 100%;
    padding: 10px;
    background: #667eea;
    border: none;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #556cd6;
}

pre {
    background: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
}

.back {
    display: block;
    margin-top: 15px;
    text-decoration: none;
    color: #667eea;
}