body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 700px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
h1,h2 { text-align: center; }
.hidden { display: none; }
button {
    background: #007BFF;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    width: 100%;
}
button:hover { background: #0056b3; }
.question { margin: 15px 0; }
.timer {
    text-align: right;
    font-weight: bold;
    color: red;
    margin-bottom: 10px;
}
.result {
    text-align: center;
    font-size: 20px;
    font-weight: bold;
}
input[type="text"], input[type="email"] {
    width: 100%;
    padding: 8px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}
label { display: block; margin: 5px 0; }

/* Responsive */
@media (max-width: 600px) {
    .container { padding: 15px; }
    button { font-size: 14px; }
}