body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    text-align: center;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #fff;
}
.center-screen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
/* Setup Form */
.setup-box { width: 300px; text-align: left; }
.setup-box input { width: 100%; padding: 10px; margin: 5px 0 20px 0; box-sizing: border-box; }
.btn-primary { 
    width: 100%; padding: 12px; background: #007bff; color: white; 
    border: none; border-radius: 4px; cursor: pointer; font-size: 16px; 
}
.btn-primary:hover { background: #0056b3; }

/* Game UI */
.question { font-size: 5rem; font-weight: 700; margin-bottom: 2rem; }
.answer-input { 
    font-size: 2rem; padding: 0.5rem; text-align: center; 
    border: 2px solid #ddd; border-radius: 4px; outline: none; width: 200px;
}
.answer-input:focus { border-color: #333; }
.stats-bar { margin-top: 3rem; color: #666; font-size: 0.9rem; }
.feedback { height: 2rem; margin-top: 1rem; font-weight: 500; }
.feedback.correct { color: #28a745; }
.feedback.wrong { color: #dc3545; }