body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    overflow: hidden; /* Hide scrollbars */
}

#test-area {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100vw;
    text-align: center;
    color: white;
    transition: background-color 0.1s ease; /* Smooth color transition */
    cursor: pointer; /* Indicate it's clickable */
}

/* --- State Styles --- */

/* Initial State: Ready to start */
#test-area.initial {
    background-color: #3498db; /* Blue */
}

/* Ready State: Waiting for the change (RED) */
#test-area.ready {
    background-color: #e74c3c; /* Red */
}

/* Go State: Click now! (GREEN) */
#test-area.go {
    background-color: #2ecc71; /* Green */
}

/* --- Text Styles --- */

#headline {
    font-size: 3em;
    margin: 10px;
}

#instruction {
    font-size: 1.5em;
    margin-bottom: 30px;
}

#result-display {
    font-size: 2.5em;
    font-weight: bold;
    color: #ffcc00; /* Yellow for results */
}

#best-time {
    font-size: 1.2em;
    margin-top: 15px;
}