* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, sans-serif;
    color: #333;
    background: #f9f9f9;
    display: flex;
    justify-content: center;
    padding: 4rem 1rem;
}

main {
    max-width: 600px;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

button {
    font-size: 1rem;
    padding: 0.6rem 1.4rem;
    border: 2px solid #333;
    border-radius: 6px;
    background: #333;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #555;
}

#time-display {
    margin-top: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    min-height: 1.5em;
}

p:last-of-type {
    margin-top: 2rem;
    line-height: 1.6;
    color: #666;
}