body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
    font-family: Arial, sans-serif;
    background: linear-gradient(180deg, #f7f7f7 0%, #e9eef5 100%);
    color: #1f2933;
}

.app {
    width: min(100%, 28rem);
    text-align: center;
    padding: 2rem;
    border-radius: 1rem;
    background-color: #ffffff;
    box-shadow: 0 1rem 2rem rgba(31, 41, 51, 0.12);
}

h1 {
    margin: 0 0 0.75rem;
}

.intro {
    margin: 0 0 1.5rem;
    line-height: 1.5;
    color: #52606d;
}

.timer {
    margin: 1rem 0;
    font-size: clamp(2.5rem, 10vw, 4rem);
    font-variant-numeric: tabular-nums;
}

button {
    border: 0;
    border-radius: 999px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    color: #ffffff;
    background-color: #0b6e4f;
}

button:hover {
    background-color: #09573f;
}

button:focus-visible {
    outline: 3px solid #f0b429;
    outline-offset: 3px;
}

.status {
    min-height: 1.5rem;
    margin: 1rem 0 0;
    color: #52606d;
}