* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

body {
    background:#0a1f29;
    color: #fff;
}

.container {
    margin: 12% auto;
    width: 90%;
    max-width: 700px;
    padding: 0 5%;
}

.display {
    width: 100%;
    margin: 50px 0 30px;
    background: #fff;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.6rem 1.2rem;
    border-radius: 5px;
    flex-wrap: wrap; /* allow elements to wrap on small screens */
    gap: 10px;
}

.container h1 {
    font-weight: 500;
    font-size: 2.5rem;
    line-height: 1.3;
}

.container h1 span {
    color: #019f55;
    border-bottom: 4px solid #019f55;
    padding-bottom: 7px;
}

.display img {
    width: 28px;
    cursor: pointer;
}

.display input {
    border: 0;
    outline: 0;
    font-size: 1.5rem;
    width: 80%;
    background: transparent;
    color: #333;
}

.container button img {
    width: 24px;
    margin-right: 10px;
}

.container button {
    border: 0;
    outline: 0;
    background: #019f55;
    color: #fff;
    font-size: 1.3rem;
    font-weight: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
}

/* ✅ MEDIA QUERY for phones */
@media (max-width: 600px) {
    .container {
        margin: 20% auto;
        padding: 0 5%;
    }

    .container h1 {
        font-size: 1.8rem;
        text-align: center;
    }

    .display {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
    }

    .display input {
        font-size: 1.2rem;
        width: 100%;
        text-align: center;
    }

    .display img {
        align-self: center;
    }

    .container button {
        width: 100%;
        padding: 0.9rem;
        font-size: 1.2rem;
    }
}