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

body{
    background: #1f1f2e; /* dark navy background */
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container{
    width: 90%;
    max-width: 500px;
    background: #2c2c3e; /* slightly lighter dark */
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    text-align: center;
}

.container h1{
    font-weight: 600;
    font-size: 2rem;
    line-height: 1.3;
}

.container h1 span{
    color: #00ffc6; /* neon green accent */
    border-bottom: 3px solid #00ffc6;
    padding-bottom: 5px;
}

.display{
    width: 100%;
    margin: 30px 0;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    border-radius: 10px;
    color: #333;
}

.display input{
    border: none;
    outline: none;
    font-size: 1.2rem;
    width: 80%;
    color: #333;
}

.display img{
    width: 25px;
    cursor: pointer;
}

button{
    border: none;
    outline: none;
    background: #00ffc6;
    color: #1f1f2e;
    font-size: 1.1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px 20px;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.3s ease;
    margin-top: 10px;
}

button img{
    width: 22px;
    margin-right: 10px;
}

button:hover{
    background: #00e0b0;
}

@media screen and (max-width: 480px){
    .container{
        padding: 30px 20px;
    }
    .container h1{
        font-size: 1.5rem;
    }
    .display input{
        font-size: 1rem;
    }
    button{
        font-size: 1rem;
        padding: 12px 16px;
    }
}