body {
    background-image: url('blackhole.jpeg');
    background-size: cover; /* ← добавить, чтобы картинка растягивалась */
    background-position: center; /* ← по центру */
    background-attachment: fixed;
}

.black-text {
    color: aliceblue;
}
.red-text {
    color: red;
}

h1 {
    text-align: center;
    padding: 50px;
    font-family: system-ui, sans-serif;
}


input {
    background-color: rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 100%;
    max-width: 300px;
    display: block;
    margin: 10px auto;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid #ffffff56;
    color: white;
    box-sizing: border-box;
}

.input-group {
    background-color: rgba(0, 0, 0, 0.466);
    padding: 20px;
    border-radius: 15px;
    max-width: 400px;
    margin: 0 auto;
    overflow: hidden;
    isolation: isolate;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.39);
}


.input-group * {
    border-radius: 10px !important;
    box-sizing: border-box;
}


.input-group button {
    background-color: rgba(0, 0, 0, 0.623);
    color: white;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    border-radius: 250px; 
    border: 1px solid #ffffff62;
    max-width: 100%;
    padding: 10px;
    display: block;
    margin: 10px auto;
    transition: 0.3s;
}

.button-group {
    display: flex;
    justify-content: center;
    padding: 5px;
}

button:hover {
    background-color: rgba(0, 0, 0, 0.466);
    transform: scale(1.30);
}

input:hover {
    transform: scale(1.05);
    background-color: rgba(0, 0, 0, 0.774);
    transition: 0.3s;
}

button {
    transition: 0.3s;
}


@media (max-width: 500px) {
    .input-group {
        max-width: 90%;
        padding: 15px;
        border-radius: 15px;
    }
    input {
        max-width: 100%;
        border-radius: 10px;
    }
    h1 {
        padding: 40px 20px;
        font-size: 24px;
    }
    .input-group * {
        border-radius: 10px !important;
    }
}
select {
    background-color: rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 100%;
    max-width: 300px;
    display: block;
    margin: 10px auto;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid #ffffff56;
    color: white;
    box-sizing: border-box;
    appearance: none;
    option {
        background-color: rgba(0, 0, 0, 0.938);
        color: white;
        padding: 10px;
        border-radius: 10px;
    }

}
select:hover {
    transform: scale(1.05);
    transition: 0.3s;
    
}