*, *:before, *:after {
	box-sizing: inherit;
}

:root {
    --primaryFont: "PT Mono";
    --baseFontSize: 1rem;
    --displayFontSize: 2.5rem;
    --buttonFontSize: 1.5rem;
}

body {
    font-size: var(--baseFontSize);
    background: rgb(5,15,48);
    background: linear-gradient(90deg, rgba(5,15,48,1) 0%, rgba(6,49,91,1) 40%, rgba(6,49,91,1) 60%, rgba(5,15,48,1) 100%);
}

.content {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    min-height: 200px;
    width: 400px;
    padding: 20px;
    padding-top: 10px;
    border: 2px solid #e26ef6;
    box-shadow:0px 0px 30px 10px #e26ef6 ,0px 0px 15px 0px #e26ef6 inset;
    border-radius: 15px;
    animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        box-shadow:0px 0px 30px 10px #e26ef6 ,0px 0px 15px 0px #e26ef6 inset;
    }
    to {
        box-shadow:0px 0px 40px 20px #f49abb ,0px 0px 10px 0px #f49abb inset;
        border-color: #f49abb;
    }
}

.display {
    font-family: var(--primaryFont);
    font-size: var(--displayFontSize);
    font-weight: bold;
    color: #d42533;
    background-color: #000;
    margin-bottom: 10px;
    margin-top: 10px;
    min-height: 70px;
    text-align: right;
    line-height: 70px;
    padding: 5px;
    margin-bottom: 15px;
    border: 1px solid #e26ef6;
    word-break: break-all;
}

button {
    outline: none;
    background-color: transparent;
    border: 2px solid #e26ef6;
    color: #e26ef6;
    font-family: var(--primaryFont);
    font-size: var(--buttonFontSize);
    height: 70px;
    min-width: 70px;
    transition: all 0.2s ease-in-out;
}

.btn-delete, .btn-clear {
    color: #d42533;
    border-color: #d42533;
}

.btn-delete:hover, .btn-delete:focus, .btn-clear:hover, .btn-clear:focus {
    color: #d42533;
    border-color: #d42533;
    text-shadow: 0px 0px 3px #d42533;
    box-shadow: 0px 0px 10px 3px #d42533 ,0px 0px 10px 0px #d42533 inset;   
}

.btn-equals {
    color: #54f8a1;
    border-color: #54f8a1;
}

.btn-equals:hover, .btn-equals:focus {
    color: #54f8a1;
    border-color: #54f8a1;
    text-shadow: 0px 0px 3px #54f8a1;
    box-shadow: 0px 0px 10px 3px #54f8a1 ,0px 0px 10px 0px #54f8a1 inset;   
}

button:hover, button:focus {
    color: #f8cfa7;
    border-color: #f8cfa7;
    text-shadow: 0px 0px 3px #f8cfa7;
    box-shadow: 0px 0px 10px 3px #f8cfa7 ,0px 0px 10px 0px #f8cfa7 inset;
}

button:active, .btn-equals:active,  .btn-delete:active, .btn-clear:active{
    color: #6feafc;
    border-color: #6feafc;
    text-shadow: 0px 0px 3px #6feafc;
    box-shadow: 0px 0px 10px 3px #6feafc ,0px 0px 10px 0px #6feafc inset;   
}

.btn-clear {
    grid-row-start: 6;
    grid-column: span 2;
}

.btn-delete {
    grid-row-start: 6;
    grid-column: 3 / span 2; 
}

.button-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 5px;  
}