@import url('https://fonts.googleapis.com/css2?family=Libertinus+Serif:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&family=Orbitron:wght@400..900&display=swap');
:root{
    --calculator-color1: #2930ff;
    --calculator-color2: #86d4db;
    --button-color1: #b0b2bb;
    --button-color2: #4a90e2;
    --button-color3: #dfdfdf;
    --equals: #6eaff1;
    --screen-bg: #e5e5e5;
    --screen-text: #080049;
    --button-text: #fff;
    --border-radius: 12px;
    --shadow: 0 4px 16px rgba(0,0,0,0.15);
}
@media(max-width: 400px){
    .title{
        margin-top: 30px;
    }
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Orbitron';
}
body{
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(#6be5db 30%, #ffffff);
    
}
.title{
    position: absolute;
    top: 20px;

}
.border{
    align-items: center;
    background: linear-gradient(-45deg, var(--calculator-color1) 10%, var(--calculator-color2));
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 24px 16px;
    width: 340px;
    min-height: 480px;
}
.buttons{
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
    gap: 12px;
}
.itemScreen{
    width: 100%;
    height: 60px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: none;
    background: var(--screen-bg);
    color: var(--screen-text);
    font-size: 2rem;
    text-align: right;
    padding: 0 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.nums {
    height: 48px;
    font-size: 1.2rem;
    border-radius: 8px;
    border: none;
    background: var(--button-color1);
    color: var(--button-text);
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: var(--shadow);
}
.nums:hover {
    background: #d1d2d6;
}
.itemEquals:hover{
    background-color: var(--equals);
}
.itemEquals {
    background: var(--button-color2);
    color: var(--button-text);
    font-weight: bold;
    grid-row: 4 / span 2;
    grid-column: 4;
    height: 108px;
}
.itemPlus{
    font-weight: bold;
    grid-column: 4;
    grid-row: 3;
}
.itemMinus{
    font-weight: bold;
    grid-column: 4;
    grid-row: 2;
}
.itemDivide{
    font-weight: bold;
    grid-column: 3;
    grid-row: 1;
}
.itemTimes{
    font-weight: bold;
    grid-column: 4;
    grid-row: 1;
}
.itemAC{
    grid-column: 1;
    grid-row: 1;
}
.itemB{
    grid-column: 2;
    grid-row: 1;
}
.item0{
    grid-column: 1 / span 2;
    grid-row: 5;
}
.item1{
    grid-column: 1;
    grid-row: 4;
}
.item2{
    grid-column: 2;
    grid-row: 4;
}
.item3{
    grid-column: 3;
    grid-row: 4;
}
.item4{
    grid-column: 1;
    grid-row: 3;
}
.item5{
    grid-column: 2;
    grid-row: 3;
}
.item6{
    grid-column: 3;
    grid-row: 3;
}
.item7{
    grid-column: 1;
    grid-row: 2;
}
.item8{
    grid-column: 2;
    grid-row: 2;
}
.item9{
    grid-column: 3;
    grid-row: 2;
}
.itemDot{
    grid-column: 3;
    grid-row: 5;
    font-weight: bold;
}
.itemAC, .itemB {
    background: var(--button-color3);
    font-weight: bold;
}
.itemAC:hover, .itemB:hover {
    background: #b28d3e;
}