/*================VARIABLES===============*/
:root {
	--light-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
	--mid-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
	--dark-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
	--transition: all 0.3s linear;
	--letter-space-sml: 0.1rem;
	--letter-space-mid: 0.25rem;
	--letter-space-lrg: 0.5rem;
	--clr-primary-light: #ffdd64;
	--clr-primary: #ff8f00;
	/* darkest grey - used for headings */
	--clr-grey-1: hsl(209, 61%, 16%);
	--clr-grey-2: hsl(211, 39%, 23%);
	--clr-grey-3: hsl(209, 34%, 30%);
	--clr-grey-4: hsl(209, 28%, 39%);
	/* grey used for paragraphs */
	--clr-grey-5: hsl(210, 22%, 49%);
	--clr-grey-6: hsl(209, 23%, 60%);
	--clr-grey-7: hsl(211, 27%, 70%);
	/* dark shades of secondary color*/
	--clr-secondary-1: hsl(205, 86%, 17%);
	--clr-secondary-2: hsl(205, 77%, 27%);
	--clr-secondary-3: hsl(205, 72%, 37%);
	--clr-secondary-4: hsl(205, 63%, 48%);
	/* secondary/main color */
	--clr-secondary-5: #49a6e9;
	/* other colors */
	--clr-white: #fff;
	--clr-black: #000;
	--clr-red-dark: hsl(360, 67%, 44%);
	--clr-red-light: hsl(360, 71%, 66%);
	--clr-green-dark: hsl(125, 67%, 44%);
	--clr-green-light: hsl(125, 71%, 66%);
}

/*===================FONTS=================*/
@import url("https://fonts.googleapis.com/css2?family=Roboto+Condensed:wght@300;400;700&display=swap");

*,
*::before,
*::after {
	box-sizing: border-box;
	font-family: sans-serif;
}
body {
	font-size: 62.5%;
	padding: 0;
	margin: 0;
	background: linear-gradient(to bottom right, #ffdb01, #0e197d);
}
.calc-grid {
	display: grid;
	grid-template-columns: repeat(4, 100px);
	grid-template-rows: minmax(120px, auto) repeat(5, 100px);
	justify-content: center;
	align-content: center;
	min-height: 100vh;
}
.output {
	background-color: rgba(0, 0, 0, 0.75);
	color: var(--clr-white);
	grid-column: 1 / -1;
	display: flex;
	flex-direction: column;
	align-items: flex-end;
	justify-content: space-around;
	padding: 10px;
	word-wrap: break-word;
	word-break: break-all;
}
.previous-operand {
	font-size: 1.5rem;
	color: rgb(255, 255, 255, 0.75);
}
.current-operand {
	font-size: 2.4rem;
	color: #fff;
}
.span-two {
	grid-column: span 2;
}
.calc-grid > button {
	background-color: rgb(205, 245, 255, 0.75);
	color: var(--clr-black);
	letter-spacing: var(--letter-space-sml);
	font-size: 2rem;
	outline: none;
	cursor: pointer;
	border: 1px solid var(--clr-white);
}
.calc-grid > button:hover,
.calc-grid > button:focus {
	background-color: rgb(255, 255, 255, 0.9);
}
@media screen and (max-width: 430px) {
	.calc-grid {
		grid-template-columns: repeat(4, 80px);
		grid-template-rows: minmax(100px, auto) repeat(5, 80px);
	}
}
@media screen and (max-width: 320px) {
	.calc-grid {
		grid-template-columns: repeat(4, 60px);
		grid-template-rows: minmax(100px, auto) repeat(5, 80px);
	}
	.calc-grid > button {
		font-size: 1.5rem;
		letter-spacing: normal;
	}
}