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

body {
    margin: 0;
    padding: 0;
}

img {
    max-width: 100%;
}

:root {
    --gap: 30px;
}

/* grid */

.content-box {
    max-width: 1450px;
    margin: 0 auto;
    padding: 0 20px;
}

.row {
    display: flex;
    gap: var(--gap);
}

.column-2,
.column-3,
.column-4,
.column-5,
.column-6,
.column-7,
.column-8,
.column-9,
.column-10,
.column-11,
.column-12 {
    display: flex;
    gap: var(--gap);
    flex-wrap: wrap;
}

.column-2 > div {
	width: calc((100% - (1* var(--gap))) /2);
}

.column-3 > div {
	width: calc((100% - (2* var(--gap))) /3);
}

.column-4 > div {
	width: calc((100% - (3* var(--gap))) /4);
}

.column-5 > div {
	width: calc((100% - (4* var(--gap))) /5);
}

.column-6 > div {
	width: calc((100% - (5* var(--gap))) /6);
}

.column-7 > div {
	width: calc((100% - (6* var(--gap))) /7);
}

.column-8 > div {
	width: calc((100% - (7* var(--gap))) /8);
}

.column-9 > div {
	width: calc((100% - (8* var(--gap))) /9);
}

.column-10 > div {
	width: calc((100% - (9* var(--gap))) /10);
}

.column-11 > div {
	width: calc((100% - (10* var(--gap))) /11);
}

.column-12 > div {
	width: calc((100% - (11* var(--gap))) /12);
}

.col-1-2 {
    flex-basis: calc(100%/2);
}

.col-1-3 {
    flex-basis: calc(100%/3);
} 

.col-1-4 {
    flex-basis: calc(100%/4);
}

.col-1-5 {
    flex-basis: calc(100%/5);
}

.col-1-6 {
    flex-basis: calc(100%/6);
}

.col-2-3 {
    flex-basis: calc(100%/3 *2);
}

.col-2-5 {
    flex-basis: calc(100%/5 *2);
}

.col-3-4 {
    flex-basis: calc(100%/4 *3);
}

.col-3-5 {
    flex-basis: calc(100%/5 *3);
}

.col-4-5 {
    flex-basis: calc(100%/5 *4);
}

.col-5-6 {
    flex-basis: calc(100%/6 *5);
}

@media only screen and (min-width: 769px) and (max-width: 1200px) {
    :root {
    --gap: 20px;
    }

    .column-5 > div,
    .column-6 > div, 
    .column-7 > div,
    .column-8 > div,
    .column-9 > div {
        width: calc((100% - (3* var(--gap))) /4);
    }

    .column-10 > div,
    .column-11 > div,
    .column-12 > div {
        width: calc((100% - (4* var(--gap))) /5);
    }
}

@media only screen and (min-width: 480px) and (max-width: 768px) {
    :root {
    --gap: 20px;
    }

    .column-3 > div,
    .column-4 > div,
    .column-5 > div {
        width: calc((100% - (1* var(--gap))) /2);
    }

    .column-6 > div, 
    .column-7 > div,
    .column-8 > div,
    .column-9 > div {
        width: calc((100% - (2* var(--gap))) /3);
    }
    
    .column-10 > div,
    .column-11 > div,
    .column-12 > div {
        width: calc((100% - (2* var(--gap))) /3);
    }
}

@media only screen and (max-width: 480px) {
    :root {
    --gap: 15px;
    }
    
    .column-2 > div,
    .column-3 > div {
        width: 100%;
    }

    .column-4 > div,
    .column-5 > div,
    .column-6 > div {
        width: calc((100% - (1* var(--gap))) /2);
    }

    .column-7 > div,
    .column-8 > div,
    .column-9 > div,
    .column-10 > div,
    .column-11 > div ,
    .column-12 > div {
        width: calc((100% - (2* var(--gap))) /3);
    }
}
    
@media only screen and (max-width: 768px) {
    .row {
        flex-wrap: wrap;
    }
    .col-1-2,
    .col-1-3,
    .col-1-4,
    .col-1-5,
    .col-1-6,
    .col-2-3,
    .col-2-5,
    .col-3-4,
    .col-3-5,
    .col-4-5,
    .col-5-6 {
    flex-basis: 100%;
}
}