style.css

html {
    --color-dark: #000000;
    --color-light: #ffffff;
    --color-main: #c300ff;
    --color-secondary: #f7931e;
    font-family: 'Alegreya Sans', sans-serif;
    --font-light: 300;
    --font-bold: 700;
    --grid-rows: 4;
    --grid-columns: 11;
    --grid-gap: 10px;
    --color-graticule: #b6b6b6;
    --color-main-light: #f7acf9;
    --color-secondary-light: #feffe7;
}

body {
    overflow-x: hidden;
    margin: 0;
    -webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

h1 {
    font-size: 23.5vw;
    line-height: 0.7;
    margin: 0;
    text-transform: lowercase;
    font-variant: small-caps;
    color: var(--color-main);
    -webkit-mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
    -webkit-mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
            mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
            mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
}

h2 {
    font-size: 4.5vw;
    margin: 3.5vw 0 0;
    font-weight: var(--font-light);
    -webkit-mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
    -webkit-mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
            mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
            mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
}

h3 {
    font-size: 7.6vw;
    margin: 0;
    color: var(--color-main);
}

em {
    text-decoration: underline;
    font-style: normal;
    font-variant: small-caps;
}


/* Header section styles */

.header__background {
    width: 100%;
    height: 100vh;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    background: -webkit-gradient(linear, left top, left bottom, color-stop(25%, var(--color-light)), color-stop(62.5%, var(--color-secondary)), to(var(--color-main)));
    background: linear-gradient(var(--color-light) 25%, var(--color-secondary) 62.5%, var(--color-main) 100%);
    opacity: 0.5;
    z-index: -1;
}

.header__background::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: 80px;
    background: -webkit-gradient(linear, left top, left bottom, from(var(--color-main)), to(var(--color-light)));
    background: linear-gradient(var(--color-main), var(--color-light));
}

.header__section {
    width: 100%;
    height: 100vh;
    display: grid;
    grid-template-rows: repeat(var(--grid-rows), calc(100vh / var(--grid-rows)));
    grid-template-columns: repeat(var(--grid-columns), calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)));
    -webkit-column-gap: var(--grid-gap);
            column-gap: var(--grid-gap);
}

.header__title {
    grid-row: 2 / span 2;
    grid-column: 2 / -2;
}

.header__text {
    grid-row: 2 / span 2;
    grid-column: 2 / -2;
}

header p {
    font-size: 5.6vw;
    font-weight: var(--font-light);
    line-height: 1.35;
    margin: 0;
    -webkit-mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
    -webkit-mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
            mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(0, 0, 0, 0)), to(rgba(0, 0, 0, 0)));
            mask-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
}

header em {
    color: var(--color-main);
}


/* Flow section styles */

.flows__container {
    width: 100%;
    height: 100vh;
    display: grid;
    grid-template-rows: repeat(var(--grid-rows), calc(100vh / var(--grid-rows)));
    grid-template-columns: repeat(var(--grid-columns), calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)));
    -webkit-column-gap: var(--grid-gap);
            column-gap: var(--grid-gap);
    position: -webkit-sticky;
    position: sticky;
    top: 0;
}

.flows__container h3 {
    grid-row: 1 / span 1;
    grid-column: 2 / -2;
    align-self: flex-end;
}

.flows__container svg {
    grid-row: 2 / -1;
    grid-column: 1 / -1;
    width: 100%;
    margin-top: 8vh;
}

.links path {
    fill: none;
    opacity: 0.3;
    -webkit-filter: blur(0px);
            filter: blur(0px);
    -webkit-transition: stroke-dashoffset 1s ease, opacity 0.3s linear, -webkit-filter 0.5s linear;
    transition: stroke-dashoffset 1s ease, opacity 0.3s linear, -webkit-filter 0.5s linear;
    transition: stroke-dashoffset 1s ease, filter 0.5s linear, opacity 0.3s linear;
    transition: stroke-dashoffset 1s ease, filter 0.5s linear, opacity 0.3s linear, -webkit-filter 0.5s linear;
}

.links-top path {
    fill: none;
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
}

.links path.direct,
.links-top path.direct {
    stroke: url('#gradient-direct');
}

.links path.conduit--forward,
.links-top path.conduit--forward {
    stroke: url('#gradient-conduit-forward');
}

.links path.conduit--backward,
.links-top path.conduit--backward {
    stroke: url('#gradient-conduit-backward');
}

.path1 {
    stroke-width: 60;
    stroke-dasharray: 487;
    stroke-dashoffset: 487;
}

.path2 {
    stroke-width: 40;
    stroke-dasharray: 487;
    stroke-dashoffset: 487;
}

.path3 {
    stroke-width: 20;
    stroke-dasharray: 341;
    stroke-dashoffset: 341;
}

.path4 {
    stroke-width: 20;
    stroke-dasharray: 268;
    stroke-dashoffset: 268;
}

.path5 {
    stroke-width: 10;
    stroke-dasharray: 123;
    stroke-dashoffset: 123;
}

.path6 {
    stroke-width: 20;
    stroke-dasharray: 195;
    stroke-dashoffset: 195;
}

.path7 {
    stroke-width: 10;
    stroke-dasharray: 501;
    stroke-dashoffset: 501;
}

.path8 {
    stroke-width: 10;
    stroke-dasharray: 302;
    stroke-dashoffset: 302;
}

.links path.shown {
    stroke-dashoffset: 0;
}

.links .path7.shown {
    stroke-dashoffset: 1002;
}

.links .path8.shown {
    stroke-dashoffset: 604;
}

.links path.faded {
    opacity: 0;
}

.links path.blurred {
    -webkit-filter: url('#blur');
    filter: url('#blur');
}

.links-top path.shown {
    opacity: 0.1;
}

.nodes line {
    fill: none;
    stroke: var(--color-dark);
    opacity: 0;
}

.nodes line.line--destination,
.nodes line.flow--return {
    stroke: var(--color-main);
}

.nodes line.line--conduit {
    stroke: #666666;
}

.nodes line.flow--return.shown {
    opacity: 0.4;
}

.nodes text {
    font-size: 16px;
    font-weight: var(--font-light);
    font-variant: small-caps;
    text-decoration: underline;
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
}

.flows__text {
    grid-row: -2 / span 1;
    grid-column: 2 / span 9;
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
    z-index: 2;
}

.flows__text p {
    margin: 0;
    padding: 0.5rem 0.7rem;
    font-size: 1rem;
    border: 2px solid var(--color-dark);
}

.flows__container span.step2 {
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
}

.flows__container span.blurred {
    font-variant: small-caps;
    -webkit-filter: blur(0.75px);
            filter: blur(0.75px);
}

.nodes line.shown,
.nodes text.shown,
.flows__text.shown,
.flows__container span.step2.shown,
.globe__text.shown,
.globe__text p.step1.shown,
.globe__text span.shown {
    opacity: 1;
}

.flows__trace {
    grid-row: -2 / span 1;
    grid-column: 2 / span 9;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    z-index: 2;
}

.trace__container {
    margin: 0 0.2rem 1rem 0;
    width: 20px;
    height: 3px;
    border: 2px solid var(--color-dark);
}

.trace {
    width: 100%;
    height: 100%;
    background-color: var(--color-dark);
    -webkit-transform-origin: left center;
            transform-origin: left center;
    -webkit-transform: scaleX(0);
            transform: scaleX(0);
}

.flows__marker,
.globe__marker {
    height: 50vh;
    pointer-events: none;
}


/* Globe section styles */

.globe__container {
    width: 100%;
    height: 125vh;
    display: grid;
    grid-template-rows: repeat(calc(var(--grid-rows) + 1), calc(100vh / var(--grid-rows)));
    grid-template-columns: repeat(var(--grid-columns), calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)));
    -webkit-column-gap: var(--grid-gap);
            column-gap: var(--grid-gap);
    position: -webkit-sticky;
    position: sticky;
    top: 0;
}

.globe__container h3 {
    grid-row: 1 / span 1;
    grid-column: 2 / -2;
    margin-top: 3rem;
}

.globe__map {
    grid-row: 3 / -1;
    grid-column: 2 / span 10;
}

.globe__text {
    grid-row: 1 / span 3;
    grid-column: 2 / span 9;
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
    z-index: 2;
}

.globe__container p {
    margin: 1rem 0;
    padding: 0.5rem 0.7rem;
    font-size: 1rem;
    border: 2px solid var(--color-dark);
    background-color: var(--color-light);
}

.globe__container p:first-child {
    margin-top: 7rem;
}

.globe__container p.step1,
.globe__container span {
    opacity: 0;
    -webkit-transition: opacity 0.3s;
    transition: opacity 0.3s;
}

.globe__text em {
    -webkit-transition: color 0.3s;
    transition: color 0.3s;
}

.globe__text em.highlighted {
    color: var(--color-main);
}

.globe__trace {
    grid-row: -3 / span 1;
    grid-column: 2 / span 9;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    z-index: 2;
}


/* End section styles */

.conclusions {
    width: 100%;
    height: calc(100vh - 90px);
    display: grid;
    grid-template-rows: repeat(var(--grid-rows), calc(100vh / var(--grid-rows)));
    grid-template-columns: repeat(var(--grid-columns), calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)));
    -webkit-column-gap: var(--grid-gap);
            column-gap: var(--grid-gap);
}

.conclusions__text {
    grid-row: 2 / span 2;
    grid-column: 2 / span 9;
}

.conclusions p {
    font-size: 5.8vw;
    font-weight: var(--font-light);
    line-height: 1.35;
    margin: 0 0 2rem;
}

.conclusions a {
    position: relative;
    display: inline-block;
    padding: 0.5rem 0.8rem;
    font-size: 5.8vw;
    font-weight: var(--font-light);
    font-variant: small-caps;
    text-decoration: none;
    color: var(--color-dark);
    border: 2px solid var(--color-dark);
}

.conclusions a:last-of-type {
    margin: 1rem 0 0 0;
}

.conclusions a::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: -webkit-gradient(linear, left top, right top, from(var(--color-main)), to(var(--color-secondary)));
    background: linear-gradient(to right, var(--color-main), var(--color-secondary));
    opacity: 0.5;
    z-index: -1;
}

.conclusions p.show--small {
    margin: 1rem 0 0;
    font-size: 1rem;
}

footer {
    background-color: var(--color-dark);
    height: 90px;
    padding: 2rem calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)) 1rem;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}

footer p {
    margin: 0 2rem 0 0;
    color: var(--color-light);
    font-variant: small-caps;
    font-weight: var(--font-light);
}

footer svg {
    width: 108px;
    height: 61px;
}

footer path {
    fill: var(--color-light);
}

footer polygon {
    fill: none;
    stroke: var(--color-light);
}

/* Methodology */
.methodology {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)));
    -webkit-column-gap: var(--grid-gap);
            column-gap: var(--grid-gap);
    margin-bottom: 4rem;
}

.methodology__text {
    grid-column: 2 / span 9;
}

.methodology h4 {
    margin: 4rem 0 0.6rem;
    font-size: 1.4rem;
    font-weight: var(--font-bold);
    font-variant: small-caps;
    color: var(--color-main);
    border-bottom: 1px solid var(--color-main);
}

.methodology p {
    font-size: 1.2rem;
    line-height: 1.45;
    margin: 0.6rem 0;
}

.methodology img {
    margin: 2rem 0;
}

.methodology span {
    font-style: italic;
}

.methodology em {
    font-weight: var(--font-light);
    text-decoration: none;
    color: var(--color-main);
}

@media (min-width: 768px) {
    h1 {
        font-size: 17.2vw;
    }
    h2 {
        font-size: 3.5vw;
        margin: 1.5vw 0 0;
    }
    h3 {
        font-size: 5vw;
    }
    .header__title {
        grid-column: 3 / -3;
    }
    .header__text {
        grid-column: 3 / -3;
    }
    header p {
        font-size: 4.3vw;
    }
    .flows__container h3,
    .globe__container h3 {
        grid-column: 3 / -3;
        align-self: flex-end;
    }
    .flows__container svg {
        grid-column: 1 / -2;
    }
    .flows__text,
    .flows__trace {
        grid-column: 3 / span 5;
    }
    .globe__trace {
        grid-column: 3 / span 6;
    }
    .flows__text p {
        font-size: 1.3rem;
    }
    .globe__container h3 {
        margin-top: 0;
    }
    .globe__text {
        grid-row: 2 / span 2;
        grid-column: 3 / span 6;
    }
    .globe__container p {
        font-size: 1.3rem;
    }
    .globe__container p:first-child {
        margin-top: 3rem;
    }
    .globe__map {
        grid-row: 2 / -1;
    }
    .conclusions__text {
        grid-column: 3 / span 7;
    }
    .conclusions p {
        font-size: 4.6vw;
        margin: 0 0 5rem;
    }
    .conclusions a {
        font-size: 3.8vw;
    }
    .conclusions p.show--small {
        margin: 1.2rem 0 0;
        font-size: 1.2rem;
    }
    footer {
        padding: 2rem calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns) * 2.5) 1rem;
    }
    footer svg {
        width: 120px;
        height: 68px;
    }
    .methodology__text {
        grid-column: 3 / span 7;
    }
    .methodology img {
        width: 70%;
        margin: 2rem 15%;
    }
}

@media (min-width: 992px) {
    h1 {
        font-size: 11.2vw;
        line-height: 1.1;
    }
    h2 {
        margin: 0;
    }
    h3 {
        font-size: 3.5vw;
    }
    .header__title {
        grid-column: 2 / -2;
    }
    .header__text {
        grid-column: 2 / span 7;
    }
    header p {
        font-size: 3vw;
    }
    .flows__container h3,
    .globe__container h3 {
        grid-column: 2 / -2;
    }
    .flows__container svg {
        grid-column: 3 / -3;
    }
    .flows__text,
    .flows__trace {
        grid-column: 2 / span 3;
    }
    .globe__text {
        grid-column: 2 / span 4;
    }
    .globe__map {
        grid-row: 1 / -1;
        grid-column: 5 / span 10;
    }
    .globe__trace {
        grid-column: 2 / span 4;
    }
    .conclusions__text {
        grid-column: 2 / span 7;
    }
    .conclusions p {
        font-size: 3vw;
    }
    .conclusions a {
        display: inline;
        font-size: 2.2vw;
    }
    .conclusions a:last-of-type {
        margin: 0 0 0 1rem;
    }
    .conclusions a::before {
        opacity: 0;
        -webkit-transition: opacity 0.3s;
        transition: opacity 0.3s;
    }
    .conclusions a:hover::before {
        opacity: 0.5;
    }
    .conclusions p.show--small {
        display: none;
    }
    footer {
        padding: 2rem calc((100% - var(--grid-gap) * (var(--grid-columns) - 1)) / var(--grid-columns)) 1rem;
    }
    .methodology__text {
        grid-column: 2 / span 5;
    }
    .methodology img {
        width: 50%;
        margin: 2rem 25%;
    }
}