* {
    box-sizing: border-box;
}

body {
    display: grid;
    place-items: center;
    min-height: 100vh;
    font-family: SF Pro Text, SF Pro Icons, Helvetica Neue, Helvetica, Arial, sans-serif;
    color: hsl(0 0% 100%);
    background: hsl(0, 0%, 38%);
}

section {
    min-height: 100vh;
    display: grid;
    place-items: center;
}

.section__content {
    min-height: 100vh;
    position: sticky;
    top: 0;
    display: grid;
    place-items: center;
    padding: 1rem;
    width: 100%;
    max-width: 60ch;
    margin: 0 auto;
}

.section__content p {
    font-weight: 600;
    max-width: 40ch;
    font-size: clamp(1rem, 1vw + 1rem, 4rem);
    margin: 0;
    color: hsl(0 0% 100% / 0.5);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.section__content h2 {
    text-align: left;
    display: grid;
    gap: 0;
}

.section__content h2 span:first-of-type {
    opacity: 0.5;
    padding-left: 1rem;
    font-size: clamp(0.8rem, 1vw + 0.8rem, 2rem);
    display: block;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.section__content h2 span:last-of-type {
    display: block;
    background: linear-gradient(
            90deg,
            hsl(0 0% 100%),
            hsl(0 0% 80%) 50%,
            hsl(240deg 100% 75%),
            hsl(320deg 100% 75%),
            hsl(140deg 100% 75%),
            hsl(10deg 100% 75%)
    );
    -webkit-background-clip: text;
    color: transparent;
    background-size: 300% 200%;
    animation: bg-move both linear;
    animation-timeline: --section;
    animation-range: cover 0% exit 0%;
    background-position: 0 0;
}

@keyframes bg-move {
    to {
        background-position: 100% 200%;
    }
}

.section__content p span {
    color: hsl(0 0% 100% / 1);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

:is(h1, h2) {
    margin: 0;
    font-size: 2.5rem;
}

section:nth-of-type(1),
section:nth-of-type(2),
section:nth-of-type(3),
section:nth-of-type(4) {
    position: relative;
    width: 100vw;
    display: block;
    view-timeline-name: --section;
}

/* CTA Specific stuff goes here.... */
.cta {
    position: sticky;
    z-index: 10;
    top: calc(100% - 6rem);
    display: inline-block;
    width: 100%;
    display: grid;
    place-items: center;
    /* Activates showing the CTA */
    animation: activate both linear, activate linear reverse;
    animation-timeline: --section, view();
    animation-range: entry, cover 50%;
}

@media (max-width: 768px) {
    .cta {
        top: calc(100% - 5rem);
    }
    
    .cta a {
        padding: 0.75rem;
        font-size: 1rem;
    }
}

.cta__content {
    position: relative;
}

/* Word */
.cta span:nth-of-type(1) {
    opacity: var(--scale, 0);
    transition: opacity 0.2s 0.6s;
    white-space: nowrap;
    padding: 0 0 0 0.5rem;
}

/* The Bloom */
.cta__content::before {
    --back: linear(
            0, 0.3412 4.06%, 0.6411 8.2%,
            0.9005 12.43%, 1.1205 16.77%,
            1.3013 21.22%, 1.4438 25.8%,
            1.549 30.54%, 1.5878 32.98%,
            1.6175 35.47%, 1.6457 39.41%,
            1.6518 41.44%, 1.6528 43.52%,
            1.6391 47.83%, 1.6042 52.44%,
            1.5562 56.74%, 1.4899 61.5%,
            1.202 78.86%, 1.0988 85.97%,
            1.0551 89.79%, 1.0244 93.36%,
            1.0061 96.75%, 1
    );
    content: "";
    background: hsl(210 100% 45%);
    position: absolute;
    inset: 0;
    border-radius: 100px;
    z-index: -1;
}

/* The icon holder */
.cta span:nth-of-type(2) {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: hsl(210 100% 45%);
    color: white;
    padding: 0.25rem;
    display: grid;
    place-items: center;
}

.cta svg {
    width: 20px;
    fill: hsl(0 0% 100% / 0.75);
}

.cta a:is(:hover, :focus-visible) svg {
    fill: white;
}

.cta a {
    --elastic: linear(
            0, 0.4789 7.06%, 0.7612 12.38%,
            0.8693 15.13%, 0.9538 17.95%,
            1.0165 20.89%, 1.059 24.04%,
            1.0829 27.58%, 1.0884 31.64%,
            1.0769 36.44%, 1.0202 50.6%,
            1.0005 59.62%, 0.9945 70.6%, 1
    );
    text-decoration-line: none;
    overflow: hidden;
    border-radius: 100px;
    padding: 1rem;
    background: hsl(240 2% 20% / 1);
    box-shadow: 0 1px hsl(0 0% 100% / 0.25) inset;
    color: hsl(0 0% 100%);
    display: grid;
    align-items: center;
    font-weight: 600;
    letter-spacing: -0.01em;
    font-size: 1.1rem;
    grid-template-columns: 0 36px;
}


@keyframes activate {
    0% { --active: 0; }
    100% { --active: 1; }
}

section:nth-of-type(1) {
    height: 200vh;
}

section:nth-of-type(2) {
    --content-size: 186px;
    height: 400vh;
}

section:nth-of-type(3) {
    --content-size: 180px;
    height: 300vh;
}

section:nth-of-type(4) {
    --content-size: 140px;
    height: 500vh;
}

/* Use style queries to dictate the timing, etc. */
@container style(--active: 0) {
    .cta__content::before {
        scale: 0;
        opacity: 0;
        transition: scale 0.5s var(--back);
    }
    .cta a {
        scale: 0;
        transition: scale 0.2s 0.7s, grid-template-columns 0.5s 0.2s var(--elastic);
        grid-template-columns: 0 36px;
    }
    .cta__content span:first-of-type {
        opacity: 0;
        transition: opacity 0.2s 0s;
    }
    .cta__content span:last-of-type {
        scale: 0;
        opacity: 0;
        transition: scale 0.2s, opacity 0.2s;
    }
}
@container style(--active: 1) {
    .cta__content::before {
        scale: 0.99;
        opacity: 1;
        transition: scale 0.5s var(--back);
    }
    .cta a {
        scale: 1;
        transition: scale 0.2s 0s, grid-template-columns 0.5s 0.6s var(--elastic);
        grid-template-columns: var(--content-size, auto) 36px;
    }
    .cta__content span:first-of-type {
        opacity: 1;
        transition: opacity 0.2s 0.7s;
    }
    .cta__content span:last-of-type {
        scale: 1;
        opacity: 1;
        transition: scale 0.2s 0.4s, opacity 0.2s 0.4s;
    }
}

/* Nav stuff */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    border-bottom: 1px solid hsl(0 0% 50%);
    height: 52px;
    background: hsl(0 0% 20% / 0.75);
    backdrop-filter: blur(4px);
    z-index: 2;
}


.nav__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 800px;
    padding: 0 1rem;
    margin: 0 auto;
    height: 100%;
}

.lang-switch button {
    background: none;
    border: 1px solid #ddd;
    padding: 5px 10px;
    margin-right: 2px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.75rem;
    color: white;
}

@media (max-width: 480px) {
    .lang-switch button {
        padding: 4px 6px;
        font-size: 0.7rem;
    }
    
    nav a {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
}

.lang-switch button.active {
    background-color: hsl(210 100% 45%);
    border-color: hsl(210 100% 45%);
}

nav a {
    text-decoration: none;
    background: hsl(210 100% 45%);
    color: hsl(0 0% 98%);
    font-weight: 400;
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.875rem;
}

nav img {
    height: 50%;
    justify-self: start;
}

.support {
    position: fixed;
    z-index: 10;
    left: 1rem;
    top: 1rem;
    background: white;
    color: black;
    padding: 2rem;
    border: 4px solid hsl(45 80% 50%);
}

@supports (animation-timeline: view()) {
    .support {
        display: none;
    }
}

/* Heading */
h1 {
    display: grid;
}

:is(h1, h2) {
    font-size: clamp(2.5rem, 7vw + 1rem, 10rem);
    text-align: center;
    line-height: 1;
    margin: 0;
    width: 100%;
}

h1 {
    position: fixed;
    top: 50%;
    left: 50%;
    translate: -50% -50%;
}

h1 span:first-of-type {
    display: inline-block;
    color: hsl(0 100% 50%);
    font-size: 0.35em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

h1 span:last-of-type {
    display: inline-block;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

h1 span:first-of-type {
    display: inline-block;
    animation: fade-away both linear;
    animation-timeline: --section;
    animation-range: entry-crossing 50% exit 50%;
}

h1 span:last-of-type {
    display: inline-block;
    animation: scale-up both cubic-bezier(.1,.7,.9,1.3), fade-away both linear;
    animation-timeline: --section;
    animation-range: entry-crossing 60% exit 70%, exit 10% exit 50%;
}

@keyframes scale-up {
    to {
        scale: 1.5;
    }
}

@keyframes grow {
    0% {
        scale: 0.5;
        opacity: 0;
    }
}

@keyframes fade-away {
    100% {
        opacity: 0;
    }
}


video {
    position: fixed;
    inset: 0;
    object-fit: cover;
    width: 100%;
    height: 100vh;
    z-index: -1;
    filter: saturate(1) brightness(0.6);
    opacity: 0;
    animation: fade-in both linear, fade-out both linear;
    animation-timeline: --section;
    animation-range: entry 10% entry 15%, exit 10% exit 15%;
}

@keyframes fade-in {
    to {
        opacity: 0.2;
    }
}

@keyframes fade-out {
    to {
        opacity: 0;
    }
}