* {
  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;
	width: 100vw;
	display: grid;
	place-items: center;
	padding: 1rem;
	width: 60ch;
	max-width: 100vw;
	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);
}

.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(1rem, 1vw + 1rem, 4rem);
}

.section__content h2 span:last-of-type {
	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);
}

: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%;
}

.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: 800px;
	max-width: 100vh;
	padding: 0 1rem;
	margin: 0 auto;
	height: 100%;
}

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;
}

h1 span:last-of-type {
	display: inline-block;
}

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(0.1) brightness(0.5);
	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;
	}
}