:root {
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: "Times New Roman", Times, serif;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --ink: #0a0a0a;
  --paper: #ffffff;
  --muted: #757575;
  --rule: #e0e0e0;

  --scrim: rgb(255 255 255 / 0.34);

  --band-scrim: rgb(255 255 255 / 0.34);

  --hero-ink: #0a0a0a;
  --hero-paper: #ffffff;
  --hero-rule: rgb(10 10 10 / 0.25);

  --panel-ink: #f2f2f2;
  --panel-muted: #b9b9b9;
  --panel-rule: rgb(255 255 255 / 0.22);
  --panel-paper: #0a0a0a;

  --measure: 62rem;
  --gutter: 2rem;

  --top-pad: 6rem;

  --footer-h: 5.5rem;
}

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

html {
  scroll-behavior: smooth;

  background-color: var(--paper);
  background-image: linear-gradient(var(--scrim), var(--scrim)),
    var(--hero, none);
  background-repeat: no-repeat;

  background-size: 100% calc(100vh + 6rem),
    max(100%, calc((100vh + 6rem) * 16 / 9)) auto;
  background-size: 100% calc(100svh + 6rem),
    max(100%, calc((100svh + 6rem) * 16 / 9)) auto;
  background-position: top center;

  overflow-x: clip;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0 auto;
  max-width: var(--measure);
  padding: var(--top-pad) var(--gutter) 0;

  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ink);

  letter-spacing: -0.01em;

  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-weight: 400;
  margin: 0;
}

p {
  margin: 0 0 1rem;
}

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.15s;
}

a:hover {
  border-bottom-color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

@media (max-width: 40rem) {
  :root {
    --gutter: 1.25rem;
    --top-pad: 3.5rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f2;
    --paper: #0a0a0a;
    --muted: #8a8a8a;
    --rule: #3a3a3a;

    --panel-muted: #8a8a8a;
    --panel-rule: #3a3a3a;

  }
}

.hero-1 {
  --hero: url("../assets/gradients/sky-blue.jpg");
  --scrim: rgb(255 255 255 / 0.01);
  --band-scrim: rgb(255 255 255 / 0.01);
}

.hero-2 {
  --hero: url("../assets/gradients/pink.jpg");
  --scrim: rgb(255 255 255 / 0.02);
  --band-scrim: rgb(255 255 255 / 0.22);
}

@media (min-resolution: 2dppx) {
  .hero-1 {
    --hero: url("../assets/gradients/sky-blue@2x.webp");
  }

  .hero-2 {
    --hero: url("../assets/gradients/pink@2x.webp");
  }
}