:root {
  --text-font: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Arial, Meiryo, sans-serif;
  --white: #ffffff;
  --black: #263238;
  --lightgrey: #eeeeee;
  --grey: #bdbdbd;
  --blue: #0277bd;
  --pink: #ad1457;
  --yellow: #fbc02d;
}

html {
  font-family: var(--text-font);
  font-size: 20px;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  color: var(--black);
  background: var(--white);
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

main {
  font-size: 18px;
  line-height: 1.65;
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  padding: 0;
  background: var(--white);
  z-index: 2;
  overflow-y: auto;
  box-sizing: border-box;
}

article {
  width: min(820px, calc(100vw - 32px));
  max-height: none;
  background: transparent;
  padding: 72px 24px 40px;
  margin: 0 auto;
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
  box-sizing: border-box;
}

article img,
article video {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

h1 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.2rem;
  margin: 2rem 0 0.5rem;
}

p {
  margin: 1rem 0;
}

footer {
  margin-top: 2rem;
  text-align: center;
}

small {
  font-size: 0.85rem;
  opacity: 0.75;
}

ul,
ol {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

li {
  margin: 0.35rem 0;
}

a {
  color: var(--pink);
  font-weight: bold;
  text-decoration: none;
}