:root {
  --color-title: #78004f;
  --color-heading: #003c9b;
  --color-section: #a00055;
  --color-section-alt: #5500a0;
  --color-body: #150b2b;
  --color-body-alt: #3c0b39;
  --color-body-toolbox: #003c38;
  --color-body-notes: #44200b;
  --color-link: #8a004f;
  --color-link-toolbox: #002fa0;
  --color-link-notes: #5c168e;
  --color-separator: #21142e;
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  min-height: 100vh;
  margin: 0;
  background: repeating-linear-gradient(
    90deg,
    #ff1010 0px, #ff0099 60px, #eb00ff 120px,
    #7000ff 180px, #0044ff 240px, #00ddff 300px,
    #00f94b 360px, #ffff00 420px, #ff8900 480px,
    #ff1010 540px
  );
  color: var(--color-body);
  font: bold 18px/1.4 "Times New Roman", Times, serif;
}

main {
  width: min(100% - 48px, 860px);
  margin: 0 auto;
  padding: 34px 0 64px;
}

h1, h2, h3, p { margin: 0; }

.site-title {
  color: var(--color-title);
  font-size: 48px;
  line-height: 1.1;
}

hr {
  border: 0;
  border-top: 2px solid var(--color-separator);
  margin: 18px 0 28px;
}

section + section { margin-top: 34px; }

.welcome-heading {
  color: var(--color-heading);
  font-size: 36px;
  line-height: 1.15;
  margin-bottom: 18px;
}

.section-heading {
  color: var(--color-section);
  font-size: 26px;
  margin-bottom: 14px;
}

.section-heading-alt { color: var(--color-section-alt); }

.project-name {
  font-size: 20px;
  margin-top: 16px;
}

a, a:visited { color: var(--color-link); }
a:hover, a:focus-visible { text-decoration-thickness: 2px; }
a.toolbox-link, a.toolbox-link:visited { color: var(--color-link-toolbox); }
a.notes-link, a.notes-link:visited { color: var(--color-link-notes); }

p { margin-top: 8px; }
p + p { margin-top: 14px; }
.intro-second { color: var(--color-body-alt); }
.toolbox-description { color: var(--color-body-toolbox); }
.notes-description { color: var(--color-body-notes); }

@media (max-width: 600px) {
  main {
    width: min(100% - 32px, 860px);
    padding-top: 26px;
  }

  .site-title { font-size: clamp(34px, 10vw, 48px); }
  .welcome-heading { font-size: 30px; }
  .section-heading { font-size: 24px; }
  body { font-size: 16px; }
}