:root {
  color-scheme: dark;
  --black: #000000;
  --stone: #505050;
  --stone-light: #808080;
  --green: #60a860;
  --blue: #4030a8;
  --text: #d8d8d8;
  --muted: #a8a8a8;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--black);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, transparent 49%, rgba(64, 48, 168, 0.18) 50%, transparent 51%) 0 0 / 112px 28px,
    linear-gradient(var(--stone) 2px, transparent 2px) 0 0 / 100% 28px,
    var(--black);
  color: var(--text);
  font-family: "Courier New", Courier, monospace;
  line-height: 1.65;
}

a {
  color: var(--green);
  text-underline-offset: 0.22em;
}

a:hover,
a:focus-visible {
  color: #8fd08f;
}

.shell {
  width: min(960px, calc(100% - 32px));
  margin: 36px auto;
  background: rgba(0, 0, 0, 0.96);
  border: 2px solid var(--stone-light);
  box-shadow: 8px 8px 0 var(--blue), inset 0 0 0 1px var(--stone);
}

.masthead {
  padding: 28px clamp(20px, 5vw, 52px);
  border-bottom: 1px solid var(--stone);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: #ffffff;
  font-size: clamp(1.8rem, 5vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 70ch;
  margin: 16px 0 0;
  color: var(--muted);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px clamp(20px, 5vw, 52px);
  border-bottom: 1px solid var(--stone);
}

.site-nav a {
  display: inline-block;
  padding: 7px 11px;
  border: 1px solid var(--stone);
  color: var(--text);
  text-decoration: none;
}

.site-nav a[aria-current="page"],
.site-nav a:hover,
.site-nav a:focus-visible {
  border-color: var(--green);
  color: var(--green);
}

.content {
  padding: 12px clamp(20px, 5vw, 52px) 40px;
}

section {
  padding: 24px 0;
  border-bottom: 1px solid #303030;
}

section:last-child {
  border-bottom: 0;
}

h2 {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

p,
ul {
  max-width: 76ch;
  margin: 0 0 12px;
}

li + li {
  margin-top: 7px;
}

.notice {
  border-left: 4px solid var(--blue);
  padding-left: 16px;
  color: var(--muted);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  padding: 18px clamp(20px, 5vw, 52px);
  border-top: 1px solid var(--stone);
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 560px) {
  .shell {
    width: calc(100% - 18px);
    margin: 14px auto;
    box-shadow: 4px 4px 0 var(--blue);
  }

  .site-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-nav a {
    text-align: center;
  }
}