:root {
  --bg: #f5f4ec;
  --fg: #0f1b2d;
  --muted: #4d5868;
  --rule: #d9d7cb;
  --code-bg: #e9e7dc;
  --blue: #2a6fd1;
  --red: #c4473a;
  --alpha-bg: #fbe3df;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1b2d;
    --fg: #f5f4ec;
    --muted: #a3acb9;
    --rule: #26354d;
    --code-bg: #172539;
    --blue: #4c9bff;
    --red: #e25c4c;
    --alpha-bg: #2b2230;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main, header, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding-inline: 1.25rem;
}

header {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 1.5rem 0.5rem;
}

header a.home {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
}

header img { width: 2rem; height: 2rem; }

nav { margin-left: auto; display: flex; gap: 1.1rem; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current] { color: var(--fg); }

h1 { font-size: 2rem; line-height: 1.2; margin: 2rem 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; }
h3 { font-size: 1.05rem; margin: 1.75rem 0 0.25rem; }
ol { padding-left: 1.5rem; }

a { color: var(--blue); }

.lede { font-size: 1.15rem; color: var(--muted); margin-top: 0; }

.hero { text-align: center; padding-block: 1.5rem 0.5rem; }
.hero img { width: 7rem; height: 7rem; }
.hero h1 { margin-top: 0.75rem; }
.hero .actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem 1.25rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}
.button {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
}
.button:hover { filter: brightness(1.1); }
@media (prefers-color-scheme: dark) { .button { color: var(--bg); } }

.alpha {
  border-left: 4px solid var(--red);
  background: var(--alpha-bg);
  padding: 0.75rem 1rem;
  border-radius: 0 6px 6px 0;
  margin: 1.5rem 0;
}
.alpha strong { color: var(--red); }

code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.88em; }
code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.45;
}
pre code { background: none; padding: 0; }

ul { padding-left: 1.25rem; }
li { margin: 0.25rem 0; }

footer {
  margin-top: 3rem;
  padding-block: 1.25rem 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

.shot { margin: 1.25rem auto; max-width: 28rem; text-align: center; }
.shot img {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 10px;
}
.shot figcaption { color: var(--muted); font-size: 0.9rem; margin-top: 0.5rem; }