:root {
  color-scheme: light dark;
  --bg: #f5f7f7;
  --ink: #15202b;
  --muted: #4a5864;
  --accent: #1d5b78;
  --horizon: #1d5b78;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1620;
    --ink: #e6eaec;
    --muted: #a3afb8;
    --accent: #86bbd3;
    --horizon: #e2a64a;
  }
}

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

html {
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

.wrap {
  max-width: 40rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.top {
  padding-block: clamp(3rem, 12vh, 7rem) 1.5rem;
}

.mark {
  display: block;
  width: 2.5rem;
  height: auto;
  margin-block-end: 1.5rem;
  color: var(--horizon);
}

h1 {
  margin: 0 0 0.5rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.25rem, 1.5rem + 3.2vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.3rem;
  color: var(--muted);
}

.horizon {
  height: 2px;
  background: var(--horizon);
}

.body {
  padding-block: 2.5rem 3rem;
}

.lead {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.55;
}

h2 {
  margin: 2.5rem 0 0.5rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.6rem;
  line-height: 1.2;
}

p {
  margin: 0 0 1rem;
}

blockquote {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 1.1rem;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

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

footer {
  padding-block: 2rem 3rem;
  font-size: 0.95rem;
  color: var(--muted);
}

@media (forced-colors: active) {
  .horizon {
    background: CanvasText;
  }
}