:root {
  --bg: #f6f3ec;
  --ink: #1d1b18;
  --muted: #6b655b;
  --rule: #d8d2c5;
  --accent: #8a2b1d;
  --accent-ink: #fbf8f2;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171512;
    --ink: #ece7dc;
    --muted: #a39c8e;
    --rule: #38332b;
    --accent: #e08a72;
    --accent-ink: #1a120e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Charter, "Iowan Old Style", Georgia, "Times New Roman", serif;
  font-size: 1.125rem;
  line-height: 1.6;
}

main {
  max-width: 38rem;
  margin: 0 auto;
  padding: clamp(3rem, 10vh, 6rem) 1rem 4rem;
}

main.wide { max-width: 56rem; }

a { color: var(--accent); text-underline-offset: 0.15em; }

h1 {
  margin: 0;
  font-size: clamp(3rem, 12vw, 4.75rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.grammar {
  margin: 0.5rem 0 2.5rem;
  color: var(--muted);
  font-style: italic;
}

h2 {
  margin: 3rem 0 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.quotes { margin: 0; padding: 0; list-style: none; }
.quotes li { padding: 1.25rem 0; border-bottom: 1px solid var(--rule); }
.quotes blockquote { margin: 0; }
.quotes .source { display: block; margin-top: 0.25rem; font-size: 0.9375rem; color: var(--muted); }

.next { margin: 3rem 0 0; font-size: 1.375rem; }

.back { margin: 0 0 2rem; font-size: 1rem; }

.columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(2rem, 6vw, 4rem);
}

.columns h2 { margin-top: 2.5rem; }

.app { padding: 1.5rem 0; border-bottom: 1px solid var(--rule); }
.app h3 { margin: 0; font-size: 1.5rem; font-weight: 400; line-height: 1.25; }
.app p { margin: 0.375rem 0 1rem; }

.button {
  display: inline-block;
  padding: 0.5rem 1.125rem;
  border-radius: 3px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 1rem;
  text-decoration: none;
}

.button:hover { filter: brightness(1.1); }
.button:focus-visible, a:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.meta { margin-left: 0.625rem; font-size: 0.875rem; color: var(--muted); }

@media (max-width: 40rem) {
  .columns { grid-template-columns: minmax(0, 1fr); }
}