:root {
  color-scheme: light;
  --page-bg: #edf3f0;
  --paper: #fbfdfb;
  --ink: #203433;
  --muted: #526966;
  --rule: #cbd9d5;
  --accent: #236d62;
  --accent-soft: #e4efeb;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page-bg: #17211f;
    --paper: #1d2b28;
    --ink: #e7f0ed;
    --muted: #aec0ba;
    --rule: #3d514c;
    --accent: #87cabb;
    --accent-soft: #253c36;
  }
}

* { box-sizing: border-box; }
html { background: var(--page-bg); }
body {
  margin: 0;
  padding: clamp(20px, 5vw, 64px) 16px;
  background: var(--page-bg);
  color: var(--ink);
  font: 17px/1.72 Charter, "Iowan Old Style", Georgia, serif;
}
main {
  width: min(100%, 760px);
  margin: 0 auto;
  padding: clamp(28px, 7vw, 64px);
  background: var(--paper);
  border-left: 3px solid var(--accent);
}
header { padding-bottom: 26px; border-bottom: 1px solid var(--rule); }
.brand, nav, .date, footer, .notice, h2 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.brand { color: var(--muted); font-size: .88rem; }
h1 { margin: 16px 0 4px; font-size: clamp(2.25rem, 7vw, 3.5rem); line-height: 1.08; letter-spacing: -.045em; font-weight: 600; }
.date { margin: 8px 0 0; color: var(--muted); font-size: .9rem; }
nav { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 22px; font-size: .9rem; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 2px; }
.notice { margin: 26px 0; padding: 14px 18px; background: var(--accent-soft); color: var(--ink); font-size: .94rem; line-height: 1.55; }
h2 { margin: 32px 0 8px; font-size: 1.04rem; line-height: 1.35; letter-spacing: -.01em; }
p { max-width: 68ch; margin: 0 0 14px; }
footer { margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--muted); font-size: .9rem; }
@media (max-width: 480px) { body { padding: 0; } main { padding: 30px 20px; border-left-width: 2px; } }