:root {
  color-scheme: light;
  --accent: #d6ff00;
  --ink: #111111;
  --muted: #5b5b5b;
  --surface: #f4f4f4;
  --border: #dddddd;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #ffffff;
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

header {
  background: var(--accent);
  border-bottom: 2px solid var(--ink);
}

.bar, main, footer {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
}

.bar {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--ink);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-decoration: none;
}

nav { display: flex; gap: 18px; }
nav a, footer a { color: var(--ink); }

main { padding: 68px 0 84px; }

h1, h2 {
  line-height: 1.15;
  letter-spacing: -0.035em;
}

h1 { margin: 0 0 10px; font-size: clamp(42px, 8vw, 68px); }
h2 { margin-top: 48px; font-size: 26px; }

.updated { color: var(--muted); margin-bottom: 44px; }

.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px 24px;
}

li + li { margin-top: 8px; }

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 26px 0 48px;
  font-size: 15px;
}

@media (max-width: 560px) {
  .bar { align-items: flex-start; flex-direction: column; padding: 20px 0; }
  main { padding-top: 48px; }
}