:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --link: #0066cc;
  --max-width: 860px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 15px;
}

.nav-links a {
  color: var(--text);
}

.nav-links a[aria-current="page"] {
  font-weight: 600;
}

main {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 56px auto 72px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.effective {
  margin: 0 0 44px;
  color: var(--muted);
  font-size: 15px;
}

section {
  margin-top: 34px;
}

h2 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

p {
  margin: 0;
  font-size: 17px;
}

p + p {
  margin-top: 14px;
}

footer {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
  padding: 24px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer a {
  color: var(--muted);
}

@media (max-width: 560px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    padding: 14px 0;
  }

  .nav-links {
    gap: 18px;
  }

  main {
    margin-top: 40px;
  }
}