:root {
  --bg: #faf9f6;
  --text: #2b2b2b;
  --muted: #6b6b6b;
  --accent: #1f5fa8;
  --rule: #e3e0d8;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Yu Gothic", Meiryo, system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.8;
}

main {
  max-width: 36rem;
  margin: 0 auto;
  padding: 18vh 1.5rem 4rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 .en {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.7em;
  white-space: nowrap;
}

.tagline {
  margin: 0 0 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
}

p {
  margin: 0 0 1rem;
}

nav ul {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

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

a:hover,
a:focus-visible {
  text-decoration-thickness: 2px;
}