:root {
  --paper: #ffffff;
  --card: #f5f5f5;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --pin: #426188;
  --link: #2b7fff;
  --focus: #34c759;
  --line: #e6e6e6;
  --display: "Familjen Grotesk", "Hiragino Sans", sans-serif;
  --body: "Atkinson Hyperlegible", "Hiragino Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.6;
  background:
    radial-gradient(circle at 50% -80px, rgba(66, 97, 136, 0.08), transparent 42%),
    var(--paper);
}

a {
  color: var(--link);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--pin);
  outline-offset: 3px;
}

.wrap {
  width: min(640px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.mark {
  width: 88px;
  height: 88px;
  display: block;
}

.mark circle.ring {
  transform-origin: 44px 44px;
  animation: sweep 14s linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .mark circle.ring {
    animation: none;
  }
}

@keyframes sweep {
  to {
    transform: rotate(360deg);
  }
}

.brand {
  margin: 18px 0 0;
  font-family: var(--display);
  font-weight: 600;
  font-size: 40px;
  letter-spacing: -0.04em;
  line-height: 1;
}

.lead {
  margin: 8px 0 0;
  color: var(--muted);
  font-family: var(--display);
  font-weight: 500;
  font-size: 18px;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  gap: 18px;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 500;
}

.nav a[aria-current="page"] {
  color: var(--pin);
  box-shadow: inset 0 -2px 0 var(--pin);
}

.lang {
  display: flex;
  gap: 6px;
}

.lang button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 500 14px/1 var(--display);
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
}

.lang button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--card);
}

html[lang="ja"] .en,
html[lang="en"] .ja {
  display: none;
}

h1 {
  margin: 28px 0 0;
  font-family: var(--display);
  font-weight: 600;
  font-size: 28px;
  letter-spacing: -0.03em;
}

.card {
  margin-top: 16px;
  padding: 20px;
  background: var(--card);
  border-radius: 12px;
}

.card h2 {
  margin: 0 0 8px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
}

.card p,
.card li {
  margin: 0;
}

.card p + p,
.card ul {
  margin-top: 8px;
}

.card ul {
  padding-left: 1.2em;
}

.card li + li {
  margin-top: 4px;
}

.card + .card {
  margin-top: 12px;
}

.mail {
  font-family: var(--display);
  font-weight: 500;
}

.updated {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}