:root {
  color-scheme: dark;
  --bg-top: #061225;
  --bg-bottom: #0b2b63;
  --card: rgba(255, 255, 255, 0.09);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f6fbff;
  --muted: #c4d0df;
  --accent: #16d6a4;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  background:
    radial-gradient(circle at 80% 20%, rgba(22, 214, 164, 0.12), transparent 28rem),
    linear-gradient(145deg, var(--bg-top), var(--bg-bottom));
}

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

a:hover {
  text-decoration: underline;
}

.page {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 64px 0;
}

.hero {
  padding: 56px 0 36px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05;
}

h2 {
  margin: 0 0 12px;
  font-size: 24px;
}

p {
  color: var(--muted);
  line-height: 1.8;
}

.updated {
  margin-top: 10px;
  color: var(--muted);
}

.card,
.link-card,
.legal section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  padding: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.link-card {
  display: block;
}

.link-card span {
  display: block;
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
}

.link-card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.legal {
  display: grid;
  gap: 18px;
}

.note {
  font-size: 14px;
  color: #9fb0c4;
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 28px, 920px);
    padding: 36px 0;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}