:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #f59e0b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

h1 {
  font-size: 2rem;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.25rem;
  margin: 40px 0 8px;
  border-bottom: 1px solid var(--panel);
  padding-bottom: 4px;
}

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

.lead {
  color: var(--muted);
  margin: 0 0 24px;
}

.hero {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}

.hero img {
  width: 240px;
  max-width: 100%;
  border-radius: 16px;
}

.hero div {
  flex: 1;
  min-width: 240px;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #1f2937;
  font-weight: bold;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 999px;
}

footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: 0.875rem;
}