:root {
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --fg: #f5f5f4;
    --muted: #a8a29e;
    --line: #292524;
    --card: #1c1917;
  }
}

* {
  box-sizing: border-box;
}

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

a {
  color: inherit;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 20px;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.site-header nav a:hover {
  color: var(--fg);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.hero {
  padding: 120px 0 96px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 8px 0 16px;
  font-size: clamp(3rem, 12vw, 7rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.card h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 16px;
  color: var(--muted);
}