:root {
  --color-background: #ffffff;
  --color-foreground: #1a1a1a;
  --color-muted: #5f5f5f;
  --color-border: #e2e2e2;
  --color-card-background: #f7f7f7;
  --color-accent: #2454ff;
  --color-accent-hover: #123ad1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #121212;
    --color-foreground: #f0f0f0;
    --color-muted: #a8a8a8;
    --color-border: #2c2c2c;
    --color-card-background: #1c1c1c;
    --color-accent: #7ea0ff;
    --color-accent-hover: #a3bcff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    Meiryo, sans-serif;
  background-color: var(--color-background);
  color: var(--color-foreground);
  line-height: 1.7;
}

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

a:hover,
a:focus-visible {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0;
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.site-tagline {
  margin: 0.5rem 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

main {
  padding: 3rem 1.5rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
}

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.service-card {
  border: 1px solid var(--color-border);
  background-color: var(--color-card-background);
  border-radius: 12px;
  padding: 1.5rem;
}

.service-name {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.service-description {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0 3rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0.25rem 0;
}