:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --fg: #e8eaed;
    --muted: #9aa1ac;
    --line: #262a31;
    --accent: #6ea8fe;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  line-height: 1.6;
}

.site-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--line);
}

.logo {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
}

.hero {
  max-width: 34rem;
  text-align: center;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2.5rem, 8vw, 4rem);
  letter-spacing: -0.04em;
}

.lead {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
}

.note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

.site-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}

.site-footer p {
  margin: 0;
}