:root {
  --bg: #fdfdfc;
  --text: #1c1c1e;
  --muted: #5f6368;
  --accent: #0b57d0;
  --border: #e3e3e0;
  --surface: #f4f4f2;
  --max-width: 40rem;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --text: #e8e8e6;
    --muted: #a0a0a6;
    --accent: #8ab4f8;
    --border: #2e2e32;
    --surface: #202024;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0 auto;
  max-width: var(--max-width);
  min-height: 100vh;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

main {
  flex: 1;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 2rem 0 1rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.site-header ul {
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  color: var(--text);
  text-decoration: underline;
}

.card {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.card p {
  margin: 0.5rem 0;
}

.button {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
}

.button:hover {
  border-color: var(--muted);
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}