:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2e;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #1e293b;
    --primary: #60a5fa;
    --primary-soft: #172554;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.65 Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

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

h1,
h2,
h3 {
  line-height: 1.25;
}

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

h2 {
  font-size: 1.25rem;
  margin: 40px 0 8px;
}

.muted {
  color: var(--muted);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.brand img {
  width: 72px;
  height: 72px;
  border-radius: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 24px;
  margin: 24px 0;
}

.notice {
  background: var(--primary-soft);
  border-color: transparent;
}

ul {
  padding-left: 1.25rem;
}

li + li {
  margin-top: 6px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
}

footer {
  margin-top: 56px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}