:root {
  color-scheme: light dark;
  --bg: #f9fafb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --card: #191c22;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2a2e37;
    --accent: #60a5fa;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

header.page-header {
  margin-bottom: 32px;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

header.page-header .brand {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}

.lang-switch {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 9px;
}

.lang-switch:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.notice {
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: -8px;
}

h1 {
  font-size: 26px;
  margin: 12px 0 4px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 32px;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 16px;
}

h2 {
  font-size: 17px;
  margin-top: 0;
}

h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

p, li {
  font-size: 14.5px;
  color: var(--text);
}

ul {
  padding-left: 20px;
}

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

.placeholder {
  background: #fef3c7;
  color: #92400e;
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 13px;
}

@media (prefers-color-scheme: dark) {
  .placeholder {
    background: #3f2f0a;
    color: #fcd34d;
  }
}

nav.footer-nav {
  margin-top: 32px;
  font-size: 14px;
}

nav.footer-nav a {
  margin-right: 16px;
}