:root {
  color-scheme: light dark;
  --bg: #0b0d10;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #4da3ff;
  --card: #14171c;
  --border: #262a30;
  --placeholder-bg: #3a1f00;
  --placeholder-fg: #ffb454;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7f8;
    --fg: #16181c;
    --muted: #55595f;
    --accent: #0a66c2;
    --card: #ffffff;
    --border: #e2e4e8;
    --placeholder-bg: #fff3cd;
    --placeholder-fg: #8a5a00;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 64px;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
}

header.page {
  padding: 40px 0 8px;
}

h1 { font-size: 1.8rem; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin-top: 2.5rem; border-top: 1px solid var(--border); padding-top: 1.5rem; }
h3 { font-size: 1.05rem; }

.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 2rem; }

.lang-switch { margin: 1rem 0 2rem; font-size: 0.9rem; }
.lang-switch a { color: var(--accent); text-decoration: none; }

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 16px 0;
}

.placeholder {
  background: var(--placeholder-bg);
  color: var(--placeholder-fg);
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.92em;
}

footer.page {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

nav.top {
  display: flex;
  gap: 1.25rem;
  padding: 16px 0 0;
  font-size: 0.9rem;
}