:root {
  --bg: #fafaf7;
  --text: #1a1a1a;
  --accent: #c8551e;
  --muted: #6b6b6b;
  --border: #e5e5e0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.6;
}

header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  z-index: 10;
}

.header-btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.header-btn:hover { opacity: 0.9; }

.header-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px;
}

main h1 { font-size: 32px; line-height: 1.2; margin-top: 0; }
main h2 { font-size: 22px; margin-top: 40px; }
main h3 { font-size: 18px; margin-top: 32px; }

main p, main li { font-size: 17px; }
main a { color: var(--accent); }

main code {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 15px;
  background: rgba(0,0,0,0.04);
  padding: 2px 4px;
  border-radius: 2px;
}

.loading { color: var(--muted); font-style: italic; }