/* Kiểu chung cho các trang mẫu. Widget chat tự mang CSS riêng (widget.js). */
:root {
  --bg: #f7f7f5;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --line: #e4e4e0;
  --accent: #0068ff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #141414; --fg: #f0f0f0; --muted: #9a9a9a; --line: #2e2e2e; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--fg); }
main { max-width: 640px; margin: 0 auto; padding: 14vh 16px 120px; }
h1 { font-size: 2.5rem; line-height: 1.15; margin: 0 0 .5rem; }
p { color: var(--muted); margin: 0 0 1rem; }
a { color: var(--accent); }
ul { padding-left: 1.2rem; }
li { margin: .25rem 0; }
code { font-size: .875em; background: var(--line); padding: 1px 5px; border-radius: 4px; }