* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Sarabun', 'Noto Sans Thai', Roboto, sans-serif;
  background: #f1f5f9;
  color: #1e293b;
}
button, input, select, textarea { font-family: inherit; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }