:root {
  --accent: #0b5ea8;
  --bg: #ffffff;
  --text: #1c2430;
  --muted: #5a6675;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans Thai", "Sarabun", system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}
header {
  border-bottom: 1px solid #e3e7ec;
  padding: 1rem 1.5rem;
}
nav a { margin-right: 1.25rem; color: var(--accent); text-decoration: none; }
nav a:hover { text-decoration: underline; }
main { max-width: 800px; margin: 0 auto; padding: 1.5rem; }
.hero {
  background: #f2f7fc;
  border-radius: 12px;
  padding: 2.5rem 2rem;
  margin-bottom: 2rem;
}
.hero h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.5rem; border-bottom: 2px solid var(--accent); padding-bottom: .3rem; margin-top: 2.5rem; }
h3 { font-size: 1.1rem; margin-bottom: .3rem; color: var(--text); }
.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: .75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}
.cta:hover { background: #094c88; }
footer { border-top: 1px solid #e3e7ec; padding: 1.5rem; text-align: center; color: var(--muted); font-size: .9rem; }
@media (max-width: 600px) {
  .hero { padding: 1.5rem 1.25rem; }
  .hero h1 { font-size: 1.5rem; }
}