:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #5f6368;
  --rule: #e3e3e6;
  --accent: #0b7a5a;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --fg: #ececef;
    --muted: #a0a0a8;
    --rule: #2c2c31;
    --accent: #4fd1a5;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 "Noto Sans Thai", "Sukhumvit Set", "Leelawadee UI", system-ui, sans-serif;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}

h1 { font-size: 1.75rem; line-height: 1.3; margin: 0 0 .25rem; }
h2 { font-size: 1.2rem; margin: 2.25rem 0 .5rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 .25rem; }

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

.meta { color: var(--muted); font-size: .9rem; margin: 0 0 1.5rem; }

nav.lang { font-size: .9rem; margin-bottom: 2rem; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: .5rem .5rem .5rem 0; border-bottom: 1px solid var(--rule); }
th { font-weight: 600; }

.table-scroll { overflow-x: auto; }

footer { color: var(--muted); font-size: .85rem; margin-top: 3rem; }