:root {
  --ink: #0b1b2b;
  --muted: #5b6b7d;
  --line: #e3e9f0;
  --accent: #1878f0;
  --bg: #f6f9fd;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8eef6;
    --muted: #9fb0c2;
    --line: #21313f;
    --accent: #63a6ff;
    --bg: #0c141c;
    --card: #121c26;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 40px 20px 96px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Thai",
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

main {
  max-width: 720px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 36px;
}

h1 { font-size: 28px; line-height: 1.35; margin: 0 0 6px; }
h2 { font-size: 19px; margin: 40px 0 10px; padding-top: 20px; border-top: 1px solid var(--line); }
h2:first-of-type { border-top: 0; padding-top: 0; }
h3 { font-size: 16px; margin: 24px 0 6px; }

p, li { color: var(--ink); }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 8px; }
.lede { color: var(--muted); }

ul { padding-left: 22px; }
li { margin: 6px 0; }

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

table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; letter-spacing: .02em; }

.callout {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 18px 0;
}

.wrap { overflow-x: auto; }

footer {
  max-width: 720px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

hr.lang { margin: 56px 0 40px; border: 0; border-top: 2px solid var(--line); }