:root {
  --green: #0b6a4f;
  --green-soft: #eaf5f0;
  --text: #111827;
  --muted: #6b7280;
  --bg: #ffffff;
  --border: #e5e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --green: #34d399;
    --green-soft: #0f2a22;
    --text: #f3f4f6;
    --muted: #9ca3af;
    --bg: #0b1120;
    --border: #1f2937;
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans Thai", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 20px 64px; }
header.site {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 0; border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
header.site img { width: 44px; height: 44px; border-radius: 10px; }
header.site .name { font-size: 20px; font-weight: 800; color: var(--text); text-decoration: none; }
header.site .spacer { flex: 1; }
.lang-toggle {
  display: inline-flex; border: 1px solid var(--border); border-radius: 999px; overflow: hidden;
}
.lang-toggle button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 14px; font-size: 14px; font-weight: 700; cursor: pointer;
}
.lang-toggle button.active { background: var(--green); color: #fff; }
h1 { font-size: 28px; font-weight: 900; letter-spacing: -0.5px; margin-bottom: 4px; }
.updated { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
section h2 { font-size: 18px; font-weight: 800; margin: 26px 0 8px; color: var(--green); }
section p { white-space: pre-line; font-size: 16px; }
a { color: var(--green); }
footer {
  margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 14px;
  display: flex; flex-wrap: wrap; gap: 8px 20px;
}
[lang-block] { display: none; }
html[data-lang="en"] [lang-block="en"] { display: block; }
html[data-lang="th"] [lang-block="th"] { display: block; }
/* landing */
.hero { text-align: center; padding: 48px 0 24px; }
.hero img { width: 120px; height: 120px; border-radius: 26px; }
.hero h1 { margin-top: 18px; }
.hero p.tag { color: var(--muted); font-size: 17px; max-width: 460px; margin: 8px auto 0; }
.links { display: flex; justify-content: center; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.links a {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  background: var(--green-soft); color: var(--green);
  text-decoration: none; font-weight: 700; font-size: 15px;
}