:root { --teal: #136686; --green: #8bb341; --text: #1f2937; --muted: #6b7280; --bg: #ffffff; --rule: #e5e7eb; }
@media (prefers-color-scheme: dark) {
  :root { --text: #e5e7eb; --muted: #9aa3b2; --bg: #111418; --rule: #2a3038; --teal: #4fb3d9; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
header { background: #136686; padding: 14px 16px; }
.brand { color: #fff; font-weight: 800; font-size: 20px; text-decoration: none; }
.brand span { color: var(--green); }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 40px; }
h1 { font-size: 28px; line-height: 1.25; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 28px 0 6px; }
h3 { font-size: 17px; margin: 18px 0 4px; }
a { color: var(--teal); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.muted { color: var(--muted); }
footer { border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; text-align: center; padding: 16px; }