:root {
  --bg: #ffffff;
  --fg: #1c2321;
  --muted: #5b6b66;
  --accent: #0f9d8f;
  --accent-2: #1b7f6b;
  --card: #f4f8f7;
  --border: #e2ece9;
  --link: #0f8f9d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1513;
    --fg: #e8efec;
    --muted: #9db3ac;
    --accent: #34d3bf;
    --accent-2: #4fe0c0;
    --card: #16211d;
    --border: #223029;
    --link: #4fd6e0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}
.hero {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  padding: 40px 22px 34px;
}
.hero .wrap { max-width: 760px; margin: 0 auto; }
.hero a.back { color: rgba(255,255,255,.9); text-decoration: none; font-size: 15px; }
.hero a.back:hover { text-decoration: underline; }
.hero h1 { margin: 14px 0 6px; font-size: 30px; letter-spacing: -0.02em; }
.hero .date { margin: 0; opacity: .9; font-size: 15px; }
main { max-width: 760px; margin: 0 auto; padding: 30px 22px 60px; }
main h2 {
  font-size: 21px;
  letter-spacing: -0.01em;
  margin: 34px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
main h2:first-of-type { margin-top: 6px; }
a { color: var(--link); }
ul { padding-left: 20px; }
li { margin: 7px 0; }
.callout {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 18px 0;
}
.callout strong { color: var(--accent-2); }
.muted { color: var(--muted); font-size: 15px; }
footer {
  border-top: 1px solid var(--border);
  max-width: 760px;
  margin: 0 auto;
  padding: 22px;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: space-between;
}
footer a { color: var(--muted); }
.home-links { list-style: none; padding: 0; }
.home-links li { margin: 14px 0; }
.home-links a { font-size: 19px; font-weight: 600; text-decoration: none; }
.home-links a:hover { text-decoration: underline; }