:root {
  --green: #14624F;
  --green-light: #1B7F6B;
  --ink: #1a1c1b;
  --muted: #5b6360;
  --bg: #f5f7f6;
  --card: #ffffff;
  --border: #e2e7e5;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans Bengali", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
header {
  background: var(--green);
  color: #fff;
  padding: 28px 20px;
}
header .wrap { max-width: 760px; margin: 0 auto; display: flex; align-items: center; gap: 14px; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header h1 { font-size: 20px; margin: 0; font-weight: 700; }
main { max-width: 760px; margin: 0 auto; padding: 28px 20px 64px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  margin: 18px 0;
}
h2 { font-size: 18px; margin: 26px 0 10px; }
h3 { font-size: 15px; margin: 20px 0 6px; color: var(--green); }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 14px; }
ol, ul { padding-left: 22px; }
a { color: var(--green-light); }
code { background: #eef2f1; padding: 2px 6px; border-radius: 6px; font-size: 90%; }
hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.bn { font-size: 15px; }
nav a { color: #cfe8e0; margin-right: 16px; font-size: 14px; text-decoration: none; }
footer { max-width: 760px; margin: 0 auto; padding: 20px; color: var(--muted); font-size: 13px; }