:root {
  --green: #007a3d;
  --green-bright: #00b840;
  --navy: #0a1f44;
  --red: #d9121b;
  --bg: #f6f9f7;
  --surface: #ffffff;
  --text: #101a14;
  --muted: #4d5b53;
  --line: #dfe8e2;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1511;
    --surface: #152019;
    --text: #e6efe9;
    --muted: #a3b4aa;
    --line: #25352c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hind Siliguri", "Noto Sans Bengali", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: var(--green); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
header.bar { border-bottom: 1px solid var(--line); background: var(--surface); }
header.bar .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
header.bar a.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; font-size: 18px; }
header.bar img { width: 34px; height: 34px; border-radius: 8px; }
header.bar nav a { margin-left: 16px; text-decoration: none; color: var(--muted); font-size: 15px; }
.hero { padding: 48px 0 32px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: center; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.2; margin: 0 0 8px; }
.hero .en { color: var(--muted); font-size: 18px; margin: 0 0 20px; }
.hero p.lead { font-size: 19px; margin: 0 0 24px; }
.logo-card { background: #fff; border-radius: 28px; padding: 18px; box-shadow: 0 10px 40px rgba(10, 31, 68, 0.12); max-width: 360px; justify-self: center; }
.logo-card img { width: 100%; height: auto; display: block; }
.badge { display: inline-flex; align-items: center; gap: 10px; background: var(--navy); color: #fff; padding: 12px 18px; border-radius: 12px; font-weight: 600; }
.badge small { display: block; font-weight: 400; opacity: 0.8; font-size: 12px; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding: 16px 0 48px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.card .icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: #fff; font-size: 22px; margin-bottom: 12px; }
.card h3 { margin: 0 0 4px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
footer a { color: var(--muted); }
article.doc { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 28px; margin: 28px 0 48px; }
article.doc h1 { margin-top: 0; font-size: 30px; line-height: 1.25; }
article.doc h2 { font-size: 21px; margin-top: 28px; }
article.doc .summary { background: var(--bg); border-left: 4px solid var(--green); padding: 12px 16px; border-radius: 8px; }
article.doc .meta { color: var(--muted); font-size: 14px; }
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding-top: 28px; }
  .logo-card { order: -1; max-width: 260px; }
  .features { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .features { grid-template-columns: 1fr; }
  header.bar nav a { margin-left: 10px; }
  article.doc { padding: 20px; }
}