:root {
  --green: #007a3d;
  --green-bright: #00b840;
  --navy: #0a1f44;
  --red: #d9121b;
  --bg: #f6f9f7;
  --surface: #ffffff;
  --text: #101a14;
  --muted: #4d5b53;
  --line: #dfe8e2;
  color-scheme: light;
}
* { 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; }
}

/* ---- 2026-09-28: English by default with a Bangla switch, banner, screenshots, info cards ---- */
html[data-lang="en"] .t-bn { display: none; }
html[data-lang="bn"] .t-en { display: none; }
html[data-lang="bn"] body { font-size: 17px; }
header.bar nav { display: flex; align-items: center; flex-wrap: wrap; gap: 2px 0; }
.lang { display: inline-flex; margin-left: 16px; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang button { border: 0; background: transparent; color: var(--muted); padding: 4px 10px; font: inherit; font-size: 13px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--green); color: #fff; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.button { display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: 12px; font-weight: 600; text-decoration: none; }
.button.ghost { border: 1px solid var(--line); color: var(--text); background: var(--surface); }
.banner { margin: 8px 0 24px; }
.banner img { width: 100%; height: auto; display: block; border-radius: 20px; box-shadow: 0 10px 40px rgba(10, 31, 68, 0.12); }
.screens { padding: 8px 0 24px; }
.screens h2, .info h3 { margin: 0 0 12px; font-size: 24px; }
.strip { display: flex; gap: 14px; overflow-x: auto; padding: 4px 0 12px; scroll-snap-type: x mandatory; }
.strip img { flex: 0 0 auto; width: 200px; height: auto; border-radius: 18px; border: 1px solid var(--line); background: #000; scroll-snap-align: start; }
.info { display: grid; grid-template-columns: 1.4fr 1fr; gap: 16px; padding: 8px 0 48px; }
.info ul { margin: 0 0 12px; padding-left: 20px; }
.info li { margin: 6px 0; }
.info .small { color: var(--muted); font-size: 14px; }
article.doc h3 { font-size: 17px; margin: 18px 0 6px; }
article.doc table { border-collapse: collapse; width: 100%; font-size: 15px; }
article.doc th, article.doc td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
article.doc .steps li { margin: 6px 0; }
@media (max-width: 820px) {
  .info { grid-template-columns: 1fr; }
  .strip img { width: 160px; }
}
@media (max-width: 520px) {
  header.bar .wrap { height: auto; flex-wrap: wrap; padding: 8px 16px; gap: 4px 12px; }
  header.bar a.brand { white-space: nowrap; }
  header.bar nav { gap: 2px 12px; }
  header.bar nav a { margin-left: 0; font-size: 14px; }
  .lang { margin-left: 0; }
}