:root {
  --bg: #f6f8f7;
  --surface: #ffffff;
  --text: #17231d;
  --muted: #5a6b62;
  --border: #dbe3df;
  --accent: #1f9e63;
  --accent-ink: #146b43;
  --warn-bg: #fff6e0;
  --warn-border: #f0c75e;
  --code-bg: #eef3f0;
  --hero-a: #14532d;
  --hero-b: #1f9e63;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1b14;
    --surface: #132b1f;
    --text: #e7f6ec;
    --muted: #9adbb8;
    --border: #275c43;
    --accent: #6fe3a5;
    --accent-ink: #6fe3a5;
    --warn-bg: #2b2611;
    --warn-border: #8a7330;
    --code-bg: #0b1f17;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1b14;
  --surface: #132b1f;
  --text: #e7f6ec;
  --muted: #9adbb8;
  --border: #275c43;
  --accent: #6fe3a5;
  --accent-ink: #6fe3a5;
  --warn-bg: #2b2611;
  --warn-border: #8a7330;
  --code-bg: #0b1f17;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", "Noto Sans Bengali", "Hind Siliguri", sans-serif;
}
a { color: var(--accent-ink); }
img { max-width: 100%; height: auto; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.topbar .in {
  max-width: 960px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.topbar .brand { display: flex; align-items: center; gap: 8px; font-weight: 700; text-decoration: none; color: var(--text); }
.topbar .brand img { width: 26px; height: 26px; }
.topbar nav { margin-left: auto; display: flex; gap: 14px; flex-wrap: wrap; font-size: 15px; }
.topbar nav a { text-decoration: none; color: var(--muted); }
.topbar nav a:hover, .topbar nav a.on { color: var(--accent-ink); }
.topbar .lang { font-weight: 700; border: 1px solid var(--border); border-radius: 6px; padding: 1px 9px; }

.hero {
  background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #fff; padding: 56px 16px 48px;
}
.hero .in { max-width: 960px; margin: 0 auto; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.15; margin: 0 0 12px; }
.hero p { font-size: 19px; max-width: 640px; margin: 0 0 22px; opacity: .95; }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 700;
  text-decoration: none; background: #ffd166; color: #1d2b24;
}
.btn.ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.35); }

main { max-width: 960px; margin: 0 auto; padding: 8px 16px 64px; }
section { padding-top: 28px; }
h2 { font-size: 27px; margin: 18px 0 10px; border-bottom: 2px solid var(--border); padding-bottom: 6px; }
h3 { font-size: 20px; margin: 22px 0 6px; }
p, li { max-width: 760px; }
code, pre { font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; font-size: .9em; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--border); padding: 12px 14px; border-radius: 8px; overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; }

.note, .warn {
  border-radius: 8px; padding: 12px 14px; margin: 14px 0; max-width: 760px;
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
}
.warn { background: var(--warn-bg); border-color: var(--warn-border); border-left-color: var(--warn-border); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin: 14px 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.card h3 { margin-top: 0; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }

figure { margin: 16px 0; }
figure img { border-radius: 10px; border: 1px solid var(--border); display: block; }
figcaption { color: var(--muted); font-size: 14.5px; margin-top: 6px; }

.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; max-width: 860px; margin: 10px 0; font-size: 15.5px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }

ol.steps { padding-left: 0; list-style: none; counter-reset: s; }
ol.steps > li { counter-increment: s; position: relative; padding-left: 44px; margin: 0 0 14px; }
ol.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 1px;
  width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--bg);
  font-weight: 800; text-align: center; line-height: 30px; font-size: 15px;
}

details { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin: 8px 0; max-width: 820px; }
summary { cursor: pointer; font-weight: 600; }

footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 14.5px; }
footer .in { max-width: 960px; margin: 0 auto; padding: 18px 16px 30px; }

.why .lead { font-size: 19px; max-width: 780px; }
.why .card h3 { font-size: 17px; }
.small { color: var(--muted); font-size: 15px; }

ol.steps figure { margin: 10px 0 4px; }
ol.steps figure img { max-width: 640px; width: 100%; }

/* "New" badge and the highlighted feature card. */
.new { display: inline-block; vertical-align: middle; margin-left: 6px; padding: 1px 8px; border-radius: 999px;
  background: var(--accent); color: #fff; font: 700 11.5px/1.6 system-ui, sans-serif; letter-spacing: .04em; text-transform: uppercase; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .new { color: #06281c; } }
:root[data-theme="dark"] .new { color: #06281c; }
.card.hl { border: 2px solid var(--accent); }
.arrow { font-weight: 800; white-space: nowrap; }