:root {
  --bg: #f6f9fc;
  --surface: #ffffff;
  --text: #0f1e2e;
  --muted: #536476;
  --line: #e2e9f1;
  --blue: #2f9be0;
  --green: #22b36b;
  --bolt: #ffd60a;
  --navy: #0b1b2b;
  --grad: linear-gradient(135deg, #2f9be0 0%, #2bc3a0 55%, #22b36b 100%);
  --radius: 20px;
  --shadow: 0 10px 30px rgba(15, 30, 46, .08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07131f;
    --surface: #0f2133;
    --text: #e8f0f7;
    --muted: #9db0c3;
    --line: #1d3247;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Plus Jakarta Sans", "Hind Siliguri", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
:lang(bn) body, body:lang(bn) { font-family: "Hind Siliguri", "Plus Jakarta Sans", system-ui, sans-serif; }
img { max-width: 100%; display: block; }
a { color: inherit; }
.wrap { width: min(1140px, 100% - 32px); margin-inline: auto; }

/* Header */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; text-decoration: none; letter-spacing: -.01em; }
.brand img { width: 36px; height: 36px; border-radius: 10px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 600; font-size: .95rem; }
.nav-links a:hover { color: var(--text); }
.lang { border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; }
@media (max-width: 760px) { .nav-links .hide-sm { display: none; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px; border-radius: 14px; font-weight: 700;
  text-decoration: none; transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-play { background: #000; color: #fff; box-shadow: 0 8px 24px rgba(0,0,0,.25); }
.btn-play svg { width: 26px; height: 26px; }
.btn-play small { display: block; font-size: .68rem; font-weight: 500; opacity: .8; line-height: 1; }
.btn-play span { line-height: 1.15; text-align: left; }
.btn-ghost { border: 1.5px solid var(--line); color: var(--text); background: var(--surface); }
.btn-sm { padding: 9px 16px; border-radius: 12px; font-size: .9rem; background: var(--grad); color: #fff; }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(1200px 600px at 85% -10%, rgba(47,155,224,.25), transparent 60%),
              radial-gradient(900px 500px at -10% 110%, rgba(34,179,107,.22), transparent 60%),
              var(--navy);
  color: #fff;
}
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; padding: 72px 0 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15);
  padding: 6px 14px; border-radius: 999px; font-size: .85rem; font-weight: 600;
}
.eyebrow b { color: var(--bolt); }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); line-height: 1.08; letter-spacing: -.03em; margin: 18px 0; }
.hero h1 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 1.12rem; color: #c3d3e2; max-width: 560px; }
.cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 22px; }
.hero .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.25); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; padding-bottom: 56px; }
.chips span { font-size: .85rem; color: #c3d3e2; background: rgba(255,255,255,.06); padding: 6px 12px; border-radius: 10px; }
.hero-shot { align-self: end; display: flex; justify-content: center; }
.hero-shot img { width: min(380px, 100%); filter: drop-shadow(0 30px 60px rgba(0,0,0,.5)); border-radius: 28px 28px 0 0; }
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; text-align: center; padding-top: 48px; }
  .hero p.lead { margin-inline: auto; }
  .cta, .chips { justify-content: center; }
  .chips { padding-bottom: 8px; }
  .hero-shot img { width: min(300px, 80%); }
}

/* Sections */
section { padding: 88px 0; }
.head { text-align: center; max-width: 700px; margin: 0 auto 48px; }
.head .tag { color: var(--green); font-weight: 800; font-size: .85rem; text-transform: uppercase; letter-spacing: .12em; }
.head h2 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); letter-spacing: -.02em; line-height: 1.15; margin: 8px 0 12px; }
.head p { color: var(--muted); }

/* Problem/solution */
.split { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.card .ic {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-size: 1.4rem; margin-bottom: 14px;
}
.card h3 { font-size: 1.12rem; margin-bottom: 6px; }
.card p { color: var(--muted); font-size: .97rem; }
.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 18px; }
.features .card { box-shadow: none; transition: transform .2s, box-shadow .2s; }
.features .card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

/* Screenshots */
.alt { background: var(--surface); border-block: 1px solid var(--line); }
.shots {
  display: flex; gap: 18px; overflow-x: auto; scroll-snap-type: x mandatory;
  padding: 6px 16px 22px; margin-inline: -16px; scrollbar-width: thin;
}
.shots img {
  flex: 0 0 auto; width: 240px; border-radius: 22px; scroll-snap-align: center;
  box-shadow: var(--shadow); border: 1px solid var(--line);
}
@media (max-width: 560px) { .shots img { width: 72vw; } }

/* Audience */
.who { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; }
.who div { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px; font-weight: 700; text-align: center; }
.who div span { display: block; font-size: 1.7rem; margin-bottom: 6px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: s; }
.steps .card { box-shadow: none; }
.steps .card::before {
  counter-increment: s; content: counter(s);
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%;
  background: var(--navy); color: var(--bolt); font-weight: 800; margin-bottom: 12px;
}
@media (max-width: 860px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* FAQ */
.faq { max-width: 800px; margin: 0 auto; display: grid; gap: 12px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px 22px; }
.faq summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::after { content: "+"; font-size: 1.3rem; line-height: 1; color: var(--green); }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--muted); margin-top: 10px; }

/* CTA band */
.band { background: var(--grad); color: #fff; border-radius: 28px; padding: 56px 32px; text-align: center; }
.band h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -.02em; margin-bottom: 10px; }
.band p { opacity: .92; max-width: 600px; margin: 0 auto 26px; }
.note { font-size: .88rem; color: var(--muted); text-align: center; max-width: 760px; margin: 28px auto 0; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 36px 0; color: var(--muted); font-size: .92rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer a { text-decoration: none; }
footer a:hover { color: var(--text); }

/* Sticky mobile CTA */
.mcta { display: none; }
@media (max-width: 640px) {
  .mcta {
    display: flex; position: fixed; left: 16px; right: 16px; bottom: 14px; z-index: 60;
    justify-content: center; background: var(--grad); color: #fff; font-weight: 800;
    padding: 14px; border-radius: 16px; text-decoration: none; box-shadow: 0 10px 30px rgba(0,0,0,.3);
  }
  footer { padding-bottom: 96px; }
}

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } html { scroll-behavior: auto; } }