:root {
  --bg: #050806;
  --panel: #0c1410;
  --panel-2: #111a15;
  --green: #00c46a;
  --green-dim: #006a4e;
  --red: #f42a41;
  --text: #e8f3ec;
  --muted: #8aa396;
  --line: rgba(255,255,255,.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: "Noto Sans Bengali", "Kalpurush", system-ui, sans-serif;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(0,196,106,.16), transparent 55%),
    radial-gradient(700px 400px at 10% 110%, rgba(244,42,65,.1), transparent 50%),
    var(--bg);
  color: var(--text);
}
a { color: var(--green); }
header.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 6vw;
  border-bottom: 1px solid var(--line);
  background: rgba(5,8,6,.86);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.top img.brand { height: 48px; width: auto; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
}
nav a:hover, nav a.active { color: var(--text); }
.btn {
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  font-size: 15px;
  text-decoration: none;
  display: inline-block;
}
.btn-primary { background: linear-gradient(90deg, var(--green-dim), var(--green)); color: #04110a; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid rgba(255,255,255,.14); }
.hdr-cta { padding: 8px 12px; font-size: 13px; }
@media (max-width: 800px) {
  nav { display: none; }
  header.top img.brand { height: 40px; }
}