:root{
  --bg: #0b1220;
  --text: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --soft: #f1f5f9;
  --primary: #0ea5e9;
  --primary2: #0284c7;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(2,8,23,.08);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Noto Sans Bengali", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:#fff;
  line-height:1.6;
}

a{color:inherit; text-decoration:none}
img{max-width:100%; display:block}

.container{
  width:min(1120px, calc(100% - 32px));
  margin:0 auto;
}

/* Header */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter: blur(8px);
  border-bottom:1px solid rgba(15,23,42,.06);
}
.header-row{
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 0;
}
.brand{
  display:flex; gap:10px; align-items:center;
  font-weight:800;
}
.brand-mark{
  width:34px; height:34px; border-radius:10px;
  display:grid; place-items:center;
  background:var(--soft);
}
.nav{
  display:flex; gap:18px; align-items:center;
}
.nav-link{
  font-weight:600;
  color:#0f172a;
  opacity:.9;
}
.nav-link:hover{color:var(--primary2)}
.nav-toggle{
  display:none;
  border:0; background:transparent;
  font-size:20px; padding:10px;
}

/* Hero */
.hero{
  position:relative;
  min-height:72vh;
  display:grid;
  align-items:center;
}
.hero-bg{
  position:absolute; inset:0;
  background-size:cover;
  background-position:center;
}
.hero-overlay{
  position:absolute; inset:0;
  background:linear-gradient(90deg, rgba(2,6,23,.75), rgba(2,6,23,.35));
}
.hero-content{
  position:relative;
  padding:72px 0;
  color:#fff;
  max-width:760px;
}
.hero-title{
  font-size:clamp(30px, 4.2vw, 54px);
  line-height:1.15;
  margin:0 0 14px 0;
  font-weight:800;
}
.hero-subtitle{
  margin:0 0 26px 0;
  color:rgba(255,255,255,.85);
  font-size:clamp(14px, 1.4vw, 18px);
}
.hero-actions{display:flex; gap:12px; flex-wrap:wrap}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 18px;
  border-radius:999px;
  font-weight:700;
  border:1px solid transparent;
  transition:.2s ease;
}
.btn-primary{
  background:var(--primary);
  color:#fff;
}
.btn-primary:hover{background:var(--primary2)}
.btn-ghost{
  background:rgba(255,255,255,.10);
  border-color:rgba(255,255,255,.22);
  color:#fff;
}
.btn-ghost:hover{background:rgba(255,255,255,.16)}

/* Sections */
.section{padding:70px 0}
.section-alt{background:#f8fafc}
.section-head{margin-bottom:26px}
.section-title{
  margin:0 0 8px 0;
  font-size:clamp(22px, 2.6vw, 32px);
  font-weight:800;
}
.section-subtitle{margin:0; color:var(--muted)}

/* Grid */
.grid{display:grid; gap:18px}
.grid-3{grid-template-columns:repeat(3, 1fr)}

/* Cards */
.card{
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  border:1px solid rgba(15,23,42,.06);
  overflow:hidden;
}
.icon-card{padding:18px}
.icon{
  width:48px; height:48px;
  border-radius:14px;
  display:grid; place-items:center;
  background:var(--soft);
  color:var(--primary2);
  font-size:20px;
  margin-bottom:12px;
}
.icon-card h3{margin:0 0 6px 0; font-size:18px; line-height:1.35}
.icon-card p{margin:0; color:var(--muted)}

/* Split layout */
.split{
  display:grid;
  gap:22px;
  grid-template-columns: 1.15fr .85fr;
  align-items:center;
}
.split-media img{
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  border:1px solid rgba(15,23,42,.06);
}
.split-content p{color:var(--muted)}

/* Stats */
.stats{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(3, 1fr);
}
.stat{
  padding:16px;
  border-radius:var(--radius);
  background:var(--soft);
  border:1px solid rgba(15,23,42,.06);
}
.stat-num{
  font-weight:900;
  font-size:26px;
  line-height:1.1;
}
.stat-label{color:var(--muted); font-weight:700; margin-top:6px}

/* News */
.news-card img{height:190px; width:100%; object-fit:cover}
.card-body{padding:16px}
.card-body h3{margin:0 0 6px 0; font-size:18px}
.card-body p{margin:0 0 12px 0; color:var(--muted)}
.link{color:var(--primary2); font-weight:800}
.link i{margin-left:6px}

/* Footer */
.footer{
  background:#0b1220;
  color:rgba(255,255,255,.88);
  padding:48px 0 18px 0;
}
.footer-grid{
  display:grid;
  gap:18px;
  grid-template-columns: 1fr 1fr 1fr;
}
.footer h4{margin:0 0 10px 0; color:#fff}
.footer a{display:block; padding:6px 0; color:rgba(255,255,255,.78)}
.footer a:hover{color:#fff}
.social{display:flex; gap:10px; margin-top:10px}
.social a{
  width:38px; height:38px; border-radius:12px;
  display:grid; place-items:center;
  background:rgba(255,255,255,.08);
}
.social a:hover{background:rgba(255,255,255,.14)}
.footer-bottom{
  margin-top:22px;
  padding-top:14px;
  border-top:1px solid rgba(255,255,255,.10);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}
.backtop{font-weight:800}

/* Responsive */
@media (max-width: 960px){
  .grid-3{grid-template-columns:repeat(2, 1fr)}
  .split{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(3, 1fr)}
}
@media (max-width: 640px){
  .grid-3{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .nav{display:none; position:absolute; right:16px; top:60px;
    flex-direction:column; gap:10px;
    background:#fff; color:#0f172a;
    padding:14px; border-radius:16px;
    box-shadow:var(--shadow);
    border:1px solid rgba(15,23,42,.06);
    min-width: 180px;
  }
  .nav.show{display:flex}
  .nav-toggle{display:inline-flex}
}