:root{--bg:#ffffff;--text:#1d232a;--muted:#6b7280;--brand:#0ea5e9;--card:#f8fafc;--border:#e5e7eb;}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Noto Sans Bengali","Hind Siliguri","SolaimanLipi",sans-serif;line-height:1.65;color:var(--text);background:var(--bg)}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:940px;margin:0 auto;padding:0 16px}
header{position:sticky;top:0;background:rgba(255,255,255,0.9);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--border);z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{font-weight:700;font-size:1.05rem}
nav a{margin-left:14px;color:var(--text)}
main{padding:18px 0}
.grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:720px){.grid{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:transform .1s ease}
.card:hover{transform:translateY(-2px)}
.card img{display:block;width:100%;height:200px;object-fit:cover;background:#eef2f7}
.card .p{padding:14px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 14px;border-radius:8px}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
footer{margin-top:40px;border-top:1px solid var(--border);padding:28px 0;color:var(--muted);font-size:.95rem}
.small{font-size:.95rem;color:var(--muted)}
.article h1{font-size:2rem;margin:.2em 0 .4em}
.article img{width:100%;height:auto;border-radius:12px;border:1px solid var(--border);}
.article figure{margin:0 0 12px}
.article p{margin:12px 0}
.hl{position:sticky;top:48px;background:#111827;color:#f9fafb;padding:10px 12px;text-align:center;border-bottom:2px solid #0ea5e9}
.hl a{color:#60a5fa;font-weight:700}
/* animation */
@media (prefers-reduced-motion: no-preference){
  .hl span{display:inline-block;animation:slidefade 2.8s ease-in-out infinite}
  @keyframes slidefade{0%{opacity:.6;transform:translateY(0)}50%{opacity:1;transform:translateY(-2px)}100%{opacity:.6;transform:translateY(0)}}
}
.skip{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip:focus{left:8px;top:8px;width:auto;height:auto;padding:8px;background:#fff;border:2px solid #000;z-index:100}
figure figcaption{font-size:.9rem;color:var(--muted);margin-top:6px}
input,textarea{width:100%;padding:10px;border:1px solid var(--border);border-radius:8px}
form .row{display:grid;gap:12px}
form button{margin-top:6px}