:root{--bg:#0b0f1a;--card:#121829;--muted:#8a93a8;--text:#eef1f7;--accent:#7c5cff;--accent2:#00d4ff;--ok:#22c55e;--err:#ef4444;--border:#1f2740}
  *{box-sizing:border-box;margin:0;padding:0}
  body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Bengali",sans-serif;background:radial-gradient(1200px 600px at 50% -10%,#1b2140 0%,var(--bg) 60%);color:var(--text);min-height:100vh}
  header{display:flex;justify-content:space-between;align-items:center;padding:20px 5%;max-width:1100px;margin:auto}
  .logo{font-weight:800;font-size:1.4rem;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
  nav a{color:var(--muted);text-decoration:none;margin-left:20px;font-size:.95rem}
  nav a:hover{color:var(--text)}
  .hero{text-align:center;padding:50px 5% 20px;max-width:820px;margin:auto}
  h1{font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.2;margin-bottom:12px}
  h1 span{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
  .sub{color:var(--muted);font-size:1.05rem;margin-bottom:28px}
  .platforms{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
  .chip{display:flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--border);padding:8px 14px;border-radius:999px;font-size:.9rem;color:var(--muted)}
  .chip svg{width:18px;height:18px}
  .box{display:flex;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:8px;box-shadow:0 20px 60px rgba(0,0,0,.4)}
  .box input{flex:1;background:transparent;border:none;outline:none;color:var(--text);font-size:1.05rem;padding:14px 16px}
  .box input::placeholder{color:#5c6480}
  .btn{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#fff;border:none;border-radius:12px;padding:0 26px;font-weight:700;font-size:1rem;cursor:pointer;transition:.2s;white-space:nowrap}
  .btn:hover{filter:brightness(1.1);transform:translateY(-1px)}
  .btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
  .btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}
  .paste{background:transparent;border:1px solid var(--border);color:var(--muted);border-radius:10px;padding:0 14px;cursor:pointer;font-size:.9rem;white-space:nowrap}
.box .inrow{display:contents}
  .paste:hover{color:var(--text)}
  .msg{margin-top:14px;font-size:.95rem;min-height:22px}
  .msg.err{color:var(--err)}.msg.ok{color:var(--ok)}
  .loader{display:inline-block;width:18px;height:18px;border:3px solid #ffffff33;border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite;vertical-align:middle}
  @keyframes spin{to{transform:rotate(360deg)}}
  /* result */
  .result{max-width:820px;margin:30px auto;padding:0 5%;display:none}
  .card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:20px;display:grid;grid-template-columns:200px 1fr;gap:20px}
  @media(max-width:600px){.card{grid-template-columns:1fr}}
  .thumb{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:12px;background:#000}
  .title{font-weight:700;font-size:1.1rem;margin-bottom:6px;line-height:1.35}
  .meta{color:var(--muted);font-size:.9rem;margin-bottom:16px}
  .badge{display:inline-block;background:#1e2a4a;color:var(--accent2);border-radius:6px;padding:2px 8px;font-size:.75rem;margin-left:6px;vertical-align:middle}
  .badge.nw{background:#153a2a;color:var(--ok)}
  .opts{display:flex;flex-direction:column;gap:8px}
  .opt{display:flex;justify-content:space-between;align-items:center;background:#0e1424;border:1px solid var(--border);border-radius:10px;padding:10px 14px}
  .opt .l{font-weight:600}.opt .s{color:var(--muted);font-size:.85rem;margin-left:8px}
  .opt button{padding:8px 16px;font-size:.9rem;border-radius:8px}
  .opt.audio{border-color:#2a3a2a}
  /* progress */
  .prog{margin-top:16px;display:none}
  .bar{height:10px;background:#0e1424;border-radius:99px;overflow:hidden;border:1px solid var(--border)}
  .bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .3s}
  .ptxt{font-size:.9rem;color:var(--muted);margin-top:8px;display:flex;justify-content:space-between}
  .dlbtn{display:block;margin-top:12px;text-align:center;text-decoration:none;padding:14px;font-size:1.05rem}
  /* features */
  .features{max-width:1100px;margin:60px auto;padding:0 5%;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
  .f{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px}
  .f h3{font-size:1.05rem;margin-bottom:8px}.f p{color:var(--muted);font-size:.92rem;line-height:1.5}
  .f .ic{font-size:1.6rem;margin-bottom:10px}
  .how{max-width:820px;margin:20px auto 60px;padding:0 5%}
  .how h2{text-align:center;margin-bottom:24px}
  .steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
  .step{text-align:center;color:var(--muted);font-size:.95rem}
  .step b{display:block;width:40px;height:40px;line-height:40px;border-radius:50%;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#fff;margin:0 auto 10px;font-size:1.1rem}
  footer{text-align:center;color:#5c6480;font-size:.85rem;padding:30px 5%;border-top:1px solid var(--border)}

/* ---- layout additions ---- */
header.top{display:flex;justify-content:space-between;align-items:center;padding:20px 5%;max-width:1100px;margin:auto}
.logo{text-decoration:none}
footer a{color:var(--muted)}
.ad-box{text-align:center;margin:18px auto;min-height:0}
.ad-box.wrap{max-width:820px;padding:0 5%}
.ad-label{display:block;font-size:.65rem;letter-spacing:.1em;color:#4b5470;text-transform:uppercase;margin-bottom:4px}
/* blog */
.wrap{max-width:820px;margin:auto;padding:0 5%}
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px;margin:30px 0}
.post-card{background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;text-decoration:none;color:var(--text);display:flex;flex-direction:column;transition:.2s}
.post-card:hover{transform:translateY(-3px);border-color:var(--accent)}
.post-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:#0e1424}
.post-card .pc{padding:16px}.post-card h3{font-size:1.02rem;margin-bottom:8px;line-height:1.35}
.post-card p{color:var(--muted);font-size:.88rem;line-height:1.5}.post-card small{color:#5c6480;display:block;margin-top:10px}
.article{max-width:760px;margin:30px auto;padding:0 5%}
.article h1{font-size:2rem;margin:10px 0 8px}
.article .meta{color:var(--muted);font-size:.9rem;margin-bottom:24px}
.article img.cover{width:100%;border-radius:14px;margin-bottom:24px}
.prose{line-height:1.75;font-size:1.05rem;color:#d5dae6}
.prose h2{margin:30px 0 12px;font-size:1.5rem;color:var(--text)}.prose h3{margin:24px 0 10px;font-size:1.2rem;color:var(--text)}
.prose p{margin-bottom:16px}.prose ul,.prose ol{margin:0 0 16px 24px}.prose li{margin-bottom:6px}
.prose a{color:var(--accent2)}.prose img{max-width:100%;border-radius:10px}
.prose code{background:#0e1424;padding:2px 6px;border-radius:5px;font-size:.9em}.prose pre{background:#0e1424;padding:14px;border-radius:10px;overflow:auto;margin-bottom:16px}
.prose blockquote{border-left:3px solid var(--accent);padding-left:14px;color:var(--muted);margin:0 0 16px}
.prose table{border-collapse:collapse;width:100%;margin-bottom:16px}.prose td,.prose th{border:1px solid var(--border);padding:8px}
.pager{display:flex;gap:10px;justify-content:center;margin:20px 0 50px}
.pager a{padding:8px 14px;border:1px solid var(--border);border-radius:8px;color:var(--text);text-decoration:none}
.cta{background:linear-gradient(135deg,#1b2140,#121829);border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center;margin:30px 0}
.cta a{display:inline-block;margin-top:10px}
h2.sec{text-align:center;margin:50px 0 10px}
.center{text-align:center}

.logo{display:flex;align-items:center;gap:8px}.logo-img{height:38px;max-width:200px;object-fit:contain}
.ad-box.banner img{max-width:100%;height:auto;border-radius:10px;display:block;margin:auto}
.ad-box.banner a{display:block}
footer .flinks{margin-bottom:8px}footer .flinks a{margin:0 10px;color:var(--muted);text-decoration:none}footer .flinks a:hover{color:var(--text)}
footer .credit{margin-top:8px;font-size:.8rem}footer .credit a{color:var(--accent2);text-decoration:none;font-weight:600}

#ready .alt{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:10px}
#ready .btn.sm{padding:8px 14px;font-size:.85rem;text-decoration:none}
#ready .hint{color:var(--muted);font-size:.8rem;margin-top:10px;text-align:center;line-height:1.5}

/* ================= MOBILE RESPONSIVE ================= */
html{-webkit-text-size-adjust:100%}
img,video{max-width:100%}
@media (max-width:768px){
  header.top{padding:14px 4%;flex-wrap:wrap;gap:8px}
  header.top nav{display:flex;gap:4px;width:100%;justify-content:center;flex-wrap:wrap}
  header.top nav a{margin:0;padding:6px 10px;font-size:.88rem;background:var(--card);border:1px solid var(--border);border-radius:999px}
  .logo{font-size:1.2rem}.logo-img{height:32px}
  .hero{padding:26px 4% 10px}
  h1{font-size:1.75rem}
  .sub{font-size:.95rem;margin-bottom:18px}
  .platforms{gap:8px;margin-bottom:18px}
  .chip{padding:6px 10px;font-size:.8rem}.chip svg{width:15px;height:15px}
  .chip .badge{display:none}
  /* search box stacks vertically */
  .box{flex-direction:column;padding:10px;border-radius:14px;gap:8px}
  .box input{width:100%;font-size:16px;padding:13px 12px;border:1px solid var(--border);border-radius:10px;background:#0e1424}
  .box .inrow{display:flex;gap:8px;width:100%}
  .box .inrow input{flex:1;min-width:0}
  .box .paste{display:flex;align-items:center;justify-content:center;gap:6px;padding:0 14px;border-radius:10px;font-size:.9rem;white-space:nowrap;background:#0e1424;color:var(--text)}
  .box .btn{width:100%;padding:14px;font-size:1.05rem}
  .msg{font-size:.9rem}
  .result{padding:0 4%;margin:18px auto}
  .card{padding:14px;gap:14px;border-radius:14px}
  .thumb{aspect-ratio:16/9}
  .title{font-size:1rem}
  .opt{padding:10px 12px;flex-wrap:wrap;gap:8px}
  .opt .l{font-size:.95rem}.opt .s{display:block;margin:2px 0 0;font-size:.8rem}
  .opt button{padding:9px 14px;font-size:.88rem;min-width:100px}
  .dlbtn{padding:15px;font-size:1.05rem}
  #ready .alt{gap:6px}#ready .btn.sm{flex:1 1 30%;text-align:center;padding:10px 6px;font-size:.8rem}
  .how{margin:10px auto 30px;padding:0 4%}.how h2{font-size:1.4rem;margin-bottom:14px}
  .steps{grid-template-columns:1fr;gap:10px}
  .step{display:flex;align-items:center;gap:12px;text-align:left;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px}
  .step b{margin:0;flex-shrink:0}
  .features{margin:26px auto;padding:0 4%;gap:12px;grid-template-columns:1fr 1fr}
  .f{padding:14px}.f .ic{font-size:1.3rem;margin-bottom:6px}.f h3{font-size:.95rem}.f p{font-size:.82rem}
  h2.sec{margin:26px 0 6px;font-size:1.4rem}
  .blog-grid{grid-template-columns:1fr;gap:12px}
  .article{margin:14px auto}.article h1{font-size:1.5rem}
  .prose{font-size:1rem}
  footer{padding:20px 4% calc(20px + env(safe-area-inset-bottom));font-size:.8rem;line-height:1.7}
  footer .flinks a{margin:0 6px}
  .ad-box.wrap{padding:0 4%}
}
@media (max-width:380px){
  h1{font-size:1.5rem}
  .features{grid-template-columns:1fr}
  .platforms .chip span{display:none}
}
/* touch targets */
@media (hover:none){
  .btn:hover{transform:none}
  button,.btn,a.btn{min-height:44px}
}

/* ================= STICKY HEADER ================= */
header.top{position:sticky;top:0;z-index:100;max-width:none;width:100%;
  background:rgba(11,15,26,.85);backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid transparent;transition:border-color .2s,box-shadow .2s}
header.top .inner{max-width:1100px;margin:auto;display:flex;justify-content:space-between;align-items:center;width:100%}
header.top.scrolled{border-bottom-color:var(--border);box-shadow:0 8px 30px rgba(0,0,0,.35)}
header.top nav a{transition:color .15s}
@media (max-width:768px){
  header.top{padding:10px 4%}
  header.top .inner{flex-wrap:nowrap;gap:8px}
  header.top nav{width:auto;justify-content:flex-end;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  header.top nav::-webkit-scrollbar{display:none}
  header.top nav a{padding:5px 9px;font-size:.8rem;flex-shrink:0}
}
/* anchor targets shouldn't hide under the sticky bar */
#how,#features{scroll-margin-top:80px}