:root{
  --ink:#14434d;--ink-2:#3d6670;--bg:#effcfd;--cyan-100:#c2f2f4;--cyan-200:#9fe6ea;--cyan-600:#0e8fa3;--cyan-700:#0e7490;--cyan-800:#0b5d74;
  --emerald:#007a43;--gold:#c8a24a;--card:#fff;--line:#cfe9ec;--danger:#b42318;--ok:#067647;
  --r:16px;--sh:0 6px 22px rgba(20,67,77,.10);--max:1120px;
  --font:system-ui,-apple-system,"Segoe UI","Noto Sans Bengali","Kohinoor Bangla","Nirmala UI",Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;min-height:100vh}
/* faint hexagon pattern, fades toward the centre */
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.07;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='98' viewBox='0 0 28 49'%3E%3Cpath d='M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5z' fill='none' stroke='%230e7490' stroke-width='1'/%3E%3C/svg%3E") 0 0/56px 98px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 40%,transparent 25%,#000 90%);mask-image:radial-gradient(ellipse at 50% 40%,transparent 25%,#000 90%)}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan-700)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
h1{font-size:clamp(1.6rem,5vw,2.6rem)}
h2{font-size:clamp(1.4rem,3.6vw,2rem)}
h3{font-size:1.1rem}
p{margin:0 0 1em}
.wrap{width:min(100% - 32px,var(--max));margin-inline:auto}
section{padding:44px 0}
.sec-head{text-align:center;margin-bottom:26px}
.sec-head p{color:var(--ink-2);max-width:60ch;margin-inline:auto}
.sec-head h2::after{content:"";display:block;width:56px;height:3px;border-radius:3px;margin:10px auto 0;background:linear-gradient(90deg,var(--cyan-600),var(--gold))}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 12px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
:focus-visible{outline:3px solid var(--cyan-600);outline-offset:2px;border-radius:6px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:10px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:1.08rem;margin-inline-end:auto}
.brand img{width:42px;height:42px;border-radius:10px}
.lang{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:#fff}
.lang button{border:0;background:none;padding:7px 12px;font:inherit;font-size:.9rem;cursor:pointer;color:var(--ink)}
.lang button[aria-pressed=true]{background:var(--cyan-700);color:#fff}
.menu-btn{border:1px solid var(--line);background:#fff;border-radius:10px;width:44px;height:44px;font-size:1.3rem;cursor:pointer;color:var(--ink)}
.nav{position:absolute;inset-inline:0;top:64px;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--sh);display:none}
.nav.open{display:block}
.nav a{display:block;padding:14px 20px;text-decoration:none;color:var(--ink);font-weight:600;border-top:1px solid var(--line)}
.nav a:hover,.nav a:focus-visible{background:var(--cyan-100)}
.nav .cta{background:var(--cyan-700);color:#fff}
@media (min-width:900px){
  .menu-btn{display:none}
  .nav{position:static;display:flex;gap:2px;border:0;box-shadow:none;background:none}
  .nav a{border:0;padding:8px 12px;border-radius:999px;font-size:.95rem}
  .brand{margin-inline-end:0}.hdr .wrap{gap:14px}.nav{margin-inline-start:auto}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border-radius:999px;border:2px solid var(--cyan-700);background:var(--cyan-700);color:#fff;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--cyan-800);border-color:var(--cyan-800)}
.btn.ghost{background:#fff;color:var(--cyan-700)}.btn.ghost:hover{background:var(--cyan-100)}
.btn.wa{background:#0b7a4b;border-color:#0b7a4b}.btn.wa:hover{background:#075c38;border-color:#075c38}
.btn[disabled]{opacity:.6;cursor:wait}
.btn.sm{min-height:38px;padding:6px 16px;font-size:.92rem}

/* hero */
.hero{padding-top:20px}
.hero-pic{border-radius:22px;overflow:hidden;box-shadow:var(--sh);background:var(--cyan-100)}
.hero-pic img{width:100%;aspect-ratio:2576/1438;object-fit:cover}
.hero-txt{text-align:center;padding:26px 0 0}
.hero-txt p{color:var(--ink-2);max-width:56ch;margin:0 auto 18px;font-size:1.05rem}

/* slider */
.slider{position:relative;border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);background:#fff}
.track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.track::-webkit-scrollbar{display:none}
.slide{flex:0 0 100%;scroll-snap-align:start;position:relative}
.slide img{width:100%;aspect-ratio:1200/630;object-fit:cover}
.cap{position:absolute;inset-inline:0;bottom:0;padding:34px 18px 16px;color:#fff;background:linear-gradient(transparent,rgba(5,35,45,.82))}
.cap h3{margin:0 0 4px;font-size:1.2rem}.cap p{margin:0 0 8px;font-size:.95rem}
.sl-ctl{display:flex;align-items:center;justify-content:center;gap:10px;padding:10px;background:#fff}
.sl-ctl button{border:1px solid var(--line);background:#fff;border-radius:50%;width:40px;height:40px;cursor:pointer;color:var(--ink);font-size:1.1rem}
.dots{display:flex;gap:8px}.dots i{width:9px;height:9px;border-radius:50%;background:var(--cyan-200)}.dots i.on{background:var(--cyan-700)}

/* cards & grids */
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh);padding:18px}
.prod{display:flex;flex-direction:column;gap:8px;position:relative;padding:0;overflow:hidden}
.prod .ph{aspect-ratio:4/3;display:grid;place-items:center;font-size:3rem;background:linear-gradient(135deg,var(--cyan-100),#e6fbf3);position:relative}
.prod .ph img{width:100%;height:100%;object-fit:cover}
.badge{position:absolute;top:12px;inset-inline-start:12px;background:var(--gold);color:#3b2a00;font-size:.78rem;font-weight:800;padding:3px 11px;border-radius:999px}
.badge.ok{background:var(--emerald);color:#fff}
.prod .body{padding:4px 16px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.prod .body p{color:var(--ink-2);font-size:.93rem;margin:0}
.prod .soon{font-size:.85rem;color:#7a5b00;font-weight:600}
.prod .act{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto;padding-top:8px}
.price{font-weight:700}

.gal{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
.gal button{padding:0;border:0;background:none;cursor:zoom-in;border-radius:12px;overflow:hidden}
.gal img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .25s}
.gal button:hover img{transform:scale(1.04)}
dialog{border:0;border-radius:var(--r);padding:0;max-width:min(92vw,720px);width:100%;box-shadow:0 20px 60px rgba(0,0,0,.35);color:var(--ink)}
dialog::backdrop{background:rgba(5,35,45,.7)}
.dlg-x{position:absolute;top:8px;inset-inline-end:8px;border:0;background:#fff;border-radius:50%;width:38px;height:38px;font-size:1.2rem;cursor:pointer;box-shadow:var(--sh)}
.lb img{width:100%;max-height:80vh;object-fit:contain;background:#000}
.lb p{margin:0;padding:10px 16px}
.dev{padding:28px 22px;text-align:center}.dev img{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 12px;border:3px solid var(--cyan-200)}
.dev p{margin:.2em 0}

.video{max-width:800px;margin:auto}
.vbox{position:relative;aspect-ratio:16/9;border-radius:var(--r);overflow:hidden;background:linear-gradient(135deg,var(--cyan-100),#d9f7e8);box-shadow:var(--sh);display:grid;place-items:center;text-align:center}
.vbox iframe,.vbox img{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:cover}
.play{position:absolute;border:0;background:rgba(14,116,144,.92);color:#fff;width:72px;height:72px;border-radius:50%;font-size:1.7rem;cursor:pointer}

.why{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.why .ic{font-size:2rem}
.about{display:grid;gap:24px;align-items:center}
.about img{border-radius:var(--r);background:#fff;border:1px solid var(--line);box-shadow:var(--sh);max-width:300px;margin:auto}
@media (min-width:800px){.about{grid-template-columns:300px 1fr}}

/* forms */
.form{max-width:680px;margin:auto}
.fld{margin-bottom:14px}
label{display:block;font-weight:600;margin-bottom:5px;font-size:.95rem}
input,select,textarea{width:100%;padding:11px 12px;border:1.5px solid var(--line);border-radius:12px;background:#fff;font:inherit;color:var(--ink)}
textarea{min-height:92px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:3px solid var(--cyan-200);border-color:var(--cyan-600)}
.err{color:var(--danger);font-size:.85rem;min-height:1.1em;margin-top:3px}
.row2{display:grid;gap:14px}@media (min-width:600px){.row2{grid-template-columns:1fr 140px}}
.hp{position:absolute;inset-inline-start:-9999px;width:1px;height:1px;opacity:0}
.note{font-size:.88rem;color:var(--ink-2)}
.result{margin-top:18px;border:2px solid var(--emerald);background:#f1fbf6;border-radius:var(--r);padding:18px}
.result.bad{border-color:var(--danger);background:#fff5f4}
.result pre{white-space:pre-wrap;font:inherit;background:#fff;border:1px dashed var(--line);border-radius:10px;padding:10px;margin:10px 0}
.contact{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.clist{list-style:none;padding:0;margin:0 0 12px}.clist li{padding:6px 0}

/* footer */
.ftr{background:var(--ink);color:#e3f6f8;padding:34px 0 22px;margin-top:20px}
.ftr a{color:#bff1f5}
.ftr nav{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:14px}
.ftr .small{font-size:.88rem;opacity:.9}
.ftr button.link{background:none;border:0;color:#bff1f5;font:inherit;text-decoration:underline;cursor:pointer;padding:0}
.doc{max-width:760px;margin:30px auto;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;white-space:pre-line}
.prod .stretch{color:inherit;text-decoration:none}
.prod .stretch::after{content:"";position:absolute;inset:0;z-index:1}
.prod .act a{position:relative;z-index:2}
.brand span{white-space:nowrap}
@media (max-width:420px){.brand{font-size:.95rem;gap:7px}.brand img{width:36px;height:36px}.hdr .wrap{gap:7px}.lang button{padding:7px 9px}}
@media (max-width:599px){
  #prodGrid{grid-template-columns:repeat(2,1fr);gap:10px}
  .prod .ph{aspect-ratio:1/1;font-size:2.4rem}
  .prod .body{padding:2px 10px 12px}
  .prod h3{font-size:.98rem}.prod .body p{font-size:.84rem}
  .prod .act{flex-direction:column}.prod .act .btn{width:100%;padding:6px 8px;font-size:.85rem}
  .badge{font-size:.7rem;padding:2px 8px;top:8px;inset-inline-start:8px}
}