:root{--navy:#0d2e51;--navy-2:#163f6b;--green:#0a8a47;--green-2:#0b7a40;--wa:#1fa855;--ink:#1b2430;--muted:#5a6573;--line:#e3e7ec;--bg:#fff;--soft:#f4f7f9;--cream:#f6f5f1;--radius:14px;--max:1160px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font:17px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans Bengali","Hind Siliguri",sans-serif;color:var(--ink);background:var(--bg)}
img{max-width:100%;height:auto}
a{color:var(--navy-2)}
a:hover{color:var(--green)}
h1,h2,h3{line-height:1.25;color:var(--navy);letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.2vw,2.9rem);margin:.2em 0 .35em}
h2{font-size:clamp(1.4rem,2.6vw,1.85rem);margin:2.2em 0 .6em}
h3{font-size:1.15rem;margin:1.4em 0 .4em}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:#fff;padding:8px 12px;z-index:99}
/* header */
.top{background:var(--navy);color:#cfd9e4;font-size:.85rem}
.top .wrap{display:flex;gap:18px;justify-content:flex-end;align-items:center;min-height:36px;flex-wrap:wrap}
.top a{color:#fff;text-decoration:none}
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:20px;min-height:72px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);margin-right:auto}
.brand img{width:48px;height:48px}
.brand b{display:block;font-size:1.12rem;line-height:1.1}
.brand small{display:block;color:var(--green);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;font-weight:600}
nav.main{display:flex;gap:4px;align-items:center}
nav.main>a,nav.main details>summary{padding:8px 12px;border-radius:8px;text-decoration:none;color:var(--ink);font-weight:500;font-size:.98rem;cursor:pointer;list-style:none}
nav.main details>summary::-webkit-details-marker{display:none}
nav.main>a:hover,nav.main details>summary:hover{background:var(--soft);color:var(--navy)}
nav.main details{position:relative}
.mega{position:absolute;right:-240px;top:calc(100% + 10px);width:min(860px,94vw);background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 20px 50px rgba(13,46,81,.15);padding:18px;display:grid;grid-template-columns:repeat(3,1fr);gap:4px 14px}
.mega a{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:var(--ink);font-size:.93rem;line-height:1.35}
.mega a:hover{background:var(--soft)}
.mega a span{display:block;color:var(--muted);font-size:.8rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:999px;font-weight:600;text-decoration:none;border:2px solid transparent;line-height:1.2;font-size:1rem;cursor:pointer;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px)}
.btn-wa{background:var(--wa);color:#fff}.btn-wa:hover{color:#fff;box-shadow:0 8px 22px rgba(31,168,85,.35)}
.btn-navy{background:var(--navy);color:#fff}.btn-navy:hover{color:#fff;background:var(--navy-2)}
.btn-ghost{border-color:currentColor;color:var(--navy);background:transparent}
.btn-light{background:#fff;color:var(--navy)}
.btn svg{width:20px;height:20px;flex:none}
.menu-toggle{display:none}
/* hero */
.hero{background:linear-gradient(135deg,var(--navy) 0%,#123d68 60%,#0e4c55 100%);color:#e8eef5;padding:64px 0 72px;position:relative;overflow:hidden}
.hero h1,.hero h2{color:#fff}
.hero .eyebrow{color:#7fe0a8}
.hero p.lead{font-size:1.15rem;max-width:640px;color:#d6e0ea}
.hero .grid{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center}
.hero .badge-logo{background:var(--cream);border-radius:50%;padding:28px;max-width:340px;margin-left:auto;box-shadow:0 30px 60px rgba(0,0,0,.25)}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:700;color:var(--green)}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.ticks{display:flex;flex-wrap:wrap;gap:8px 20px;margin:22px 0 0;padding:0;list-style:none;font-size:.93rem}
.ticks li::before{content:"✓ ";color:#7fe0a8;font-weight:700}
/* page head */
.phead{background:var(--soft);border-bottom:1px solid var(--line);padding:26px 0 34px}
.crumbs{font-size:.85rem;color:var(--muted);margin:0 0 6px;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"›";margin-right:6px;color:#9aa5b1}
.crumbs a{color:var(--muted);text-decoration:none}
.tagline{font-size:1.12rem;color:var(--muted);max-width:760px}
/* layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;padding:36px 20px 60px}
article.content{min-width:0}
article.content ul,article.content ol{padding-left:1.3em;margin:0 0 1.2em}
article.content li{margin:.3em 0}
.answer{background:#eef8f2;border-left:4px solid var(--green);padding:18px 20px;border-radius:10px;margin:0 0 26px}
.answer strong{display:block;color:var(--green-2);font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:4px}
.answer p{margin:0}
.toc{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:0 0 10px;font-size:.95rem}
.toc summary{font-weight:600;cursor:pointer;color:var(--navy)}
.toc ol{margin:8px 0 0}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding:0 0 18px 58px;margin:0!important}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700}
.steps li:not(:last-child)::after{content:"";position:absolute;left:19px;top:44px;bottom:4px;width:2px;background:var(--line)}
.steps b{display:block;color:var(--navy)}
.help{display:grid;grid-template-columns:1fr 1fr;gap:10px;list-style:none;padding:0!important}
.help li{background:var(--soft);border-radius:10px;padding:12px 14px 12px 40px;position:relative;margin:0!important;font-size:.96rem}
.help li::before{content:"✓";position:absolute;left:14px;top:11px;color:var(--green);font-weight:800}
.note{font-size:.9rem;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin-top:30px}
.timeline{background:var(--cream);border-radius:10px;padding:14px 18px}
/* faq */
.faq details{border:1px solid var(--line);border-radius:12px;margin:0 0 10px;background:#fff}
.faq summary{padding:14px 44px 14px 18px;font-weight:600;cursor:pointer;color:var(--navy);list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:10px;font-size:1.4rem;color:var(--green)}
.faq details[open] summary::after{content:"–"}
.faq details>div{padding:0 18px 14px}
/* sidebar */
aside.side{position:relative}
.side .card{position:sticky;top:96px;border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff;box-shadow:0 10px 30px rgba(13,46,81,.07)}
.side .card h2{font-size:1.15rem;margin:0 0 8px}
.side .card p{font-size:.95rem;color:var(--muted)}
.side .card .btn{width:100%;margin-top:8px}
.side .mini{font-size:.88rem;margin:16px 0 0;padding:14px 0 0;border-top:1px solid var(--line);list-style:none}
.side .mini li{margin:4px 0}
/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card-link{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s,transform .15s}
.card-link:hover{border-color:var(--green);box-shadow:0 12px 30px rgba(13,46,81,.1);transform:translateY(-2px);color:var(--ink)}
.card-link h3{margin:0 0 6px;font-size:1.06rem}
.card-link p{margin:0;font-size:.92rem;color:var(--muted);line-height:1.55}
.card-link .more{display:inline-block;margin-top:10px;color:var(--green);font-weight:600;font-size:.9rem}
.cat-ico{width:46px;height:46px;border-radius:12px;background:#e8f4ee;color:var(--green);display:grid;place-items:center;margin-bottom:12px}
.cat-ico svg{width:24px;height:24px}
section.block{padding:64px 0}
section.alt{background:var(--soft)}
.center{text-align:center}
.sub{color:var(--muted);max-width:720px}
.center .sub{margin:0 auto 30px}
.why{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.why div{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.why h3{margin-top:0}
/* cta band */
.band{background:linear-gradient(120deg,var(--green-2),var(--green) 50%,#13a35a);color:#eafff2;border-radius:20px;padding:34px;display:flex;gap:24px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:40px 0}
.band h2{color:#fff;margin:0 0 6px;font-size:1.5rem}
.band p{margin:0}
.band.inline{margin:34px 0;padding:24px 26px}
.band.inline h2{font-size:1.2rem}
/* footer */
footer.site{background:#0a2440;color:#b9c6d3;padding:56px 0 90px;font-size:.93rem}
footer.site a{color:#dfe7ef;text-decoration:none}
footer.site a:hover{color:#7fe0a8}
footer .cols{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:30px}
footer h2{color:#fff;font-size:1rem;margin:0 0 12px}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin:6px 0}
footer .legal{border-top:1px solid #1d3a5a;margin-top:36px;padding-top:20px;font-size:.84rem;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.fbrand{display:flex;gap:10px;align-items:center;margin-bottom:12px}
.fbrand img{background:var(--cream);border-radius:50%;padding:4px}
.fbrand b{color:#fff;font-size:1.1rem}
/* floating */
.wa-float{position:fixed;right:18px;bottom:18px;z-index:60;width:60px;height:60px;border-radius:50%;background:var(--wa);display:grid;place-items:center;box-shadow:0 10px 26px rgba(0,0,0,.25);color:#fff}
.wa-float svg{width:32px;height:32px}
.mbar{display:none}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.form label{display:block;font-weight:600;font-size:.93rem;margin:12px 0 4px;color:var(--navy)}
.form input,.form select,.form textarea{width:100%;padding:12px 14px;border:1px solid #cdd5de;border-radius:10px;font:inherit;font-size:1rem}
.form textarea{min-height:110px}
.form button{margin-top:16px}
.info-list{list-style:none;padding:0}
.info-list li{padding:12px 0;border-bottom:1px solid var(--line)}
@media (max-width:980px){
 .layout{grid-template-columns:1fr}
 .side .card{position:static}
 nav.main{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;flex-direction:column;align-items:stretch;border-bottom:1px solid var(--line);padding:10px 20px 18px;max-height:80vh;overflow:auto}
 nav.main.open{display:flex}
 .mega{position:static;width:auto;grid-template-columns:1fr;box-shadow:none;border:0;padding:0 0 0 10px}
 .menu-toggle{display:inline-flex;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font:inherit;cursor:pointer}
 header.site .hdr-wa{display:none}
 .hero .grid{grid-template-columns:1fr}
 .hero .badge-logo{display:none}
 .why{grid-template-columns:1fr}
 footer .cols{grid-template-columns:1fr 1fr}
 .contact-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
 body{font-size:16px}
 .top .hide-s{display:none}
 .help{grid-template-columns:1fr}
 footer .cols{grid-template-columns:1fr}
 .wa-float{display:none}
 .mbar{display:grid;grid-template-columns:1fr 1.4fr;position:fixed;left:0;right:0;bottom:0;z-index:60;box-shadow:0 -6px 20px rgba(0,0,0,.12)}
 .mbar a{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px;font-weight:700;text-decoration:none;color:#fff}
 .mbar a:first-child{background:var(--navy)}
 .mbar a:last-child{background:var(--wa)}
 .mbar svg{width:20px;height:20px}
 .band{padding:24px}
 section.block{padding:44px 0}
}
@media print{header.site,.top,.wa-float,.mbar,aside.side,footer.site{display:none}}