:root{--bg:#f5efe6;--card:#fff;--tx:#14213d;--mut:#5b6478;--cta:#e76f23;--ok:#1f9d55;--line:#e3dccf;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root{--bg:#0f1524;--card:#18203a;--tx:#f1ede4;--mut:#a9b1c4;--line:#2a3350;color-scheme:dark}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--tx);font-family:"Hind Siliguri","Noto Sans Bengali",system-ui,sans-serif;font-size:16px;line-height:1.6;padding-bottom:84px}
.w{max-width:1100px;margin:0 auto;padding:0 16px}
.bar{background:var(--tx);color:var(--bg);text-align:center;font-size:14px;padding:6px 10px}
header{position:sticky;top:env(safe-area-inset-top,0px);background:var(--card);border-bottom:1px solid var(--line);z-index:5}
header .w{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font-weight:700;font-size:22px}.logo b{color:var(--cta)}
.btn{display:inline-block;background:var(--cta);color:#fff;border:0;border-radius:10px;padding:12px 20px;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;text-align:center}
.btn.sm{padding:8px 14px}.btn.ok{background:var(--ok)}.btn:disabled{opacity:.6;cursor:wait}
.hero{display:grid;gap:20px;padding:20px 0}
.gal{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px}.gal img{width:100%;height:auto;display:block;border-radius:10px}
h1{font-size:26px;line-height:1.3;margin:0 0 8px}h2{font-size:22px;margin:0 0 12px}
.price{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:10px 0}.price b{font-size:32px;color:var(--cta)}.price s{color:var(--mut)}
.badge{background:var(--ok);color:#fff;border-radius:99px;padding:2px 10px;font-size:14px}
.trust{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:8px 0 24px}
.trust div,.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
.trust div{text-align:center;font-weight:600;font-size:15px}
section{padding:14px 0}
.grid4{display:grid;gap:12px;grid-template-columns:1fr}
.card h3{margin:0 0 4px;font-size:18px}.card p{margin:0;color:var(--mut)}
.scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse;background:var(--card);border-radius:12px;overflow:hidden;min-width:420px}
th,td{padding:10px;border-bottom:1px solid var(--line);text-align:center}th{background:var(--line)}
.checkout{display:grid;gap:16px}
label{display:block;font-weight:600;margin:12px 0 4px}
input,textarea{width:100%;font:inherit;font-size:16px;padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--tx)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opts button{font:inherit;font-weight:600;min-width:52px;min-height:44px;padding:8px 14px;border-radius:10px;border:2px solid var(--line);background:var(--bg);color:var(--tx);cursor:pointer}
.opts button.on{border-color:var(--cta);background:var(--cta);color:#fff}
.radio{display:flex;align-items:center;gap:10px;padding:12px;border:1px solid var(--line);border-radius:10px;margin-top:8px;font-weight:400;cursor:pointer}
.radio input{width:20px;height:20px}
.qty{display:flex;align-items:center;gap:12px}.qty button{width:44px;height:44px;font-size:22px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--tx);cursor:pointer}
.sum div{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--line)}.sum .t{font-weight:700;font-size:20px;border:0}
.okt{color:var(--ok)!important;font-weight:600;margin:8px 0!important}
.err{color:#d33;font-size:14px;min-height:20px}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:8px}summary{font-weight:600;cursor:pointer}
footer{background:var(--tx);color:var(--bg);padding:24px 0;margin-top:20px;font-size:14px}footer a{color:inherit;margin-right:12px}
.sticky{position:fixed;left:0;right:0;bottom:0;background:var(--card);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));display:flex;gap:8px;z-index:6;transition:transform .2s}
.sticky.off{transform:translateY(110%)}.sticky .btn{flex:1}
#thanks{text-align:center}#thanks[hidden]{display:none}
.doc{max-width:760px;margin:0 auto;padding:24px 16px}
@media(min-width:640px){.trust{grid-template-columns:repeat(4,1fr)}.grid4{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.hero{grid-template-columns:1fr 1fr;align-items:start}.grid4{grid-template-columns:repeat(4,1fr)}.checkout{grid-template-columns:1.2fr 1fr;align-items:start}h1{font-size:34px}.sticky{display:none}body{padding-bottom:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.sticky{transition:none}}