:root{
  --ink:#2a1a1f; --muted:#6f5f65; --magenta:#a0155e; --maroon:#6b2430; --green:#6f9a5c; --mist:#f4f7f5; --paper:#fffdfb;
  --line:rgba(107,36,48,.14); --glass:rgba(255,255,255,.72); --radius:20px;
  --shadow:0 18px 50px -20px rgba(107,36,48,.35);
  --sans:'Plus Jakarta Sans',system-ui,sans-serif; --serif:'Fraunces',Georgia,serif; --as:'Noto Serif Bengali','Noto Sans Bengali',serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font-family:var(--sans);color:var(--ink);line-height:1.65;background:
  radial-gradient(1200px 600px at 85% -10%,#fde3ef 0,transparent 60%),
  radial-gradient(900px 500px at -10% 30%,#e3f1e6 0,transparent 55%),var(--mist);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--magenta);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{font-family:var(--serif);line-height:1.15;margin:.2em 0 .4em;color:var(--maroon)}
h1{font-size:clamp(2rem,4vw,3rem)}h2{font-size:clamp(1.7rem,3vw,2.4rem)}h3{font-size:1.2rem}
.as{font-family:var(--as);line-height:1.9}
.muted{color:var(--muted)}.center{text-align:center}.right{text-align:right}.grow{flex:1}
.hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}

/* nav */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px clamp(16px,4vw,48px);background:rgba(244,247,245,.7);backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:.3s}
.nav.scrolled{border-color:var(--line);background:rgba(255,253,251,.9)}
.brand{display:flex;flex-direction:column;line-height:1.1;color:var(--maroon)}.brand:hover{text-decoration:none}
.brand-as{font-family:var(--as);font-weight:700;font-size:1.35rem;color:var(--maroon)}.brand small{font-size:.65rem;letter-spacing:.25em;text-transform:uppercase;color:var(--muted)}
.nav nav{display:flex;align-items:center;gap:22px}.nav nav a{color:var(--ink);font-weight:500;font-size:.93rem}.nav nav a:hover{color:var(--magenta);text-decoration:none}
.cart-link b{display:inline-grid;place-items:center;min-width:22px;height:22px;border-radius:99px;background:var(--magenta);color:#fff;font-size:.75rem;margin-left:4px}
.burger{display:none;background:none;border:0;padding:8px;cursor:pointer}.burger i{display:block;width:24px;height:2px;background:var(--maroon);margin:5px 0;transition:.3s}

/* buttons / forms */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:99px;border:2px solid var(--magenta);background:linear-gradient(135deg,var(--magenta),#c2306f);color:#fff;font:600 .95rem var(--sans);cursor:pointer;box-shadow:0 10px 26px -10px rgba(160,21,94,.6);transition:.25s}
.btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px -12px rgba(160,21,94,.7);text-decoration:none}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-ghost{background:transparent;color:var(--magenta);box-shadow:none}
.btn-sm{padding:8px 16px;font-size:.85rem}.wide{width:100%;margin-top:10px}
.link{background:none;border:0;color:var(--magenta);cursor:pointer;text-decoration:underline;font:inherit}
.form label{display:block;font-size:.85rem;font-weight:600;margin:10px 0}
input,select,textarea{width:100%;margin-top:5px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;font:inherit;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid rgba(160,21,94,.35);border-color:var(--magenta)}
.row{display:flex;gap:10px;align-items:center}.row input{margin:0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}.grid3{display:grid;grid-template-columns:1.2fr 1.5fr 1fr;gap:14px}
label.radio{display:flex;gap:10px;align-items:flex-start;font-weight:500;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff}
label.radio input{width:auto;margin:5px 0 0}

/* flash */
.flash-wrap{max-width:900px;margin:14px auto 0;padding:0 16px}
.flash{padding:12px 16px;border-radius:12px;margin:8px 0;font-weight:500;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.flash-ok{background:#e4f4e4;color:#1f5a26}.flash-bad{background:#fde8ea;color:#8a1c2b}.flash-warn{background:#fff3d9;color:#7a5200}

/* hero */
.hero{position:relative;display:grid;grid-template-columns:1.05fr 1fr;gap:20px;align-items:center;min-height:calc(100vh - 64px);padding:40px clamp(16px,5vw,72px) 60px;overflow:hidden}
.mist{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;z-index:0;animation:drift 14s ease-in-out infinite alternate}
.m1{width:420px;height:420px;background:#f7c5dc;right:6%;top:6%}.m2{width:380px;height:380px;background:#cfe6cc;left:-6%;bottom:-8%;animation-delay:-6s}
@keyframes drift{to{transform:translate(40px,-30px) scale(1.1)}}
.hero-copy,.hero-book{position:relative;z-index:1}
.eyebrow{display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--green);margin-bottom:6px}
.hero h1{margin:.1em 0}
.as-title{display:block;font-family:var(--as);font-weight:700;font-size:clamp(3rem,8vw,6rem);line-height:1.1;background:linear-gradient(120deg,var(--magenta),var(--maroon));-webkit-background-clip:text;background-clip:text;color:transparent}
.en-title{display:block;font-family:var(--serif);font-size:clamp(1.2rem,2.4vw,1.8rem);letter-spacing:.35em;text-transform:uppercase;color:var(--maroon);margin-top:2px}
.lead{font-size:1.15rem;max-width:34em;color:#4b3a41}.by{color:var(--muted)}
.cta{display:flex;gap:14px;flex-wrap:wrap;margin:22px 0}
.ticks{list-style:none;padding:0;margin:0;display:flex;gap:18px;flex-wrap:wrap;font-size:.85rem;color:var(--muted)}.ticks li:before{content:'✓ ';color:var(--green);font-weight:700}
.book-stage{position:relative;height:min(62vh,560px);min-height:380px}
.book-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:none;cursor:grab}.book-stage canvas:active{cursor:grabbing}
.book-stage.webgl canvas{display:block}.book-stage.webgl .book-fallback{display:none}
.book-fallback{height:100%;margin:auto;border-radius:6px;box-shadow:var(--shadow);transform:rotate(-4deg)}
.book-ctrl{display:flex;gap:8px;justify-content:center;align-items:center;margin-top:6px;flex-wrap:wrap}
.book-ctrl button{border:1px solid var(--line);background:var(--glass);padding:7px 16px;border-radius:99px;font:600 .8rem var(--sans);color:var(--maroon);cursor:pointer;transition:.2s}
.book-ctrl button.on,.book-ctrl button:hover{background:var(--maroon);color:#fff}.book-ctrl span{font-size:.75rem;color:var(--muted);margin-left:8px}

/* strip */
.strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;max-width:1100px;margin:-20px auto 0;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);position:relative;z-index:2}
.strip div{background:var(--paper);padding:20px;text-align:center}.strip b{display:block;font-family:var(--serif);font-size:1.15rem;color:var(--maroon)}.strip span{font-size:.8rem;color:var(--muted)}

/* sections */
.sec{padding:90px clamp(16px,5vw,72px)}.sec.alt{background:linear-gradient(180deg,rgba(255,255,255,.65),rgba(255,255,255,.3))}
.sec-head{max-width:720px;margin:0 auto 40px;text-align:center}.sec-head p{color:var(--muted)}
.card{background:var(--glass);backdrop-filter:blur(8px);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 8px 30px -22px rgba(107,36,48,.5)}
.card.inner{background:#fff;margin:14px 0}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:1100px;margin:0 auto}
.tilt{transition:transform .25s ease,box-shadow .25s}.tilt:hover{box-shadow:var(--shadow)}
.ico{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#fbd5e6,#e1f0dc);color:var(--maroon);font:700 1rem var(--serif);margin-bottom:12px}
.chips{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:28px}
.chip{display:inline-block;padding:4px 12px;border-radius:99px;background:#fbe6ef;color:var(--magenta);font-size:.75rem;font-weight:700}a.chip.on{background:var(--magenta);color:#fff}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px;max-width:1100px;margin:0 auto 30px}
.lesson{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}
.lesson:before{content:'“';position:absolute;right:18px;top:0;font:700 4rem var(--serif);color:rgba(160,21,94,.12)}
.lesson h3{font-size:1.15rem}.lesson p{color:#4b3a41;margin:0}

/* author */
.author{display:grid;grid-template-columns:340px 1fr;gap:48px;align-items:center;max-width:1050px;margin:0 auto}
.author-photo{margin:0;border-radius:28px;overflow:hidden;box-shadow:var(--shadow);transform:rotate(-2deg);border:6px solid #fff}
.note{margin:18px 0 0;padding:20px 24px;border-left:4px solid var(--magenta);background:rgba(255,255,255,.7);border-radius:0 16px 16px 0;font-size:1.02rem}

/* buy */
.buy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,420px));gap:28px;justify-content:center}
.prod{display:flex;gap:20px;padding:20px;position:relative;align-items:center}
.prod img{width:120px;border-radius:6px;box-shadow:0 14px 28px -12px rgba(0,0,0,.4);flex:none;transform:rotate(-3deg)}
.prod-body p{font-size:.9rem;color:var(--muted);margin:.2em 0 .6em}
.price b{font:700 1.7rem var(--serif);color:var(--maroon)}.price s{margin-left:10px;color:var(--muted)}
.ribbon{position:absolute;top:14px;right:-6px;background:var(--green);color:#fff;font-size:.72rem;font-weight:700;padding:4px 12px;border-radius:6px 0 0 6px}
.trust{display:flex;gap:26px;justify-content:center;flex-wrap:wrap;margin-top:34px;font-size:.88rem;color:var(--muted)}
.stars{color:#e0a100;letter-spacing:2px}
.review-form{max-width:640px;margin:34px auto 0}.review-form summary{cursor:pointer;color:var(--magenta);font-weight:600;text-align:center}
.faq{max-width:760px;margin:0 auto}.faq details{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:600}details[open] summary{color:var(--magenta)}.faq p{margin:.6em 0 0;color:var(--muted)}
.contact{display:grid;grid-template-columns:1fr 1.2fr;gap:44px;max-width:1050px;margin:0 auto;align-items:start}
.clist{list-style:none;padding:0}.clist li{margin:10px 0}

/* inner pages */
.page{max-width:1100px;margin:0 auto;padding:46px clamp(16px,4vw,40px) 80px}.page.narrow{max-width:760px}
.checkout{display:grid;grid-template-columns:1.5fr 1fr;gap:26px;align-items:start}.sticky{position:sticky;top:90px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
.cart-row{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.cart-row img{width:54px;border-radius:4px}.cart-row .qty{width:64px;margin:0;text-align:center}.amt{min-width:70px;text-align:right}.x{background:none;border:0;color:var(--muted);cursor:pointer;font-size:1rem}
.sum{display:flex;justify-content:space-between;gap:14px;padding:6px 0}.sum.total{border-top:1px solid var(--line);margin-top:8px;padding-top:12px;font-size:1.15rem;color:var(--maroon)}
.between{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.badge{display:inline-block;padding:3px 11px;border-radius:99px;font-size:.75rem;font-weight:700}
.badge-ok{background:#e4f4e4;color:#1f5a26}.badge-warn{background:#fff3d9;color:#7a5200}.badge-bad{background:#fde8ea;color:#8a1c2b}.badge-info{background:#e5eefc;color:#1d4a91}
.steps{list-style:none;display:flex;justify-content:space-between;padding:0;margin:24px 0;position:relative}
.steps:before{content:'';position:absolute;left:8%;right:8%;top:11px;height:3px;background:var(--line)}
.steps li{position:relative;text-align:center;font-size:.8rem;flex:1;color:var(--muted)}.steps li span{display:block;width:24px;height:24px;border-radius:50%;background:#fff;border:3px solid var(--line);margin:0 auto 6px;position:relative}
.steps li.done{color:var(--maroon);font-weight:600}.steps li.done span{background:var(--magenta);border-color:var(--magenta)}
.prose{line-height:1.85}

/* footer */
.foot{background:#2a1a1f;color:#e9dfe3;padding:56px clamp(16px,5vw,72px) 24px}.foot a{color:#f3c2da;display:block;margin:6px 0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px;max-width:1100px;margin:0 auto}.foot h4{margin:0 0 10px;font-family:var(--serif);color:#fff}
.foot .brand-as.big{font-size:2rem;color:#fff}.social{display:flex;gap:14px;flex-wrap:wrap}.social a{display:inline}
.sub{display:flex;gap:8px}.sub input{margin:0;background:#3a272d;border-color:#5a4249;color:#fff}.foot small{color:#b9a8ae}
.foot-bottom{max-width:1100px;margin:34px auto 0;padding-top:18px;border-top:1px solid #4a363c;font-size:.8rem;color:#b9a8ae;text-align:center}

/* reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s ease,transform .8s ease}.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.mist{animation:none}}

@media(max-width:900px){
  .hero{grid-template-columns:1fr;min-height:0;padding-top:20px;text-align:center}.cta,.ticks{justify-content:center}.lead{margin:auto}
  .book-stage{height:420px}.strip{grid-template-columns:1fr 1fr;margin-top:10px}
  .cards3,.contact,.checkout,.two{grid-template-columns:1fr}.author{grid-template-columns:1fr;text-align:center}.author-photo{max-width:280px;margin:auto}
  .note{text-align:left}.foot-grid{grid-template-columns:1fr 1fr}.sticky{position:static}
  .burger{display:block}.nav nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:flex-start;gap:0;background:var(--paper);padding:8px 20px 16px;border-bottom:1px solid var(--line);display:none}
  .nav.open nav{display:flex}.nav nav a{padding:10px 0;width:100%}
  .sec{padding:60px 16px}.grid3,.grid2{grid-template-columns:1fr}.prod{flex-direction:column;text-align:center}
}

/* author photo (square portrait) */
.author-photo img{display:block;width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;object-position:center top}

/* checkout: single online-payment note */
.pay-note{padding:14px 16px;border:1px solid var(--magenta);border-radius:12px;background:#fff7fb;color:var(--maroon)}

/* three editions */
.buy-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr));max-width:1180px;margin-left:auto;margin-right:auto}
.prod-best{border:2px solid var(--magenta)}

/* review photos + upload preview */
.rv-photos{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.rv-photo img{width:84px;height:84px;object-fit:cover;border-radius:10px;border:1px solid var(--line);display:block}
.rv-preview{display:flex;gap:8px;flex-wrap:wrap;margin:6px 0 10px}
.rv-preview img{width:72px;height:72px;object-fit:cover;border-radius:10px;border:1px solid var(--line)}
.lightbox{position:fixed;inset:0;background:rgba(20,8,14,.88);display:flex;align-items:center;justify-content:center;z-index:999;padding:20px;cursor:zoom-out}
.lightbox img{max-width:100%;max-height:100%;border-radius:12px}

/* edition cards: stacked layout so three fit side by side */
.prod{flex-direction:column;text-align:center;padding:28px 20px 24px}
.prod img{width:140px}
.prod .row{justify-content:center;flex-wrap:nowrap}
.prod .btn{white-space:nowrap;padding-left:20px;padding-right:20px}
.prod-body{display:flex;flex-direction:column;align-items:center;flex:1}
.prod-body p{flex:1}