:root{--sky:#38bdf8;--sky-2:#0ea5e9;--navy:#1e3a8a;--navy-2:#1e293b;--orange:#f97316;--yellow:#fbbf24;--pink:#ec4899;--green:#16a34a;--ink:#1e293b;--ink-soft:#64748b;--surface:#fff;--surface-2:#f0f9ff;--line:#e2e8f0;--grad-blue:linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);--grad-warm:linear-gradient(135deg, #fbbf24 0%, #f97316 100%);--grad-pink:linear-gradient(135deg, #f472b6 0%, #ec4899 100%);--radius:20px;--radius-lg:28px;--shadow:0 20px 50px -20px #1e3a8a59;--shadow-sm:0 10px 26px -14px #1e3a8a4d;--container:1180px;--font:"Baloo 2", "Noto Sans Bengali", system-ui, sans-serif;--font-body:"Inter", "Noto Sans Bengali", system-ui, sans-serif}*,:before,:after{box-sizing:border-box;margin:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-body);color:var(--ink);background:var(--surface);-webkit-font-smoothing:antialiased;line-height:1.65;overflow-x:hidden}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}ul{padding:0;list-style:none}button{font:inherit;cursor:pointer;background:0 0;border:0}:focus-visible{outline:3px solid var(--sky-2);outline-offset:3px;border-radius:6px}.container{width:min(100% - 2.4rem, var(--container));margin-inline:auto}h1,h2,h3,h4{font-family:var(--font);font-weight:700;line-height:1.15}h2{font-size:clamp(1.8rem,4vw,2.6rem)}h3{font-size:1.3rem}.grad-warm{background:var(--grad-warm);-webkit-text-fill-color:transparent;color:#0000;background-clip:text}.btn{font-family:var(--font);border-radius:999px;align-items:center;gap:.55rem;padding:.9rem 1.7rem;font-size:1rem;font-weight:700;transition:transform .2s,box-shadow .2s;display:inline-flex}.btn--primary{background:var(--grad-warm);color:#fff;box-shadow:0 14px 28px -12px #f973168c}.btn--primary:hover{transform:translateY(-2px)}.btn--ghost{color:var(--navy);border:2px solid var(--line);background:#fff}.btn--ghost:hover{border-color:var(--sky-2)}.btn--whatsapp{color:#fff;background:#25d366;box-shadow:0 14px 28px -12px #25d3668c}.btn--whatsapp:hover{transform:translateY(-2px)}.nav{z-index:50;backdrop-filter:blur(10px);border-bottom:1px solid var(--line);background:#ffffffeb;position:sticky;top:0}.nav__inner{justify-content:space-between;align-items:center;gap:1rem;padding:.8rem 0;display:flex}.brand{align-items:center;gap:.6rem;display:inline-flex}.brand__logo{width:auto;height:48px;display:block}.brand__text{flex-direction:column;line-height:1.1;display:flex}.brand__text strong{font-family:var(--font);color:var(--navy);font-size:1.05rem}.brand__text span{color:var(--ink-soft);font-size:.7rem;font-style:italic}.nav__links{align-items:center;gap:.4rem;display:flex}.hero{background:radial-gradient(120% 100% at 20% -10%,#e0f2fe 0%,#fff 55%);padding:4rem 0 5rem;position:relative;overflow:hidden}.hero__bg-blob{filter:blur();opacity:.5;z-index:0;border-radius:50%;position:absolute}.hero__inner{z-index:1;text-align:center;grid-template-columns:1fr;align-items:center;gap:2.5rem;display:grid;position:relative}.hero__badge{color:var(--pink);background:#fce7f3;border:1px solid #fbcfe8;border-radius:999px;align-items:center;gap:.5rem;margin-bottom:1.4rem;padding:.5rem 1.1rem;font-family:Noto Sans Bengali,sans-serif;font-size:.95rem;font-weight:600;display:inline-flex}.hero__bn{color:var(--yellow);-webkit-text-stroke:1px #92400e;text-shadow:2px 2px #0000001f;margin-bottom:.6rem;font-family:Noto Sans Bengali,sans-serif;font-size:clamp(1.6rem,4vw,2.4rem);font-weight:700;line-height:1.35}.hero__title{margin-bottom:.3rem;font-size:clamp(2.4rem,7vw,4.5rem)}.hero__title .brand-name{color:var(--navy)}.hero__title .product-name{background:var(--grad-blue);-webkit-text-fill-color:transparent;color:#0000;background-clip:text}.hero__age{font-family:var(--font);color:var(--ink-soft);background:var(--surface-2);border:1px solid var(--line);border-radius:999px;margin:1rem 0 1.6rem;padding:.4rem 1.1rem;font-size:1rem;font-weight:700;display:inline-block}.hero__subtitle{max-width:60ch;color:var(--ink-soft);margin:0 auto 2rem;font-family:Noto Sans Bengali,sans-serif;font-size:1.05rem}.hero__actions{flex-wrap:wrap;justify-content:center;gap:1rem;display:flex}.hero__books{z-index:1;flex-wrap:wrap;justify-content:center;gap:1.5rem;margin-top:3rem;display:flex;position:relative}.hero__book-card{border-radius:var(--radius);width:200px;box-shadow:var(--shadow);transform:rotate(var(--rot,0deg));background:var(--surface-2);transition:transform .3s;overflow:hidden}.hero__book-card:hover{transform:rotate(0)translateY(-8px)}.hero__book-card:first-child{--rot:-4deg}.hero__book-card:nth-child(2){--rot:4deg;margin-top:1.5rem}.hero__book-cover{aspect-ratio:3/4;object-fit:cover;width:100%}.hero__book-placeholder{aspect-ratio:3/4;color:#fff;width:100%;font-family:var(--font);text-align:center;place-items:center;gap:.5rem;padding:1rem;font-weight:700;display:grid}.books-grid{grid-template-columns:repeat(2,1fr);gap:2rem;display:grid}.book-card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--line);flex-direction:column;display:flex;overflow:hidden}.book-card__cover{aspect-ratio:4/5;object-fit:cover;background:var(--surface-2);width:100%}.book-card__cover-placeholder{aspect-ratio:4/5;color:#fff;width:100%;font-family:var(--font);place-items:center;font-size:1.4rem;font-weight:700;display:grid}.book-card__body{padding:1.6rem}.book-card__level{font-family:var(--font);color:#fff;border-radius:999px;margin-bottom:.8rem;padding:.3rem .9rem;font-size:.8rem;font-weight:700;display:inline-block}.book-card__for{color:var(--ink-soft);font-size:.95rem}.features-grid{grid-template-columns:repeat(4,1fr);gap:1.4rem;display:grid}.feature-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow-sm);padding:1.8rem 1.5rem}.feature-card__icon{background:var(--grad-blue);color:#fff;border-radius:1rem;place-items:center;width:3.4rem;height:3.4rem;margin:0 auto 1rem;display:grid}.feature-card h3{color:var(--navy);margin-bottom:.5rem;font-family:Noto Sans Bengali,sans-serif;font-size:1.1rem}.feature-card p{color:var(--ink-soft);font-family:Noto Sans Bengali,sans-serif;font-size:.92rem}.author{background:var(--surface-2);border-radius:var(--radius-lg);grid-template-columns:200px 1fr;align-items:center;gap:2.5rem;padding:2.5rem;display:grid}.author__photo{object-fit:cover;width:180px;height:180px;box-shadow:var(--shadow);border-radius:50%}.author__photo-placeholder{background:var(--grad-blue);color:#fff;width:180px;height:180px;font-family:var(--font);box-shadow:var(--shadow);border-radius:50%;place-items:center;font-size:3rem;font-weight:700;display:grid}.author h3{color:var(--navy)}.author__role{color:var(--orange);margin-bottom:.8rem;font-weight:600}.author__bio{color:var(--ink-soft);font-family:Noto Sans Bengali,sans-serif}.cta{background:var(--grad-blue);border-radius:var(--radius-lg);text-align:center;color:#fff;padding:3.5rem 2rem;position:relative;overflow:hidden}.cta h2{margin-bottom:.6rem;font-family:Noto Sans Bengali,sans-serif}.cta p{opacity:.9;margin-bottom:2rem;font-family:Noto Sans Bengali,sans-serif}.cta__actions{flex-wrap:wrap;justify-content:center;gap:1rem;display:flex}.cta .btn--ghost{color:#fff;background:#ffffff26;border-color:#fff6}.section{padding:5rem 0}.section--alt{background:var(--surface-2)}.section__head{text-align:center;max-width:640px;margin:0 auto 3rem}.section__kicker{font-family:var(--font);color:var(--sky-2);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.6rem;font-size:.85rem;font-weight:700;display:inline-block}.footer{background:var(--navy-2);color:#fff;padding:3rem 0 2rem}.footer__inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:2rem;display:flex}.footer__contact{flex-wrap:wrap;gap:1.5rem;display:flex}.footer__contact a{color:#cbd5e1;align-items:center;gap:.5rem;font-weight:600;display:inline-flex}.footer__contact a:hover{color:#fff}.footer__bottom{text-align:center;color:#94a3b8;border-top:1px solid #ffffff1a;margin-top:2rem;padding-top:1.5rem;font-size:.85rem}.reveal{opacity:0;transition:opacity .6s,transform .6s;transform:translateY(16px)}.reveal.in{opacity:1;transform:none}@media (width<=900px){.books-grid,.features-grid{grid-template-columns:repeat(2,1fr)}.author{text-align:center;grid-template-columns:1fr}.author__photo,.author__photo-placeholder{margin:0 auto}}@media (width<=620px){.features-grid{grid-template-columns:1fr}.footer__inner{text-align:center;flex-direction:column}}