:root{
  --blue:#0B3D91;--blue2:#082a66;--green:#16892F;--green2:#2DB34A;
  --ink:#0A1F44;--mut:#55627a;--paper:#FBF9F4;--card:#fff;--line:#e4e0d4;--mark:#d94a3d;--hl:#FFE98A;
  --serif:Georgia,"Iowan Old Style","Palatino Linotype",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Bengali","Hind Siliguri",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{width:min(1120px,92%);margin-inline:auto}
h1,h2,h3{font-family:var(--serif);line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5.6vw,4rem)}
h2{font-size:clamp(1.7rem,3.6vw,2.5rem)}
h3{font-size:1.3rem}
.eyebrow{font:700 .78rem/1 var(--sans);letter-spacing:.16em;text-transform:uppercase;color:var(--green)}
.hl{background:linear-gradient(transparent 58%,var(--hl) 58%);padding:0 .1em}
.lead{color:var(--mut);font-size:1.1rem;max-width:56ch}

/* header */
header.top{position:sticky;top:0;z-index:20;background:rgba(251,249,244,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0}
.bar img{height:44px;width:auto}
nav{display:flex;gap:4px;align-items:center}
nav a{text-decoration:none;padding:8px 12px;border-radius:8px;font-weight:600;font-size:.95rem}
nav a:hover,nav a.on{background:#eef2fa;color:var(--blue)}
.menu{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 12px;font:600 .9rem var(--sans);color:var(--ink)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid var(--blue);background:var(--blue);color:#fff;transition:.15s;cursor:pointer;font-size:1rem}
.btn:hover{background:var(--blue2);transform:translateY(-1px)}
.btn.g{background:var(--green);border-color:var(--green)}
.btn.g:hover{background:#0f6d24}
.btn.o{background:transparent;color:var(--blue)}
.btn.o:hover{background:#eef2fa}
.pending{opacity:.55}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* hero: ruled exercise-book page */
.hero{padding:56px 0 64px;background:
  linear-gradient(90deg,transparent 56px,rgba(217,74,61,.35) 56px,rgba(217,74,61,.35) 58px,transparent 58px),
  repeating-linear-gradient(transparent,transparent 31px,rgba(11,61,145,.09) 31px,rgba(11,61,145,.09) 32px);
  border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1{margin:14px 0 18px}
.hero h1 em{font-style:normal;color:var(--green)}
.paper{background:#fff;border:1px solid var(--line);border-radius:6px;padding:26px 26px 22px;box-shadow:0 18px 40px -18px rgba(10,31,68,.35),6px 6px 0 var(--blue);transform:rotate(1.6deg);position:relative}
.paper small{font:700 .7rem var(--sans);letter-spacing:.14em;color:var(--mut);text-transform:uppercase}
.paper h3{margin:6px 0 14px;font-size:1.45rem}
.paper dl{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;font-size:.95rem;border-top:2px solid var(--ink);padding-top:14px}
.paper dt{color:var(--mut)}
.paper dd{font-weight:700}
.stamp{position:absolute;right:-14px;top:-22px;width:84px;height:84px;border:3px solid var(--green);border-radius:50%;color:var(--green);display:grid;place-items:center;font:700 2rem var(--serif);transform:rotate(-12deg);background:#fff}
.stamp span{font:700 .55rem var(--sans);letter-spacing:.1em;display:block;text-align:center;margin-top:-6px}

/* sections */
section{padding:72px 0}
section.alt{background:#fff;border-block:1px solid var(--line)}
.head{max-width:680px;margin-bottom:38px}
.head h2{margin:10px 0 12px}
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.feat .n{font:700 .8rem var(--sans);color:#fff;background:var(--blue);width:34px;height:34px;border-radius:50%;display:grid;place-items:center;margin-bottom:14px}
.feat:nth-child(even) .n{background:var(--green)}
.feat h3{font-size:1.1rem;margin-bottom:6px;font-family:var(--sans);font-weight:700}
.feat p{color:var(--mut);font-size:.96rem}

/* subjects */
.subs{display:flex;flex-wrap:wrap;gap:12px}
.chip{padding:12px 20px;border:2px solid var(--ink);border-radius:10px;font-weight:700;background:#fff;box-shadow:3px 3px 0 var(--ink)}
.chip:nth-child(3n+2){border-color:var(--green);box-shadow:3px 3px 0 var(--green)}
.chip:nth-child(3n){border-color:var(--blue);box-shadow:3px 3px 0 var(--blue)}

/* course cards */
.course{padding:0;overflow:hidden;display:flex;flex-direction:column}
.course .ch{padding:22px 24px;color:#fff;background:var(--blue)}
.course.long .ch{background:var(--green)}
.course .ch small{font:700 .72rem var(--sans);letter-spacing:.14em;text-transform:uppercase;opacity:.85}
.course .ch h3{margin-top:6px;font-size:1.6rem}
.course .cb{padding:22px 24px;display:flex;flex-direction:column;gap:14px;flex:1}
ul.tick{list-style:none;display:grid;gap:9px}
ul.tick li{padding-left:28px;position:relative}
ul.tick li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.price{border:2px dashed var(--line);border-radius:10px;padding:12px 14px;font-size:.95rem;display:grid;gap:4px}
.price b{font-family:var(--serif);font-size:1.15rem}
table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
th{background:#f1f4fa;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--mut)}
tr:last-child td{border-bottom:0}
.note{font-size:.88rem;color:var(--mut);margin-top:12px}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{counter-increment:s;padding:24px;border-left:4px solid var(--green);background:#fff;border-radius:0 12px 12px 0;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.step:before{content:"0" counter(s);font:700 2rem var(--serif);color:var(--blue);display:block;margin-bottom:4px}

/* teachers */
.t{text-align:center}
.av{width:96px;height:96px;border-radius:50%;margin:0 auto 14px;display:grid;place-items:center;font:700 1.8rem var(--serif);color:#fff;background:var(--blue);border:4px solid #fff;box-shadow:0 0 0 2px var(--blue)}
.t:nth-child(even) .av{background:var(--green);box-shadow:0 0 0 2px var(--green)}
.t .sub{display:inline-block;margin:8px 0;padding:3px 12px;border-radius:99px;background:#eef2fa;color:var(--blue);font-weight:700;font-size:.82rem}
.t p{color:var(--mut);font-size:.93rem}

/* faq */
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px}
details+details{margin-top:10px}
summary{font-weight:700;cursor:pointer}
details p{margin-top:10px;color:var(--mut)}

/* cta band */
.band{background:var(--blue);color:#fff;padding:60px 0;text-align:center}
.band h2{margin-bottom:10px}
.band p{opacity:.85;margin-bottom:6px}
.band .cta-row{justify-content:center}
.band .btn.o{color:#fff;border-color:#fff}
.band .btn.o:hover{background:rgba(255,255,255,.12)}

/* contact list */
.cl{list-style:none;display:grid;gap:14px}
.cl li{display:flex;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--line);padding-bottom:12px}
.cl span{color:var(--mut)}
.cl a{font-weight:700;text-decoration:none;color:var(--blue)}

footer{background:var(--ink);color:#c9d2e6;padding:44px 0 28px;font-size:.92rem}
footer .fg{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
footer h4{color:#fff;margin-bottom:10px;font-family:var(--sans)}
footer a{display:block;text-decoration:none;padding:3px 0}
footer a:hover{color:#fff}
footer .logo{background:#fff;border-radius:10px;padding:8px 12px;display:inline-block;margin-bottom:12px}
footer .logo img{height:38px}
.disc{margin-top:28px;padding-top:18px;border-top:1px solid #243457;font-size:.8rem;opacity:.75}

.page-h{padding:52px 0 36px;border-bottom:1px solid var(--line);background:#fff}
.page-h h1{font-size:clamp(2rem,4.6vw,3.2rem);margin:10px 0}

@media(max-width:860px){
  .hero .wrap,.g3,.g2,.steps,footer .fg{grid-template-columns:1fr}
  .hero{padding:36px 0 48px}
  .paper{transform:none;margin-top:10px}
  .menu{display:block}
  nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--paper);flex-direction:column;align-items:stretch;padding:10px 4%;border-bottom:1px solid var(--line)}
  nav.open{display:flex}
  section{padding:52px 0}
}
.bar img,footer .logo img{mix-blend-mode:multiply}
footer .logo img{mix-blend-mode:normal}
.hero{overflow:hidden}
@media(max-width:860px){.hero{background:repeating-linear-gradient(transparent,transparent 31px,rgba(11,61,145,.09) 31px,rgba(11,61,145,.09) 32px)}.stamp{right:-6px}}

/* ---- additions shared by all designs ---- */
.announce{background:var(--green);color:#fff;text-align:center;padding:8px 4%;font-weight:600;font-size:.92rem}
.announce[hidden]{display:none}
.av img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.av{overflow:hidden}
.deco,.strip{display:none}
.bar img{mix-blend-mode:multiply}
footer .logo img{mix-blend-mode:normal}
.hero{overflow:hidden}
.pending{opacity:.55}
@media(max-width:860px){.hero{background:repeating-linear-gradient(transparent,transparent 31px,rgba(11,61,145,.09) 31px,rgba(11,61,145,.09) 32px)}.stamp{right:-6px}}