/* EduTimeBD — থিম A: সবুজ ও সাদা (পরিষ্কার, শান্ত, অনেক ফাঁকা জায়গা)
   শিরোনাম: Anek Bangla • লেখা: Hind Siliguri */
:root {
  --brand: #0F766E;
  --brand-dark: #0B5E58;
  --brand-ink: #0B2E2B;
  --brand-50: #F0F7F5;
  --brand-100: #DDEFEA;
  --brand-200: #BFE0D8;
  --amber: #B7791F;
  --amber-ink: #7A4A00;
  --amber-50: #FDF6E7;
  --ink: #1F2937;
  --muted: #5B6472;
  --line: #E7EEEC;
  --bg: #FFFFFF;
  --card: #FFFFFF;
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgba(11,46,43,.05), 0 2px 8px rgba(11,46,43,.04);
  --shadow-md: 0 2px 4px rgba(11,46,43,.04), 0 12px 32px -8px rgba(11,46,43,.14);
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }
/* hidden দেওয়া জিনিস সবসময় লুকানো থাকবে, display দেওয়া ক্লাস থাকলেও */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Hind Siliguri", "Noto Sans Bengali", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, .brand span, .price {
  font-family: "Anek Bangla", "Hind Siliguri", sans-serif;
  color: var(--brand-ink);
  letter-spacing: -.01em;
}
h1, h2 { font-weight: 700; }
h3 { font-weight: 600; }
img { max-width: 100%; display: block; }
a { color: var(--brand); }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.muted { color: var(--muted); }
::selection { background: var(--brand-100); }

/* ───── হেডার ───── */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s;
}
.nav.scrolled { box-shadow: 0 6px 24px -12px rgba(11,46,43,.18); }
.nav .wrap { display: flex; align-items: center; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 21px; }
.brand span { color: var(--brand-ink); }
.brand b { color: var(--brand); font-weight: 700; }
.brand img { width: 36px; height: 36px; border-radius: 10px; }
.nav-links { margin-left: auto; display: flex; gap: 4px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 15.5px; font-weight: 500; padding: 6px 12px; border-radius: 999px; transition: color .2s, background .2s; }
.nav-links a:hover { color: var(--brand-ink); background: var(--brand-50); }
.nav-links a.active { color: var(--brand); background: var(--brand-50); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; margin-left: 8px; background: #fff; border: 1px solid var(--line); color: var(--brand-ink); font-size: 20px; width: 40px; height: 40px; border-radius: 10px; cursor: pointer; }

/* ───── বোতাম ───── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px;
  font-weight: 600; text-decoration: none; font-size: 16px; font-family: inherit;
  border: 1.5px solid transparent;
  transition: transform .2s var(--ease), box-shadow .2s, background .2s, color .2s, border-color .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-gold { background: var(--brand); color: #fff; box-shadow: 0 6px 18px -6px rgba(15,118,110,.55); }
.btn-gold:hover { background: var(--brand-dark); box-shadow: 0 10px 24px -8px rgba(15,118,110,.6); }
.btn-ghost { border-color: var(--brand-200); color: var(--brand); background: #fff; }
.btn-ghost:hover { border-color: var(--brand); background: var(--brand-50); }
.btn-ghost-dark { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost-dark:hover { border-color: var(--brand-200); color: var(--brand); }
.btn-white { background: #fff; color: var(--brand); }
.btn-white:hover { background: var(--brand-50); }
.btn-sm { padding: 8px 18px; font-size: 14.5px; }
.btn:disabled { opacity: .6; cursor: wait; transform: none; }

/* ───── হিরো ───── */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, var(--brand-50) 0%, #fff 100%);
  padding: 80px 0 96px;
}
.hero::before {
  content: ""; position: absolute; width: 520px; height: 520px; right: -140px; top: -160px; border-radius: 50%;
  background: radial-gradient(circle, rgba(15,118,110,.10), transparent 70%);
  pointer-events: none;
}
.hero .wrap { position: relative; display: grid; grid-template-columns: 1.2fr .8fr; gap: 56px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px;
  background: #fff; color: var(--brand); font-weight: 600; font-size: 14px;
  border: 1px solid var(--brand-100); box-shadow: var(--shadow-sm);
}
.pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--brand); }
.hero h1 { font-size: clamp(38px, 5.6vw, 62px); line-height: 1.15; margin: 20px 0 16px; }
.hero h1 span, .page-hero h1 span { color: var(--brand); }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 560px; margin: 0 0 30px; }
.hero .cta, .page-hero .cta { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-card {
  justify-self: center; width: min(330px, 100%);
  background: #fff; border: 1px solid var(--line);
  border-radius: 28px; padding: 32px 28px; text-align: center;
  box-shadow: var(--shadow-md);
  animation: float 7s ease-in-out infinite;
}
.hero-card img { width: 128px; height: 128px; border-radius: 30px; margin: 0 auto 18px; box-shadow: 0 12px 30px -10px rgba(15,118,110,.4); }
.hero-card h3 { margin: 0; font-size: 26px; }
.hero-card h3 b { color: var(--brand); }
.hero-card p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }
.trio { margin-top: 18px; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.trio span { font-size: 13.5px; padding: 4px 12px; border-radius: 999px; background: var(--brand-50); color: var(--brand-ink); }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ভেতরের পেজের হিরো */
.page-hero {
  background: linear-gradient(180deg, var(--brand-50) 0%, #fff 100%);
  padding: 56px 0 56px; border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(32px, 4.6vw, 50px); line-height: 1.2; margin: 12px 0 10px; }
.page-hero p { color: var(--muted); max-width: 640px; margin: 0; font-size: 18px; }
.page-hero .cta { margin-top: 26px; }
.crumbs { font-size: 14px; color: var(--muted); }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--brand); }

/* ───── সেকশন ───── */
section { padding: 88px 0; }
.sec-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.sec-head h2 { font-size: clamp(30px, 3.8vw, 42px); line-height: 1.25; margin: 12px 0 10px; }
.sec-head p { color: var(--muted); margin: 0; }
.kicker {
  display: inline-block; padding: 4px 14px; border-radius: 999px;
  background: var(--brand-50); color: var(--brand); font-weight: 600; font-size: 14px;
}

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* কার্ড */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--brand-100); }
.card h3 { margin: 16px 0 6px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }
.card ul { margin: 12px 0 0; padding-left: 18px; color: var(--muted); font-size: 15.5px; }
.card li { margin: 4px 0; }
a.card { text-decoration: none; display: block; color: inherit; }
.card .more { display: inline-flex; gap: 6px; margin-top: 16px; color: var(--brand); font-weight: 600; font-size: 15px; text-decoration: none; transition: gap .2s; }
.card:hover .more { gap: 10px; }

.ico {
  width: 52px; height: 52px; border-radius: 14px;
  display: grid; place-items: center; font-size: 25px;
  background: var(--brand-50);
  transition: transform .3s var(--ease);
}
.card:hover .ico { transform: scale(1.08); }
.ico.gold { background: var(--amber-50); }
.ico.teal { background: var(--brand-50); }
.ico.sky { background: #EEF4FB; }
.ico.violet { background: #F3F0FB; }
.ico.coral { background: #FCEFEC; }

.tag { display: inline-block; font-size: 13px; font-weight: 600; padding: 3px 12px; border-radius: 999px; background: var(--brand-50); color: var(--brand); }
.tag.gold { background: var(--amber-50); color: var(--amber-ink); }
.tag.muted { background: #F1F3F2; color: var(--muted); }

/* তিনজনের অংশ (EduTimeBD অ্যাপ পেজ) */
.audience .card { border-top: 4px solid var(--brand); }
.audience .card:nth-child(2) { border-top-color: var(--amber); }
.audience .card:nth-child(3) { border-top-color: #3B7DC4; }

/* হালকা সবুজ ব্যান্ড */
.band { background: var(--brand-50); }
.band .card { border-color: transparent; }
.band .kicker { background: #fff; }

/* দুই কলাম (কোচিং ইত্যাদি) */
.coaching { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.coaching h2 { font-size: clamp(30px, 3.8vw, 42px); line-height: 1.25; margin: 12px 0 14px; }
.coaching .box { background: var(--brand); color: #fff; border-radius: 24px; padding: 40px; box-shadow: var(--shadow-md); }
.coaching .box h3 { font-size: 28px; margin: 0 0 8px; color: #fff; }
.coaching .box p { margin: 0 0 22px; color: var(--brand-100); }
.coaching .box .btn { background: #fff; color: var(--brand); }
.coaching .box .btn:hover { background: var(--brand-50); }
.checks { list-style: none; padding: 0; margin: 0; color: var(--ink); }
.checks li { padding-left: 34px; position: relative; margin: 12px 0; }
.checks li::before {
  content: "✓"; position: absolute; left: 0; top: 3px; width: 22px; height: 22px; border-radius: 50%;
  background: var(--brand-100); color: var(--brand); font-weight: 700; display: grid; place-items: center; font-size: 12px;
}

/* হাইলাইট কার্ড (হোম) */
.cta-card h3 { font-size: 26px; margin-top: 0; }
.cta-card .btn { margin-top: 20px; }
.cta-green { background: var(--brand); border-color: var(--brand); }
.cta-green h3 { color: #fff; }
.cta-green p { color: var(--brand-100); }
.cta-amber { background: var(--amber-50); border-color: #F5E3BC; }
.cta-amber h3 { color: var(--amber-ink); }
.cta-amber p { color: #8A6A2A; }

/* ডাউনলোড/কল-টু-অ্যাকশন বাক্স */
.download { text-align: center; }
.download .inner {
  background: var(--brand-ink); color: #fff; border-radius: 28px; padding: 64px 24px;
  position: relative; overflow: hidden;
}
.download .inner::before {
  content: ""; position: absolute; width: 420px; height: 420px; left: -120px; bottom: -220px; border-radius: 50%;
  background: radial-gradient(circle, rgba(94,234,212,.18), transparent 70%);
}
.download h2 { font-size: clamp(28px, 3.8vw, 42px); margin: 0 0 10px; color: #fff; position: relative; }
.download p { color: #A9C9C3; margin: 0 0 28px; position: relative; }
.download .btn { position: relative; }
.download .btn-gold { background: #fff; color: var(--brand-ink); box-shadow: none; }
.download .btn-gold:hover { background: var(--brand-50); }

/* যোগাযোগ */
.contact .card { text-align: center; }
.contact a.big { font-size: 20px; font-weight: 600; text-decoration: none; color: var(--brand-ink); }
.contact a.big:hover { color: var(--brand); }

/* ───── ফুটার ───── */
footer { background: var(--brand-ink); color: #A9C9C3; padding: 56px 0 28px; font-size: 15px; }
footer a { color: #A9C9C3; text-decoration: none; }
footer a:hover { color: #fff; }
footer .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; align-items: start; }
.footer-grid h4 { color: #fff; margin: 4px 0 12px; font-size: 16px; }
.footer-grid a { display: block; margin: 0 0 8px; }
.footer-grid .brand { display: flex; margin-bottom: 10px; }
.footer-grid .brand span { color: #fff; }
.footer-grid .brand b { color: #5EEAD4; }
.footer-grid p { margin: 6px 0; }
.footer-grid p a { display: inline; }
footer .footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding-top: 20px; text-align: center; }
.footer-bottom a { margin: 0 4px; }

/* ───── লেখার পেজ (নীতিমালা) ───── */
.doc { max-width: 780px; margin: 0 auto; padding: 56px 16px 88px; }
.doc h1 { font-size: 36px; line-height: 1.3; margin: 0 0 6px; }
.doc h2 { font-size: 23px; margin: 34px 0 8px; }
.doc .meta { color: var(--muted); margin: 0 0 24px; }
.doc .note { background: var(--brand-50); border-left: 4px solid var(--brand); padding: 14px 18px; border-radius: 0; }

/* ───── অ্যাপ কার্ড ───── */
.app-card { display: flex; gap: 18px; align-items: flex-start; }
.app-card img { width: 72px; height: 72px; border-radius: 18px; flex: none; box-shadow: var(--shadow-sm); }
.app-card h3 { margin: 0 0 4px; }
.app-card .soon { width: 72px; height: 72px; border-radius: 18px; flex: none; display: grid; place-items: center; font-size: 30px; background: var(--brand-50); }

/* ───── বই ───── */
.book-card { display: grid; grid-template-columns: 120px 1fr; gap: 20px; align-items: center; }
.book-card .cover { border-radius: 8px; box-shadow: 0 12px 28px -10px rgba(11,46,43,.35); transition: transform .3s var(--ease); }
.book-card:hover .cover { transform: rotate(-2deg) scale(1.03); }
.price { font-size: 28px; font-weight: 700; }
.price s { font-size: 17px; color: var(--muted); font-weight: 500; margin-left: 6px; }
.price .off { font-size: 13px; vertical-align: middle; margin-left: 6px; }
.cover-showcase { width: min(280px, 80%); margin: 0 auto; border-radius: 10px; box-shadow: 0 30px 60px -20px rgba(11,46,43,.45); transform: rotate(-3deg); }

.book-hero .wrap { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: center; }
.book-hero .cover { width: min(300px, 100%); margin: 0 auto; border-radius: 10px; box-shadow: 0 30px 60px -20px rgba(11,46,43,.45); animation: book-float 7s ease-in-out infinite; }
@keyframes book-float { 0%, 100% { transform: rotate(-3deg) translateY(0); } 50% { transform: rotate(-1deg) translateY(-10px); } }
.book-hero .price { font-size: 36px; }
.trust { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 20px; font-size: 14.5px; color: var(--muted); }
.samples { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.samples figure { margin: 0; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 12px; box-shadow: var(--shadow-sm); }
.samples figcaption { font-size: 14px; color: var(--muted); text-align: center; margin-top: 8px; }
.toc { columns: 2; column-gap: 32px; padding-left: 20px; color: var(--muted); }
.toc li { margin: 6px 0; break-inside: avoid; }
.quote { font-size: 15.5px; color: var(--muted); }
.quote b { display: block; color: var(--brand-ink); margin-top: 10px; font-size: 15px; }
.stars { color: var(--amber); letter-spacing: 2px; }

/* ───── অর্ডার ফর্ম ───── */
.order-section { background: var(--brand-50); }
.order-wrap { display: grid; grid-template-columns: 1.3fr .7fr; gap: 28px; align-items: start; }
.order-box { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 32px; box-shadow: var(--shadow-md); }
.order-box h2 { margin: 0 0 4px; font-size: 28px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-top: 16px; }
.field label { font-weight: 600; font-size: 15px; color: var(--brand-ink); }
.field label small { font-weight: 400; color: var(--muted); }
.field input, .field select, .field textarea {
  font: inherit; font-size: 16px; padding: 12px 14px; border-radius: 12px;
  border: 1.5px solid var(--line); background: #FAFCFB; color: var(--ink); width: 100%;
  transition: border-color .2s, box-shadow .2s, background .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brand); background: #fff; box-shadow: 0 0 0 4px rgba(15,118,110,.12); }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.qty { display: flex; align-items: center; }
.qty button { width: 44px; height: 48px; border: 1.5px solid var(--line); background: #fff; font-size: 20px; cursor: pointer; color: var(--brand-ink); }
.qty button:hover { background: var(--brand-50); }
.qty button:first-child { border-radius: 12px 0 0 12px; }
.qty button:last-child { border-radius: 0 12px 12px 0; }
.field .qty input { width: 64px; height: 48px; text-align: center; border-radius: 0; border-left: 0; border-right: 0; }
.pay-opts { display: grid; gap: 10px; margin-top: 4px; }
.pay-opts label { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 12px; cursor: pointer; font-weight: 500; transition: border-color .2s, background .2s; }
.pay-opts label:has(input:checked) { border-color: var(--brand); background: var(--brand-50); }
.pay-opts input { accent-color: var(--brand); margin-top: 6px; }
.pay-opts small { display: block; color: var(--muted); font-weight: 400; }
.summary { background: var(--brand-ink); color: #fff; border-radius: 24px; padding: 28px; position: sticky; top: 84px; }
.summary h3 { margin: 0 0 14px; color: #fff; }
.summary .line { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px dashed rgba(255,255,255,.15); color: #A9C9C3; }
.summary .line.total { border: 0; color: #fff; font-size: 22px; font-weight: 700; padding-top: 14px; }
.summary .line.total span:last-child { color: #5EEAD4; }
.summary p { font-size: 14px; color: #A9C9C3; margin: 12px 0 0; }
.summary a { color: #5EEAD4; }
.btn-block { width: 100%; justify-content: center; margin-top: 24px; font-size: 18px; padding: 15px; cursor: pointer; }
.form-error { margin-top: 14px; padding: 10px 14px; border-radius: 10px; background: #FCEFEC; color: #B4372F; font-weight: 600; }
.order-done { text-align: center; padding: 20px 6px; }
.order-done .done-ico { font-size: 52px; }
.order-done h3 { font-size: 25px; margin: 8px 0; }
.dev-note { background: #FCEFEC; color: #B4372F; padding: 8px 12px; border-radius: 8px; font-size: 14px; }
.sticky-order { display: none; }

/* ───── প্রশ্নোত্তর ───── */
.faq { max-width: 780px; margin: 0 auto; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; margin-bottom: 12px; transition: border-color .2s, box-shadow .2s; }
.faq details[open] { border-color: var(--brand-100); box-shadow: var(--shadow-sm); }
.faq summary { font-weight: 600; cursor: pointer; list-style: none; position: relative; padding-right: 28px; color: var(--brand-ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: -3px; font-size: 24px; color: var(--brand); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 10px 0 0; color: var(--muted); }

/* ───── ধাপ ───── */
.steps { counter-reset: s; }
.steps .card { position: relative; padding-top: 38px; margin-top: 18px; }
.steps .card::before {
  counter-increment: s; content: counter(s, bengali);
  position: absolute; top: -20px; left: 28px; width: 42px; height: 42px; border-radius: 12px;
  background: var(--brand); color: #fff; font-weight: 700; display: grid; place-items: center; font-size: 20px;
  box-shadow: 0 8px 18px -6px rgba(15,118,110,.55);
}

/* ───── রেট টেবিল ───── */
.table-scroll { overflow-x: auto; }
.rate-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-sm); }
.rate-table th, .rate-table td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.rate-table th { background: var(--brand); color: #fff; font-weight: 600; }
.rate-table tr:last-child td { border-bottom: 0; }
.rate-table tbody tr:hover { background: #FAFCFB; }
.rate-table td:last-child { font-weight: 700; white-space: nowrap; color: var(--brand); }

/* ───── চলমান টিকার (হোম) ───── */
.ticker { padding: 0; overflow: hidden; border-block: 1px solid var(--line); background: #fff; }
.ticker-track { display: flex; gap: 44px; width: max-content; padding: 16px 0; animation: marquee 40s linear infinite; }
.ticker-track span { color: var(--muted); font-weight: 500; white-space: nowrap; font-size: 16px; }
.ticker-track span b { color: var(--brand); margin-right: 10px; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* অ্যাডমিন থেকে চালু করা নোটিশ ব্যানার */
.notice-bar { display: block; background: var(--amber-50); color: var(--amber-ink); text-align: center; padding: 10px 16px; font-weight: 600; font-size: 15px; border-bottom: 1px solid #F5E3BC; text-decoration: none; }
a.notice-bar:hover { background: #FBEFD2; }
.hero h1 .plain { color: inherit; }

/* ───── স্ক্রলে আলতো ভেসে ওঠা ───── */
.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* লোকালে "এডিট করুন" জায়গা চিহ্নিত */
.dev [data-todo] { outline: 2px dashed #E2544D; outline-offset: 3px; position: relative; }
.dev [data-todo]::after { content: "✎ " attr(data-todo); position: absolute; top: -12px; right: 0; background: #E2544D; color: #fff; font-size: 11px; padding: 1px 6px; border-radius: 6px; z-index: 2; white-space: nowrap; font-weight: 600; line-height: 1.5; font-family: "Hind Siliguri", sans-serif; }

/* ───── রেসপন্সিভ ───── */
@media (max-width: 900px) {
  .hero .wrap, .coaching, .book-hero .wrap, .order-wrap { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .nav-toggle { display: grid; place-items: center; }
  .nav-cta { margin-left: auto; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; gap: 2px; background: #fff; padding: 8px 16px 16px; border-bottom: 1px solid var(--line); box-shadow: 0 16px 30px -16px rgba(11,46,43,.2); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 16px; }
  .summary { position: static; }
  footer .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .hero { padding: 48px 0 64px; }
  .row-2 { grid-template-columns: 1fr; }
  .samples { grid-template-columns: 1fr 1fr; }
  .toc { columns: 1; }
  .book-card { grid-template-columns: 90px 1fr; }
  .book-hero .cover { width: min(210px, 62%); }
  .order-box { padding: 22px; }
  .coaching .box { padding: 28px; }
  .sticky-order { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 9; gap: 12px; align-items: center; justify-content: space-between; padding: 10px 16px; background: #fff; border-top: 1px solid var(--line); box-shadow: 0 -8px 24px -12px rgba(11,46,43,.2); }
  .sticky-order b { color: var(--brand); font-size: 20px; font-family: "Anek Bangla", sans-serif; }
  .has-sticky { padding-bottom: 72px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}