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;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--desk:#070c12;--shelf:#111823;--rule:#1c2733;--ink:#f2f5fa;--ink-2:#95b2bc;--primary:#22d3ee;--on-primary:#04131a;--primary-soft:#22d3ee1f;--mark:#22d3ee;--focus:#22d3ee;--danger:#f77170;--danger-soft:#f771701f;--cta:#22d3ee;--on-cta:#04131a;--hl-bg:#12323c;--hl-ink:#22d3ee;--glow:#0a2431;--shadow:0 24px 48px -24px #000000e6;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.when-dark{display:none}:root[data-theme=dark] .when-dark{display:inline}:root[data-theme=dark] .when-light{display:none}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .when-dark{display:inline}:root:not([data-theme=light]) .when-light{display:none}}[data-paper]{--on-tone:#fff;--tone-soft:#ffffff1a;--tone-foot:#00000042;--tone-track:#ffffff2e;--edge:inset 0 0 0 1px var(--accent)}[data-paper=bangla-1st]{--tone:#2e1208;--accent:#d97706}[data-paper=bangla-2nd]{--tone:#191810;--accent:#fdba74}[data-paper^=english]{--tone:#00133c;--accent:#7aa2ff;--edge:0 0 #0000}[data-paper^=ict]{--tone:#064e3b;--accent:#10b981}html{background:var(--desk) radial-gradient(1100px 620px at 88% -8%, var(--glow), transparent 70%) no-repeat;-webkit-text-size-adjust:100%;scroll-padding-top:80px}body{color:var(--ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;background:0 0;min-height:100dvh;line-height:1.6}a,button,label{touch-action:manipulation}button,.course,.chip,.row,.site-nav,.paper-head{-webkit-user-select:none;user-select:none}:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:6px}::selection{background:var(--brand);color:var(--brand-ink)}html{scrollbar-color:var(--rule) transparent}.wordmark{font-family:var(--font-display);letter-spacing:-.02em;font-size:23px;font-weight:700;line-height:1}.wordmark span{color:var(--mark)}.tone{background-color:var(--tone);color:#fff;background-image:linear-gradient(160deg,#ffffff24,#0000 45%,#0000002e);box-shadow:inset 0 0 0 1px #ffffff1f}.site-nav{z-index:30;padding-top:env(safe-area-inset-top);background:var(--desk);position:sticky;top:0}@supports (color:color-mix(in lab, red, red)){.site-nav{background:color-mix(in srgb, var(--desk) 88%, transparent)}}.site-nav{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.nav-link{min-height:44px;color:var(--ink-2);border-radius:999px;align-items:center;padding:0 14px;font-weight:500;transition:color .15s,background-color .15s;display:none}@media (min-width:640px){.nav-link{display:inline-flex}}@media (hover:hover) and (pointer:fine){.nav-link:hover{color:var(--ink);background:var(--shelf)}}.nav-btn{background:var(--shelf);min-width:44px;min-height:44px;transition:transform .14s var(--ease-out), background-color .15s ease;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:0 12px;font-weight:600;display:inline-flex}.nav-btn:active{transform:scale(.96)}@media (hover:hover) and (pointer:fine){.nav-btn:hover{background:var(--rule)}}.hero-h{font-family:var(--font-display);letter-spacing:-.025em;text-wrap:balance;font-size:clamp(2.5rem,9.6vw,4.6rem);font-weight:700;line-height:1.04}.hero-h .hl{background:var(--hl-bg);color:var(--hl-ink);border-radius:.14em;margin-top:.08em;padding:.04em .16em 0;line-height:1.12;display:inline-block}.hero-sub{color:var(--ink-2);text-wrap:pretty;max-width:34rem;font-size:clamp(1.05rem,2.6vw,1.25rem);line-height:1.65}.free-link{background:var(--shelf);min-height:44px;transition:transform .14s var(--ease-out), background-color .15s 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.cover[data-k="2"]{filter:brightness(.7);transform:rotate(16deg)translate(48px)}.stage .cover[data-k="3"]{filter:brightness(.82);transform:rotate(-12deg)translate(-38px)}@media (hover:hover) and (pointer:fine){.stage .cover:not([data-k="0"]):hover{filter:brightness()}}@starting-style{.stage .cover{transform:rotate(0)translate(0)}}.stage .page{color:#f2f5fa;width:min(330px,88%);height:420px;transition:transform .16s var(--ease-out);background:#070c12;border:1px solid #2a3644;border-radius:20px;display:block;position:absolute;top:0;left:50%;overflow:hidden;translate:-50%;box-shadow:0 40px 80px -30px #000000d9}.stage .page:active{transform:scale(.985)}.page-bar{z-index:2;color:#9daab8;background:#070c12;border-bottom:1px solid #2a3644;justify-content:space-between;align-items:center;gap:10px;height:46px;padding:0 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em{color:#fff}.page-text table{border-collapse:collapse;width:100%;font-size:12.5px}.page-text th,.page-text td{text-align:left;vertical-align:top;border:1px solid #2a3644;padding:4px 6px}.page-text th{color:#f3d99b;background:#16202c}.page-scroll{display:block}.page-body[data-on] .page-scroll{animation:60s linear infinite page-scroll}.page:after{content:"";z-index:1;pointer-events:none;background:linear-gradient(#0000,#070c12 70%);height:110px;position:absolute;inset:auto 0 0}.page-cta{z-index:2;color:#04131a;white-space:nowrap;background:#22d3ee;border-radius:999px;padding:8px 16px;font-size:14px;font-weight:600;position:absolute;bottom:16px;left:50%;translate:-50%}@keyframes page-scroll{to{transform:translateY(-50%)}}@media (min-width:1024px){.stage{height:560px}.stage .page{width:360px;height:540px}.stage .cover{width:290px;height:440px;margin-left:-145px;top:60px}}.brackets{position:relative}.brackets:before,.brackets:after{content:"";border:2px solid var(--primary);pointer-events:none;z-index:3;width:22px;height:22px;position:absolute}.brackets:before{border-bottom:0;border-right:0;border-radius:8px 0 0;top:-10px;left:-10px}.brackets:after{border-top:0;border-left:0;border-radius:0 0 8px;bottom:-10px;right:-10px}.mono{font-family:var(--font-mono), ui-monospace, monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--primary);font-variant-numeric:tabular-nums;font-size:13px}.counter{justify-content:space-between;align-items:center;margin-top:14px;padding:0 4px;display:flex}.counter .mono:last-child{color:var(--ink-2)}.dots{z-index:3;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:18px;display:flex;position:relative}.dot{background:var(--shelf);min-height:40px;color:var(--ink-2);transition:color .15s ease, background-color .15s ease, transform .14s var(--ease-out);border-radius:999px;padding:0 14px;font-size:14px;font-weight:600;position:relative;overflow:hidden}.dot:before{content:"";background:var(--tone);vertical-align:1px;border-radius:2px;width:8px;height:8px;margin-right:8px;display:inline-block;box-shadow:0 0 0 1px #ffffff59}.dot:active{transform:scale(.96)}.dot[aria-pressed=true]{color:var(--ink)}.dot-fill{background:var(--tone);transform-origin:0;height:3px;animation:4.5s linear forwards dot-fill;position:absolute;inset:auto 0 0}.showcase[data-paused] .dot-fill{animation-play-state:paused}@keyframes dot-fill{0%{transform:scaleX(0)}to{transform:scaleX(1)}}@media (hover:hover) and (pointer:fine){.dot:hover{color:var(--ink)}}.facts{color:var(--ink-2);flex-wrap:wrap;gap:8px 24px;font-size:15px;display:flex}.facts b{color:var(--ink);font-weight:600}.facts li{align-items:center;gap:8px;display:flex}.facts li:before{content:"";background:var(--ink);border-radius:3px;width:6px;height:6px}.sec-h{font-family:var(--font-display);letter-spacing:-.02em;text-wrap:balance;font-size:clamp(2rem,5vw,3rem);font-weight:700;line-height:1.08}.chip{background:var(--shelf);min-height:44px;color:var(--ink);transition:background-color .15s ease, color .15s ease, transform .14s var(--ease-out);border-radius:999px;padding:0 18px;font-size:15px;font-weight:600}.chip:active{transform:scale(.96)}.chip[aria-pressed=true]{background:var(--ink);color:var(--desk)}.course{background-color:var(--tone);color:var(--on-tone);box-shadow:var(--edge,0 0 #0000);transition:transform .2s var(--ease-out), box-shadow .24s ease;background-image:linear-gradient(165deg,#ffffff1a,#0000 42%);border-radius:22px;flex-direction:column;display:flex;position:relative;overflow:hidden}:root[data-theme=dark] [data-paper^=english]{--edge:inset 0 0 0 1px #78a0ff52, 0 18px 36px -20px #285adc73}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) [data-paper^=english]{--edge:inset 0 0 0 1px #78a0ff52, 0 18px 36px -20px #285adc73}}a.course:active{transform:scale(.98)}@media (hover:hover) and (pointer:fine){a.course:hover{box-shadow:var(--edge,0 0 #0000), var(--shadow);transform:translateY(-4px)}a.course:hover .go{transform:translate(3px)}}.course-top{justify-content:space-between;align-items:center;gap:12px;padding:18px 20px 0;font-size:14px;display:flex}.course-tag{background:var(--tone-soft);border-radius:999px;padding:2px 10px}.course-body{flex-direction:column;flex:1;padding:16px 20px 18px;display:flex}.course-name{font-family:var(--font-display);letter-spacing:-.02em;font-size:44px;font-weight:700;line-height:1}.course-paper{font-family:var(--font-display);margin-top:4px;font-size:22px;font-weight:600;line-height:1.2}.course-desc{color:var(--on-tone);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-top:10px;font-size:15px;line-height:1.55;display:-webkit-box;overflow:hidden}.course-meter{margin-top:auto;padding-top:18px;font-size:14px}.meter{background:var(--tone-track);border-radius:3px;height:6px;overflow:hidden}.meter>span,.progress>span{transform-origin:0;height:100%;transition:transform .3s var(--ease-out);display:block}.meter>span{background:var(--accent)}.course-foot{background:var(--tone-foot);color:#fff;justify-content:space-between;align-items:center;gap:12px;min-height:62px;padding:10px 12px 10px 20px;display:flex}.price{font-family:var(--font-display);font-size:24px;font-weight:700;line-height:1}.pill-free{background:linear-gradient(180deg, var(--accent), var(--accent));border-radius:999px;align-items:center;gap:7px;min-height:40px;padding:0 14px 0 12px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.pill-free{background:linear-gradient(180deg, color-mix(in srgb, var(--accent) 30%, transparent), color-mix(in srgb, var(--accent) 14%, transparent))}}.pill-free{box-shadow:inset 0 0 0 1px var(--accent), inset 0 1px 0 #ffffff2e, 0 6px 18px -8px var(--accent)}@supports (color:color-mix(in lab, red, red)){.pill-free{box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--accent) 65%, transparent), inset 0 1px 0 #ffffff2e, 0 6px 18px -8px var(--accent)}}.pill-free{color:#fff;white-space:nowrap;font-size:14px;font-weight:600;transition:box-shadow .2s}.pill-free svg{width:17px;height:17px}.pill-free .lead{color:var(--accent)}.pill-free .go{transition:transform .2s var(--ease-out)}@media (hover:hover) and (pointer:fine){a.course:hover .pill-free{box-shadow:inset 0 0 0 1px var(--accent), inset 0 1px 0 #ffffff38, 0 8px 24px -8px var(--accent)}}.pill-quiet{background:#ffffff29;border-radius:999px;align-items:center;min-height:40px;padding:0 14px;font-size:14px;font-weight:600;display:inline-flex}.course[data-soon]{background-image:linear-gradient(165deg,#ffffff1a,#0000 42%),repeating-linear-gradient(135deg,#ffffff0d 0 10px,#0000 10px 20px)}.papers{margin-top:20px}.shelf-group+.shelf-group{margin-top:28px}.shelf-h{font-family:var(--font-display);margin-bottom:12px;font-size:24px;font-weight:700;line-height:1.2}.shelf{overscroll-behavior-x:contain;scroll-snap-type:x mandatory;scrollbar-width:none;grid-auto-columns:82%;grid-auto-flow:column;gap:12px;margin:0 -16px;padding:0 16px 6px;scroll-padding:0 16px;display:grid;overflow-x:auto}.shelf::-webkit-scrollbar{display:none}.shelf>li{scroll-snap-align:start;display:flex}.shelf>li>.course{flex:1}@media (min-width:640px){.papers{grid-template-columns:repeat(2,1fr);gap:16px;margin-top:24px;display:grid}.shelf-group,.shelf{display:contents}.shelf-group+.shelf-group{margin-top:0}.shelf-h{display:none}}@media (min-width:1024px){.papers{grid-template-columns:repeat(3,1fr)}}.continue{background:var(--shelf);min-height:76px;transition:transform .16s var(--ease-out), background-color .15s ease;border-radius:18px;align-items:center;gap:14px;padding:12px 16px 12px 12px;display:flex}.continue:active{transform:scale(.98)}@media (hover:hover) and (pointer:fine){a.continue:hover{background:var(--rule)}}.continue-tile{width:52px;height:52px;font-family:var(--font-display);border-radius:12px;flex:none;place-items:center;font-size:24px;font-weight:700;display:grid}.acc-meter{background:var(--rule);border-radius:3px;height:6px;overflow:hidden}.acc-meter>span{background:var(--tone);transform-origin:0;height:100%;display:block}.steps{counter-reset:step;gap:12px;display:grid}@media (min-width:768px){.steps{grid-template-columns:repeat(3,1fr)}}.steps li{counter-increment:step;background:var(--shelf);border-radius:22px;padding:22px}.steps li:before{content:counter(step, bengali);background:var(--ink);width:2.75rem;height:2.75rem;color:var(--desk);font-family:var(--font-display);border-radius:999px;place-items:center;margin-bottom:16px;font-size:22px;font-weight:700;display:grid}.site-foot{border-top:1px solid var(--rule);padding-bottom:env(safe-area-inset-bottom)}.site-foot a{color:var(--ink-2)}@media (hover:hover) and (pointer:fine){.site-foot a:hover{color:var(--ink)}}.site-foot .muted{color:var(--ink-2)}@media (prefers-reduced-motion:reduce){.page-body[data-on] .page-scroll,.dot-fill{animation:none}.stage .cover,.page-body{transition:none}}.offline{top:calc(10px + env(safe-area-inset-top));z-index:40;border:1px solid var(--rule);background:var(--shelf);width:fit-content;color:var(--ink);text-align:center;transition:transform .26s var(--ease-out), opacity .26s ease;border-radius:999px;margin-inline:auto;padding:10px 16px;font-size:14px;font-weight:500;position:fixed;left:16px;right:16px;box-shadow:0 12px 28px -10px #00000073}@starting-style{.offline{opacity:0;transform:translateY(-120%)}}@media (prefers-reduced-motion:reduce){.offline{transition:opacity .2s}@starting-style{.offline{transform:none}}}.help{right:16px;bottom:calc(16px + env(safe-area-inset-bottom));z-index:25;border:1px solid var(--rule);background:var(--shelf);min-height:48px;color:var(--ink);transition:transform .14s var(--ease-out);border-radius:999px;align-items:center;gap:8px;padding:0 18px 0 14px;font-size:14px;font-weight:600;display:inline-flex;position:fixed;box-shadow:0 12px 28px -10px #00000073}.help:active{transform:scale(.96)}:root:has(.buy-bar) .help{bottom:calc(92px + env(safe-area-inset-bottom))}:root:has(.reader) .help{display:none}.policy h2{font-family:var(--font-display);margin-top:2.2em;font-size:24px;font-weight:700;line-height:1.25}.policy p,.policy 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li.on{background:var(--gold-soft)}.ch-list .meta{color:var(--ink-2);font-variant-numeric:tabular-nums;flex:none;align-items:center;gap:8px;font-size:13px;display:inline-flex}.ch-list .free{color:var(--gold);background:var(--gold-soft);border-radius:999px;padding:1px 8px;font-weight:600}.perks{gap:10px;display:grid}.perks li{animation:perk-in .3s var(--ease-out) both;animation-delay:calc(var(--i) * 45ms + 60ms);align-items:flex-start;gap:10px;line-height:1.5;display:flex}.perks .tick{background:var(--gold-soft);width:22px;height:22px;color:var(--gold);border-radius:999px;flex:none;place-items:center;margin-top:1px;display:grid}.perks .tick svg{width:14px;height:14px}@keyframes perk-in{0%{opacity:0;transform:translateY(6px)}}.offer-foot{margin-top:20px}@media (max-width:639px){.offer-foot{bottom:calc(-1 * env(safe-area-inset-bottom));padding:16px 24px calc(24px + env(safe-area-inset-bottom));background:linear-gradient(to bottom, transparent, var(--desk) 16px);margin:20px -24px -24px;position:sticky}}.flip{display:inline-flex;transform:scaleX(-1)}.flip svg{width:16px;height:16px}@media (prefers-reduced-motion:reduce){.stage{animation:.2s fade-in}.perks li{animation:.2s both fade-in}@keyframes fade-in{0%{opacity:0}}}.avatar{object-fit:cover;box-shadow:0 0 0 2px var(--gold);border-radius:9999px;flex-shrink:0;display:inline-block}.avatar-letter{background:var(--gold);color:#070c12;place-items:center;font-size:.8em;font-weight:700;display:inline-grid}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}