:root{color-scheme:dark light;--bg:#0c0f15;--sf:#141922;--sf2:#1c232f;--ln:#272f3d;--tx:#e9edf4;--mu:#9aa5b8;--ac:#6c55ff;--lk:#a99bff;--gm:#a99bff;--tc:#38d6ee;--er:#ff8a8a;--hh:58px;--r:14px;
--ff:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Bengali","Hind Siliguri","Nirmala UI","Kalpurush",sans-serif}
@media(prefers-color-scheme:light){:root{--bg:#f6f7fb;--sf:#fff;--sf2:#eceff6;--ln:#dde1ea;--tx:#121622;--mu:#596277;--ac:#5236f0;--lk:#4a2fe0;--gm:#5236f0;--tc:#0a7f97;--er:#c62828}}
*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tx);font:16px/1.7 var(--ff);overflow-x:hidden;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--lk)}[hidden]{display:none!important}.w{max-width:1180px;margin:0 auto;padding:0 18px}.mu{color:var(--mu)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:2px solid var(--ac);outline-offset:3px;border-radius:6px}
.i{display:inline-flex;width:1.15em;height:1.15em;flex:none}.i svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.skip{position:absolute;left:-999px;top:8px;background:var(--ac);color:#fff;padding:8px 12px;border-radius:8px;z-index:99}.skip:focus{left:8px}

/* header */
.hd{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--ln)}
.hb{display:flex;align-items:center;gap:6px;min-height:var(--hh)}
.logo{display:flex;gap:10px;align-items:center;font-weight:800;letter-spacing:.01em;color:var(--tx);text-decoration:none;font-size:1.02rem;white-space:nowrap}
.logo b{color:var(--lk)}.logo svg{width:28px;height:28px;flex:none}
.mn{display:flex;gap:2px;margin-left:22px}
.mn a{color:var(--mu);text-decoration:none;padding:8px 13px;border-radius:10px;font-weight:600;font-size:.93rem;white-space:nowrap;transition:color .15s,background .15s}
.mn a:hover{color:var(--tx);background:var(--sf2)}.mn a[aria-current]{color:var(--tx);background:var(--sf2)}
.ib{margin-left:auto;display:inline-flex;gap:9px;align-items:center;min-width:210px;background:var(--sf);border:1px solid var(--ln);color:var(--mu);border-radius:11px;padding:9px 13px;cursor:pointer;font:inherit;font-size:.9rem;text-decoration:none;transition:border-color .15s,color .15s}
.ib:hover{border-color:var(--ac);color:var(--tx)}
.mt{display:none;background:none;border:0;color:var(--tx);cursor:pointer;padding:9px;border-radius:10px;font-size:1.2rem}.mt:hover{background:var(--sf2)}
#xp{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--ac)}
@media(max-width:720px){
 .hb{gap:2px}.mt{display:inline-flex}.ib{min-width:0;padding:9px;border-color:transparent;background:none;color:var(--tx)}.ib span:last-child{display:none}
 .mn{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;margin:0;padding:6px 14px 14px;background:var(--bg);border-bottom:1px solid var(--ln)}
 .mn.open{display:flex}.mn a{padding:13px 12px;font-size:1rem}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;font:700 .95rem/1 var(--ff);color:#fff;text-decoration:none;padding:13px 20px;border-radius:11px;background:var(--ac);transition:filter .15s}
.btn:hover{filter:brightness(1.1)}.btn.g{background:var(--sf2);color:var(--tx);box-shadow:inset 0 0 0 1px var(--ln)}.btn.g:hover{box-shadow:inset 0 0 0 1px var(--ac);filter:none}

/* home */
.intro{padding-top:34px;padding-bottom:6px}.intro h1{margin:0;font-size:clamp(1.7rem,4.4vw,2.5rem);line-height:1.15;letter-spacing:-.01em}.intro p{margin:6px 0 0;color:var(--mu);font-size:1.05rem}
.tb{position:sticky;top:var(--hh);z-index:20;margin-top:18px;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--ln)}
.tbi{display:flex;align-items:center;gap:12px;min-height:56px}
.tabs{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;padding:2px 0}.tabs::-webkit-scrollbar{display:none}
.tab{display:inline-flex;align-items:center;gap:8px;background:var(--sf);border:1px solid var(--ln);color:var(--tx);border-radius:99px;padding:8px 16px;cursor:pointer;font:600 .92rem/1.2 var(--ff);white-space:nowrap;transition:border-color .15s}
.tab:hover{border-color:var(--ac)}.tab .n{font-weight:500;color:var(--mu);font-size:.82rem}.tab .n:empty{display:none}
.tab.on{background:var(--tx);border-color:var(--tx);color:var(--bg)}.tab.on .n{color:inherit;opacity:.7}
.sres{display:flex;align-items:center;gap:14px;flex-wrap:wrap;min-width:0}.sres b{font-size:1.02rem;overflow-wrap:anywhere}.sres a{font-size:.9rem}
#latest{padding-top:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px 20px}
.card{display:flex;flex-direction:column;background:var(--sf);border:1px solid var(--ln);border-radius:var(--r);overflow:hidden;color:inherit;text-decoration:none;transition:border-color .15s}
.card:hover,.card:focus-visible{border-color:var(--ac)}.card:hover h3{color:var(--lk)}
.th{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--sf2)}.th img{width:100%;height:100%;object-fit:cover;display:block}
.pi{position:absolute;right:10px;bottom:10px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#000a;color:#fff;font-size:.95rem}.pi .i{margin-left:2px}
.cb{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.cm{display:flex;align-items:center;gap:10px;font-size:.82rem;color:var(--mu)}
.cat{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:var(--gm);text-decoration:none}.cat::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor}.cat.technology{color:var(--tc)}
a.cat:hover{text-decoration:underline}
.cb h3{margin:0;font-size:1.05rem;line-height:1.4;transition:color .15s;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.ex{margin:0;color:var(--mu);font-size:.92rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card.feat{grid-column:1/-1}
@media(min-width:780px){.card.feat{display:grid;grid-template-columns:1.4fr 1fr}.card.feat .th{aspect-ratio:auto;min-height:300px}.card.feat .cb{padding:30px 32px;justify-content:center;gap:12px}.card.feat h3{font-size:clamp(1.4rem,2.4vw,1.9rem);line-height:1.3;-webkit-line-clamp:4}.card.feat .ex{font-size:1rem;-webkit-line-clamp:4}.card.feat .pi{width:48px;height:48px;right:16px;bottom:16px;font-size:1.2rem}}
.sk{aspect-ratio:16/10;border-radius:var(--r);background:linear-gradient(100deg,var(--sf) 30%,var(--sf2) 50%,var(--sf) 70%);background-size:200% 100%;animation:shm 1.4s infinite}@keyframes shm{to{background-position:-200% 0}}
#st{min-height:1px}.msg{text-align:center;color:var(--mu);padding:36px 12px}.msg p{margin:0 0 14px}.err{color:var(--er)}
.sp{width:26px;height:26px;border:3px solid var(--ln);border-top-color:var(--ac);border-radius:50%;animation:rt .8s linear infinite;margin:26px auto}@keyframes rt{to{transform:rotate(360deg)}}

/* post */
.post{max-width:880px;margin:0 auto;padding:0 18px 10px}
.col{max-width:720px;margin:0 auto}
.bc{display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding-top:22px;font-size:.88rem;color:var(--mu)}.bc a{color:var(--mu);text-decoration:none}.bc a:hover{color:var(--tx)}
.post h1{font-size:clamp(1.65rem,4.2vw,2.45rem);line-height:1.25;letter-spacing:-.01em;margin:12px 0 12px}
.pmeta{display:flex;gap:6px 16px;align-items:center;flex-wrap:wrap;color:var(--mu);font-size:.9rem;margin-bottom:22px}
.vid{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--r);overflow:hidden}
.vid iframe,.vid>img{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:cover}.vid>img{opacity:.82}
.vid .play{position:absolute;inset:0;margin:auto;width:76px;height:76px;border-radius:50%;border:0;cursor:pointer;color:#fff;background:var(--ac);display:grid;place-items:center;font-size:1.9rem;box-shadow:0 0 0 8px #ffffff22;transition:transform .15s}.vid .play .i{margin-left:4px}.vid .play:hover{transform:scale(1.07)}
.bar{display:flex;gap:10px;margin:18px 0}
.ab{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--sf);border:1px solid var(--ln);color:var(--tx);border-radius:11px;padding:11px 18px;font:600 .92rem/1 var(--ff);cursor:pointer;text-decoration:none;transition:border-color .15s}
.ab:hover{border-color:var(--ac)}.ab.pr{background:var(--ac);border-color:var(--ac);color:#fff}.ab.pr:hover{filter:brightness(1.1)}
@media(max-width:560px){.bar{display:grid;grid-template-columns:1fr 1.15fr 1.05fr;gap:8px}.ab{padding:12px 6px;gap:6px;font-size:.84rem;white-space:nowrap}}
.bar.end{margin:34px 0 8px;padding-top:22px;border-top:1px solid var(--ln)}
.toc{border:1px solid var(--ln);background:var(--sf);border-radius:var(--r);margin:6px 0 22px}.toc summary{cursor:pointer;padding:13px 16px;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center}.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:"";width:8px;height:8px;border-right:2px solid var(--mu);border-bottom:2px solid var(--mu);transform:rotate(45deg);transition:transform .2s;margin-right:4px}.toc[open] summary::after{transform:rotate(-135deg)}
.toc ol{list-style:none;margin:0;padding:0 16px 14px}.toc li{margin:0}.toc li.h3{padding-left:16px}.toc a{display:block;padding:6px 0;color:var(--mu);text-decoration:none;font-size:.95rem;line-height:1.45}.toc a:hover{color:var(--tx)}
.art{margin:8px 0;overflow-wrap:anywhere;font-size:1.1rem;line-height:1.9}
.art>:first-child{margin-top:0}.art p{margin:0 0 1.2em}
.art h2,.art h3{line-height:1.35;margin:2em 0 .6em;scroll-margin-top:calc(var(--hh) + 16px);letter-spacing:-.005em}.art h2{font-size:1.55rem}.art h3{font-size:1.25rem}
.art ul,.art ol{padding-left:1.4em;margin:0 0 1.2em}.art li{margin:.35em 0}
.art a{color:var(--lk);text-underline-offset:3px}
.art img{max-width:100%;height:auto;border-radius:12px;display:block;margin:1.4em auto}
.art table{border-collapse:collapse;display:block;overflow-x:auto;margin:1.4em 0;font-size:.97rem;line-height:1.6}.art td,.art th{border:1px solid var(--ln);padding:9px 13px;text-align:left}.art th{background:var(--sf2)}
.art pre{background:var(--sf);border:1px solid var(--ln);padding:15px;border-radius:12px;overflow-x:auto;line-height:1.6;font-size:.92rem}.art code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em}.art :not(pre)>code{background:var(--sf2);padding:2px 6px;border-radius:6px}
.art blockquote{border-left:3px solid var(--ac);margin:1.4em 0;padding:2px 18px;color:var(--mu)}.art blockquote p:last-child{margin-bottom:0}
.art hr{border:0;border-top:1px solid var(--ln);margin:2em 0}
.rel{margin-top:44px;padding-top:30px;border-top:1px solid var(--ln)}.rel h2{font-size:1.3rem;margin:0 0 18px}
.rel .grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}.rel .ex{display:none}

/* dialogs */
dialog{background:var(--sf);color:var(--tx);border:1px solid var(--ln);border-radius:18px;padding:0;width:min(560px,94vw);max-height:88vh;box-shadow:0 24px 80px #0008}dialog::backdrop{background:#0009;backdrop-filter:blur(4px)}
.dh{display:flex;justify-content:space-between;align-items:center;padding:16px 18px 0}.dh h2{margin:0;font-size:1.1rem}
.x{background:none;border:0;color:var(--mu);cursor:pointer;padding:8px;border-radius:10px;font-size:1.15rem;display:inline-flex}.x:hover{color:var(--tx);background:var(--sf2)}
.db{padding:14px 18px 20px}
#sd{margin:7vh auto auto}.sf{display:flex;align-items:center;gap:10px;padding:8px 10px 8px 18px;border-bottom:1px solid var(--ln);color:var(--mu)}
#si{flex:1;min-width:0;background:none;border:0;color:var(--tx);font:inherit;font-size:1.05rem;padding:10px 0;outline:0}#si::placeholder{color:var(--mu)}
#sr{padding:10px;overflow-y:auto;max-height:calc(88vh - 70px);display:grid;gap:2px;align-content:start}
.sl{padding:6px 10px 2px;font-size:.82rem;font-weight:700;color:var(--mu)}
.sri{display:flex;gap:12px;align-items:center;padding:8px;border-radius:12px;color:var(--tx);text-decoration:none}.sri:hover,.sri:focus-visible{background:var(--sf2)}
.sri img{width:88px;aspect-ratio:16/9;object-fit:cover;border-radius:8px;flex:none;background:var(--sf2)}.sri b{display:block;line-height:1.4;font-size:.96rem}.sri small{color:var(--mu)}
@media(max-width:600px){
 #sd{margin:0;width:100%;max-width:100%;height:100dvh;max-height:100dvh;border-radius:0;border:0}#sr{max-height:none}
 #shd{margin:auto 0 0;width:100%;max-width:100%;border-radius:20px 20px 0 0;border-bottom:0}}
.shp{font-weight:700;line-height:1.4;margin:0 0 14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.shg{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:0 0 14px}
.sh-i{display:flex;align-items:center;gap:11px;padding:12px 14px;border-radius:12px;border:1px solid var(--ln);background:var(--sf2);color:var(--tx);text-decoration:none;font-weight:600;font-size:.93rem;transition:border-color .15s}
.sh-i::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--sc);flex:none}.sh-i:hover{border-color:var(--sc)}
.cr{display:flex;gap:8px}.cr input{flex:1;min-width:0;background:var(--bg);border:1px solid var(--ln);color:var(--tx);border-radius:11px;padding:12px 14px;font:inherit;font-size:.92rem}
#toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:var(--tx);color:var(--bg);font-weight:700;font-size:.92rem;padding:11px 20px;border-radius:99px;opacity:0;pointer-events:none;transition:.25s;z-index:80}#toast.on{opacity:1;transform:translate(-50%,0)}
#top{position:fixed;right:16px;bottom:20px;z-index:24;width:44px;height:44px;border-radius:50%;border:1px solid var(--ln);background:var(--sf);color:var(--tx);cursor:pointer;display:grid;place-items:center;opacity:0;pointer-events:none;transition:opacity .2s}#top.on{opacity:1;pointer-events:auto}#top:hover{border-color:var(--ac)}

/* footer */
.ft{border-top:1px solid var(--ln);margin-top:64px;padding:26px 0 22px}
.fg{display:flex;justify-content:space-between;align-items:center;gap:16px 28px;flex-wrap:wrap}
.ft nav{display:flex;gap:6px 22px;flex-wrap:wrap}.ft nav a{color:var(--mu);text-decoration:none;font-size:.92rem}.ft nav a:hover{color:var(--tx)}
.cp{color:var(--mu);font-size:.85rem;margin-top:18px}

/* static pages */
.pp{max-width:760px;margin:0 auto;padding:44px 18px 10px}.pp h1{font-size:clamp(1.8rem,4.6vw,2.6rem);line-height:1.2;margin:0 0 8px;letter-spacing:-.01em}.pp h1 em{font-style:normal}
.pp h2{margin:28px 0 8px;font-size:1.2rem}.pp p,.pp li{color:var(--tx);opacity:.88}.pp p.mu{color:var(--mu);opacity:1}
.glass{background:var(--sf);border:1px solid var(--ln);border-radius:var(--r);padding:8px 24px 24px}.glass h2:first-child{margin-top:18px}
.pp input,.pp textarea,.pp select{width:100%;background:var(--bg);border:1px solid var(--ln);color:var(--tx);border-radius:10px;padding:12px 13px;font:inherit}.pp input:focus,.pp textarea:focus,.pp select:focus{outline:0;border-color:var(--ac)}
.pp label{display:block;margin:14px 0 5px;color:var(--mu);font-size:.88rem}
.g404{text-align:center;padding:90px 18px}.g404 .big{font:800 clamp(5rem,20vw,9rem)/1 var(--ff);color:var(--sf2);-webkit-text-stroke:2px var(--ln)}.g404 h1{margin:6px 0 8px}.g404 p{margin:0 0 20px}.g404 .btn+.btn{margin-left:8px}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}