:root{--aise:#376f66;--aise-deep:#193f3a;--aise-dark:#172432;--aise-soft:#edf5f2;--aise-paper:#f7f4ec;--aise-blue:#edf7fa;--ink:#1f2a36;--muted:#66766f;--line:#dde5e1;--white:#fff;--shadow:0 14px 36px rgba(27,55,49,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--ink);font-family:"Anek Bangla","Inter",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
body,button,input{font-family:"Anek Bangla","Inter",Arial,sans-serif}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.tutorial-container{width:min(1240px,calc(100% - 48px));margin:0 auto}
[data-lang="en"]{display:none!important}
html[data-language="en"] [data-lang="bn"]{display:none!important}
html[data-language="en"] [data-lang="en"]{display:revert!important}
html[data-language="en"] body{font-family:"Inter","Anek Bangla",Arial,sans-serif;line-height:1.65}
.skip-link{position:fixed;left:16px;top:-80px;background:var(--aise-dark);color:#fff;padding:10px 16px;z-index:9999;border-radius:0 0 8px 8px}.skip-link:focus{top:0}
.release-bar{background:#f5f2e9;color:#31524d;border-bottom:1px solid #e8e3d8;font-size:13px;font-weight:500}
.release-inner{height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.release-inner a{text-decoration:underline;text-underline-offset:3px}
.tutorial-header{height:82px;background:#fff;border-bottom:1px solid #edf0ef;position:relative;z-index:100}
.nav-inner{height:100%;display:flex;align-items:center;gap:34px}
.brand{width:165px;flex:0 0 165px;display:flex;align-items:center}.brand img{width:100%;height:42px;object-fit:contain;object-position:left center}
.primary-nav{display:flex;align-items:center;gap:30px;margin-left:16px}.primary-nav a{font-size:16px;font-weight:600;color:#26323d;white-space:nowrap}.primary-nav a:hover{color:var(--aise)}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.language-switch{display:flex;border:1px solid var(--line);border-radius:999px;padding:3px;background:#fff}.language-switch button{border:0;background:transparent;border-radius:999px;padding:7px 12px;color:#586761;font-size:13px;font-weight:700;cursor:pointer}.language-switch button.active{background:var(--aise);color:#fff}
.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 19px;border-radius:4px;border:1px solid transparent;font-size:14px;font-weight:600;cursor:pointer;transition:.2s ease}.button-primary{background:var(--aise);color:#fff}.button-primary:hover{background:var(--aise-deep);color:#fff}.button-outline{border-color:#26323d;background:#fff;color:#26323d}.button-outline:hover{border-color:var(--aise);color:var(--aise)}.button-light{background:#fff;color:var(--aise-deep)}
.menu-toggle{display:none;border:0;background:transparent;font-size:28px;padding:5px}
.page-title{position:relative;overflow:hidden;background:var(--aise-blue);border-bottom:1px solid #e3eef0}
.page-title:before{content:"";position:absolute;inset:0;opacity:.4;background-image:linear-gradient(45deg,transparent 47%,#d4e8ec 48%,#d4e8ec 50%,transparent 51%),linear-gradient(-45deg,transparent 47%,#d4e8ec 48%,#d4e8ec 50%,transparent 51%);background-size:86px 86px}
.page-title-inner{position:relative;min-height:320px;padding:64px 0 58px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:7px;margin-bottom:7px;color:var(--aise);font-size:14px;font-weight:700}
.page-title h1{margin:0;color:var(--aise-dark);font-family:"Inter","Anek Bangla",sans-serif;font-size:clamp(42px,5vw,66px);line-height:1.08;letter-spacing:-2.2px;font-weight:700}
.page-title p{max-width:720px;margin:13px auto 0;color:#61716e;font-size:17px;line-height:1.7}
.live-release{display:flex;flex-wrap:wrap;justify-content:center;gap:0;margin-top:18px;border:1px solid rgba(55,111,102,.24);border-radius:7px;background:rgba(255,255,255,.78);box-shadow:0 8px 24px rgba(27,55,49,.06);overflow:hidden}
.live-release>span{display:flex;align-items:baseline;gap:7px;padding:8px 13px;border-right:1px solid rgba(55,111,102,.18);color:var(--aise-deep)}.live-release>span:last-child{border-right:0}.live-release small{color:#70807b;font-size:12px;font-weight:600}.live-release strong{font-family:"Inter","Anek Bangla",sans-serif;font-size:13px;font-weight:700}
.hero-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:22px}
.guide-tools{padding:52px 0 40px;background:#fff}
.quick-help{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);background:#fff;padding:25px 28px;gap:22px}
.quick-help article{display:flex;gap:14px;align-items:flex-start}.quick-icon{width:42px;height:42px;flex:0 0 42px;border-radius:50%;display:grid;place-items:center;background:var(--aise-soft);color:var(--aise);font-size:18px}.quick-help h2{margin:0 0 2px;font-size:16px;line-height:1.35;color:#2f3a45}.quick-help p{margin:0;color:#70807b;font-size:14px;line-height:1.55}
.guide-search{width:min(620px,100%);height:50px;margin:30px auto 0;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:999px;background:#fff;padding:0 16px;box-shadow:0 8px 24px rgba(27,55,49,.08);color:#71817c}.guide-search input{width:100%;height:100%;border:0;outline:0;background:transparent;font-size:15px;color:var(--ink)}.guide-search button{display:none;border:0;background:transparent;color:#66766f;cursor:pointer}.guide-search.has-value button{display:block}
.tutorial-part{padding:72px 0 86px;background:#fff}.tutorial-part.part-tint{background:var(--aise-paper)}
.part-heading{display:flex;align-items:flex-start;gap:18px;margin-bottom:40px}.part-number{width:46px;height:46px;flex:0 0 46px;border-radius:50%;display:grid;place-items:center;background:var(--aise);color:#fff;font:700 14px/1 "Inter",sans-serif}.part-heading h2{margin:-2px 0 3px;color:var(--aise-dark);font-size:clamp(34px,4vw,52px);line-height:1.12;letter-spacing:-1px}.part-heading p{margin:0;max-width:750px;color:var(--muted);font-size:15px}
.faq-shell{display:grid;grid-template-columns:290px minmax(0,1fr);gap:64px;align-items:start}
.category-rail{position:sticky;top:24px;background:#f8f9f8;border-radius:4px;overflow:hidden;border:1px solid #edf0ef}
.category-button{position:relative;width:100%;min-height:62px;display:grid;grid-template-columns:22px 1fr 16px;align-items:center;gap:11px;padding:15px 18px;border:0;border-bottom:1px solid #e9edeb;background:transparent;color:#3d4a54;text-align:left;font-size:15px;font-weight:600;cursor:pointer}.category-button:last-child{border-bottom:0}.category-button:hover{background:#f0f5f3}.category-button.active{background:var(--aise-dark);color:#fff}.category-button.active:after{content:"";position:absolute;right:-8px;top:50%;transform:translateY(-50%);border-top:8px solid transparent;border-bottom:8px solid transparent;border-left:8px solid var(--aise-dark)}.rail-arrow{font-size:12px;opacity:.7}
.category-pane{display:none}.category-pane.active{display:block}.category-title{margin:0 0 18px;padding-bottom:13px;border-bottom:2px solid var(--aise);font-size:21px;color:var(--aise-dark)}
.topic{border-bottom:1px solid var(--line)}.topic:first-child{border-top:1px solid var(--line)}.topic.hidden{display:none}.topic-toggle{width:100%;display:grid;grid-template-columns:1fr 22px;align-items:center;gap:18px;padding:20px 2px;border:0;background:transparent;color:#24313b;text-align:left;font-size:17px;line-height:1.5;font-weight:600;cursor:pointer}.topic-toggle i{font-size:14px;transition:transform .2s}.topic.open .topic-toggle i{transform:rotate(45deg)}
.topic-body{display:none;padding:0 2px 28px}.topic.open .topic-body{display:block}.topic-copy{color:#5d6c67;font-size:16px;line-height:1.8}.topic-copy p,.topic-copy ol,.topic-copy ul{margin-top:0;margin-bottom:14px}.topic-copy li{margin-bottom:5px}.topic-copy a{color:var(--aise);text-decoration:underline;text-underline-offset:2px}.topic-copy b,.topic-copy strong{color:#2b4540}.topic-copy table{width:100%;border-collapse:collapse;margin:12px 0 17px;font-size:15px}.topic-copy th,.topic-copy td{border:1px solid #d7e0dc;padding:10px 12px;vertical-align:top;text-align:left}.topic-copy th{background:var(--aise-soft);color:var(--aise-deep)}
.guide-note,.guide-warning,.guide-success{display:flex;gap:10px;align-items:flex-start;margin:16px 0;padding:12px 14px;border-left:3px solid var(--aise);background:var(--aise-soft);color:#43615a}.guide-warning{border-color:#c28a2d;background:#fff8e8;color:#755719}.guide-success{border-color:#4c8b66;background:#eef8f1}
.tutorial-media{margin-top:23px}.media-drag-hint{display:flex;align-items:center;justify-content:flex-end;gap:7px;margin:0 0 9px;color:#647872;font-size:13px;font-weight:600}.tutorial-media-gallery{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding:2px 2px 12px;cursor:grab;user-select:none;touch-action:pan-y;overscroll-behavior-inline:contain;scrollbar-color:#91aaa4 #edf3f1}.tutorial-media-gallery.single{cursor:default}.tutorial-media-gallery.dragging{cursor:grabbing;scroll-snap-type:none}.tutorial-media-item{flex:0 0 82%;margin:0;scroll-snap-align:start}.tutorial-media-gallery.single .tutorial-media-item{flex-basis:100%}.tutorial-media-item>a{display:block}.tutorial-media-item img,.tutorial-media-item video,.media-placeholder{display:block;width:100%;border-radius:7px;border:1px solid #dbe4e0;background:#101414;object-fit:contain}.tutorial-media-item img,.tutorial-media-item video{height:auto;max-height:680px;-webkit-user-drag:none;user-select:none}.media-placeholder{aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:30px;color:#68807a;background-color:#f4f7f6;background-image:linear-gradient(135deg,rgba(55,111,102,.025) 25%,transparent 25%),linear-gradient(225deg,rgba(55,111,102,.025) 25%,transparent 25%),linear-gradient(45deg,rgba(55,111,102,.025) 25%,transparent 25%),linear-gradient(315deg,rgba(55,111,102,.025) 25%,#f4f7f6 25%);background-size:28px 28px;background-position:14px 0,14px 0,0 0,0 0}.media-placeholder-icon{display:flex;gap:8px;margin-bottom:10px;font-size:29px;color:#88a49e}.media-placeholder strong{font-size:16px}.media-placeholder small{font-size:13px;color:#80918d}.media-caption{margin:9px 0 0;color:#71817c;font-size:13px;line-height:1.55;text-align:center}
.no-results{text-align:center;padding:50px 20px;color:#75847f}.no-results i{font-size:32px}.no-results h3{margin:10px 0 0}.no-results p{margin:3px 0}
.support-section{padding:58px 0;background:#fff}.support-card{min-height:150px;border-radius:8px;background:#214d46;color:#fff;padding:31px 38px;display:flex;align-items:center;justify-content:space-between;gap:30px}.support-card h2{margin:0 0 2px;font-size:32px;color:#fff}.support-card p{margin:0;max-width:760px;color:rgba(255,255,255,.72)}
.tutorial-footer{background:#183832;color:rgba(255,255,255,.68)}.footer-grid{display:grid;grid-template-columns:1.8fr .8fr .9fr;gap:70px;padding:52px 0}.footer-brand img{width:170px;filter:brightness(0) invert(1);margin-bottom:15px}.footer-grid p{max-width:420px;margin:0}.footer-grid h3{font-size:17px;color:#fff;margin:0 0 12px}.footer-grid a{display:block;color:rgba(255,255,255,.75);margin:4px 0}.footer-grid a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0}.footer-bottom .tutorial-container{display:flex;justify-content:space-between;gap:20px;font-size:13px}.footer-bottom a{color:#fff;text-decoration:underline}
@media(max-width:1050px){.primary-nav{gap:18px;margin-left:0}.full-pdf{padding-left:12px;padding-right:12px}.faq-shell{grid-template-columns:250px minmax(0,1fr);gap:40px}}
@media(max-width:900px){.tutorial-header{height:auto;min-height:72px}.nav-inner{min-height:72px;flex-wrap:wrap;gap:12px;padding:12px 0}.brand{width:145px;flex-basis:145px}.menu-toggle{display:block;margin-left:auto}.nav-actions{margin-left:0}.primary-nav{display:none;order:4;flex-basis:100%;flex-direction:column;align-items:stretch;gap:0;padding:10px 0;border-top:1px solid var(--line)}.primary-nav.open{display:flex}.primary-nav a{padding:9px 0}.quick-help{grid-template-columns:1fr}.faq-shell{grid-template-columns:1fr;gap:26px}.category-rail{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.category-button.active:after{display:none}.footer-grid{grid-template-columns:1.5fr 1fr 1fr;gap:30px}}
@media(max-width:640px){.tutorial-container{width:min(100% - 28px,1240px)}.release-inner{height:auto;min-height:36px;padding:7px 0}.release-inner>a{display:none}.nav-actions .full-pdf{display:none}.page-title-inner{min-height:300px;padding:48px 0}.page-title h1{font-size:39px;letter-spacing:-1.2px}.page-title p{font-size:15px}.live-release{width:100%}.live-release>span{flex:1 1 50%;justify-content:center;border-bottom:1px solid rgba(55,111,102,.18)}.live-release>span:nth-child(even){border-right:0}.live-release>span:nth-last-child(-n+2){border-bottom:0}.hero-actions{width:100%}.hero-actions .button{flex:1 1 46%}.guide-tools{padding:34px 0}.quick-help{padding:20px}.tutorial-part{padding:50px 0 60px}.part-heading{gap:12px;margin-bottom:28px}.part-number{width:38px;height:38px;flex-basis:38px}.part-heading h2{font-size:31px}.category-rail{grid-template-columns:1fr}.topic-toggle{font-size:16px;padding:17px 0}.topic-copy{font-size:15px}.topic-copy table{display:block;overflow-x:auto}.support-card{padding:25px;align-items:flex-start;flex-direction:column}.support-card h2{font-size:27px}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom .tutorial-container{flex-direction:column}.media-placeholder{min-height:190px}.tutorial-media-item{flex-basis:96%}}
@media print{.release-bar,.tutorial-header,.guide-tools,.hero-actions,.category-rail,.support-section,.tutorial-footer,.media-drag-hint{display:none!important}.page-title{background:#fff}.page-title:before{display:none}.page-title-inner{min-height:0;padding:30px 0}.live-release{box-shadow:none}.tutorial-part{padding:30px 0}.faq-shell{display:block}.category-pane{display:block!important;margin-bottom:30px}.topic-body{display:block!important}.media-placeholder{display:none}.topic{break-inside:avoid}.part-tint{background:#fff!important}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}