:root{
  --bg:#f6f8fb;
  --card:#fff;
  --text:#152238;
  --muted:#6b7280;
  --line:#e5e7eb;
  --primary:#0f766e;
  --primary2:#115e59;
  --radius:18px;
  --dark:#0f172a;
  --content-max:1180px;
  --gutter:clamp(11px,2.2vw,32px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%;max-width:100%}
body{margin:0;min-width:0;max-width:100%;overflow-x:hidden;font-family:system-ui,-apple-system,"Segoe UI","Noto Sans Bengali",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}
main,header,footer,section,nav,div,article,aside{min-width:0}
a{color:inherit;text-decoration:none;overflow-wrap:anywhere}
img,svg,video,canvas,iframe,embed,object{max-width:100%}
img{height:auto;display:block}
button,input,select,textarea{max-width:100%;font:inherit}
button{touch-action:manipulation}
.wrap{width:min(var(--content-max),calc(100% - (var(--gutter) * 2)));margin-inline:auto;min-width:0}

.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{min-height:68px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;white-space:nowrap;min-width:0;flex:0 1 auto}
.brand img{height:40px;width:auto;max-width:min(240px,34vw);object-fit:contain}
.brand-mark{width:40px;height:40px;flex:0 0 40px;border-radius:12px;display:grid;place-items:center;background:var(--primary);color:#fff}
.header-search{display:flex;flex:1 1 320px;min-width:0;max-width:650px;margin-left:auto}
.header-search input{flex:1 1 auto;min-width:0;border:1px solid var(--line);border-radius:12px 0 0 12px;padding:12px 14px;font-size:15px;background:#fff}
.header-search button,.btn{border:0;background:var(--primary);color:#fff;padding:12px 18px;border-radius:0 12px 12px 0;font-weight:700;cursor:pointer;min-height:44px}
.btn{border-radius:12px;display:inline-flex;align-items:center;justify-content:center;max-width:100%;text-align:center}
.btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
.desktop-nav{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.nav-link{font-weight:700;white-space:nowrap}

.hero{padding:54px 0 30px}
.hero-box{background:linear-gradient(135deg,#ecfeff,#f0fdf4);border:1px solid #d1fae5;border-radius:28px;padding:clamp(24px,3.6vw,48px);overflow:hidden}
.eyebrow{display:inline-flex;padding:6px 10px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:12px;font-weight:800;color:var(--primary2);margin-bottom:14px;max-width:100%;white-space:normal}
.hero h1{font-size:clamp(32px,4.2vw,60px);line-height:1.08;margin:0 0 14px;overflow-wrap:anywhere}
.hero p{font-size:clamp(16px,1.3vw,19px);color:var(--muted);max-width:760px}
.hero-search{display:flex;max-width:760px;margin-top:24px;min-width:0}
.hero-search input{flex:1 1 auto;min-width:0;border:1px solid var(--line);padding:16px;border-radius:14px 0 0 14px;font-size:16px}
.hero-search button{border:0;background:var(--primary);color:#fff;padding:0 24px;border-radius:0 14px 14px 0;font-weight:800;min-height:48px}
.hero-actions{margin-top:16px;display:flex;flex-wrap:wrap;gap:10px}

.section{padding:24px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px;min-width:0}
.section h2{margin:0;font-size:clamp(23px,2.2vw,30px);overflow-wrap:anywhere}
.text-link{font-weight:800;color:var(--primary);flex:0 0 auto}
.muted{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr));gap:16px}
.card{min-width:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:transform .2s,box-shadow .2s;overflow:hidden}
@media (hover:hover) and (pointer:fine){.card:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(15,23,42,.07)}}
.class-card .num{width:52px;height:52px;border-radius:16px;background:#ecfdf5;display:grid;place-items:center;font-weight:900;color:var(--primary);font-size:21px;margin-bottom:18px}
.card h3{margin:0 0 8px;overflow-wrap:anywhere}
.lesson-card{display:flex;flex-direction:column;min-height:170px}
.lesson-thumb{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;margin-bottom:14px}
.badge{display:inline-block;align-self:flex-start;max-width:100%;border-radius:999px;background:#ecfdf5;color:var(--primary2);padding:6px 10px;font-size:12px;font-weight:700;margin-bottom:12px;white-space:normal;overflow-wrap:anywhere}
.breadcrumbs{font-size:14px;color:var(--muted);padding:20px 0 0;overflow-wrap:anywhere}
.page-head{padding:20px 0}
.page-head h1{margin:0 0 8px;font-size:clamp(28px,3.3vw,46px);line-height:1.15;overflow-wrap:anywhere}
.search-panel{background:#fff;border:1px solid var(--line);padding:16px;border-radius:16px;margin-bottom:18px;overflow:hidden}
.search-panel form{display:flex;min-width:0}
.search-panel input{flex:1 1 auto;min-width:0;padding:12px 14px;border:1px solid var(--line);border-radius:10px 0 0 10px;font-size:16px}
.search-panel button{border:0;background:var(--primary);color:#fff;padding:0 18px;border-radius:0 10px 10px 0;min-height:44px}

.presentation-shell{width:100%;max-width:100%;background:#0b1220;border-radius:20px;overflow:hidden;box-shadow:0 18px 55px rgba(15,23,42,.2)}
.presentation-top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;color:#fff;padding:12px 14px;background:#111827;overflow-wrap:anywhere}
.presentation-top button{flex:0 0 auto;border:1px solid #374151;background:#1f2937;color:#fff;border-radius:10px;padding:10px 14px;cursor:pointer;min-height:44px}
.slide-stage{position:relative;width:100%;aspect-ratio:16/9;background:#000;overflow:hidden}
.slide-stage iframe{position:absolute;inset:0;width:100%;height:100%;max-width:none;border:0}
.slide-stage:fullscreen,.slide-stage:-webkit-full-screen{width:100vw;height:100vh;aspect-ratio:auto;border-radius:0}
.lesson-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:16px}
.lesson-nav a{min-width:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;overflow-wrap:anywhere}
.lesson-nav a:last-child{text-align:right}
.content-card{min-width:0;background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;overflow-wrap:anywhere;overflow:hidden}
.content-card table{display:block;max-width:100%;overflow-x:auto}
.content-card pre{max-width:100%;overflow:auto}

.ad-box{width:100%;max-width:100%;margin:20px auto;display:flex;justify-content:center;overflow:hidden}
.ad-box>a{max-width:100%}
.ad-box img{max-width:100%;width:auto;height:auto;max-height:250px;object-fit:contain}
.ad-code{width:100%;max-width:100%;overflow:hidden;text-align:center}
.ad-code iframe,.ad-code ins,.ad-code div{max-width:100%!important}
.pagination{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:26px 0;max-width:100%}
.pagination a{min-width:40px;height:40px;padding:0 12px;display:grid;place-items:center;border:1px solid var(--line);background:#fff;border-radius:10px}
.pagination a.active{background:var(--primary);color:#fff}
.empty{padding:40px;text-align:center;background:#fff;border:1px dashed var(--line);border-radius:16px;color:var(--muted);overflow-wrap:anywhere}

/* Video library: familiar viewing patterns, custom visual language */
.video-library-head{padding:34px 0 8px}
.video-library-head .wrap{display:flex;align-items:end;justify-content:space-between;gap:24px}
.video-library-head h1{font-size:clamp(30px,4vw,54px);line-height:1.12;margin:0 0 8px;overflow-wrap:anywhere}
.video-search{display:flex;flex:0 1 480px;width:min(480px,100%);min-width:0}
.video-search input{flex:1 1 auto;min-width:0;padding:13px 14px;border:1px solid var(--line);border-radius:12px 0 0 12px;font-size:16px;background:#fff}
.video-search button{border:0;background:var(--dark);color:#fff;padding:0 18px;border-radius:0 12px 12px 0;font-weight:800;min-height:46px}
.video-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(255px,100%),1fr));gap:24px 16px}
.video-card{min-width:0;max-width:100%}
.video-thumb{position:relative;aspect-ratio:16/9;background:#111827;border-radius:16px;overflow:hidden}
.video-thumb img{width:100%;height:100%;object-fit:cover}
.play-chip{position:absolute;left:12px;bottom:12px;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:rgba(15,23,42,.88);color:#fff;font-size:14px;padding-left:2px}
.video-card-body{padding:11px 4px 0;min-width:0}
.video-card h3{font-size:16px;line-height:1.35;margin:0 0 7px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}
.video-card-meta{font-size:13px;color:var(--muted);overflow-wrap:anywhere}
.video-tags-line{font-size:12px;color:var(--primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:6px 0 0}
.video-view-wrap{display:grid;grid-template-columns:minmax(0,1fr) clamp(300px,22vw,400px);gap:clamp(18px,2vw,30px);padding-top:26px;align-items:start}
.video-main-column{min-width:0}
.video-player-shell{width:100%;max-width:100%;background:#05070b;border-radius:18px;overflow:hidden}
.video-player{position:relative;aspect-ratio:16/9;overflow:hidden}
.video-player iframe{position:absolute;inset:0;width:100%;height:100%;max-width:none;border:0}
.video-details{padding:18px 2px;min-width:0}
.video-details h1{font-size:clamp(22px,2.2vw,34px);line-height:1.25;margin:0 0 10px;overflow-wrap:anywhere}
.video-facts{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:14px}
.video-facts span+span:before{content:'•';margin-right:10px}
.hashtag-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.hashtag-row a{max-width:100%;font-size:13px;padding:7px 10px;border-radius:999px;background:#e9f7f4;color:var(--primary2);font-weight:750;overflow-wrap:anywhere}
.resource-buttons{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0;max-width:100%}
.resource-btn{display:inline-flex;align-items:center;gap:8px;max-width:100%;padding:11px 15px;border-radius:12px;background:#fff;border:1px solid var(--line);font-weight:800;box-shadow:0 2px 8px rgba(15,23,42,.04);overflow-wrap:anywhere}
.resource-btn span{width:24px;height:24px;flex:0 0 24px;border-radius:8px;background:#eef2f7;display:grid;place-items:center}
.resource-btn.type-watch{background:#0f172a;color:#fff;border-color:#0f172a}
.resource-btn.type-watch span{background:#263449}
.resource-btn.type-download{border-color:#b7e4db}
.video-description{min-width:0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin-top:14px;overflow:hidden;overflow-wrap:anywhere}
.video-description h2{font-size:18px;margin:0 0 8px}
.video-description p{margin:0;line-height:1.75}
.video-description img,.video-description iframe{max-width:100%}
.video-sidebar{min-width:0;max-width:100%}
.related-head h2{font-size:20px;margin:8px 0 14px}
.related-video-list{display:grid;gap:14px}
.related-video{display:grid;grid-template-columns:minmax(110px,150px) minmax(0,1fr);gap:11px;min-width:0}
.related-video img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:11px;background:#111}
.related-video h3{font-size:14px;line-height:1.35;margin:2px 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}
.related-video span{font-size:12px;color:var(--muted)}
.search-results{display:grid;gap:12px}
.search-result-item{display:grid;grid-template-columns:minmax(120px,180px) minmax(0,1fr);gap:16px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:12px;min-width:0;overflow:hidden}
.search-result-item img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:10px}
.search-result-item h3{margin:0 0 6px;overflow-wrap:anywhere}
.search-result-item.no-image{grid-template-columns:1fr}

.footer{margin-top:48px;background:#0f172a;color:#dbeafe;overflow:hidden}
.footer-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr);gap:30px;padding:42px 0}
.footer-grid>*{min-width:0;overflow-wrap:anywhere}
.footer a{display:block;margin:8px 0;color:#cbd5e1}
.copyright{text-align:center;border-top:1px solid #263449;padding:16px var(--gutter);overflow-wrap:anywhere}
.mobile-bottom{display:none}

/* Large desktops, TV browsers, interactive boards and ultrawide monitors */
@media (min-width:1440px){
  :root{--content-max:1360px;--gutter:clamp(24px,2.4vw,42px)}
  .header-search{max-width:740px}
  .grid{gap:20px}
  .video-grid{gap:28px 20px}
}
@media (min-width:1800px){
  :root{--content-max:1600px}
  .nav{min-height:76px}
  .brand img{height:46px}
  .brand-mark{width:46px;height:46px;flex-basis:46px}
  .header-search{max-width:860px}
  .header-search input{font-size:17px;padding:14px 16px}
  .header-search button{padding-inline:22px}
  .grid{grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:22px}
  .video-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:30px 22px}
  .card{padding:22px}
  .video-view-wrap{grid-template-columns:minmax(0,1fr) clamp(360px,21vw,440px)}
}
@media (min-width:2400px){
  :root{--content-max:1880px;--gutter:48px}
  .hero-box{padding:54px}
  .grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
  .video-grid{grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:32px 24px}
  .section{padding-block:30px}
  .footer-grid{gap:48px;padding-block:52px}
}
@media (min-width:3200px){
  :root{--content-max:2200px;--gutter:64px}
  body{font-size:18px}
  .header-search{max-width:980px}
  .grid{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
  .video-grid{grid-template-columns:repeat(auto-fit,minmax(350px,1fr))}
  .video-card h3{font-size:18px}
  .video-card-meta{font-size:14px}
}

/* Tablets and medium displays */
@media (max-width:1100px){
  .desktop-nav{display:none}
  .video-view-wrap{grid-template-columns:1fr}
  .video-sidebar{border-top:1px solid var(--line);padding-top:12px}
  .related-video-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-box{padding:30px}
}
@media (max-width:820px){
  .video-library-head .wrap{align-items:stretch;flex-direction:column;gap:14px}
  .video-search{flex-basis:auto;width:100%;max-width:none}
  .footer-grid{grid-template-columns:1fr}
}

/* Phones and compact tablet portrait */
@media (max-width:700px){
  body{padding-bottom:calc(66px + env(safe-area-inset-bottom))}
  :root{--gutter:11px}
  .site-header{position:sticky}
  .nav{min-height:58px;gap:10px}
  .brand span:last-child{display:none}
  .brand img{height:34px;max-width:92px}
  .brand-mark{width:36px;height:36px;flex-basis:36px}
  .header-search{max-width:none;flex-basis:0}
  .header-search input{font-size:16px;padding:10px}
  .header-search button{padding:10px 12px}
  .hero{padding:20px 0 10px}
  .hero-box{border-radius:20px;padding:24px 18px}
  .hero h1{font-size:clamp(30px,10vw,36px)}
  .hero p{font-size:16px}
  .hero-search{display:none}
  .section-head{align-items:center}
  .grid{grid-template-columns:1fr}
  .section h2{font-size:23px}
  .card{padding:18px}
  .presentation-shell{border-radius:0;margin-left:calc(var(--gutter) * -1);margin-right:calc(var(--gutter) * -1);width:calc(100% + (var(--gutter) * 2))}
  .presentation-top{font-size:13px}
  .slide-stage{aspect-ratio:16/9}
  .lesson-nav{grid-template-columns:1fr}
  .lesson-nav a:last-child{text-align:left}
  .content-card{padding:18px}
  .footer-grid{grid-template-columns:1fr}
  .mobile-bottom{position:fixed;display:flex;bottom:0;left:0;right:0;min-height:62px;height:calc(62px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line);z-index:50;justify-content:space-around;align-items:flex-start;padding:5px 6px env(safe-area-inset-bottom)}
  .mobile-bottom a{display:flex;flex:1 1 0;min-width:0;min-height:52px;flex-direction:column;justify-content:center;align-items:center;font-size:21px;color:var(--primary)}
  .mobile-bottom span{font-size:11px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
  .footer{margin-top:28px}
  .video-library-head{padding:22px 0 4px}
  .video-library-head h1{font-size:32px}
  .video-search{margin-top:2px}
  .video-grid{display:block}
  .video-card{display:block;margin:0 calc(var(--gutter) * -1) 22px;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-bottom:12px}
  .video-thumb{border-radius:0;width:100%}
  .video-card-body{padding:12px 14px 0}
  .video-card h3{font-size:17px}
  .play-chip{left:14px}
  .video-view-wrap{width:100%;padding-top:0;gap:10px}
  .video-player-shell{border-radius:0}
  .video-details{padding:14px 12px}
  .video-details h1{font-size:21px}
  .video-description{border-radius:12px;padding:15px}
  .resource-buttons{gap:8px;overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px;-webkit-overflow-scrolling:touch}
  .resource-btn{white-space:nowrap;flex:0 0 auto}
  .video-sidebar{padding:10px 12px}
  .related-video-list{grid-template-columns:1fr}
  .related-video{grid-template-columns:minmax(110px,145px) minmax(0,1fr)}
  .search-result-item{grid-template-columns:minmax(105px,120px) minmax(0,1fr);padding:9px;gap:10px}
  .video-home-section .video-grid{display:block}
  .ad-box{margin:14px auto}
  .ad-box img{max-height:180px}
}

/* Very small phones / watch-class webviews: keep everything usable and unbroken */
@media (max-width:420px){
  :root{--gutter:8px}
  .nav{gap:7px;min-height:54px}
  .brand img{height:30px;max-width:66px}
  .brand-mark{width:32px;height:32px;flex-basis:32px;border-radius:9px}
  .header-search input{padding:9px 8px;min-width:0}
  .header-search button{padding-inline:9px}
  .hero-box{padding:20px 14px}
  .hero h1{font-size:clamp(27px,10vw,32px)}
  .section-head{align-items:flex-start;flex-direction:column;gap:6px}
  .text-link{align-self:flex-start}
  .page-head h1{font-size:clamp(25px,9vw,32px)}
  .search-panel{padding:10px}
  .presentation-top{align-items:stretch;flex-direction:column}
  .presentation-top button{width:100%}
  .resource-buttons{margin-inline:-2px}
  .related-video{grid-template-columns:112px minmax(0,1fr);gap:9px}
  .search-result-item{grid-template-columns:100px minmax(0,1fr)}
  .pagination{gap:6px}
  .pagination a{min-width:36px;height:36px;padding-inline:9px}
}
@media (max-width:340px){
  body{font-size:14px}
  .header-search button{font-size:0;min-width:40px;padding:8px}
  .header-search button::before{content:'⌕';font-size:20px;line-height:1}
  .header-search input{font-size:16px}
  .hero{padding-top:12px}
  .hero-box{padding:16px 12px;border-radius:16px}
  .hero h1{font-size:26px}
  .card,.content-card{padding:14px}
  .related-video,.search-result-item{grid-template-columns:1fr}
  .related-video img,.search-result-item img{width:100%}
  .mobile-bottom span{font-size:10px}
}

/* Short landscape screens: preserve usable vertical space */
@media (max-height:520px) and (orientation:landscape) and (max-width:1000px){
  .site-header{position:relative}
  .mobile-bottom{display:none}
  body{padding-bottom:0}
  .hero{padding-top:12px}
  .presentation-top{padding-block:8px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}


/* === Final mobile/tablet alignment + search suggestions + video fullscreen === */
.search-suggest-form{position:relative}
.search-suggestions{position:absolute;z-index:120;top:calc(100% + 7px);left:0;right:0;width:100%;max-height:min(360px,70vh);overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 45px rgba(15,23,42,.16);padding:6px;text-align:left}
.search-suggestions[hidden]{display:none!important}
.search-suggestion-item{display:grid;grid-template-columns:36px minmax(0,1fr) 24px;align-items:center;gap:9px;min-height:54px;padding:8px 10px;border-radius:10px;color:var(--text)}
.search-suggestion-item.active{background:#ecfdf5}
.search-suggestion-icon{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;background:#f1f5f9;color:var(--primary);font-weight:900}
.search-suggestion-copy{display:block;min-width:0}
.search-suggestion-copy strong{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-suggestion-copy small{display:block;margin-top:2px;font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-suggestion-arrow{color:var(--muted);text-align:center}
@media (hover:hover) and (pointer:fine){.search-suggestion-item:hover{background:#f8fafc}}

.video-player-shell{position:relative}
.video-fullscreen-btn{position:absolute;z-index:5;right:10px;top:10px;display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:8px 11px;border:1px solid rgba(255,255,255,.28);border-radius:10px;background:rgba(5,7,11,.72);color:#fff;font-size:12px;font-weight:800;cursor:pointer;backdrop-filter:blur(6px)}
.video-player-shell:fullscreen,.video-player-shell:-webkit-full-screen{width:100vw;height:100vh;max-width:none;border-radius:0;background:#000}
.video-player-shell:fullscreen .video-player,.video-player-shell:-webkit-full-screen .video-player{width:100%;height:100%;aspect-ratio:auto}
.video-player-shell:fullscreen .video-player iframe,.video-player-shell:-webkit-full-screen .video-player iframe{width:100%;height:100%}

@media (max-width:1100px){
  .wrap,.video-view-wrap,.video-main-column,.video-sidebar{margin-left:auto;margin-right:auto}
  .video-view-wrap{justify-items:center}
  .video-main-column,.video-sidebar{width:100%;max-width:900px}
  .video-grid,.grid{justify-content:center;justify-items:center}
  .video-card,.card{width:100%}
}

@media (max-width:820px){
  main>.wrap,main section>.wrap,.video-library-head>.wrap{margin-inline:auto}
  .video-library-head .wrap{width:min(var(--content-max),calc(100% - (var(--gutter) * 2)));margin-inline:auto}
  .video-grid{width:100%;margin-inline:auto;justify-items:center}
  .video-card{width:100%;max-width:680px;margin-inline:auto}
  .video-view-wrap{width:min(var(--content-max),calc(100% - (var(--gutter) * 2)));margin-inline:auto}
  .video-player-shell,.video-details,.video-description,.video-sidebar{margin-left:auto;margin-right:auto}
}

@media (max-width:700px){
  .video-grid,.video-home-section .video-grid{display:flex;flex-direction:column;align-items:center;width:100%;margin-inline:auto}
  .video-card{display:block;width:100%;max-width:680px;margin:0 auto 22px;padding-bottom:12px;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
  .video-thumb{width:100%;margin-inline:auto;border-radius:0}
  .video-card-body{width:100%;margin-inline:auto}
  .video-view-wrap{width:100%;max-width:100%;margin-inline:auto;padding-inline:var(--gutter)}
  .video-main-column,.video-sidebar,.video-player-shell,.video-details,.video-description{width:100%;max-width:680px;margin-left:auto;margin-right:auto}
  .video-player-shell{border-radius:12px}
  .grid{width:100%;margin-inline:auto;justify-items:center}
  .grid>.card{width:100%;max-width:680px;margin-inline:auto}
  .search-suggestions{position:absolute;left:0;right:0;max-height:min(310px,60vh);border-radius:12px}
  .video-fullscreen-btn{right:7px;top:7px;min-height:36px;padding:7px 9px}
  .video-fullscreen-btn span{display:none}
}

@media (max-width:420px){
  .search-suggestion-item{grid-template-columns:32px minmax(0,1fr) 20px;gap:7px;padding:7px}
  .search-suggestion-icon{width:30px;height:30px}
}

/* Autocomplete dropdowns must be allowed to extend below their search boxes. */
.hero-box,.search-panel{overflow:visible}

/* === Native mobile classroom + lesson resources + unified fullscreen === */
.mobile-hero-art,.mobile-quick-actions{display:none}
.video-card-categories,.video-detail-categories{display:flex;flex-wrap:wrap;gap:6px}
.video-card-categories{margin:0 0 7px}
.video-card-categories span,.video-detail-categories a{display:inline-flex;align-items:center;min-height:26px;padding:4px 9px;border-radius:999px;background:#eaf3ff;color:#0f4c81;font-size:11px;font-weight:800}
.video-detail-categories{margin-top:14px}
.video-category-chips{display:flex;gap:8px;overflow-x:auto;padding:10px 0 4px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.video-category-chips::-webkit-scrollbar{display:none}
.video-category-chips a{flex:0 0 auto;min-height:38px;display:inline-flex;align-items:center;padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--text);font-size:13px;font-weight:800;white-space:nowrap}
.video-category-chips a.active{background:#0f4c81;color:#fff;border-color:#0f4c81}
.lesson-description{line-height:1.8;overflow-wrap:anywhere}
.lesson-resource-block{margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}
.lesson-resource-block h2{font-size:19px;margin:0 0 12px}
.resource-buttons-lesson{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:10px}
.resource-buttons-lesson .resource-btn{justify-content:flex-start;min-height:54px;background:#f8fbff;border-color:#d7e8fb;box-shadow:none}
.resource-buttons-lesson .resource-btn span{background:#e5f0ff;color:#0f4c81}
.resource-buttons-lesson .resource-btn.type-watch{background:#0f4c81;border-color:#0f4c81;color:#fff}
.resource-buttons-lesson .resource-btn.type-watch span{background:rgba(255,255,255,.16);color:#fff}
.resource-buttons-lesson .resource-btn.type-download{background:#f2fbf4;border-color:#ccebd3}
.resource-buttons-lesson .resource-btn.type-download span{background:#dff4e4;color:#217a36}
.resource-buttons-lesson .resource-btn.type-details{background:#fff8ea;border-color:#f6dfad}
.resource-buttons-lesson .resource-btn.type-details span{background:#ffedc5;color:#9a5a00}

.media-fullscreen-shell{position:relative}
.fullscreen-exit-btn{display:none;position:absolute;z-index:40;top:max(10px,env(safe-area-inset-top));right:max(10px,env(safe-area-inset-right));width:46px;height:46px;border:1px solid rgba(255,255,255,.34);border-radius:50%;background:rgba(3,10,23,.78);color:#fff;font-size:32px;line-height:1;place-items:center;cursor:pointer;backdrop-filter:blur(8px);box-shadow:0 5px 18px rgba(0,0,0,.28)}
.media-fullscreen-shell:fullscreen,.media-fullscreen-shell:-webkit-full-screen,.media-fullscreen-shell.fallback-fullscreen{width:100vw;height:100vh;width:100dvw;height:100dvh;max-width:none!important;max-height:none!important;margin:0!important;border-radius:0!important;background:#000;overflow:hidden;z-index:9999}
.media-fullscreen-shell.fallback-fullscreen{position:fixed!important;inset:0!important}
.media-fullscreen-shell:fullscreen .fullscreen-exit-btn,.media-fullscreen-shell:-webkit-full-screen .fullscreen-exit-btn,.media-fullscreen-shell.fallback-fullscreen .fullscreen-exit-btn{display:grid}
.presentation-shell:fullscreen .presentation-top,.presentation-shell:-webkit-full-screen .presentation-top,.presentation-shell.fallback-fullscreen .presentation-top{display:none}
.presentation-shell:fullscreen .slide-stage,.presentation-shell:-webkit-full-screen .slide-stage,.presentation-shell.fallback-fullscreen .slide-stage{width:100%;height:100%;aspect-ratio:auto}
.presentation-shell:fullscreen .slide-stage iframe,.presentation-shell:-webkit-full-screen .slide-stage iframe,.presentation-shell.fallback-fullscreen .slide-stage iframe{width:100%;height:100%}
.video-player-shell:fullscreen .video-fullscreen-btn,.video-player-shell:-webkit-full-screen .video-fullscreen-btn,.video-player-shell.fallback-fullscreen .video-fullscreen-btn{display:none}
.video-player-shell:fullscreen .video-player,.video-player-shell:-webkit-full-screen .video-player,.video-player-shell.fallback-fullscreen .video-player{width:100%;height:100%;aspect-ratio:auto}
.video-player-shell:fullscreen .video-player iframe,.video-player-shell:-webkit-full-screen .video-player iframe,.video-player-shell.fallback-fullscreen .video-player iframe{width:100%;height:100%}
body.media-fullscreen-open{overflow:hidden;overscroll-behavior:none}
.slide-touch-note{display:none;color:#dbeafe;background:#0f172a;font-size:12px;text-align:center;padding:7px 52px 7px 12px}
.slides-iframe{touch-action:manipulation}

@media (orientation:portrait) and (max-width:900px){
  .media-fullscreen-shell.orientation-fallback{position:fixed!important;left:50%!important;top:50%!important;inset:auto!important;width:100dvh!important;height:100dvw!important;transform:translate(-50%,-50%) rotate(90deg);transform-origin:center center;border-radius:0!important}
  .media-fullscreen-shell.orientation-fallback .fullscreen-exit-btn{top:max(8px,env(safe-area-inset-left));right:max(8px,env(safe-area-inset-top))}
}

@media (max-width:700px){
  :root{--app-blue:#0f4c81;--app-blue2:#0a3e6c}
  body{background:#f4f7fb;padding-bottom:calc(70px + env(safe-area-inset-bottom))}
  .site-header{background:linear-gradient(135deg,var(--app-blue2),var(--app-blue));border-bottom:0;box-shadow:0 4px 18px rgba(15,76,129,.2);backdrop-filter:none}
  .nav{min-height:auto;flex-wrap:wrap;gap:8px;padding:9px 0 11px}
  .brand{width:100%;color:#fff;gap:9px}
  .brand span:last-child{display:block;font-size:18px;overflow:hidden;text-overflow:ellipsis}
  .brand img{height:34px;max-width:160px;filter:drop-shadow(0 1px 1px rgba(0,0,0,.1))}
  .brand-mark{background:#fff;color:var(--app-blue);border-radius:11px}
  .header-search{order:3;flex:1 1 100%;width:100%;max-width:none;margin:0}
  .header-search input{border:0;border-radius:12px 0 0 12px;background:#fff;padding:10px 12px;box-shadow:inset 0 0 0 1px rgba(15,76,129,.06)}
  .header-search button{border-radius:0 12px 12px 0;background:#dbeafe;color:#0f4c81;min-height:42px;padding:9px 13px}

  .hero{padding:14px 0 7px}
  .hero-box{position:relative;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(115px,.85fr);align-items:center;gap:8px;min-height:205px;padding:20px 14px 16px;background:linear-gradient(150deg,#0f4c81,#17669f);border:0;border-radius:20px;color:#fff;box-shadow:0 12px 28px rgba(15,76,129,.22);overflow:hidden}
  .hero-box::after{content:'';position:absolute;width:180px;height:180px;border-radius:50%;right:-75px;top:-85px;background:rgba(255,255,255,.08)}
  .hero-copy{position:relative;z-index:2;min-width:0}
  .hero .eyebrow{margin-bottom:8px;background:rgba(255,255,255,.13);border-color:rgba(255,255,255,.22);color:#fff;font-size:10px}
  .hero h1{font-size:26px;line-height:1.12;margin-bottom:8px;color:#fff}
  .hero p{font-size:13px;line-height:1.55;color:#dbeafe;margin:0}
  .hero-actions{display:none}
  .mobile-hero-art{display:block;position:relative;z-index:2;width:100%;align-self:end}
  .mobile-hero-art svg{width:100%;height:auto;max-height:150px;display:block}
  .mobile-quick-actions{display:grid;gap:10px;margin-top:8px}
  .mobile-quick-card{display:grid;grid-template-columns:48px minmax(0,1fr) 34px;align-items:center;gap:11px;min-height:86px;border:1px solid #dbeafe;border-radius:17px;padding:12px 13px;background:#eef6ff;box-shadow:0 5px 16px rgba(15,23,42,.045)}
  .mobile-quick-card.quick-videos{background:#effbf2;border-color:#d9f0df}
  .quick-icon{width:46px;height:46px;border-radius:14px;background:#dbeafe;color:#0f4c81;display:grid;place-items:center;font-size:21px;font-weight:900}
  .quick-videos .quick-icon{background:#daf2df;color:#19843a}
  .mobile-quick-card b{display:block;font-size:16px;margin-bottom:2px}
  .mobile-quick-card small{display:block;color:#64748b;font-size:12px;line-height:1.4}
  .mobile-quick-card i{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#0f4c81;color:#fff;font-size:23px;font-style:normal}
  .quick-videos i{background:#2f9e44}

  .section{padding:18px 0}
  .section-head{margin-bottom:12px}
  .section h2{font-size:20px}
  .grid{gap:11px}
  .card{border-radius:16px;padding:15px;box-shadow:0 4px 14px rgba(15,23,42,.035)}
  .class-card{display:grid;grid-template-columns:42px minmax(0,1fr);column-gap:11px;align-items:center;min-height:78px}
  .class-card .num{grid-row:1/3;width:42px;height:42px;border-radius:13px;margin:0;background:#e6f1ff;color:#0f4c81}
  .class-card h3{margin:0;font-size:16px}
  .class-card p{margin:3px 0 0;font-size:12px}

  .breadcrumbs{padding-top:12px;font-size:12px;white-space:nowrap;overflow-x:auto;scrollbar-width:none}
  .breadcrumbs::-webkit-scrollbar{display:none}
  .page-head{padding:15px 0 12px;background:#fff;border-bottom:1px solid #e7edf5}
  .page-head h1{font-size:25px}
  .lesson-page-head .badge{margin-bottom:8px}
  .lesson-view-wrap{width:100%;max-width:none;padding-inline:var(--gutter)}
  .presentation-shell{border-radius:14px;box-shadow:0 8px 24px rgba(15,23,42,.18)}
  .presentation-top{padding:8px 10px;font-size:12px;flex-direction:row;align-items:center}
  .presentation-top button{width:auto;min-height:38px;padding:7px 10px;font-size:12px}
  .slide-touch-note{display:block}
  .content-card{border-radius:15px;padding:16px}
  .lesson-resource-block h2{font-size:17px}
  .resource-buttons-lesson{grid-template-columns:1fr}
  .resource-buttons-lesson .resource-btn{width:100%;white-space:normal;line-height:1.4}

  .video-library-head{padding:18px 0 4px;background:#fff}
  .video-library-head h1{font-size:27px}
  .video-library-head .eyebrow{margin-bottom:8px}
  .video-category-chips{padding:10px 0 2px}
  .video-category-chips a{min-height:36px;padding:7px 13px}
  .video-card{border-radius:15px!important;box-shadow:0 5px 16px rgba(15,23,42,.045)}
  .video-card-body{padding:11px 12px 1px}
  .video-thumb{border-radius:0}
  .video-detail-categories{margin-top:11px}

  .mobile-bottom{height:calc(66px + env(safe-area-inset-bottom));min-height:66px;padding:4px 4px env(safe-area-inset-bottom);box-shadow:0 -5px 22px rgba(15,23,42,.08);border-top:1px solid #e4e9f0}
  .mobile-bottom a{gap:1px;color:#6b7280;font-size:20px;border-radius:12px;min-height:55px}
  .mobile-bottom a:active{background:#edf5ff;color:#0f4c81}
  .mobile-bottom .nav-icon{display:grid;place-items:center;width:28px;height:28px;font-size:21px;line-height:1;color:#0f4c81}
  .mobile-bottom .nav-label{font-size:10px;color:#475569;font-weight:700}
  .footer{margin-top:20px}
}

@media (max-width:420px){
  .hero-box{grid-template-columns:minmax(0,1.2fr) minmax(95px,.8fr);min-height:185px;padding:17px 12px}
  .hero h1{font-size:23px}
  .hero p{font-size:12px}
  .mobile-quick-card{grid-template-columns:43px minmax(0,1fr) 30px;padding:11px}
  .quick-icon{width:42px;height:42px}
  .mobile-quick-card b{font-size:15px}
  .fullscreen-exit-btn{width:42px;height:42px;font-size:29px}
}