/* ----------------------------------------------------------------------------
 * File    : app.css
 * Path    : [project-root]/assets/front/css/app.css
 * Purpose : Public website styles on top of Bootstrap 5 - recreates the
 *           "Education Master" look (navy + orange, mega menu, slider,
 *           tiles, event dates, footer). Colours come from Admin > Settings
 *           via CSS variables --primary / --accent set in the layout.
 * -------------------------------------------------------------------------- */
:root{--primary:#002147;--accent:#f36b3b;--ink:#203245;--muted:#6c7a89;--line:#e6e9ee;--soft:#f4f6f9;--radius:6px}
html{scroll-behavior:smooth}
body{font-family:"Open Sans",system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Bengali",sans-serif;color:var(--ink);font-size:15px;line-height:1.65;background:#fff}
a{color:var(--primary);text-decoration:none}a:hover{color:var(--accent)}
h1,h2,h3,h4,h5{color:var(--primary);font-weight:700}
img{max-width:100%;height:auto}
.text-accent{color:var(--accent)!important}.bg-primary-brand{background:var(--primary)!important}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.btn-accent:hover,.btn-accent:focus{background:color-mix(in srgb,var(--accent) 85%,#000);border-color:color-mix(in srgb,var(--accent) 85%,#000);color:#fff}
.btn-outline-light-2{border:2px solid #fff;color:#fff;font-weight:600}.btn-outline-light-2:hover{background:#fff;color:var(--primary)}
.btn-primary-brand{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.btn-primary-brand:hover{background:color-mix(in srgb,var(--primary) 80%,#000);color:#fff}
.skip-link{position:absolute;left:-999px;top:0;background:#fff;padding:8px 12px;z-index:2000}.skip-link:focus{left:8px}

/* ---------- Top bar ---------- */
.topbar{background:var(--primary);color:#c9d3e0;font-size:13px}
.topbar a{color:#c9d3e0}.topbar a:hover{color:#fff}
.topbar .tb-social a{display:inline-flex;width:28px;height:28px;align-items:center;justify-content:center}
.topbar .btn-sm{font-size:12px;padding:3px 12px;border-radius:2px}

/* ---------- Header + nav ---------- */
.site-header{background:#fff;box-shadow:0 2px 12px rgba(0,33,71,.08);position:sticky;top:0;z-index:1030}
.site-header .container{position:relative}
.brand img{max-height:52px;width:auto}
.brand .brand-text{font-weight:800;color:var(--primary);font-size:20px;line-height:1.1}
.brand .brand-text small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.main-nav{display:flex;align-items:stretch;gap:2px;margin:0;padding:0;list-style:none}
.main-nav>li{position:static}
.main-nav>li.has-dd{position:relative}
.main-nav>li>a{display:flex;align-items:center;gap:4px;height:84px;padding:0 12px;font-weight:600;color:#1a1a1a;font-size:15.5px;border-bottom:3px solid transparent;white-space:nowrap}
.main-nav>li>a:hover,.main-nav>li.active>a,.main-nav>li.open>a{color:var(--accent);border-bottom-color:var(--accent)}
.main-nav>li>a .bi-chevron-down{font-size:11px}
.dd-panel{position:absolute;top:100%;left:0;min-width:240px;background:#fff;box-shadow:0 14px 34px rgba(0,33,71,.16);border-top:3px solid var(--accent);padding:8px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:50;list-style:none;margin:0}
.dd-panel a{display:block;padding:8px 20px;color:#333;font-size:14.5px}
.dd-panel a:hover{background:var(--soft);color:var(--accent);padding-left:24px}
.mega-panel{position:absolute;left:12px;right:12px;top:100%;background:#fff;box-shadow:0 18px 40px rgba(0,33,71,.18);border-top:3px solid var(--accent);padding:28px 24px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:50}
.mega-col h6{font-size:14px;letter-spacing:.04em;text-transform:uppercase;color:var(--primary);padding-bottom:10px;margin-bottom:10px;border-bottom:1px solid var(--line)}
.mega-col+.mega-col{border-left:1px solid var(--line)}
.mega-col ul{list-style:none;padding:0;margin:0}
.mega-col li a{display:flex;align-items:center;gap:8px;padding:6px 0;color:#333;font-size:14.5px}
.mega-col li a:before{content:"\203A";color:var(--muted);font-size:18px;line-height:1}
.mega-col li a:hover{color:var(--accent);transform:translateX(3px)}
@media (hover:hover){.main-nav>li:hover>.dd-panel,.main-nav>li:hover>.mega-panel{opacity:1;visibility:visible;transform:none}}
.main-nav>li:focus-within>.dd-panel,.main-nav>li:focus-within>.mega-panel,.main-nav>li.open>.dd-panel,.main-nav>li.open>.mega-panel{opacity:1;visibility:visible;transform:none}
.nav-toggle{border:0;background:var(--primary);color:#fff;width:44px;height:44px;border-radius:4px;font-size:24px}
.header-cta{margin-left:10px}

/* Mobile off-canvas menu */
.offcanvas-nav .offcanvas-header{background:var(--primary);color:#fff}
.m-nav{list-style:none;margin:0;padding:0}
.m-nav li{border-bottom:1px solid var(--line)}
.m-nav a,.m-nav button{display:flex;width:100%;justify-content:space-between;align-items:center;padding:12px 18px;color:#1a1a1a;font-weight:600;background:none;border:0;text-align:left;font-size:15px}
.m-nav ul{list-style:none;padding:0;background:var(--soft)}
.m-nav ul a,.m-nav ul button{padding-left:32px;font-weight:500}
.m-nav ul ul a{padding-left:46px}
.m-nav .m-col-title{padding:10px 32px 4px;font-size:12px;text-transform:uppercase;color:var(--muted);letter-spacing:.05em}
.m-nav button[aria-expanded=true] .bi{transform:rotate(180deg)}

/* ---------- Search band ---------- */
.search-band{background:var(--primary);padding:14px 0}
.search-band .form-control{border-radius:2px 0 0 2px;height:46px;border:0}
.search-band .btn{border-radius:0 2px 2px 0;height:46px;padding:0 22px;text-transform:uppercase;font-size:13px}

/* ---------- Hero slider ---------- */
.hero .carousel-item{height:clamp(320px,62vh,620px);background:#0b1b33}
.hero .carousel-item img{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero .carousel-caption{inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0 8%}
.hero h1,.hero h2{color:#fff;font-weight:800;text-transform:uppercase;font-size:clamp(26px,4.6vw,52px);letter-spacing:.02em;text-shadow:0 2px 10px rgba(0,0,0,.35)}
.hero p{font-size:clamp(14px,1.7vw,19px);max-width:760px;margin:6px auto 22px;text-shadow:0 1px 6px rgba(0,0,0,.4)}
.hero .btn{padding:11px 26px;border-radius:2px;text-transform:uppercase;font-size:14px;margin:4px}
.hero .carousel-control-prev,.hero .carousel-control-next{width:6%}
.hero-static{background:var(--primary);color:#fff;padding:80px 0;text-align:center}

/* ---------- Sections ---------- */
.section{padding:72px 0}.section-soft{background:var(--soft)}
.section-title{text-align:center;margin-bottom:42px}
.section-title h2{font-size:clamp(26px,3.2vw,36px);margin-bottom:8px}
.section-title h2 span{color:var(--accent)}
.section-title p{color:var(--muted);max-width:720px;margin:0 auto}

/* Quick-link tiles */
.tile{position:relative;display:block;border-radius:var(--radius);overflow:hidden;aspect-ratio:5/3;background:var(--primary)}
.tile img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.tile:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,33,71,.35),rgba(0,33,71,.78))}
.tile span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;padding:10px;color:#fff;font-weight:700;font-size:17px;z-index:1}
.tile:hover img{transform:scale(1.08)}

/* Welcome block */
.welcome-img{border-radius:var(--radius);box-shadow:0 16px 40px rgba(0,33,71,.18)}
.principal{background:#fff;border-left:4px solid var(--accent);padding:18px 20px;border-radius:var(--radius);box-shadow:0 6px 18px rgba(0,33,71,.07)}
.principal img{width:64px;height:64px;border-radius:50%;object-fit:cover}

/* Counters */
.stats{background:linear-gradient(rgba(0,33,71,.92),rgba(0,33,71,.92)),var(--stats-bg,none) center/cover;color:#fff;padding:52px 0}
.stat-num{font-size:clamp(30px,4vw,44px);font-weight:800;color:var(--accent);line-height:1}
.stat-label{text-transform:uppercase;letter-spacing:.06em;font-size:13px;opacity:.9;margin-top:6px}

/* Update columns (notice / events / news) */
.col-head{background:var(--primary);color:#fff;padding:18px 20px;border-radius:var(--radius) var(--radius) 0 0;display:flex;justify-content:space-between;align-items:center}
.col-head h3{color:#fff;font-size:19px;margin:0}
.col-head a{color:#fff;font-size:13px;opacity:.85}
.col-body{border:1px solid var(--line);border-top:0;border-radius:0 0 var(--radius) var(--radius);background:#fff}
.list-item{display:flex;gap:14px;padding:14px 16px;border-bottom:1px solid var(--line)}
.list-item:last-child{border-bottom:0}
.list-item h4{font-size:15px;margin:0 0 3px;line-height:1.35}
.list-item h4 a{color:var(--primary)}.list-item h4 a:hover{color:var(--accent)}
.list-item p{margin:0;font-size:13px;color:var(--muted)}
.date-box{flex:0 0 58px;height:62px;background:var(--primary);color:#fff;text-align:center;border-radius:4px;display:flex;flex-direction:column;justify-content:center;line-height:1.1}
.date-box b{font-size:22px}.date-box small{font-size:11px;text-transform:uppercase}
.date-box.accent{background:var(--accent)}
.thumb-sm{flex:0 0 72px;height:62px;border-radius:4px;object-fit:cover}
.badge-new{background:var(--accent);font-size:10px;vertical-align:middle}

/* Gallery */
.g-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
.g-grid a{display:block;border-radius:4px;overflow:hidden;aspect-ratio:1/1;background:var(--soft)}
.g-grid img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.g-grid a:hover img{transform:scale(1.07)}

/* CTA band */
.cta{background:var(--accent);color:#fff;padding:42px 0}
.cta h2{color:#fff;font-size:clamp(20px,2.6vw,28px);text-transform:uppercase;margin-bottom:6px}
.cta p{margin:0;opacity:.95}
.cta .btn{border:2px solid #fff;color:#fff;border-radius:30px;padding:10px 26px;font-weight:600}
.cta .btn:hover{background:#fff;color:var(--accent)}

/* ---------- Inner page header ---------- */
.page-head{background:linear-gradient(rgba(0,33,71,.86),rgba(0,33,71,.86)),var(--head-bg,none) center/cover;color:#fff;padding:52px 0 44px}
.page-head h1{color:#fff;font-size:clamp(24px,3.4vw,38px);margin:0 0 6px}
.page-head .breadcrumb{margin:0;font-size:14px}
.page-head .breadcrumb a{color:#c9d3e0}.page-head .breadcrumb-item.active{color:var(--accent)}
.page-head .breadcrumb-item+.breadcrumb-item:before{color:#8fa0b6}

/* Content */
.content-body{font-size:16px}
.content-body h2,.content-body h3,.content-body h4{margin-top:1.4em}
.content-body img{border-radius:var(--radius);margin:10px 0}
.content-body table{width:100%;border-collapse:collapse;margin:16px 0;display:block;overflow-x:auto}
.content-body th,.content-body td{border:1px solid var(--line);padding:8px 10px}
.content-body th{background:var(--soft)}
.content-body iframe{max-width:100%;aspect-ratio:16/9;height:auto;width:100%}
.content-body .ql-align-center{text-align:center}.content-body .ql-align-right{text-align:right}.content-body .ql-align-justify{text-align:justify}
.side-box{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-bottom:24px;background:#fff}
.side-box h5{background:var(--primary);color:#fff;margin:0;padding:13px 16px;font-size:16px}
.card-post{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;height:100%;background:#fff;transition:.2s}
.card-post:hover{box-shadow:0 12px 30px rgba(0,33,71,.12);transform:translateY(-3px)}
.card-post .cp-img{aspect-ratio:16/10;object-fit:cover;width:100%}
.card-post .cp-body{padding:18px}
.card-post h3{font-size:17px;line-height:1.35}
.meta{font-size:13px;color:var(--muted)}
.notice-row{display:flex;gap:16px;align-items:center;padding:14px 0;border-bottom:1px dashed var(--line)}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 8px 26px rgba(0,33,71,.06)}
.form-control:focus,.form-select:focus{border-color:var(--accent);box-shadow:0 0 0 .2rem color-mix(in srgb,var(--accent) 22%,transparent)}
.hp{position:absolute!important;left:-9999px!important;height:0;overflow:hidden}
.info-line{display:flex;gap:12px;margin-bottom:16px}
.info-line i{width:42px;height:42px;flex:0 0 42px;border-radius:50%;background:var(--soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:18px}
.map-frame{width:100%;height:340px;border:0;border-radius:var(--radius)}

/* ---------- Footer ---------- */
.site-footer{background:var(--primary);color:#b8c4d4;font-size:14px;padding-top:60px}
.site-footer h5{color:#fff;font-size:15px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:18px}
.site-footer a{color:#b8c4d4}.site-footer a:hover{color:var(--accent)}
.f-links{list-style:none;padding:0;margin:0;columns:2;column-gap:16px}
.f-links li{margin-bottom:8px;break-inside:avoid}
.f-social a{display:inline-flex;width:36px;height:36px;border:1px solid rgba(255,255,255,.3);border-radius:50%;align-items:center;justify-content:center;margin-right:6px;color:#fff}
.f-social a:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.f-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:44px;padding:18px 0;font-size:13px}
.f-bottom .ver{background:rgba(255,255,255,.1);border-radius:20px;padding:2px 10px;font-size:12px}
.to-top{position:fixed;right:16px;bottom:16px;width:42px;height:42px;border-radius:50%;background:var(--accent);color:#fff;display:none;align-items:center;justify-content:center;z-index:1040;box-shadow:0 6px 16px rgba(0,0,0,.2)}
.to-top.show{display:flex}.to-top:hover{color:#fff}
.wa-float{position:fixed;left:16px;bottom:16px;width:48px;height:48px;border-radius:50%;background:#25d366;color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;z-index:1040;box-shadow:0 6px 16px rgba(0,0,0,.2)}
.wa-float:hover{color:#fff}

/* Lightbox */
.lb{position:fixed;inset:0;background:rgba(0,0,0,.9);display:none;align-items:center;justify-content:center;z-index:2000;padding:20px}
.lb.show{display:flex}.lb img{max-height:86vh;max-width:96vw;border-radius:4px}
.lb button{position:absolute;background:none;border:0;color:#fff;font-size:34px}
.lb .lb-close{top:10px;right:16px}.lb .lb-prev{left:8px}.lb .lb-next{right:8px}
.lb .lb-cap{position:absolute;bottom:16px;left:0;right:0;text-align:center;color:#fff}

/* ---------- Responsive ---------- */
@media (max-width:1199.98px){.main-nav>li>a{padding:0 8px;font-size:14.5px}}
@media (max-width:991.98px){
  .site-header .brand img{max-height:44px}
  .section{padding:52px 0}
  .mega-col+.mega-col{border-left:0}
}
@media (max-width:575.98px){
  body{font-size:14.5px}
  .topbar .tb-contact{display:none!important}
  .section{padding:42px 0}.section-title{margin-bottom:28px}
  .hero .btn{padding:9px 16px;font-size:12px}
  .g-grid{grid-template-columns:repeat(3,1fr);gap:6px}
  .f-links{columns:1}
  .form-card{padding:18px}
}
@media print{.topbar,.site-header,.site-footer,.to-top,.wa-float{display:none!important}}