:root{
  --ink:#111c52; --ink2:#1f3192; --paper:#f5f7fb; --card:#fff;
  --green:#16a34a; --amber:#f5d21f; --red:#e3262f; --muted:#3d4b61; --line:#e3e8f0;
  --r:18px; --c:#1f3192; --c2:#111c52;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{min-height:100%}
body{font-family:"Hind Siliguri","Noto Sans Bengali",system-ui,sans-serif;font-size:17px;background:var(--paper);color:var(--ink);line-height:1.55;-webkit-font-smoothing:antialiased}
button{font:inherit;border:0;background:none;color:inherit;cursor:pointer}
a{color:inherit}
img{max-width:100%}
.view{display:none;min-height:100vh;animation:fadeIn .35s ease}
.view.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* Welcome */
#welcome{position:relative;overflow:hidden;background:radial-gradient(120% 80% at 50% 0%,#2a3fa8 0%,var(--ink) 62%);color:#fff;text-align:center}
#welcome.active{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 24px 70px}
.stars{position:absolute;inset:0;pointer-events:none;background-image:
  radial-gradient(1.5px 1.5px at 20% 30%,#fff8 50%,transparent 51%),radial-gradient(1px 1px at 70% 20%,#fff6 50%,transparent 51%),
  radial-gradient(1.5px 1.5px at 85% 65%,#fff7 50%,transparent 51%),radial-gradient(1px 1px at 30% 80%,#fff5 50%,transparent 51%),
  radial-gradient(1px 1px at 55% 50%,#fff4 50%,transparent 51%),radial-gradient(1.5px 1.5px at 10% 60%,#fff6 50%,transparent 51%)}
.logo-wrap{position:relative;width:min(270px,72vw);aspect-ratio:1;display:grid;place-items:center;margin-bottom:10px}
.logo-wrap:before{content:"";position:absolute;inset:8%;border-radius:50%;background:radial-gradient(circle,#ffffff3d 0%,#ffffff10 45%,transparent 70%)}
.logo-wrap img{position:relative;width:88%;height:auto;filter:drop-shadow(0 10px 24px #0008);animation:floaty 4s ease-in-out infinite}
.ring{position:absolute;inset:0;border-radius:50%;border:2px dashed #f5d21f55;animation:spin 30s linear infinite}
.ring:after{content:"";position:absolute;top:-6px;left:50%;width:12px;height:12px;border-radius:50%;background:var(--amber);box-shadow:0 0 12px var(--amber)}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.welcome-small{font-size:1rem;color:var(--amber);font-weight:600}
.welcome-title{font-size:clamp(2.4rem,10vw,3.6rem);font-weight:700;line-height:1.3;margin:4px 0 8px}
.welcome-title span{color:var(--amber)}
.welcome-sub{color:#fff;max-width:340px;font-size:1.3rem;font-weight:600}
.enter{margin-top:40px;display:flex;flex-direction:column;align-items:center;gap:10px;color:#fff;font-weight:600}
.enter .arrow{width:64px;height:64px;border-radius:50%;background:var(--green);display:grid;place-items:center;animation:pulse 2s infinite,bob 2s ease-in-out infinite}
.enter svg{width:28px;height:28px}
@keyframes pulse{0%{box-shadow:0 0 0 0 #16a34a99}70%{box-shadow:0 0 0 22px #16a34a00}100%{box-shadow:0 0 0 0 #16a34a00}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(8px)}}
.welcome-foot{position:absolute;bottom:18px;left:0;right:0;font-size:.95rem;color:#c5d2ea;padding:0 16px}

/* Header */
.top{position:sticky;top:0;z-index:10;background:var(--ink);color:#fff;padding:12px 16px;display:flex;align-items:center;gap:12px;box-shadow:0 2px 12px #0002}
.top .logo{width:52px;height:auto;flex:none}
.top .logo.mini{width:42px;margin-left:auto}
.top h1{font-size:1.2rem;font-weight:700;line-height:1.3}
.top small{display:block;color:#c5d2ea;font-size:.88rem;font-weight:500}
.back{width:42px;height:42px;border-radius:12px;background:#ffffff1a;display:grid;place-items:center;flex:none}
.back svg{width:22px;height:22px}
.wrap{max-width:960px;margin:0 auto;padding:22px 16px 40px}

/* Classes */
.hero-strip{background:linear-gradient(135deg,var(--ink2),var(--ink));color:#fff;border-radius:var(--r);padding:22px;margin-bottom:22px;position:relative;overflow:hidden}
.hero-strip h2{font-size:1.35rem;font-weight:700}
.hero-strip p{color:#e3eaf7;font-size:1rem}
.hero-strip:after{content:"";position:absolute;right:-30px;top:-30px;width:130px;height:130px;border-radius:50%;border:2px dashed #ffffff2a}
.section-label{font-weight:700;font-size:1.1rem;margin:4px 2px 12px;display:flex;align-items:center;gap:8px}
.section-label:before{content:"";width:6px;height:20px;border-radius:3px;background:var(--red)}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(min-width:680px){.grid{grid-template-columns:repeat(4,1fr)}}
.class-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 14px;text-align:left;position:relative;overflow:hidden;transition:transform .15s,box-shadow .15s;min-height:120px;display:flex;flex-direction:column;justify-content:space-between}
.class-card:active{transform:scale(.97)}
@media(hover:hover){.class-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #0b1b3314}}
.class-card .num{font-size:2.3rem;font-weight:700;line-height:1.2;color:var(--c);word-break:break-word}
.class-card .num.txt{font-size:1.3rem;line-height:1.3}
.class-card .lbl{font-size:1rem;font-weight:600;color:var(--muted);margin-top:6px;display:flex;justify-content:space-between;align-items:center;gap:6px}
.class-card .lbl svg{width:18px;height:18px;color:var(--c);flex:none}
.class-card:before{content:"";position:absolute;right:-18px;top:-18px;width:70px;height:70px;border-radius:50%;background:var(--c);opacity:.1}
.class-card.wide{grid-column:span 2}

/* Class page */
.class-hero{border-radius:var(--r);padding:24px 22px;color:#fff;background:linear-gradient(135deg,var(--c),var(--c2));margin-bottom:22px}
.class-hero .big{font-size:2rem;font-weight:700;line-height:1.3}
.class-hero p{opacity:.95}
.opts{display:grid;gap:12px}
@media(min-width:680px){.opts{grid-template-columns:repeat(2,1fr)}}
.opt{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;align-items:center;gap:14px;text-align:left;transition:transform .15s}
.opt:active{transform:scale(.98)}
.opt .ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;flex:none;font-size:1.6rem}
.opt b{display:block;font-size:1.08rem}
.opt span{font-size:.95rem;color:var(--muted)}
.opt .chev{margin-left:auto;color:#a9b5c7;width:20px;height:20px;flex:none}

/* Album */
.album{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
@media(min-width:680px){.album{grid-template-columns:repeat(4,1fr)}}
.ph{aspect-ratio:1;border-radius:12px;overflow:hidden;background:linear-gradient(110deg,#e6ebf3 30%,#f3f6fa 50%,#e6ebf3 70%);background-size:200% 100%;animation:shimmer 1.4s linear infinite;position:relative;display:block;width:100%}
.ph.done{animation:none;background:#e6ebf3}
@keyframes shimmer{to{background-position:-200% 0}}
.ph img{width:100%;height:100%;object-fit:cover;display:block;opacity:0;transition:opacity .4s}
.ph img.loaded{opacity:1}
.ph .cap{position:absolute;left:0;right:0;bottom:0;padding:18px 8px 6px;font-size:.85rem;color:#fff;background:linear-gradient(transparent,#000a);text-align:left}
.empty{background:var(--card);border:1px dashed #c6cfdc;border-radius:var(--r);padding:34px 18px;text-align:center;color:var(--muted)}
.empty .em{font-size:2.4rem;margin-bottom:6px}
.lightbox{position:fixed;inset:0;background:#000e;z-index:50;display:none;align-items:center;justify-content:center;padding:16px}
.lightbox.open{display:flex}
.lightbox img{max-width:100%;max-height:82vh;border-radius:10px}
.lb-close{position:absolute;top:14px;right:14px;width:46px;height:46px;border-radius:50%;background:#ffffff22;color:#fff;font-size:1.7rem}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;background:#ffffff22;color:#fff;font-size:1.5rem}
.lb-prev{left:10px}.lb-next{right:10px}
.lb-cap{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:#eee;font-size:1rem;padding:0 20px}

/* Batch, days, subjects */
.batch{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;display:flex;gap:14px;align-items:center;margin-bottom:10px}
.batch .time{background:var(--c);color:#fff;border-radius:12px;padding:10px 12px;text-align:center;min-width:128px;font-weight:700;font-size:1.2rem;line-height:1.35}
.batch .time small{display:block;font-weight:600;font-size:.9rem}
.batch b{display:block;font-size:1.1rem}
.batch span{color:var(--muted);font-size:.95rem}
.days{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;margin-top:14px}
.days p{color:var(--muted);font-size:1.02rem;margin-top:8px}
.days p b{color:var(--red)}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;margin-top:10px}
.week span{text-align:center;font-size:.85rem;font-weight:700;padding:9px 0;border-radius:10px;background:color-mix(in srgb,var(--c) 14%,white);color:var(--c2)}
.week span.off{background:#fde2e3;color:var(--red);text-decoration:line-through}
.all-subj{background:linear-gradient(135deg,var(--c),var(--c2));color:#fff;border-radius:var(--r);padding:40px 20px;text-align:center}
.all-subj .em{font-size:3.2rem;margin-bottom:8px}
.all-subj p{font-size:1.9rem;font-weight:700;line-height:1.5;white-space:pre-line}

/* Files */
.files{display:grid;gap:10px}
.file{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;gap:12px;align-items:center;text-decoration:none}
.file .fi{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:1.4rem;background:#eef2ff;flex:none}
.file b{display:block;font-size:1.02rem;line-height:1.35}
.file span{font-size:.88rem;color:var(--muted)}
.file .dl{margin-left:auto;color:var(--ink2);font-weight:700;font-size:.9rem;flex:none}
.notice-block{margin-top:26px}

/* Footer */
footer{background:var(--ink);color:#eef2fa;padding:26px 16px 30px;margin-top:10px}
footer .in{max-width:960px;margin:0 auto;display:grid;gap:12px}
footer h3{color:#fff;font-weight:700;font-size:1.3rem}
.ct{display:flex;gap:10px;align-items:flex-start}
.ct svg{width:20px;height:20px;flex:none;margin-top:3px;color:#4ade80}
.ct a{text-decoration:none}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}
.pill{display:inline-flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:700;padding:10px 18px;border-radius:999px;background:var(--green)}
.pill.wa{background:#25d366}.pill.fb{background:#1877f2}.pill.map{background:#ffffff22}
.credit{font-size:.8rem;color:#9fb0cf;margin-top:6px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}