:root{--p:#4f46e5;--p2:#7c3aed;--pd:#312e81;--acc:#f97316;--ok:#16a34a;--bad:#dc2626;--bg:#f5f5fb;--card:#fff;--tx:#1c1a33;--mu:#6b6987;--bd:#e6e4f2;--sh:0 1px 2px rgba(30,20,80,.06),0 4px 14px rgba(30,20,80,.06);--r:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Devanagari","Nirmala UI",sans-serif;color:var(--tx);background:var(--bg);padding-bottom:72px}
a{color:var(--p)}img{max-width:100%}
[data-lang=hi] .le,[data-lang=en] .lh{display:none!important}
.sr{position:absolute;left:-9999px}.sr:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:99}
.top{position:sticky;top:0;z-index:20;background:linear-gradient(120deg,var(--pd),var(--p) 60%,var(--p2));color:#fff;box-shadow:0 2px 10px rgba(49,46,129,.25)}
.top .in{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:10px;padding:8px 12px}
.brand{display:flex;align-items:center;gap:9px;color:#fff;text-decoration:none;min-width:0;flex:1}
.brand b{font-size:18px;letter-spacing:.2px;display:block;line-height:1.15}.brand small{display:block;font-size:11.5px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topnav{display:none;gap:4px}.topnav a{color:#fff;text-decoration:none;padding:7px 10px;border-radius:9px;font-size:14.5px;opacity:.9}.topnav a[aria-current],.topnav a:hover{background:rgba(255,255,255,.16);opacity:1}
.lang{display:flex;background:rgba(255,255,255,.16);border-radius:10px;padding:3px}
.lang button{border:0;background:none;color:#fff;font:600 14px/1 inherit;padding:7px 10px;border-radius:8px;cursor:pointer;min-width:38px}
.lang button[aria-pressed=true]{background:#fff;color:var(--pd)}
main{max-width:1080px;margin:0 auto;padding:14px 12px 24px}
h1{font-size:22px;line-height:1.3;margin:6px 0 10px}h2{font-size:19px;margin:22px 0 10px}h3{font-size:17px;margin:16px 0 8px}
.mu{color:var(--mu)}.sm{font-size:14px}
.card{min-width:0;overflow-wrap:anywhere;background:var(--card);border:1px solid var(--bd);border-radius:var(--r);box-shadow:var(--sh);padding:14px}
.grid{display:grid;gap:10px;grid-template-columns:repeat(2,minmax(0,1fr))}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:12px;padding:12px 16px;font:600 15.5px/1.2 inherit;cursor:pointer;text-decoration:none;background:var(--p);color:#fff;min-height:46px}
.btn.alt{background:#eef0ff;color:var(--pd)}.btn.ghost{background:none;border:1.5px solid var(--bd);color:var(--tx)}.btn.acc{background:var(--acc)}.btn.ok{background:var(--ok)}.btn.bad{background:var(--bad)}
.btn.sm{min-height:36px;padding:8px 12px;font-size:14px;border-radius:10px}.btn.block{display:flex;width:100%}
.btn:disabled{opacity:.5;cursor:default}
.hero{background:linear-gradient(135deg,#1e1b4b,#4338ca 55%,#7c3aed);color:#fff;border-radius:18px;padding:18px 16px;position:relative;overflow:hidden}
.hero h1{margin:0 0 6px;font-size:23px}.hero p{margin:0;opacity:.92}
.hero:after{content:"";position:absolute;right:-40px;top:-40px;width:160px;height:160px;border-radius:50%;background:rgba(255,255,255,.08)}
.hstats{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}.hstats span{background:rgba(255,255,255,.14);border-radius:10px;padding:6px 10px;font-size:13.5px}.hstats b{font-size:16px}
.strip{margin:12px 0;background:#fff7ed;border:1px solid #fed7aa;border-radius:14px;overflow:hidden}
.strip .sh{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;background:#ffedd5;font-weight:700;color:#9a3412;font-size:15px}
.strip .sh a{font-weight:600;font-size:13px;color:#9a3412}
.strip ul{list-style:none;margin:0;padding:0;max-height:260px;overflow:auto}
.strip li{border-top:1px solid #fde3c8}.strip li:first-child{border-top:0}
.strip li a{display:block;padding:10px 12px;color:var(--tx);text-decoration:none;font-size:14.5px;line-height:1.45}
.strip .tg{display:inline-block;font-size:12px;font-weight:700;border-radius:6px;padding:1px 7px;margin-right:6px;background:#fee2e2;color:#991b1b}
.strip .ex{display:inline-block;font-size:12px;font-weight:800;border-radius:6px;padding:1px 7px;margin-right:6px;background:#e0e7ff;color:#3730a3}
.strip.oth{background:#f5f7ff;border-color:#c7d2fe}.strip.oth .sh{background:#e0e7ff;color:#312e81}.strip.oth .sh a{color:#312e81}.strip.oth li{border-top-color:#e0e7ff}
.strip .tg.g{background:#dcfce7;color:#166534}.strip .dt{display:block;font-size:12.5px;color:var(--mu);margin-top:2px}
.feat{border:2px solid var(--acc);background:linear-gradient(180deg,#fff,#fff7ed)}
.feat .k{display:inline-block;background:var(--acc);color:#fff;font-size:12px;font-weight:700;border-radius:999px;padding:2px 10px}
.feat h2{margin:8px 0 4px;font-size:19px}.cd{font-size:15px;font-weight:700;color:#b45309;margin:6px 0 10px}
.qa{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0}
.qa a{display:flex;flex-direction:column;gap:4px;background:#fff;border:1px solid var(--bd);border-radius:14px;padding:12px;text-decoration:none;color:var(--tx);box-shadow:var(--sh)}
.qa a .e{font-size:24px}.qa a b{font-size:15.5px}.qa a span{font-size:12.5px;color:var(--mu)}
.subj{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--bd);border-radius:14px;padding:12px;text-decoration:none;color:var(--tx);box-shadow:var(--sh)}
.subj .e{font-size:26px;width:44px;height:44px;display:grid;place-items:center;background:#eef0ff;border-radius:12px;flex:none}
.subj .t{flex:1;min-width:0}.subj b{display:block;font-size:15.5px}.subj small{color:var(--mu);font-size:12.5px}
.bar{height:6px;background:#ecebf5;border-radius:9px;overflow:hidden;margin-top:6px}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--ok),#22c55e);width:0}
.list{display:grid;gap:10px}
.topic{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid var(--bd);border-radius:14px;padding:12px;color:var(--tx);text-decoration:none}
.topic .n{width:30px;height:30px;border-radius:9px;background:#eef0ff;color:var(--pd);font-weight:700;display:grid;place-items:center;flex:none;font-size:14px}
.topic .t{flex:1;min-width:0}.topic b{display:block;font-size:15.5px;line-height:1.35}.topic small{color:var(--mu);font-size:12.5px}
.chips{display:flex;gap:8px;overflow:auto;padding:2px 0 8px;scrollbar-width:none}.chips::-webkit-scrollbar{display:none}
.chip{flex:none;border:1px solid var(--bd);background:#fff;border-radius:999px;padding:7px 13px;font:600 14px inherit;color:var(--tx);cursor:pointer;text-decoration:none}
.chip[aria-pressed=true]{background:var(--p);border-color:var(--p);color:#fff}
.crumb{font-size:13.5px;color:var(--mu);margin:2px 0 6px}.crumb a{color:var(--mu)}
.notes{background:#fff;border:1px solid var(--bd);border-radius:var(--r);padding:6px 16px 14px;font-size:16.5px;line-height:1.7}
.notes h2{font-size:19px;color:var(--pd);border-bottom:2px solid #eef0ff;padding-bottom:4px}.notes h3{font-size:17px;color:#3730a3}
.notes ul,.notes ol{padding-left:22px;margin:8px 0}.notes li{margin:4px 0}
.notes .tip{background:#fffbeb;border-left:4px solid #f59e0b;border-radius:8px;padding:10px 12px;margin:12px 0;font-size:15.5px}
.tw{overflow-x:auto;margin:10px 0;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:14.5px;background:#fff}th,td{border:1px solid var(--bd);padding:7px 9px;text-align:left;vertical-align:top}th{background:#f1f0fb;font-weight:700}
.yt{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;border-radius:12px;overflow:hidden;background:#111 center/cover no-repeat;cursor:pointer}
.yt:before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0) 50%,rgba(0,0,0,.55))}
.yt i{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:62px;height:44px;border-radius:12px;background:#e11d48;display:grid;place-items:center}
.yt i:after{content:"";border-left:17px solid #fff;border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:4px}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lec{background:#fff;border:1px solid var(--bd);border-radius:14px;padding:8px;box-shadow:var(--sh)}
.lec b{display:block;font-size:14.5px;line-height:1.35;margin:8px 4px 2px}.lec small{display:block;color:var(--mu);font-size:12.5px;margin:0 4px 4px}
.lgrid{display:grid;gap:12px;grid-template-columns:1fr}
/* quiz */
.qhead{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px;font-size:14px;color:var(--mu)}
.qcard{background:#fff;border:1px solid var(--bd);border-radius:16px;padding:16px;box-shadow:var(--sh)}
.qtext{font-size:17.5px;line-height:1.6;font-weight:600;margin-bottom:14px;white-space:pre-line}
.opts{display:grid;gap:10px}
.opt{display:flex;gap:10px;align-items:center;width:100%;text-align:left;border:1.5px solid var(--bd);background:#fff;border-radius:12px;padding:12px;font:16px/1.45 inherit;color:var(--tx);cursor:pointer;min-height:50px}
.opt .l{flex:none;width:28px;height:28px;border-radius:50%;background:#f1f0fb;display:grid;place-items:center;font-weight:700;font-size:14px}
.opt[aria-pressed=true]{border-color:var(--p);background:#eef0ff}.opt[aria-pressed=true] .l{background:var(--p);color:#fff}
.opt.right{border-color:var(--ok);background:#ecfdf3}.opt.right .l{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:#fef2f2}.opt.wrong .l{background:var(--bad);color:#fff}
.exp{margin-top:12px;border-radius:12px;padding:12px;background:#f8fafc;border:1px solid var(--bd);font-size:15px}
.exp.ok{background:#ecfdf3;border-color:#bbf7d0}.exp.no{background:#fef2f2;border-color:#fecaca}
.qnav{display:flex;gap:8px;margin-top:14px}.qnav .btn{flex:1}
.prog{height:6px;background:#e6e4f2;border-radius:9px;overflow:hidden;margin-bottom:10px}.prog i{display:block;height:100%;background:var(--p);transition:width .2s}
.score{text-align:center;padding:20px 14px}.score .big{font-size:44px;font-weight:800;color:var(--pd);line-height:1.1}
.kv{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:14px 0}.kv div{background:#f8f8fd;border-radius:12px;padding:10px 6px;text-align:center}.kv b{display:block;font-size:20px}.kv span{font-size:12.5px;color:var(--mu)}
/* mock */
.mbar{position:sticky;top:56px;z-index:10;background:#fff;border:1px solid var(--bd);border-radius:12px;padding:8px 10px;display:flex;align-items:center;gap:8px;margin-bottom:10px;box-shadow:var(--sh)}
.timer{font:700 18px/1 ui-monospace,monospace;color:var(--pd);background:#eef0ff;padding:8px 10px;border-radius:9px}.timer.low{color:#fff;background:var(--bad)}
.pal{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}
.pal button{height:40px;border-radius:9px;border:1.5px solid var(--bd);background:#fff;font:600 14px inherit;cursor:pointer}
.pal .a{background:var(--ok);border-color:var(--ok);color:#fff}.pal .r{background:#a855f7;border-color:#a855f7;color:#fff}.pal .c{outline:3px solid var(--acc)}
.sheet{position:fixed;inset:0;background:rgba(15,10,40,.45);z-index:50;display:flex;align-items:flex-end}
.sheet>div{background:#fff;width:100%;max-height:80vh;overflow:auto;border-radius:18px 18px 0 0;padding:16px}
.legend{display:flex;gap:12px;flex-wrap:wrap;font-size:12.5px;color:var(--mu);margin:8px 0}.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:4px;vertical-align:-1px}
.foot{max-width:1080px;margin:10px auto 0;padding:16px 12px 24px;color:var(--mu);font-size:13.5px;border-top:1px solid var(--bd)}
.foot .fl{display:flex;flex-wrap:wrap;gap:6px 14px;margin-top:8px}.foot a{color:var(--mu)}
.bnav{position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--bd);display:grid;grid-template-columns:repeat(5,1fr);padding-bottom:env(safe-area-inset-bottom)}
.bnav a{display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 2px 6px;font-size:11.5px;color:var(--mu);text-decoration:none}
.bnav a[aria-current]{color:var(--p);font-weight:700}.bnav svg{width:22px;height:22px}
.badge{display:inline-block;font-size:11.5px;font-weight:700;border-radius:6px;padding:1px 7px;background:#eef0ff;color:var(--pd)}
.badge.v{background:#dcfce7;color:#166534}.badge.u{background:#fef9c3;color:#854d0e}
.empty{padding:24px;text-align:center;color:var(--mu)}
.skel{height:64px;border-radius:14px;background:linear-gradient(90deg,#eceaf6,#f6f5fb,#eceaf6);background-size:200% 100%;animation:sk 1.2s infinite}@keyframes sk{to{background-position:-200% 0}}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.sp{flex:1}
.hidden{display:none!important}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:#1c1a33;color:#fff;padding:10px 16px;border-radius:12px;z-index:90;font-size:14.5px;max-width:90vw}
input,select,textarea{font:16px/1.4 inherit;border:1.5px solid var(--bd);border-radius:10px;padding:10px;width:100%;background:#fff;color:var(--tx)}
textarea{min-height:90px;resize:vertical}label{display:block;font-weight:600;font-size:14px;margin:10px 0 4px}
@media(min-width:720px){.topnav{display:flex}.bnav{display:none}body{padding-bottom:0}.grid{grid-template-columns:repeat(3,minmax(0,1fr))}.qa{grid-template-columns:repeat(5,minmax(0,1fr))}.lgrid{grid-template-columns:repeat(3,minmax(0,1fr))}h1{font-size:26px}.mbar{top:62px}}
@media print{.top,.bnav,.foot,.strip{display:none}body{background:#fff}}

#admin .card .row{flex-wrap:wrap}#admin .card small{display:block}