/* Simple Learning Hub — mock test engine styles (uses the main site's CSS variables) */
#tx{margin:10px 0 40px}
.txtabs{display:flex;gap:6px;overflow-x:auto;margin:6px 0 14px;padding-bottom:2px}
.txtabs button{flex:0 0 auto;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:8px 14px;font-weight:600;cursor:pointer;font-size:.9rem}
.txtabs button[aria-selected=true]{background:var(--navy);color:#fff;border-color:var(--navy)}
.txex{margin:8px 0 22px}.txex h2{margin-bottom:2px}
.txm{display:flex;gap:12px;align-items:center;justify-content:space-between;margin:10px 0;flex-wrap:wrap}.txm h3{margin:0 0 4px}.txm p{margin:2px 0}
.txgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px;margin-bottom:18px}.txs h3{margin:0 0 4px;font-size:1rem}.txs p{margin:0 0 8px}
a.txs{text-decoration:none;color:var(--ink)}
.txtbl{border-collapse:collapse;width:100%;font-size:.9rem;margin:10px 0}.txtbl th,.txtbl td{border:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}.txtbl th{background:var(--soft)}
.txtw{overflow-x:auto}
.txleg{display:flex;flex-wrap:wrap;gap:8px 14px;font-size:.85rem;margin:8px 0}.txleg span{display:inline-flex;align-items:center;gap:6px}.txleg.sm{font-size:.76rem;gap:6px 10px}
.txagree{display:flex;gap:8px;align-items:flex-start;margin:14px 0 4px;font-size:.92rem}
/* palette buttons — NTA colours */
.pb{display:inline-flex;align-items:center;justify-content:center;min-width:30px;height:30px;padding:0 4px;font-style:normal;font-weight:700;font-size:.82rem;border:1px solid #b9c3cc;background:#fff;color:#333;border-radius:6px;cursor:pointer;position:relative}
.pb.na{background:#e53935;border-color:#c62828;color:#fff;border-radius:6px 6px 14px 14px}
.pb.an{background:#2e9e4f;border-color:#1f7a3a;color:#fff;border-radius:14px 14px 6px 6px}
.pb.mr{background:#6a3fb5;border-color:#55309a;color:#fff;border-radius:50%}
.pb.am{background:#6a3fb5;border-color:#55309a;color:#fff;border-radius:50%}
.pb.am::after{content:"";position:absolute;right:-3px;bottom:-3px;width:11px;height:11px;border-radius:50%;background:#2e9e4f;border:2px solid #fff}
.pb.cur{outline:3px solid var(--y);outline-offset:1px}
/* full-screen CBT */
html.txfull,html.txfull body{overflow:hidden}
html.txfull .bnav{display:none}
.txcbt{position:fixed;inset:0;z-index:60;background:var(--bg);display:flex;flex-direction:column}
.txbar{display:flex;align-items:center;gap:10px;background:var(--navy);color:#fff;padding:8px 12px}
.txtitle{flex:1;font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.txclock{font-family:Poppins,system-ui,sans-serif;font-weight:700;background:rgba(255,255,255,.12);padding:4px 10px;border-radius:8px;font-variant-numeric:tabular-nums}.txclock.low{background:#e53935}
.txbar .btn{margin:0;background:var(--y);color:#081c2c;border-color:var(--y)}
.txsec{display:flex;gap:4px;overflow-x:auto;background:var(--card);border-bottom:1px solid var(--line);padding:6px 8px}
.txsec button{flex:0 0 auto;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:8px;padding:6px 12px;font-weight:600;font-size:.85rem;cursor:pointer}
.txsec button[aria-selected=true]{background:#1565c0;border-color:#1565c0;color:#fff}
.txmain{flex:1;display:flex;min-height:0}
.txleft{flex:1;display:flex;flex-direction:column;min-width:0}
.txq{flex:1;overflow-y:auto;padding:12px 14px 18px;-webkit-overflow-scrolling:touch}
.txqh{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:6px;margin-bottom:10px}
.txmk{color:var(--ok);font-weight:600}
.txqt{font-size:1.02rem;line-height:1.6;overflow-x:auto}.txqt table.mt,.txexp table.mt{border-collapse:collapse;margin:8px 0}.mt td,.mt th{border:1px solid var(--line);padding:4px 8px;vertical-align:top}
.txopts{display:grid;gap:8px;margin-top:12px}
.txo{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--card);cursor:pointer;line-height:1.5}
.txo input{margin-top:5px;flex:0 0 auto;width:18px;height:18px;accent-color:#1565c0}.txo b{flex:0 0 auto}.txo>span{flex:1;min-width:0;overflow-x:auto;overflow-y:hidden}
.txo.on{border-color:#1565c0;background:rgba(21,101,192,.07)}
.txo.ok{border-color:var(--ok);background:var(--okbg)}.txo.bad{border-color:var(--bad);background:var(--badbg)}
.txnum{display:flex;flex-direction:column;gap:4px;margin:14px 0 6px;max-width:260px}.txnum input{font-size:1.2rem;padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}
.txkp{display:grid;grid-template-columns:repeat(3,56px);gap:6px}.txkp button{height:42px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font-size:1.05rem;font-weight:600;cursor:pointer}
.txact{display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:8px 10px;border-top:1px solid var(--line);background:var(--card)}
.txact .btn{margin:0}.txact .sp{flex:1}
.txpal{width:300px;flex:0 0 300px;border-left:1px solid var(--line);background:var(--card);overflow-y:auto;padding:10px 12px}
.txpalh{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}#txpx{display:none;font-size:1.2rem}
.txgridp{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:8px;margin-top:10px}.txgridp .pb{height:36px}
.txpalbtn{display:none}
@media (max-width:820px){
 .txpal{position:fixed;left:0;right:0;bottom:0;top:auto;width:auto;max-height:72vh;border-left:0;border-top:2px solid var(--line);border-radius:16px 16px 0 0;box-shadow:0 -8px 30px rgba(0,0,0,.25);transform:translateY(105%);transition:transform .2s;z-index:62}
 html.txpalopen .txpal{transform:none}#txpx{display:inline}
 .txsec{flex-wrap:wrap}.txsec .txpalbtn{display:inline-block;margin-left:auto;background:var(--navy);border-color:var(--navy);color:#fff}
 .txact{padding:8px}.txact .btn{font-size:.8rem;padding:8px 10px}
 #txmr{order:1}#txcl{order:2}.txact .sp{order:3;flex-basis:100%;height:0}#txbk{order:4}#txsn{order:5;flex:1;justify-content:center}
}
.txmodal{position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;padding:14px}.txmodal .card{max-width:560px;width:100%;max-height:90vh;overflow:auto}
/* result */
.txres{text-align:center}.txbig{font-family:Poppins,system-ui,sans-serif;font-size:3rem;font-weight:700;color:var(--hd);line-height:1.1}.txbig small{font-size:1.3rem;color:var(--mut)}
.txstats{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:12px 0}.txstats span{display:flex;flex-direction:column;min-width:84px;background:var(--soft);border-radius:12px;padding:8px 10px;font-size:.8rem}.txstats b{font-size:1.2rem;color:var(--hd)}.txstats .g b{color:var(--ok)}.txstats .r b{color:var(--bad)}
.txtime{display:flex;align-items:flex-end;gap:2px;height:64px;overflow-x:auto;padding:2px 0;border-bottom:1px solid var(--line)}.txtime a{flex:0 0 5px;min-width:5px;background:#b9c3cc;border-radius:2px 2px 0 0}.txtime a.c,.txtime a.p{background:#2e9e4f}.txtime a.w{background:#e53935}
.txfilt{display:flex;flex-wrap:wrap;gap:4px;margin:8px 0}.txfilt .chip{cursor:pointer;border:1px solid var(--line);font-size:.85rem;padding:6px 12px}.txfilt .chip.on{background:var(--navy);color:#fff}
.txsols{display:grid;gap:12px}.txsol{border-left:5px solid #b9c3cc}.txsol.c,.txsol.p{border-left-color:#2e9e4f}.txsol.w{border-left-color:#e53935}
.txol{list-style:none;padding:0;margin:8px 0}.txol li{padding:5px 8px;border-radius:8px;margin:3px 0}.txol li.k{background:var(--okbg);color:var(--ok);font-weight:600}.txol li.x{background:var(--badbg);color:var(--bad)}
.txexp{font-size:.95rem;line-height:1.6;margin-top:6px;overflow-x:auto}
details summary{cursor:pointer;font-weight:600;color:var(--link)}
.note.ok{border-color:var(--ok);background:var(--okbg)}.note.bad{border-color:var(--bad);background:var(--badbg)}
.txprog{height:6px;background:var(--soft);border-radius:4px;margin:4px 0 12px;overflow:hidden}.txprog i{display:block;height:100%;background:var(--g)}
/* revision */
.txnotes,.txform{display:grid;gap:8px}.txn,.txf{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px}.txn p{margin:4px 0 0}.txfm{margin:6px 0;overflow-x:auto;font-size:1.05rem}
.txflash{margin:12px 0 18px;text-align:center}
.txcard{display:grid;width:100%;max-width:520px;min-height:170px;margin:6px auto;border:2px solid var(--line);border-radius:18px;background:linear-gradient(135deg,var(--card),var(--soft));color:var(--ink);font-size:1.05rem;line-height:1.5;padding:18px;cursor:pointer;text-align:center;align-items:center}
.txcard .fr,.txcard .bk{grid-area:1/1;transition:opacity .25s}.txcard .bk{opacity:0}.txcard.fl .fr{opacity:0}.txcard.fl .bk{opacity:1}.txcard.fl{border-color:var(--g)}
.txcard .fr{font-weight:600}

.txsol p b,.txsol li b,.txol b,.txsol .small b{display:inline;font-size:inherit;margin:0;color:inherit}
/* premium v1 (2026-11-01): intro table fits a 390px phone; softer chrome */
.card .txtbl{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;font-size:.84rem;border-radius:10px}.txtbl th{white-space:nowrap}.txtabs button{transition:background .2s,color .2s,border-color .2s}.txtabs button[aria-selected=true]{background:linear-gradient(180deg,#0e3446,var(--navy));box-shadow:0 6px 14px -8px rgba(7,26,38,.8)}