/* JEEmulation: shared look for every chapter lab (loaded after ../site.css) */
.wrap { max-width:1240px; }
.jee-badge { font-size:11px; font-weight:800; letter-spacing:.12em; color:#021018; background:linear-gradient(90deg,#ffd166,#ff8a4c); border-radius:6px; padding:3px 7px; margin-left:6px; vertical-align:middle; }
.crumbs { font-size:13px; color:var(--dim); margin:18px 0 4px; } .crumbs a { color:var(--dim); }
h1.ch { font-size:clamp(26px,3.6vw,38px); margin:0 0 4px; } h1.ch small { display:block; font-size:14px; color:var(--accent); letter-spacing:.08em; text-transform:uppercase; font-weight:700; }
.lab { display:grid; grid-template-columns:250px 1fr 290px; gap:14px; align-items:start; margin-top:14px; }
@media (max-width:1100px) { .lab { grid-template-columns:220px 1fr; } .lab .side { grid-column:1 / -1; } }
@media (max-width:760px) { .lab { grid-template-columns:1fr; } }
.topics { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:8px; position:sticky; top:70px; max-height:calc(100vh - 90px); overflow:auto; }
@media (max-width:760px) { .topics { position:static; max-height:none; display:flex; overflow-x:auto; gap:4px; } }
.topics button { display:flex; gap:8px; align-items:flex-start; width:100%; text-align:left; font:inherit; font-size:14px; color:var(--dim); background:transparent; border:0; border-radius:9px; padding:8px 10px; cursor:pointer; line-height:1.35; }
@media (max-width:760px) { .topics button { width:auto; white-space:nowrap; } }
.topics button:hover { color:var(--fg); background:#0c102880; } .topics button.on { color:var(--fg); background:#13204a; box-shadow:inset 3px 0 0 var(--accent); }
.topics button i { font-style:normal; font-size:12px; color:var(--ok); min-width:12px; }
.stage { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:12px; min-width:0; }
.stage h2 { font-size:20px; margin:2px 4px 10px; }
#cv { width:100%; aspect-ratio:900/520; display:block; background:#03050c; border-radius:10px; touch-action:none; }
.bar { display:flex; gap:8px; flex-wrap:wrap; align-items:center; margin-top:10px; } .bar .btn { font-size:13px; padding:6px 12px; }
.bar .spacer { flex:1; }
.side { display:flex; flex-direction:column; gap:12px; }
.box { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:12px 14px; }
.box h3 { margin:0 0 8px; font-size:12px; letter-spacing:.1em; text-transform:uppercase; color:var(--dim); }
.ctl label { display:flex; justify-content:space-between; font-size:13px; color:var(--dim); margin:10px 0 3px; } .ctl label b { color:var(--fg); font-variant-numeric:tabular-nums; }
.ctl label:first-of-type { margin-top:0; }
.ctl input[type=range] { width:100%; }
.ctl .seg { display:flex; flex-wrap:wrap; gap:4px; margin:6px 0; } .ctl .seg button { font:inherit; font-size:12px; font-weight:600; color:var(--dim); background:#070a1a; border:1px solid var(--line); border-radius:99px; padding:4px 10px; cursor:pointer; }
.ctl .seg button.on { background:var(--accent); color:#021018; border-color:var(--accent); }
.ctl .chk { display:flex; gap:6px; align-items:center; font-size:13px; color:var(--fg); margin:6px 0; cursor:pointer; justify-content:flex-start; }
.read { display:grid; grid-template-columns:1fr 1fr; gap:6px; } .read div { background:#070a1a; border:1px solid var(--line); border-radius:8px; padding:6px 9px; }
.read small { display:block; font-size:11px; color:var(--dim); } .read b { font-size:15px; font-variant-numeric:tabular-nums; }
.read div.wide { grid-column:1 / -1; }
.formula { font-family:"Times New Roman",serif; font-size:17px; line-height:1.8; color:#e8ecff; } .formula div { padding:1px 0; }
.prob { font-size:14px; line-height:1.6; color:#d5daf0; } .prob details { margin-top:6px; } .prob summary { cursor:pointer; color:var(--accent); font-weight:600; }
.tip { font-size:14px; line-height:1.55; color:#ffe2a8; background:#2a220a40; border-left:3px solid #ffd166; border-radius:0 8px 8px 0; padding:8px 10px; }
.idea { font-size:15px; line-height:1.6; color:#c5cbe6; margin:10px 4px 0; }
.done-btn.on { background:#0b2a1a; border-color:var(--ok); color:var(--ok); }
/* subject hub */
.subjects { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:16px; margin:20px 0 40px; }
.subj { position:relative; display:flex; flex-direction:column; gap:8px; min-height:260px; padding:24px; border-radius:20px; text-decoration:none; color:var(--fg);
        background:radial-gradient(circle at 85% 0%, color-mix(in srgb, var(--c) 28%, transparent), transparent 60%), var(--card); border:1px solid var(--line); transition:transform .15s, border-color .15s; }
.subj:hover { transform:translateY(-4px); border-color:var(--c); }
.subj .ic { font-size:46px; line-height:1; color:var(--c); } .subj h2 { margin:6px 0 0; font-size:30px; } .subj p { color:#c5cbe6; margin:0; line-height:1.5; font-size:15px; }
.subj .meta { margin-top:auto; font-size:12px; color:var(--dim); } .subj .prog { font-size:13px; font-weight:700; color:var(--ok); } .subj .go { font-weight:700; color:var(--c); }
/* landing page */
.hero-j { padding:30px 0 6px; } .hero-j h1 { font-size:clamp(32px,5vw,54px); margin:0; } .hero-j h1 span { background:linear-gradient(90deg,#ffd166,#ff8a4c); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero-j p { color:var(--dim); max-width:720px; font-size:16px; line-height:1.6; }
.jtools { display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin:14px 0 18px; }
.jtools input { font:inherit; font-size:15px; color:var(--fg); background:var(--card); border:1px solid var(--line); border-radius:10px; padding:10px 12px; min-width:min(360px,100%); }
.vol { margin:22px 0 10px; font-size:13px; letter-spacing:.12em; text-transform:uppercase; color:var(--dim); }
.chgrid { display:grid; grid-template-columns:repeat(auto-fill,minmax(270px,1fr)); gap:12px; }
.chcard { display:block; background:var(--card); border:1px solid var(--line); border-radius:14px; padding:14px 16px; color:var(--fg); text-decoration:none; position:relative; }
.chcard:hover { border-color:var(--accent); transform:translateY(-2px); } .chcard.soon { opacity:.55; pointer-events:none; }
.chcard .no { font-size:12px; font-weight:800; color:var(--accent); letter-spacing:.08em; } .chcard h2 { font-size:17px; margin:4px 0 6px; }
.chcard p { font-size:13px; color:var(--dim); margin:0; line-height:1.45; }
.chcard .prog { position:absolute; top:12px; right:14px; font-size:12px; color:var(--ok); font-weight:700; }
.chcard .tag-soon { position:absolute; top:12px; right:14px; font-size:11px; color:var(--dim); border:1px solid var(--line); border-radius:99px; padding:2px 8px; }