:root{--bg:#f6f7fb;--card:#fff;--ink:#14213d;--mute:#5b6478;--line:#e2e6ef;--pri:#1e3a8a;--pri2:#2b4fb8;--acc:#f59e0b;--ok:#0f7a4a;--okbg:#e5f6ee;--r:12px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Devanagari",sans-serif}
a{color:var(--pri2)}
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.crumbs a{color:var(--mute)}
h1{font-size:1.55rem;line-height:1.25;margin:.3em 0 .4em}
h2{font-size:1.2rem;margin:1.4em 0 .5em}
h3{font-size:1.05rem}
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.small{font-size:.85rem;color:var(--mute)}
.hero{background:linear-gradient(135deg,#1e3a8a,#2b4fb8);color:#fff;border-radius:16px;padding:22px 18px;margin:6px 0 8px}
.hero h1{margin-top:0;font-size:1.6rem}
.hero p{margin:.4em 0;color:#e6ecff}
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.list a:hover{background:#f1f4fb}
.ln{display:block;font-weight:650;overflow-wrap:anywhere}
.ll{display:block;font-size:.85rem;color:var(--mute)}
.chap a{justify-content:flex-start}
.chap .ln{flex:1}
.cn{flex:0 0 28px;height:28px;border-radius:8px;background:#eef1fa;color:var(--pri);display:grid;place-items:center;font-weight:800;font-size:.85rem}
.pill{flex:0 0 auto;font-size:.75rem;padding:3px 9px;border-radius:999px;background:#eef0f4;color:var(--mute);white-space:nowrap}
.pill.ok{background:var(--okbg);color:var(--ok);font-weight:700}
.books{margin:12px 0;padding:12px;background:#fff8e8;border:1px solid #f6dfa6;border-radius:var(--r)}
.bh{margin:0 0 6px;font-weight:700}
.book{display:block;padding:8px 0;font-weight:600}
.book+.book{border-top:1px dashed #efd9a0}
.callout{background:#eef3ff;border-left:4px solid var(--pri2);padding:10px 12px;border-radius:8px;margin:12px 0}
.empty{background:var(--card);border:1px dashed #c9cfdc;border-radius:var(--r);padding:14px;margin:12px 0}
.empty p{margin:.3em 0}
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.toc a{flex:0 0 auto;font-size:.82rem;padding:6px 10px;border-radius:999px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--pri);white-space:nowrap}
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.notes h2{font-size:1.12rem;color:var(--pri);border-bottom:2px solid #eef1fa;padding-bottom:4px;scroll-margin-top:70px}
.notes h3.q{font-size:1rem;margin:1.1em 0 .3em;color:var(--ink)}
.notes ul,.notes ol{padding-left:1.25em}
.notes li{margin:.25em 0}
.notes li.sub{margin-left:1em;list-style:circle}
.notes code{background:#f1f3f8;padding:1px 5px;border-radius:5px;font-size:.92em}
.tw{overflow-x:auto;margin:10px 0}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{border:1px solid var(--line);padding:7px 8px;text-align:left;vertical-align:top}
th{background:#f3f5fa}
.pn{display:flex;justify-content:space-between;gap:10px;margin:16px 0 6px}
.pn a{flex:1;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px;text-decoration:none;font-weight:600;font-size:.92rem}
.pn .nx{text-align:right}
.share{font-size:.92rem}
.how ol{padding-left:1.2em}
.results .rs{font-size:.82rem;color:var(--mute);display:block}
.foot{background:#e9ecf4;color:#3b4459;font-size:.92rem;padding:18px 0 26px;margin-top:24px}
.foot p{margin:.4em 0}
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.chapter{margin-top:22px}
.js .chapter[hidden],[hidden]{display:none!important}
h2.ch{font-size:1.45rem;margin:.2em 0 .5em;color:var(--ink)}
.notes h3.sec{font-size:1.1rem;color:var(--pri);border-bottom:2px solid #eef1fa;padding-bottom:4px;margin:1.2em 0 .5em;scroll-margin-top:70px}
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details.en summary{cursor:pointer;font-weight:700;color:var(--pri2)}
.chap .ll{font-weight:400}
@media(max-width:380px){.brand span:last-child{display:none}}
section.chapter{scroll-margin-top:64px}
.medium{border:1px solid rgba(255,255,255,.35)}
.medium .sep{display:none}
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.sems .sl{font-size:.85rem;color:var(--muted);margin-right:4px;width:100%}
.sems a{flex:1 0 28%;text-align:center;padding:9px 6px;border:1px solid var(--line);border-radius:10px;background:#fff;text-decoration:none;font-weight:700;color:var(--pri)}
.sems a.yr{border-color:var(--pri2)}
.sems a[aria-current]{background:var(--pri);color:#fff;border-color:var(--pri)}
.grp2{font-weight:700;margin:10px 0 4px}
.brand .bt{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand .b1{font-size:.92rem;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand .b2{font-size:.7rem;font-weight:600;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand{min-width:0;flex:1 1 auto}
.brand .logo{font-size:.75rem}
.hero .lead{font-weight:600}
@media(max-width:380px){.brand span:last-child{display:flex}.brand .b1{font-size:.82rem}.medium a{padding:5px 8px;font-size:.8rem}}
@media(max-width:480px){.brand .logo{width:28px;height:28px}.brand .b1{white-space:normal;font-size:.8rem;line-height:1.15}.brand .b2{white-space:normal;font-size:.66rem}.topin{gap:6px}.topsearch{padding:6px 8px}}

.cform input,.cform textarea{width:100%;max-width:560px;box-sizing:border-box;font:inherit;font-size:1rem;padding:11px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink)}
.cform label{font-weight:600}
.cform button{font-size:1rem;font-weight:700;padding:12px 22px;border:0;border-radius:10px;background:var(--acc);color:#1b1300;cursor:pointer}
.footnav{margin:.7em 0;line-height:2.1}
.footnav a{white-space:nowrap}

.topnav{background:#16306f;position:sticky;top:56px;z-index:4}
.topnav .wrap{display:flex;gap:6px;overflow-x:auto;white-space:nowrap;padding:6px 12px;scrollbar-width:none}
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.topnav a{color:#e6ecff;text-decoration:none;font-size:.86rem;font-weight:600;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.1)}
.topnav a:hover{background:rgba(255,255,255,.22)}
.topiclist li{margin:.7em 0}
.pn{display:flex;justify-content:space-between;gap:10px;margin:14px 0;flex-wrap:wrap}
.pn a{font-weight:600}

.hpl .prow{display:flex;align-items:center;justify-content:space-between;gap:8px 12px;padding:11px 14px;flex-wrap:wrap}
.hpl .prow>span:first-child{flex:1 1 210px;min-width:0}
.hpl .pills{display:flex;flex-wrap:wrap;gap:6px;justify-content:flex-end}
.list.hpl a.pill{display:inline-block;min-height:0;padding:7px 11px;font-size:.78rem;text-decoration:none;color:var(--ok)}
.list.hpl a.pill:hover{filter:brightness(.95);background:var(--okbg)}

.medsw{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin:14px 0}
.medbtn{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border-radius:var(--r);background:var(--card);border:2px solid var(--pri2);text-decoration:none;color:var(--ink)}
.medbtn strong{font-size:1.1rem;color:var(--pri)}
.medbtn span{font-size:.85rem;color:var(--mute)}
.medbtn .mc{color:var(--pri2);font-weight:700}
h2.medh{margin-top:30px;padding:10px 14px;background:var(--pri);color:#fff;border-radius:var(--r)}
h2.medh .small{color:#dbe4ff}
h2[id],h3[id]{scroll-margin-top:118px}

/* Board question papers picker (Oct 26 2026) */
.pq-pick{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 14px 10px;margin:12px 0 16px;box-shadow:0 1px 3px rgba(20,33,61,.06)}
.pq-step{font-weight:700;color:var(--pri);margin:10px 0 6px;display:flex;align-items:center;gap:6px;font-size:1.02rem}
.pq-step:first-child{margin-top:0}
.pq-n{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--pri);color:#fff;font-size:.9rem;flex:none}
.pq-arr{color:var(--mute)}
.pq-opts{display:flex;flex-wrap:wrap;gap:8px}
.pq-o{display:flex;flex-direction:column;justify-content:center;min-height:48px;padding:8px 14px;border:2px solid var(--pri2);border-radius:10px;background:#fff;color:var(--pri);font-weight:700;text-decoration:none;line-height:1.2;flex:1 1 140px;text-align:center}
.pq-o small{font-weight:500;color:var(--mute);font-size:.8rem;margin-top:2px}
.pq-o.on,.pq-o[aria-current]{background:var(--pri);color:#fff;border-color:var(--pri)}
.pq-o.on small,.pq-o[aria-current] small{color:#dbe4ff}
.pq-o:focus-visible,.pq-b:focus-visible,.pq-years a:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
.pq-hint{margin:4px 0 8px;color:var(--mute);font-size:.92rem}
.pq-search{display:flex;align-items:center;gap:8px;border:2px solid var(--line);border-radius:10px;padding:4px 10px;background:#fff}
.pq-search input{flex:1;min-width:0;border:0;outline:0;font-size:1rem;padding:10px 0;background:transparent}
.pq-search:focus-within{border-color:var(--pri2)}
.pq-none{margin:8px 0 0;color:#9a3412;font-weight:600}
.pq-sec{margin:18px 0 8px}
.pq-sec h2{margin-bottom:8px}
.pq-years{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:0 0 10px}
.pq-years .sl{font-weight:700;color:var(--mute);margin-right:4px;font-size:.9rem}
.pq-years a{display:inline-flex;align-items:center;min-height:40px;padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--pri);font-weight:700;text-decoration:none}
.pq-years a.on{background:var(--acc);border-color:var(--acc);color:#1f1300}
.pq-year h3{margin:14px 0 6px;font-size:1.15rem;color:var(--ink);border-bottom:2px solid var(--line);padding-bottom:4px}
.pq-year h3 small{font-weight:500;color:var(--mute);font-size:.8rem}
.pq-list{list-style:none;margin:0;padding:0}
.pq-row{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:9px 0;border-bottom:1px solid var(--line)}
.pq-sub{flex:1 1 210px;font-weight:600;min-width:0;overflow-wrap:anywhere}
.pq-src{display:block;font-weight:400;color:var(--mute);font-size:.75rem;margin-top:1px}
.pq-btns{display:flex;flex-wrap:wrap;gap:6px}
.pq-b{display:inline-flex;flex-direction:column;justify-content:center;min-height:46px;padding:6px 12px;border-radius:10px;text-decoration:none;font-weight:700;line-height:1.15;border:1px solid transparent}
.pq-b small{font-weight:500;font-size:.72rem;opacity:.85}
.pq-b.pm{background:var(--okbg);color:var(--ok);border-color:#b7e4cd}
.pq-b.ps{background:#fff4e0;color:#8a4b00;border-color:#f6d49a}
.pq-top{margin:8px 0 0;font-size:.9rem}
.pq-hub{display:grid;gap:14px;margin:14px 0}
@media(min-width:760px){.pq-hub{grid-template-columns:1fr 1fr}}
.pq-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px}
.pq-big{display:flex;flex-direction:column;gap:3px;padding:14px;border-radius:10px;background:var(--pri);color:#fff;text-decoration:none;margin-bottom:10px}
.pq-big strong{font-size:1.15rem}.pq-big span{color:#dbe4ff;font-size:.92rem}.pq-big .mc{color:#fff;font-weight:700}
.pq-how{padding-left:1.3em}.pq-how li{margin:4px 0}
.pq-homecard{background:#fff8e6;border:2px solid var(--acc);border-radius:var(--r);padding:12px 14px;margin:14px 0}
.pq-homecard h2{margin:0 0 10px;font-size:1.15rem}
[hidden]{display:none!important}

/* Daily Revision MCQ */
.mcq{list-style:none;padding:0;margin:12px 0;counter-reset:mq}
.mq{counter-increment:mq;background:#fff;border:1px solid #dde3f0;border-radius:var(--r);padding:12px;margin:0 0 14px}
.mq-q{font-weight:700;font-size:1.05rem;margin:0 0 4px;line-height:1.45}
.mq-q::before{content:counter(mq) ". ";color:var(--pri2)}
.mq-ch{font-size:.8rem;color:var(--mute);margin:0 0 8px}
.mq-o{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.mq-b{display:flex;align-items:flex-start;gap:10px;width:100%;min-height:48px;padding:10px 12px;border:2px solid #cfd8ee;border-radius:10px;background:#f8faff;color:inherit;font:inherit;font-size:1rem;text-align:left;cursor:pointer;line-height:1.35}
.mq-b:hover{border-color:var(--pri2)}
.mq-b:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
.mq-l{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:#e3e9f8;color:var(--pri);font-weight:700;font-size:.85rem}
.mq-b.ok{border-color:#16a34a;background:#e8f8ee}
.mq-b.ok .mq-l{background:#16a34a;color:#fff}
.mq-b.bad{border-color:#dc2626;background:#fdecec}
.mq-b.bad .mq-l{background:#dc2626;color:#fff}
.mq-b:disabled{cursor:default;opacity:1;color:inherit}
.mq-x{margin-top:8px}
.mq-x summary{display:inline-block;min-height:40px;padding:8px 14px;border-radius:10px;background:#fff8e6;border:2px solid var(--acc);font-weight:700;cursor:pointer;list-style:none}
.mq-x summary::-webkit-details-marker{display:none}
.mq-x p{margin:8px 0 0;padding:8px 10px;background:#f1f7ef;border-radius:8px;line-height:1.45}
.mq-score{position:sticky;bottom:0;background:var(--pri);color:#fff;border-radius:10px;padding:10px 14px;margin:12px 0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;font-weight:700;z-index:5}
.mq-score:empty{display:none}
.mq-score p{margin:0}
.mq-final{font-size:1.1rem}
.mq-reset{min-height:44px;padding:8px 16px;border:0;border-radius:10px;background:var(--acc);color:#1b1b1b;font:inherit;font-weight:700;cursor:pointer}
.mq-tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:8px 0 16px}
.mq-tile{display:flex;flex-direction:column;justify-content:center;min-height:64px;padding:10px 12px;border:2px solid var(--pri2);border-radius:10px;background:#fff;color:var(--pri);text-decoration:none;line-height:1.25}
.mq-tile span{font-size:.8rem;color:var(--mute);margin-top:3px}
.mq-arch{columns:2}
/* Balbharati textbooks */
.tb-list{list-style:none;padding:0;margin:8px 0 16px;display:grid;gap:10px}
.tb-row{display:flex;gap:12px;align-items:flex-start;background:#fff;border:1px solid #dde3f0;border-radius:var(--r);padding:10px}
.tb-row img{flex:0 0 auto;width:75px;height:106px;object-fit:cover;border-radius:4px;border:1px solid #ddd}
.tb-row div{display:flex;flex-direction:column;gap:4px;min-width:0}
.tb-nocov{font-size:2.4rem}
.tb-btns{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:4px}
.tb-btns .tb-dl{margin-top:0}
.tb-dl2{display:inline-flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:10px;border:2px solid var(--pri);color:var(--pri);font-weight:700;text-decoration:none;background:#fff}
.tb-note{margin:8px 0 14px;padding:10px 12px;border-radius:var(--r);background:#fff7e6;border:1px solid #f5c26b;font-size:.95rem;line-height:1.5}
.tb-dl{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 14px;margin-top:4px;border-radius:10px;background:var(--pri);color:#fff;font-weight:700;text-decoration:none;align-self:flex-start}

/* timed quiz (Vivek Oct 26): one question at a time, 15 s bar, big tap targets */
.mq-start{margin:12px 0;padding:12px;border:2px dashed var(--pri2);border-radius:var(--r);background:#f4f7ff;text-align:center}
.mq-start[hidden]{display:none}
.mq-go{display:block;width:100%;min-height:56px;padding:12px 16px;border:0;border-radius:12px;background:var(--pri);color:#fff;font:inherit;font-size:1.15rem;font-weight:700;cursor:pointer}
.mq-go:focus-visible,.mq-rev:focus-visible,.mq-reset:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
.mq-start p{margin:8px 0 0;font-size:.9rem;color:var(--mute)}
.mq-timed .mq{display:none}
.mq-timed .mq.cur{display:block}
.mq-timed .mq-x,.mq-timed .mq-ch{display:none}
.mq-timed .mq-b{min-height:56px;font-size:1.08rem;padding:12px 14px}
.mq-timed .mq-q{font-size:1.15rem}
.mq-timed .mq-q::before{content:none}
.mq-tbar{position:sticky;top:0;z-index:6;display:grid;grid-template-columns:1fr auto;align-items:center;gap:4px 10px;background:#fff;border:2px solid var(--pri2);border-radius:12px;padding:8px 12px;margin:12px 0 10px}
.mq-tp{font-weight:700;color:var(--pri)}
.mq-tn{font-weight:800;font-size:1.6rem;line-height:1;min-width:2ch;text-align:right;color:var(--pri)}
.mq-tt{grid-column:1/-1;height:10px;border-radius:6px;background:#e3e9f8;overflow:hidden}
.mq-tf{height:100%;width:100%;background:#16a34a;transform-origin:left center;transform:scaleX(1);will-change:transform}
.mq-tbar.low .mq-tn{color:#dc2626}
.mq-tbar.low .mq-tf{background:#dc2626}
.mq-tu{margin:6px 0 8px;padding:6px 10px;border-radius:8px;background:#fff4d6;color:#7a4a00;font-weight:700}
.mq-skip{border-color:#e0a800}
.mq-res p{margin:0 0 8px}
.mq-rrow{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px}
.mq-pill{padding:4px 10px;border-radius:999px;background:#fff;color:#1b1b1b;font-size:.95rem}
.mq-pill.r{background:#e8f8ee;color:#0f6b31}.mq-pill.w{background:#fdecec;color:#9b1c1c}.mq-pill.u{background:#fff4d6;color:#7a4a00}
.mq-res{margin:12px 0;padding:14px;border-radius:var(--r);background:var(--pri);color:#fff}
.mq-res .mq-final{font-size:1.2rem;font-weight:800}
.mq-res .mq-reset,.mq-rev{min-height:48px}
.mq-rev{margin-left:8px;padding:8px 16px;border:2px solid #fff;border-radius:10px;background:transparent;color:#fff;font:inherit;font-weight:700;cursor:pointer}