:root{--bg:#f6f8f5;--fg:#16231e;--mut:#58675f;--acc:#0d6b4e;--acc2:#e08a1e;--soft:#e3efe9;--line:#d3ddd7;--card:#fff;--ok:#0d7a45;--bad:#b3261e;--okbg:#dcf3e6;--badbg:#fbe3e1;--wm:0,0,0}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0e1612;--fg:#e4eee9;--mut:#9db0a6;--acc:#4cc79a;--acc2:#f0a64a;--soft:#15251e;--line:#26372f;--card:#13201a;--ok:#5fd493;--bad:#ff8a80;--okbg:#12301f;--badbg:#3a1a18;--wm:255,255,255;color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;position:relative}
a{color:var(--acc)}
img,svg{max-width:100%}
.wrap{max-width:60rem;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.skip{position:absolute;left:-999px;top:0;background:var(--acc);color:#fff;padding:.5rem 1rem;z-index:50}
.skip:focus{left:8px;top:8px}
/* watermark: light, repeated, never blocks taps */
.wm{position:fixed;inset:0;z-index:40;pointer-events:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='300' height='220'><text x='150' y='120' text-anchor='middle' transform='rotate(-24 150 110)' font-family='Georgia,serif' font-size='34' font-weight='700' fill='%23000' fill-opacity='.055'>Sir Basit</text></svg>");background-size:300px 220px}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .wm{background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='300' height='220'><text x='150' y='120' text-anchor='middle' transform='rotate(-24 150 110)' font-family='Georgia,serif' font-size='34' font-weight='700' fill='%23fff' fill-opacity='.06'>Sir Basit</text></svg>")}}
/* header */
.top{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;padding-bottom:.6rem}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-top:.6rem;padding-bottom:.4rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--fg);font-weight:700}
.logo{display:inline-grid;place-items:center;width:2.2rem;height:2.2rem;border-radius:10px;background:var(--acc);color:#fff;font-weight:800;font-size:.95rem}
.bname{font-size:1.1rem}
.mnav{display:flex;gap:.3rem;flex-wrap:wrap}
.mnav a{text-decoration:none;color:var(--fg);padding:.3rem .7rem;border-radius:99px;font-size:.92rem;border:1px solid transparent}
.mnav a:hover,.mnav a:focus-visible{border-color:var(--acc);color:var(--acc);outline:none}
.sform{position:relative;display:flex;gap:.5rem;margin:.3rem 0 0}
.sform input{flex:1;min-width:0;padding:.7rem .9rem;font:inherit;font-size:16px;border:2px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg)}
.sform input:focus{outline:none;border-color:var(--acc)}
.sform button{padding:.7rem 1.1rem;font:inherit;font-weight:600;border:0;border-radius:10px;background:var(--acc);color:#fff;cursor:pointer}
.sform.big{margin:1rem 0}
.sres{position:absolute;left:0;right:0;top:calc(100% + 6px);background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 32px rgba(0,0,0,.18);max-height:70vh;overflow:auto;z-index:60;padding:.4rem}
.sres[hidden]{display:none}
.sres h4{margin:.5rem .6rem .2rem;font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--mut)}
.sres a,.sfull a.sr{display:block;padding:.5rem .6rem;border-radius:8px;text-decoration:none;color:var(--fg)}
.sres a:hover,.sres a:focus-visible,.sfull a.sr:hover{background:var(--soft);outline:none}
.sres small,.sfull small{display:block;color:var(--mut);font-size:.82rem;line-height:1.35}
.sres mark,.sfull mark{background:rgba(224,138,30,.3);color:inherit;border-radius:3px}
.sfull a.sr{border:1px solid var(--line);margin:.5rem 0;background:var(--card)}
/* layout */
.crumbs{font-size:.85rem;color:var(--mut);padding-top:.8rem;padding-bottom:0}
.crumbs a{color:var(--mut)}
.crumbs i{font-style:normal;margin:0 .15rem;opacity:.6}
.main{padding-top:1rem;padding-bottom:3rem;position:relative;z-index:1}
h1{font-size:clamp(1.55rem,4.2vw,2.15rem);line-height:1.2;margin:.8rem 0 .5rem;text-wrap:balance}
h2{font-size:1.4rem;line-height:1.25;margin:2rem 0 .6rem}
h3{font-size:1.1rem;color:var(--acc);margin:1.4rem 0 .4rem}
.lead{color:var(--mut);font-size:1.02rem;margin:.2rem 0 1rem;max-width:46rem}
.hero{padding:.6rem 0 .4rem}
.hero h1{font-size:clamp(1.8rem,5.5vw,2.7rem)}
.stats{font-size:.98rem;background:var(--soft);display:inline-block;padding:.4rem .9rem;border-radius:99px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(14.5rem,1fr));gap:.8rem}
.grid.three{grid-template-columns:repeat(auto-fill,minmax(12rem,1fr))}
.card{position:relative;display:block;padding:1rem 1.1rem;background:var(--card);border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--fg);transition:transform .15s,border-color .15s}
.card:hover,.card:focus-visible{border-color:var(--acc);transform:translateY(-2px);outline:none}
.card strong{display:block;font-size:1.08rem}
.card small{display:block;color:var(--mut);margin-top:.15rem}
.badge{position:absolute;top:.7rem;right:.8rem;font-size:.68rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:#fff;background:var(--acc2);padding:.1rem .45rem;border-radius:99px}
.actions{display:flex;flex-wrap:wrap;gap:.6rem;margin:.6rem 0 1rem}
.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem 1.1rem;border-radius:10px;background:var(--acc);color:#fff;text-decoration:none;font:inherit;font-weight:600;font-size:.95rem;border:2px solid var(--acc);cursor:pointer}
.btn small{font-weight:400;opacity:.85}
.btn.ghost{background:transparent;color:var(--acc)}
.btn:hover{filter:brightness(1.08)}
.btn:focus-visible{outline:3px solid var(--acc2);outline-offset:2px}
.chlist{list-style:none;padding:0;margin:0;border:1px solid var(--line);border-radius:14px;background:var(--card);overflow:hidden}
.chlist li{display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;justify-content:space-between;padding:.8rem 1rem;border-bottom:1px solid var(--line)}
.chlist li:last-child{border:0}
.chn a{font-weight:600;text-decoration:none}
.chn .un{display:inline-block;min-width:4.2rem;color:var(--mut);font-size:.88rem}
.chl{display:flex;gap:.4rem;flex-wrap:wrap}
.pill{text-decoration:none;padding:.3rem .8rem;border-radius:99px;font-size:.88rem;font-weight:600;background:var(--soft);color:var(--acc);border:1px solid var(--line)}
.pill.alt{background:var(--acc);color:#fff;border-color:var(--acc)}
.pill.dlp{background:transparent}
.pill.big{padding:.5rem 1.1rem}
.pill:hover{border-color:var(--acc)}
.dls{padding-left:1.2rem}.dls li{margin:.3rem 0}.dls small{color:var(--mut)}
.steps li{margin:.4rem 0}
.cta{margin-top:1.6rem;padding:1rem;background:var(--soft);border-radius:12px}
/* MCQs */
.tools{position:sticky;top:7.6rem;z-index:20;display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.55rem .9rem;margin:.6rem 0 1rem}
.tools .btn{padding:.35rem .8rem;font-size:.85rem}
.tg{display:flex;align-items:center;gap:.4rem;font-weight:600;font-size:.92rem}
.tg input{width:1.1rem;height:1.1rem;accent-color:var(--acc)}
.score{flex:1;min-width:10rem;font-size:.9rem;color:var(--mut)}
.q{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:.9rem 1rem;margin:.8rem 0}
.qt{margin:0 0 .6rem;font-weight:600}
.opts{list-style:none;padding:0;margin:0;display:grid;gap:.4rem}
.opt{display:flex;gap:.6rem;align-items:flex-start;width:100%;text-align:left;padding:.55rem .7rem;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font:inherit;font-size:.97rem;cursor:pointer}
.opt:hover{border-color:var(--acc)}
.opt:focus-visible{outline:3px solid var(--acc2);outline-offset:1px}
.ol{flex:none;width:1.6rem;height:1.6rem;border-radius:50%;display:inline-grid;place-items:center;background:var(--soft);font-weight:700;font-size:.82rem;color:var(--acc)}
.ot{flex:1}
.q.done .opt{cursor:default}
.opt.right{border-color:var(--ok);background:var(--okbg)}
.opt.wrong{border-color:var(--bad);background:var(--badbg)}
.ans{display:none;margin:.6rem 0 0;padding:.5rem .7rem;border-left:4px solid var(--ok);background:var(--okbg);border-radius:6px;font-size:.95rem}
.q.done .ans,body.show-ans .ans{display:block}
body.show-ans .opt[data-c="1"]{border-color:var(--ok);background:var(--okbg)}
.stem{background:var(--soft);border-left:4px solid var(--acc2);padding:.7rem .9rem;border-radius:8px;margin:1.2rem 0 .3rem;font-size:.97rem}
.pager{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center;margin:.8rem 0;font-size:.92rem;color:var(--mut)}
.pager a{padding:.25rem .7rem;border:1px solid var(--line);border-radius:8px;text-decoration:none;background:var(--card)}
.pager a.cur{background:var(--acc);color:#fff;border-color:var(--acc)}
.pn{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin:1.6rem 0 0}
.pn a{padding:.6rem 1rem;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:var(--card)}
/* notes prose */
.prose{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:.4rem 1.1rem 1.1rem;overflow-wrap:anywhere}
.prose h2{border-top:3px solid var(--acc);padding-top:.8rem}
.prose table{border-collapse:collapse;display:block;overflow-x:auto;max-width:100%}
.prose td,.prose th{border:1px solid var(--line);padding:.35rem .6rem;vertical-align:top}
.prose ul,.prose ol{padding-left:1.3rem}
.prose li{margin:.25rem 0}
.prose .q{margin:1.2rem 0 .3rem;padding:.7rem .9rem;background:var(--soft);border:0;border-left:4px solid var(--acc);border-radius:4px;font-weight:400}
.prose ol.pts,.prose .desc{background:var(--card)}
.prose .tag{font:600 .7rem system-ui;letter-spacing:.05em;text-transform:uppercase;padding:.1rem .4rem;border:1px solid currentColor;border-radius:3px;margin-right:.3rem;white-space:nowrap}
.prose .model{color:#b4540a}.prose .school{color:#5b3fa0}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .prose .model{color:#f0a064}:root:not([data-theme=light]) .prose .school{color:#b9a4f2}}
.prose .lead{color:var(--mut)}
.prose h4{color:var(--acc);margin:1rem 0 .2rem}
.prose .ph{color:var(--acc);font-weight:600}
/* computer 11 question bank markup */
.qbank .sub{color:var(--mut);margin:.2rem 0 .6rem}
.qbank .chips{display:flex;flex-wrap:wrap;gap:.4rem;margin:.4rem 0 .8rem}
.qbank .chip{background:var(--soft);color:var(--acc);padding:.15rem .6rem;border-radius:99px;font-size:.82rem;font-weight:600}
.qbank .note{background:var(--soft);border-left:4px solid var(--acc2);padding:.7rem .9rem;border-radius:6px;margin:.8rem 0}
.qbank .card{display:block;padding:.2rem 0 .6rem;margin:.9rem 0;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;transform:none}
.qbank .qh{display:flex;gap:.6rem;font-weight:700}
.qbank .qid{flex:none;background:var(--acc);color:#fff;border-radius:6px;padding:0 .5rem;font-size:.85rem;height:1.5rem;line-height:1.5rem}
.qbank .tags{margin:.3rem 0}
.qbank .tag{font:600 .66rem system-ui;letter-spacing:.05em;text-transform:uppercase;padding:.05rem .4rem;border:1px solid var(--mut);border-radius:4px;color:var(--mut);margin-right:.3rem}
.qbank .tag.likely{color:var(--acc2);border-color:var(--acc2)}
.qbank h2 span{font-size:.8rem;font-weight:400;color:var(--mut);margin-left:.6rem}
/* footer */
.foot{border-top:1px solid var(--line);background:var(--card);padding:1.4rem 0 2rem;position:relative;z-index:1;text-align:center;color:var(--mut);font-size:.92rem}
.foot p{margin:.3rem 0}
.fphone{font-weight:700;color:var(--fg);font-size:1.05rem;margin-top:.7rem !important}
.fphone a{color:var(--acc);text-decoration:none}
.sup{vertical-align:super}
@media (max-width:600px){.tools{top:8.6rem}.top-in{padding-top:.4rem}.bname{font-size:1rem}.mnav a{padding:.25rem .55rem;font-size:.85rem}}
@media print{.top,.crumbs,.tools,.actions,.pager,.pn,.foot .fnote,.sform{display:none!important}body{background:#fff;color:#000;font-size:12pt}.wm{display:block}.q,.prose{border-color:#999;break-inside:avoid-page}.ans{display:block!important}.opt[data-c="1"]{font-weight:700;border-color:#000!important;background:#eee!important}.fphone a{color:#000}}

/* ---- v2 design ---- */
.hero{background:linear-gradient(135deg,#0d6b4e 0%,#0b8a63 55%,#1aa57a 100%);color:#fff;border-radius:22px;padding:clamp(1.4rem,4vw,2.6rem);margin:.4rem 0 1.2rem;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero-in{position:relative;z-index:1;max-width:44rem}
.hero h1{color:#fff;font-size:clamp(1.8rem,5.6vw,2.8rem);margin:.3rem 0 .6rem}
.hero .lead{color:rgba(255,255,255,.92);font-size:1.05rem}
.eyebrow{display:inline-block;margin:0;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;background:rgba(255,255,255,.18);padding:.25rem .7rem;border-radius:99px}
.hero .btn{background:#fff;color:#0d6b4e;border-color:#fff}
.hero .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn.big{padding:.8rem 1.4rem;font-size:1.02rem}
.try{font-size:.9rem;margin:.4rem 0 0;color:rgba(255,255,255,.85)}
.try a{color:#fff;background:rgba(255,255,255,.16);padding:.15rem .6rem;border-radius:99px;text-decoration:none;margin:0 .15rem .2rem 0;display:inline-block}
.statrow{display:grid;grid-template-columns:repeat(3,1fr);gap:.7rem;margin:0 0 1.2rem}
.statrow div{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:.8rem;text-align:center}
.statrow b{display:block;font-size:clamp(1.3rem,4vw,1.8rem);color:var(--acc);line-height:1.1}
.statrow span{font-size:.85rem;color:var(--mut)}
.feat{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:.8rem;margin:0 0 1rem}
.feat div{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem}
.feat h3{margin:.4rem 0 .2rem;color:var(--fg)}
.feat p{margin:0;color:var(--mut);font-size:.95rem}
.fi{font-size:1.6rem}
.card{display:flex;gap:.8rem;align-items:center;border-left:5px solid var(--c,var(--acc))}
.ico{flex:none;display:inline-grid;place-items:center;width:2.8rem;height:2.8rem;border-radius:12px;background:color-mix(in srgb,var(--c,#0d6b4e) 16%,transparent);font-size:1.4rem;font-weight:800;color:var(--c,var(--acc))}
.ctx{min-width:0}
.card:hover{box-shadow:0 8px 22px rgba(0,0,0,.12)}
.badge{top:.5rem;right:.6rem}
.mnav a.hot{background:var(--acc2);color:#fff}
.chlist li:nth-child(even){background:color-mix(in srgb,var(--soft) 40%,transparent)}
.chn .un{background:var(--soft);padding:.05rem .5rem;border-radius:6px;min-width:0;margin-right:.4rem;font-weight:700;color:var(--acc)}
h2{position:relative;padding-left:.8rem}
h2:before{content:"";position:absolute;left:0;top:.2em;bottom:.2em;width:4px;border-radius:2px;background:var(--acc2)}
.prose h2{padding-left:0;border-top:3px solid var(--acc)}.prose h2:before{display:none}
.qbank h2:before{display:none}.qbank h2{padding-left:0}
.faq{margin-top:2rem}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:.5rem 0;padding:.2rem 1rem}
.faq summary{cursor:pointer;font-weight:600;padding:.6rem 0;list-style-position:outside}
.faq p{margin:0 0 .8rem;color:var(--mut)}
.related{margin-top:2rem}
.related ul{columns:2 16rem;padding-left:1.2rem}
.flinks{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;justify-content:center;margin-bottom:.6rem}
.flinks a{color:var(--mut)}
@media (max-width:600px){.statrow{gap:.4rem}.hero{border-radius:16px}}
.card .badge{position:static;margin-left:auto;flex:none;align-self:flex-start;white-space:nowrap}

/* ---- v3: simple class tabs and seo text ---- */
.hero-s{padding:clamp(1.1rem,3vw,1.8rem)}
.hero-s h1{font-size:clamp(1.5rem,4.6vw,2.3rem);margin:0 0 .4rem}
.hero-s .lead{margin:0}
.tabs{display:flex;gap:.5rem;margin:1.2rem 0 .4rem}
.tab{flex:1;padding:.9rem .6rem;font:inherit;font-size:1.1rem;font-weight:700;border:2px solid var(--line);border-radius:14px;background:var(--card);color:var(--fg);cursor:pointer}
.tab.on{background:var(--acc);border-color:var(--acc);color:#fff}
.tab:focus-visible{outline:3px solid var(--acc2);outline-offset:2px}
.js .panel{display:none}.js .panel.on{display:block}
.panel h2{margin-top:1rem}
.more{margin:.8rem 0 0}
.seo-text{margin-top:2.2rem;padding:1.1rem 1.2rem;background:var(--card);border:1px solid var(--line);border-radius:14px;color:var(--fg)}
.seo-text h2{margin-top:.2rem}
.seo-text h3{margin:1.1rem 0 .3rem}
.seo-text p,.seo-text li{color:var(--mut)}
.seo-text b{color:var(--fg)}

/* ---- v4: eight tabs ---- */
.tabs.eight{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem}
@media (min-width:700px){.tabs.eight{grid-template-columns:repeat(4,1fr)}}
.tab small{display:block;font-weight:600;font-size:.78rem;opacity:.85;margin-top:.1rem}
.tab{padding:.7rem .4rem;font-size:1.02rem}