:root{--ink:#0e1a33;--navy:#12294f;--saf:#f28c28;--saf2:#fff1e0;--bg:#f4f6fb;--card:#fff;--line:#dce2ee;--mut:#5a6680;--ok:#138a5b;--bad:#c0392b;--r:12px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 "Libre Franklin",system-ui,sans-serif;color:var(--ink);background:var(--bg)}
h1,h2,h3{font-family:Newsreader,Georgia,serif;color:var(--navy);line-height:1.15;margin:0 0 .5em}
h1{font-size:clamp(2.2rem,5vw,3.6rem)}h2{font-size:clamp(1.5rem,3vw,2.1rem)}h3{font-size:1.2rem}
a{color:inherit}.wrap{max-width:1120px;margin:0 auto;padding:0 20px}.sec{padding:56px 0}.mut{color:var(--mut)}
:focus-visible{outline:3px solid #5b9dff;outline-offset:2px}
.hdr{background:var(--navy);color:#fff;position:sticky;top:0;z-index:20}
.hdr .wrap{display:flex;align-items:center;gap:20px;min-height:66px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 1.35rem Newsreader,serif}
.brand i{display:grid;place-items:center;width:34px;height:34px;background:var(--saf);color:var(--navy);border-radius:8px;font-style:normal}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center;flex-wrap:wrap}
.nav a{padding:8px 12px;border-radius:8px;text-decoration:none;color:#d6def0}
.nav a:hover,.nav a.on{background:rgba(255,255,255,.12);color:#fff}
.nav a.cta{background:var(--saf);color:var(--navy);font-weight:600;margin-left:6px}
.btn,button{font-family:inherit;font-size:1rem;font-weight:600;border:0;border-radius:8px;padding:11px 20px;background:var(--saf);color:var(--navy);cursor:pointer;text-decoration:none;display:inline-block}
.btn.line{background:transparent;border:1.5px solid currentColor;color:inherit}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.chip{background:#fff;border:1px solid var(--line);color:var(--ink);padding:7px 15px;border-radius:99px;font-weight:500}
.chip.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.hero{background:var(--navy);color:#fff;padding:64px 0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:32px 32px}
.hero h1{color:#fff}.hero p{color:#c9d3ea;max-width:48ch}
.hero .g{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.desk{background:#fff;color:var(--ink);border-radius:var(--r);padding:8px 20px;box-shadow:0 14px 40px rgba(0,0,0,.3)}
.desk h3{padding-top:14px;margin:0}
.row{display:block;text-decoration:none;padding:14px 0;border-bottom:1px solid var(--line)}
.row:last-child{border:0}.row b{display:block;font-weight:600}.row:hover b{color:#c96a00}
.row small{color:var(--mut)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;text-decoration:none;display:flex;flex-direction:column;gap:6px}
a.card:hover{border-color:var(--saf);transform:translateY(-2px);transition:.15s}
.card p{margin:0;color:var(--mut);flex:1}.card small{color:var(--mut)}
.tag{align-self:flex-start;background:var(--saf2);color:#9a5300;font-weight:600;font-size:.82rem;padding:2px 10px;border-radius:99px}
.strip{background:#fff;border-block:1px solid var(--line)}
.strip .wrap{display:flex;gap:36px;flex-wrap:wrap;padding:22px 20px}.strip b{font:700 1.7rem Newsreader,serif;color:var(--navy);display:block;line-height:1}
.search{width:100%;max-width:420px;padding:11px 14px;border:1px solid var(--line);border-radius:8px;font:inherit}
.prog{position:fixed;top:0;left:0;height:4px;background:var(--saf);width:0;z-index:30}
.art{display:grid;grid-template-columns:230px minmax(0,1fr);gap:40px;align-items:start}
.toc{position:sticky;top:90px;font-size:.93rem}.toc a{display:block;padding:4px 0 4px 12px;border-left:2px solid var(--line);text-decoration:none;color:var(--mut)}
.toc a:hover{color:var(--navy);border-color:var(--saf)}
.body{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:32px;max-width:78ch}
.body h2{margin-top:1.4em}.body h2:first-child{margin-top:0}
.body table{border-collapse:collapse;width:100%;margin:1em 0}.body td,.body th{border:1px solid var(--line);padding:8px 10px;text-align:left}.body th{background:var(--bg)}
.acts{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 26px}.acts .btn,.acts button{padding:8px 14px;font-size:.92rem;background:#fff;border:1px solid var(--line);color:var(--ink)}
.box{border-left:4px solid var(--navy);background:var(--bg);padding:12px 18px;border-radius:0 8px 8px 0;margin:1.2em 0}
.box.keypoints{border-color:var(--saf);background:var(--saf2)}.box.tip{border-color:var(--ok);background:#e6f6ef}
details.answer{border:1.5px solid var(--ok);border-radius:var(--r);margin:1.2em 0;overflow:hidden}
details.answer summary{cursor:pointer;background:#e6f6ef;color:var(--ok);font-weight:600;padding:12px 18px}
details.answer[open] summary{border-bottom:1px solid var(--ok)}details.answer>*:not(summary){margin-inline:18px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px}
.opt{display:block;width:100%;text-align:left;background:var(--bg);border:1px solid var(--line);color:var(--ink);font-weight:400;margin:8px 0}
.opt.right{background:#dff3ec;border-color:var(--ok)}.opt.wrong{background:#f9e0dc;border-color:var(--bad)}
.why{margin:12px 0;padding:10px 14px;border-left:4px solid var(--saf);background:var(--saf2)}
.bar{height:6px;background:var(--line);border-radius:9px;overflow:hidden;margin-bottom:16px}.bar i{display:block;height:100%;background:var(--saf)}
label{display:block;font-weight:600;margin:14px 0 4px}
input,select,textarea{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff}
.two{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
ul.ticks{padding-left:18px;margin:0 0 14px;color:var(--mut)}
.ftr{background:var(--ink);color:#aeb9d1;padding:36px 0;font-size:.93rem}.ftr .wrap{display:flex;gap:30px;justify-content:space-between;flex-wrap:wrap}.ftr b{color:#fff}
@media(max-width:820px){.hero .g,.art,.two{grid-template-columns:1fr}.toc{position:static}.body{padding:20px}.nav{margin-left:0}}
@media print{.hdr,.ftr,.toc,.acts,.prog{display:none}.art{display:block}.body{border:0;padding:0}details.answer>summary{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* practice + mains */
.crumbs{margin:0 0 18px;color:var(--mut);font-size:.93rem}.crumbs a{color:var(--navy);font-weight:500}
.opt{padding:11px 16px;border-radius:8px}div.opt{cursor:default}
.opt.sel{border-color:var(--navy);background:#e8eefb}
.quizbar{display:flex;justify-content:space-between;align-items:center;background:var(--navy);color:#fff;padding:12px 18px;border-radius:var(--r);margin-bottom:16px}
.clock{font:700 1.3rem Newsreader,serif;background:rgba(255,255,255,.14);padding:2px 14px;border-radius:8px}
.qgrid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:18px;align-items:start}
.row2{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.row2 .btn{padding:9px 14px}.row2 button:last-child{margin-left:auto}
button:disabled{opacity:.45;cursor:not-allowed}
.palg{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:12px 0}
.pn{padding:7px 0;background:#fff;border:1px solid var(--line);color:var(--ink);border-radius:6px}
.pn.ans{background:var(--saf);border-color:var(--saf)}.pn.mk{box-shadow:0 0 0 3px #7a5cff}.pn.cur{outline:2px solid var(--navy);outline-offset:1px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin:18px 0}
.stats div{background:var(--bg);border-radius:10px;padding:14px}.stats b{display:block;font:700 1.8rem Newsreader,serif;color:var(--navy);line-height:1.1}
@media(max-width:820px){.qgrid{grid-template-columns:1fr}}
/* accounts + admin */
.thumbs{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.thumbs img{height:110px;border-radius:8px;border:1px solid var(--line);cursor:zoom-in}
.thumbs img.big{height:auto;max-width:100%;cursor:zoom-out}
.tw{overflow-x:auto}table.t{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--r)}
table.t td,table.t th{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left}table.t th{background:var(--bg);font-weight:600}
input[type=file]{padding:8px;background:var(--bg)}