:root{--ink:#203544;--muted:#6b7c88;--blue:#264e61;--green:#426955;--border:#dce4e5;--paper:#f4f6f2;--white:#fff;
--soft:#eef3f1;--accent:#b8652b;--ok:#2f7a4f;--bad:#a23b3b;--radius:18px;--shadow:0 1px 2px rgba(32,53,68,.06),0 6px 22px rgba(32,53,68,.06);
--head:"Manrope",system-ui,sans-serif;--body:"DM Sans",system-ui,sans-serif;--side:270px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--body)}
h1,h2,h3,h4{font-family:var(--head);line-height:1.2;margin:0 0 .5em;color:var(--ink)}
a{color:var(--blue)}button{font:inherit;cursor:pointer}
img,svg{max-width:100%}
/* ---------- frame banner ---------- */
#frameBanner{position:sticky;top:0;z-index:60;background:#fff6e5;border-bottom:1px solid #f0d9ae;padding:.6rem 1rem;font-size:.9rem;text-align:center}
#frameBanner a{font-weight:700}
/* ---------- sidebar ---------- */
#sidebar{position:fixed;inset:0 auto 0 0;width:var(--side);background:var(--blue);color:#e6eef0;padding:1.2rem 1rem;overflow:auto;
display:flex;flex-direction:column;gap:.35rem;z-index:50;transform:translateX(-102%);transition:transform .25s}
#sidebar.open{transform:none}
#brand{display:flex;gap:.7rem;align-items:center;color:#fff;text-decoration:none;font-family:var(--head);font-weight:800;font-size:1.02rem;margin-bottom:1rem}
#brand small{display:block;font-family:var(--body);font-weight:500;font-size:.68rem;letter-spacing:.14em;opacity:.75}
.brand-symbol{flex:0 0 44px;height:44px;border-radius:12px;background:#fff;color:var(--blue);display:grid;place-items:center;font-size:1.4rem;font-weight:800;
box-shadow:inset 0 -4px 0 var(--green)}
.side-button,#sidebar nav a{display:flex;gap:.6rem;align-items:center;width:100%;text-align:left;background:transparent;border:0;color:#e6eef0;
padding:.55rem .7rem;border-radius:12px;text-decoration:none;font-size:.93rem}
.side-button:hover,#sidebar nav a:hover,#sidebar nav a.active{background:rgba(255,255,255,.12);color:#fff}
#sidebar nav a .sym{width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.14);display:grid;place-items:center;font-weight:700;flex:0 0 26px}
.side-label{font-size:.68rem;letter-spacing:.14em;opacity:.65;margin:1rem .7rem .2rem}
.side-foot{margin-top:auto;font-size:.78rem;opacity:.75;padding:.8rem .7rem 0;border-top:1px solid rgba(255,255,255,.15)}
#scrim{position:fixed;inset:0;background:rgba(20,35,45,.35);z-index:40}
/* ---------- shell ---------- */
.shell{min-height:100vh;display:flex;flex-direction:column}
header{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:.6rem;padding:.7rem 1rem;background:rgba(244,246,242,.92);
backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
#breadcrumb{font-family:var(--head);font-weight:700;font-size:.95rem;flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.header-actions{display:flex;gap:.4rem}
.header-actions .secondary{font-size:.82rem;padding:.45rem .7rem}
main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:1.2rem 1rem 3rem}
footer{text-align:center;color:var(--muted);font-size:.85rem;padding:1.5rem 1rem;border-top:1px solid var(--border)}
footer span{color:var(--green);font-weight:600}
.loading{color:var(--muted);padding:3rem 0;text-align:center}
/* ---------- buttons ---------- */
.primary,.secondary,.ghost{border-radius:999px;padding:.6rem 1.05rem;font-weight:600;border:1px solid transparent;font-size:.95rem}
.primary{background:var(--blue);color:#fff}.primary:hover{background:#1d3e4e}
.secondary{background:#fff;color:var(--blue);border-color:var(--border)}.secondary:hover{border-color:var(--blue)}
.ghost{background:transparent;color:var(--blue);border-color:transparent;padding:.45rem .7rem}
.icon{background:#fff;border:1px solid var(--border);border-radius:12px;width:40px;height:40px;font-size:1.2rem;color:var(--ink)}
button:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}
/* ---------- cards ---------- */
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem;box-shadow:var(--shadow)}
.grid{display:grid;gap:1rem}
.kicker{font-size:.72rem;letter-spacing:.16em;color:var(--green);font-weight:700;text-transform:uppercase}
.hero{padding:1.6rem 1.3rem;background:linear-gradient(135deg,#fff 0%,#eef4f2 100%)}
.hero h1{font-size:clamp(1.8rem,6vw,2.6rem);margin:.3rem 0 .4rem}
.hero p{color:var(--muted);font-size:1.05rem;margin:0}
.section-title{margin:2rem 0 .8rem;font-size:1.25rem}
.concept-card{display:flex;flex-direction:column;gap:.7rem}
.concept-card .top{display:flex;gap:.8rem;align-items:center}
.tile{width:52px;height:52px;border-radius:14px;background:var(--soft);color:var(--blue);display:grid;place-items:center;font:800 1.5rem var(--head);flex:0 0 52px}
.concept-card h3{font-size:1.05rem;margin:0}
.meta{font-size:.85rem;color:var(--muted)}
.pill{display:inline-block;font-size:.75rem;padding:.15rem .6rem;border-radius:999px;background:var(--soft);color:var(--green);font-weight:700}
.progressbar{height:6px;border-radius:9px;background:var(--soft);overflow:hidden}.progressbar i{display:block;height:100%;background:var(--green)}
.mock-card .label{font-size:.72rem;letter-spacing:.14em;font-weight:700;color:var(--accent)}
.note{font-size:.88rem;color:var(--muted);background:#fff;border:1px dashed var(--border);border-radius:14px;padding:.8rem 1rem;margin-top:1.4rem}
/* ---------- concept page ---------- */
.page-head{display:flex;gap:1rem;align-items:center;margin-bottom:1rem}
.page-head h1{font-size:clamp(1.35rem,4.5vw,1.9rem);margin:0}
.tabs{display:flex;gap:.35rem;overflow-x:auto;padding:.3rem;background:#fff;border:1px solid var(--border);border-radius:999px;margin-bottom:1rem;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{flex:0 0 auto;border:0;background:transparent;padding:.5rem .9rem;border-radius:999px;color:var(--muted);font-weight:600;font-size:.9rem;white-space:nowrap}
.tabs button.active{background:var(--blue);color:#fff}
.tabs button.locked{color:#a6b2b9}
.learn{display:grid;gap:1rem}
.learn-nav{display:flex;gap:.4rem;overflow-x:auto}
.learn-nav a{flex:0 0 auto;padding:.45rem .8rem;border-radius:12px;text-decoration:none;color:var(--muted);background:#fff;border:1px solid var(--border);font-size:.9rem}
.learn-nav a.active{color:#fff;background:var(--green);border-color:var(--green)}
.prose p{margin:.5rem 0}.prose ul,.prose ol{padding-left:1.3rem}
.example{border-top:1px solid var(--border);padding-top:1rem;margin-top:1rem}
.example:first-child{border-top:0;margin-top:0;padding-top:0}
.homework li{margin:.5rem 0}
table.mini{border-collapse:collapse;margin:.6rem 0}table.mini td,table.mini th{border:1px solid var(--border);padding:.35rem .8rem;text-align:left}
.locked-panel{text-align:center;padding:2.2rem 1rem}.locked-panel .lock{font-size:2rem}
/* ---------- question card ---------- */
.qcard{display:grid;gap:.9rem}
.qhead{display:flex;justify-content:space-between;gap:.6rem;align-items:center;flex-wrap:wrap}
.qhead h3{margin:0;font-size:1.08rem}
.level-tag{font-size:.7rem;letter-spacing:.12em;font-weight:800;padding:.2rem .6rem;border-radius:999px;text-transform:uppercase}
.lv-E{background:#e3f1e8;color:#2f7a4f}.lv-D{background:#fbeedf;color:#a65a1c}.lv-X{background:#e3ecf2;color:#264e61}.lv-exam{background:#f1e6ef;color:#7a3a6b}
.question{font-size:1.02rem}
figure.fig{margin:.4rem 0;padding:.6rem;background:#fbfcfb;border:1px solid var(--border);border-radius:14px;display:flex;justify-content:center}
svg.diagram{width:100%;height:auto;max-width:440px;display:block}
.parts{display:grid;gap:.5rem;margin:.4rem 0}
.parts .p{display:grid;grid-template-columns:2.2rem 1fr auto;gap:.4rem;align-items:start}
.parts .p b{color:var(--blue)}.marks{color:var(--muted);font-weight:700;white-space:nowrap}
details.solution{border:1px solid var(--border);border-radius:14px;background:#fbfcfb}
details.solution summary{cursor:pointer;padding:.7rem 1rem;font-weight:700;color:var(--blue);list-style:none}
details.solution summary::before{content:"▸ ";}details.solution[open] summary::before{content:"▾ "}
details.solution .body{padding:0 1rem 1rem}
.ms{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:.4rem}.ms td{border-top:1px solid var(--border);padding:.35rem .3rem;vertical-align:top}
.ms td:first-child{font-weight:800;color:var(--accent);width:3rem}
.checkline{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;justify-content:space-between}
.done-btn.done{background:var(--ok);color:#fff;border-color:var(--ok)}
.qnav{display:flex;justify-content:space-between;gap:.5rem}
.steps-hint li{margin:.25rem 0}
/* ---------- working studio ---------- */
.studio{border:1px solid var(--border);border-radius:16px;background:#fbfcfb;padding:.8rem;display:grid;gap:.7rem}
.studio-head{display:flex;justify-content:space-between;align-items:center;gap:.5rem;flex-wrap:wrap}
.studio-head h4{margin:0;font-size:.98rem}
.modes{display:flex;gap:.3rem;background:#fff;border:1px solid var(--border);border-radius:999px;padding:.2rem}
.modes button{border:0;background:transparent;border-radius:999px;padding:.35rem .7rem;font-size:.82rem;font-weight:600;color:var(--muted)}
.modes button.active{background:var(--green);color:#fff}
.symbar{display:flex;gap:.3rem;flex-wrap:wrap}
.symbar button{border:1px solid var(--border);background:#fff;border-radius:10px;min-width:40px;padding:.3rem .5rem;font-size:.9rem}
.step{display:flex;gap:.4rem;align-items:center}
.step .n{font-size:.75rem;color:var(--muted);width:1.4rem;text-align:right}
math-field{flex:1;min-width:0;font-size:1.15rem;border:1px solid var(--border);border-radius:12px;padding:.35rem .6rem;background:#fff}
math-field:focus-within{outline:2px solid #9cc0b0}
.step .del{border:0;background:transparent;color:var(--muted);font-size:1.1rem}
textarea.explain{width:100%;min-height:150px;border:1px solid var(--border);border-radius:12px;padding:.7rem;font:inherit;resize:vertical;background:#fff}
.drawwrap{display:grid;gap:.4rem}
.drawwrap canvas{width:100%;height:320px;background:#fff;border:1px solid var(--border);border-radius:12px;touch-action:none}
.drawtools{display:flex;gap:.3rem;flex-wrap:wrap;align-items:center}
.drawtools button{border:1px solid var(--border);background:#fff;border-radius:10px;padding:.3rem .6rem;font-size:.85rem}
.drawtools button.active{border-color:var(--blue);color:var(--blue);font-weight:700}
.swatch{width:22px;height:22px;border-radius:50%;display:inline-block;vertical-align:middle}
.studio-foot{display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}
.studio-foot .status{font-size:.8rem;color:var(--muted);margin-left:auto}
/* ---------- fresh check ---------- */
.fresh{border:1px solid #cfe0d4;background:#f4faf6}
.fresh .answer-row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}
.fresh input{font:inherit;border:1px solid var(--border);border-radius:12px;padding:.5rem .7rem;width:11rem;max-width:100%}
.feedback{font-weight:700}.feedback.ok{color:var(--ok)}.feedback.bad{color:var(--bad)}
.method{background:#fff;border:1px solid var(--border);border-radius:12px;padding:.6rem .9rem}
/* ---------- mocks ---------- */
.mock-bar{display:flex;justify-content:space-between;align-items:center;gap:.6rem;flex-wrap:wrap;margin-bottom:.8rem}
.timer{font:800 1.3rem var(--head);color:var(--blue);background:#fff;border:1px solid var(--border);border-radius:12px;padding:.25rem .8rem}
.timer.low{color:var(--bad);border-color:#e8b8b8}
.qdots{display:flex;gap:.3rem;flex-wrap:wrap}
.qdots a{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;text-decoration:none;border:1px solid var(--border);background:#fff;color:var(--ink);font-weight:700;font-size:.9rem}
.qdots a.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.choice{display:grid;gap:.8rem}
.score{font:800 2rem var(--head);color:var(--green)}
.bandtable td{padding:.4rem .5rem;border-top:1px solid var(--border);vertical-align:top}.bandtable td:first-child{font-weight:800;white-space:nowrap}
.bandtable tr.hit{background:#eef7f1}
.selfmark label{display:flex;gap:.5rem;align-items:flex-start;padding:.3rem 0;border-top:1px solid var(--border)}
.selfmark input{margin-top:.3rem;width:18px;height:18px}
.code{font-weight:800;color:var(--accent);min-width:2.2rem}
/* ---------- toolkit dialog ---------- */
dialog{border:0;border-radius:20px;padding:0;width:min(560px,94vw);max-height:88vh;box-shadow:0 20px 60px rgba(0,0,0,.25);color:var(--ink)}
dialog::backdrop{background:rgba(20,35,45,.4)}
.dialog-title{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.1rem;background:var(--blue);color:#fff}
.dialog-title h2{color:#fff;margin:0;font-size:1.15rem}.dialog-title small{letter-spacing:.14em;font-size:.68rem;opacity:.8}
#calculator .tabs{margin:.8rem .8rem 0;border-radius:14px}
#calculatorBody{padding:1rem 1.1rem 1.3rem;overflow:auto;max-height:62vh}
.tool label{display:block;font-size:.85rem;color:var(--muted);margin-top:.5rem}
.tool input,.tool select{font:inherit;width:100%;border:1px solid var(--border);border-radius:12px;padding:.5rem .7rem;background:#fff}
.tool .two{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
.tool .out{margin-top:.8rem;background:var(--soft);border-radius:12px;padding:.7rem .9rem;font-weight:600}
.kbclose{position:fixed;right:12px;z-index:1000;border-radius:999px;background:var(--blue);color:#fff;border:0;padding:.45rem .9rem;font-weight:700;display:none}
/* ---------- desktop ---------- */
@media (min-width:900px){
 #sidebar{transform:none}.shell{margin-left:var(--side)}#menuBtn{display:none}#scrim{display:none!important}
 main{padding:1.8rem 2rem 3rem}
 .grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}
 .learn{grid-template-columns:210px 1fr;align-items:start}
 .learn-nav{flex-direction:column;position:sticky;top:5rem}
}
@media (min-width:600px) and (max-width:899px){.grid.cols-2,.grid.cols-3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.header-actions .lbl{display:none}.header-actions .secondary{padding:.4rem .7rem;font-size:1rem}}
/* ---------- print ---------- */
@media print{#sidebar,header,footer,.studio-foot,.tabs,.qnav,#frameBanner,.no-print{display:none!important}.shell{margin:0}main{max-width:none;padding:0}.card{box-shadow:none}}

/* ---------- revision additions ---------- */
table.mini.facts{width:100%}table.mini.facts td:first-child{width:34%;background:#f6f9f8}
.packtable{width:100%;border-collapse:collapse}.packtable td{padding:.45rem .4rem;border-top:1px solid var(--border)}
.packtable tr:first-child td{border-top:0}.packtable td:nth-child(n+2){width:4.5rem;text-align:center}
.prose ol li,.prose ul li{margin:.25rem 0}
/* ---------- sign in & administrator ---------- */
.side-user{border-top:1px solid rgba(255,255,255,.15);margin-top:auto;padding-top:.6rem}
.side-user + .side-foot{margin-top:0;border-top:0}
.side-user .who{font-family:var(--head);font-weight:700;color:#fff;font-size:.9rem;padding:.2rem .7rem .3rem}
.side-user .side-button{font-size:.85rem;padding:.4rem .7rem}
.auth-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(160deg,var(--paper) 0%,#e4ece9 100%)}
.auth-wrap{width:100%;max-width:440px;padding:2rem 1rem;margin:0}
.auth-brand{display:flex;gap:.7rem;align-items:center;color:var(--ink);text-decoration:none;font-family:var(--head);font-weight:800;font-size:1.02rem;margin-bottom:1.2rem}
.auth-brand small{display:block;font-family:var(--body);font-weight:500;font-size:.66rem;letter-spacing:.14em;color:var(--muted)}
.auth-brand .brand-symbol{background:var(--blue);color:#fff}
.auth-brand.small{font-size:.92rem;margin:0}.auth-brand.small .brand-symbol{flex-basis:36px;height:36px;font-size:1.1rem;border-radius:10px}
.auth-card{padding:1.6rem 1.4rem}.auth-card h1{font-size:1.6rem;margin:.3rem 0 .6rem}
.auth-form,.admin-add{display:grid;gap:.8rem;margin-top:1rem}
.auth-form label,.admin-add label{display:grid;gap:.3rem;font-weight:600;font-size:.9rem}
.auth-form input,.admin-add input,.admin-search{font:inherit;font-weight:400;border:1px solid var(--border);border-radius:12px;padding:.6rem .8rem;background:#fff;width:100%}
.auth-form input:focus,.admin-add input:focus,.admin-search:focus{outline:2px solid #9cc0b0;border-color:transparent}
.auth-form .primary{margin-top:.3rem;padding:.75rem 1rem}.auth-form .ghost{text-align:center;text-decoration:none}
.auth-error{color:var(--bad);background:#fbeeee;border-radius:12px;padding:.6rem .8rem;font-size:.9rem;margin:.8rem 0 0}
.auth-foot{color:var(--muted);font-size:.85rem;text-align:center;margin-top:1rem}
.admin-page header .secondary{text-decoration:none;font-size:.82rem;padding:.45rem .7rem}
.admin-page #breadcrumb{flex:1}
.admin-add select,.class-select{font:inherit;font-weight:400;border:1px solid var(--border);border-radius:12px;padding:.6rem .8rem;background:#fff;width:100%}
.class-warning{background:#fff4e0;border:1px solid #f0c987;border-radius:12px;padding:.6rem .8rem;margin:.8rem 0 0}
.admin-table .class-select.unplaced{border-color:#e0a040;background:#fff4e0}
.admin-table .class-select{padding:.3rem .5rem;font-size:.9rem;min-width:9rem}
@media (min-width:720px){.admin-add{grid-template-columns:1fr 1fr auto auto;align-items:end}}
.admin-search{max-width:240px}
.issued{margin-top:1rem;border:1px solid #bcd6c6;background:#f1f8f3;border-radius:14px;padding:1rem 1.1rem}
.issued dl{display:grid;grid-template-columns:auto 1fr;gap:.3rem 1rem;margin:.6rem 0}.issued dt{color:var(--muted);font-size:.88rem}.issued dd{margin:0;font-weight:600;word-break:break-all}
.issued code,.admin-table code{font-size:1rem;background:#fff;border:1px solid var(--border);border-radius:8px;padding:.05rem .4rem}
.admin-list{overflow-x:auto;margin-top:.8rem}
.admin-table{width:100%}.admin-table td{vertical-align:middle;font-size:.92rem}
.admin-table .actions{white-space:nowrap;text-align:right}
.pill.pending{background:#fff3e4;color:var(--accent)}
.ghost.danger{color:var(--bad)}
@media (max-width:640px){.admin-page header{flex-wrap:wrap}.admin-page .auth-brand.small span small{display:none}}
.book-form{display:grid;gap:.8rem;margin-top:1rem}
@media (min-width:720px){.book-form{grid-template-columns:repeat(3,1fr)}.book-form .wide{grid-column:1/-1}}
.book-form label{display:grid;gap:.3rem;font-weight:600;font-size:.9rem}
.book-form input,.book-form select,.book-form textarea{font:inherit;font-weight:400;border:1px solid var(--border);border-radius:12px;padding:.6rem .8rem;background:#fff;width:100%}
.visually-hidden{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.lesson{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;align-items:center;border-top:1px solid var(--border);padding:.8rem 0}
.lesson-when{font-family:var(--head);font-weight:700}.lesson.cancelled{opacity:.6}
.join{text-decoration:none}.pill.cancelled{background:#fbeeee;color:var(--bad)}.pill.done{background:#eef1f3;color:var(--muted)}

/* ---------- MYP Mathematics curriculum hub ---------- */
.btn{text-decoration:none;display:inline-block}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:.8rem}.crumbs a{color:var(--blue)}
.year-card,.unit-card{display:flex;flex-direction:column;gap:.55rem}.year-card h3,.unit-card h3{margin:0;font-size:1.08rem}
.year-card .row,.unit-card .row:last-child{margin-top:auto}
.unit-card.coming-soon{background:#fbfcfb}.unit-card.live{border-color:#b9d3c3;box-shadow:0 0 0 2px #e3f1e8,var(--shadow)}
.tags{display:flex;flex-wrap:wrap;gap:.3rem}
.tag{font-size:.75rem;padding:.15rem .55rem;border-radius:999px;background:#fff;border:1px solid var(--border);color:var(--ink);text-decoration:none}
.tag.strand{background:var(--soft);border-color:transparent;color:var(--blue)}
a.tag:hover{border-color:var(--blue)}
.pill.live{background:#e3f1e8;color:var(--ok)}.pill.soon{background:#fbeedf;color:#a65a1c}
.sub{color:var(--muted);font-weight:500}
.live-banner{display:flex;gap:1rem;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:1rem;border-color:#b9d3c3;background:#f4faf6}
.live-banner>div{flex:1 1 320px}
.filters{display:grid;gap:.7rem;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));align-items:end}
.filters label{display:grid;gap:.25rem;font-size:.82rem;font-weight:600;color:var(--muted)}
.filters input,.filters select{font:inherit;color:var(--ink);border:1px solid var(--border);border-radius:12px;padding:.5rem .7rem;background:#fff;width:100%}
.filters input:focus,.filters select:focus{outline:2px solid #9cc0b0}
.link-card{text-decoration:none;color:inherit}.link-card:hover{border-color:var(--blue)}
details.fold{margin-top:1rem;padding:0}details.fold summary{cursor:pointer;list-style:none;padding:1rem 1.2rem;display:flex;align-items:center;gap:.5rem}
details.fold summary::-webkit-details-marker{display:none}
details.fold summary::before{content:"▸";color:var(--green);font-weight:800}details.fold[open] summary::before{content:"▾"}
details.fold summary h2{margin:0;font-size:1.12rem}
.fold-body{padding:0 1.2rem 1.2rem}.fold-body h3{font-size:1rem;margin:1rem 0 .3rem}.fold-body ul{margin:.3rem 0;padding-left:1.2rem}
dl.facts{display:grid;grid-template-columns:minmax(8rem,13rem) 1fr;gap:.35rem .9rem;margin:.6rem 0}
dl.facts dt{font-weight:700;color:var(--muted);font-size:.88rem}dl.facts dd{margin:0}
.placeholder{display:inline-block;font-size:.85rem;color:#8a6a2e;background:#fff8ea;border:1px dashed #e8cf9c;border-radius:10px;padding:.15rem .6rem;margin:.2rem 0}
.level{display:flex;flex-direction:column;gap:.3rem;padding:1rem}.level p{margin:0}.level .level-tag{align-self:flex-start}
.wedo{font-size:.8rem;letter-spacing:.06em;color:var(--blue)}
.crit h3{display:flex;gap:.5rem;align-items:center}.crit h4{font-size:.9rem;margin:.8rem 0 .2rem}.crit ul{margin:.2rem 0;padding-left:1.2rem}
.crit-badge{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--blue);color:#fff;font:800 1rem var(--head);flex:0 0 32px}
.crit-badge.sm{width:26px;height:26px;font-size:.85rem}
.reflect{display:grid;gap:.3rem;margin:.6rem 0}.reflect textarea{min-height:80px}
.strand-grid{border-collapse:collapse;min-width:820px;font-size:.85rem}
.strand-grid th,.strand-grid td{border:1px solid var(--border);padding:.5rem;vertical-align:top;text-align:left}
.strand-grid thead th{background:var(--soft);font-family:var(--head)}.strand-grid tbody th{width:180px;font-weight:500}
.strand-grid td a{display:block;margin:.15rem 0}
.pm{display:grid;gap:.6rem;grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
.pm-col{display:flex;flex-direction:column;gap:.4rem;border-left:3px solid var(--soft);padding-left:.6rem}
.pm-year{font:700 .82rem var(--head);color:var(--blue)}
.pm-unit{display:block;text-decoration:none;color:var(--ink);font-size:.86rem;padding:.4rem .55rem;border-radius:10px;border:1px solid var(--border);background:#fff}
.pm-role{display:block;font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;font-weight:800}
.r-introduced{border-color:#b9d3c3;background:#f4faf6}.r-introduced .pm-role{color:var(--ok)}
.r-developed{border-color:#c5d5df;background:#f3f7fa}.r-developed .pm-role{color:var(--blue)}
.r-revisited{border-color:#ecd2b5;background:#fdf6ee}.r-revisited .pm-role{color:#a65a1c}
.r-extended{border-color:#dfc6da;background:#f9f2f8}.r-extended .pm-role{color:#7a3a6b}
.legend{display:flex;gap:.4rem;flex-wrap:wrap}.legend .pm-unit{font-size:.75rem;font-weight:700;padding:.2rem .6rem}
.conn li{margin:.2rem 0}
@media (max-width:560px){dl.facts{grid-template-columns:1fr}dl.facts dd{margin-bottom:.4rem}}
.lesson-table tr.cancelled td{opacity:.6}.lesson-table td .meta{font-size:.82rem;margin-top:.15rem}
.lesson-table .actions .join{margin-right:.4rem;padding:.4rem .7rem;font-size:.85rem}
.admin-page #students,.admin-page #lessons{scroll-margin-top:5rem}
/* ---------- examinations ---------- */
.btn.primary,.btn.secondary{text-decoration:none}
.ok-note{color:var(--ok);font-weight:600}
.exam-gate{max-width:760px;margin:0 auto}.exam-gate h1{font-size:clamp(1.5rem,5vw,2.1rem);margin:.3rem 0 .6rem}
.code-input{font:800 1.4rem var(--head)!important;letter-spacing:.18em;text-transform:uppercase;max-width:16rem}
.exam-start{font-size:1.1rem;padding:.85rem 1.6rem}
.code-big{font:800 2.4rem var(--head);letter-spacing:.16em;color:var(--blue);margin:.4rem 0}
.exam-head{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;align-items:flex-start}.exam-head h1{font-size:1.5rem;margin:.2rem 0 .4rem}
.exam-head .meta{margin-left:.4rem}
.book-form .check{display:flex;gap:.5rem;align-items:flex-start;font-weight:500;grid-column:span 1}.book-form .check input{width:auto;margin-top:.35rem}
@media (min-width:720px){.book-form .check{grid-column:span 1}}
.qedit{border:1px solid var(--border);border-radius:14px;padding:.8rem;margin-top:.8rem;display:grid;gap:.5rem;background:#fbfcfb}
.qedit label{display:grid;gap:.25rem;font-size:.85rem;font-weight:600}
.qedit textarea{font:inherit;font-weight:400;border:1px solid var(--border);border-radius:12px;padding:.5rem .7rem;width:100%;resize:vertical}
.qpreview:empty{display:none}.qpreview{background:#fff;border:1px dashed var(--border);border-radius:12px;padding:.5rem .8rem}
.crit-pick{border:0;display:flex;gap:.6rem;align-items:center;padding:0;margin:0}.crit-pick legend{font-size:.85rem;font-weight:600;float:left;margin-right:.4rem}
.crit-pick label{display:flex;gap:.25rem;align-items:center;font-weight:700}
.stu-list{max-height:380px;overflow:auto;border:1px solid var(--border);border-radius:12px;margin:.6rem 0;padding:.3rem .6rem}
.stu{display:flex;gap:.6rem;align-items:center;padding:.35rem 0;border-top:1px solid var(--border)}.stu:first-child{border-top:0}
.stu.via-class{opacity:.75}
.admin-table.mon td{font-size:.88rem}.admin-table.mon .actions{white-space:normal;min-width:15rem}.admin-table.mon .pill{white-space:nowrap}.live-left{font:700 1rem var(--head)}.live-left.bad{color:var(--bad)}
.wide-dialog{width:min(900px,96vw)}
.exam-dialog-body{padding:1rem 1.1rem 1.3rem;overflow:auto;max-height:76vh;display:grid;gap:.8rem}
.exam-readonly{background:#fbfcfb;border:1px solid var(--border);border-radius:12px;padding:.6rem .9rem}
.exam-steps{margin:.2rem 0;padding-left:1.4rem}.exam-steps li{margin:.25rem 0;font-size:1.05rem}
.exam-text{white-space:normal;margin-top:.3rem}
.late-copy{background:#fff4e0;border:1px solid #f0c987;border-radius:12px;padding:.6rem .9rem}
/* the workspace: only examination controls on screen */
body.exam-mode #pageHeader,body.exam-mode #pageFooter{display:none}
body.exam-mode main{max-width:none;padding:0}
body.exam-mode{background:#eef2ef}
.exam-shell{min-height:100vh;display:flex;flex-direction:column}
.exam-bar{position:sticky;top:0;z-index:30;display:flex;gap:.8rem;align-items:center;flex-wrap:wrap;padding:.6rem 1rem;background:#fff;border-bottom:1px solid var(--border)}
.exam-title{display:flex;flex-direction:column;line-height:1.25;flex:1 1 200px;min-width:0}.exam-title b{font-family:var(--head);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.exam-progress{display:grid;gap:.2rem;font-size:.82rem;color:var(--muted);min-width:9rem}
.save-state{font-size:.82rem;color:var(--ok);font-weight:600}.save-state.pending{color:var(--accent)}.save-state.bad{color:var(--bad)}
.exam-banner{padding:.6rem 1rem;background:#eef4f7;border-bottom:1px solid var(--border);font-weight:600;display:flex;gap:.8rem;align-items:center;flex-wrap:wrap}
.exam-banner.warn{background:#fff4e0;border-color:#f0c987}.exam-banner.bad{background:#fbeeee;color:var(--bad)}
.exam-body{flex:1;display:grid;grid-template-columns:1fr;gap:1rem;padding:1rem}
.exam-nav{display:flex;gap:.35rem;flex-wrap:wrap;align-content:flex-start}
.exam-nav button{min-width:40px;height:40px;border-radius:10px;border:1px solid var(--border);background:#fff;font-weight:700;color:var(--ink);padding:0 .5rem}
.exam-nav button.answered{background:#e3f1e8;border-color:#b9d3c3;color:var(--ok)}
.exam-nav button.active{background:var(--blue);border-color:var(--blue);color:#fff}
.exam-nav button.review{font-weight:600;font-size:.85rem}
.exam-paper{display:flex;flex-direction:column;gap:.3rem}.exam-paper iframe{width:100%;height:70vh;border:1px solid var(--border);border-radius:12px;background:#fff}
.paper-alt{margin:0}
.exam-shell.paper-hidden .exam-paper{display:none}
.exam-main{min-width:0}.exam-q{display:grid;gap:.8rem}
.review-list{display:grid;gap:.5rem}
.review-item{display:grid;grid-template-columns:auto auto auto 1fr;gap:.3rem .8rem;align-items:center;text-align:left;background:#fff;border:1px solid var(--border);border-radius:12px;padding:.6rem .8rem;color:var(--ink)}
.review-item:hover{border-color:var(--blue)}.review-item .rq{font-weight:700}.review-item .rp{grid-column:1/-1;font-size:.9rem}.review-item .rp:empty{display:none}
.exam-overlay{position:fixed;inset:0;z-index:70;background:rgba(20,35,45,.72);display:grid;place-items:center;padding:1rem}
.exam-overlay[hidden]{display:none}.exam-overlay .card{max-width:520px;text-align:center}
#confirmSubmit{width:min(480px,94vw)}
@media (min-width:900px){
 .exam-body{grid-template-columns:64px minmax(0,1fr)}
 .exam-nav{flex-direction:column;position:sticky;top:5rem;align-self:start}
 .exam-shell.with-paper .exam-body{grid-template-columns:64px minmax(0,1fr) minmax(0,1fr)}
 .exam-shell.with-paper.paper-hidden .exam-body{grid-template-columns:64px minmax(0,1fr)}
 .exam-paper{position:sticky;top:5rem;align-self:start}.exam-paper iframe{height:calc(100vh - 8rem)}
}
/* Typing tools above question / mark-scheme / instruction boxes (MathUI.textTools). */
.qfield{display:grid;gap:0}
.qfield .qlabel{font-size:.85rem;font-weight:600;margin-bottom:.25rem}
.qtools{display:flex;flex-wrap:wrap;gap:.25rem;align-items:center;padding:.35rem;border:1px solid var(--border);border-bottom:0;border-radius:12px 12px 0 0;background:#f3f7f6}
.qtools + textarea{border-top-left-radius:0!important;border-top-right-radius:0!important}
.qtools button{border:1px solid var(--border);background:#fff;border-radius:8px;min-width:34px;height:32px;padding:0 .45rem;font-size:.9rem;line-height:1;cursor:pointer;color:inherit}
.qtools button:hover{background:#e7f1ee}
.qtools button.eq{font-weight:700;background:#24495a;color:#fff;border-color:#24495a}
.qtools .sep{width:1px;height:22px;background:var(--border);margin:0 .2rem}
label.wide .qtools{margin-top:.25rem}
.qpreview .kicker{display:block;margin-bottom:.2rem}
.eq-dialog{border:0;border-radius:18px;padding:0;width:min(640px,94vw);box-shadow:0 20px 60px rgba(0,0,0,.25)}
.eq-dialog .eq-body{padding:1rem 1.2rem 1.2rem;display:grid;gap:.7rem}
.eq-dialog math-field{display:block;width:100%;font-size:1.5rem;padding:.5rem .7rem;border:1px solid var(--border);border-radius:12px;min-height:3rem}
.symbar button.eq{font-weight:700;background:#24495a;color:#fff;border-color:#24495a}
.sol-dialog{width:min(820px,96vw)}
.sol-groups{display:flex;gap:.3rem;flex-wrap:wrap}
.sol-groups button{border:1px solid var(--border);background:#fff;border-radius:99px;padding:.25rem .75rem;font-size:.85rem;cursor:pointer}
.sol-groups button.on{background:#24495a;color:#fff;border-color:#24495a}
.sol-pal{display:flex;gap:.3rem;flex-wrap:wrap}
.sol-pal button{border:1px solid var(--border);background:#fff;border-radius:8px;min-width:44px;height:40px;padding:0 .4rem;cursor:pointer;font-size:1rem}
.sol-pal button:hover{background:#e7f1ee}
.sol-lines{display:grid;gap:.4rem;max-height:46vh;overflow-y:auto;padding:.1rem}
.sol-lines math-field{font-size:1.3rem;min-height:2.6rem;flex:1}