/* Maths Lab — original lesson styles, scoped to .mlab and mapped to the EduHub palette */
.mlab [hidden]{display:none!important}
.mlab{
  
  --ink:#0A1020; --indigo-950:#0E1A3A; --indigo-900:#142454; --indigo-800:#18306B; --indigo-500:#2B49A0; --indigo-400:#3D5DC2;
  --brass-700:#8C6324; --brass-500:#BD8B41; --brass-400:#D2A463; --brass-300:#E2BD86;
  
  --bg:#F6F3EC; --bg-deep:#EEE7D6; --surface:#FFFFFF; --surface-2:#FAF8F3; --tint:#E8ECFA;
  --line:#E1D9C6; --line-cool:#D9DEEB;
  --fg:#161E36; --fg-soft:#4B5470; --fg-mute:#7A849E;
  --accent:#18306B; --accent-hover:#1C3170; --accent-ink:#1C3170; --on-accent:#FFFFFF;
  --brass:#BD8B41; --brass-ink:#8C6324; --brass-bg:#F5E9D3;
  --good:#2F6B4D; --good-bg:#DEEAE2; --bad:#A84327; --bad-bg:#F6E2DB;
  --shadow-sm:0 1px 3px rgba(10,16,32,.08); --shadow-md:0 6px 20px rgba(10,16,32,.10); --shadow-lg:0 16px 48px rgba(10,16,32,.18);
  --f-display:'Fraunces',Georgia,'Times New Roman',serif; --f-body:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',sans-serif; --f-mono:'IBM Plex Mono',ui-monospace,'Courier New',monospace;
  --nav-h:72px; --max-w:1180px; --r-sm:4px; --r-md:8px; --r-lg:16px; --r-pill:999px;
  --ease:cubic-bezier(0.22,0.61,0.36,1);
}
.mlab mjx-container{color:inherit}
.mlab mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden;max-width:100%;padding:2px 0}
.mlab .hero-rule{height:3px;background:linear-gradient(90deg,var(--brass-700),var(--brass-400),var(--brass-700))}
.mlab .hero{position:relative;background:radial-gradient(120% 140% at 14% -10%,#1B2E66 0%,var(--indigo-950) 45%,var(--ink) 100%);overflow:hidden;color:#fff}
.mlab .hero-grid-bg{position:absolute;inset:0;opacity:.07;background-image:linear-gradient(rgba(255,255,255,.9) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.9) 1px,transparent 1px);background-size:32px 32px;pointer-events:none}
.mlab .hero-inner{max-width:var(--max-w);margin:0 auto;padding:64px 28px 58px;position:relative;z-index:2;display:grid;grid-template-columns:1.3fr .9fr;gap:52px;align-items:start}
.mlab .crumbs{font-size:.7rem;color:rgba(255,255,255,.45);margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap}
.mlab .crumbs a{color:rgba(255,255,255,.6);text-decoration:none}
.mlab .crumbs a:hover{color:var(--brass-300)}
.mlab .hero-eyebrow{display:inline-flex;align-items:center;gap:9px;background:rgba(189,139,65,.14);border:1px solid rgba(189,139,65,.36);border-radius:var(--r-pill);padding:6px 16px;font-size:.66rem;font-weight:700;color:var(--brass-300);letter-spacing:.1em;text-transform:uppercase;margin-bottom:22px}
.mlab .hero-h1{font-family:var(--f-display);color:#fff;line-height:1.05;letter-spacing:-.015em;font-weight:500;font-size:clamp(2.3rem,5vw,3.9rem);margin-bottom:20px;text-wrap:balance}
.mlab .hero-h1 .it{font-style:italic;color:var(--brass-300)}
.mlab .hero-lede{color:rgba(255,255,255,.7);font-size:1.04rem;line-height:1.75;max-width:540px;margin-bottom:26px}
.mlab .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.mlab .btn{display:inline-flex;align-items:center;gap:8px;font-size:.86rem;font-weight:700;padding:12px 20px;border-radius:var(--r-md);text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .15s,background .15s;line-height:1.2}
.mlab .btn:hover{transform:translateY(-1px)}
.mlab .btn-brass{background:var(--brass-400);color:var(--ink)}
.mlab .btn-brass:hover{background:var(--brass-300)}
.mlab .btn-ghost{border-color:rgba(255,255,255,.25);color:#fff;background:transparent}
.mlab .btn-ghost:hover{background:rgba(255,255,255,.08)}
.mlab .countdown{margin-top:26px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:.78rem;color:rgba(255,255,255,.6)}
.mlab .countdown label{font-weight:600}
.mlab .countdown input{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.2);border-radius:var(--r-pill);color:#fff;font-family:var(--f-mono);font-size:.75rem;padding:5px 12px;color-scheme:dark}
.mlab .countdown output{font-family:var(--f-mono);color:var(--brass-300);font-weight:600}
.mlab .route-card{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.13);border-radius:var(--r-lg);padding:22px 20px 16px;box-shadow:var(--shadow-lg)}
.mlab .route-top{display:flex;align-items:baseline;justify-content:space-between;gap:8px;margin-bottom:4px}
.mlab .route-top h2{font-family:var(--f-display);font-style:italic;font-weight:500;font-size:1.15rem;color:#fff}
.mlab .route-top span{font-family:var(--f-mono);font-size:.62rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--brass-300)}
.mlab .route-sub{font-size:.74rem;color:rgba(255,255,255,.45);margin-bottom:6px}
.mlab .route-list{position:relative;list-style:none}
.mlab .route-list::before{content:'';position:absolute;left:17px;top:14px;bottom:14px;width:1.5px;background:linear-gradient(180deg,rgba(226,189,134,.6),rgba(226,189,134,.08))}
.mlab .route-stop a{display:flex;align-items:center;gap:14px;padding:11px 6px;text-decoration:none;border-radius:var(--r-md);transition:background .15s,transform .15s}
.mlab .route-stop a:hover{background:rgba(255,255,255,.07);transform:translateX(3px)}
.mlab .route-node{position:relative;z-index:2;width:24px;height:24px;flex-shrink:0;border-radius:50%;background:var(--indigo-950);border:1.5px solid var(--brass-400);display:flex;align-items:center;justify-content:center;font-family:var(--f-mono);font-size:.62rem;font-weight:700;color:var(--brass-300);margin-left:5px}
.mlab .route-txt b{display:block;color:#fff;font-size:.86rem;font-weight:600}
.mlab .route-txt small{color:rgba(255,255,255,.48);font-size:.72rem}
.mlab .stat-band{background:var(--indigo-900);border-top:1px solid rgba(255,255,255,.06)}
.mlab .stat-band-inner{max-width:var(--max-w);margin:0 auto;padding:24px 28px;display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.mlab .stat-cell{border-left:2px solid var(--brass-500);padding-left:16px}
.mlab .stat-num{font-family:var(--f-mono);font-size:1.8rem;font-weight:600;color:#fff;line-height:1.1;font-variant-numeric:tabular-nums}
.mlab .stat-num em{color:var(--brass-300);font-style:normal}
.mlab .stat-cap{font-size:.64rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.5)}
.mlab .wrap{max-width:var(--max-w);margin:0 auto;padding-inline:28px}
.mlab .sec-pad{padding-block:72px}
.mlab .alt-band{background:var(--bg-deep)}
.mlab .sec-eyebrow{display:flex;align-items:center;gap:11px;margin-bottom:12px}
.mlab .sec-eyebrow .bar{width:28px;height:2px;background:var(--brass)}
.mlab .sec-eyebrow span{font-size:.66rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-ink)}
.mlab .sec-title{font-family:var(--f-display);font-weight:500;letter-spacing:-.015em;line-height:1.12;font-size:clamp(1.8rem,3.4vw,2.6rem);text-wrap:balance}
.mlab .sec-title .it{font-style:italic;color:var(--accent-ink)}
.mlab .sec-intro{color:var(--fg-soft);font-size:1rem;line-height:1.7;max-width:62ch;margin-top:12px}
.mlab .sec-head{margin-bottom:34px}
.mlab .mono{font-family:var(--f-mono)}
.mlab .howto{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.mlab .howto div{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:20px}
.mlab .howto b{display:block;font-family:var(--f-display);font-size:1.12rem;font-weight:500;margin-bottom:6px}
.mlab .howto p{font-size:.86rem;color:var(--fg-soft)}
.mlab .howto .k{font-family:var(--f-mono);font-size:.64rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--brass-ink);display:block;margin-bottom:10px}
.mlab .gap-shell{display:grid;grid-template-columns:.85fr 1.15fr;gap:40px;align-items:start}
.mlab .gap-card{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);box-shadow:var(--shadow-md);padding:26px;min-width:0}
.mlab .gap-meta{display:flex;justify-content:space-between;align-items:center;font-size:.72rem;color:var(--fg-mute);font-weight:600;letter-spacing:.06em;text-transform:uppercase;margin-bottom:10px}
.mlab .gap-bar{height:6px;background:var(--line-cool);border-radius:var(--r-pill);overflow:hidden;margin-bottom:20px}
.mlab .gap-bar i{display:block;height:100%;background:var(--brass);width:0;transition:width .3s var(--ease)}
.mlab .gap-q{font-size:1.08rem;font-weight:600;margin-bottom:16px;line-height:1.5}
.mlab .gap-result h3{font-family:var(--f-display);font-weight:500;font-size:1.5rem;margin-bottom:8px}
.mlab .gap-result ul{list-style:none;display:grid;gap:8px;margin:14px 0}
.mlab .gap-result li a{display:flex;justify-content:space-between;gap:10px;padding:10px 14px;border:1px solid var(--line-cool);border-radius:var(--r-md);text-decoration:none;font-size:.88rem;font-weight:600;background:var(--surface-2)}
.mlab .gap-result li a:hover{border-color:var(--brass)}
.mlab .gap-side ul{list-style:none;display:grid;gap:12px;margin-top:20px}
.mlab .gap-side li{display:flex;gap:12px;font-size:.92rem;color:var(--fg-soft)}
.mlab .gap-side li b{color:var(--fg)}
.mlab .gap-side .dot{width:8px;height:8px;border-radius:50%;background:var(--brass);margin-top:9px;flex-shrink:0}
.mlab .opts{display:grid;gap:9px}
.mlab .opt{display:block;width:100%;text-align:left;background:var(--surface-2);border:1.5px solid var(--line-cool);border-radius:var(--r-md);padding:11px 14px;font-size:.92rem;color:var(--fg);cursor:pointer;transition:border-color .12s,background .12s;line-height:1.45}
.mlab .opt:hover:not(:disabled){border-color:var(--accent-ink)}
.mlab .opt:disabled{cursor:default}
.mlab .opt.right{border-color:var(--good);background:var(--good-bg)}
.mlab .opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.mlab .why{margin-top:12px;font-size:.88rem;color:var(--fg-soft);background:var(--surface-2);border-left:3px solid var(--brass);padding:10px 14px;border-radius:0 var(--r-md) var(--r-md) 0}
.mlab .why b{color:var(--fg)}
.mlab .found-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.mlab .fcard{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:22px;min-width:0;scroll-margin-top:calc(var(--nav-h) + 16px)}
.mlab .fcard h3{font-family:var(--f-display);font-weight:500;font-size:1.25rem;margin-bottom:4px;display:flex;align-items:baseline;gap:10px}
.mlab .fcard h3 .tag{font-family:var(--f-mono);font-size:.6rem;font-weight:600;letter-spacing:.1em;color:var(--brass-ink);text-transform:uppercase}
.mlab .fcard .lead{font-size:.9rem;color:var(--fg-soft);margin-bottom:12px}
.mlab .fcard ul{padding-left:18px;font-size:.9rem;display:grid;gap:5px}
.mlab .fcard .eg{margin-top:12px;font-size:.88rem;background:var(--surface-2);border:1px dashed var(--line);border-radius:var(--r-md);padding:10px 12px}
.mlab .hook{background:var(--brass-bg);border:1px solid color-mix(in srgb,var(--brass) 45%,transparent);border-radius:var(--r-md);padding:12px 14px;font-size:.88rem;margin-top:12px}
.mlab .hook::before{content:'Remember it like this';display:block;font-family:var(--f-mono);font-size:.62rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--brass-ink);margin-bottom:4px}
.mlab .trap{display:grid;gap:10px}
.mlab .trap li{list-style:none;background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:12px 14px;font-size:.9rem}
.mlab .trap .no{color:var(--bad);font-weight:700}
.mlab .trap .yes{color:var(--good);font-weight:700}
.mlab .map-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.mlab .map-col{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:22px;min-width:0}
.mlab .map-col h3{font-family:var(--f-display);font-weight:500;font-size:1.3rem;display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:14px}
.mlab .map-col h3 span{font-family:var(--f-mono);font-size:.72rem;color:var(--fg-mute);font-weight:500}
.mlab .map-row{display:grid;grid-template-columns:minmax(0,1fr) 46px;gap:10px;align-items:center;text-decoration:none;padding:7px 0;border-bottom:1px solid var(--line-cool)}
.mlab .map-row:last-child{border-bottom:none}
.mlab .map-row .lbl{font-size:.86rem;font-weight:600;display:flex;justify-content:space-between;gap:8px}
.mlab .map-row .lbl small{font-weight:600;font-size:.66rem;letter-spacing:.06em;text-transform:uppercase}
.mlab .map-row .track{grid-column:1/2;height:8px;background:var(--line-cool);border-radius:var(--r-pill);overflow:hidden;margin-top:6px}
.mlab .map-row .track i{display:block;height:100%;background:var(--accent)}
.mlab .map-row .val{font-family:var(--f-mono);font-size:.82rem;font-weight:600;text-align:right;font-variant-numeric:tabular-nums;grid-row:1/3;grid-column:2}
.mlab .map-row:hover .lbl span{color:var(--accent-ink);text-decoration:underline}
.mlab .st{color:var(--fg-mute)}
.mlab .st.doing{color:var(--brass-ink)}
.mlab .st.done{color:var(--good)}
.mlab .map-note{font-size:.78rem;color:var(--fg-mute);margin-top:14px}
.mlab .paper-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:26px}
.mlab .topic{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);margin-bottom:16px;scroll-margin-top:calc(var(--nav-h) + 12px);transition:opacity .25s,box-shadow .2s}
.mlab .topic.is-open{box-shadow:var(--shadow-md);border-color:color-mix(in srgb,var(--accent-ink) 30%,var(--line-cool))}
.mlab .topic-head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:18px;align-items:center;width:100%;background:none;border:0;text-align:left;padding:20px 22px;cursor:pointer;color:var(--fg)}
.mlab .topic-num{width:46px;height:46px;border-radius:50%;border:1.5px solid var(--brass);display:flex;align-items:center;justify-content:center;font-family:var(--f-mono);font-weight:600;font-size:.86rem;color:var(--brass-ink);flex-shrink:0}
.mlab .topic.is-done .topic-num{background:var(--good);border-color:var(--good);color:var(--surface)}
.mlab .topic-title{font-family:var(--f-display);font-size:1.32rem;font-weight:500;line-height:1.2;display:block}
.mlab .topic-meta{font-size:.74rem;color:var(--fg-mute);font-weight:600;letter-spacing:.04em;display:flex;gap:12px;flex-wrap:wrap;margin-top:4px}
.mlab .topic-big{font-size:.9rem;color:var(--fg-soft);margin-top:6px;display:block;max-width:70ch}
.mlab .topic-chev{width:34px;height:34px;border-radius:50%;border:1px solid var(--line-cool);display:flex;align-items:center;justify-content:center;transition:transform .2s;color:var(--fg-soft);font-size:.9rem}
.mlab .topic.is-open .topic-chev{transform:rotate(180deg)}
.mlab .topic-body{padding:0 22px 22px}
.mlab .tabs{display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid var(--line-cool);margin-bottom:20px}
.mlab .tab{background:none;border:0;border-bottom:2px solid transparent;padding:10px 12px;font-size:.82rem;font-weight:700;color:var(--fg-mute);cursor:pointer;margin-bottom:-1px}
.mlab .tab[aria-selected="true"]{color:var(--accent-ink);border-bottom-color:var(--brass)}
.mlab .tab:hover{color:var(--fg)}
.mlab .panel{max-width:820px}
.mlab .panel>p,.mlab .panel>ul,.mlab .panel>ol{font-size:.95rem;margin-bottom:12px}
.mlab .panel ul,.mlab .panel ol{padding-left:20px}
.mlab .panel h4{font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink);margin:18px 0 8px}
.mlab .big-idea{font-family:var(--f-display);font-size:1.3rem;line-height:1.45;font-weight:400;margin-bottom:14px;text-wrap:pretty}
.mlab .big-idea em{color:var(--brass-ink)}
.mlab .kit{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:12px}
.mlab .kit div{background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:12px 14px;font-size:.9rem;min-width:0;overflow-x:auto}
.mlab .kit div b{display:block;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--fg-mute);margin-bottom:4px}
.mlab .topic-foot{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-top:22px;padding-top:16px;border-top:1px solid var(--line-cool)}
.mlab .topic-foot p{font-size:.84rem;color:var(--fg-soft)}
.mlab .btn-done{background:var(--surface-2);border:1.5px solid var(--good);color:var(--good)}
.mlab .topic.is-done .btn-done{background:var(--good);color:var(--surface)}
.mlab .btn-line{background:var(--surface);border:1px solid var(--line-cool);color:var(--fg)}
.mlab .we{border:1px solid var(--line-cool);border-radius:var(--r-lg);margin-bottom:18px;overflow:hidden;background:var(--surface)}
.mlab .we-top{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:center;background:var(--tint);padding:9px 16px;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink)}
.mlab .we-top .src{font-family:var(--f-mono);font-weight:500;letter-spacing:.02em;text-transform:none}
.mlab .we-q{padding:16px 16px 4px;font-size:.98rem;font-weight:500}
.mlab .we-q .ctx{display:block;font-size:.86rem;color:var(--fg-soft);font-weight:400;margin-bottom:6px}
.mlab .steps{list-style:none;padding:8px 16px 4px;display:grid;gap:10px;counter-reset:st}
.mlab .steps li{counter-increment:st;display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;font-size:.93rem;animation:stepIn .35s var(--ease)}
.mlab .steps li::before{content:counter(st);width:26px;height:26px;border-radius:50%;background:var(--surface-2);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-family:var(--f-mono);font-size:.72rem;font-weight:600;color:var(--brass-ink);margin-top:1px}
.mlab .steps li>div{min-width:0}
.mlab .steps li b{color:var(--fg)}
.mlab .steps .say{display:block;font-size:.84rem;color:var(--fg-mute);font-style:italic;margin-top:2px}
@keyframes stepIn{from{opacity:.2;transform:translateY(6px)}to{opacity:1;transform:none}}
.mlab .we-ans{margin:6px 16px 0;background:var(--good-bg);border-radius:var(--r-md);padding:10px 14px;font-size:.92rem;color:var(--fg)}
.mlab .we-ans b{color:var(--good)}
.mlab .we-ctrl{display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding:14px 16px 16px}
.mlab .we-ctrl .btn{font-size:.8rem;padding:9px 14px}
.mlab .btn-next{background:var(--accent);color:var(--on-accent)}
.mlab .btn-next:hover{background:var(--accent-hover)}
.mlab .btn-next:disabled{opacity:.45;cursor:default;transform:none}
.mlab .try-t{font-family:var(--f-mono);font-size:.78rem;color:var(--brass-ink);font-weight:600}
.mlab .qc{border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:16px;margin-bottom:14px;background:var(--surface)}
.mlab .qc-q{font-weight:600;margin-bottom:12px;font-size:.96rem}
.mlab .qc-q small{display:block;font-family:var(--f-mono);font-size:.66rem;font-weight:500;color:var(--fg-mute);letter-spacing:.06em;margin-bottom:4px;text-transform:uppercase}
.mlab .flips{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-bottom:12px}
.mlab .flip{background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:14px;text-align:left;cursor:pointer;color:var(--fg);font-size:.88rem;min-height:120px;display:flex;flex-direction:column;gap:6px;line-height:1.45}
.mlab .flip .face-b{display:none}
.mlab .flip.on{background:var(--tint);border-color:var(--accent-ink)}
.mlab .flip.on .face-a{display:none}
.mlab .flip.on .face-b{display:block}
.mlab .flip .lbl{font-family:var(--f-mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--brass-ink);font-weight:600}
.mlab .flip code{font-family:var(--f-mono);font-size:.8rem;background:var(--surface);border:1px solid var(--line-cool);padding:1px 6px;border-radius:4px}
.mlab .grapher{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:18px;background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:16px;margin:8px 0 18px}
.mlab .grapher canvas{width:100%;aspect-ratio:1/1;max-width:100%;background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-md);display:block}
.mlab .g-ctrl{display:grid;gap:12px;align-content:start;font-size:.86rem}
.mlab .g-ctrl select,.mlab .g-ctrl input[type=range]{width:100%}
.mlab .g-ctrl input[type=range]{accent-color:var(--accent-ink)}
.mlab .g-ctrl select{font-family:inherit;font-size:.86rem;padding:7px 10px;border:1px solid var(--line-cool);border-radius:var(--r-md);background:var(--surface);color:var(--fg)}
.mlab .g-ctrl label{display:flex;justify-content:space-between;font-weight:600;font-size:.8rem}
.mlab .g-ctrl label output{font-family:var(--f-mono);color:var(--brass-ink)}
.mlab .g-read{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:10px 12px;font-size:.84rem;line-height:1.7}
.mlab .g-read b{font-family:var(--f-mono);font-weight:600}
.mlab .fig{background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:12px;margin:10px 0 14px;overflow-x:auto}
.mlab .fig svg{display:block;max-width:100%;height:auto;margin:0 auto}
.mlab .fig figcaption{font-size:.78rem;color:var(--fg-mute);text-align:center;margin-top:6px}
.mlab .svg-ink{stroke:var(--fg);fill:none}
.mlab .svg-txt{fill:var(--fg);font-family:var(--f-body);font-size:13px}
.mlab .svg-acc{stroke:var(--brass);fill:none}
.mlab .svg-soft{stroke:var(--fg-mute);fill:none}
.mlab .decide{display:grid;gap:10px;margin:8px 0 14px}
.mlab .decide div{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;align-items:center;background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:10px 14px;font-size:.9rem}
.mlab .decide div span:first-child{font-weight:600}
.mlab .fs-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.mlab .fs-col{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);padding:22px;min-width:0}
.mlab .fs-col h3{font-family:var(--f-display);font-weight:500;font-size:1.3rem;margin-bottom:4px}
.mlab .fs-col>p{font-size:.86rem;color:var(--fg-soft);margin-bottom:14px}
.mlab .fs-list{list-style:none;display:grid;gap:0}
.mlab .fs-list li{display:grid;grid-template-columns:minmax(0,130px) minmax(0,1fr);gap:12px;padding:9px 0;border-bottom:1px solid var(--line-cool);font-size:.88rem;align-items:center}
.mlab .fs-list li:last-child{border-bottom:none}
.mlab .fs-list li>span:first-child{font-size:.72rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--fg-mute)}
.mlab .fs-list li>span:last-child{min-width:0;overflow-x:auto}
.mlab .plan-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.mlab .gp{list-style:none;counter-reset:gp;display:grid;gap:12px}
.mlab .gp li{counter-increment:gp;display:grid;grid-template-columns:34px minmax(0,1fr);gap:14px;background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:14px 16px}
.mlab .gp li::before{content:counter(gp);font-family:var(--f-mono);font-weight:600;color:var(--brass-ink);font-size:.9rem;width:30px;height:30px;border:1.5px solid var(--brass);border-radius:50%;display:flex;align-items:center;justify-content:center}
.mlab .gp b{display:block;font-size:.95rem;margin-bottom:2px}
.mlab .gp p{font-size:.86rem;color:var(--fg-soft)}
.mlab .sprint-plan{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-lg);overflow:hidden}
.mlab .sprint-plan h3{font-family:var(--f-display);font-weight:500;font-size:1.25rem;padding:18px 18px 4px}
.mlab .sprint-plan>p{font-size:.84rem;color:var(--fg-soft);padding:0 18px 12px}
.mlab .day{display:grid;grid-template-columns:auto 52px minmax(0,1fr);gap:12px;align-items:center;padding:10px 18px;border-top:1px solid var(--line-cool);font-size:.88rem;cursor:pointer}
.mlab .day input{width:18px;height:18px;accent-color:var(--good)}
.mlab .day .d{font-family:var(--f-mono);font-size:.72rem;font-weight:600;color:var(--fg-mute)}
.mlab .day:has(input:checked) .t{text-decoration:line-through;color:var(--fg-mute)}
.mlab .papers{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-top:20px}
.mlab .papers div{background:var(--surface);border:1px solid var(--line-cool);border-radius:var(--r-md);padding:12px 14px;font-size:.85rem}
.mlab .papers b{display:block;font-family:var(--f-mono);font-size:.78rem;color:var(--accent-ink)}
.mlab .dock{position:fixed;left:0;right:0;bottom:0;z-index:700;background:var(--surface);border-top:1px solid var(--line-cool);box-shadow:0 -8px 24px rgba(10,16,32,.10);padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px))}
.mlab .dock-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:space-between}
.mlab .dock-group{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.mlab .dock-btn{background:var(--surface-2);border:1px solid var(--line-cool);border-radius:var(--r-pill);padding:7px 13px;font-size:.78rem;font-weight:700;color:var(--fg);cursor:pointer;line-height:1.2}
.mlab .dock-btn:hover{border-color:var(--accent-ink)}
.mlab .dock-btn[aria-pressed="true"]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.mlab .timer{font-family:var(--f-mono);font-weight:600;font-size:1rem;min-width:56px;text-align:center;font-variant-numeric:tabular-nums}
.mlab .dock select{font-family:inherit;font-size:.78rem;font-weight:600;border:1px solid var(--line-cool);border-radius:var(--r-pill);padding:6px 10px;background:var(--surface-2);color:var(--fg)}
.mlab .ring{display:flex;align-items:center;gap:8px;font-size:.76rem;font-weight:700;color:var(--fg-soft)}
.mlab .ring svg{width:34px;height:34px}
.mlab .xp{font-family:var(--f-mono);font-weight:600;font-size:.82rem;color:var(--brass-ink)}
.mlab .toast{position:fixed;left:50%;bottom:86px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:var(--r-pill);font-size:.84rem;font-weight:600;z-index:900;box-shadow:var(--shadow-lg);max-width:calc(100% - 32px);text-align:center}
body.focus .mlab .hero,body.focus .mlab .stat-band,body.focus .mlab .util,body.focus .mlab .foot{opacity:.25}
body.focus .mlab .topic:not(.is-open),body.focus .mlab section.dim-in-focus{opacity:.22}
body.focus .mlab .topic:not(.is-open):hover{opacity:.7}
.mlab .modal{position:fixed;inset:0;background:rgba(10,16,32,.6);z-index:1000;display:flex;align-items:center;justify-content:center;padding:16px}
.mlab .modal-box{background:var(--surface);color:var(--fg);border-radius:var(--r-lg);padding:28px;max-width:440px;width:100%;box-shadow:var(--shadow-lg)}
.mlab .modal-box h3{font-family:var(--f-display);font-weight:500;font-size:1.5rem;margin-bottom:8px}
.mlab .modal-box ul{padding-left:18px;margin:12px 0 18px;font-size:.92rem;display:grid;gap:4px}
.mlab .modal-box .row{display:flex;gap:10px;flex-wrap:wrap}
@media (max-width:1040px){.mlab .hero-inner{grid-template-columns:1fr;gap:36px}
.mlab .howto{grid-template-columns:1fr 1fr}
.mlab .gap-shell,.mlab .plan-grid{grid-template-columns:1fr}}
@media (max-width:900px){.mlab .stat-band-inner{grid-template-columns:1fr 1fr}
.mlab .map-grid,.mlab .fs-grid,.mlab .found-grid{grid-template-columns:1fr}
.mlab .grapher{grid-template-columns:1fr}}
@media (max-width:640px){.mlab .sec-pad{padding-block:52px}
.mlab .wrap,.mlab .hero-inner,.mlab .stat-band-inner{padding-left:16px;padding-right:16px}
.mlab .hero-inner{padding-top:40px;padding-bottom:40px}
.mlab .howto,.mlab .kit{grid-template-columns:1fr}
.mlab .topic-head{grid-template-columns:auto minmax(0,1fr);padding:16px}
.mlab .topic-chev{display:none}
.mlab .topic-body{padding:0 14px 16px}
.mlab .topic-num{width:38px;height:38px;font-size:.78rem}
.mlab .fs-list li{grid-template-columns:1fr;gap:2px}
.mlab .decide div{grid-template-columns:1fr;gap:2px}
.mlab .dock{padding-left:10px;padding-right:10px}
.mlab .dock .hide-sm{display:none}
.mlab .we-q,.mlab .steps{padding-left:12px;padding-right:12px}
.mlab .gap-card{padding:18px}}
.mlab{
  --ink:#00142A;--indigo-950:#00142A;--indigo-900:#002349;--indigo-800:#0A3466;--indigo-500:#164A86;--indigo-400:#0A8FDB;
  --brass-700:#00659F;--brass-500:#0A8FDB;--brass-400:#3FD8F7;--brass-300:#A9E9F8;
  --bg:#F6F4EE;--bg-deep:#EFEBE2;--surface:#FFFFFF;--surface-2:#FBFAF7;--tint:#E7F3FB;
  --line:#DAD5CA;--line-cool:#D5DEE8;--fg:#0D1B2D;--fg-soft:#3E4D61;--fg-mute:#6A7789;
  --accent:#002349;--accent-hover:#0A3466;--accent-ink:#00659F;--on-accent:#FFFFFF;
  --brass:#0A8FDB;--brass-ink:#00659F;--brass-bg:#E7F3FB;
  --good:#0F7A4F;--good-bg:#E3F4EC;--bad:#B4232F;--bad-bg:#FBE7E9;
  --f-display:"Newsreader",Georgia,serif;--f-body:"Source Sans 3","Segoe UI",Arial,sans-serif;--f-mono:ui-monospace,"Cascadia Mono","Courier New",monospace;
  --nav-h:64px;--max-w:1280px;
  background:var(--bg);color:var(--fg);font-family:var(--f-body);line-height:1.6;padding-bottom:84px}

/* EduHub integration */
.mlab .hero{background:var(--navy)}
.mlab .hero-rule{background:linear-gradient(90deg,var(--navy-700),var(--blue) 50%,var(--cyan) 80%,var(--pink))}
.mlab .wrap{max-width:var(--wrap);padding:0 var(--gut)}
.mlab .btn{border-radius:999px;font-family:var(--f-ui);letter-spacing:.04em}
.mlab .sec-eyebrow{font-family:var(--f-ui);letter-spacing:.16em}
.mlab .sec-head{display:block}
.mlab .tabs{border-bottom:1px solid var(--line)}
.mlab mjx-container{color:inherit}
.mlab mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden;max-width:100%;padding:2px 0}
html.fs-l{font-size:109%} html.fs-xl{font-size:118%}
body[data-page="maths-lab"] .assist-fab{bottom:96px}
body[data-page="maths-lab"] .to-top{bottom:96px}
body[data-page="maths-lab"] .cookie{bottom:96px}
body.focus .util,body.focus .masthead,body.focus .foot{opacity:.25}
.mlab .ring{width:auto;height:auto;background:none;display:inline-flex}
.mlab .ring::before{display:none}
.mlab .modal{width:auto;max-height:none;border-radius:0;box-shadow:none;animation:none;overflow:visible}