@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800;900&display=swap');
:root{--purple:#5546a3;--ink:#252044;--muted:#78738e;--line:#eae6f3;--lav:#efebfc;--mint:#e6f7f1;--peach:#fff0e2}*{box-sizing:border-box}body{margin:0;background:#f8f7fc;color:var(--ink);font-family:'Nunito',system-ui,sans-serif;font-size:16px}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,select{cursor:pointer}button,a,input,select{outline-offset:4px}button:focus-visible,a:focus-visible{outline:3px solid #aa91eb}button{border:0}button:disabled{cursor:default;opacity:.55}[hidden]{display:none!important}.shell{display:grid;grid-template-columns:235px minmax(0,1fr);min-height:100dvh}.sidebar{height:100dvh;position:sticky;top:0;background:white;border-right:1px solid var(--line);padding:32px 18px 20px;display:flex;flex-direction:column;gap:24px}.brand-lock{display:block;width:190px;max-width:100%;margin:0 auto 24px}.brand-lock img{display:block;width:100%}.brand-lock span{display:block;text-align:right;font-size:10px;letter-spacing:3px;color:var(--purple);font-weight:800;margin-top:-2px;padding-right:10px}.menu{display:grid;gap:13px}.menu a{display:flex;gap:16px;align-items:center;padding:16px;border-radius:14px;font-weight:800;color:#55516d}.menu a.active{background:var(--lav);color:var(--purple)}.icon{width:24px;height:24px;stroke:currentColor;stroke-width:1.8;fill:none;flex:none}.side-bottom{margin-top:auto;display:grid;gap:18px}.side-bottom a{display:flex;gap:12px;align-items:center;padding:12px}.profile{border-top:1px solid var(--line)}.avatar{width:40px;height:40px;display:grid;place-items:center;border-radius:50%;background:var(--lav);color:var(--purple);font-weight:900}.small{font-size:13px;color:var(--muted)}.profile small{display:block;color:var(--muted);font-size:12px}.main{min-width:0;padding:24px 32px 48px;max-width:1600px;width:100%;margin:0 auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:36px}.crumb{font-size:14px;color:var(--muted)}.top-actions{display:flex;gap:12px;align-items:center}.top-actions select,.language{border:1px solid var(--line);border-radius:12px;background:white;color:var(--ink);padding:11px 15px;font-weight:700;min-height:44px}.mobile-menu{display:none}.page-title{font-size:clamp(28px,3vw,42px);font-weight:900;line-height:1.2;letter-spacing:-1px;margin:0 0 6px}.subtitle{font-size:18px;color:var(--muted);margin:0 0 28px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(260px,1fr);gap:20px}.card{border:1px solid var(--line);border-radius:20px;background:white;padding:24px;min-width:0}.continue{background:#ece7fc;position:relative;min-height:285px;overflow:hidden;display:flex;align-items:center}.hero-copy{z-index:1;width:62%}.eyebrow{font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--purple);font-weight:900}.continue h2{font-size:29px;line-height:1.2;margin:13px 0 8px;letter-spacing:-.5px}.continue p{color:#6d668b;margin:0 0 18px}.hero-illustration{position:absolute;width:43%;right:0;bottom:24px;pointer-events:none}.btn{display:inline-flex;justify-content:center;align-items:center;gap:10px;padding:12px 18px;border-radius:11px;background:var(--purple);color:white;font-weight:800;min-height:44px}.btn.secondary{background:var(--lav);color:var(--purple)}.btn.mint{background:var(--mint);color:#226b59}.btn.outline{background:white;color:var(--purple);border:1px solid var(--line)}.btn:hover{filter:brightness(.97)}.target h2{font-size:23px;margin:0 0 20px}.goal{display:flex;gap:12px;align-items:center;padding:12px 8px;margin:8px 0;background:#f9f8fd;border-radius:10px;font-size:14px}.goal.done{background:var(--mint)}.goal-dot{display:grid;place-items:center;width:25px;height:25px;border-radius:50%;border:2px solid #d6cfee;color:var(--purple);flex:none}.goal.done .goal-dot{background:#48b79a;color:white;border-color:#48b79a}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:28px 0 16px}.section-head h2{font-size:24px;margin:0;font-weight:900}.text-link{font-weight:800;color:var(--purple);font-size:14px}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic-card{display:flex;gap:14px;align-items:center;padding:18px;background:white;border:1px solid var(--line);border-radius:17px;transition:transform .15s}.topic-card:hover{transform:translateY(-2px);border-color:#c8bdeb}.topic-card h3{margin:0 0 5px;font-size:17px}.topic-card p{margin:0;font-size:12px;color:var(--muted)}.topic-icon{display:block;flex:none;width:78px;height:78px;background-image:url('/assets/numi-ui/topics.png');background-size:300% 200%;background-repeat:no-repeat}.topic-icon.i0{background-position:0 0}.topic-icon.i1{background-position:50% 0}.topic-icon.i2{background-position:100% 0}.topic-icon.i3{background-position:0 100%}.topic-icon.i4{background-position:50% 100%}.topic-icon.i5{background-position:100% 100%}.summary-strip{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:22px}.summary-strip strong{font-size:24px}.summary-strip small{display:block;color:var(--muted);font-size:13px}.search-row{display:flex;gap:16px;align-items:center;margin-bottom:24px}.search{border:1px solid var(--line);border-radius:12px;padding:13px 16px;width:100%;background:white;color:var(--ink)}.tabs{display:flex;gap:5px;flex-wrap:wrap;padding:5px;background:white;border:1px solid var(--line);border-radius:12px}.tabs button,.tabs a{padding:9px 14px;border-radius:9px;background:transparent;white-space:nowrap;color:var(--muted);font-weight:700;font-size:14px}.tabs .active{background:var(--purple);color:white}.library{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.resource{padding:12px}.resource-art{height:130px;border-radius:13px;display:flex;align-items:center;justify-content:center;background:#f0ecfc}.resource-art .topic-icon{width:145px;height:130px}.resource h3{margin:16px 8px 6px;font-size:19px}.resource p{margin:0 8px 14px;font-size:13px;color:var(--muted)}.resource-actions{display:flex;gap:8px;margin:14px 6px 5px}.resource-actions a{flex:1;font-size:13px;padding:10px 8px}.status{font-size:11px;border-radius:20px;padding:4px 9px;background:var(--mint);color:#337a66;display:inline-block;margin-left:8px}.status.pending{background:#f3f1f7;color:#878194}.challenge-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.challenge-card{min-height:210px;display:flex;flex-direction:column;align-items:start;background:#f0ecfc}.challenge-card:nth-child(2){background:var(--peach)}.challenge-card h2{font-size:27px;margin:10px 0}.challenge-card p{color:var(--muted);line-height:1.6}.challenge-card .btn{margin-top:auto}.path-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(250px,1fr);gap:22px}.path-head{display:flex;align-items:center;gap:20px;justify-content:space-between;margin-bottom:22px}.path-head h2{margin:0 0 8px;font-size:24px}.path-head p{margin:0;color:var(--muted);font-size:14px}.path-list{display:grid;gap:13px}.path-step{display:flex;gap:16px;position:relative}.path-step:not(:last-child):before{content:'';position:absolute;left:21px;top:42px;height:calc(100% - 17px);width:2px;background:#e0d9f1}.step-number{z-index:1;flex:none;width:44px;height:44px;margin-top:10px;display:grid;place-items:center;border-radius:50%;background:#f0edf8;color:#78718f;font-size:18px;font-weight:900}.path-step.done .step-number{background:#56ba9c;color:white}.path-step.current .step-number{background:var(--purple);color:white}.step-card{flex:1;border:1px solid var(--line);border-radius:13px;padding:17px;display:flex;align-items:center;justify-content:space-between;gap:12px}.step-card h3{margin:0 0 5px;font-size:18px}.step-card p{font-size:13px;color:var(--muted);margin:0}.path-step.current .step-card{background:var(--lav);border-color:#b2a0e2}.path-step.done .step-card{background:#edf9f4}.step-card .btn{font-size:13px;padding:9px 12px}.path-aside{display:grid;gap:18px;align-content:start}.ring{width:140px;height:140px;margin:22px auto;display:grid;place-items:center;border:12px solid var(--lav);border-radius:50%;font-size:34px;font-weight:900;color:var(--purple)}.notice{padding:13px 16px;border-radius:12px;background:#f0edf7;color:#77708c;font-size:13px;line-height:1.5;margin:20px 0}.empty{text-align:center;padding:55px 28px;border:1px dashed #d7ceeb;border-radius:20px;background:white;line-height:1.7}.empty h2{font-size:26px}.notes-grid{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px}.note-nav{display:grid;gap:8px;align-content:start;position:sticky;top:24px;align-self:start}.note-nav a{padding:12px;border-radius:9px;font-size:14px}.note-nav a.active{background:var(--lav);color:var(--purple);font-weight:900}.note-content h2{font-size:27px;margin-top:0}.note-content p{line-height:1.8}.note-content .equation{font-size:clamp(20px,2.5vw,30px);text-align:center;padding:24px 12px;background:var(--lav);border-radius:13px;font-weight:900;margin:20px 0}.place-table{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:20px 0}.place-table>div{text-align:center;border:1px solid var(--line);background:#f8f5fe;border-radius:11px;padding:16px 5px}.place-table strong{font-size:32px;display:block;color:var(--purple)}.place-table small{display:block;margin-top:7px;color:var(--muted)}.worked{background:var(--mint);padding:17px;border-radius:12px;line-height:1.7}.mistake{background:var(--peach);padding:17px;border-radius:12px;margin-top:14px;line-height:1.7}.quick{margin-top:22px;border-top:1px solid var(--line);padding-top:20px}.quick label{display:block;font-weight:800;margin-bottom:10px}.answer-row{display:flex;gap:10px;flex-wrap:wrap}.answer-row input{padding:12px;border:1px solid #d8d0e9;border-radius:10px;min-width:100px;flex:1;width:140px}.feedback{font-size:14px;color:#32745e;min-height:24px}.note-footer{display:flex;gap:12px;justify-content:space-between;align-items:center;flex-wrap:wrap;margin-top:25px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.stat strong{font-size:42px;color:var(--purple);display:block}.bar{height:10px;background:var(--lav);border-radius:20px;overflow:hidden;margin:12px 0}.bar span{display:block;height:100%;background:#53bea0;border-radius:20px}.setting-form{max-width:600px;display:grid;gap:18px}.setting-form label{font-weight:800}.setting-form input{display:block;padding:12px;border:1px solid var(--line);border-radius:10px;width:100%;margin-top:8px}.footer-note{margin-top:26px;font-size:12px;color:var(--muted)}
@media(min-width:1450px){.main{padding:30px 44px 50px}.continue{min-height:310px}.topic-card{padding:22px}}
@media(max-width:1150px){.shell{grid-template-columns:195px 1fr}.sidebar{padding:24px 12px}.main{padding:22px}.brand-lock{width:165px}.hero-grid{grid-template-columns:1fr}.target{display:none}.hero-copy{width:65%}.library{grid-template-columns:repeat(2,1fr)}.topic-grid{grid-template-columns:repeat(2,1fr)}.path-grid{grid-template-columns:1fr}.path-aside{grid-template-columns:1fr 1fr}.notes-grid{grid-template-columns:160px 1fr}.search-row{flex-wrap:wrap}}
@media(max-width:760px){.shell{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;width:240px;z-index:50;transform:translateX(-100%);transition:transform .2s;box-shadow:10px 0 30px #24203c19}.sidebar.open{transform:translateX(0)}.mobile-menu{display:block;background:white;border:1px solid var(--line);border-radius:9px;padding:8px 11px}.crumb{display:none}.topbar{margin-bottom:25px;gap:8px}.top-actions{gap:7px}.top-actions select,.language{font-size:12px;padding:9px}.main{padding:20px 16px 35px}.page-title{font-size:29px}.subtitle{font-size:16px}.continue{min-height:270px;padding:20px}.continue h2{font-size:25px}.hero-illustration{width:40%;opacity:.8}.hero-copy{width:70%}.topic-grid{gap:10px}.topic-card{padding:12px;gap:8px}.topic-icon{width:52px;height:52px}.topic-card h3{font-size:14px}.topic-card p{font-size:10px}.summary-strip{flex-wrap:wrap;gap:20px}.summary-strip>h3{width:100%;margin:0}.section-head h2{font-size:21px}.library{gap:12px}.resource h3{font-size:16px}.resource-actions{flex-direction:column}.resource-art{height:100px}.resource-art .topic-icon{width:120px;height:100px}.challenge-grid{grid-template-columns:1fr}.notes-grid{grid-template-columns:1fr}.note-nav{position:static;display:flex;overflow:auto}.note-nav a{white-space:nowrap}.note-content{padding:20px}.path-aside{grid-template-columns:1fr}.step-card{align-items:start;flex-direction:column}.path-head{flex-direction:column;align-items:start}.stats{grid-template-columns:1fr}.place-table{gap:5px}.place-table small{font-size:10px}.place-table strong{font-size:28px}.tabs{width:100%}.tabs button{flex:1;padding:9px 8px;font-size:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.collection-toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:22px 0}.collection-toolbar select{border:1px solid var(--line);border-radius:10px;background:white;color:var(--ink);padding:12px;max-width:100%}.part-card{display:flex;flex-direction:column;align-items:start;gap:10px}.part-card h2{font-size:21px;line-height:1.3;margin:4px 0}.part-card .eyebrow{font-size:10px;letter-spacing:.7px}.part-card .bar{width:100%;margin:0}.part-card .btn{margin-top:auto;align-self:stretch}.part-card p{margin:0}.focus-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.focus-grid .card{padding:18px}.focus-grid h3{color:var(--purple);margin:0 0 8px}.focus-grid p{font-size:12px;margin:0;color:var(--muted)}@media(max-width:1100px){.focus-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:700px){.focus-grid{grid-template-columns:repeat(2,1fr)}.collection-toolbar .tabs{width:100%}.collection-toolbar select{flex:1;min-width:130px}}

/* NUMI original textbook-style year 3 lessons */
.numi-lesson-layout{display:grid;grid-template-columns:minmax(170px,235px) minmax(0,1fr);gap:20px;align-items:start}.numi-lesson-nav{position:sticky;top:18px;display:grid;gap:7px}.numi-lesson-nav a{padding:12px;border-radius:11px;text-decoration:none;background:#f3effd;color:#493d76}.numi-lesson-nav a[aria-current]{background:#ddd4fa;font-weight:700}.numi-lesson-main{min-width:0}.numi-note-tabs{display:flex;gap:8px;overflow-x:auto;white-space:nowrap;margin:18px 0}.numi-note-tabs a{background:#f0eafc;border-radius:24px;padding:9px 13px;text-decoration:none;color:#463b79;font-size:13px}.numi-notes-panel{border-top:1px solid #e4dff0;padding:18px 0;scroll-margin-top:20px}.numi-notes-panel h3{margin:0 0 10px}.numi-illustration{width:100%;height:auto;max-height:300px;display:block;margin:14px auto}.numi-example{font-size:1.35rem;font-weight:700;background:#f4f0ff;border-radius:12px;padding:16px}.numi-answer-row{display:flex;gap:12px;flex-wrap:wrap;margin:10px 0}.numi-answer-row input{padding:12px;border-radius:10px;border:1px solid #9f95c4;min-width:120px;flex:1}.numi-feedback-correct{color:#157b59;font-weight:700}.numi-feedback-retry{color:#93562f;font-weight:700}.numi-note-next{display:flex;justify-content:flex-end;margin-top:14px}@media(max-width:700px){.numi-lesson-layout{grid-template-columns:1fr}.numi-lesson-nav{position:static;display:flex;overflow:auto;gap:8px}.numi-lesson-nav a{white-space:nowrap;font-size:12px}}

/* v67 textbook-style assets: keep whole diagram visible on tablets and mobile */
.numi-textbook-asset{display:block;width:100%;height:auto;max-height:310px;object-fit:contain;margin:16px auto;border-radius:16px;background:#f7f5ff;}
@media(max-width:600px){.numi-textbook-asset{max-height:235px;}}