:root{color-scheme:light;--bg:#ffffff;--panel:#ffffff;--ink:#30383e;--muted:#67757e;--line:#dfe5e9;--line2:#f0f3f5;--accent:#087bb5;--accent-soft:#edf7fc;--on-accent:#ffffff;--on-status:#ffffff;--button-edge:#076899;--ok:#32804d;--ok-soft:#eaf6ed;--prog:#97621d;--prog-soft:#faf1de;--bad:#bb3a44;--bad-soft:#fff0f0;--locked:#8a98a2;--locked-soft:#f1f4f6;--fam:#7b5aab;--fam-soft:#f2eefb;--band:rgba(60,85,100,.025);--display:"Nunito",ui-rounded,system-ui,sans-serif}:root[data-theme=dark]{color-scheme:dark;--bg:#151e24;--panel:#19252d;--ink:#eef3f6;--muted:#a4b2bc;--line:#35444e;--line2:#24323c;--accent:#77c8ef;--accent-soft:#203d4d;--on-accent:#102530;--on-status:#102530;--button-edge:#4299c3;--ok:#97d4aa;--ok-soft:#233c2d;--prog:#e5bd7b;--prog-soft:#3e3325;--bad:#ffa8ad;--bad-soft:#452e34;--locked:#7e929f;--locked-soft:#24323b;--fam:#c8afe9;--fam-soft:#363047;--band:rgba(170,200,215,.035)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-size:15.5px;line-height:1.55;font-family:var(--display)}code,kbd{font-family:IBM Plex Mono,ui-monospace,Menlo,Consolas,monospace;font-size:.88em;background:var(--line2);padding:1px 5px;border-radius:3px}pre{background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:12px 14px;overflow-x:auto;line-height:1.5;margin:14px 0}pre code{background:none;padding:0;font-size:13.5px}a{color:var(--accent)}button{font:inherit;cursor:pointer;border-radius:5px;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:8px 14px}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.45;cursor:default}button.ok{background:var(--ok);border-color:var(--ok)}button.bad,button.ok{color:var(--on-status)}button.bad{background:var(--bad);border-color:var(--bad)}button.ghost{background:transparent}input,textarea{font:inherit;width:100%;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:5px;padding:10px 12px}textarea{min-height:96px;resize:vertical}input:focus,textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:5;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:4px;padding:10px 16px;flex-wrap:wrap}.brand{font-weight:600;margin-right:12px;letter-spacing:-.01em;line-height:1.1}.brand small{font-family:IBM Plex Mono,monospace;font-size:11px;color:var(--muted);display:block;letter-spacing:.06em}.tab{padding:7px 11px;border-radius:5px;font-weight:500}.pills{margin-left:auto;display:flex;gap:8px;align-items:center;font-family:IBM Plex Mono,monospace;font-size:11.5px;color:var(--muted)}.pill{border:1px solid var(--line);border-radius:99px;padding:2px 9px;background:var(--panel)}.pill.on{border-color:var(--ok);color:var(--ok)}.wrap{max-width:780px;margin:0 auto;padding:26px 18px 90px}h1{font-size:26px;letter-spacing:-.01em;margin:4px 0}h1,h2{font-weight:600}h2{font-size:19px;margin:26px 0 10px}h3{font-size:16px;font-weight:600;margin:18px 0 8px}.sub{color:var(--muted);margin:0 0 20px}.card{border:1px solid var(--line);border-radius:7px;padding:16px 18px;margin:12px 0}.card.hero{border-left:3px solid var(--accent)}.card h3{margin-top:0}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.spread{justify-content:space-between}.meta{font-size:11.5px;color:var(--muted);letter-spacing:.03em}.badge,.meta{font-family:IBM Plex Mono,monospace}.badge{font-size:11px;padding:2px 8px;border-radius:3px;background:var(--locked-soft)}.b-mastered{background:var(--ok-soft);color:var(--ok)}.b-familiar{background:var(--fam-soft);color:var(--fam)}.b-in_progress{background:var(--prog-soft);color:var(--prog)}.b-frontier{background:var(--accent-soft);color:var(--accent)}.b-locked{background:var(--locked-soft);color:var(--muted)}.feedback{border-radius:5px;padding:10px 14px;margin:10px 0;border:1px solid var(--line)}.feedback.good{background:var(--ok-soft);border-color:var(--ok)}.feedback.bad{background:var(--bad-soft);border-color:var(--bad)}.feedback.hint{background:var(--prog-soft);border-color:var(--prog)}.opt{display:block;width:100%;text-align:left;margin:7px 0;padding:11px 14px}.opt.correct{background:var(--ok-soft);border-color:var(--ok)}.opt.wrong{background:var(--bad-soft);border-color:var(--bad)}.progressbar{height:5px;border-radius:3px;margin:10px 0 22px;overflow:hidden}.progressbar i{display:block;height:100%;background:var(--accent);border-radius:3px;transition:width .3s}.timer{font-family:IBM Plex Mono,monospace;font-size:14px;padding:3px 10px;border:1px solid var(--line);border-radius:5px}.timer.low{color:var(--bad);border-color:var(--bad)}.qitem{border-top:1px solid var(--line2);padding-top:14px;margin-top:14px}.qitem:first-child{border-top:0;margin-top:0;padding-top:0}.stat{display:inline-block;min-width:92px;background:var(--panel);border-radius:6px;padding:10px 14px;margin:4px 6px 4px 0;border:1px solid var(--line);border-top:3px solid var(--tc,var(--line))}.stat b{display:block;font-size:24px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.stat span{font-size:12px;color:var(--muted)}figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:7px;padding:12px;overflow-x:auto}figure svg{width:100%;min-width:900px;height:auto;display:block}.band{fill:var(--band)}.bandlbl{font:500 13px IBM Plex Mono,monospace;fill:var(--ink)}.edge{stroke:var(--muted);stroke-opacity:.35;stroke-width:1}.edge-hot{stroke:var(--accent);stroke-opacity:.9;stroke-width:1.4}.arrhead{fill:var(--muted);fill-opacity:.6}.node{cursor:pointer}.node text{font:600 12px Nunito,sans-serif;fill:var(--ink);pointer-events:none}.node rect{stroke-width:1}.node.sel rect{stroke-width:2.5}.n-mastered rect{fill:var(--ok-soft);stroke:var(--ok)}.n-familiar rect{fill:var(--fam-soft);stroke:var(--fam)}.n-in_progress rect{fill:var(--prog-soft);stroke:var(--prog)}.n-frontier rect{fill:var(--accent-soft);stroke:var(--accent);stroke-width:1.6}.n-locked rect{fill:var(--locked-soft);stroke:var(--locked);stroke-dasharray:3 2}.n-locked text{fill:var(--muted)}ul{padding-left:22px}li{margin:4px 0}.small{font-size:13px;color:var(--muted)}.spin{animation:sp 1s linear infinite}.button-link,.spin{display:inline-block}.button-link{border:1px solid var(--line);border-radius:5px;padding:8px 12px;text-decoration:none;white-space:nowrap;font-size:14px}.button-link:hover{border-color:var(--accent);background:var(--accent-soft)}.material-item{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px 0;border-bottom:1px solid var(--line2)}.material-item:last-child{border-bottom:0}.material-item>div{min-width:0;overflow-wrap:anywhere}.material-item strong{font-size:14px}.library-filters{align-items:stretch}.library-filters input{flex:1 1;min-width:180px}select{font:inherit;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:5px;padding:9px}.card h2{margin:0 0 8px;font-size:17px}.topic-materials{margin:12px 0}summary{cursor:pointer;color:var(--accent);padding:5px 0}.reading-list{margin-top:10px}.reading-panel{border-left:3px solid var(--accent);padding:4px 14px;background:var(--accent-soft);border-radius:5px;margin:14px 0}.lesson-tutor{margin:14px 0}.tutor-shell{background:var(--bg);padding:16px}.tutor-panel{min-width:0}.tutor-context{font-size:13px;border-bottom:1px solid var(--line);padding:6px 0 12px}.tutor-messages{max-height:65vh;overflow-y:auto;overscroll-behavior:contain;margin:14px 0;scrollbar-gutter:stable}.tutor-message{border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin:12px 0;overflow-wrap:anywhere}.tutor-message.user{background:var(--accent-soft);margin-left:24px}.tutor-message.assistant{background:var(--panel);margin-right:12px}.tutor-message p:last-child{margin-bottom:0}.tutor-message pre{max-width:100%;overflow-x:auto}.tutor-empty{padding:18px 0}.tutor-challenge{border-top:1px solid var(--line);padding-top:8px;margin-top:16px}.tutor-composer{border-top:1px solid var(--line);padding-top:14px}.tutor-composer textarea{min-height:85px;margin:6px 0}.tutor-modes{margin-bottom:12px}.tutor-search{margin-top:18px}.tutor-search input{flex:1 1;min-width:200px}.tutor-thread{display:flex;width:100%;text-align:left;align-items:center;justify-content:space-between;gap:12px}.tutor-footnote{margin-top:24px}@media(max-width:560px){.tutor-thread{align-items:flex-start;flex-direction:column}.tutor-message.user{margin-left:10px}.tutor-shell{padding:10px}.tutor-composer .spread>button{width:100%}}a:focus-visible,button:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}@media(max-width:560px){.material-item{align-items:flex-start;flex-direction:column;gap:8px}.material-item .button-link{width:100%;text-align:center}.pills{width:100%;margin-top:6px}.tab{padding:7px 8px}.library-filters select{width:100%}}@keyframes sp{to{transform:rotate(1turn)}}.center{min-height:100dvh;display:grid;place-items:center;padding:20px}.loginbox{width:100%;max-width:360px}.toast{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:6px;z-index:20;max-width:90%;font-size:14px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.nav-more{position:relative}.nav-more summary{padding:7px 11px}.nav-more>div{position:absolute;right:0;top:100%;min-width:220px;display:grid;background:var(--panel);border:1px solid var(--line);border-radius:7px;padding:6px;box-shadow:0 8px 20px #0002}.nav-more .tab{text-align:left}.learning-context{padding:16px 0 10px}.learning-context h2{margin:5px 0 8px}.learning-context p{margin:8px 0}.learning-context details{font-size:14px}.optional-library>summary,.session-options>summary{font-weight:600;color:var(--ink)}.lesson-outline{margin:8px 0 14px}.lesson-outline ol{padding-left:24px}.lesson-outline button{border:0;padding:5px 8px;text-align:left;background:transparent}.lesson-outline button[aria-current=step]{background:var(--accent-soft);color:var(--accent);font-weight:600}.step-heading{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin-top:24px}.step-heading h2{width:100%;margin:3px 0 0;scroll-margin-top:125px;font-size:22px;outline:none}.exercise-instruction{color:var(--muted);padding-top:10px;border-top:1px solid var(--line)}.assigned-reading{margin:24px 0}.assigned-reading h2{margin-bottom:4px}.assigned-reading>.small{margin-top:4px}.reading-goal{border-left:3px solid var(--accent);padding:8px 12px;background:var(--accent-soft);font-size:14px}.reading-choices{margin:10px 0}.reading-panel{padding:10px 14px;margin:20px 0}.material-entry{border-bottom:1px solid var(--line2)}.material-entry:last-child{border:0}.material-entry .pdf-reader{margin-bottom:18px}.lesson-actions{margin-top:24px;border-top:1px solid var(--line);padding-top:18px;display:flex;gap:18px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap}.lesson-actions p{margin:6px 0 0}.lesson-actions .primary{min-height:46px}.pdf-reader{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--panel);min-width:0}.pdf-heading{padding:14px 16px;display:grid;grid-gap:4px;gap:4px}.pdf-heading strong{font-size:16px}.pdf-heading>span{font-size:13px}.pdf-footer,.pdf-toolbar{padding:10px 12px;display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--bg);border-top:1px solid var(--line)}.pdf-footer button,.pdf-footer select,.pdf-toolbar button,.pdf-toolbar select{font-size:13px;min-height:40px;padding:7px 9px}.pdf-pages{display:flex;align-items:center;gap:6px}.pdf-pages>button{min-width:40px}.pdf-footer a{font-size:13px}.pdf-viewport{background:#dce1e7;padding:12px;max-height:75vh;overflow:auto;overscroll-behavior:auto;scrollbar-gutter:stable;position:relative;min-height:100px;scroll-margin-top:140px}.pdf-viewport:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.pdf-surface{position:relative;background:white;color:black;box-shadow:0 2px 8px #0002;margin:0 auto;min-width:0}.pdf-surface[hidden]{display:none}.pdf-surface canvas{display:block}.pdf-loading{padding:0 16px;font-size:13px;color:var(--muted)}.pdf-plain{background:white;color:#17212b;white-space:pre-wrap;padding:18px;font-size:16px;line-height:1.8;overflow-wrap:anywhere}.pdf-surface .textLayer{position:absolute;inset:0;overflow:clip;text-align:initial;line-height:1;letter-spacing:normal;word-spacing:normal;text-size-adjust:none;forced-color-adjust:none;transform-origin:0 0;--min-font-size:1;--text-scale-factor:calc(var(--total-scale-factor) * var(--min-font-size));--min-font-size-inv:calc(1 / var(--min-font-size))}.pdf-surface .textLayer :is(span,br){color:transparent;position:absolute;white-space:pre;cursor:text;transform-origin:0 0;-webkit-user-select:text;-moz-user-select:text;user-select:text}.pdf-surface .textLayer .markedContent span:not(.markedContent),.pdf-surface .textLayer>:not(.markedContent){z-index:1;--font-height:0;font-size:calc(var(--text-scale-factor) * var(--font-height));--scale-x:1;--rotate:0deg;transform:rotate(var(--rotate)) scaleX(var(--scale-x)) scale(var(--min-font-size-inv))}.pdf-surface .textLayer .markedContent{display:contents}.pdf-surface .textLayer ::selection{background:rgba(0,80,255,.3);color:transparent}@media(max-width:560px){.brand{width:100%;margin-bottom:4px}.brand small,.pills{display:none}.wrap{padding:18px 12px 60px}.card{padding:14px}.pdf-toolbar>.row{gap:6px}.pdf-pages select{max-width:170px}.pdf-viewport{max-height:none;overflow-y:visible}.nav-more>div{position:fixed;right:12px;top:auto;max-width:calc(100vw - 24px)}.step-heading h2{scroll-margin-top:140px}.lesson-actions .primary,.lesson-actions>div:first-child{width:100%}.pdf-heading{padding:12px}.pdf-footer,.pdf-toolbar,.reading-panel{padding:8px}.reading-choices button{font-size:13px}}.hero h1[tabindex]{scroll-margin-top:140px;outline:none}.lesson-intro{padding:8px 0 4px}.lesson-intro>.meta{color:var(--accent);font-size:11px;letter-spacing:.08em}.lesson-intro h1{line-height:1.25;max-width:24ch}.lesson-intro .sub{font-size:14px;max-width:68ch;margin-bottom:14px}.lesson-outline{border-top:1px solid var(--line);padding-top:8px}.lesson-outline>summary{font-size:13px}.lesson-question{padding:26px 28px;border-top:2px solid var(--accent);border-radius:8px;margin-top:18px}.question-kind{font-size:10px;letter-spacing:.1em}.question-content{line-height:1.7;overflow-wrap:anywhere}.question-content>p:first-child{margin-top:12px}.lesson-question .exercise-instruction{font-size:13px;line-height:1.6;border:0;padding:0;margin:10px 0 20px}.answer-options{border:0;padding:0;margin:0;min-width:0}.answer-option{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:5px;cursor:pointer;min-height:58px;margin:9px 0;padding:13px 14px;line-height:1.45}.answer-option:hover:not(.tried){border-color:var(--accent)}.answer-option.selected:not(.correct):not(.wrong){border-color:var(--accent);background:var(--accent-soft)}.answer-option.correct{border-color:var(--ok);background:var(--ok-soft)}.answer-option.wrong{border-color:var(--bad);background:var(--bad-soft)}.answer-option.tried{border-style:dashed;cursor:default;color:var(--muted)}.answer-options[disabled] .answer-option{cursor:default}.answer-option:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:3px}.option-number{font-family:IBM Plex Mono,ui-monospace,monospace;font-size:11px;flex:0 0 24px}.option-text{flex:1 1;min-width:0;font-size:14px}.option-state{font-size:11px;color:var(--muted);text-align:right;max-width:90px}.answer-option.correct .option-state{color:var(--ok)}.answer-option.wrong .option-state{color:var(--bad)}.answer-submit{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:22px}.answer-submit button{min-height:44px}.answer-submit .small{font-size:12px}.lesson-tutor{padding:8px 0}.lesson-tutor>.ghost{color:var(--accent);border-color:var(--line);min-height:44px}.help-note{margin:8px 0 0;font-size:12px}.lesson-question .feedback{line-height:1.65}@media(max-width:560px){.lesson-intro h1{font-size:25px}.lesson-question{padding:20px 16px}.question-content{font-size:16px}.answer-option{gap:8px;padding:12px 10px;flex-wrap:wrap}.option-number{flex-basis:20px}.option-state:not(:empty){flex-basis:100%;max-width:none;text-align:left;padding-left:28px}.answer-submit>button,.lesson-tutor>.ghost{width:100%}}@media(prefers-reduced-motion:reduce){.spin{animation:none}.progressbar i{transition:none}}body{font-size:16px;font-weight:500;-webkit-font-smoothing:antialiased}::selection{background:var(--accent);color:var(--on-accent)}button{min-height:44px;border:2px solid var(--line);border-radius:12px;font-weight:750;padding:9px 16px;transition:background .12s,border-color .12s}button:hover:not(:disabled){background:var(--line2);border-color:var(--line)}button.primary{color:var(--on-accent);box-shadow:0 3px 0 var(--button-edge);font-weight:800}button.primary,button.primary:hover:not(:disabled){background:var(--accent);border-color:var(--accent)}button.primary:hover:not(:disabled){filter:brightness(1.06)}button.primary:active:not(:disabled){transform:translateY(2px);box-shadow:0 1px 0 var(--button-edge)}button.ok:hover:not(:disabled){background:var(--ok);border-color:var(--ok)}button.bad:hover:not(:disabled){background:var(--bad);border-color:var(--bad)}input,select,textarea{border:2px solid var(--line);border-radius:12px}.topbar{min-height:82px;padding:16px max(24px,calc((100vw - 1040px)/2));gap:24px;background:var(--bg)}.brand{width:auto;margin:0 24px 0 0;padding:0;border:0;color:var(--accent);font:900 30px/1 var(--display);letter-spacing:-1.2px}.brand,.brand:hover:not(:disabled){background:transparent}.nav-links{display:flex;align-items:center;gap:5px}.tab{padding:9px 15px;font-size:15px;border:0;min-height:44px;background:transparent;color:var(--muted);font-weight:800;border-radius:12px}.tab.active{background:var(--accent-soft);color:var(--accent)}.nav-more summary{list-style:none;min-height:44px;padding:10px 12px;font-size:15px;font-weight:800;color:var(--muted)}.nav-more summary:after{content:"⌄";margin-left:6px}.nav-more summary::-webkit-details-marker{display:none}.nav-more>div{z-index:10;padding:8px;border-radius:14px;box-shadow:0 6px 18px #10283814}.pills{font-family:var(--display);font-size:13px;font-weight:800;gap:12px}.pill{border:0;padding:0;background:transparent;white-space:nowrap}.pill:last-child{display:none}.theme-toggle{display:grid;place-items:center;min-width:42px;width:42px;padding:0;border:0;background:transparent;color:var(--muted)}.wrap{max-width:760px;padding:42px 28px 70px;min-height:calc(100dvh - 82px)}.wrap.wide{max-width:1140px}h1,h2,h3{font-family:var(--display);font-weight:800;line-height:1.25;letter-spacing:-.4px}h1{font-size:32px;margin:0 0 14px}h2{font-size:23px}h3{font-size:18px}.sub{font-size:15px;line-height:1.65}.small{font-size:14px}.meta{font-size:13px;font-weight:700;letter-spacing:0}.badge,.meta{font-family:var(--display)}.badge{font-size:12px;font-weight:800;padding:4px 10px;border-radius:8px}.card{border:2px solid var(--line);border-radius:18px;padding:24px;background:var(--panel)}.card.hero{border-left:2px solid var(--accent)}.day-heading{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:24px}.day-heading h1{margin:0}.day-heading p{margin:0;color:var(--muted);font-size:14px;font-weight:600}.day-heading p:first-letter{text-transform:uppercase}.next-lesson.card{margin:0;padding:30px 32px;border:2px solid var(--line)}.subject-label{display:inline-block;font-size:14px;font-weight:800;color:var(--accent);margin:0 0 15px}.next-lesson h2{font-size:28px;line-height:1.25;margin:0 0 10px;max-width:28ch}.lesson-description{font-size:15px;line-height:1.6;color:var(--muted);margin:0 0 28px}.lesson-track{display:flex;gap:3px;border-radius:10px;overflow:hidden}.lesson-track,.lesson-track>span{height:10px;background:var(--line2)}.lesson-track>span{flex:1 1}.lesson-track .complete{background:var(--accent)}.lesson-track .current{background:var(--accent-soft)}.lesson-track-caption{font-size:13px;color:var(--muted);font-weight:700;margin:10px 0 24px;gap:6px}.continue-button{width:100%;min-height:48px;font-size:16px;letter-spacing:.2px}.daily-strip{display:grid;grid-template-columns:1fr 1fr 1fr;margin:25px 0 28px;padding:8px 0;grid-gap:0;gap:0}.daily-strip>div{text-align:center;border-left:1px solid var(--line);padding:0 14px;min-width:0}.daily-strip>div:first-child{border:0}.daily-strip p{margin:0 0 3px;line-height:1.3;white-space:nowrap}.daily-strip strong{font-size:23px;font-weight:800}.daily-strip p>span{font-size:14px;color:var(--muted);font-weight:700}.daily-strip .small{font-size:13px}.optional-library.card,.session-options.card{background:transparent;border:0;border-top:1px solid var(--line);border-radius:0;padding:16px 0;margin:0}.context-disclosure>summary,.optional-library>summary,.session-options>summary{color:var(--ink);font-size:15px;font-weight:750;min-height:40px;align-content:center}.context-disclosure{border-top:1px solid var(--line);padding:16px 0}.learning-context{font-size:15px}.learning-context h2{font-size:22px;font-weight:800}.progressbar{height:10px;background:var(--line2)}.progressbar,.progressbar i{border-radius:10px}.lesson-intro{padding:0;margin-bottom:24px}.lesson-intro>.meta{font-size:12px;color:var(--muted);letter-spacing:0}.lesson-intro h1{font-size:30px;line-height:1.3;margin:12px 0}.lesson-intro .sub{font-size:15px}.lesson-outline{border:0;padding:0}.lesson-outline>summary{font-size:14px;color:var(--muted)}.step-heading h2{font-size:25px;font-weight:800;margin-top:8px}.step-heading .badge{color:var(--accent);background:var(--accent-soft)}.lesson-question{border-top:2px solid var(--line);padding:26px;border-radius:18px}.question-kind{font-family:var(--display);font-size:12px;font-weight:800;letter-spacing:.2px;color:var(--muted)}.question-content{font-size:17px;line-height:1.75}.question-content strong{font-weight:800}pre{background:var(--line2);border:0;border-radius:12px;padding:18px}pre code{color:var(--ink);font-size:13px}.answer-option{border:2px solid var(--line);border-radius:14px;background:var(--panel);padding:15px;min-height:62px;margin:12px 0}.option-number{font-family:var(--display);font-size:13px;font-weight:800;color:var(--muted)}.option-text{font-size:16px;font-weight:600}.option-state{font-size:12px}.exercise-instruction,.lesson-question .exercise-instruction{font-size:14px}.node:focus-visible{outline:none}.node:focus-visible rect{stroke:var(--ink);stroke-width:3}.loginbox{max-width:400px}.login-brand{display:flex;align-items:center;color:var(--accent);font-size:30px;font-weight:900;letter-spacing:-1px;margin-bottom:42px}.login-brand .theme-toggle{margin-left:auto}.loginbox h1{font-size:32px}.loginbox>label{display:block;font-weight:700;margin:22px 0 8px}.skip-link{position:fixed;z-index:30;left:20px;top:-80px;background:var(--accent);color:var(--on-accent);padding:12px 20px;border-radius:10px}.skip-link:focus{top:12px}@media(max-width:1000px){.topbar{gap:14px;padding:14px 24px}.brand{margin-right:8px}.tab{padding:9px 12px}}@media(max-width:760px){.topbar{padding:10px 20px;gap:10px;justify-content:space-between}.brand{width:auto;margin:0}.pills{display:flex;width:auto;margin:0 0 0 auto}.nav-links{order:3;width:100%;justify-content:space-between;gap:0}.nav-more>div{right:0}.theme-toggle{margin-left:2px}.wrap{padding:28px 20px 55px}.day-heading{margin-bottom:20px}.next-lesson.card{padding:26px}.next-lesson h2{font-size:26px}}@media(max-width:480px){.topbar{padding:9px 16px;gap:8px}.brand{font-size:28px}.tab{font-size:14px;padding:9px 10px}.nav-more summary{font-size:14px;padding:10px 8px}.wrap{padding:24px 16px 45px}.day-heading{display:block}.day-heading h1{font-size:29px;margin-bottom:5px}.day-heading p{font-size:14px}.next-lesson.card{padding:23px}.next-lesson h2{font-size:25px}.lesson-description{font-size:14px;margin-bottom:24px}.daily-strip>div{padding:0 8px}.daily-strip strong{font-size:21px}.daily-strip p>span{font-size:12px}.daily-strip .small{font-size:12px;display:block;line-height:1.3}.lesson-track-caption{font-size:12px}.card{padding:20px}.lesson-intro h1{font-size:26px}.lesson-question{padding:20px 16px}.step-heading h2{font-size:24px}.option-text{font-size:15px}.nav-more>div{right:12px}.lesson-intro>.meta{font-size:11px}}@media(prefers-reduced-motion:reduce){button{transition:none}button.primary:active:not(:disabled){transform:none}}@media(max-width:380px){.tab{font-size:13px;padding:9px 7px}.nav-more summary{font-size:13px;padding:10px 6px}.nav-more summary:after{margin-left:4px}}@media(max-width:760px){.step-heading h2{scroll-margin-top:200px}}.despeja-logo{display:inline-flex;align-items:center;gap:7px;white-space:nowrap}.despeja-mark{display:flex;align-items:center;justify-content:center;width:32px;height:38px;overflow:hidden;flex:none}.despeja-mark img{display:block;max-width:none;width:52px;height:52px}.gre-header .sub{margin:0 0 22px}.gre-tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--line);padding-bottom:12px}.gre-tabs button{border-color:transparent;background:transparent;color:var(--muted)}.gre-tabs button.active{background:var(--accent-soft);color:var(--accent)}.gre-page h2{font-size:22px}.gre-page h3{margin:0 0 8px}.gre-page .card h2{font-size:22px}.gre-start .small{margin-bottom:0}.gre-domains{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px;margin:16px 0 24px}.gre-domains .card{margin:0;display:flex;flex-direction:column;align-items:flex-start}.gre-domains .small{margin:0;min-height:44px}.gre-domains button{margin-top:auto;font-size:14px}.gre-domains details{margin-top:14px;font-size:14px;line-height:1.65}.gre-domains details li{margin-bottom:8px}.gre-domains details ul{padding-left:18px}.gre-evidence{font-size:13px;color:var(--muted);margin:14px 0 18px}.gre-settings label{display:grid;grid-gap:8px;gap:8px;font-weight:750;flex:1 1;min-width:150px}.gre-settings .row{align-items:end;gap:18px;margin:20px 0}.gre-settings select{min-height:46px}.gre-week-list{list-style:none;padding:0;margin:30px 0}.gre-week-list>li{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.gre-week-number{display:grid;place-items:center;flex:none;width:34px;height:34px;background:var(--accent-soft);color:var(--accent);border-radius:50%;font-weight:850}.gre-week-list p{margin:8px 0 12px}.gre-resources{border-top:1px solid var(--line);padding-top:18px;margin-top:32px;font-size:14px}.gre-resources>summary{font-weight:700;color:var(--muted)}.gre-resources li{margin:10px 0}.gre-session-label{margin:25px 0 10px}.gre-focus{margin:26px 0 20px;scroll-margin-top:125px;outline:none}.gre-question{margin-top:0}.gre-prompt{font-size:19px;line-height:1.65;margin:0 0 24px}.gre-quantities{display:grid;grid-template-columns:1fr 1fr;margin:22px 0 30px;text-align:center;grid-gap:12px;gap:12px}.gre-quantities>div{border:1px solid var(--line);border-radius:12px;padding:16px 10px}.gre-quantities b{font-size:14px;color:var(--muted)}.gre-quantities p{font-size:20px;margin:10px 0 0}.gre-question .answer-option{flex-wrap:nowrap;font-size:17px;gap:14px}.gre-question .answer-option input{width:19px;height:19px;flex:0 0 19px;margin:0;accent-color:var(--accent)}.gre-question fieldset legend{margin-bottom:4px}.gre-question .answer-option:last-child{margin-bottom:0}.gre-numeric label{display:block;font-weight:700;margin-bottom:10px}.gre-numeric input{max-width:260px;font-size:20px}.gre-invalid{color:var(--bad)}.gre-table-wrap{overflow-x:auto;margin-bottom:24px}.gre-table-wrap table{width:100%;border-collapse:collapse;text-align:left}.gre-table-wrap caption{text-align:left;color:var(--muted);font-size:14px;margin-bottom:8px}.gre-table-wrap td,.gre-table-wrap th{border-bottom:1px solid var(--line);padding:9px 12px}.gre-actions{gap:12px;margin-top:24px}.gre-actions button{font-size:14px}.gre-question-nav{display:flex;flex-wrap:wrap;gap:8px;margin:30px 0 18px}.gre-question-nav button{min-width:46px;padding:8px}.gre-question-nav button[aria-current=step]{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.gre-discard{margin-top:14px;font-size:14px}.gre-discard summary{color:var(--muted)}.gre-result>summary{font-weight:800;color:var(--ink)}.gre-result[open]>summary{margin-bottom:20px}@media(max-width:760px){.gre-focus{scroll-margin-top:190px}}@media(max-width:560px){.gre-domains{grid-template-columns:1fr}.gre-domains .small{min-height:0}.gre-question .gre-prompt{font-size:18px}.gre-actions .primary{width:100%;order:2}.gre-week-list>li{gap:12px}.gre-week-number{width:28px;height:28px}.gre-week-list h3{font-size:17px}}@media(max-width:380px){.despeja-mark{width:27px}.despeja-logo{gap:4px}.brand{font-size:26px}.pills{font-size:12px}}.routes-topbar .theme-toggle{margin-left:auto}.study-heading{margin-bottom:26px}.study-heading h1{margin-bottom:8px}.study-heading .sub{margin:0}.study-routes{display:grid;grid-gap:14px;gap:14px}.study-route.card{display:flex;align-items:center;gap:20px;margin:0;padding:23px 25px;text-align:left;font-weight:500;line-height:1.5}.study-route.card:hover{border-color:var(--accent);background:var(--accent-soft)}.route-card-body{display:grid;grid-gap:8px;gap:8px;min-width:0;flex:1 1}.route-card-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.route-card-heading strong{font-size:25px;font-weight:800;line-height:1.25}.route-card-heading .small{font-size:12px;font-weight:700}.route-description{font-size:15px;color:var(--ink)}.route-status{font-size:13px;color:var(--muted)}.route-arrow{font-size:23px;color:var(--accent);flex:none}.study-rhythm{margin:26px 0;padding:14px 0;border-bottom:1px solid var(--line)}.study-rhythm>summary{color:var(--ink);font-weight:750}.study-rhythm li{margin:12px 0}.study-tools{margin-top:28px}.study-tools h2{font-size:20px;margin-bottom:8px}.study-tools>.small{margin-top:0}.route-toolbar{margin-bottom:28px}.route-caption{color:var(--accent);font-weight:800;margin:0 0 12px;font-size:15px}.route-toolbar>.row>.small{font-size:12px;margin-bottom:12px}.route-tabs{display:flex;flex-wrap:wrap;align-items:center;gap:4px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:26px}.route-toolbar .route-tabs{margin-bottom:0}.route-tabs>button{border:0;background:transparent;padding:9px 13px;color:var(--muted);font-size:14px}.route-tabs>button.active{background:var(--accent-soft);color:var(--accent)}.route-tabs .nav-more{margin-left:auto}.route-tabs .nav-more summary{font-size:14px;min-height:44px;padding:10px 12px}.route-tabs .nav-more>div{right:0}.tool-back{margin-bottom:24px}.class-list{display:grid;grid-gap:14px;gap:14px;margin-bottom:22px}.class-card.card{display:flex;align-items:center;justify-content:space-between;width:100%;gap:20px;margin:0;padding:22px 24px;text-align:left;font-weight:500;line-height:1.55}.class-card>span:first-child{display:grid;grid-gap:5px;gap:5px;min-width:0}.class-card strong{font-size:22px;font-weight:800;line-height:1.3}.class-card .meta,.class-count{font-size:12px}.class-count{color:var(--muted);margin-top:5px}.class-arrow{color:var(--accent);font-size:23px}.class-source{border-top:1px solid var(--line);padding-top:18px;margin-top:30px;font-size:13px}.class-heading{margin:22px 0}.class-heading .subject-label{margin-bottom:10px}.class-heading h1{margin-bottom:8px}.class-heading .sub{margin:0}.class-workflow{padding-left:22px}.class-workflow li{margin:12px 0}.classes-page .card h2{font-size:22px}.class-connections{margin:25px 0}.class-connections summary{color:var(--muted);font-weight:700}.class-connections button{font-size:14px}@media(max-width:760px){.routes-topbar .theme-toggle{margin-left:auto}.routes-topbar .nav-links{justify-content:space-around}.route-tabs .nav-more>div{position:absolute;right:0;max-width:calc(100vw - 40px)}}@media(max-width:480px){.study-route.card{padding:22px}.route-card-heading strong{font-size:23px}.route-card-heading{gap:8px}.class-card.card{padding:20px}.class-card strong{font-size:20px}.route-tabs>button{padding:9px 10px;font-size:13px}.route-tabs .nav-more summary{font-size:13px;padding:10px 8px}.class-workflow{font-size:15px}.classes-page .card .row>*{width:100%;text-align:center}}@media(max-width:380px){.route-tabs>button{padding:9px 8px}.route-tabs .nav-more summary{padding:10px 5px}}