.learner-app .orbit-study{--orbit-surface:var(--surface,#fff);--orbit-ink:var(--ink,#18232f);--orbit-muted:var(--subtle,#597080);--orbit-line:var(--line,#e2e8ed);--orbit-note:#f0f7fb;--orbit-success:#25703b;--orbit-success-fill:#effaf1;--orbit-warning:#80652a;--orbit-warning-fill:#fff9e8;--orbit-gradient:linear-gradient(105deg,#2061c8,#087f94);color:var(--orbit-ink);background:var(--orbit-surface);font-size:15px}.learner-app[data-theme=dark] .orbit-study{--orbit-note:#20374a;--orbit-success:#a0e5b1;--orbit-success-fill:#17392e;--orbit-warning:#efd58c;--orbit-warning-fill:#3b3422}.learner-app .orbit-study.orbit-lesson{width:100%;max-width:1500px;min-height:calc(100svh - 80px);margin:0 auto;padding:8px 24px 28px}.orbit-study *{box-sizing:border-box}.orbit-study [hidden]{display:none!important}.orbit-study button{font:inherit;touch-action:manipulation}.orbit-study button:disabled{cursor:default;opacity:.55}.orbit-page:focus{outline:0}.orbit-page .app-block-heading h2{margin:0;font-size:18px}.orbit-page .app-example-heading h3{margin:0 0 10px;font-size:13px}.orbit-entry{z-index:5;background:var(--orbit-surface);border-radius:20px;position:absolute;inset:0;overflow:hidden}.orbit-entry-trail{background:linear-gradient(#0000,#b7d8f045,#a2e5dc6e);width:70px;height:360px;animation:3.3s cubic-bezier(.3,.1,.5,1) both orbit-entry-flight;position:absolute;top:calc(50% - 360px);left:calc(50% - 35px)}.orbit-entry-trail img{object-fit:contain;width:62px;height:76px;position:absolute;bottom:-33px;left:4px;transform:rotate(-7deg)}@keyframes orbit-entry-flight{0%{opacity:0;transform:translateY(-400px)}12%{opacity:1}35%{transform:translateY(0)}70%{transform:translateY(0)}to{opacity:0;transform:translateY(600px)}}.orbit-page .app-block-heading h3{margin:0;font-size:18px}.learner-app .orbit-study{--orbit-muted:#586b80}.learner-app[data-theme=dark] .orbit-study{--orbit-muted:#b0c2db}.orbit-top{grid-template-columns:60px minmax(0,1fr) 60px;align-items:center;gap:18px;min-height:58px;display:grid}.orbit-icon{width:40px;height:40px;color:var(--orbit-muted);background:0 0;border:0;border-radius:10px;place-items:center;text-decoration:none;display:grid}.orbit-icon:hover{background:var(--orbit-note)}.orbit-progress-group{justify-self:center;align-items:center;gap:10px;width:100%;max-width:510px;display:flex}.orbit-progress-group progress{appearance:none;background:var(--orbit-line);border:0;border-radius:10px;flex:1;width:100%;height:7px;overflow:hidden}.orbit-progress-group progress::-webkit-progress-bar{background:var(--orbit-line);border-radius:10px}.orbit-progress-group progress::-webkit-progress-value{background:var(--orbit-gradient);border-radius:10px;transition:width .4s}.orbit-progress-group progress::-moz-progress-bar{background:var(--orbit-gradient)}.orbit-xp{color:var(--orbit-muted);justify-content:flex-end;align-items:center;gap:5px;font-size:13px;display:flex}.orbit-xp svg{color:#138aa2}.orbit-lesson-meta{color:var(--orbit-muted);justify-content:space-between;align-items:center;gap:14px;padding:0 10px 12px;font-size:11px;display:flex}.orbit-lesson-meta>span{white-space:nowrap}.orbit-study .orbit-text-button{color:var(--orbit-muted);text-align:left;background:0 0;border:0;align-items:center;gap:7px;padding:8px 0;font-size:12px;display:inline-flex}.orbit-task-menu{border:1px solid var(--orbit-line);background:var(--orbit-surface);border-radius:12px;flex-wrap:wrap;gap:6px;margin:0 0 12px;padding:12px;display:flex}.orbit-task-menu button{min-height:44px;color:var(--orbit-ink);background:var(--orbit-note);border:0;border-radius:9px;align-items:center;gap:7px;padding:10px 13px;font-size:13px;display:flex}.orbit-task-menu button[aria-current]{box-shadow:inset 0 0 0 2px #2789b5}.orbit-canvas{border:1px solid var(--orbit-line);background:var(--orbit-surface);border-radius:20px;flex-direction:column;min-height:calc(100svh - 240px);transition:border-color .25s,box-shadow .3s;display:flex;position:relative}.orbit-canvas[data-result=correct]{border-color:#7acb91;box-shadow:0 0 20px #6ed68f20}.orbit-canvas[data-result=incorrect]{border-color:#dfc576;box-shadow:0 0 16px #ecd67b18}.orbit-page{overflow-wrap:anywhere;flex-direction:column;flex:1;justify-content:center;width:min(100%,600px);margin:auto;padding:55px 28px 42px;animation:.28s ease-out orbit-page-enter;display:flex}.orbit-page>h1{letter-spacing:-.6px;margin:0 0 24px;font-size:29px;line-height:1.25}.orbit-eyebrow{letter-spacing:1.2px;color:var(--orbit-muted);margin-bottom:20px;font-size:11px;font-weight:650}.orbit-page p{margin:0 0 20px;font-size:15px;line-height:1.75}.orbit-page p:last-child{margin-bottom:0}.orbit-page h2,.orbit-page h3{color:var(--orbit-ink);line-height:1.45}.orbit-page ul,.orbit-page ol{padding-left:22px;line-height:1.75}.orbit-page li{margin:8px 0}.orbit-page a{color:var(--blue)}.orbit-page .app-block-heading{margin-bottom:18px;display:flex}.orbit-page .app-orientation,.orbit-page .app-objectives{box-shadow:none;background:0 0;border:0;padding:0}.orbit-page .app-objectives{margin-top:24px}.orbit-page .app-learning-block{box-shadow:none;background:0 0;border:0;padding:0}.orbit-page .app-learning-block>h3{margin:0 0 18px;font-size:18px}.orbit-page .app-learning-block p{color:var(--orbit-ink)}.orbit-page .app-concept-icon{display:none}.orbit-page .app-example{background:var(--orbit-note);border:0;border-radius:11px;margin-bottom:20px;padding:15px 18px}.orbit-page .app-example h4{margin:0 0 10px;font-size:13px}.orbit-page .app-micro-illustration{margin-top:22px}.orbit-page .ct-picture{background:var(--orbit-surface);width:100%;max-width:100%;color:var(--orbit-ink);margin:0}.orbit-page .ct-picture-open{background:var(--orbit-surface);width:100%}.orbit-page .ct-picture-open img{object-fit:contain;width:100%;height:auto;max-height:420px}.orbit-page .ct-figure-heading span{font-size:10px}.orbit-page .ct-figure-heading h4{font-size:14px}.orbit-page .ct-picture figcaption,.orbit-page .ct-picture-transcript{color:var(--orbit-muted);font-size:12px}.orbit-page table{border-collapse:collapse;width:100%;font-size:13px}.orbit-page td,.orbit-page th{text-align:left;border-bottom:1px solid var(--orbit-line);overflow-wrap:anywhere;padding:10px}.orbit-page pre{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--orbit-note);border-radius:10px;padding:18px;font-size:13px}.orbit-page .guided-takeaway{background:var(--orbit-note);border-radius:10px;padding:16px}.orbit-page .guided-ordered-steps{padding-left:22px}.orbit-question-heading{justify-content:space-between;align-items:center;gap:14px;margin-bottom:22px;display:flex}.orbit-question-heading>span{text-transform:uppercase;letter-spacing:.6px;color:var(--orbit-muted);font-size:11px;font-weight:650}.orbit-study .orbit-hint{background:var(--orbit-note);min-height:40px;color:var(--orbit-ink);border:0;border-radius:20px;align-items:center;gap:5px;padding:8px 12px;font-size:12px;display:flex}.orbit-page .orbit-hint-copy{background:var(--orbit-note);border-radius:10px;padding:14px 16px;font-size:13px}.orbit-question .private-source-text,.orbit-question .question-content>h2{font:inherit;white-space:pre-line;margin:0 0 26px;line-height:1.7}.orbit-question .question-content{margin-bottom:24px}.orbit-answers{gap:9px;display:grid}.orbit-study .orbit-answer{text-align:left;width:100%;min-height:48px;color:var(--orbit-ink);background:var(--orbit-surface);border:1px solid var(--orbit-line);border-bottom-width:2px;border-radius:9px;align-items:center;gap:10px;padding:13px 27px 13px 16px;font-size:14px;line-height:1.55;transition:background .16s,border-color .16s;display:flex;position:relative}.orbit-answer:hover:not(:disabled){background:var(--orbit-note)}.orbit-study .orbit-answer:disabled{opacity:1}.orbit-answer[aria-pressed=true]{background:var(--orbit-note);border-color:#328ec0}.orbit-study .orbit-answer[data-result=correct]{color:var(--orbit-success);background:var(--orbit-success-fill);border-color:#6bb57c}.orbit-study .orbit-answer[data-result=incorrect]{color:var(--orbit-warning);background:var(--orbit-warning-fill);border-color:#d5b75b}.orbit-answer-mark{color:#fff;background:#d1b253;border-radius:0 6px 0 5px;place-items:center;width:16px;height:16px;display:grid;position:absolute;top:-1px;right:-1px}.orbit-answer[data-result=correct] .orbit-answer-mark{background:#59a46d}.orbit-checkbox{border:1px solid var(--orbit-muted);border-radius:4px;flex:none;place-items:center;width:16px;height:16px;display:grid}.orbit-multiple-actions{justify-content:space-between;align-items:center;gap:15px;margin-top:18px;display:flex}.orbit-multiple-actions>span{color:var(--orbit-muted);font-size:12px}.orbit-explanation{border-top:1px solid var(--orbit-line);margin-top:30px;padding-top:22px}.orbit-explanation h3{margin:0 0 12px;font-size:15px}.orbit-explanation p{white-space:pre-wrap;font-size:14px}.orbit-explanation details{font-size:13px}.orbit-explanation summary{min-height:44px;padding:12px 0;display:list-item}.orbit-explanation li{padding-bottom:15px}.orbit-explanation li>span{color:var(--orbit-muted);margin:5px 0;font-size:11px;display:block}.orbit-explanation li>p{margin-bottom:0}.orbit-footer{justify-content:center;align-items:flex-end;min-height:110px;padding:28px 24px 22px;display:flex;position:relative}.orbit-footer-actions{justify-content:center;align-items:center;gap:9px;width:340px;max-width:100%;display:flex}.orbit-study .orbit-primary{background:var(--orbit-gradient);color:#fff;border:1px solid #1467a2;border-bottom:3px solid #12577b;border-radius:25px;justify-content:center;align-items:center;gap:8px;min-height:46px;padding:11px 22px;font-size:13px;font-weight:650;display:inline-flex}.orbit-footer .orbit-primary{flex:0 230px;min-width:0}.orbit-study .orbit-primary:disabled{background:var(--orbit-note);color:var(--orbit-muted);border-color:var(--orbit-note);opacity:1}.orbit-study .orbit-why{border:0;border-bottom:2px solid var(--orbit-line);background:var(--orbit-note);min-height:46px;color:var(--orbit-ink);border-radius:24px;padding:12px 17px;font-size:13px;font-weight:650}.orbit-mascot-dock{flex-direction:column;gap:7px;max-width:175px;display:flex;position:absolute;bottom:10px;left:18px}.orbit-mascot{object-fit:contain;filter:drop-shadow(0 3px 2px #10233414);width:48px;height:60px}.orbit-mascot.is-happy{animation:.6s ease-out orbit-astronaut-hop}.orbit-speech{background:var(--orbit-warning-fill);max-width:160px;color:var(--orbit-warning);border-radius:10px 10px 10px 2px;flex-wrap:wrap;align-items:center;gap:5px;margin-left:30px;padding:9px 11px;font-size:12px;font-weight:600;display:flex}.orbit-speech[data-result=correct]{background:var(--orbit-success-fill);color:var(--orbit-success)}.orbit-speech small{white-space:nowrap;align-items:center;gap:3px;font-size:10px;display:flex}.orbit-completion{text-align:center;padding:0 0 25px}.orbit-completion h1{margin:0 0 12px;font-size:30px;line-height:1.2}.orbit-completion>p{color:var(--orbit-muted);font-size:13px}.orbit-completion-label{letter-spacing:1px;color:var(--orbit-muted);margin:30px 0 10px;font-size:10px;display:block}.orbit-completion-xp{align-items:center;gap:8px;font-size:40px;display:inline-flex}.orbit-completion-xp svg{color:#1888a0}.orbit-portal-scene{perspective:700px;width:250px;max-width:100%;height:230px;margin:auto;position:relative}.orbit-portal-ring{border:9px solid #6db4cf;border-radius:50%;width:160px;height:60px;animation:.6s both orbit-portal-in;position:absolute;top:163px;left:calc(50% - 80px);box-shadow:0 5px #357e9f,inset 0 0 20px #59c0dc55,0 0 20px #59c0dc33}.orbit-portal-beam{clip-path:polygon(0 0,100% 0,80% 100%,20% 100%);background:linear-gradient(#b4e4f000,#61b9d34d);width:160px;height:140px;position:absolute;top:50px;left:calc(50% - 80px)}.orbit-portal-scene>img{object-fit:contain;animation:1.6s .2s both orbit-astronaut-arrive;position:absolute;top:57px;left:calc(50% - 44px)}.orbit-portal-coin{color:#fff;background:linear-gradient(#9fd9f0,#2785b6);border-radius:50%;place-items:center;width:46px;height:46px;animation:.8s both orbit-portal-in;display:grid;position:absolute;top:170px;left:calc(50% - 23px);transform:rotateX(60deg);box-shadow:0 4px #16638c}@keyframes orbit-page-enter{0%{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}@keyframes orbit-astronaut-hop{0%,to{transform:translateY(0)}40%{transform:translateY(-8px)rotate(-5deg)}70%{transform:translateY(1px)rotate(3deg)}}@keyframes orbit-portal-in{0%{opacity:0;scale:.5}to{opacity:1;scale:1}}@keyframes orbit-astronaut-arrive{0%{opacity:0;transform:translateY(115px)scale(.3)}35%{opacity:1;transform:translateY(-22px)rotateY(180deg)}65%{transform:translateY(-12px)rotateY(360deg)}to{transform:translateY(0)}}@media (max-width:700px){.learner-app .orbit-study.orbit-lesson{padding:4px 10px 20px}.orbit-top{grid-template-columns:35px minmax(0,1fr) 40px;gap:7px}.orbit-xp{font-size:11px}.orbit-lesson-meta{align-items:flex-start;padding:0 4px 10px}.orbit-lesson-meta>span{padding-top:9px;font-size:10px}.orbit-lesson-meta button{font-size:11px}.orbit-canvas{border-radius:15px;min-height:620px}.orbit-page{min-height:400px;padding:32px 22px}.orbit-page>h1{font-size:25px}.orbit-footer{flex-direction:column;align-items:center;gap:12px;min-height:126px;padding:14px 16px 18px}.orbit-mascot-dock{flex-direction:row;align-self:flex-start;align-items:center;gap:8px;max-width:none;position:static}.orbit-mascot{order:-1;width:32px;height:40px}.orbit-speech{flex-wrap:wrap;max-width:none;margin:0;font-size:11px}.orbit-footer-actions{width:100%}.orbit-footer .orbit-primary{flex:1}.orbit-page .ct-picture-open img{max-height:none}}@media (prefers-reduced-motion:reduce){.orbit-study *,.orbit-study :before,.orbit-study :after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}