:root{--navy:#081e35;--blue:#145b89;--steel:#4b91bc;--ink:#142b43;--muted:#587185;--pale:#f3f8fc;--line:#c4dce9;--white:#fff;--teal:#087f83}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--pale);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Arial,sans-serif}a{color:var(--blue)}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #39a1dd;outline-offset:3px}
.shell{max-width:1330px;margin:auto;padding:0 22px 45px}.mast{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:23px 0;border-bottom:1px solid var(--line)}.brand{font-size:21px;font-weight:850;letter-spacing:.04em;color:var(--navy)}.brand em{color:var(--steel);font-style:normal}.eyebrow{font-size:12px;font-weight:850;letter-spacing:.14em;color:var(--blue)}.muted{color:var(--muted)}.pill{border:1px solid var(--line);background:#fff;border-radius:99px;padding:6px 12px;font-size:12px;color:var(--muted)}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;margin:25px 0}.heroMain{background:linear-gradient(110deg,#081e35,#175c87);color:white;border-radius:21px;padding:39px;min-height:300px}.heroMain .eyebrow{color:#8bd4f8}.hero h1{font-size:clamp(32px,4.5vw,56px);line-height:1.08;margin:18px 0}.hero p{max-width:650px;line-height:1.55}.heroSide{background:#fff;border:1px solid var(--line);border-radius:21px;padding:28px;display:flex;flex-direction:column;justify-content:space-between}.heroSide strong{font-size:26px}.progress{height:10px;border-radius:99px;background:#d8e9f3;overflow:hidden}.progress span{display:block;height:100%;background:var(--teal);width:0}.stat{display:flex;justify-content:space-between;gap:12px;align-items:end}.stat b{font-size:42px;color:var(--blue)}.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0 30px}.level{border:1px solid var(--line);background:#fff;border-radius:16px;padding:20px}.level b{font-size:28px;color:var(--blue)}.level p{color:var(--muted);margin:7px 0 0;font-size:14px;line-height:1.45}.sectionTop{display:flex;justify-content:space-between;gap:15px;align-items:center}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:17px}.course{background:white;border:1px solid var(--line);border-radius:17px;padding:20px;display:flex;flex-direction:column;gap:11px;min-height:240px}.course h3{margin:0;font-size:21px;line-height:1.23}.course p{font-size:13px;color:var(--muted);line-height:1.45;margin:0}.course .actions{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:8px}.action{background:var(--blue);color:white;text-decoration:none;padding:10px 14px;border-radius:9px;font-weight:750;font-size:13px;display:inline-block}.smallBtn{border:1px solid var(--line);background:white;border-radius:8px;padding:8px 12px;color:var(--blue);font-size:12px}.footer{font-size:12px;color:var(--muted);margin-top:36px;line-height:1.5;border-top:1px solid var(--line);padding-top:15px}
.lessonLayout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:18px;margin-top:22px}.player{min-width:0}.player img{display:block;width:100%;border:1px solid var(--line);border-radius:15px;box-shadow:0 10px 28px #18354b18}.playerControls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:13px 0}.playerControls button{background:var(--blue);color:white;border:0;border-radius:9px;padding:12px 18px;font-weight:700}.playerControls button:disabled{opacity:.35}.playerControls span{margin-left:auto;color:var(--muted)}.sidebar{background:#fff;border:1px solid var(--line);border-radius:15px;padding:17px;align-self:start}.sidebar h3{font-size:17px;margin:5px 0 15px}.sceneLink{width:100%;border:0;border-bottom:1px solid #e5eff5;background:white;text-align:left;padding:11px 4px;display:flex;gap:9px;align-items:flex-start;color:var(--ink);font-size:13px}.sceneLink.active{font-weight:800;color:var(--blue);background:#eaf5fb}.sceneLink .n{color:var(--steel);font-weight:800}.panel{border:1px solid var(--line);border-radius:14px;background:#fff;padding:18px;margin-top:16px;line-height:1.6}.panel h3{margin:0 0 10px}.panel p{margin:8px 0}.quiz label{display:block;margin:10px 0}.quiz input{accent-color:var(--blue)}.quiz button{background:var(--blue);border:0;border-radius:8px;color:white;padding:10px 15px;font-weight:700}.notice{background:#e8f5f8;border-left:4px solid var(--teal);padding:12px 15px;font-size:13px}.audio{width:100%;margin:10px 0}.back{display:inline-flex;gap:8px;text-decoration:none;align-items:center;margin:15px 0}.tiny{font-size:12px;color:var(--muted)}
@media(max-width:900px){.hero{grid-template-columns:1fr}.cards{grid-template-columns:repeat(2,1fr)}.lessonLayout{grid-template-columns:1fr}.sidebar{order:-1}.sceneList{display:flex;gap:6px;overflow:auto}.sceneLink{min-width:170px;border:1px solid var(--line);border-radius:8px;padding:10px}}
@media(max-width:600px){.shell{padding:0 12px 35px}.mast{align-items:start;flex-direction:column}.heroMain{padding:25px;min-height:260px}.heroSide{min-height:200px}.levels{grid-template-columns:1fr}.cards{grid-template-columns:1fr}.sectionTop{align-items:start;flex-direction:column}.playerControls span{margin-left:0}.lessonLayout{gap:5px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Review fixes: contain the existing mobile scene strip inside the viewport. */
.lessonLayout>*{min-width:0}.sceneList{max-width:100%}.sidebar{min-width:0}.panel,.course,.heroSide{overflow-wrap:anywhere}
.sectionHeading{font-size:17px;line-height:1.3;margin:5px 0 15px}.level .sectionHeading{font-size:18px;margin:1em 0}
.quiz label{min-height:44px;display:flex;align-items:center;gap:8px}.quiz input{flex-shrink:0;width:18px;height:18px}
.smallBtn,.action,.back,summary{min-height:44px}.back,summary{align-content:center}
input:focus-visible,summary:focus-visible{outline:3px solid #145b89;outline-offset:3px}
.skip{position:absolute;top:-100px;left:12px;background:#fff;padding:12px;z-index:10}.skip:focus{top:8px}
#mainContent{scroll-margin-top:12px}#progressStatus:empty{display:none}
button{min-height:44px}button:focus-visible,a:focus-visible{outline-color:#145b89}

.level{text-decoration:none;color:var(--ink)}.level[aria-current=page]{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue)}#courseLibrary{scroll-margin-top:12px}
.player img{height:auto;aspect-ratio:16/9}

/* Live-text learning slides preserve the Academy palette and original scene art. */
.learningSlide{border:1px solid var(--line);border-radius:15px;overflow:hidden;background:#f7fbff;box-shadow:0 10px 28px #18354b18}
.slideMast{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;background:var(--navy);color:#fff;padding:20px 24px;font-size:13px;font-weight:750;letter-spacing:.05em}.slideMast b{color:#8bd4f8}
.slideContent{padding:25px}.slideContent>h2{font-size:30px;line-height:1.15;color:var(--navy);margin:0 0 10px}.slideContent>p:not(.slideFoot){color:var(--muted);line-height:1.5;margin:0 0 22px}
.subjectCards{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}.subjectCard{font:inherit;line-height:1.5;text-align:left;color:var(--ink);background:#fff;border:1px solid #adcddd;border-top:4px solid #b6d6e8;border-radius:12px;padding:18px;min-width:0;overflow-wrap:anywhere;align-self:stretch}.subjectCard[aria-pressed=true]{border-color:#145b89;border-top-color:#145b89;box-shadow:0 0 0 1px #145b89;background:#edf7fe}.subjectTitle{display:block;font-size:18px;font-weight:750;line-height:1.3;margin-bottom:12px}.subjectExplanation{display:block;font-size:15px;line-height:1.55}
.slideFoot{border-top:1px solid var(--line);padding-top:14px;margin:22px 0 0;font-size:11px;line-height:1.5;color:var(--muted)}
.subjectControls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:14px 0}.subjectControls button{font:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--blue)}.subjectControls button:disabled{opacity:.4;cursor:default}.subjectControls span{font-size:13px;color:var(--muted)}
.subjectReading{background:#edf7fe;border-left:4px solid var(--blue);padding:15px;margin:12px 0 20px}.subjectReading h3{font-size:18px;line-height:1.3;margin:0 0 8px}.subjectReading p:last-child{line-height:1.65;font-size:16px}.originalScene{margin-top:18px}.originalScene img{margin-top:12px}
@media(max-width:600px){.slideContent{padding:18px}.slideContent>h2{font-size:25px}.subjectCards{grid-template-columns:1fr}.subjectCard{padding:16px}.slideMast{padding:16px}}

/* Local pilot candidate: shared navy identity, quiet reading surfaces. */
:root{color-scheme:dark;--navy:#071827;--blue:#8bd5fa;--steel:#9bc7df;--ink:#e6f0f7;--muted:#b7c9d7;--pale:#081b2b;--line:#36546a;--white:#112a3c;--teal:#72d1c8}
.heroMain{background:linear-gradient(110deg,#0b253a,#15435c)}
.heroSide,.level,.course,.sidebar,.panel,.smallBtn,.subjectControls button{background:#10283a;color:var(--ink)}
.pill{background:#10283a;color:var(--muted)}
.heroSide strong,.brand,.slideContent>h2{color:var(--ink)}
.action,.playerControls button,.quiz button{background:#81c7ee;color:#071827}
.progress{background:#234254}.progress span{background:var(--teal)}
.sceneLink{background:transparent;border-color:var(--line)}
.sceneLink.active{background:#1c4057}.sceneLink .n{color:#b6e1fa}
.learningSlide{background:#0b2132;box-shadow:none}.slideMast{background:#061622}
.subjectCard{background:#102b40;border-color:#3e6077;border-top-color:#557e97}
.subjectCard[aria-pressed=true]{background:#1c4057;border-color:#91d6fa;box-shadow:0 0 0 1px #91d6fa}
.subjectReading{background:#132f45;border-color:#8bd5fa}.notice{background:#11353d;color:#d6eff1}
.skip{background:#173d56;color:#fff}
button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline-color:#a7e5ff}
.narrationDock{border:1px solid var(--line);border-radius:12px;padding:14px;margin:14px 0;background:#112d42}
.narrationDock p{margin:6px 0;font-size:14px;line-height:1.5}.narrationDock audio{display:block;width:100%;margin-top:12px}
.narrationButtons{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.narrationButtons button{background:#81c7ee;color:#071827;border:0;border-radius:8px;padding:10px 14px;font-weight:650}
.narrationButtons button:disabled{opacity:.5;cursor:default}
.sequenceOption{display:flex;align-items:center;gap:8px;min-height:44px;font-size:14px}
.lessonPurpose{border-left:3px solid #72d1c8;padding:8px 14px;margin:18px 0;color:var(--muted)}.lessonPurpose p{margin:5px 0;line-height:1.5}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* A distinct lesson player, with one shared stage and a clear transport footer. */
.lessonPlayer{border:1px solid #426d85;border-radius:18px;overflow:hidden;background:#0a2031;box-shadow:0 18px 44px #0003}
.playerBanner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;background:linear-gradient(110deg,#123d55,#0b2539);border-bottom:1px solid #426d85}
.playerBanner .eyebrow{color:#a3d9ec;font-size:10px;letter-spacing:.16em}.playerBanner h2{margin:5px 0 0;font-size:24px;letter-spacing:-.025em}
.recordingState{display:inline-block;max-width:220px;padding:7px 10px;border:1px solid #557b92;border-radius:6px;font-size:12px;font-weight:650;color:#c7deeb;background:#0b2436}
.lessonPlayer .learningSlide{border:0;border-radius:0;box-shadow:none}.lessonPlayer .slideMast{padding:12px 24px;font-size:11px;background:#091b29;border-bottom:1px solid #29495f}
.lessonPlayer .narrationDock{margin:0;border:0;border-top:1px solid #426d85;border-radius:0;background:linear-gradient(135deg,#12354c,#0c2437);padding:22px 24px}
.nowReading .eyebrow{font-size:10px;color:#9bcee6;letter-spacing:.13em}.nowReading h3{font-size:23px;line-height:1.25;margin:7px 0;color:#edf7fd}
.narrationDock .narrationButtons{align-items:center;gap:10px;margin:18px 0}.narrationButtons .primaryPlay{display:inline-flex;align-items:center;gap:12px;padding:8px 20px 8px 8px;border-radius:40px;background:#a6e3ff;font-size:15px;font-weight:750}
.playDisc{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#0a2e45;color:#b9edff}
.narrationButtons button:not(.primaryPlay){background:transparent;color:#d0e8f6;border:1px solid #6389a0;padding:10px 16px}
.narrationButtons .primaryPlay:disabled{opacity:1;background:#385b70;color:#d9e6ef;cursor:default}.primaryPlay:disabled .playDisc{background:#1d4055;color:#afc5d3}
.subjectTrack{display:flex;gap:8px;list-style:none;margin:20px 0 12px;padding:0}.subjectTrack li{display:flex;align-items:center;gap:8px;flex:1;min-width:0;border-top:3px solid #4f6c80;padding-top:10px;color:#bacdda}
.subjectTrack li[aria-current=step]{border-top-color:#8bdafb;color:#ecf9ff}.trackNumber{display:grid;place-items:center;border:1px solid #7297ad;border-radius:50%;width:24px;height:24px;flex-shrink:0;font-size:11px;font-weight:750}.subjectTrack li[aria-current=step] .trackNumber{color:#082336;background:#9edffc;border-color:#9edffc}.trackTitle{font-size:11px;line-height:1.3;overflow-wrap:anywhere}
.narrationDock .subjectControls{padding-top:10px;gap:8px}.narrationDock .subjectControls button{background:#14374e;border-color:#668ba1;font-size:12px;padding:8px 10px}.narrationDock .subjectControls span{margin-left:auto}
.narrationDock .sequenceOption{font-size:12px;margin-top:2px}.narrationDock .tiny{font-size:11px;color:#b9cdda}
@media(max-width:600px){.playerBanner{padding:17px;align-items:flex-start;flex-direction:column;gap:10px}.playerBanner h2{font-size:23px}.recordingState{max-width:none;font-size:11px}.lessonPlayer .slideMast{padding:12px 17px}.lessonPlayer .narrationDock{padding:20px 17px}.nowReading h3{font-size:21px}.narrationButtons .primaryPlay{flex-basis:100%;justify-content:center}.trackTitle{display:none}.subjectTrack li{justify-content:center}.narrationDock .subjectControls span{margin-left:0;flex-basis:100%;margin-top:4px}}

/* Key items on the stage; the full explanation stays in narration/transcript. */
.subjectExplanation{font-size:14px;line-height:1.5}
.subjectBullet{display:block;position:relative;padding-left:14px;margin:0 0 10px}
.subjectBullet:last-child{margin-bottom:0}
.subjectBullet::before{content:'•';position:absolute;left:0;color:#9edffc}
#subjectTranscriptDetails summary{font-size:14px;color:#b5e6ff;cursor:pointer}
#subjectTranscriptDetails[open] summary{margin-bottom:12px}

/* Shared student shell; elective sessions reuse the existing scene player. */
.sessionNavigation{display:flex;gap:12px;align-items:center;margin:14px 0 20px}.sessionNavigation[hidden]{display:none}.sessionNavigation label{font-size:13px;font-weight:700}.sessionNavigation select{min-width:0;max-width:100%;min-height:44px;background:#10283a;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:9px 12px;font:inherit}.sessionNavigation select:focus-visible{outline:3px solid #a5e7ff;outline-offset:3px}.electiveLevel b{color:#e4bd77}
@media(min-width:1101px){.levels{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(min-width:601px)and(max-width:1100px){.levels{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.sessionNavigation{align-items:stretch;flex-direction:column}.sessionNavigation select{width:100%}}

#relatedCourses a{display:block;padding:10px 0;min-height:44px;box-sizing:border-box;font-size:14px}