:root{--ink:#12213f;--muted:#637083;--blue:#1f57d6;--navy:#0b1730;--line:#e4e8ef;--bg:#f6f8fc;--green:#087a55;--purple:#7137c8;--gold:#a26a00}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{text-decoration:none;color:inherit}.wrap{width:min(1180px,92vw);margin:auto}.narrow{width:min(900px,92vw)}
header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{min-height:72px;display:flex;align-items:center;gap:28px}.brand{font-weight:850;letter-spacing:-.03em}.brand span{font-size:.62rem;background:#edf2ff;color:var(--blue);padding:3px 6px;border-radius:20px;margin-left:5px}.nav nav{display:flex;gap:22px;margin-left:auto;color:#39475d;font-size:.94rem}.actions{display:flex;align-items:center;gap:8px}.ghost{border:0;background:none;padding:10px;color:#475467}.btn{display:inline-flex;padding:12px 18px;border-radius:10px;background:var(--blue);color:#fff;border:1px solid var(--blue);font-weight:780;justify-content:center}.btn.small{padding:9px 13px}.btn.secondary{background:#fff;color:var(--ink);border-color:#cbd3df}
.hero{background:linear-gradient(180deg,#fff,#f2f6ff);padding:70px 0;border-bottom:1px solid var(--line)}.heroGrid{display:grid;grid-template-columns:1.03fr .97fr;gap:56px;align-items:center}.kicker{text-transform:uppercase;letter-spacing:.13em;font-size:.74rem;font-weight:850;color:var(--blue)}h1{font-size:clamp(2.6rem,5vw,4.8rem);line-height:1.01;letter-spacing:-.058em;margin:12px 0 20px}h1 em{font-style:normal;color:var(--blue)}h2{font-size:clamp(1.8rem,3.2vw,2.65rem);line-height:1.1;letter-spacing:-.045em;margin:9px 0 24px}h3{letter-spacing:-.025em}.lead{color:var(--muted);font-size:1.07rem;line-height:1.7;max-width:760px}.buttons{display:flex;gap:12px;flex-wrap:wrap;margin:27px 0}.credibility{border-top:1px solid var(--line);padding-top:19px;display:grid;gap:5px;font-size:.86rem}.credibility span{color:var(--muted)}
.scienceMosaic{min-height:430px;display:grid;grid-template-columns:1.2fr .8fr;grid-template-rows:1fr 1fr 1fr;gap:10px;position:relative}.tile{border-radius:17px;border:1px solid #dbe2ee;background:#fff;padding:18px;overflow:hidden;position:relative;display:flex;flex-direction:column;justify-content:flex-end;min-height:125px}.tile span{font-size:.75rem;color:#697586;margin-top:3px}.institute{background:linear-gradient(135deg,#10234a,#1d4c9a);color:#fff}.institute span{color:#cbd9f7}.lattice{grid-row:span 2;background:#edf3ff}.atoms{position:absolute;inset:14px 14px 44px;background-image:radial-gradient(circle,#2457d6 0 5px,transparent 6px);background-size:42px 42px;animation:phonon 1.7s ease-in-out infinite alternate}.scientist{background:#f8f3e8}.portrait{position:absolute;right:18px;top:10px;font-family:Georgia,serif;font-size:5rem;color:#c59b4b;opacity:.5}.university{background:#f2f6f5}.wave{background:#0d1933;color:white}.waveLine{position:absolute;top:17px;left:18px;font-size:2.5rem;color:#7ca6ff;letter-spacing:4px;animation:wave 1.8s ease-in-out infinite alternate}.mosaicNote{position:absolute;right:8px;bottom:-29px;font-size:.64rem;color:#8993a2}@keyframes phonon{from{transform:translateX(-3px) scale(.99)}to{transform:translateX(5px) scale(1.01)}}@keyframes wave{from{transform:translateX(-4px)}to{transform:translateX(9px)}}
.problem{background:var(--navy);color:white;padding:64px 0}.problem .kicker{color:#8fb2ff}.problemGrid{display:grid;grid-template-columns:1fr 1fr;gap:55px;align-items:center}.problemText{color:#c9d2e3;line-height:1.75;font-size:1.05rem}.learningFlow{display:grid;grid-template-columns:repeat(5,1fr);margin-top:32px;border:1px solid #263754;border-radius:15px;overflow:hidden}.learningFlow>div{padding:18px;border-right:1px solid #263754;display:grid;gap:4px}.learningFlow>div:last-child{border:0}.learningFlow span{color:#8fb2ff;font-size:.72rem;font-weight:850}.learningFlow small{color:#9eacc1}
.section{padding:70px 0}.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.pathGrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.pathCard{background:white;border:1px solid var(--line);border-radius:16px;padding:23px;min-height:205px}.pathCard p,.sectionHead p,.card p{color:var(--muted);line-height:1.55}.pathTag{font-size:.68rem;font-weight:850;color:var(--blue);letter-spacing:.12em}.future{background:#fbfcff;border-style:dashed}
.progressGrid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.masteryCard{margin-top:25px;background:#f8faff;border:1px solid #dfe6f2;border-radius:16px;padding:21px}.masteryTop{display:flex;justify-content:space-between}.masteryTop strong{color:var(--blue)}.bar{height:9px;background:#e6ebf3;border-radius:20px;margin:14px 0}.bar i{display:block;height:100%;background:var(--blue);border-radius:20px}.checklist{display:grid;grid-template-columns:1fr 1fr;gap:8px;font-size:.84rem;color:#526074}.conversionCard{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:white}.conversionCard>div{padding:25px;display:flex;flex-direction:column;gap:12px}.proSide{background:#f8f5ff;border-left:1px solid #e4dcf5}.pill{align-self:flex-start;border-radius:20px;padding:5px 8px;font-size:.69rem;font-weight:850}.pill.free{background:#e8f8f1;color:var(--green)}.pill.pro{background:#eee6fb;color:var(--purple)}
.sectionHead{display:flex;justify-content:space-between;gap:40px;align-items:end}.sectionHead p{max-width:450px}.filters{display:grid;grid-template-columns:1fr 190px 150px;gap:11px;margin:26px 0}.filters input,.filters select{border:1px solid #d3dae5;border-radius:10px;padding:12px 14px;background:white;font:inherit;color:var(--ink)}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:19px}.card{background:#fff;border:1px solid var(--line);border-radius:17px;overflow:hidden;transition:.2s}.card:hover{transform:translateY(-3px);box-shadow:0 16px 35px rgba(14,28,54,.08)}.thumb{height:132px;background:linear-gradient(135deg,#edf3ff,#fafcff);padding:15px;display:flex;justify-content:space-between;align-items:flex-start}.badge,.subject{border-radius:20px;padding:6px 9px;font-size:.69rem;font-weight:850}.badge.free{background:#e8f8f1;color:var(--green)}.badge.pro{background:#eee6fb;color:var(--purple)}.subject{background:#fff;border:1px solid var(--line);color:#4e5b70}.cardBody{padding:19px}.sub{font-size:.71rem;text-transform:uppercase;letter-spacing:.1em;font-weight:850;color:var(--blue)}.cardBody h3{margin:7px 0}.miniOffer{display:flex;gap:7px;flex-wrap:wrap;margin-top:13px}.miniOffer span{background:#f5f7fa;border:1px solid var(--line);padding:5px 7px;border-radius:7px;font-size:.72rem;color:#59677b}.meta{border-top:1px solid var(--line);margin-top:15px;padding-top:12px;display:flex;justify-content:space-between;gap:8px;color:#6a7687;font-size:.75rem}.open{display:inline-block;color:var(--blue);font-weight:780;margin-top:14px;cursor:pointer}
.module{background:#f8fafc}.hidden{display:none}.back{border:0;background:none;color:var(--blue);font-weight:780;cursor:pointer;padding:0 0 22px}.moduleTop{padding-bottom:28px;border-bottom:1px solid var(--line)}.moduleTop h1{font-size:clamp(2.3rem,5vw,4rem)}.learnBlock{display:grid;grid-template-columns:55px 1fr;gap:22px;padding:36px 0;border-bottom:1px solid var(--line)}.num{font-size:.76rem;font-weight:850;color:#98a2b3}.placeholder{min-height:180px;background:white;border:1px dashed #c5cedb;border-radius:15px;display:grid;place-items:center;text-align:center;color:#697586;padding:22px;margin-top:16px}.accessSplit{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:35px}.accessSplit>div{background:white;border:1px solid var(--line);border-radius:16px;padding:23px}.proBox{box-shadow:inset 0 3px 0 var(--purple)}
footer{background:#0d172b;color:#e7ebf1;padding:40px 0}.footerGrid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:25px}footer p{color:#9ba8ba}
@media(max-width:900px){.nav nav{display:none}.heroGrid,.problemGrid,.progressGrid{grid-template-columns:1fr}.scienceMosaic{min-height:390px}.pathGrid,.cards{grid-template-columns:repeat(2,1fr)}.learningFlow{grid-template-columns:repeat(5,1fr);overflow:auto}.sectionHead{display:block}}
@media(max-width:620px){.actions .ghost{display:none}.hero{padding-top:45px}.scienceMosaic{grid-template-columns:1fr 1fr}.pathGrid,.cards,.conversionCard,.accessSplit,.footerGrid{grid-template-columns:1fr}.proSide{border-left:0;border-top:1px solid #e4dcf5}.filters{grid-template-columns:1fr}.learningFlow{grid-template-columns:1fr}.learningFlow>div{border-right:0;border-bottom:1px solid #263754}.checklist{grid-template-columns:1fr}.learnBlock{grid-template-columns:1fr}.num{display:none}.section{padding:52px 0}}

/* V3: compact, student-facing, mobile-complete additions */
.compactProblem{padding:38px 0}.diagnosticCard{background:#132443;border:1px solid #2b4065;border-radius:15px;padding:18px}.diagnosticCard p{color:#c9d2e3;line-height:1.5}.methodStrip{margin-top:22px;border-top:1px solid #273957;padding-top:16px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;font-size:.8rem}.methodStrip span{color:#7f91ad}
.compactPaths{background:#fff;border-bottom:1px solid var(--line);padding:24px 0}.compactPathInner{display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center}.compactPathInner h2{font-size:1.4rem;margin:5px 0}.examButtons{display:flex;gap:8px;flex-wrap:wrap}.examButtons button{background:#f7f9fd;border:1px solid #d7deea;border-radius:10px;padding:11px 14px;font-weight:820;color:var(--ink);cursor:pointer}.examButtons button:hover{border-color:var(--blue);color:var(--blue)}
.trySection{padding:46px 0;background:#f6f8fc;border-bottom:1px solid var(--line)}.tryGrid{display:grid;grid-template-columns:.85fr 1.15fr;gap:34px;align-items:center}.tryRule{font-size:1.03rem;margin:16px 0}.microQuestion{background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px}.answerRow{display:flex;gap:7px;flex-wrap:wrap;margin-top:11px}.answerRow button{border:1px solid #cfd7e4;background:#fff;border-radius:8px;padding:9px 11px;cursor:pointer}.answerRow button.correct{border-color:#0a8a5b;background:#eaf8f2;color:#086845}.answerRow button.wrong{border-color:#b74b4b;background:#fff1f1}.feedback{font-size:.81rem;margin-top:9px;min-height:18px;font-weight:700}
.miniSim{background:#fff;border:1px solid #dce3ee;border-radius:18px;padding:18px;box-shadow:0 16px 35px rgba(14,28,54,.06)}.simTop{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:11px;margin-bottom:14px}.simTop span{font-size:.75rem;color:var(--blue);font-weight:800}.miniSim label{font-size:.85rem}.miniSim input[type=range]{width:100%;margin:12px 0 17px}.simPanel{display:grid;grid-template-columns:1fr 1fr;gap:14px}.simPanel>div{background:#f8faff;border:1px solid #e3e8f1;border-radius:13px;padding:13px;min-height:150px}.simPanel small{font-weight:850;color:#718096;letter-spacing:.1em}.simPanel p{font-size:.74rem;color:#6b7688}.realLattice{height:60px;margin-top:14px;position:relative}.atomDot{width:13px;height:13px;border-radius:50%;background:var(--blue);position:absolute;top:22px;transform:translateX(-50%)}.bzAxis{height:65px;margin-top:12px;display:flex;align-items:center;justify-content:center;font-size:.65rem;color:#657184}.bzZone{height:42px;width:150px;border-left:3px solid var(--blue);border-right:3px solid var(--blue);background:#e7efff;display:grid;place-items:center;margin:0 6px;transition:width .12s}.bzZone i{font-style:normal;font-size:.69rem;font-weight:800;color:var(--blue)}
@media(max-width:900px){.compactPathInner,.tryGrid{grid-template-columns:1fr}.examButtons{justify-content:flex-start}}
@media(max-width:620px){.hero{padding:30px 0}.heroGrid{gap:24px}.problem{padding:29px 0}.methodStrip{gap:7px;font-size:.7rem}.compactPaths{padding:18px 0}.examButtons{display:grid;grid-template-columns:1fr 1fr;width:100%}.trySection{padding:32px 0}.tryGrid{gap:22px}.simPanel{grid-template-columns:1fr}.answerRow{display:grid}.answerRow button{min-height:44px}.buttons{display:grid}}

/* V3.1 — reusable real-content modules and cleaner mastery */
.masteryTop>div{display:flex;flex-direction:column;gap:2px}.masteryTop small{font-size:.7rem;color:#7b8798;font-weight:700}.masteryRows{display:grid;gap:8px;margin-top:13px}.masteryRows>div{display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:8px;padding:8px 0;border-top:1px solid #e6ebf3;font-size:.82rem}.masteryRows em{font-style:normal;color:#6b7688;font-size:.76rem}.state{display:grid;place-items:center;width:21px;height:21px;border-radius:50%;background:#eef1f5;color:#6a7687;font-size:.72rem}.state.done{background:#e8f7f0;color:#087a55}.state.active{background:#edf3ff;color:#1f57d6}.nextStep{margin-top:14px;background:#eef4ff;border-radius:11px;padding:12px;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;font-size:.78rem}.nextStep span{color:#52647d;text-transform:uppercase;letter-spacing:.08em;font-weight:850}.nextStep a{color:var(--blue);font-weight:850}
.moduleEyebrow{display:flex;align-items:center;gap:10px;color:#657184;font-size:.78rem}.moduleTagline{font-size:1.15rem;line-height:1.55;color:#536176;max-width:760px}.goalBox{margin-top:20px;padding:15px 17px;background:#eef4ff;border-left:4px solid var(--blue);border-radius:10px;display:grid;gap:4px}.goalBox span{color:#52647d;line-height:1.5}.modulePath{position:sticky;top:69px;z-index:15;background:rgba(248,250,252,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);padding:13px 0;display:flex;justify-content:center;gap:10px;flex-wrap:wrap;font-size:.77rem;font-weight:800}.modulePath a{color:var(--blue)}.modulePath span{color:#9aa5b4}.moduleSection{padding:38px 0;border-bottom:1px solid var(--line)}.sectionIntro{color:#667386;line-height:1.6;max-width:760px}.questionStack{display:grid;gap:14px;margin-top:20px}.quizCard{background:#fff;border:1px solid #dfe5ef;border-radius:15px;padding:18px}.qLabel{text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-size:.68rem;font-weight:850}.quizCard h3{font-size:1rem;line-height:1.45;margin:8px 0 13px}.quizChoices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.quizChoices button{border:1px solid #ccd5e1;background:#fff;color:var(--ink);border-radius:9px;text-align:left;padding:11px 12px;cursor:pointer}.quizChoices button:hover:not(:disabled){border-color:var(--blue);background:#f5f8ff}.quizChoices button.correct{border-color:#0a8a5b;background:#eaf8f2;color:#086845}.quizChoices button.wrong{border-color:#b74b4b;background:#fff1f1;color:#8f3333}.quizWhy{margin-top:12px;padding:11px 12px;border-radius:9px;background:#f6f8fb;color:#536176;line-height:1.5;font-size:.83rem}.conceptSteps{display:grid;gap:12px;margin-top:18px}.conceptStep{display:grid;grid-template-columns:44px 1fr;gap:14px;background:#fff;border:1px solid #e1e6ee;border-radius:14px;padding:16px}.stepNo{font-weight:900;color:#9aa7ba;font-size:.8rem}.conceptStep h3{margin:0 0 5px}.conceptStep p{margin:0;color:#627084;line-height:1.58}.equationGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.equationCard{background:#101c35;color:#fff;border-radius:11px;padding:16px;text-align:center;font-family:Georgia,serif;font-size:1.04rem}.embeddedSim{background:#fff;border:1px solid #dce3ee;border-radius:17px;padding:18px;margin-top:18px}.embeddedSim input[type=range]{width:100%;margin:12px 0 16px}.observationPrompt{margin-top:12px;padding:11px 13px;background:#fff8e8;border-radius:9px;color:#6f5a1e;font-size:.82rem}.practiceSummary{margin-top:14px;background:#eef4ff;border-radius:10px;padding:13px;color:#44546c}.masteryLogic{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:18px 0}.masteryLogic>div{background:#fff;border:1px solid #e0e5ed;border-radius:11px;padding:13px;display:flex;justify-content:space-between;gap:10px}.masteryLogic span{font-size:.8rem;color:#5d6b7f}.masteryLogic b{color:var(--blue)}.nextModuleBox{margin-top:18px;background:#101c35;color:#fff;border-radius:14px;padding:18px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:13px}.nextModuleBox span{color:#c3cee0;font-size:.84rem}.topicPreview{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;margin:25px 0}
@media(max-width:700px){.nextStep{grid-template-columns:1fr}.quizChoices{grid-template-columns:1fr}.equationGrid,.masteryLogic{grid-template-columns:1fr}.conceptStep{grid-template-columns:1fr}.nextModuleBox{grid-template-columns:1fr}.modulePath{top:62px;justify-content:flex-start;overflow-x:auto;flex-wrap:nowrap;padding-left:3vw;padding-right:3vw}.modulePath span{display:none}}
/* V3.2 — real academic/scientist imagery in hero mosaic */
.photoMosaic{grid-template-columns:repeat(3,1fr);grid-template-rows:175px 175px;gap:9px;min-height:auto}.photoTile{margin:0;position:relative;border-radius:15px;overflow:hidden;border:1px solid #dbe2ee;background:#0d1933;min-height:0}.photoTile.wide{grid-column:span 1}.photoTile img{width:100%;height:100%;object-fit:cover;display:block;filter:saturate(.92) contrast(1.02);transition:transform .35s ease,filter .35s ease}.photoTile:hover img{transform:scale(1.035);filter:saturate(1.04) contrast(1.03)}.photoTile:after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(5,12,28,.82) 0%,rgba(5,12,28,.24) 48%,rgba(5,12,28,.04) 72%);pointer-events:none}.photoTile figcaption{position:absolute;z-index:2;left:13px;right:12px;bottom:11px;display:flex;flex-direction:column;color:#fff;text-shadow:0 1px 5px rgba(0,0,0,.35)}.photoTile figcaption b{font-size:.88rem}.photoTile figcaption span{font-size:.66rem;line-height:1.3;color:#e4eaf5;margin-top:2px}.scientistPhoto img{object-position:center 20%}.imageCredits{margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,.1);color:#7f8ca0;font-size:.65rem;line-height:1.45}
@media(max-width:900px){.photoMosaic{grid-template-columns:repeat(3,1fr);grid-template-rows:150px 150px}}
@media(max-width:620px){.photoMosaic{grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(3,135px);gap:7px}.photoTile figcaption b{font-size:.8rem}.photoTile figcaption span{font-size:.61rem}.scienceMosaic{min-height:auto}}

/* V3.3 dedicated student module page */
.moduleLaunch{display:block;text-align:center;margin-top:14px}
.modulePageBody{background:#f8fafc}
.modulePage{min-height:75vh}
.moduleHero{padding:48px 0 24px;background:linear-gradient(180deg,#eef4ff 0%,#f8fafc 100%);border-bottom:1px solid var(--line)}
.moduleHero h1{font-size:clamp(2.2rem,5vw,4.2rem);line-height:1.02;margin:16px 0 12px;letter-spacing:-.04em}
.backLink{display:inline-block;margin-bottom:16px;color:#5b6880;font-weight:750;font-size:.82rem}
.examTagRow{display:flex;gap:7px;flex-wrap:wrap;margin-top:14px}.examTagRow span{background:#fff;border:1px solid #dce3ee;border-radius:999px;padding:6px 10px;font-size:.72rem;font-weight:800;color:#526079}
.modulePathPage{top:69px;margin:0 calc(50% - 50vw);padding-left:max(3vw,calc((100vw - 860px)/2));padding-right:max(3vw,calc((100vw - 860px)/2))}
.moduleIntroStrip{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:22px 0 6px}.moduleIntroStrip>div{background:#fff;border:1px solid #e1e7ef;border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:3px}.moduleIntroStrip b{font-size:1rem}.moduleIntroStrip span{font-size:.72rem;color:#718096}
.rememberBox{margin-top:18px;padding:15px 17px;border-radius:12px;background:#fff8e8;border:1px solid #f0dfb5;display:grid;gap:4px}.rememberBox b{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:#856918}.rememberBox span{color:#66562e}
.moduleLoading{padding:40px 0;color:#69778c}
.moduleHome{text-decoration:none}
@media(max-width:700px){.moduleIntroStrip{grid-template-columns:repeat(2,1fr)}.moduleHero{padding-top:28px}.modulePathPage{margin:0 -3vw;padding-left:3vw;padding-right:3vw}}

/* V3.5 Advanced / Pro interactive lab */
.advancedLabSection{position:relative}
.advancedHeader{display:grid;grid-template-columns:1.35fr .85fr;gap:20px;align-items:start}
.advancedTitleRow{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.advancedTitleRow h2{margin-bottom:6px}
.proPill{display:inline-flex;align-items:center;background:#19162d;color:#fff1ad;border:1px solid #514a73;border-radius:999px;padding:5px 9px;font-size:.68rem;font-weight:900;letter-spacing:.1em}
.advancedFeatureCard{background:#111b32;color:#fff;border-radius:14px;padding:17px}.advancedFeatureCard b{font-size:.82rem}.advancedFeatureCard ul{margin:10px 0 0;padding-left:18px;color:#c9d4e5;font-size:.78rem;line-height:1.55}
.proPreviewNote{margin:18px 0 13px;border:1px solid #e9d991;background:#fff9de;border-radius:11px;padding:12px 14px;display:grid;gap:3px}.proPreviewNote b{font-size:.8rem;color:#6f5b13}.proPreviewNote span{font-size:.76rem;color:#75672f;line-height:1.45}
.advancedLabShell{display:grid;grid-template-columns:245px 1fr;border:1px solid #dce3ed;background:#fff;border-radius:18px;overflow:hidden;box-shadow:0 14px 35px rgba(20,35,60,.06)}
.advancedControls{background:#f5f7fb;border-right:1px solid #e0e5ed;padding:17px;display:grid;gap:15px;align-content:start}
.advancedControls label{display:grid;gap:7px;font-size:.75rem;font-weight:800;color:#4f5e73}.advancedControls label strong{color:#1f57d6}
.advancedControls select,.advancedControls input[type=range]{width:100%}.advancedControls select{border:1px solid #ccd5e1;border-radius:8px;background:#fff;padding:8px;color:#24324a}
.checkLine{grid-template-columns:auto 1fr!important;align-items:center}.checkLine input{margin:0}
.controlHint{background:#eaf0ff;border-radius:10px;padding:11px;display:grid;gap:4px;font-size:.72rem;line-height:1.42;color:#4e5e78}
.advancedViz{padding:16px;min-width:0}.labPlots{display:grid;grid-template-columns:1fr 1fr;gap:12px}.plotCard{border:1px solid #e1e6ee;border-radius:12px;overflow:hidden;background:#fff}.plotTitle{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:10px 12px;border-bottom:1px solid #e8ecf2}.plotTitle b{font-size:.78rem}.plotTitle span{font-size:.61rem;color:#8290a3;letter-spacing:.09em;font-weight:850}
.plotCard canvas{display:block;width:100%;height:auto;aspect-ratio:620/460}
.labMetrics{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}.labMetrics>div{border:1px solid #e1e6ee;border-radius:10px;padding:10px;display:grid;gap:2px}.labMetrics span{font-size:.65rem;color:#758298}.labMetrics b{font-size:.85rem}
.equationStrip{display:flex;gap:9px;flex-wrap:wrap;margin-top:10px}.equationStrip span{background:#101c35;color:#fff;border-radius:8px;padding:8px 11px;font-family:Georgia,serif;font-size:.84rem}
.labInsight{margin-top:10px;background:#eef4ff;border-radius:9px;padding:11px 12px;color:#52647d;font-size:.78rem;line-height:1.48}
@media(max-width:900px){.advancedLabShell{grid-template-columns:1fr}.advancedControls{border-right:0;border-bottom:1px solid #e0e5ed;grid-template-columns:repeat(2,1fr)}.controlHint{grid-column:1/-1}.advancedHeader{grid-template-columns:1fr}}
@media(max-width:700px){.advancedControls{grid-template-columns:1fr}.labPlots{grid-template-columns:1fr}.labMetrics{grid-template-columns:repeat(2,1fr)}.advancedTitleRow h2{font-size:1.6rem}}

/* V3.6 reusable test + evidence-based mastery engine */
.liveMasteryCard{margin-top:18px;background:#fff;border:1px solid #dfe5ee;border-radius:16px;padding:18px}
.liveMasteryTop{display:flex;justify-content:space-between;gap:18px;align-items:end}.liveMasteryTop>div{display:grid;gap:3px}.liveMasteryTop span{font-size:.7rem;text-transform:uppercase;letter-spacing:.09em;color:#758297;font-weight:850}.liveMasteryTop b{font-size:1.05rem}.liveMasteryTop strong{font-size:2rem;color:var(--blue)}
.bar.large{height:11px;margin:13px 0 16px}.masteryEvidence{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.masteryEvidence>div{background:#f6f8fb;border-radius:10px;padding:11px;display:flex;justify-content:space-between;gap:8px}.masteryEvidence span{font-size:.72rem;color:#6d798c}.masteryEvidence b{font-size:.8rem}.masteryMessage{margin:13px 0 0;color:#5d6a7e;font-size:.82rem;line-height:1.5}
.freeTestLaunch{margin-top:18px;background:#101c35;color:#fff;border-radius:16px;padding:20px;display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}.freeTestLaunch span{font-size:.66rem;letter-spacing:.1em;font-weight:900;color:#aab9d0}.freeTestLaunch h3{margin:5px 0}.freeTestLaunch p{margin:0;color:#bdc9da;font-size:.82rem}.freeTestArea{margin-top:18px}.testIntro{display:flex;justify-content:space-between;gap:20px;align-items:start;background:#fff;border:1px solid #e0e5ed;border-radius:14px;padding:18px}.testIntro h3{margin:5px 0}.testIntro p{margin:0;color:#617086;line-height:1.5}.testCount{min-width:88px;background:#eef4ff;border-radius:12px;padding:13px;text-align:center;font-size:1.7rem;font-weight:900;color:var(--blue)}.testCount span{display:block;font-size:.66rem;text-transform:uppercase;letter-spacing:.08em;color:#6e7e95}
.topicTestForm{display:grid;gap:14px;margin-top:14px}.testQuestion{background:#fff;border:1px solid #e0e5ed;border-radius:14px;padding:18px}.testQuestion h3{font-size:1rem;line-height:1.45}.testChoices{display:grid;gap:8px}.testChoices label{display:grid;grid-template-columns:auto 1fr;gap:9px;align-items:center;border:1px solid #d7dee9;border-radius:9px;padding:10px 11px;cursor:pointer}.testChoices label:hover{border-color:var(--blue);background:#f7f9ff}.testChoices input{margin:0}.testChoices span{font-size:.83rem}.testActions{display:flex;gap:10px;flex-wrap:wrap}.testWarning{margin-top:13px;padding:13px;background:#fff3e8;border:1px solid #f1d2b6;border-radius:10px;display:grid;gap:3px}.testWarning span{font-size:.8rem;color:#755b45}
.testResultsCard{margin-top:18px;background:#fff;border:1px solid #dce3ed;border-radius:16px;overflow:hidden;display:grid;grid-template-columns:190px 1fr}.testScore{background:#101c35;color:#fff;padding:22px;display:grid;align-content:start;gap:5px}.testScore span{font-size:.7rem;text-transform:uppercase;letter-spacing:.09em;color:#a9b7cb}.testScore strong{font-size:2.4rem}.testScore b{font-size:1.1rem;color:#bcd0ff}.resultSummary{padding:20px}.resultSummary h3{margin-top:0}.resultSummary p{color:#627085;line-height:1.5}.resultTopics{display:grid;gap:7px;margin-top:14px}.resultTopic{display:grid;grid-template-columns:1fr auto auto;gap:9px;align-items:center;border-top:1px solid #edf0f4;padding-top:8px;font-size:.78rem}.resultTopic em{font-style:normal;border-radius:999px;padding:4px 7px;font-size:.65rem;font-weight:850}.resultTopic em.strong{background:#e8f7f0;color:#087a55}.resultTopic em.developing{background:#fff5d9;color:#80640c}.resultTopic em.review{background:#fff0f0;color:#973c3c}.reviewRecommendations{margin-top:15px;background:#fff8e8;border-radius:10px;padding:12px}.reviewRecommendations b{font-size:.78rem}.reviewRecommendations ul{margin:8px 0 0;padding-left:18px;color:#655a39;font-size:.76rem;line-height:1.48}
@media(max-width:700px){.masteryEvidence{grid-template-columns:repeat(2,1fr)}.freeTestLaunch{grid-template-columns:1fr}.testResultsCard{grid-template-columns:1fr}.testIntro{display:grid}.testCount{width:max-content}.resultTopic{grid-template-columns:1fr auto}.resultTopic em{grid-column:1/-1;width:max-content}}

/* V3.7 reusable theory notes + Free/Pro exam bank */
.theoryNotes{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}.noteCard{border:1px solid #dfe5ee;border-radius:14px;padding:17px;background:#fff;position:relative;overflow:hidden}.noteCard:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:#c7d2e5}.note-definition:before{background:#1f57d6}.note-physical:before{background:#147c68}.note-confusion:before{background:#d28a31}.note-worked:before{background:#7858bd}.note-exam:before{background:#252d42}.noteType{font-size:.62rem;font-weight:900;letter-spacing:.09em;color:#77859a;margin-bottom:7px}.noteCard h3{font-size:1rem;margin:0 0 7px}.noteCard p,.noteCard li{font-size:.82rem;line-height:1.58;color:#59677c}.noteCard p{margin:0}.noteCard ul{margin:9px 0 0;padding-left:18px}.examPracticeHeader{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:start}.bankStats{display:flex;gap:8px}.bankStats>div{min-width:70px;border:1px solid #dce3ed;border-radius:11px;padding:10px;text-align:center;background:#fff}.bankStats b{display:block;font-size:1.2rem}.bankStats span{font-size:.65rem;text-transform:uppercase;color:#7a8799;font-weight:850;letter-spacing:.06em}.examStandardNote{border:1px solid #cfdaf0;background:#f1f5ff;border-radius:11px;padding:12px 14px;display:grid;gap:3px;margin:15px 0}.examStandardNote b{font-size:.8rem}.examStandardNote span{font-size:.76rem;color:#63738a}.examQuestionStack{display:grid;gap:13px}.examQCard{border:1px solid #dde4ee;background:#fff;border-radius:14px;padding:17px}.examQMeta{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin-bottom:10px}.examQMeta>span:not(.proPill):not(.freePill){font-size:.63rem;background:#f2f5f9;border-radius:999px;padding:5px 8px;color:#637086;font-weight:750}.freePill{background:#e9f7f1;color:#0a7958;border:1px solid #bfe6d8;border-radius:999px;padding:4px 8px;font-size:.63rem;font-weight:900;letter-spacing:.07em}.examQCard h3{font-size:1rem;line-height:1.5;margin:7px 0 13px}.examChoices{display:grid;gap:8px;margin-bottom:10px}.examChoices label{display:grid;grid-template-columns:auto 1fr;gap:9px;align-items:center;border:1px solid #d8e0eb;border-radius:9px;padding:10px 11px;cursor:pointer}.examChoices label:hover{border-color:#1f57d6;background:#f7f9ff}.examChoices input{margin:0}.examChoices span{font-size:.82rem}.btn.small{padding:8px 11px;font-size:.75rem}.natAnswer{display:flex;gap:8px;flex-wrap:wrap}.natAnswer input{min-width:220px;border:1px solid #ccd5e1;border-radius:8px;padding:9px 10px;font-size:.84rem}.examSolution{margin-top:11px;border-radius:9px;padding:11px 12px;font-size:.8rem;line-height:1.5}.examSolution.correct{background:#eaf8f2;color:#17664f}.examSolution.review{background:#fff3e8;color:#805a37}.examLocked{background:linear-gradient(135deg,#fbfbfc,#f4f5f8);border-style:dashed}.lockedExamBody{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}.lockedExamBody b{font-size:.9rem}.lockedExamBody p{margin:4px 0 0;color:#7b8594;font-size:.76rem}.lockIcon{font-size:1.35rem;opacity:.65}.proBankFooter{margin-top:15px;border-radius:14px;background:#111b32;color:#fff;padding:16px;display:flex;gap:12px;align-items:flex-start}.proBankFooter b{font-size:.86rem}.proBankFooter p{margin:4px 0 0;color:#bec9d9;font-size:.75rem}@media(max-width:760px){.theoryNotes{grid-template-columns:1fr}.examPracticeHeader{grid-template-columns:1fr}.bankStats{justify-content:flex-start}.natAnswer input{min-width:0;flex:1}.moduleIntroStrip{grid-template-columns:repeat(2,1fr)}}


/* V3.9 public-launch polish */
.launchPill{display:inline-flex;align-items:center;border:1px solid #dbe2ec;background:#f6f8fb;color:#59677b;border-radius:999px;padding:7px 10px;font-size:.66rem;font-weight:850;white-space:nowrap}
.aboutSection{border-top:1px solid #edf0f4}.aboutGrid{display:grid;grid-template-columns:1.25fr .75fr;gap:28px;align-items:start}.aboutCard{border:1px solid #dde4ed;background:#fff;border-radius:16px;padding:20px}.aboutCard b{font-size:1rem}.aboutCard p{font-size:.82rem;line-height:1.6;color:#5d6a7e}.independenceNote{border-top:1px solid #edf0f4;padding-top:12px;margin-top:12px!important;font-size:.72rem!important;color:#778296!important}
.footerFine{border-top:1px solid rgba(255,255,255,.12);margin-top:18px;padding-top:15px;font-size:.68rem;line-height:1.5;opacity:.78}.footerFine p{margin:4px 0}.footerFine details{margin-top:7px}.footerFine summary{cursor:pointer;font-weight:800}
.publicProPreview{margin-top:16px;border:1px solid #d7dce7;border-radius:16px;background:linear-gradient(145deg,#fbfbfd,#f2f4f8);padding:18px}.proPreviewTop{display:grid;grid-template-columns:auto 1fr;gap:13px;align-items:start}.proPreviewTop h3{margin:0 0 5px;font-size:1rem}.proPreviewTop p{margin:0;color:#68758a;font-size:.78rem;line-height:1.5}.proTopicCloud{display:flex;gap:7px;flex-wrap:wrap;margin:14px 0}.proTopicCloud span{background:#fff;border:1px solid #dfe4ec;border-radius:999px;padding:7px 9px;font-size:.69rem;font-weight:750;color:#58657a}.proPreviewBottom{border-top:1px solid #dde2ea;padding-top:11px;display:grid;gap:3px}.proPreviewBottom b{font-size:.76rem}.proPreviewBottom span{font-size:.7rem;color:#758196}
.ownerPreviewBanner{border:1px solid #d9c570;background:#fff9db;border-radius:12px;padding:10px 12px;margin:16px 0;display:flex;gap:10px;align-items:center}.ownerPreviewBanner b{font-size:.68rem;letter-spacing:.07em}.ownerPreviewBanner span{font-size:.72rem;color:#6e633e}
@media(max-width:800px){.launchPill{display:none}.aboutGrid{grid-template-columns:1fr}.proPreviewTop{grid-template-columns:1fr}.ownerPreviewBanner{align-items:flex-start;flex-direction:column}}

/* V3.9.1 final public Pro-preview refinement */
.proTopicCloud{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.proTopicCloud span{display:flex;align-items:center;min-height:38px;border-radius:10px;padding:8px 10px;line-height:1.35}
.proPreviewBottom b{font-size:.82rem}
@media(max-width:620px){.proTopicCloud{grid-template-columns:1fr}}