:root{color-scheme:dark;--bg:#0b1425;--surface:#111e33;--surface2:#14233a;--text:#edf2fb;--muted:#9eafc7;--line:#26364d;--blue:#8dcaff;--accent:#518af7;--coral:#ffa698;--lavender:#bcaaff;--shadow:0 25px 80px #03091455}html.light{color-scheme:light;--bg:#f7f9fc;--surface:#fff;--surface2:#edf2f9;--text:#182a44;--muted:#526580;--line:#d6dfec;--blue:#2462b9;--accent:#376ce1;--coral:#b94233;--lavender:#6b50b3;--shadow:0 20px 60px #29456714}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}h1,h2,h3,p{margin-top:0}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button,input,select{font:inherit}button{cursor:pointer}button,a,input,select{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:5px}button{color:inherit}img{max-width:100%}[hidden]{display:none!important}.shell{width:min(1256px,calc(100% - 96px));margin:auto}.header{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:20}.nav-shell{width:min(1376px,calc(100% - 64px));margin:auto;min-height:86px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:12px;font-size:13px;line-height:1.4;font-weight:650;letter-spacing:-.02em}.brand-second{display:block}.brand-mark{font:italic 35px Georgia,serif;color:var(--blue);position:relative;padding-right:12px}.brand-mark span{font:17px Inter;position:absolute;right:0;top:-3px}.header nav{display:flex;gap:26px;margin-left:auto}.header nav a{font-size:12px;color:var(--muted);padding:30px 0;position:relative;white-space:nowrap}.header nav a[aria-current=page]{color:var(--text)}.header nav a[aria-current=page]:after{content:'';height:2px;position:absolute;bottom:20px;left:0;right:0;background:var(--blue)}.icon-button,.menu-button{background:none;border:1px solid var(--line);border-radius:7px;padding:5px 11px}.icon-button{font-size:23px;line-height:1.2}.menu-button{display:none;font-size:12px}.skip{position:fixed;top:-100px;left:15px;z-index:99;background:var(--surface);padding:10px}.skip:focus{top:10px}.eyebrow{font-size:10px;letter-spacing:.15em;font-weight:650;line-height:1.7;color:var(--blue);text-transform:uppercase;margin-bottom:22px}.hero{background:radial-gradient(ellipse at 80% 25%,#5166a716,transparent 55%);border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start;padding-top:75px;padding-bottom:45px}.status-dot{display:inline-block;background:#8de0c1;border-radius:50%;width:6px;height:6px;margin-right:8px;vertical-align:middle}.hero h1{font-size:clamp(42px,4.4vw,62px);font-weight:600;letter-spacing:-.065em;line-height:1.09;margin-bottom:28px}.hero h1>span{color:var(--blue);background:linear-gradient(105deg,var(--blue),var(--lavender));background-clip:text;-webkit-text-fill-color:transparent}.hero-hook{font-size:26px;letter-spacing:-.03em;line-height:1.35;margin-bottom:20px}.hero-description{color:var(--muted);font-size:14px;line-height:1.9;max-width:480px;margin-bottom:27px}.actions{display:flex;align-items:center;gap:27px;flex-wrap:wrap}.button{display:inline-flex;gap:30px;align-items:center;justify-content:center;padding:13px 22px;border-radius:7px;font-size:12px;font-weight:600}.primary{background:linear-gradient(110deg,#366de4,#6856c8);color:#fff;box-shadow:0 6px 25px #3860d322;border:1px solid #8ca4ff33}.primary:hover{background:#416ed8;color:white}.text-link{font-size:12px;font-weight:550}.text-link span{margin-left:10px;color:var(--blue)}.hero-facts{display:flex;gap:25px;margin:28px 0 0;font-size:11px;color:var(--muted)}.hero-facts b{font-weight:600;color:var(--text);margin-right:3px}.hero-art{position:relative;height:210px;border-radius:9px;overflow:hidden;margin-top:28px;border:1px solid #33425b}.hero-art img{height:100%;width:100%;object-fit:cover;object-position:50% 60%;display:block}.hero-art:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#08142688,transparent 80%)}.hero-art>span{position:absolute;z-index:1;left:18px;top:16px;font-size:8px;font-weight:650;letter-spacing:.16em;color:#c5d5eb}.question-deck{border:1px solid #34455e;background:#0d192d;border-radius:14px;box-shadow:var(--shadow);overflow:hidden;color:#edf2fb;--blue:#8dcaff;--muted:#a6b4cc}.deck-header{display:flex;justify-content:space-between;padding:20px 26px;border-bottom:1px solid #2a3b53;font-size:9px;letter-spacing:.13em;color:#b2c3dc}.deck-header #slide-count{color:#8dcaff;white-space:nowrap}.slide-intro{padding:28px 28px 6px;min-height:155px}.slide-intro .eyebrow{margin-bottom:11px}.slide-intro h2{font-size:29px;line-height:1.25;font-weight:550;letter-spacing:-.04em;margin:0}.chart{display:block;width:100%;height:auto}.slide-caption{padding:4px 28px 24px;min-height:193px}.slide-caption>p{font-size:12px;line-height:1.8;color:#adbed7;margin-bottom:13px;min-height:44px}.chart-meta{font-size:8px;color:#9daec7;letter-spacing:.015em;border-top:1px solid #2a3b53;padding-top:12px;margin-bottom:14px}.slide-caption>a{font-size:11px;font-weight:600;display:flex;justify-content:space-between;color:#8dcaff}.carousel-controls{display:flex;justify-content:space-between;align-items:center;padding:15px 26px;border-top:1px solid #2a3b53}.dots{display:flex;gap:3px}.dot{width:24px;height:30px;background:none;border:0;position:relative}.dot:before{content:'';position:absolute;width:5px;height:5px;left:9px;top:12px;background:#62708c;border-radius:50%}.dot[aria-pressed=true]:before{width:16px;left:4px;border-radius:4px;background:#8dcaff}.transport{display:flex;gap:8px}.transport button{background:transparent;border:1px solid #31435e;border-radius:5px;width:32px;height:30px;line-height:1;font-size:13px;color:#c3d5ee}.hero-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:20px;padding-bottom:23px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}.hero-bottom>span{font-size:8px;letter-spacing:.14em}.section{padding-top:95px;padding-bottom:95px}.section-heading{margin-bottom:42px}.section-heading h2{font-size:40px;line-height:1.17;letter-spacing:-.05em;font-weight:550;margin-bottom:20px}.section-heading>p:last-child{color:var(--muted);font-size:13px}.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:42px}.pillars article{border-top:1px solid var(--line);padding-top:24px}.large-number{font-size:12px;color:var(--blue);display:block;margin-bottom:28px}.pillars h3{font-size:22px;line-height:1.3;letter-spacing:-.04em;font-weight:550}.pillars p{font-size:13px;color:var(--muted);margin-bottom:24px}.pillars a{font-size:11px;font-weight:600;color:var(--blue)}.pathways{border-block:1px solid var(--line);background:var(--surface)}.pathways>.shell{display:grid;grid-template-columns:.8fr 1.3fr;gap:70px}.path-list{border-top:1px solid var(--line)}.path{display:grid;grid-template-columns:30px 1fr 25px;gap:22px;padding:25px 0;border-bottom:1px solid var(--line)}.path-number{color:var(--blue);font-size:11px}.path .eyebrow{font-size:8px;margin-bottom:8px}.path h3{font-size:21px;font-weight:550;letter-spacing:-.04em;margin-bottom:10px}.path p:last-child{color:var(--muted);font-size:12px;margin-bottom:0}.path-arrow{color:var(--blue);font-size:22px}.filter-bar{display:flex;gap:20px;align-items:end;margin:0 0 30px}.filter-bar label{display:block;font-size:10px;color:var(--muted);font-weight:550}.filter-bar label:first-child{flex:1;max-width:470px}.filter-bar input,.filter-bar select{display:block;width:100%;padding:12px 15px;margin-top:7px;color:var(--text);background:var(--surface);border:1px solid var(--line);border-radius:6px;font-size:12px}.filter-bar select{min-width:235px}.filter-bar input::placeholder{color:var(--muted)}#result-count{margin:0 0 11px auto;font-size:10px;white-space:nowrap;color:var(--muted)}.directory{border-top:1px solid var(--line)}.directory-row{display:grid;grid-template-columns:100px 1fr auto;gap:20px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}.chapter-label{font-size:10px;color:var(--muted)}.chapter-title{font-size:13px;font-weight:500}.row-links{display:flex;gap:22px;font-size:10px;color:var(--blue)}.page-intro{padding-top:75px;padding-bottom:42px}.page-intro h1{font-size:clamp(38px,4.5vw,62px);line-height:1.1;letter-spacing:-.06em;font-weight:550;margin-bottom:25px}.lead{font-size:15px;line-height:1.9;color:var(--muted);max-width:680px}.catalog-section{padding-bottom:95px}.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.app-card{background:var(--surface);border:1px solid var(--line);border-radius:9px;overflow:hidden;display:flex;flex-direction:column}.card-image{display:block;height:180px;position:relative;background:#f2eee6;overflow:hidden}.card-image img{height:100%;width:100%;object-fit:contain;display:block}.card-image>span{position:absolute;left:10px;bottom:10px;background:#0b1425dd;padding:3px 7px;border-radius:3px;font-size:7px;letter-spacing:.13em;color:#d2e0f7}.card-body{padding:23px;display:flex;flex-direction:column;flex:1}.card-body .eyebrow{font-size:8px;margin-bottom:12px}.card-body h2{font-size:19px;line-height:1.35;letter-spacing:-.035em;font-weight:550;margin-bottom:15px}.card-body p{font-size:11px;color:var(--muted);line-height:1.8}.card-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:auto;padding-top:16px;font-size:10px;color:var(--blue)}.card-actions a:last-child{color:var(--muted)}.episode{padding:28px 0;border-top:1px solid var(--line)}.episode-summary{display:flex;gap:25px;align-items:flex-start}.episode-number{font-size:24px;color:var(--blue);font-weight:450;letter-spacing:-.04em;line-height:1.2;min-width:35px}.episode-summary .eyebrow{font-size:8px;margin-bottom:8px}.episode-summary h2{font-size:21px;line-height:1.3;letter-spacing:-.03em;font-weight:550;margin-bottom:8px}.episode-summary a{font-size:10px;color:var(--blue)}.episode .podcast-widget{margin-top:17px}.resource-note{font-size:12px;color:var(--muted);margin-top:30px}.tutor-section{padding-bottom:110px}.tutor-panel{display:grid;grid-template-columns:.8fr 1.2fr;gap:65px;align-items:center;padding:65px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.tutor-panel h2{font-size:33px;line-height:1.2;font-weight:550;letter-spacing:-.04em;margin:24px 0}.tutor-panel p{color:var(--muted);font-size:13px}.coming-badge{font-size:8px;letter-spacing:.14em;color:var(--blue);padding:7px 10px;border:1px solid var(--line);border-radius:20px}.tutor-art{aspect-ratio:1;position:relative;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle,#6184ed22,transparent 70%)}.tutor-art:before{content:'';position:absolute;inset:23px;border:1px dashed var(--line);border-radius:50%}.tutor-art>span{font:100px Georgia,serif;color:var(--blue)}.tutor-art i,.tutor-art b,.tutor-art em{position:absolute;font:italic 30px Georgia,serif;background:var(--surface);color:var(--lavender);padding:12px}.tutor-art i{left:0;top:30%}.tutor-art b{right:3%;top:10%}.tutor-art em{bottom:-15px;left:50%}footer{border-top:1px solid var(--line);padding:45px 0 25px;background:var(--surface)}.footer-inner{display:flex;justify-content:space-between;gap:30px}.footer-inner p{font-size:11px;color:var(--muted);margin:12px 0}.footer-meta{display:flex;flex-direction:column;align-items:flex-end;gap:7px;font-size:10px}.credit{border-top:1px solid var(--line);padding-top:20px;margin-top:25px;font-size:9px;color:var(--muted)}.empty{padding:30px 0;color:var(--muted)}
@media(min-width:1450px){.hero-grid{gap:90px}.hero h1{font-size:62px}}@media(max-width:1120px){.shell{width:calc(100% - 64px)}.nav-shell{width:calc(100% - 40px);gap:16px}.header nav{gap:17px}.header nav a{font-size:11px}.hero-grid{gap:35px}.hero h1{font-size:44px}.hero-facts{gap:18px}.slide-intro h2{font-size:26px}.slide-caption{min-height:205px}.app-grid{grid-template-columns:repeat(2,1fr)}.pathways>.shell{gap:40px}.brand{font-size:11px}}
@media(max-width:850px){.header nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);padding:15px 25px;flex-direction:column;gap:0}.header nav.is-open{display:flex}.header nav a{padding:12px 0;font-size:13px}.header nav a[aria-current=page]:after{bottom:8px;width:20px}.icon-button{margin-left:auto}.menu-button{display:block}.nav-shell{min-height:72px}.hero-grid{grid-template-columns:1fr;gap:35px;padding-top:42px}.hero-copy{display:grid;grid-template-columns:1fr 1fr;column-gap:28px}.hero-copy>*{grid-column:1/-1}.hero-art{grid-column:2;grid-row:4/8;margin:0;height:100%}.hero-description,.hero-copy .actions,.hero-facts{grid-column:1}.hero h1{font-size:60px}.hero-hook{font-size:25px}.hero-facts{flex-wrap:wrap;gap:12px}.question-deck{max-width:620px;width:100%;margin:auto}.slide-intro{min-height:auto}.slide-intro h2{font-size:31px}.slide-caption{min-height:auto}.slide-caption>p{min-height:0}.section{padding-top:65px;padding-bottom:65px}.pillars{gap:23px}.pillars h3{font-size:20px}.pathways>.shell{grid-template-columns:1fr;gap:0}.section-heading h2{font-size:34px}.tutor-panel{padding:35px;gap:35px}.tutor-panel h2{font-size:27px}.filter-bar{flex-wrap:wrap}#result-count{flex-basis:100%;margin:0}.filter-bar label:first-child{max-width:none}.directory-row{grid-template-columns:80px 1fr;gap:10px}.row-links{grid-column:2}.footer-inner{gap:20px}}
@media(max-width:560px){.shell{width:calc(100% - 36px)}.nav-shell{width:calc(100% - 30px);gap:11px}.hero-copy{display:block}.hero h1{font-size:clamp(28px,8.6vw,44px)}.hero-art{height:185px;margin-top:25px}.hero-facts{margin-top:24px}.hero-description{font-size:13px}.hero-hook{font-size:24px}.hero-grid{gap:30px;padding-bottom:30px}.slide-intro{padding:24px 20px 5px}.slide-intro h2{font-size:26px}.deck-header{padding:17px 20px;font-size:8px}.slide-caption{padding:3px 20px 20px}.slide-caption>p{font-size:12px}.chart-meta{font-size:8px}.carousel-controls{padding:12px 18px}.hero-bottom{gap:20px}.hero-bottom>span{font-size:7px;max-width:120px}.hero-bottom>a{font-size:9px}.pillars{grid-template-columns:1fr;gap:30px}.large-number{margin-bottom:15px}.pillars article{padding-top:18px}.pillars p{margin-bottom:15px}.section-heading h2{font-size:32px}.path{gap:12px;grid-template-columns:22px 1fr 20px}.path h3{font-size:20px}.filter-bar{gap:13px}.filter-bar label{width:100%}.filter-bar label:first-child{flex-basis:100%}.filter-bar input,.filter-bar select{font-size:14px;min-width:0}.directory-row{grid-template-columns:65px 1fr;gap:10px}.chapter-label{font-size:9px}.chapter-title{font-size:12px}.app-grid{grid-template-columns:1fr}.card-image{height:195px}.card-body h2{font-size:22px}.page-intro{padding-top:45px;padding-bottom:25px}.page-intro h1{font-size:42px}.lead{font-size:13px}.episode-summary{gap:14px}.episode-summary h2{font-size:19px}.episode-number{font-size:22px;min-width:26px}.tutor-panel{grid-template-columns:1fr;padding:26px}.tutor-art{width:170px;margin:auto}.tutor-art>span{font-size:75px}.tutor-art i,.tutor-art b,.tutor-art em{font-size:20px}.footer-inner{flex-direction:column}.footer-meta{align-items:flex-start}.actions{gap:18px}.button{padding:12px 18px}.row-links{gap:20px}.catalog-section{padding-bottom:60px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}
/* Keep every carousel action reachable on narrow phones. */
@media(max-width:560px){.carousel-controls{flex-direction:column;gap:8px}.transport button{width:40px;height:36px}.slide-intro{min-height:170px}.slide-caption{min-height:205px}}
/* Topic illustrations sit behind the question and fade beneath the evidence. */
.question-slide{position:relative;isolation:isolate;overflow:hidden}
.question-slide .scene-art{position:absolute;inset:0 0 auto;width:100%;height:360px;object-fit:cover;object-position:center 45%;z-index:-2;pointer-events:none}
.question-slide::before{content:'';position:absolute;inset:0 0 auto;height:362px;z-index:-1;pointer-events:none;background:linear-gradient(180deg,rgba(13,25,45,.06) 0%,rgba(13,25,45,.12) 28%,rgba(13,25,45,.75) 58%,#0d192d 96%),linear-gradient(90deg,rgba(13,25,45,.86),rgba(13,25,45,.48) 43%,rgba(13,25,45,.08) 80%)}
.question-slide .slide-intro h2{color:#f5f8ff;text-shadow:0 2px 14px #061020}
.question-slide .slide-intro .eyebrow{color:#9ed7ff;text-shadow:0 1px 8px #061020}
.question-slide .chart{position:relative}
@media(max-width:560px){.question-slide .scene-art{height:305px;object-position:65% center}.question-slide::before{height:307px;background:linear-gradient(180deg,rgba(13,25,45,.06),rgba(13,25,45,.22) 32%,rgba(13,25,45,.87) 66%,#0d192d 97%),linear-gradient(90deg,rgba(13,25,45,.8),rgba(13,25,45,.35) 55%,rgba(13,25,45,.08))}}

/* Shared family with Mastering Causal Metrics. */
:root{--bg:#0f172a;--surface:#131e33;--surface2:#1e293b;--text:#e2e8f0;--muted:#a5b3cb;--line:rgba(157,179,219,.17);--blue:#38bdf8;--lavender:#a78bfa;--green:#34d399;--shadow:0 24px 80px rgba(0,0,0,.18)}
html.light{--bg:#f8fafc;--surface:#fff;--surface2:#edf2f9;--text:#1e293b;--muted:#53627a;--line:rgba(51,65,85,.17);--blue:#2563eb;--lavender:#7c3aed;--green:#059669}
.header{background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(12px)}.nav-shell{width:min(1380px,calc(100% - 64px));min-height:76px;gap:25px}.brand{font-size:13px;font-weight:700}.brand-mark{font:27px/34px Georgia,serif;border:1px solid var(--line);border-radius:10px;width:38px;height:38px;flex-shrink:0;text-align:center;padding-right:4px}.brand-mark span{font-size:12px;right:3px;top:-3px;color:var(--lavender)}.header nav{gap:25px}.header nav a{font-size:12px;font-weight:500;padding:24px 0}.header nav a[aria-current=page]:after{display:none}.icon-button,.menu-button{min-width:44px;min-height:44px;border-radius:9px}.button{padding:14px 20px;border-radius:8px}.primary{background:linear-gradient(115deg,#2563eb,#6741cf)}.page-intro{padding-top:70px}.page-intro h1{font-weight:600}.app-card{border-radius:16px}.card-body{padding:26px}.card-image{height:auto;aspect-ratio:3/2}.card-actions a{padding-block:10px}.footer-inner .brand{font-size:14px}
@media(max-width:1050px){.nav-shell{gap:16px;width:calc(100% - 40px)}.header nav{gap:16px}.header nav a{font-size:11px}}
@media(max-width:850px){.nav-shell{min-height:72px}.header nav a{font-size:13px;padding:12px 0}}
@media(max-width:560px){.nav-shell{gap:10px}.brand{font-size:10px}.brand-mark{width:32px;height:34px;font-size:25px;line-height:30px}.app-card{border-radius:12px}}