:root{--ink:#101b3f;--ink-muted:#5f6880;--blue:#1055a0;--purple:#64219a;--paper:#f7f9fc;--surface:#fff;--surface-soft:#f2f5fa;--tint-blue:#eaf3ff;--tint-purple:#f3eafb;--border:#dce3ee;--border-strong:#bdc9da;--white:#fff;--brand-gold:#9a5b13;--font-body:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--shadow:0 16px 42px #101b3f1a}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);font-family:var(--font-body);margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}img{max-width:100%}.container{width:min(1180px,100% - 2rem);margin-inline:auto}.learn-app-shell{flex-direction:column;min-height:100vh;display:flex}.learn-main{flex:1;padding:clamp(3rem,7vw,6rem) 0}.eyebrow{color:var(--purple);letter-spacing:.14em;margin:0 0 .65rem;font-size:.75rem;font-weight:850}.page-lead{max-width:650px;color:var(--ink-muted);font-size:1.05rem}.btn{cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:.5rem;min-height:44px;padding:.7rem 1.1rem;font-weight:760;transition:transform .18s,box-shadow .18s,background .18s;display:inline-flex}.btn:hover{transform:translateY(-1px)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-primary{color:#fff;background:linear-gradient(135deg, var(--blue), var(--purple));box-shadow:0 8px 20px #1055a033}.btn-secondary{color:var(--ink);border-color:var(--border);background:#fff}.btn-sm{min-height:36px;padding:.45rem .8rem;font-size:.82rem}.btn-wide{width:100%}.form-error{color:#a51d31;font-size:.88rem}.site-header{z-index:80;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#f7f9fceb;border-bottom:1px solid #0000;position:sticky;top:0}.site-header.scrolled{border-color:var(--border);box-shadow:0 8px 24px #101b3f0f}.site-header>.container{align-items:center;gap:2rem;min-height:76px;display:flex}.branding{align-items:center;gap:.7rem;display:flex}.logo{color:#fff;background:linear-gradient(145deg, var(--blue), var(--purple));border-radius:50%;place-items:center;width:38px;height:38px;font-weight:900;display:grid}.brand-copy{display:grid}.brand-name{font-weight:850}.learn-badge{color:var(--purple)}.tagline{color:var(--ink-muted);font-size:.66rem}.site-nav{color:var(--ink-muted);align-items:center;gap:1.5rem;margin-left:auto;font-size:.9rem;font-weight:680;display:flex}.site-nav a:hover{color:var(--blue)}.header-actions{align-items:center;display:flex}.profile-menu{position:relative}.profile-trigger{cursor:pointer;background:0 0;border:0;align-items:center;gap:.3rem;padding:.2rem;display:flex}.profile-avatar{color:#fff;background:var(--blue);border-radius:50%;place-items:center;width:38px;height:38px;font-size:.75rem;font-weight:850;display:grid;overflow:hidden}.profile-avatar img{object-fit:cover;width:100%;height:100%}.profile-chevron{color:var(--ink-muted)}.profile-dropdown{border:1px solid var(--border);width:205px;box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:.6rem;display:none;position:absolute;top:calc(100% + .7rem);right:0}.profile-menu.open .profile-dropdown{display:grid}.profile-dropdown p{text-overflow:ellipsis;margin:.35rem .55rem .55rem;font-size:.85rem;font-weight:760;overflow:hidden}.profile-dropdown a,.profile-dropdown button{color:var(--ink);text-align:left;cursor:pointer;background:0 0;border:0;border-radius:7px;padding:.65rem .55rem}.profile-dropdown a:hover,.profile-dropdown button:hover{background:var(--surface-soft)}.profile-dropdown-divider{background:var(--border);height:1px;margin:.25rem 0}.nav-toggle{background:0 0;border:0;margin-left:.5rem;padding:.4rem;display:none}.nav-toggle span{background:var(--ink);width:21px;height:2px;margin:4px;display:block}.site-footer{color:#dce6fa;background:#0d1736;margin-top:auto;padding:2.5rem 0}.learn-footer-grid{justify-content:space-between;gap:2rem;display:flex}.learn-footer-brand p{color:#aab7d1;margin:.5rem 0 0;font-size:.85rem}.learn-footer-logo{font-size:1.05rem}.learn-footer-links{color:#c6d3ea;flex-wrap:wrap;align-content:start;gap:1rem 1.5rem;font-size:.82rem;display:flex}.public-learn-header .container{align-items:center;gap:2rem;min-height:76px;display:flex}.public-learn-nav{color:var(--ink-muted);align-items:center;gap:1.25rem;margin-left:auto;font-size:.9rem;font-weight:700;display:flex}.public-learn-nav a:hover{color:var(--blue)}.catalogue-page,.public-course-page{padding-top:0}.catalogue-hero{padding-top:clamp(3rem,8vw,6.5rem);padding-bottom:clamp(3rem,7vw,5rem)}.catalogue-hero h1{letter-spacing:-.055em;max-width:920px;margin:.6rem 0 1rem;font-size:clamp(2.4rem,7vw,5rem);line-height:1.02}.catalogue-actions{flex-wrap:wrap;align-items:center;gap:.75rem;margin-top:1.5rem;display:flex}.catalogue-price{color:var(--ink);margin:1.1rem 0 0;font-weight:850}.catalogue-course-list{padding:0 0 4rem}.catalogue-course-card{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:24px;padding:clamp(1.5rem,5vw,3rem)}.catalogue-course-card h2{margin:.25rem 0 .8rem;font-size:clamp(1.6rem,4vw,2.6rem)}.course-policy-links{color:var(--ink-muted);font-size:.82rem}.course-policy-links a,.policy-content a{color:var(--blue);text-underline-offset:3px;text-decoration:underline}.course-catalogue{padding-bottom:5rem}.course-catalogue>h2{font-size:clamp(1.8rem,4vw,2.8rem)}.course-catalogue>p{max-width:760px;color:var(--ink-muted);line-height:1.65}.course-module-list{counter-reset:module;gap:1rem;margin:2rem 0 0;padding:0;list-style:none;display:grid}.course-module-list>li{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:clamp(1.2rem,4vw,2rem)}.course-module-list h3{margin:0 0 .5rem}.course-module-list>li>p{color:var(--ink-muted);line-height:1.55}.course-module-list ul{gap:.6rem;margin:1rem 0 0;padding:0;list-style:none;display:grid}.course-module-list ul li{border-top:1px solid var(--border);justify-content:space-between;gap:1rem;padding-top:.6rem;display:flex}.course-module-list ul a{color:var(--blue);font-weight:700}.course-module-list ul span{color:var(--ink-muted);flex:none;font-size:.75rem}.public-resource-shell{padding:clamp(2.5rem,7vw,5rem) 0}.public-resource-shell .lesson-viewer,.public-resource-shell .paid-lesson-stub,.public-resource-shell .quiz-shell{margin-inline:auto}.public-track-cta{background:var(--tint-blue);border:1px solid #c8ddf6;border-radius:16px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;max-width:780px;margin:2rem auto 0;padding:1.25rem;display:flex}.public-track-cta p{color:var(--ink-muted);margin:0}.policy-content{max-width:800px}.policy-content h1{letter-spacing:-.045em;font-size:clamp(2.2rem,6vw,4rem)}.policy-content h2{margin-top:2rem}.policy-content p,.policy-content li{color:var(--ink-muted);line-height:1.75}.auth-page{background:radial-gradient(circle at 15% 15%, #e5f0ff, transparent 42%), radial-gradient(circle at 85% 85%, #f0e4fb, transparent 42%), var(--paper);place-items:center;min-height:100vh;padding:2rem;display:grid}.auth-card{text-align:center;border:1px solid var(--border);width:min(460px,100%);box-shadow:var(--shadow);background:#fffffff5;border-radius:24px;padding:clamp(2rem,6vw,3rem)}.auth-card h1{letter-spacing:-.035em;margin:.8rem 0;font-size:clamp(2rem,6vw,2.8rem)}.auth-card>p:not(.eyebrow):not(.form-error){color:var(--ink-muted);line-height:1.6}.learn-wordmark{margin-bottom:2rem;font-size:1.1rem;display:inline-block}.google-mark{color:#4285f4;background:#fff;border-radius:50%;place-items:center;width:24px;height:24px;font-weight:900;display:grid}.auth-legal{margin:1.4rem 0 0;font-size:.75rem!important}.auth-legal a{color:var(--blue);text-decoration:underline}.dashboard-page h1{letter-spacing:-.045em;margin:0;font-size:clamp(2.2rem,5vw,4rem)}.dashboard-course-card{border:1px solid var(--border);box-shadow:var(--shadow);background:#fff;border-radius:22px;grid-template-columns:minmax(0,1fr) auto;gap:2rem;margin-top:2.5rem;padding:clamp(1.4rem,4vw,2.5rem);display:grid}.dashboard-course-card h2{margin:.8rem 0;font-size:clamp(1.4rem,3vw,2rem)}.dashboard-course-card p{max-width:680px;color:var(--ink-muted);line-height:1.65}.course-facts{color:var(--ink-muted);flex-wrap:wrap;gap:.6rem 1.4rem;padding:0;font-size:.85rem;list-style:none;display:flex}.access-pill{border-radius:999px;padding:.35rem .65rem;font-size:.72rem;font-weight:800;display:inline-flex}.access-pill.active{color:#08623b;background:#dcfce7}.access-pill.locked{color:#8a5615;background:#fff0cd}.dashboard-course-progress{border-left:1px solid var(--border);align-content:center;gap:.8rem;min-width:190px;padding-left:2rem;display:grid}.dashboard-course-progress strong{font-size:2rem}.dashboard-course-progress span{color:var(--ink-muted);font-size:.8rem}.dashboard-details-link{color:var(--blue);text-align:center;font-size:.8rem;text-decoration:underline}.paywall-page{place-items:center;padding-inline:1rem;display:grid}.paywall-card{text-align:center;border:1px solid var(--border);width:min(680px,100%);box-shadow:var(--shadow);background:#fff;border-radius:24px;padding:clamp(2rem,6vw,4rem)}.paywall-card h1{font-size:clamp(1.7rem,4vw,2.8rem)}.paywall-card>p:not(.eyebrow){color:var(--ink-muted);line-height:1.7}.paywall-card .checkout-terms-note{max-width:520px;margin:1rem auto;font-size:.86rem}.lock-icon{font-size:2rem}.paywall-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:.8rem;margin-top:1.8rem;display:flex}.paywall-actions>a:not(.btn){color:var(--blue);font-size:.85rem;text-decoration:underline}.checkout-panel{gap:.75rem;margin-top:1.4rem;display:grid}.dashboard-course-progress .checkout-panel{margin-top:0}.checkout-price{color:var(--ink-muted);margin:0;font-size:.82rem}.checkout-status{border:1px solid var(--border);border-radius:12px;gap:.35rem;padding:.85rem;font-size:.82rem;line-height:1.45;display:grid}.checkout-status a{color:var(--blue);font-weight:750;text-decoration:underline}.checkout-status--success{color:#08623b;background:#ecfdf3;border-color:#b7e4ca}.checkout-status--failure{color:#8f1830;background:#fff1f2;border-color:#fecdd3}.checkout-status--pending{color:#7a4b0d;background:#fff8e7;border-color:#f4d68b}.course-player-layout{grid-template-columns:315px minmax(0,1fr);min-height:calc(100vh - 76px);display:grid}.course-sidebar{color:#dce6fa;background:#101b3f;border-right:1px solid #26345c;height:calc(100vh - 76px);position:sticky;top:76px;overflow:auto}.course-sidebar-summary{border-bottom:1px solid #29365b;padding:1.25rem}.course-sidebar-summary-top{color:#9fb1d2;text-transform:uppercase;letter-spacing:.07em;justify-content:space-between;gap:1rem;font-size:.68rem;display:flex}.course-sidebar-summary-progress{color:#bdcbdf}.course-sidebar-summary-title{color:#fff;margin:.7rem 0 .25rem;font-weight:760}.course-sidebar-summary-text{color:#9fb1d2;margin:0;font-size:.78rem}.course-sidebar-nav{padding-bottom:2rem}.sidebar-module{border-bottom:1px solid #29365b}.sidebar-module-title{color:#fff;margin:0;padding:1.1rem 1.2rem .6rem;font-size:.78rem}.sidebar-module ul{margin:0;padding:0 0 .6rem;list-style:none}.sidebar-lesson{color:#b7c5dd;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:.4rem;padding:.62rem 1rem .62rem 1.2rem;font-size:.76rem;display:grid}.sidebar-lesson:hover,.sidebar-lesson.active{color:#fff;background:#1d2d58}.sidebar-lesson.completed,.sidebar-lesson.quiz-passed{color:#8dd8b1}.sidebar-lesson.locked{opacity:.7}.sidebar-lesson-status{text-align:center}.sidebar-lesson-name{line-height:1.35}.sidebar-lesson-time{color:#8294b6;font-size:.67rem}.sidebar-toggle{display:none}.course-player-main{background:var(--paper);min-width:0;padding:clamp(1.5rem,5vw,4rem)}.course-player-main>*{margin-inline:auto}.lesson-progress-bar{max-width:780px;color:var(--ink-muted);margin-bottom:2rem;font-size:.75rem}.lesson-progress-track{background:var(--border);border-radius:999px;height:5px;margin-top:.55rem;overflow:hidden}.lesson-progress-fill{background:linear-gradient(90deg, var(--blue), var(--purple));height:100%}.lesson-actions{border-top:1px solid var(--border);max-width:780px;margin-top:2rem;padding-top:1.5rem}.lesson-complete-badge{color:#087347;font-weight:800}.lesson-nav{justify-content:space-between;gap:1rem;max-width:780px;margin-top:2rem;display:flex}.quiz-result{text-align:center;border:1px solid var(--border);max-width:620px;box-shadow:var(--shadow);background:#fff;border-radius:20px;padding:3rem;margin-top:4rem!important}.quiz-result h1{margin:.5rem;font-size:4rem}@media (max-width:820px){.site-header>.container{min-height:68px}.site-nav{border:1px solid var(--border);box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:1rem;display:none;position:absolute;top:68px;left:1rem;right:1rem}.site-nav.mobile{display:grid}.nav-toggle{display:block}.tagline{display:none}.learn-footer-grid{flex-direction:column}.public-learn-header .container{gap:1rem;min-height:68px}.public-learn-nav{gap:.65rem;font-size:.78rem}.dashboard-course-card{grid-template-columns:1fr}.dashboard-course-progress{border-top:1px solid var(--border);border-left:0;padding:1.4rem 0 0}.course-player-layout{min-height:0;display:block}.sidebar-toggle{z-index:60;color:#fff;text-align:left;background:#101b3f;border:0;justify-content:space-between;align-items:center;width:100%;min-height:58px;padding:.7rem 1rem;display:flex;position:sticky;top:68px}.sidebar-toggle-copy{min-width:0;display:grid}.sidebar-toggle-eyebrow{color:#9fb1d2;text-transform:uppercase;font-size:.63rem}.sidebar-toggle-title{text-overflow:ellipsis;white-space:nowrap;font-size:.8rem;font-weight:720;overflow:hidden}.sidebar-toggle-meta{color:#bdcbdf;align-items:center;gap:.65rem;font-size:.72rem;display:flex}.sidebar-toggle-icon{font-size:1.2rem}.course-sidebar{z-index:55;height:auto;display:none;position:fixed;inset:126px 0 0}.course-sidebar.open{display:block}.course-player-main{padding:1.4rem 1rem 3rem}}@media (max-width:520px){.brand-copy .brand-name{font-size:.88rem}.profile-chevron{display:none}.lesson-nav .btn{padding-inline:.8rem;font-size:.76rem}.public-learn-nav a:not(.btn){display:none}.course-module-list ul li{display:grid}}.learn-page-hero{background:linear-gradient(145deg, var(--tint-blue), var(--paper));border-bottom:1px solid var(--border);padding:clamp(3rem,7vw,5.5rem) 0 clamp(2.5rem,6vw,4rem)}.learn-page-hero__inner{max-width:850px}.learn-page-hero h1,.learn-page-title{margin-bottom:.7rem;font-size:clamp(2rem,5vw,3.6rem)}.learn-page-hero p:not(.eyebrow){color:var(--ink-muted)}.learn-breadcrumb{color:var(--ink-muted);flex-wrap:wrap;gap:.4rem;margin-bottom:1.4rem;font-size:.8rem;display:flex}.learn-breadcrumb a{color:var(--blue);font-weight:700}.learn-access-badge{border-radius:999px;margin-top:.8rem;padding:.35rem .7rem;font-size:.75rem;font-weight:800;display:inline-flex}.learn-access-badge.is-free{color:#09673c;background:#dcfce7}.learn-access-badge.is-preview{color:var(--purple);background:var(--tint-purple)}.learn-resource-section{--border-strong:color-mix(in srgb, var(--blue) 28%, var(--border));--brand-navy:var(--blue);--brand-gold:#9a5b13;--bg-soft:var(--surface-soft)}.learn-resource-shell{align-items:start;gap:clamp(1.5rem,4vw,3rem);display:grid}.learn-resource-main{min-width:0}.learn-resource-aside{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:16px;padding:1.25rem}.learn-resource-aside h2{margin-bottom:.5rem;font-size:1.25rem}.learn-resource-aside>p:not(.eyebrow){color:var(--ink-muted);font-size:.86rem}.learn-resource-aside ol{gap:.3rem;margin:1rem 0 0;padding:0;list-style:none;display:grid}.learn-resource-aside li{border-radius:8px;padding:.65rem .7rem;font-size:.82rem}.learn-resource-aside li.current{background:var(--tint-blue)}.learn-resource-aside a{color:var(--ink);font-weight:700;display:block}.learn-resource-aside li.current a{color:var(--blue)}.learn-resource-aside li span{color:var(--ink-muted);text-transform:uppercase;font-size:.68rem;font-weight:800}.lesson-viewer,.paid-lesson-stub,.learn-quiz-shell{max-width:780px}.lesson-title{margin-bottom:1.5rem;font-size:clamp(2rem,4vw,3rem)}.lesson-content{color:var(--ink)}.lesson-content h1,.lesson-content h2,.lesson-content h3{margin-top:2.2rem;margin-bottom:.8rem}.lesson-content h2{font-size:clamp(1.45rem,3vw,2rem)}.lesson-content h3{font-size:1.2rem}.lesson-content p,.lesson-content li{line-height:1.75}.lesson-content code{background:var(--tint-blue);border-radius:4px;padding:.1rem .3rem}.lesson-content pre{color:var(--white);background:#101e31;border-radius:10px;padding:1rem;overflow-x:auto}.lesson-content pre code{background:0 0;padding:0}.lesson-content blockquote{color:var(--ink-muted);background:var(--tint-purple);border-left:4px solid var(--purple);margin:1.5rem 0;padding:.9rem 1.2rem}.lesson-content hr{border:0;border-top:1px solid var(--border);margin:2rem 0}.lesson-table-wrap{border:1px solid var(--border);border-radius:10px;margin:1.5rem 0;overflow-x:auto}.lesson-content table{border-collapse:collapse;width:100%;font-size:.88rem}.lesson-content th,.lesson-content td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:.7rem .8rem}.lesson-content th{color:var(--blue);background:var(--tint-blue)}.paid-lesson-stub>p,.learn-quiz-note{color:var(--ink-muted)}.learn-objectives{gap:.6rem;margin:0 0 2.2rem;padding:0;list-style:none;display:grid}.learn-objectives li{padding-left:1.6rem;position:relative}.learn-objectives li:before{content:"✓";color:var(--blue);font-weight:800;position:absolute;left:0}.learn-availability-panel,.quiz-public-result{background:var(--tint-blue);border:1px solid var(--border);border-radius:16px;margin-top:2rem;padding:clamp(1.2rem,3vw,1.8rem)}.learn-availability-panel h2,.quiz-public-result h2{margin-bottom:.6rem;font-size:1.5rem}.learn-resource-nav{border-top:1px solid var(--border);flex-wrap:wrap;gap:.7rem;margin-top:2.5rem;padding-top:1.2rem;display:flex}.interactive-block{border-radius:12px;margin:2rem 0;overflow:hidden}.interactive-error{color:var(--ink-muted);background:var(--surface-soft);border:1px dashed var(--border);text-align:center;padding:1.5rem}.interactive-flashcards,.interactive-knowledge-check,.interactive-timeline,.interactive-drag-match{background:var(--surface-soft);border:1px solid var(--border-strong);padding:1.5rem}.flashcard-header,.dm-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.flashcard-label,.kc-label,.dm-label,.timeline-label{color:var(--brand-navy);font-size:.9rem;font-weight:700}.flashcard-counter{color:var(--ink-muted);font-size:.85rem}.flashcard{perspective:1000px;cursor:pointer;min-height:220px;margin-bottom:1rem}.flashcard-inner{width:100%;min-height:220px;transform-style:preserve-3d;transition:transform .5s;position:relative}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{min-height:220px;color:var(--ink);background:linear-gradient(135deg, var(--tint-blue), var(--surface));border:1px solid var(--border-strong);text-align:center;backface-visibility:hidden;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;padding:2rem;display:flex;position:absolute;inset:0}.flashcard-back{background:linear-gradient(135deg, var(--tint-purple), var(--surface));transform:rotateY(180deg)}.flashcard-side-label{color:var(--ink-muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:.5rem;font-size:.7rem}.flashcard-front p,.flashcard-back p{color:var(--ink);margin:0;font-size:1.2rem;font-weight:600;line-height:1.5}.flashcard-hint{color:var(--ink-muted);opacity:.7;margin-top:1rem;font-size:.72rem}.flashcard-nav{justify-content:center;align-items:center;gap:1rem;display:flex}.flashcard-shuffle{color:var(--ink);border:1px solid var(--border-strong);cursor:pointer;background:0 0;border-radius:8px;padding:.4rem .6rem}.flashcard-shuffle:hover{background:var(--tint-blue)}.interactive-knowledge-check{border-left:4px solid var(--brand-navy)}.kc-header{margin-bottom:.75rem}.kc-question{color:var(--ink);margin-bottom:1rem;font-size:1.05rem;font-weight:600;line-height:1.5}.kc-options{flex-direction:column;gap:.5rem;margin-bottom:1rem;display:flex}.kc-option{color:var(--ink);background:var(--surface);border:1px solid var(--border-strong);text-align:left;cursor:pointer;border-radius:8px;align-items:center;gap:.75rem;padding:.75rem 1rem;font-size:.92rem;transition:all .15s;display:flex}.kc-option:hover,.kc-option.selected{background:var(--tint-blue);border-color:var(--brand-navy)}.kc-option.correct{background:color-mix(in srgb, #22c55e 12%, var(--surface));border-color:#16a34a}.kc-option.incorrect{background:color-mix(in srgb, #ef4444 10%, var(--surface));border-color:#dc2626}.kc-option-letter{width:28px;height:28px;color:var(--brand-navy);background:var(--tint-blue);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:.8rem;font-weight:700;display:inline-flex}.kc-result{flex-direction:column;gap:.5rem;display:flex}.kc-result-badge{font-weight:700}.kc-result-badge.correct,.dm-result-text.correct{color:#15803d}.kc-result-badge.incorrect,.dm-result-text.incorrect{color:#b91c1c}.kc-explanation{color:var(--ink);background:var(--surface);border-radius:8px;margin:0;padding:.75rem 1rem;font-size:.88rem;line-height:1.5}.timeline-header{margin-bottom:1.25rem}.timeline-track{padding-left:2rem;position:relative}.timeline-track:before{content:"";background:linear-gradient(var(--brand-navy), var(--border));width:2px;position:absolute;top:8px;bottom:8px;left:8px}.timeline-node{cursor:pointer;padding:.5rem 0 1rem;position:relative}.timeline-dot{z-index:1;background:var(--surface);border:3px solid var(--brand-navy);border-radius:50%;width:14px;height:14px;position:absolute;top:.65rem;left:-2rem}.timeline-node.expanded .timeline-dot{background:var(--brand-navy)}.timeline-content{flex-direction:column;gap:.15rem;display:flex}.timeline-year{color:var(--brand-navy);font-size:.85rem;font-weight:800}.timeline-title{color:var(--ink);font-weight:600}.timeline-desc{color:var(--ink-muted);margin:.3rem 0 0;font-size:.85rem}.dm-grid{grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem;display:grid}.dm-concepts,.dm-definitions{flex-direction:column;gap:.5rem;display:flex}.dm-concept,.dm-def{min-height:58px;color:var(--ink);background:var(--surface);border:1px solid var(--border-strong);border-radius:8px;padding:.75rem 1rem;font-size:.88rem}.dm-concept{border-style:dashed;border-width:2px;flex-direction:column;justify-content:center;gap:.3rem;display:flex}.dm-concept.droppable,.dm-def:hover:not(.used),.dm-def.selected{background:var(--tint-blue);border-color:var(--brand-navy);cursor:pointer}.dm-concept.correct{background:color-mix(in srgb, #22c55e 8%, var(--surface));border-color:#16a34a}.dm-concept.incorrect{background:color-mix(in srgb, #ef4444 8%, var(--surface));border-color:#dc2626}.dm-concept-text,.dm-result-text{font-weight:700}.dm-matched-def,.dm-drop-hint{color:var(--ink-muted);font-size:.8rem}.dm-def{cursor:grab;min-height:auto}.dm-def.used{opacity:.4;border-style:dashed}.dm-result{margin-top:.5rem}.interactive-deep-dive{background:var(--surface-soft);border:1px solid var(--border-strong)}.deep-dive-header{width:100%;color:var(--ink);text-align:left;cursor:pointer;background:0 0;border:0;align-items:center;gap:.75rem;padding:1rem 1.25rem;font-weight:700;display:flex}.deep-dive-header:hover{background:var(--tint-blue)}.deep-dive-title{flex:1}.deep-dive-chevron{color:var(--ink-muted);font-size:.7rem}.deep-dive-body{grid-template-rows:0fr;transition:grid-template-rows .3s;display:grid}.interactive-deep-dive.expanded .deep-dive-body{grid-template-rows:1fr}.deep-dive-inner{padding:0 1.25rem;overflow:hidden}.interactive-deep-dive.expanded .deep-dive-inner{padding-bottom:1.25rem}.deep-dive-inner p{color:var(--ink);margin:0 0 .75rem;font-size:.9rem}.interactive-key-takeaway{background:var(--tint-purple);border:1px solid color-mix(in srgb, var(--purple) 30%, var(--border));border-left:4px solid var(--brand-gold);padding:1.25rem 1.5rem}.key-takeaway-header{align-items:center;gap:.5rem;margin-bottom:.75rem;display:flex}.key-takeaway-label{color:var(--brand-gold);font-size:.9rem;font-weight:800}.key-takeaway-content p,.key-takeaway-content li{color:var(--ink);font-size:.9rem;line-height:1.6}.quiz-player{max-width:760px}.quiz-header{z-index:20;color:var(--ink);background:color-mix(in srgb, var(--surface) 92%, transparent);border:1px solid var(--border);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-radius:14px;margin-bottom:1.5rem;padding:1rem 1.2rem;position:sticky;top:1rem}.quiz-header h2{margin-bottom:.4rem;font-size:1.45rem}.quiz-meta{color:var(--ink-muted);font-size:.85rem}.quiz-question{background:var(--surface);border:1px solid var(--border);border-radius:12px;margin-bottom:1rem;padding:1.2rem}.quiz-question h3{color:var(--ink);font-family:var(--font-body);margin-bottom:1rem;font-size:1rem;line-height:1.5}.quiz-options{gap:.55rem;display:grid}.quiz-option{color:var(--ink);background:var(--surface-soft);border:1px solid var(--border);text-align:left;cursor:pointer;border-radius:8px;align-items:flex-start;gap:.7rem;padding:.75rem .9rem;display:flex}.quiz-option:hover,.quiz-option.selected{background:var(--tint-blue);border-color:var(--blue)}.quiz-option-marker{color:var(--blue);font-size:1.05rem}.quiz-submit{margin-top:1.5rem}.quiz-submit .btn{color:var(--white);background:var(--blue);cursor:pointer;border:0;border-radius:999px;padding:.75rem 1.2rem;font-weight:800}.quiz-submit .btn:disabled{opacity:.45;cursor:not-allowed}@media (min-width:980px){.learn-resource-shell{grid-template-columns:minmax(0,1fr) 290px}.learn-resource-aside{position:sticky;top:6rem}}@media (max-width:768px){.flashcard,.flashcard-inner,.flashcard-front,.flashcard-back{min-height:190px}.flashcard-front p,.flashcard-back p{font-size:1rem}.dm-grid{grid-template-columns:1fr}.dm-definitions{flex-flow:wrap}.dm-def{flex:45%}.timeline-track{padding-left:1.5rem}.interactive-flashcards,.interactive-knowledge-check,.interactive-timeline,.interactive-drag-match{padding:1rem}}
