:root{--ink:#17372f;--green:#008f60;--muted:#6f7771;--line:#e3e7e2;--paper:#fcfcf9;--soft:#edf3ec;--white:#fff;--shadow:0 18px 55px #17372f10}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Arial,Helvetica,sans-serif;line-height:1.65}button,input{font:inherit}button,a{touch-action:manipulation}a{color:inherit}.skip-link{position:absolute;left:15px;top:-80px;background:#fff;padding:12px;z-index:100}.skip-link:focus{top:10px}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1060px)/2));border-bottom:1px solid var(--line);background:#fcfcf9ee;backdrop-filter:blur(12px);position:sticky;top:0;z-index:20}.atlas-brand{display:flex;align-items:center;gap:10px;text-decoration:none}.atlas-mark{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff;background:var(--green);font-family:Georgia,serif;font-size:20px}.atlas-brand b,.atlas-brand small{display:block;line-height:1}.atlas-brand b{font:400 19px Georgia,serif}.atlas-brand small{text-transform:uppercase;letter-spacing:1.8px;font-size:8px;margin-top:5px}.header-progress{display:flex;gap:12px;align-items:center;color:var(--muted);font-size:11px}.header-progress i{display:block;width:130px;height:4px;background:var(--line);overflow:hidden}.header-progress b{display:block;width:0;height:100%;background:var(--green);transition:.4s}.header-link{font-size:12px;text-decoration:none}.header-link span{color:var(--green);margin-left:8px}.hero{max-width:1060px;margin:auto;text-align:center;padding:92px 30px 60px}.kicker,.nav-label{text-transform:uppercase;letter-spacing:2px;font-size:10px;font-weight:700;color:var(--green)}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3{font-family:Georgia,serif;font-weight:400}h1{font-size:clamp(48px,7vw,78px);line-height:1.05;letter-spacing:-2.5px;margin:16px auto 27px;max-width:950px}h1 em{font-style:normal;color:var(--green)}.hero-lede{font-size:16px;line-height:1.8;color:var(--muted);max-width:680px;margin:0 auto}.hero-actions{display:flex;align-items:center;justify-content:center;gap:20px;margin:32px 0 62px}.hero-actions span{font-size:11px;color:var(--muted)}.button{border:0;border-radius:4px;padding:13px 19px;background:var(--green);color:#fff;text-decoration:none;font-size:12px;font-weight:700;cursor:pointer}.button:hover{background:#006c49}.button.small{padding:10px 15px}.hero-map{display:grid;grid-template-columns:1fr auto 1fr auto 1.25fr auto 1fr auto 1fr;align-items:stretch;border:1px solid var(--line);text-align:left}.hero-map>div{padding:18px;min-height:92px;display:flex;flex-direction:column;justify-content:space-between}.hero-map>span{align-self:center;color:#94a79e}.hero-map small{font-size:8px;letter-spacing:1px;color:var(--muted)}.hero-map b{font-size:12px}.hero-map .control{background:var(--soft);border-left:3px solid var(--green)}.hero-map .control small{color:var(--green)}.course-intro{max-width:900px;margin:10px auto 95px;padding:50px 30px;border-top:1px solid var(--line);display:grid;grid-template-columns:.9fr 1.1fr;gap:70px}.course-intro h2,.glossary h2,.finish h2{font-size:clamp(36px,5vw,56px);line-height:1.12;letter-spacing:-1.5px}.course-intro p{color:var(--muted);font-size:14px}.course-shell{max-width:1180px;margin:0 auto 100px;padding:0 24px;display:grid;grid-template-columns:230px 1fr;gap:42px}.lesson-nav{position:sticky;top:105px;align-self:start;border-top:1px solid var(--line)}.nav-label{padding:20px 10px 12px;margin:0}.lesson-tab{width:100%;display:grid;grid-template-columns:30px 1fr auto;gap:8px;text-align:left;border:0;border-bottom:1px solid var(--line);padding:17px 10px;background:transparent;color:var(--ink);cursor:pointer}.lesson-tab span,.lesson-tab small{font-size:9px;color:var(--muted)}.lesson-tab b{font-size:12px}.lesson-tab.active{background:var(--soft)}.lesson-tab.active span{color:var(--green)}.lesson-tab.complete b:after{content:"  ✓";color:var(--green)}.reset-btn{margin:16px 10px;border:0;background:none;padding:0;color:var(--muted);font-size:10px;text-decoration:underline;cursor:pointer}.lesson{display:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}.lesson.active{display:block;animation:fade .3s}.lesson-header{padding:54px 7%;background:var(--soft);border-bottom:1px solid var(--line)}.lesson-header>p{font-size:9px;letter-spacing:1.5px;color:var(--green)}.lesson-header h2{font-size:clamp(44px,6vw,68px);line-height:1;margin:12px 0 16px}.lesson-header span{color:var(--muted);font-size:14px}.lesson-block{padding:64px 7%;border-bottom:1px solid var(--line)}.lesson-block h3,.check-card h3{font-size:clamp(28px,4vw,44px);line-height:1.18;letter-spacing:-.8px;max-width:760px}.lead{font:19px/1.75 Georgia,serif;color:#415347;max-width:800px}.short-answer{margin-top:30px;background:var(--soft);border-left:3px solid var(--green);padding:22px 25px}.short-answer b{font-size:10px;text-transform:uppercase;letter-spacing:1px}.short-answer p{font:17px/1.65 Georgia,serif;margin:8px 0 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px}.stack-map{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin:32px 0 20px}.actor{min-height:118px;border:0;background:#fff;color:var(--ink);text-align:left;padding:17px;cursor:pointer}.actor span,.actor b,.actor small{display:block}.actor span{font-size:9px;color:var(--muted)}.actor b{font-size:13px;margin:24px 0 4px}.actor small{font-size:10px;color:var(--muted)}.actor.upstream{background:#f4f8f4}.actor.active{box-shadow:inset 0 -4px var(--green);background:#e7f2eb}.flow-caption{display:flex;gap:22px;border-left:3px solid var(--green);padding:12px 16px;background:var(--paper);font-size:13px}.flow-caption b{color:var(--green);min-width:130px}.role-list{display:grid;grid-template-columns:1fr 1fr;margin-top:30px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.role-list>div{padding:23px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.role-list b{font:400 20px Georgia,serif}.role-list p,.evidence-grid p{font-size:12px;color:var(--muted);margin:9px 0 0}.note{font-size:11px;color:var(--muted);margin:24px 0 0}.check-card{margin:48px 7% 64px;padding:38px;background:var(--ink);color:#fff}.check-card>p{font-size:9px;letter-spacing:1.5px;color:#91d8b9}.quiz-options{display:flex;gap:8px;flex-wrap:wrap}.quiz-options button{background:transparent;color:#fff;border:1px solid #ffffff55;padding:10px 14px;border-radius:3px;cursor:pointer}.quiz-options button:hover{background:#fff;color:var(--ink)}.quiz-options button.correct{background:#9fd5ba;color:var(--ink);border-color:#9fd5ba}.quiz-options button.wrong{background:#dca39a;color:var(--ink);border-color:#dca39a}.quiz-feedback{min-height:24px;margin-top:13px;font-size:12px}.lifecycle{list-style:none;padding:0;margin:34px 0 0}.lifecycle li{display:grid;grid-template-columns:54px 1fr;gap:22px;padding:22px 0;border-top:1px solid var(--line)}.lifecycle li>span{color:var(--green);font-size:10px}.lifecycle b{font:400 23px Georgia,serif}.lifecycle p{color:var(--muted);font-size:13px;margin:6px 0 0}.operation-grid{display:flex;flex-wrap:wrap;margin-top:27px}.operation-grid span{padding:9px 12px;border:1px solid var(--line);margin:-1px 0 0 -1px;font-size:11px}.buyer-question{margin:0;padding:45px 7%;background:var(--soft);border-bottom:1px solid var(--line)}.buyer-question>p{font-size:9px;text-transform:uppercase;letter-spacing:1.5px;color:var(--green)}blockquote{font:400 25px/1.5 Georgia,serif;margin:0}.decision-lab,.proof-list{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin:28px 0 18px}.decision-lab label,.proof-list label{background:#fff;padding:17px;font-size:12px;cursor:pointer}.decision-lab input,.proof-list input{accent-color:var(--green);margin-right:8px}.recommendation{background:var(--ink);color:#fff;padding:25px}.recommendation small,.recommendation b{display:block}.recommendation small{color:#91d8b9;font-size:9px;letter-spacing:1.4px}.recommendation b{font:400 24px Georgia,serif;margin:8px 0}.recommendation p{font-size:12px;color:#c7d1cc;margin:0}.role-list.two>div{min-height:170px}.evidence-grid{display:grid;grid-template-columns:1fr 1fr;margin-top:30px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.evidence-grid>div{padding:24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.evidence-grid span{font-size:9px;color:var(--green)}.evidence-grid b{display:block;font:400 20px Georgia,serif;margin-top:23px}.glossary{max-width:900px;margin:0 auto;padding:40px 30px 100px}.search-box{font-size:11px;color:var(--muted);border-bottom:1px solid var(--ink);padding:8px}.search-box input{border:0;background:none;outline:0;margin-left:8px}.glossary-grid{display:grid;grid-template-columns:1fr 1fr;margin-top:30px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.term{padding:22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;min-height:130px}.term b{font:400 18px Georgia,serif}.term p{font-size:12px;color:var(--muted);margin:8px 0}.finish{text-align:center;background:var(--soft);padding:90px 25px}.finish-score{width:150px;height:150px;border:1px solid var(--green);border-radius:50%;display:flex;flex-direction:column;justify-content:center;margin:30px auto}.finish-score span{font:400 33px Georgia,serif}.finish-score small{font-size:9px;color:var(--muted)}footer{max-width:1060px;margin:auto;border-top:1px solid var(--line);padding:30px;display:flex;justify-content:space-between;align-items:center;gap:25px;font-size:11px;color:var(--muted)}footer p{margin:0}.inverse{color:var(--ink)}footer>a:last-child{color:var(--green)}@keyframes fade{from{opacity:0;transform:translateY(5px)}}@media(max-width:900px){.header-progress{display:none}.hero-map{grid-template-columns:1fr}.hero-map>span{transform:rotate(90deg)}.hero-map>div{text-align:center;min-height:74px}.course-intro{grid-template-columns:1fr;gap:15px}.course-shell{grid-template-columns:1fr}.lesson-nav{position:relative;top:0;display:flex;overflow:auto}.nav-label,.reset-btn{display:none}.lesson-tab{min-width:190px}.stack-map{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.topbar{height:68px;padding:0 16px}.header-link{font-size:0}.header-link span{font-size:18px}.hero{padding:65px 18px 40px}h1{font-size:46px;letter-spacing:-1.4px}.hero-actions{flex-direction:column}.course-intro{margin-bottom:55px;padding:35px 20px}.course-shell{padding:0 10px}.lesson-header,.lesson-block{padding:45px 24px}.section-heading{align-items:start;flex-direction:column}.stack-map,.role-list,.decision-lab,.proof-list,.evidence-grid,.glossary-grid{grid-template-columns:1fr}.flow-caption{flex-direction:column;gap:3px}.check-card{margin:30px 18px 48px;padding:28px 22px}.glossary{padding:25px 20px 70px}.finish{padding:70px 20px}footer{flex-direction:column;text-align:center}}