@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap";:root{--font-heading:"Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono:"JetBrains Mono", Consolas, "SFMono-Regular", Menlo, monospace;--ink:#162215;--ink-light:#3e4a3c;--muted:#5e6b5c;--muted-soft:#7a8878;--green:#3ca215;--green-dark:#2b7d0e;--green-pale:#edf7e8;--line:#e3ebd0;--line-subtle:#edf2e8;--soft:#f7faf5;--sidebar:340px;font-family:var(--font-body);color:var(--ink);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#fff}*{box-sizing:border-box}body{min-width:320px;color:var(--ink);background:#fff;margin:0;line-height:1.6}button,a,input{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}h1,h2,h3,h4,p{margin-top:0}.app-shell{min-height:100vh}.topbar{z-index:20;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line-subtle);background:#fffffff5;justify-content:space-between;align-items:center;height:76px;padding:0 36px;display:flex;position:sticky;top:0}.brand{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:12px;display:flex}.brand-mark{background:var(--green);color:#fff;border-radius:12px;place-items:center;width:42px;height:42px;transition:transform .18s;display:grid;box-shadow:0 5px 14px #3ca21540}.brand:hover .brand-mark{transform:scale(1.04)}.brand-text{flex-direction:column;gap:2px;display:flex}.brand-text strong{font:800 16px/1.2 var(--font-heading);letter-spacing:-.3px;color:var(--ink)}.brand-text span{color:var(--muted);font-size:13px;font-weight:500}.top-actions{align-items:center;gap:14px;display:flex}.repo-link{border:1px solid var(--line);color:var(--ink-light);background:#fff;border-radius:10px;align-items:center;gap:8px;padding:10px 15px;font-size:13px;font-weight:600;transition:all .2s;display:flex}.repo-link:hover{background:var(--green-pale);color:var(--green-dark);border-color:#badfa9}.mobile-menu-btn{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:10px;padding:9px;display:none}.layout{padding-left:var(--sidebar);align-items:stretch;min-height:calc(100vh - 76px);transition:padding-left .25s;display:flex}.sidebar-collapsed .layout{padding-left:0}.main-content{width:100%;min-width:0;max-width:1260px;margin:0 auto;padding:32px 48px 40px;transition:max-width .25s,padding .25s}.sidebar-collapsed .main-content{max-width:1360px;padding-left:56px;padding-right:56px}.sidebar{width:var(--sidebar);flex:0 0 var(--sidebar);border-right:1px solid var(--line-subtle);z-index:15;background:#fff;flex-direction:column;height:calc(100vh - 76px);padding:26px 20px 22px;transition:transform .25s,width .25s,flex-basis .25s;display:flex;position:fixed;top:76px;left:0;overflow-y:auto}.sidebar-collapsed .sidebar{transform:translate(-100%)}.sidebar-head{justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:22px;display:flex}.sidebar-label{letter-spacing:1.2px;color:var(--muted-soft);text-transform:uppercase;font-size:11px;font-weight:800}.sidebar-head h2{font:800 17px/1.3 var(--font-heading);letter-spacing:-.4px;color:var(--ink);white-space:nowrap;margin:6px 0 0}.collapse-btn{border:1px solid var(--line);color:var(--muted);background:#fff;border-radius:9px;flex:0 0 34px;place-items:center;width:34px;height:34px;transition:all .18s;display:grid}.collapse-btn:hover{background:var(--green-pale);color:var(--green-dark);border-color:#cce3c2}.expand-floating{z-index:18;color:var(--green-dark);background:#fff;border:1px solid #d5e6cb;border-radius:11px;align-items:center;gap:7px;padding:10px 14px;font-size:13px;font-weight:700;transition:all .18s;display:flex;position:fixed;top:92px;left:14px;box-shadow:0 6px 20px #2d5d1b24}.expand-floating:hover{background:var(--green-pale);transform:translateY(-1px)}.mobile-backdrop{display:none}.progress-box{border:1px solid var(--line);background:#f8faf6;border-radius:12px;margin-bottom:22px;padding:16px}.progress-label{color:var(--ink-light);justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;font-weight:500;display:flex}.progress-label strong{font:800 14px var(--font-heading);color:var(--green-dark)}.progress-track{background:#e1e9dc;border-radius:99px;height:6px;overflow:hidden}.progress-fill{background:var(--green);border-radius:99px;height:100%;transition:width .25s}.progress-caption{color:var(--muted);margin-top:9px;font-size:12px;font-weight:500;display:block}.module-nav{flex-direction:column;gap:6px;display:flex}.module-link{text-align:left;width:100%;color:var(--ink-light);background:0 0;border:1px solid #0000;border-radius:12px;align-items:center;gap:12px;padding:12px 10px;transition:all .18s;display:flex}.module-link:hover{background:#f6f9f4}.module-link.active{background:var(--green-pale);color:var(--green-dark);border-color:#dbeed0}.module-icon{width:36px;height:36px;color:var(--muted);background:#f3f6f1;border-radius:10px;flex:0 0 36px;place-items:center;transition:all .18s;display:grid}.module-link.active .module-icon{color:var(--green-dark);background:#dbeed0}.module-text{flex-direction:column;flex:1;gap:3px;min-width:0;display:flex}.module-text strong{font:700 13px/1.35 var(--font-heading);color:var(--ink)}.module-link.active .module-text strong{color:var(--green-dark)}.module-text small{color:var(--muted);font-size:11.5px;font-weight:500}.module-state{width:18px;color:var(--green);flex:0 0 18px;place-items:center;display:grid}.active-dot{background:var(--green);border-radius:50%;width:8px;height:8px;box-shadow:0 0 0 3px #3ea31633}.module-empty{background:#d4dcd0;border-radius:50%;width:7px;height:7px}.sidebar-bottom{border-top:1px solid var(--line-subtle);align-items:flex-start;gap:12px;margin-top:auto;padding:22px 4px 16px;display:flex}.help-icon{width:34px;height:34px;color:var(--muted);background:#f1f5ee;border-radius:10px;flex:0 0 34px;place-items:center;display:grid}.help-copy{flex-direction:column;gap:4px;display:flex}.help-copy strong{color:var(--ink);font-size:13px}.help-copy span{color:var(--muted);font-size:12px;line-height:1.5}.help-copy a{color:var(--green-dark);align-items:center;gap:5px;margin-top:2px;font-size:12px;font-weight:700;display:flex}.github-card{border:1px solid var(--line);color:var(--green-dark);background:#fbfdfa;border-radius:12px;align-items:center;gap:12px;padding:13px 14px;transition:all .18s;display:flex}.github-card:hover{background:var(--green-pale);border-color:#badfa9}.github-card>span{flex-direction:column;flex:1;gap:3px;min-width:0;display:flex}.github-card strong{color:var(--ink);font-size:13px}.github-card 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44px;display:flex;position:relative;overflow:hidden}.welcome-copy{z-index:2;max-width:600px;position:relative}.eyebrow,.section-kicker{letter-spacing:1.25px;color:var(--green-dark);text-transform:uppercase;align-items:center;gap:8px;font-size:11.5px;font-weight:800;display:flex}.eyebrow-dot{background:var(--green);border-radius:50%;width:8px;height:8px}h1{font:800 clamp(32px, 3.8vw, 48px)/1.16 var(--font-heading);letter-spacing:-1.4px;color:var(--ink);text-wrap:balance;margin:18px 0 16px}h1 span{color:var(--green-dark)}.welcome-copy>p{color:var(--ink-light);text-wrap:pretty;max-width:500px;margin-bottom:26px;font-size:16px;line-height:1.7}.welcome-actions{align-items:center;gap:20px;display:flex}.primary-btn,.secondary-btn,.complete-btn{border-radius:11px;justify-content:center;align-items:center;gap:9px;padding:13px 18px;font-size:13.5px;font-weight:700;transition:all .18s;display:inline-flex}.primary-btn{background:var(--green);color:#fff;border:1px solid var(--green);box-shadow:0 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#cfe4c3;border-radius:50%;width:220px;height:220px;position:absolute}.orbit-two{opacity:.65;border-style:dashed;width:295px;height:295px}.float-card{z-index:3;color:var(--ink-light);background:#fff;border:1px solid #e2ebd9;border-radius:12px;align-items:center;gap:8px;padding:10px 14px;font-size:12px;font-weight:700;display:flex;position:absolute;box-shadow:0 8px 24px #2d5d1b1f}.float-card svg:first-child{color:var(--green)}.float-card svg:last-child{color:#4eaa2d}.float-card-top{top:68px;right:14px}.float-card-bottom{bottom:56px;left:8px}.green-spark{background:var(--green);border-radius:2px;width:9px;height:9px;position:absolute;transform:rotate(45deg)}.spark-one{top:60px;left:64px}.spark-two{background:#9bcf83;width:6px;height:6px;bottom:66px;right:42px}.stats-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:22px 0 38px;display:grid}.stat-card{border:1px solid var(--line);background:#fff;border-radius:14px;align-items:center;gap:14px;min-width:0;padding:18px 16px;transition:all .18s;display:flex}.stat-card:hover{border-color:#c9e3bc;box-shadow:0 4px 14px #2d5d1b0f}.stat-icon{background:var(--green-pale);width:42px;height:42px;color:var(--green-dark);border-radius:12px;flex:0 0 42px;place-items:center;display:grid}.stat-card>div:last-child{flex-direction:column;gap:4px;min-width:0;display:flex}.stat-card strong{font:700 14px/1.3 var(--font-heading);color:var(--ink);white-space:nowrap}.stat-card span{color:var(--muted);white-space:nowrap;font-size:12.5px}.lesson-heading{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:20px;display:flex}.lesson-heading h2{font:800 28px/1.28 var(--font-heading);letter-spacing:-.7px;color:var(--ink);text-wrap:balance;margin:9px 0 10px}.lesson-heading p{color:var(--ink-light);text-wrap:pretty;max-width:800px;margin-bottom:0;font-size:15px;line-height:1.7}.duration{color:var(--muted);white-space:nowrap;align-items:center;gap:6px;padding-top:18px;font-size:13px;font-weight:600;display:flex}.objective-card{background:#f7fbf4;border:1px solid #e4efdd;border-radius:14px;align-items:flex-start;gap:15px;margin-bottom:30px;padding:18px 20px;display:flex}.objective-icon{width:40px;height:40px;color:var(--green-dark);background:#e3f2d9;border-radius:12px;flex:0 0 40px;place-items:center;display:grid}.objective-card strong{font:700 14.5px var(--font-heading);color:var(--ink)}.objective-card p{color:var(--ink-light);text-wrap:pretty;margin:6px 0 0;font-size:14px;line-height:1.68}.section-title-row{justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.section-title-row h3,.exercise-header h3{font:800 18px var(--font-heading);letter-spacing:-.35px;color:var(--ink);margin:0}.section-title-row>span{color:var(--muted);background:#f3f6f1;border-radius:8px;padding:6px 10px;font-size:12px;font-weight:600}.steps-section{margin-bottom:32px}.steps-list{flex-direction:column;gap:16px;display:flex}.step-card{border:1px solid var(--line);background:#fff;border-radius:14px;gap:16px;padding:20px 22px;transition:all .18s;display:flex}.step-card:hover{border-color:#cde6c1;box-shadow:0 4px 18px #2d5d1b0d}.step-number{background:var(--green-pale);width:34px;height:34px;color:var(--green-dark);font:800 13px var(--font-heading);border-radius:10px;flex:0 0 34px;place-items:center;display:grid}.step-body{flex:1;min-width:0}.step-body h4{font:700 16px/1.35 var(--font-heading);color:var(--ink);margin:2px 0 8px}.step-desc{color:var(--ink-light);white-space:pre-line;text-wrap:pretty;margin-bottom:14px;font-size:14.5px;line-height:1.7}.step-links-row{flex-wrap:wrap;gap:10px;margin:-4px 0 14px;display:flex}.step-link-badge{background:var(--green-pale);color:var(--green-dark);border:1px solid #d4ebca;border-radius:9px;align-items:center;gap:6px;padding:7px 13px;font-size:12.5px;font-weight:600;text-decoration:none;transition:all .18s;display:inline-flex}.step-link-badge:hover{color:#1b5b0b;background:#e3f4da;border-color:#b7e2a4;transform:translateY(-1px)}.step-tip-box,.step-warning-box{border-radius:12px;align-items:flex-start;gap:13px;margin:12px 0 16px;padding:14px 18px;font-size:14px;line-height:1.6;display:flex}.step-tip-box{border:1px solid #dcebd4;border-left:4px solid var(--green);color:var(--ink-light);background:#fbfdf9}.step-tip-box svg{color:#df9e08;flex:0 0 19px;margin-top:2px}.step-tip-box strong{color:var(--ink);margin-right:6px;font-weight:700;display:inline}.step-warning-box{color:#5c4314;background:#fffcf5;border:1px solid #f9e2b8;border-left:4px solid #e27d14}.step-warning-box svg{color:#d97706;flex:0 0 19px;margin-top:2px}.step-warning-box strong{color:#7c2d12;margin-right:6px;font-weight:700;display:inline}.step-tip-box div,.step-warning-box div{white-space:pre-line;flex:1}.snippet{color:#eef5e9;background:#192019;border:1px solid #2e3b2c;border-radius:11px;overflow:hidden;box-shadow:0 4px 14px #0a140a1f}.snippet-top{color:#c4d3bc;border-bottom:1px solid #2d382b;justify-content:space-between;align-items:center;height:40px;padding:0 14px;font-size:12px;font-weight:500;display:flex}.snippet-top>span{align-items:center;gap:8px;display:flex}.terminal-dot{background:#68bf48;border-radius:50%;width:8px;height:8px;box-shadow:0 0 0 3px #68bf4838}.copy-btn{color:#e5efe1;background:#273325;border:1px solid #455442;border-radius:8px;align-items:center;gap:6px;padding:6px 11px;font-size:11.5px;font-weight:600;transition:all .15s;display:flex}.copy-btn:hover{background:#364833;border-color:#5c7057}.snippet pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.8 var(--font-mono);color:#e4f5db;margin:0;padding:16px 18px;overflow-x:auto}.exercise-card{background:linear-gradient(120deg,#fbfdf9,#f7fbf3);border:1px solid #e0ecda;border-radius:15px;margin-bottom:26px;padding:24px}.exercise-header{align-items:center;gap:13px;margin-bottom:14px;display:flex}.exercise-icon{width:42px;height:42px;color:var(--green-dark);background:#e6f5dc;border-radius:12px;place-items:center;display:grid}.exercise-header .section-kicker{margin-bottom:4px;font-size:10px}.exercise-header h3{font-size:17px}.exercise-card>p{color:var(--ink-light);text-wrap:pretty;margin:0 0 18px;font-size:15px;line-height:1.75}.exercise-repo{color:var(--muted);border-top:1px solid #e1ebdc;flex-wrap:wrap;align-items:center;gap:9px;padding-top:15px;font-size:12.5px;display:flex}.exercise-repo>svg{color:var(--green-dark)}.exercise-repo a{color:var(--green-dark);align-items:center;gap:5px;font-size:13px;font-weight:700;display:flex}.checklist-card{border:1px solid var(--line);background:#fff;border-radius:15px;margin-bottom:26px;padding:24px}.checklist-card .section-title-row{align-items:flex-start}.checklist-card .section-title-row p{color:var(--muted);margin:6px 0 0;font-size:13.5px}.check-count{color:var(--green-dark)!important;background:var(--green-pale)!important;padding:6px 11px!important;font-size:12.5px!important;font-weight:700!important}.checklist{flex-direction:column;gap:0;margin-top:8px;display:flex}.check-item{cursor:pointer;color:var(--ink);border-top:1px solid #f0f4ee;align-items:flex-start;gap:13px;padding:13px 4px;font-size:14px;line-height:1.6;transition:all .15s;display:flex}.check-item:hover{background:#fafcf9}.check-item input{opacity:0;width:1px;height:1px;position:absolute}.custom-check{color:#0000;border:1.5px solid #cbd7c4;border-radius:6px;flex:0 0 20px;place-items:center;width:20px;height:20px;margin-top:1px;transition:all .15s;display:grid}.check-item.checked .custom-check{background:var(--green);border-color:var(--green);color:#fff}.check-item.checked>span:last-child{color:var(--muted-soft);text-decoration:line-through}.check-item input:focus-visible+.custom-check{outline:2px solid var(--green);outline-offset:2px}.lesson-footer{justify-content:space-between;align-items:center;gap:12px;padding:12px 0 36px;display:flex}.secondary-btn{border:1px solid var(--line);color:var(--ink-light);background:#fff}.secondary-btn:hover:not(:disabled){background:#f7faf5;border-color:#cadfc2}.complete-btn{border:1px solid var(--line);color:var(--ink-light);background:#f5f8f3}.complete-btn:hover{background:var(--green-pale);border-color:#b9dda9}.complete-btn.is-complete{background:var(--green-pale);color:var(--green-dark);border-color:#c9e6bd}.next-btn{margin-left:auto}.footer{border-top:1px solid var(--line-subtle);color:var(--muted);justify-content:space-between;gap:15px;padding:22px 0 26px;font-size:12px;font-weight:500;display:flex}.concepts-view{padding-bottom:30px;animation:.22s ease-out fadeIn}.concepts-hero{background:linear-gradient(115deg,#f8fcf5 0%,#f2faee 50%,#eaf6e5 100%);border:1px solid #dcebd4;border-radius:20px;margin-bottom:28px;padding:34px 38px;position:relative;overflow:hidden}.concepts-hero h2{font:800 clamp(26px, 3.2vw, 38px)/1.2 var(--font-heading);letter-spacing:-1px;color:var(--ink);margin:12px 0 10px}.concepts-hero p{color:var(--ink-light);max-width:760px;margin:0;font-size:15.5px;line-height:1.7}.concepts-meta-row{flex-wrap:wrap;align-items:center;gap:16px;margin-top:18px;display:flex}.concepts-badge{color:var(--green-dark);background:#fff;border:1px solid #cce5c2;border-radius:999px;align-items:center;gap:6px;padding:5px 12px;font-size:12.5px;font-weight:700;display:inline-flex}.concepts-section{margin-bottom:38px}.concepts-section-head{margin-bottom:18px}.concepts-section-head h3{font:800 21px/1.3 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#234b140d}.evidence-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:16px;display:flex}.evidence-header-left{align-items:center;gap:14px;display:flex}.evidence-icon-circle{background:var(--green-pale);width:44px;height:44px;color:var(--green-dark);border-radius:12px;flex:0 0 44px;place-items:center;display:grid}.evidence-header h3{font:800 18px var(--font-heading);color:var(--ink);margin:0 0 3px}.evidence-header p{color:var(--muted);margin:0;font-size:13px}.evidence-guide-box{color:var(--ink);background:#f7faf5;border:1px solid #dcead6;border-radius:10px;margin-bottom:18px;padding:12px 16px;font-size:13.5px;line-height:1.55}.evidence-guide-box strong{color:var(--green-dark)}.evidence-dropzone{text-align:center;cursor:pointer;background:#fdfefd;border:2px dashed #b7dcb0;border-radius:14px;outline:none;padding:26px 20px;transition:all .2s}.evidence-dropzone:hover,.evidence-dropzone:focus{border-color:var(--green);background:#f6fcf3;box-shadow:0 4px 14px #2d5d1b14}.evidence-dropzone.is-dragover{border-color:var(--green-dark);background:#eef8ea}.dropzone-inner{flex-direction:column;align-items:center;gap:8px;display:flex}.dropzone-inner svg{color:var(--green)}.dropzone-title{font:700 15px var(--font-heading);color:var(--ink)}.dropzone-desc{color:var(--muted);font-size:13px}.dropzone-shortcut{color:var(--green-dark);font:700 11px var(--font-code);background:#eef5e9;border:1px solid #d2e7ca;border-radius:6px;margin-top:4px;padding:3px 10px;display:inline-block}.evidence-link-box{border-top:1px dashed var(--line);flex-direction:column;gap:8px;margin-top:18px;padding-top:16px;display:flex}.evidence-link-box label{font:700 13px var(--font-heading);color:var(--ink)}.evidence-link-row{gap:10px;display:flex}.evidence-link-row input{border:1px solid var(--line);border-radius:10px;outline:none;flex:1;padding:10px 14px;font-size:13.5px}.evidence-link-row input:focus{border-color:var(--green);box-shadow:0 0 0 3px #3ea31626}.evidence-attached-preview{background:#f7fbf5;border:1px solid #c8e7bd;border-radius:12px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;display:flex}.attached-media-thumb{object-fit:cover;cursor:pointer;border:1px solid #c2dfb5;border-radius:8px;max-width:130px;max-height:80px;box-shadow:0 2px 8px #00000014}.attached-info{flex:1;min-width:200px}.attached-info strong{font:700 14px var(--font-heading);color:#17540a;align-items:center;gap:6px;margin-bottom:4px;display:flex}.attached-info span{color:var(--muted);font-size:12px;display:block}.attached-link-preview{color:var(--green-dark);background:#e8f4e4;border-radius:6px;align-items:center;gap:6px;margin-top:4px;padding:4px 10px;font-size:13px;font-weight:600;text-decoration:none;display:inline-flex}.attached-actions{gap:8px;display:flex}.missing-evidence-modal-box{width:100%;max-width:580px}.missing-list{flex-direction:column;gap:12px;max-height:55vh;margin:16px 0 24px;display:flex;overflow-y:auto}.missing-item{background:#fffcf5;border:1px solid #f6e2b5;border-radius:12px;justify-content:space-between;align-items:center;gap:14px;padding:14px 16px;display:flex}.missing-item-info{flex:1;min-width:0}.missing-item-info strong{font:700 14px var(--font-heading);color:#7c2d12;margin-bottom:2px;display:block}.missing-item-info span{color:#63471c;font-size:12.5px;display:block}.missing-item button{white-space:nowrap}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}