.backend{--accent:#087b68;--selected:#e4f4ed}.backend.night{--accent:#7fe1c5;--selected:#17392f}.backend-nav{display:flex;gap:12px;padding:0 32px;border-bottom:1px solid var(--line);background:var(--surface);overflow:auto}.backend-nav button{display:flex;align-items:center;gap:8px;min-height:56px;padding:0 16px;border-bottom:3px solid transparent;white-space:nowrap}.backend-nav button[aria-selected=true]{color:var(--accent);border-color:var(--accent);font-weight:700}.backend-nav span{font-size:11px;background:var(--soft);padding:2px 6px;border-radius:4px}.backend-main{max-width:1320px;margin:auto;padding:28px 32px 64px;min-height:75vh}.backend-title{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px}.backend-title p{margin:8px 0 0;color:var(--muted);max-width:750px}.backend-title .eyebrow{color:var(--accent);margin:0 0 6px}.backend h1{font-size:30px}.backend .secondary,.code-actions button,.lesson-actions button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);border-radius:5px;padding:10px 14px;background:var(--surface);font-size:12px;min-height:42px}.backend-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.route-tool{min-width:0;border:1px solid var(--line);border-radius:8px;padding:20px;background:var(--surface)}.tool-heading{display:flex;align-items:center;gap:10px;margin-bottom:20px}.tool-heading h2{margin:0;font-size:18px}.tool-heading>span{margin-left:auto;color:var(--muted);font:12px monospace}.tool-heading svg{color:var(--accent)}.backend label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:700;margin-bottom:14px;min-width:0}.backend input:not([type=checkbox]),.backend textarea,.backend select{width:100%;min-width:0;border:1px solid var(--line);border-radius:5px;background:var(--bg);padding:10px 12px;color:var(--ink);font:13px/1.6 monospace;min-height:42px}.backend textarea{resize:vertical}.backend textarea:disabled{opacity:.55}.field-row{display:grid;grid-template-columns:140px minmax(0,1fr);gap:12px}.backend fieldset{border:0;border-top:1px solid var(--line);margin:12px 0 0;padding:12px 0 0}.backend legend{font-size:11px;color:var(--muted);padding-right:12px}.backend .toggle{flex-direction:row;align-items:center;gap:10px;min-height:32px;font-weight:400;margin-bottom:6px}.backend input[type=checkbox]{accent-color:#087b68;width:17px;height:17px}.backend .run-route{display:flex;align-items:center;justify-content:center;gap:9px;width:100%;background:#076b57;color:#fff;padding:13px;border-radius:5px;font-weight:700;margin-top:20px}.request-summary{border-left:3px solid var(--accent);padding:12px;background:var(--soft);overflow-wrap:anywhere}.request-summary span{display:block;font:11px monospace;color:var(--muted);margin-top:6px}.backend .tool-note{font-size:11px;color:var(--muted);line-height:1.7;overflow-wrap:anywhere}.route-results{margin-top:24px;min-width:0}.route-results .result-heading{margin:0;background:var(--surface);padding:0 12px;border:1px solid var(--line)}.route-results .result-heading>span{font:12px monospace;white-space:nowrap}.backend pre{border-radius:0 0 6px 6px;min-height:120px;max-height:480px}.backend-empty{padding:35px;text-align:center;border-bottom:1px solid var(--line);background:var(--surface)}.backend-empty svg{color:var(--accent)}.backend-empty h2{margin:10px 0}.backend-empty p{color:var(--muted);margin:0}.code-actions{display:flex;gap:10px;justify-content:flex-end;padding:10px 0}.execution{margin-top:28px}.execution h2{font-size:17px}.execution ol{padding:0;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px}.execution li{display:flex;gap:10px;border-top:2px solid var(--accent);padding-top:12px;min-width:0}.execution li>span{font:12px monospace;color:var(--accent)}.execution strong{font-size:12px}.execution p{font-size:11px;color:var(--muted);overflow-wrap:anywhere}.assignment{border-left:4px solid var(--accent);background:var(--selected);padding:18px 22px;margin-bottom:24px;display:flex;gap:20px;justify-content:space-between}.assignment h2{margin:5px 0;font-size:18px}.assignment p{margin:6px 0;font-size:13px}.assignment-actions{display:flex;flex-direction:column;gap:6px;min-width:150px}.assignment-actions button{display:flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);border-radius:4px;padding:8px;font-size:12px;min-height:40px}.assignment .hint{font-style:italic}.exercise-list{display:grid;grid-template-columns:1fr 1fr;gap:0 32px}.exercise-list article{display:flex;gap:18px;align-items:flex-start;border-top:1px solid var(--line);padding:22px 0}.exercise-number{min-width:28px;color:var(--accent);font:22px monospace}.exercise-list h2{font-size:17px;margin:5px 0}.exercise-list p{font-size:12px;color:var(--muted);margin:5px 0}.exercise-list small,.lesson-content>small{font-size:10px;color:var(--accent);font-weight:700}.exercise-list article>div{flex:1}.exercise-list article>button{min-width:44px;height:44px;border:1px solid var(--line);border-radius:5px}.lesson-layout{display:grid;grid-template-columns:285px minmax(0,1fr);gap:32px}.lesson-layout nav{display:flex;flex-direction:column;gap:5px;max-height:670px;overflow:auto;padding-right:10px}.lesson-layout nav button{display:flex;gap:10px;align-items:flex-start;text-align:left;padding:12px;font-size:12px;border-left:3px solid transparent}.lesson-layout nav button span{font:12px monospace;color:var(--muted);min-width:20px}.lesson-layout nav button[aria-current=true]{background:var(--selected);color:var(--accent);border-left-color:var(--accent)}.lesson-content,.slide-content{min-width:0}.lesson-content h2{font-size:25px;margin:8px 0 16px}.lesson-content>p{font-size:15px;line-height:1.9;color:var(--muted);margin-bottom:24px}.lesson-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}.source-link{display:inline-block;margin-top:24px;text-decoration:underline!important;font-size:12px;color:var(--accent)!important}.slide-controls{display:flex;gap:15px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:10px}.slide-content h2{font-size:27px;white-space:pre-line;line-height:1.4}.slide-text{white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.85 LabPoppins,Arial,sans-serif}.slide-text p{margin:12px 0}.backend details{padding:12px 0}.backend summary{cursor:pointer;font-size:12px}.backend label small{font-weight:400;color:var(--muted)}@media(max-width:800px){.backend-main{padding:22px 16px 40px}.backend-nav{padding:0 12px;gap:0}.backend-nav button{padding:0 12px;font-size:12px}.backend-grid{grid-template-columns:1fr;gap:16px}.backend h1{font-size:25px}.backend-title{align-items:flex-start;flex-wrap:wrap;gap:12px}.backend-title p{font-size:12px}.route-tool{padding:16px}.exercise-list{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr;gap:20px}.lesson-layout nav{max-height:200px;border-bottom:1px solid var(--line);padding-bottom:12px}.assignment{flex-direction:column;padding:14px;gap:10px}.assignment-actions{flex-direction:row;flex-wrap:wrap}.assignment-actions button{flex:1}.backend input:not([type=checkbox]),.backend textarea,.backend select{font-size:16px}.field-row{grid-template-columns:115px minmax(0,1fr);gap:10px}.route-results .result-heading{padding:0 6px}.route-results .result-heading>span{font-size:10px}.backend .header-actions a{font-size:10px}.backend .academy-brand>span{font-size:17px}.backend .academy-brand img{width:80px}.backend .lab-header,.backend .header-actions{gap:6px}.backend .header-actions a[href="/portfolio"]{font-size:0}.lesson-content h2,.slide-content h2{font-size:22px}.execution ol{grid-template-columns:1fr 1fr}.backend .run-route{min-height:48px}}@media(prefers-reduced-motion:reduce){.backend *{scroll-behavior:auto!important}}