:root{color:#25191b;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--peach:#ff9a8b;--peach-strong:#f05f73;--cream:#fff7ec;--rose:#ffe4eb;--ink:#25191b;--muted:#806d70;--line:#502f3621;--card:#ffffffc2;--shadow:0 24px 80px #7a413629;background:#fff7f1;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(circle at 0 0,#ff9a8b54,#0000 34rem),radial-gradient(circle at 70% 20%,#ffd87440,#0000 28rem),linear-gradient(135deg,#fff9f2 0%,#ffeef4 48%,#f8fbff 100%);min-width:320px;min-height:100vh;margin:0}button,textarea{font:inherit}button{cursor:pointer}.app-shell{grid-template-columns:380px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffff8a;height:100vh;padding:24px;position:sticky;top:0;overflow:auto}.brand-card,.module-card,.card,.feedback,.roadmap,.graduation-challenges,.dashboard-card,.topbar{border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.brand-card{border-radius:28px;align-items:center;gap:16px;margin-bottom:18px;padding:18px;display:flex}.brand-orb{color:#fff;background:linear-gradient(135deg,#ff8d7a,#f05f73 55%,#8d5cf6);border-radius:24px;flex:none;place-items:center;width:64px;height:64px;font-size:28px;font-weight:900;display:grid;box-shadow:0 16px 38px #f05f7359}.brand-card h1,.hero h2,.roadmap h2{letter-spacing:-.04em;margin:0}.brand-card p,.module-card p,.hero p,.roadmap p,.feedback p{color:var(--muted);line-height:1.7}.assist-panel{background:linear-gradient(135deg,#ffffffd1,#efe1ffad);border-color:#8d5cf633;gap:14px;display:grid}.assist-panel.is-locked{border-style:dashed}.assist-panel h3,.assist-panel p{margin:0}.assist-panel small{color:var(--muted);line-height:1.6}.mock-api-panel{border-color:#f05f732e;gap:12px;display:grid}.mock-api-status{color:var(--ink);background:#ffeff3e6;border-radius:14px;padding:10px 12px;font-size:14px}.mock-api-form{gap:10px;display:grid}.mock-api-form input,.mock-api-output{border:1px solid var(--line);background:#ffffffb8;border-radius:16px;width:100%}.mock-api-form input{padding:10px 12px}.mock-api-actions{flex-wrap:wrap;gap:8px;display:flex}.mock-api-output{max-height:220px;margin:0;padding:12px;overflow:auto}.assist-toggle{background:#ffffffa8;border-radius:18px;align-items:center;gap:10px;padding:12px;font-weight:800;display:flex}.assist-toggle input{width:18px;height:18px;accent-color:var(--peach-strong)}.eyebrow{letter-spacing:.12em;text-transform:uppercase;margin:0 0 6px;font-size:12px;font-weight:800;color:var(--peach-strong)!important}.module-list{gap:16px;display:grid}.sidebar-controls,.learning-route-map{border:1px solid var(--line);background:#ffffff9e;border-radius:22px;gap:10px;margin-bottom:14px;padding:14px;display:grid}.sidebar-controls label{color:#6b3941;gap:6px;font-size:12px;font-weight:900;display:grid}.sidebar-controls input,.sidebar-controls select{width:100%;color:var(--ink);background:#ffffffc7;border:1px solid #f05f7329;border-radius:14px;padding:9px 10px}.learning-route-map div{flex-wrap:wrap;gap:6px;display:flex}.route-node{color:#806d70;background:#ffe7e8b8;border-radius:999px;padding:4px 7px;font-size:11px;font-weight:900}.current-stage-highlight{box-shadow:0 14px 32px #f05f7324;border-color:#f05f735c!important}.route-node.current-stage-highlight{color:#fff;background:linear-gradient(135deg,#ff8d7a,#f05f73)}.module-card{border-radius:24px;padding:16px}.module-card h2{margin:0;font-size:16px}.module-toggle{width:100%;color:var(--ink);text-align:left;background:0 0;border:0;align-items:center;gap:8px;padding:0;display:flex}.module-toggle strong{font-size:16px}.empty-nav-note{font-size:12px;margin:0!important}.module-card p{margin:6px 0 14px;font-size:13px}.lesson-list{gap:8px;display:grid}.lesson-link{width:100%;color:var(--ink);text-align:left;background:#ffffff80;border:1px solid #0000;border-radius:18px;grid-template-columns:36px 1fr 28px;align-items:center;gap:10px;padding:10px;transition:transform .16s,border-color .16s,background .16s;display:grid}.lesson-link:hover,.lesson-link.is-active{background:#ffe7e8e0;border-color:#f05f7352;transform:translateY(-1px)}.lesson-index{color:#b67a7e;font-size:12px;font-weight:900}.lesson-link-main{gap:3px;display:grid}.lesson-link-main strong{font-size:14px}.lesson-link-main small{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px;display:flex}.track-chip{color:#6b3941;letter-spacing:.04em;background:#ffe7ec;border-radius:999px;align-items:center;width:max-content;padding:2px 7px;font-size:11px;font-weight:950;display:inline-flex}.track-setup{background:#fff0cf}.track-html{background:#ffe0d3}.track-css{background:#e0edff}.track-javascript{background:#fff4b8}.track-typescript{color:#21416b;background:#dcecff}.track-rust{color:#5a2d12;background:#ffe0c7}.track-math{color:#3f316f;background:#ebe1ff}.track-project{color:#1f5c49;background:#dff8ed}.track-testing{color:#4b2d7d;background:#efe1ff}.track-shipping{color:#61420b;background:#ffe8ad}.lesson-dot{border:1px solid var(--line);border-radius:999px;place-items:center;width:26px;height:26px;display:grid}.lesson-dot.is-done{color:#fff;background:linear-gradient(135deg,#35c48f,#12a873);border:none}.main-shell{min-width:0;padding:24px}.topbar{z-index:5;border-radius:24px;grid-template-columns:auto minmax(180px,1fr) auto;align-items:center;gap:18px;margin-bottom:22px;padding:16px;display:grid;position:sticky;top:16px}.progress-track{background:#806d7029;border-radius:999px;height:12px;overflow:hidden}.progress-track span{border-radius:inherit;background:linear-gradient(90deg,#ff9a8b,#f05f73,#8d5cf6);height:100%;display:block}.next-pill{color:#6b3941;background:#fff0f2;border-radius:999px;padding:10px 12px;font-size:13px;font-weight:800}.study-dashboard{grid-template-columns:minmax(0,1.1fr) minmax(260px,.75fr) minmax(300px,.95fr);gap:18px;margin-bottom:22px;display:grid}.dashboard-card h2{letter-spacing:-.03em;margin:0}.dashboard-card p{color:var(--muted);line-height:1.7}.today-card{background:linear-gradient(135deg,#ffffffd1,#fff0dfcc),radial-gradient(circle at 100% 0,#f05f7329,#0000 18rem)}.review-card{background:linear-gradient(135deg,#ffffffd1,#f6f0ffc2),radial-gradient(circle at 0 0,#8d5cf61f,#0000 16rem)}.independence-card{background:linear-gradient(135deg,#ffffffdb,#ebfaffbd),radial-gradient(circle at 100% 12%,#4db8ff2e,#0000 17rem)}.readiness-bar{background:#ffffffb8;border:1px solid #4db8ff33;border-radius:999px;height:12px;overflow:hidden}.readiness-bar span{border-radius:inherit;background:linear-gradient(90deg,#ff9a8b,#8d5cf6,#4db8ff);height:100%;display:block}.readiness-steps{gap:10px;margin:14px 0 0;padding:0;list-style:none;display:grid}.readiness-steps li{background:#ffffff94;border:1px solid #4db8ff29;border-radius:18px;padding:12px}.readiness-steps strong,.readiness-steps span{display:block}.readiness-steps span{color:#4f7185;margin-top:4px;font-size:12px;font-weight:850}.readiness-steps p{margin:8px 0 0;font-size:13px}.graduation-challenges{background:linear-gradient(135deg,#ffffffd6,#fff5dfb8),radial-gradient(circle at 96% 10%,#ff9a8b29,#0000 20rem);border-radius:30px;gap:18px;padding:26px;display:grid}.graduation-heading h2{letter-spacing:-.035em;margin:0}.graduation-heading p{max-width:900px;color:var(--muted);line-height:1.75}.challenge-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.challenge-card{background:#ffffffa3;border:1px solid #f05f7324;border-radius:24px;gap:12px;padding:18px;display:grid}.challenge-card.is-complete{background:#eefff7c7;border-color:#20b77f47}.challenge-title-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.challenge-title-row span{color:#315f4d;background:#20b77f1f;border-radius:999px;flex:none;padding:6px 10px;font-size:12px;font-weight:900}.challenge-field{gap:8px;display:grid}.challenge-field span,.challenge-complete span{color:#6b3941;font-size:13px;font-weight:900}.challenge-field textarea{resize:vertical;min-height:86px;color:var(--ink);background:#ffffffb8;border:1px solid #f05f7329;border-radius:16px;padding:12px}.challenge-field.compact textarea{min-height:72px}.challenge-stage-panels{background:#fff7f4a8;border:1px solid #f05f7329;border-radius:22px;gap:12px;padding:14px;display:grid}.challenge-stage-panels>p{color:var(--muted);margin:0;line-height:1.65}.challenge-stage-panel{background:#ffffffb3;border:1px solid #ff9a8b33;border-radius:18px;gap:10px;padding:12px;display:grid}.challenge-stage-panel h4,.challenge-stage-panel p{margin:0}.challenge-stage-panel h4{color:#7b3d47}.challenge-stage-panel p{color:var(--muted);line-height:1.6}.acceptance-list{gap:8px;list-style:none;display:grid;padding:0!important}.checkpoint-panel{background:#f0fff79e;border:1px solid #20b77f24;border-radius:20px;gap:10px;padding:14px;display:grid}.checkpoint-list{gap:8px;margin:0;list-style:none;display:grid;padding-left:0!important}.checkpoint-list label{align-items:flex-start;gap:10px;display:flex}.checkpoint-list input{accent-color:var(--peach-strong);margin-top:5px}.checkpoint-list b{color:#315f4d;display:block}.checkpoint-list span{color:var(--muted);line-height:1.55}.acceptance-list label,.challenge-complete{align-items:flex-start;gap:8px;display:flex}.acceptance-list input,.challenge-complete input{accent-color:var(--peach-strong);margin-top:4px}.challenge-review-panel{background:#faf7ff9e;border:1px solid #8d5cf61f;border-radius:20px;gap:10px;padding:14px;display:grid}.submission-checklist{gap:7px;padding-left:20px;display:grid}.rubric-grid{gap:8px;display:grid}.rubric-item{background:#ffffffa8;border:1px solid #4db8ff24;border-radius:16px;padding:10px 12px}.rubric-item h4,.rubric-item p,.challenge-review-panel blockquote,.challenge-review-panel blockquote p{margin:0}.rubric-item h4{color:#4a386d;font-size:13px}.challenge-review-panel blockquote{color:#6b3941;background:#fff6f2b8;border-left:4px solid #f05f7347;border-radius:14px;gap:6px;padding:12px;display:grid}.challenge-review-panel blockquote p{color:var(--muted);line-height:1.7}.portfolio-summary{background:#fff8f2b8;border:1px solid #f05f7324;border-radius:20px;gap:10px;padding:14px;display:grid}.portfolio-summary p{color:var(--muted);line-height:1.6}.portfolio-summary textarea{resize:vertical;color:#503036;background:#ffffffb8;border:1px solid #f05f7324;border-radius:16px;min-height:190px;padding:12px;font-family:ui-monospace,SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:12px;line-height:1.55}.summary-actions{flex-wrap:wrap;gap:10px;display:flex}.challenge-card h3,.challenge-card p{margin:0}.challenge-card p,.challenge-card li{color:var(--muted);line-height:1.65}.challenge-card strong,.challenge-card summary{color:#6b3941;font-weight:900}.challenge-card ul{margin:8px 0 0;padding-left:20px}.dashboard-actions{flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px;display:flex}.dashboard-actions span{color:#806d70;font-size:13px;font-weight:850}.review-card ul{gap:8px;margin:14px 0 0;padding:0;list-style:none;display:grid}.review-link{color:#3f316f;text-align:left;background:#ffffff9e;border:1px solid #8d5cf624;border-radius:16px;gap:4px;width:100%;padding:10px 12px;display:grid}.review-link span{color:#806d70;font-size:12px}.review-category-chip{background:#8d5cf61f;border-radius:999px;width:fit-content;padding:3px 8px;font-weight:900;color:#5d3a5f!important;font-size:11px!important}.review-category-chip.category-type{background:#4db8ff29;color:#254f73!important}.review-category-chip.category-boundary{background:#ffb9552e;color:#795026!important}.review-category-chip.category-naming{background:#20b77f24;color:#315f4d!important}.review-reminder{color:#9a5964;font-size:11px;font-style:normal;font-weight:850}.review-sprint{background:#fff7f4b8;border:1px dashed #f05f733d;border-radius:18px;gap:8px;margin-top:12px;padding:12px;display:grid}.review-sprint p,.review-sprint ol{margin:0}.review-sprint ol{gap:8px;padding-left:18px;display:grid}.lesson-panel{gap:20px;display:grid}.hero{border:1px solid var(--line);box-shadow:var(--shadow);background:linear-gradient(135deg,#ffffffd1,#ffeff4ad),radial-gradient(circle at 90% 0,#8d5cf629,#0000 22rem);border-radius:34px;justify-content:space-between;gap:20px;padding:30px;display:flex}.hero h2{font-size:clamp(32px,5vw,66px);line-height:.95}.hero p{max-width:860px;font-size:16px}.hero-actions,.practice-actions{flex-wrap:wrap;place-content:flex-start flex-end;gap:10px;display:flex}.prereq-box{background:#ffffff94;border:1px solid #f05f7329;border-radius:18px;flex-wrap:wrap;align-items:center;gap:10px;max-width:860px;margin-top:16px;padding:12px;display:flex}.prereq-box>span{color:var(--peach-strong);letter-spacing:.08em;font-size:12px;font-weight:950}.prereq-box strong{color:#5d3a40;font-size:13px}.prereq-list{flex-wrap:wrap;gap:8px;display:flex}.prereq-pill{color:#743b45;background:#fff0f3;border:0;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:850}.next-ideas{background:#fff5e8d1;border-radius:22px;margin-top:16px;padding:16px}.next-ideas ul,.next-ideas ol{color:#5d3a40;margin:0;padding-left:18px;line-height:1.7}.tutorial-block h4{margin:0 0 8px}.tutorial-block p,.mini-practice p{color:#6f555a;margin:0 0 10px;line-height:1.7}.extra-practice-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px;display:grid}.mini-practice{background:#ffffff94;border:1px solid #f05f7324;border-radius:16px;padding:12px}.mini-practice strong{color:#4c3036;margin-bottom:6px;display:block}.resource-links{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.resource-links a{color:#21416b;background:#dcecff;border-radius:999px;padding:8px 10px;font-size:13px;font-weight:850;text-decoration:none}.next-ideas details{margin-top:14px}.next-ideas summary{cursor:pointer;color:#743b45;font-weight:850}.lesson-learning-grid{grid-template-columns:minmax(230px,.55fr) minmax(320px,.95fr) minmax(0,1.2fr);align-items:stretch;gap:20px;display:grid}.lesson-learning-grid:has(.visual-card){grid-template-columns:minmax(220px,.48fr) minmax(300px,.78fr) minmax(240px,.62fr) minmax(0,1.05fr)}.concept-panel,.example-panel,.part-map-panel,.practice-workbench,.support-rail>.card,.support-rail>.feedback{scroll-margin-top:110px}.concept-panel{background:linear-gradient(135deg,#ffffffd6,#fff6e8c7),radial-gradient(circle at 100% 0,#ff9a8b21,#0000 18rem);gap:14px;display:grid}.concept-panel h3,.example-panel h3,.part-map-panel h3,.goals-card h3{letter-spacing:-.025em;margin:0}.concept-panel p,.example-panel p,.part-map-panel p,.grading-mode-note{color:var(--muted);line-height:1.7}.structure-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.structure-grid>div,.grading-mode-note{background:#ffffff9e;border:1px solid #f05f731f;border-radius:16px;padding:12px}.structure-grid strong{color:#743b45;font-size:13px;display:block}.structure-grid p{margin:6px 0 0;font-size:13px}.example-panel{background:linear-gradient(135deg,#ffffffd1,#f6f0ffad),radial-gradient(circle at 100% 0,#8d5cf61f,#0000 16rem);min-width:0}.part-map-panel{background:linear-gradient(135deg,#fafffaf5,#fff6eceb),radial-gradient(circle at 100% 0,#ffb86b24,#0000 18rem);gap:14px;display:grid}.part-map-list{gap:12px;display:grid}.part-card{background:#ffffffad;border:1px solid #ecb46642;border-radius:20px;grid-template-columns:auto minmax(0,1fr);gap:12px;padding:14px;display:grid}.part-number{color:#fff;background:linear-gradient(135deg,#ffb86b,#ff7aa2);border-radius:999px;place-items:center;width:32px;height:32px;font-weight:800;display:grid;box-shadow:0 10px 22px #ff7aa233}.part-card h4{color:#743b45;margin:0 0 6px}.part-card code{color:#8f3d55;margin:4px 0 8px;display:inline-block}.part-card dl{gap:6px;margin:10px 0;display:grid}.part-card dl>div{grid-template-columns:48px minmax(0,1fr);gap:8px;display:grid}.part-card dt{color:#8d5a2b;font-weight:800}.part-card dd{color:var(--muted);margin:0}.part-card pre{margin-top:10px}.part-checkpoint-flow{background:#fffafbc7;border:1px dashed #f05f7352;border-radius:24px;gap:12px;margin:18px 0;padding:16px;display:grid}.part-checkpoint-flow .section-title{align-items:flex-start}.part-checkpoint-flow .section-title span{color:var(--muted);font-weight:800}.part-checkpoint-card{background:#ffffffc7;border:1px solid #f05f732e;border-radius:20px;grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:14px;padding:14px;display:grid}.part-checkpoint-card.is-checked{background:linear-gradient(135deg,#f5fff8e6,#ffffffbd);border-color:#52a4695c}.part-mini-task,.part-reflection-prompt,.part-checkpoint-note{color:var(--muted);margin:8px 0 0}.part-starter-snippet{margin:12px 0 0}.part-self-check{white-space:nowrap}.practice-workbench{background:linear-gradient(135deg,#ffffffe0,#fff2f4b8),radial-gradient(circle at 100% 0,#f05f731a,#0000 20rem);border-color:#f05f7338}.feedback-panel{background:linear-gradient(135deg,#ffffffd6,#ebfaffad),radial-gradient(circle at 100% 0,#4db8ff1f,#0000 14rem)}.lesson-studio{gap:22px;display:grid}.content-grid,.practice-layout{grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr);gap:20px;display:grid}.content-grid:has(.visual-card){grid-template-columns:minmax(220px,.55fr) minmax(260px,.75fr) minmax(0,1.2fr)}.visual-card{background:linear-gradient(135deg,#fffc,#f6f0ffb8),radial-gradient(circle at 100% 0,#8d5cf624,#0000 16rem);min-width:0;overflow:hidden}.visual-card h3{margin:0 0 8px}.visual-card p{color:var(--muted);line-height:1.7}.visual-card>code{color:#3f316f;white-space:normal;background:#ffffffad;border-radius:14px;margin-top:12px;padding:10px 12px;display:block}.visual-grid{background-color:#ffffff85;background-image:linear-gradient(#8d5cf61f 1px,#0000 1px),linear-gradient(90deg,#8d5cf61f 1px,#0000 1px);background-size:28px 28px;border:1px solid #8d5cf62e;border-radius:22px;height:170px;margin:14px 0;position:relative;overflow:hidden}.axis,.distance-leg,.distance-line,.vector-arrow{border-radius:999px;display:block;position:absolute}.axis-x{background:#502f362e;height:2px;top:50%;left:16px;right:16px}.axis-y{background:#502f362e;width:2px;top:16px;bottom:16px;left:50%}.point{color:#fff;background:linear-gradient(135deg,#ff8d7a,#8d5cf6);border-radius:50%;place-items:center;width:30px;height:30px;font-size:12px;font-weight:950;display:grid;position:absolute;box-shadow:0 10px 24px #8d5cf640}.point-a{top:56%;left:32%}.point-b{top:32%;left:63%}.vector-arrow{transform-origin:0;background:#f05f73;width:92px;height:4px;top:calc(56% + 13px);left:calc(32% + 20px);transform:rotate(-28deg)}.vector-arrow:after{content:"";border-top:7px solid #0000;border-bottom:7px solid #0000;border-left:11px solid #f05f73;width:0;height:0;position:absolute;top:-5px;right:-2px}.distance-line{transform-origin:0;background:#8d5cf6;width:96px;height:3px;top:calc(56% + 13px);left:calc(32% + 20px);transform:rotate(-32deg)}.leg-x{border:1px dashed #f05f73;width:112px;height:2px;top:calc(56% + 42px);left:calc(32% + 15px)}.leg-y{border:1px dashed #f05f73;width:2px;height:72px;top:calc(32% + 18px);left:calc(63% + 15px)}.percent-visual{background:#806d7029;border-radius:999px;height:28px;margin:18px 0;overflow:hidden}.percent-visual span{border-radius:inherit;background:linear-gradient(90deg,#ff9a8b,#f05f73,#8d5cf6);height:100%;display:block}.project-visual{grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;margin:16px 0;display:grid}.project-visual div{color:#1f5c49;text-align:center;background:#dff8edc7;border:1px solid #1f5c4929;border-radius:20px;padding:18px 12px;font-weight:950}.project-visual span{color:#1f5c49;font-weight:950}.examples-card{min-width:0}.example-stack{gap:12px;margin-top:12px;display:grid}.example-stack details{background:#ffffff80;border:1px solid #502f361f;border-radius:18px;padding:12px}.example-stack summary{cursor:pointer;color:#743b45;font-weight:950}.example-stack p{color:var(--muted);line-height:1.7}.example-stack pre{margin-top:10px}.practice-layout{grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);align-items:start}.card,.feedback,.roadmap,.dashboard-card{border-radius:28px;padding:22px}.goals-card ul,.roadmap ol{color:#4a363a;margin:0;padding-left:20px;line-height:1.8}pre{color:#fff5ef;background:#25191b;border-radius:20px;margin:0;padding:18px;overflow:auto;box-shadow:inset 0 0 0 1px #ffffff14}code,.code-editor{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.section-title{justify-content:space-between;gap:18px;margin-bottom:14px;display:flex}.section-title h3{margin:0;font-size:19px;line-height:1.5}.code-editor,.notes-editor{resize:vertical;color:#2d2023;background:#ffffffc2;border:1px solid #502f3629;border-radius:22px;outline:none;width:100%;box-shadow:inset 0 2px 18px #7a41360f}.code-editor{tab-size:2;min-height:310px;padding:18px;font-size:14px;line-height:1.7}.notes-editor{min-height:160px;padding:14px;line-height:1.6}.code-editor:focus,.notes-editor:focus{border-color:#f05f739e;box-shadow:inset 0 2px 18px #7a41360f,0 0 0 4px #f05f731f}.practice-actions{justify-content:flex-start;margin-top:14px}.primary-button,.secondary-button,.ghost-button,.file-button{border:0;border-radius:999px;padding:11px 16px;font-weight:900;transition:transform .16s,box-shadow .16s,background .16s}.file-button{justify-content:center;align-items:center;display:inline-flex}.file-button input{opacity:0;pointer-events:none;width:1px;height:1px;position:absolute}.primary-button{color:#fff;background:linear-gradient(135deg,#ff8d7a,#f05f73 55%,#8d5cf6);box-shadow:0 14px 34px #f05f7347}.secondary-button,.ghost-button,.file-button{color:#743b45;background:#ffebeedb}.ghost-button.danger{color:#8b2f3b;background:#ffe5e5bd}.primary-button:hover,.secondary-button:hover,.ghost-button:hover,.file-button:hover{transform:translateY(-1px)}.support-rail{gap:16px;display:grid}.feedback.empty{border-style:dashed}.feedback.perfect{background:linear-gradient(135deg,#ecfff6db,#fffc)}.feedback-head{justify-content:space-between;align-items:center;gap:16px;display:flex}.feedback h3{margin:0}.score-ring{color:#3b252a;background:radial-gradient(circle at center, white 56%, transparent 57%), conic-gradient(#35c48f var(--score), #806d702e 0);border-radius:50%;place-items:center;width:64px;height:64px;font-weight:950;display:grid}.check-list{gap:10px;margin:16px 0 0;padding:0;list-style:none;display:grid}.check-list li{background:#ffffff8f;border-radius:18px;grid-template-columns:28px 1fr;align-items:start;gap:10px;padding:12px;display:grid}.check-list li>span{border-radius:50%;place-items:center;width:24px;height:24px;font-weight:900;display:grid}.check-list li.pass>span{color:#fff;background:#20b77f}.check-list li.fail>span{color:#9a4a54;background:#ffe0e5}.check-list strong,.check-list small{display:block}.check-list small{color:var(--muted);margin-top:2px;line-height:1.5}.feedback-ladder,.next-small-step,.solution-locked-note,.solution-unlock-note{background:#ffffff8f;border:1px solid #ff9bb338;border-radius:18px;margin-top:14px;padding:14px}.feedback-ladder h4,.feedback-ladder p,.next-small-step p{margin:4px 0 0}.feedback-ladder ol{gap:8px;margin:12px 0 8px;padding:0;list-style:none;display:grid}.feedback-ladder li{color:var(--muted);grid-template-columns:24px 1fr;align-items:center;gap:8px;display:grid}.feedback-ladder li span{background:#806d7024;border-radius:50%;place-items:center;width:22px;height:22px;font-size:.78rem;font-weight:900;display:grid}.feedback-ladder li.is-active{color:#4d3037;font-weight:800}.feedback-ladder li.is-active span{color:#fff;background:linear-gradient(135deg, var(--peach), var(--pink))}.next-small-step{background:#edfff79e;border-color:#35c48f3d}.next-small-step.perfect{border-color:#35c48f57}.solution-locked-note{color:#7b4a54;background:#fff4e6b8}.solution-unlock-note{color:#416452;background:#ebfff5b8}.solution-box{background:#ebfff5c7;border:1px solid #35c48f38;border-radius:22px;margin-top:16px;padding:14px}.roadmap{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:20px;margin-top:2px;display:grid}.roadmap code{background:#ffd9e0d1;border-radius:8px;padding:2px 6px}@media (width<=1120px){:is(.app-shell,.challenge-grid,.content-grid,.lesson-learning-grid,.lesson-learning-grid:has(.visual-card),.practice-layout,.roadmap,.study-dashboard,.topbar){grid-template-columns:1fr}.sidebar{height:auto;position:static}.hero{flex-direction:column}.hero-actions{justify-content:flex-start}}@media (width<=640px){.main-shell,.sidebar{padding:14px}.hero,.card,.feedback,.roadmap,.graduation-challenges,.dashboard-card,.topbar{border-radius:22px;padding:16px}.brand-card{align-items:flex-start}.extra-practice-grid,.structure-grid,.part-card,.part-card dl>div{grid-template-columns:1fr}.section-title,.feedback-head{flex-direction:column}}.welcome-page{gap:28px;width:min(1180px,100% - 32px);margin:0 auto;padding:32px 0 56px;display:grid}.welcome-hero{border:1px solid var(--line);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:radial-gradient(circle at 0 0,#ff9a8b3d,#0000 24rem),#ffffffbd;border-radius:34px;grid-template-columns:minmax(0,1fr) minmax(260px,360px);align-items:stretch;gap:24px;padding:34px;display:grid}.welcome-hero h1{letter-spacing:-.07em;max-width:760px;margin:0;font-size:clamp(36px,6vw,72px);line-height:.96}.welcome-hero p{color:var(--muted);line-height:1.8}.welcome-actions,.stage-continue-card,.lesson-stage-tabs,.welcome-module-grid{flex-wrap:wrap;gap:12px;display:flex}.welcome-progress-card{color:#fff;text-align:center;background:linear-gradient(135deg,#ff8d7a,#f05f73 58%,#8d5cf6);border-radius:30px;place-items:center;gap:10px;padding:24px;display:grid;box-shadow:0 24px 60px #f05f7347}.welcome-progress-card span{letter-spacing:-.08em;font-size:72px;font-weight:950}.welcome-progress-card p,.welcome-progress-card strong{margin:0}.welcome-course-picker{border:1px solid var(--line);box-shadow:var(--shadow);background:#ffffffb8;border-radius:30px;gap:18px;padding:24px;display:grid}.welcome-module-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));display:grid}.welcome-module-card{min-height:180px;color:inherit;text-align:left;background:#ffffffc7;border:1px solid #f05f7329;border-radius:24px;gap:10px;padding:18px;display:grid}.welcome-module-card:hover{border-color:#f05f7361;transform:translateY(-2px);box-shadow:0 16px 36px #f05f7321}.welcome-module-card p,.welcome-module-card small,.welcome-course-picker span{color:var(--muted);line-height:1.6}.side-menu-collapsed{grid-template-columns:116px minmax(0,1fr)}.sidebar.is-collapsed{padding:18px 12px}.sidebar.is-collapsed .brand-card{text-align:center;justify-items:center;display:grid}.sidebar.is-collapsed .brand-card p,.sidebar.is-collapsed .brand-card h1,.sidebar.is-collapsed .sidebar-expanded-content{display:none}.side-menu-toggle{margin-top:8px}.lesson-stage-shell{padding-top:28px}.lesson-stage-tabs{z-index:3;border:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffd1;border-radius:26px;padding:12px;position:sticky;top:0;box-shadow:0 14px 40px #7a41361f}.lesson-stage-tab{min-width:0;color:var(--ink);text-align:left;background:#fff7f1b8;border:1px solid #f05f7324;border-radius:20px;flex:180px;grid-template-columns:auto 1fr;align-items:center;gap:4px 10px;padding:14px;display:grid}.lesson-stage-tab span{color:#fff;background:linear-gradient(135deg,#ff8d7a,#f05f73);border-radius:999px;grid-row:span 2;place-items:center;width:32px;height:32px;font-weight:900;display:grid}.lesson-stage-tab small{color:var(--muted);line-height:1.35}.lesson-stage-tab.is-active{border-color:#f05f7373;box-shadow:0 12px 26px #f05f7329}.lesson-stage-tab.is-locked{opacity:.48;cursor:not-allowed}.lesson-stage-body{animation:.18s ease-out stageFade}.stage-continue-card{background:#fff7f1c7;border:1px dashed #f05f7359;border-radius:24px;justify-content:space-between;align-items:center;padding:18px}.stage-continue-card p{color:var(--muted);margin:6px 0 0;line-height:1.65}.inline-notes{margin-top:14px}@keyframes stageFade{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (width<=900px){.welcome-hero,.side-menu-collapsed,.app-shell{grid-template-columns:1fr}.sidebar,.sidebar.is-collapsed{height:auto;position:static}.sidebar.is-collapsed .sidebar-expanded-content,.sidebar.is-collapsed .brand-card p,.sidebar.is-collapsed .brand-card h1{display:block}}
