@layer components{.shell{max-width:var(--max);margin:auto;padding:0 24px}.btn{border:0;border-radius:13px;padding:11px 16px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn.primary{background:var(--primary);color:#fff}.btn.secondary{background:var(--card);border:1px solid var(--border)}.iconbtn{width:42px;height:42px;border-radius:13px;border:1px solid var(--border);background:var(--card);color:var(--foreground)}.badge{padding:5px 8px;background:var(--muted);color:var(--muted-foreground);font-size:11px}.badge,.eyebrow{display:inline-flex;border-radius:999px;font-weight:850}.eyebrow{align-items:center;gap:8px;background:var(--primarySoft);color:var(--primary);padding:7px 10px;font-size:12px;letter-spacing:.04em}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--rLG);box-shadow:var(--shadowSm)}.progress{height:8px;background:var(--surface3);border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--primary),var(--cyan))}.textbtn{border:0;background:transparent;color:var(--primaryStrong);font-weight:850;padding:0}.section{padding-block:42px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px}.section-head h2{font-size:26px;margin:0;letter-spacing:-.6px}.section-head p{color:var(--muted-foreground);font-size:13px;margin:4px 0 0}.public-header{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--background) 88%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}.public-nav{height:74px;justify-content:space-between;gap:20px}.brand,.public-nav{display:flex;align-items:center}.brand{gap:10px;font-size:20px;font-weight:850;letter-spacing:-.4px;border:0;background:transparent;color:inherit;padding:0}.mark{width:40px;height:40px;display:inline-grid;place-items:center;flex:none}.knowledge-mark{width:100%;height:100%;overflow:visible}.knowledge-mark-page,.knowledge-mark-step{fill:none;stroke-linecap:round}.knowledge-mark-step{stroke:var(--green);stroke-width:2.2}.knowledge-mark-left{fill:var(--green)}.knowledge-mark-right{fill:var(--primary)}.knowledge-mark-spine{fill:var(--foreground)}.knowledge-mark-page{stroke:var(--background);stroke-width:1.2;opacity:.72}.wordmark{display:inline-flex;align-items:center;gap:8px;flex:none}.brand-name{display:inline-flex;align-items:baseline;white-space:nowrap;font-family:var(--font-ui);font-size:21px;font-weight:800;line-height:1;letter-spacing:-.055em;color:var(--foreground)}.brand-name em{margin-left:2px;font-family:var(--font-editorial);font-size:24px;font-weight:650;font-style:italic;letter-spacing:-.04em;color:var(--brand-marker)}.brand-name small{margin-left:2px;font:700 8px/1 var(--font-code);letter-spacing:-.03em;color:var(--green)}.brand{flex:none}.brand-compact{display:none}@media (max-width:440px){.public-header .wordmark{display:none}.public-header .brand-compact{display:inline-grid}}.public-links{display:flex;gap:26px;color:var(--muted-foreground);font-size:14px;font-weight:700}.public-actions{display:flex;gap:10px;align-items:center}.guest-hero{padding-block:58px 38px;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(430px,.95fr);gap:50px;align-items:center}.guest-hero h1{font-size:62px;line-height:1.02;letter-spacing:-2.7px;margin:18px 0}.lead{font-size:18px;line-height:1.65;color:var(--muted-foreground);max-width:680px}.hero-actions{gap:10px;margin-top:24px}.hero-actions,.trust{display:flex;flex-wrap:wrap}.trust{gap:16px;color:var(--muted-foreground);font-size:13px;font-weight:700;margin-top:22px}.hero-visual{background:linear-gradient(145deg,var(--card),var(--muted));border:1px solid var(--border);border-radius:30px;padding:20px;box-shadow:var(--shadow)}.choose-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}.choice{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:18px;text-align:left}.choice h3{font-size:17px;margin:10px 0 6px}.choice p{font-size:12.5px;color:var(--muted-foreground);margin:0}.choice-icon{width:42px;height:42px;border-radius:13px;background:var(--primarySoft);color:var(--primary);display:grid;place-items:center;font-weight:900}.choice.cs .choice-icon{background:var(--cyanSoft);color:var(--cyan)}.flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.flow-card{padding:20px}.flow-no{width:34px;height:34px;border-radius:11px;background:var(--primarySoft);color:var(--primary);display:grid;place-items:center;font-weight:900;margin-bottom:14px}.flow-card p{font-size:12.5px;color:var(--muted-foreground);margin:0}.class-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:12px}.class-card{border:1px solid var(--border);background:var(--card);border-radius:18px;padding:22px 12px;text-align:center;box-shadow:var(--shadowSm)}.class-card strong{display:block;font-size:28px;color:var(--primary)}.class-card span{font-size:12px;color:var(--muted-foreground)}.browse-layout{display:grid;grid-template-columns:250px 1fr;gap:22px;padding-block:34px 70px}.filters{background:var(--card);border:1px solid var(--border);border-radius:20px;padding:14px;height:max-content;position:sticky;top:95px}.filter-btn{width:100%;border:0;background:transparent;color:var(--muted-foreground);text-align:left;padding:10px 11px;border-radius:10px;font-weight:750}.filter-btn.active,.filter-btn:hover{background:var(--primarySoft);color:var(--primary)}.content-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.content-card{padding:18px;display:flex;flex-direction:column;min-height:185px}.content-card h3{font-size:16px;margin-bottom:5px}.content-card p{font-size:13px;color:var(--muted-foreground)}.content-meta{display:flex;justify-content:space-between;align-items:center;margin-top:auto;color:var(--muted-foreground);font-size:12px}.iconbox{width:42px;height:42px;border-radius:13px;background:var(--primarySoft);color:var(--primary);display:grid;place-items:center;font-weight:900;margin-bottom:16px}.topic-hero{padding-block:42px 22px}.breadcrumb{color:var(--muted-foreground);font-size:13px;margin-bottom:16px}.topic-box{background:linear-gradient(135deg,#5557d7,#726ce7);color:#fff;border-radius:26px;padding:30px;display:flex;justify-content:space-between;gap:24px;align-items:end}.topic-box h1{font-size:40px;margin:8px 0}.topic-box p{color:rgba(255,255,255,.84);max-width:680px}.topic-box .eyebrow{background:rgba(255,255,255,.14);color:#fff}.topic-box .btn{background:#fff;color:#4747b8}.resource-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;padding-block:22px 70px}.resource-list{display:grid;gap:12px}.resource{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:17px;display:grid;grid-template-columns:44px 1fr auto;gap:14px;align-items:center}.resico{width:44px;height:44px;border-radius:13px;background:var(--muted);display:grid;place-items:center;font-weight:900}.resource small{color:var(--muted-foreground)}.sidebox{padding:20px;height:max-content}.sidebox p{color:var(--muted-foreground);font-size:13px}.sidebox .btn{width:100%;margin-top:8px}.article-wrap{max-width:900px;margin:auto;padding-block:36px 70px}.article{padding:34px}.article h1{font-size:36px}.article h2{font-size:23px;margin-top:28px}.article p{font-size:16px;line-height:1.75;color:color-mix(in srgb,var(--foreground) 88%,var(--muted-foreground))}.formula{font-family:Georgia,Times New Roman,serif;background:var(--muted);border:1px solid var(--border);padding:20px;border-radius:14px;text-align:center;font-size:22px;margin:20px 0}.callout{margin-top:20px;background:var(--primarySoft);border-left:4px solid var(--primary);padding:15px 16px;border-radius:0 14px 14px 0}.callout p{margin:4px 0 0;color:var(--muted-foreground);font-size:13px}.cs-hero{padding-block:48px 34px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(420px,.9fr);gap:34px;align-items:center}.cs-hero h1{font-size:52px;line-height:1.04;letter-spacing:-2px;margin:16px 0}.cs-hero .eyebrow{background:var(--cyanSoft);color:var(--cyan)}.code-window{background:#0d1117;border-radius:18px;overflow:hidden;color:#e6edf3;box-shadow:0 14px 34px rgba(0,0,0,.18)}.code-top{height:42px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;background:#151b23;color:#8b949e;font-size:12px}.dots{display:flex;gap:6px}.dots span{width:9px;height:9px;border-radius:50%;background:#30363d}pre{margin:0;padding:18px;overflow:auto;font:13px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap}.testline{padding:12px 14px;border-top:1px solid #21262d;background:#11161d;color:#8b949e;font-size:12px}.testline strong{color:#3fb950}.path-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.path-card{padding:18px}.path-card h3{font-size:16px;margin-bottom:6px}.path-card p{font-size:12.5px;min-height:38px}.meta,.path-card p{color:var(--muted-foreground)}.meta{display:flex;justify-content:space-between;font-size:11px;margin-top:12px}.app-shell{display:grid;grid-template-columns:var(--sidebarW) 1fr;max-width:var(--max);margin:auto;min-height:100vh}.app-sidebar{position:sticky;top:0;height:100vh;border-right:1px solid var(--border);padding:26px 18px;background:color-mix(in srgb,var(--card) 94%,transparent);backdrop-filter:blur(16px);gap:24px;z-index:40}.app-sidebar,.side-nav{display:flex;flex-direction:column}.side-nav{gap:7px}.side-label{padding:10px 12px 5px;font-size:10px;font-weight:850;letter-spacing:.08em}.nav-btn,.side-label{color:var(--muted-foreground)}.nav-btn{border:0;background:transparent;display:flex;align-items:center;gap:11px;padding:11px 12px;border-radius:12px;font-weight:750;text-align:left}.nav-btn.active,.nav-btn:hover{background:var(--primarySoft);color:var(--primaryStrong)}.app-main{min-width:0;padding:25px 28px 90px}.app-top{justify-content:space-between;gap:16px;margin-bottom:24px}.app-top,.top-actions{display:flex;align-items:center}.top-actions{gap:10px}.avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#ffd48a,#f2a066);display:grid;place-items:center;font-weight:850}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,.8fr);gap:20px}.welcome{background:linear-gradient(135deg,#5557d7,#6e67e8 70%,#827bf1);color:#fff;border-radius:24px;padding:28px;min-height:250px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 18px 45px rgba(69,69,172,.24)}.welcome h1{font-size:34px;line-height:1.1;letter-spacing:-1.2px;margin:10px 0}.welcome p{color:rgba(255,255,255,.85);max-width:620px}.welcome .btn.primary{background:#fff;color:#4747b8}.welcome .btn.secondary{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);color:#fff}.metric-stack{display:grid;gap:12px}.metric{padding:17px}.metric-label{color:var(--muted-foreground);font-size:12px;font-weight:750}.metric-value{font-size:26px;font-weight:900;margin:4px 0}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.course{padding:18px;display:flex;flex-direction:column;min-height:185px}.course-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.subject-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;font-weight:900}.math{background:#eeeaff;color:#5a50c8}.science{background:#e3f7f1;color:#168562}.coding{background:var(--cyanSoft);color:var(--cyan)}.course h3{font-size:16px;margin:14px 0 4px}.course p{font-size:13px}.course p,.course-foot{color:var(--muted-foreground)}.course-foot{display:flex;justify-content:space-between;margin-top:auto;font-size:12px}.revise-list{display:grid;gap:10px}.revise-row{display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:12px;align-items:center;padding:14px}.donut{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--danger) var(--p),var(--surface3) 0);position:relative}.donut:after{content:"";position:absolute;inset:5px;border-radius:50%;background:var(--card)}.donut span{z-index:1;font-size:10px;font-weight:900}.focus-wrap{max-width:900px;margin:auto}.focus-header{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:16px}.question-card{padding:26px}.question-card h2{font-size:25px;line-height:1.35;margin:12px 0 22px}.answers{display:grid;gap:10px}.answer{width:100%;border:1px solid var(--border);background:var(--card);color:var(--foreground);padding:14px 15px;border-radius:14px;text-align:left;font-weight:700;display:flex;gap:12px;align-items:center}.answer.selected,.answer:hover{border-color:var(--primary);background:var(--primarySoft)}.answer.correct{border-color:var(--green);background:var(--greenSoft)}.answer.wrong{border-color:var(--danger);background:var(--dangerSoft)}.key{width:28px;height:28px;border-radius:9px;background:var(--muted);display:grid;place-items:center;font-size:12px}.feedback{margin-top:17px;background:var(--muted);border:1px solid var(--border);border-radius:14px;padding:16px;display:none}.feedback.show{display:block}.test-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px}.palette{padding:18px;height:max-content;position:sticky;top:20px}.nums{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.num{aspect-ratio:1;border:1px solid var(--border);border-radius:10px;background:var(--muted);color:var(--foreground);font-weight:800}.num.done{background:var(--greenSoft);border-color:var(--green)}.num.flag{background:var(--warnSoft);border-color:var(--warn)}.num.current{background:var(--primary);color:#fff;border-color:var(--primary)}.result-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:18px}.score-card{padding:28px;text-align:center;background:linear-gradient(145deg,var(--primarySoft),var(--card))}.score{font-size:58px;font-weight:900;color:var(--primaryStrong)}.breakdown{display:grid;gap:12px}.barrow{display:grid;grid-template-columns:140px 1fr 45px;gap:10px;align-items:center;font-size:13px}.bar{height:10px;background:var(--surface3);border-radius:999px;overflow:hidden}.bar span{display:block;height:100%;background:var(--primary);border-radius:inherit}.lab{display:grid;grid-template-columns:250px minmax(0,1fr);gap:18px}.lab-side{padding:14px;height:max-content}.topic-btn{width:100%;border:0;background:transparent;color:var(--muted-foreground);padding:10px 11px;text-align:left;border-radius:10px;font-weight:750;display:flex;justify-content:space-between}.topic-btn.active,.topic-btn:hover{background:var(--primarySoft);color:var(--primary)}.tabs{display:flex;gap:8px;margin-bottom:14px;overflow:auto}.tab{border:1px solid var(--border);background:var(--card);color:var(--muted-foreground);padding:10px 13px;border-radius:12px;font-weight:800;white-space:nowrap}.tab.active{background:var(--primarySoft);color:var(--primary)}.lab-panel{display:none}.lab-panel.active{display:block}.lesson-card,.practice-card{padding:24px}.lesson-card h2{font-size:30px}.lesson-card>p{color:var(--muted-foreground)}.steps{display:grid;gap:10px;margin-top:18px}.step{display:grid;grid-template-columns:32px 1fr;gap:12px}.stepno{width:32px;height:32px;border-radius:10px;background:var(--primarySoft);color:var(--primary);display:grid;place-items:center;font-weight:900;font-size:12px}.step p{margin:4px 0 0;color:var(--muted-foreground);font-size:13px}.visualizer{margin-top:20px;border:1px solid var(--border);background:var(--muted);border-radius:18px;padding:18px}.visual-head{display:flex;justify-content:space-between;gap:12px;align-items:center}.array{gap:12px;min-height:160px}.array,.cell{display:flex;align-items:end;justify-content:center}.cell{width:60px;border-radius:13px 13px 7px 7px;background:linear-gradient(180deg,var(--primary2),var(--primary));color:#fff;font-weight:900;padding-bottom:10px;position:relative}.cell:after{content:attr(data-i);position:absolute;bottom:-24px;color:var(--muted-foreground);font-size:11px}.practice-shell{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);gap:18px}.problem li,.problem p{color:var(--muted-foreground)}.example{background:var(--muted);border:1px solid var(--border);border-radius:14px;padding:14px;margin:16px 0;font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace}.editor{background:#0d1117;color:#e6edf3;border-radius:18px;overflow:hidden}.editorbar{height:44px;background:#151b23;display:flex;align-items:center;justify-content:space-between;padding:0 12px}.editorbar select{background:#0d1117;color:#c9d1d9;border:1px solid #30363d;border-radius:8px;padding:6px 8px}textarea{width:100%;min-height:330px;resize:vertical;border:0;outline:0;background:#0d1117;color:#e6edf3;padding:16px;font:13px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace}.editor-actions{padding:12px;display:flex;justify-content:space-between;gap:10px;background:#11161d;border-top:1px solid #21262d}.code-result{margin-top:12px;border:1px solid var(--border);background:var(--greenSoft);border-radius:14px;padding:14px;display:none}.code-result.show{display:block}.code-result strong{color:var(--green)}.skill-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.skill-card{padding:18px}.skill-card h3{font-size:16px}.skillrow{display:grid;grid-template-columns:130px 1fr 44px;gap:10px;align-items:center;margin:12px 0;font-size:12px}.modal-backdrop{position:fixed;inset:0;background:rgba(10,15,25,.48);display:none;align-items:center;justify-content:center;padding:20px;z-index:100}.modal-backdrop.show{display:flex}.modal{width:min(460px,100%);background:var(--card);border:1px solid var(--border);border-radius:24px;padding:24px;box-shadow:var(--shadow)}.modal h2{font-size:26px}.modal p{color:var(--muted-foreground)}.field{display:grid;gap:6px;margin:14px 0}.field label{font-size:12px;font-weight:800;color:var(--muted-foreground)}.field input,.field select{width:100%;border:1px solid var(--border);background:var(--card);color:var(--foreground);border-radius:12px;padding:11px 12px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}.mobile-app-nav{display:none}@media(max-width:1050px){.cs-hero,.guest-hero{grid-template-columns:1fr}.flow-grid,.path-grid{grid-template-columns:1fr 1fr}.class-grid{grid-template-columns:repeat(4,1fr)}.browse-layout{grid-template-columns:1fr}.filters{position:static;display:flex;overflow:auto;gap:8px}.filter-btn{width:auto;white-space:nowrap}.content-grid{grid-template-columns:1fr 1fr}.dashboard-grid,.resource-grid{grid-template-columns:1fr}.metric-stack{grid-template-columns:repeat(3,1fr)}.course-grid{grid-template-columns:1fr 1fr}.practice-shell,.result-grid,.test-layout{grid-template-columns:1fr}.palette{position:static}.lab{grid-template-columns:1fr}.lab-side{display:flex;gap:8px;overflow:auto}.topic-btn{width:auto;white-space:nowrap}}@layer components{.student-learn-hub{max-width:1050px;margin-inline:auto;padding-bottom:48px}.student-learning-directory{display:grid;margin-top:26px;border-top:1px solid var(--border)}.student-learning-directory>a{display:grid;grid-template-columns:54px minmax(0,1fr) auto;gap:18px;align-items:center;min-height:150px;padding:26px 4px;border-bottom:1px solid var(--border);color:inherit}.student-learning-directory>a:hover{background:color-mix(in srgb,var(--primarySoft) 32%,transparent)}.student-learning-directory h2{margin:5px 0 6px;font-size:22px}.student-learning-directory div>p:last-child{margin:0;color:var(--muted-foreground);font-size:14px}.student-learning-icon{display:grid;place-items:center;width:50px;height:50px;border-radius:12px;background:var(--primarySoft);color:var(--primaryStrong)}.student-learning-icon.is-code{background:var(--cyanSoft);color:var(--cyan)}.student-learning-icon svg{width:23px;height:23px}.study-setup>div.grid>div.space-y-6>section{padding:24px 0!important;border-width:1px 0 0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.study-setup>div.grid>aside>div{padding:22px 0!important;border-width:2px 0 0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.study-setup [role=radiogroup]{border-radius:9px}.study-setup [role=radio]{border-radius:7px}.study-setup [data-testid=resume-session-banner]{border-width:1px 0;border-radius:0;background:color-mix(in srgb,var(--primarySoft) 42%,transparent)}@media(max-width:700px){.student-learning-directory>a{grid-template-columns:46px minmax(0,1fr);align-items:start}.student-learning-directory .study-row-action{grid-column:2;justify-content:flex-start}.student-learning-icon{width:44px;height:44px}}}@layer components{.study-library .tp-page-header{border-bottom:1px solid var(--border);margin-bottom:18px}.study-library .tp-page-header h1{font-size:clamp(30px,4vw,44px);letter-spacing:-.04em}.study-library-filters input,.study-library-filters select,.video-mobile-filters select{box-shadow:none!important;background:var(--surface)}.video-mobile-filters{display:none}.study-filter-summary{margin:-18px 0 22px;color:var(--muted-foreground);font-size:13px;font-weight:700}.study-resource-empty{max-width:940px;padding:34px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.study-resource-empty h2{margin:6px 0 8px;font-size:28px;letter-spacing:-.03em}.study-resource-empty>p:not(.study-kicker){max-width:660px;color:var(--muted-foreground);line-height:1.6}.study-resource-alternatives{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:24px;border-block:1px solid var(--border)}.study-resource-alternatives a{display:flex;align-items:center;gap:12px;min-height:92px;padding:16px;border-right:1px solid var(--border);color:var(--foreground)}.study-resource-alternatives a:last-child{border-right:0}.study-resource-alternatives a:hover{background:var(--primarySoft)}.study-resource-alternatives svg{width:22px;height:22px;color:var(--primaryStrong);flex:none}.study-resource-alternatives small,.study-resource-alternatives strong{display:block}.study-resource-alternatives small{margin-top:3px;color:var(--muted-foreground);font-size:13px}.study-video-card{display:block;padding-bottom:12px}.study-video-card>div:first-child{border-radius:10px}.study-video-card>div:last-child{padding-inline:2px!important}.study-video-card h2{font-family:var(--font-heading)}.study-paper-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--border)}.study-paper-list li{padding-inline:4px!important;background:transparent!important}.study-paper-list button{box-shadow:none!important}.apt-study-hero,.cs-study-hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(420px,.82fr);align-items:center;gap:68px;padding-block:68px 58px;border-bottom:1px solid var(--border)}.apt-study-copy h1,.cs-study-copy h1{max-width:700px;margin:10px 0 18px;font-size:clamp(44px,5vw,66px);line-height:1.02;letter-spacing:-.055em}.apt-study-copy .lead,.cs-study-copy .lead{max-width:660px;color:var(--muted-foreground);font-size:18px;line-height:1.65}.apt-worked-example{padding-left:28px;border-left:2px solid color-mix(in srgb,var(--green) 36%,var(--border))}.apt-sample{padding:0!important;background:transparent!important;border:0!important;box-shadow:none!important}.apt-options li{border-radius:8px}.cs-code-preview .code-window{box-shadow:0 18px 44px rgba(17,24,39,.14)}.study-section-directory{display:grid;grid-template-columns:1fr 1fr;gap:0 34px;border-top:1px solid var(--border)}.study-section-directory>a{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:128px;padding:22px 0;border-bottom:1px solid var(--border);color:inherit}.study-section-directory>a:hover h3{color:var(--primaryStrong)}.study-section-directory h3{margin:0 0 5px;font-size:18px}.study-section-directory p{margin:0;color:var(--muted-foreground);font-size:14px;line-height:1.5}.study-section-directory>a>span{display:flex;align-items:center;gap:7px;color:var(--primaryStrong);font-size:13px;font-weight:800;white-space:nowrap}.study-section-directory svg{width:16px;height:16px}.study-guide-list,.study-path-list{display:grid;grid-template-columns:1fr 1fr;gap:0 36px;border-top:1px solid var(--border)}.study-guide-list>a,.study-path-list>a{display:grid;grid-template-columns:34px minmax(0,1fr) 20px;gap:12px;align-items:start;min-height:152px;padding:24px 0;border-bottom:1px solid var(--border);color:inherit}.study-guide-list>a>svg:first-child,.study-path-list>a>svg:first-child{width:22px;height:22px;color:var(--primaryStrong)}.study-guide-list>a>svg:last-child,.study-path-list>a>svg:last-child{width:18px;height:18px;color:var(--primaryStrong);transition:transform .15s}.study-guide-list>a:hover>svg:last-child,.study-path-list>a:hover>svg:last-child{transform:translateX(3px)}.study-guide-list h3,.study-path-list h3{margin:0 0 6px;font-size:17px}.study-guide-list p,.study-path-list p{margin:0 0 10px;color:var(--muted-foreground);font-size:14px;line-height:1.5}.study-guide-list span,.study-path-list span{color:var(--muted-foreground);font-size:13px}.study-path-list .progress{margin-top:10px}.practice-mobile-switch{display:none}@media(max-width:1050px){.apt-study-hero,.cs-study-hero{grid-template-columns:1fr;gap:38px;padding-block:48px}.apt-worked-example{max-width:720px}.study-resource-alternatives{grid-template-columns:1fr}.study-resource-alternatives a{border-right:0;border-bottom:1px solid var(--border)}.study-resource-alternatives a:last-child{border-bottom:0}}@media(max-width:700px){.video-chip-filters{display:none}.video-mobile-filters{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:24px}.video-mobile-filters label{display:grid;gap:5px;color:var(--muted-foreground);font-size:13px;font-weight:750}.video-mobile-filters label:last-child{grid-column:1/-1}.video-mobile-filters select{width:100%;min-height:44px;border:1px solid var(--border);border-radius:9px;padding:0 10px;color:var(--foreground)}.study-filter-summary{margin-top:-10px}.apt-study-hero,.cs-study-hero{padding-block:36px;gap:30px}.apt-study-copy h1,.cs-study-copy h1{font-size:42px}.apt-study-copy .lead,.cs-study-copy .lead{font-size:16px}.apt-worked-example{padding:22px 0 0;border-left:0;border-top:2px solid color-mix(in srgb,var(--green) 36%,var(--border))}.study-guide-list,.study-path-list,.study-section-directory{grid-template-columns:1fr}.study-section-directory>a{min-height:112px}.study-guide-list>a,.study-path-list>a{min-height:132px}.study-paper-list li{align-items:flex-start!important;gap:10px!important;padding-block:16px!important}.study-paper-list li button{width:44px;padding:0!important;justify-content:center}.study-paper-list li button svg{width:18px;height:18px}}@media(max-width:620px){.practice-mobile-switch{position:sticky;top:66px;z-index:45;display:grid;grid-template-columns:repeat(3,1fr);margin:0 0 18px;padding:4px;background:color-mix(in srgb,var(--background) 96%,transparent);border:1px solid var(--border);border-radius:10px;backdrop-filter:blur(12px)}.practice-mobile-switch button{min-height:40px;border:0;border-radius:7px;background:transparent;color:var(--muted-foreground);font-size:13px;font-weight:800}.practice-mobile-switch button[aria-selected=true]{background:var(--card);color:var(--primaryStrong);box-shadow:0 1px 6px rgba(39,54,87,.08)}.practice-mobile-switch button:disabled{opacity:.4;cursor:not-allowed}.practice-shell[data-mobile-pane=code] .code-result,.practice-shell[data-mobile-pane=code] .notice,.practice-shell[data-mobile-pane=code] .practice-card,.practice-shell[data-mobile-pane=problem] .code-workspace,.practice-shell[data-mobile-pane=result] .editor,.practice-shell[data-mobile-pane=result] .practice-card{display:none}.practice-shell[data-mobile-pane=result] .code-workspace{min-height:240px}.practice-shell[data-mobile-pane=result] .code-result{margin-top:0}.practice-shell{display:block}.practice-card{max-height:none!important}.code-workspace{width:100%}.editor .cm-editor{min-height:520px}.editorbar{position:relative;z-index:2}.lab-practice .tabs{margin-bottom:14px}}}.tp-section-head{align-items:flex-end;margin:0 0 28px;padding:0 0 22px 20px;border-bottom:1px solid color-mix(in srgb,var(--primary) 20%,var(--border))}.tp-section-head:before{content:"";position:absolute;left:0;top:3px;bottom:23px;width:3px;border-radius:99px;background:linear-gradient(to bottom,var(--primaryStrong) 0 70%,var(--home-pencil) 70% 100%)}.tp-section-head:after{display:none}.tp-section-head-copy{max-width:820px}.tp-section-eyebrow{margin:0 0 8px!important;color:var(--brand-marker)!important;font-size:12px!important;font-weight:850!important;letter-spacing:.11em;line-height:1.2;text-transform:uppercase}.tp-section-head h1,.tp-section-head h2{margin:0!important;font-size:clamp(30px,3vw,40px)!important;font-weight:800!important;line-height:1.08!important;letter-spacing:-.045em!important;color:var(--foreground)}.tp-section-description{max-width:760px;margin:9px 0 0!important;color:var(--muted-foreground)!important;font-size:15px!important;line-height:1.6!important}.tp-section-actions{display:flex;flex-wrap:wrap;gap:10px;padding-bottom:2px}.study-section-directory>a{display:grid;grid-template-columns:42px minmax(0,1fr) auto;justify-content:normal}.apt-directory-number{align-self:start;padding-top:3px;color:color-mix(in srgb,var(--primaryStrong) 72%,var(--muted-foreground));font:800 12px/1 var(--font-heading);letter-spacing:.06em;font-variant-numeric:tabular-nums}.study-section-directory h3{margin:0 0 7px;font-size:17px;font-weight:750;line-height:1.3;letter-spacing:-.015em}.apt-section{padding-top:68px}.apt-topic h3{font-size:16px;line-height:1.35}.btn{position:relative;min-height:42px;padding:0 16px;border:1px solid transparent;border-radius:8px;box-shadow:none;font-size:14px;font-weight:750;letter-spacing:-.01em;line-height:1.2;transition:transform .15s ease,background-color .15s ease,border-color .15s ease,color .15s ease}.btn.primary{background:var(--primaryStrong);border-color:var(--primaryStrong);color:var(--primary-foreground)}.btn.primary:before{content:"";width:3px;height:17px;margin-right:2px;border-radius:99px;background:var(--home-pencil)}.btn.secondary{background:transparent;border-color:color-mix(in srgb,var(--foreground) 20%,var(--border));color:var(--foreground)}.btn.ghost{background:transparent;border-color:transparent;color:var(--muted-foreground)}.btn.primary:hover:not(:disabled){background:var(--primary);border-color:var(--primary);transform:translateY(-1px)}.btn.secondary:hover:not(:disabled){background:color-mix(in srgb,var(--muted) 72%,transparent);border-color:color-mix(in srgb,var(--foreground) 34%,var(--border));transform:translateY(-1px)}.btn.ghost:hover:not(:disabled){background:var(--muted);color:var(--foreground)}.btn:active:not(:disabled){transform:translateY(0)!important}.btn.sm{min-height:34px;padding:0 11px;border-radius:7px;font-size:13px}.public-actions .btn{min-height:40px}.topic-box .btn.primary,.welcome .btn.primary{background:var(--primaryStrong)!important;border-color:var(--primaryStrong)!important;color:var(--primary-foreground)!important}.dark .btn.primary{background:var(--primary);border-color:var(--primary);color:var(--primary-foreground)}@media(max-width:760px){.tp-section-head{align-items:flex-start;flex-direction:column;padding:0 0 20px 16px}.tp-section-head:before{bottom:21px}.tp-section-head h1,.tp-section-head h2{font-size:30px!important}.tp-section-actions{width:100%;padding-top:4px}.tp-section-actions .btn{width:100%}.study-section-directory>a{grid-template-columns:34px minmax(0,1fr);min-height:0;padding:22px 0}.study-section-directory>a>span:last-child{grid-column:2;justify-self:start;margin-top:12px}.apt-section{padding-top:52px}}@media(max-width:820px){.shell{padding:0 16px}.public-actions .secondary,.public-links{display:none}.guest-hero h1{font-size:44px;letter-spacing:-1.6px}.choose-grid{grid-template-columns:1fr}.app-shell{display:block}.app-sidebar{display:none}.app-main{padding:18px 16px 88px}.mobile-app-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:10px;right:10px;bottom:10px;background:color-mix(in srgb,var(--card) 95%,transparent);backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:18px;padding:8px;z-index:70;box-shadow:var(--shadow)}.mobile-app-nav button{border:0;background:transparent;color:var(--muted-foreground);padding:7px 3px;border-radius:10px;font-size:10px}.mobile-app-nav button.active{background:var(--primarySoft);color:var(--primaryStrong)}}@media(max-width:620px){.content-grid,.course-grid,.flow-grid,.path-grid,.skill-grid{grid-template-columns:1fr}.class-grid{grid-template-columns:repeat(2,1fr)}.metric-stack{grid-template-columns:1fr 1fr}.metric-stack .metric:last-child{grid-column:1/-1}.topic-box{align-items:flex-start;flex-direction:column}.topic-box h1{font-size:32px}.resource{grid-template-columns:42px 1fr}.resource .btn{grid-column:2;justify-self:start}.article{padding:22px 18px 22px 38px}.article:before{left:17px}.article h1{font-size:29px}.question-card{padding:20px 16px}.question-card h2{font-size:21px}.array{gap:7px}.cell{width:44px}.barrow{grid-template-columns:100px 1fr 40px}.skillrow{grid-template-columns:100px 1fr 38px}.revise-row{grid-template-columns:40px 1fr}.revise-row .btn{grid-column:2;justify-self:start}}}@layer components{@keyframes fade{0%{opacity:.45;transform:translateY(4px)}to{opacity:1;transform:none}}.view-in{animation:fade .18s ease}.btn{transition:background .15s,border-color .15s,opacity .15s;white-space:nowrap}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.primary:hover:not(:disabled){background:var(--primaryStrong)}.btn.secondary:hover:not(:disabled){background:var(--muted)}.btn.sm{padding:8px 12px;border-radius:11px;font-size:13px}.answer:focus-visible,.btn:focus-visible,.choice:focus-visible,.class-card:focus-visible,.iconbtn:focus-visible,.nav-btn:focus-visible,.tab:focus-visible,.textbtn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.iconbtn{display:inline-grid;place-items:center}.public-links a,.public-links button{color:var(--muted-foreground);background:transparent;border:0;font-weight:700;padding:0}.public-links .active,.public-links a:hover,.public-links button:hover{color:var(--foreground)}.choice,.class-card{transition:border-color .15s,transform .15s,box-shadow .15s;color:inherit;display:block}.choice:hover,.class-card:hover{border-color:var(--primary);transform:translateY(-1px)}.card.hover{transition:border-color .15s,box-shadow .15s}.card.hover:hover{border-color:color-mix(in srgb,var(--primary) 45%,var(--border));box-shadow:var(--shadow)}.mobile-app-nav a{display:grid;justify-items:center;gap:2px;color:var(--muted-foreground);padding:7px 3px;border-radius:10px;font-size:10px;font-weight:700}.mobile-app-nav a.active{background:var(--primarySoft);color:var(--primaryStrong)}.mobile-app-nav svg,.side-nav .nav-btn svg{width:18px;height:18px}.subject-icon.lang{background:var(--orangeSoft);color:var(--orange)}.subject-icon.social{background:var(--warnSoft);color:var(--warn)}.subject-icon.other{background:var(--muted);color:var(--muted-foreground)}.lab-side a.topic-btn{display:flex}.topic-btn .tick{color:var(--green)}.empty{border:1px dashed var(--border);border-radius:var(--rLG);padding:36px 20px;text-align:center;color:var(--muted-foreground);background:var(--card)}.empty h3{color:var(--foreground);margin:0 0 6px}.skeleton{background:linear-gradient(90deg,var(--muted),var(--surface3),var(--muted));background-size:200% 100%;animation:shimmer 1.2s linear infinite;border-radius:var(--rMD)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.notice{border-radius:var(--rMD);padding:12px 14px;font-size:13px;font-weight:650;border:1px solid}.notice.error{background:var(--dangerSoft);border-color:color-mix(in srgb,var(--danger) 40%,transparent);color:var(--danger)}.notice.success{background:var(--greenSoft);border-color:color-mix(in srgb,var(--green) 40%,transparent);color:var(--green)}.notice.info{background:var(--primarySoft);border-color:color-mix(in srgb,var(--primary) 30%,transparent);color:var(--primaryStrong)}.array{flex-wrap:nowrap;overflow-x:auto;padding:28px 4px 30px}.cell{flex:none;transition:filter .2s,opacity .2s,transform .2s,box-shadow .2s;min-height:44px}.cell.dim{opacity:.45}.cell.active{box-shadow:0 0 0 3px var(--card),0 0 0 5px var(--orange)}.cell.found{background:linear-gradient(180deg,#5fd3a5,var(--green))}.cell.inwin{box-shadow:0 0 0 3px var(--card),0 0 0 5px var(--cyan)}.cell .ptr{position:absolute;top:-24px;left:50%;transform:translateX(-50%);font-size:11px;font-weight:900;color:var(--orange);white-space:nowrap}.vrows{display:grid;gap:14px;padding:18px 2px 6px;overflow-x:auto}.vrow{display:grid;grid-template-columns:96px 1fr;gap:10px;align-items:center}.vrow-label{font-size:11px;font-weight:850;color:var(--muted-foreground);text-transform:uppercase;letter-spacing:.06em}.vrow-cells{display:flex;align-items:center;gap:6px;min-height:46px;padding:14px 0 18px}.vcell{position:relative;min-width:42px;height:42px;padding:0 10px;border-radius:12px;border:1px solid var(--border);background:var(--card);display:grid;place-items:center;font-weight:850;font-variant-numeric:tabular-nums}.vcell.active{border-color:var(--orange);background:var(--orangeSoft)}.vcell.done{border-color:color-mix(in srgb,var(--primary) 40%,var(--border));background:var(--primarySoft);color:var(--primaryStrong)}.vcell.found{border-color:var(--green);background:var(--greenSoft);color:var(--green)}.vcell.inwin{border-color:var(--cyan);background:var(--cyanSoft)}.vcell .ptr{position:absolute;bottom:-19px;left:50%;transform:translateX(-50%);font-size:10px;font-weight:900;color:var(--orange);white-space:nowrap}.varrow{font-weight:900}.varrow,.vempty{color:var(--muted-foreground)}.vempty{font-size:12px}.vtree{display:flex;justify-content:center;overflow-x:auto;padding:12px 0}.vtree svg{max-width:100%;height:auto}.vgrid{display:grid;gap:4px;justify-content:center;padding:14px 0}.vgrid span{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;font-size:12px;font-weight:850;background:var(--muted);color:var(--muted-foreground);border:1px solid var(--border)}.vgrid span.land{background:color-mix(in srgb,var(--green) 22%,var(--card));color:var(--green)}.vgrid span.active{outline:3px solid var(--orange);outline-offset:-3px}.editor .cm-editor{background:var(--code-bg);color:var(--code-text);min-height:330px;max-height:62vh;font-size:13px}.editor .cm-editor.cm-focused{outline:none}.editor .cm-scroller{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.65}.editor .cm-gutters{background:var(--code-bg);color:#6e7681;border:0}.editor .cm-activeLine,.editor .cm-activeLineGutter{background:rgba(110,118,129,.12)}.editor .cm-cursor{border-left-color:#e6edf3}.editor .cm-focused .cm-selectionBackground,.editor .cm-selectionBackground{background:rgba(56,139,253,.35)!important}.editor-status{font-size:12px;color:var(--code-muted)}.code-result.fail{background:var(--dangerSoft)}.code-result.fail strong{color:var(--danger)}.code-result.info{background:var(--muted)}.code-result.info strong{color:var(--foreground)}.case-list{display:grid;gap:8px;margin-top:10px}.case{border:1px solid var(--border);background:var(--card);border-radius:12px;padding:10px 12px;font:12px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace;overflow-x:auto}.case b{font-family:Inter,ui-sans-serif,system-ui,sans-serif}.case .ok{color:var(--green)}.case .bad{color:var(--danger)}.case pre{padding:0;white-space:pre-wrap;font:inherit;color:var(--muted-foreground)}.problem h3{font-size:15px;margin:18px 0 8px}.example{white-space:pre-wrap}.problem code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;background:var(--muted);padding:1px 5px;border-radius:6px;color:var(--foreground)}.problem ul{padding-left:20px;margin:0}.locked{display:grid;place-items:center;text-align:center;gap:10px;padding:40px 20px;min-height:330px}@media(max-width:620px){.vrow{grid-template-columns:1fr}.vcell{min-width:36px;height:36px}.vgrid span{width:30px;height:30px}}}@layer components{:where(.ua) :where(h1){font-size:2em;font-weight:700;margin:0 0 .67em}:where(.ua) :where(h2){font-size:1.5em;font-weight:700;margin:0 0 .83em}:where(.ua) :where(h3){font-size:1.17em;font-weight:700;margin:0 0 1em}:where(.ua) :where(h4){font-weight:700;margin:0 0 1.33em}:where(.ua) :where(p){margin:0 0 1em}:where(.ua) :where(ul:not([class]),ol:not([class])){margin:0 0 1em;padding-left:40px}:where(.ua) :where(ul:not([class])){list-style:disc}:where(.ua) :where(ol:not([class])){list-style:decimal}:where(.ua) :where(strong,b){font-weight:700}:where(.ua) :where(small){font-size:80%}}@layer components{.article .article-content{font-size:16px;line-height:1.75}.article .article-content blockquote{margin-top:20px;background:var(--primarySoft);border:0;border-left:4px solid var(--primary);padding:15px 16px;border-radius:0 14px 14px 0;color:var(--foreground)}.article .article-content .katex-display{background:var(--muted);border:1px solid var(--border);padding:20px;border-radius:14px;margin:20px 0;font-size:1.15em;overflow-x:auto}.article .lead{color:var(--muted-foreground)}.app-main .tp-container{padding-left:0;padding-right:0;max-width:none}.topic-btn{gap:10px}.topic-btn span{flex:none}.guide-body{font-size:16px;line-height:1.75;color:color-mix(in srgb,var(--foreground) 88%,var(--muted-foreground))}.guide-body h2{font-size:23px;margin:34px 0 10px}.guide-body h2,.guide-body h3{color:var(--foreground);scroll-margin-top:90px}.guide-body h3{font-size:18px;margin:24px 0 8px}.guide-body p{margin:0 0 14px}.guide-body code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;background:var(--muted);border:1px solid var(--border);padding:1px 5px;border-radius:6px;color:var(--foreground)}.guide-body .callout{margin:18px 0}.guide-body .callout p{font-size:14px;margin:4px 0 0}.guide-list{margin:0 0 14px;padding-left:22px;display:grid;gap:6px}ul.guide-list{list-style:disc}ol.guide-list{list-style:decimal}.guide-table{overflow-x:auto;margin:16px 0 20px;border:1px solid var(--border);border-radius:var(--rMD)}.guide-table table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.5}.guide-table td,.guide-table th{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border);vertical-align:top}.guide-table th{background:var(--muted);color:var(--foreground);font-weight:800;white-space:nowrap}.guide-table tr:last-child td{border-bottom:0}.guide-code{margin:18px 0 22px;background:var(--code-bg);border-radius:18px;overflow:hidden;color:var(--code-text)}.guide-code-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;background:var(--code-bar);padding:6px 8px 6px 6px}.guide-code-tabs{display:flex;gap:2px;overflow-x:auto}.guide-code-tabs button{border:0;background:transparent;color:var(--code-muted);font-size:12px;font-weight:800;padding:7px 11px;border-radius:9px;white-space:nowrap}.guide-code-tabs button[aria-selected=true]{background:#0d1117;color:#e6edf3}.guide-code-tabs button:hover{color:#e6edf3}.guide-copy{border:1px solid #30363d;background:transparent;color:#c9d1d9;font-size:12px;font-weight:700;padding:5px 10px;border-radius:8px}.guide-code pre{margin:0;padding:16px 18px;overflow:auto;max-height:560px;font:13px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre}.guide-code pre code{background:none;border:0;padding:0;color:inherit;font-size:inherit}.guide-output{border-top:1px solid var(--code-line);background:var(--code-foot);padding:10px 18px 4px}.guide-output span{font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#3fb950}.guide-output pre{padding:6px 0 10px;max-height:none;color:#c9d1d9}.tok-controlKeyword,.tok-definitionKeyword,.tok-keyword,.tok-modifier,.tok-operatorKeyword{color:#ff7b72}.tok-string,.tok-string2{color:#a5d6ff}.tok-atom,.tok-bool,.tok-null,.tok-number{color:#79c0ff}.tok-comment{color:#8b949e;font-style:italic}.tok-className,.tok-namespace,.tok-typeName{color:#ffa657}.tok-propertyName.tok-definition,.tok-variableName.tok-definition{color:#d2a8ff}.tok-propertyName{color:#79c0ff}.tok-meta{color:#ff7b72}.tok-operator,.tok-punctuation{color:#c9d1d9}.guide-diagram{margin:16px 0 20px;padding:16px 18px;background:var(--muted);border:1px solid var(--border);border-radius:var(--rMD);font:14px/1.45 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--foreground);overflow-x:auto;white-space:pre}.guide-toc{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 20px}.guide-toc a{font-size:12px;font-weight:750;color:var(--muted-foreground);background:var(--muted);border:1px solid var(--border);border-radius:999px;padding:5px 10px}.guide-toc a:hover{color:var(--primary);border-color:var(--primary)}}@layer components{}@layer components{}@layer components{}.apt-hero .eyebrow{background:var(--greenSoft);color:var(--green)}.apt-sample{padding:22px;display:grid;gap:14px}.apt-q{font-size:16px;font-weight:750;line-height:1.45;margin:0}.apt-options{list-style:none;margin:0;padding:0;display:grid;gap:8px}.apt-options li{display:flex;align-items:center;gap:10px;border:1px solid var(--border);border-radius:var(--rMD);padding:10px 12px;font-size:14px}.apt-options li span{width:24px;height:24px;border-radius:8px;background:var(--muted);display:grid;place-items:center;font-size:12px;font-weight:850;flex:none}.apt-options li.right{border-color:var(--green);background:var(--greenSoft)}.apt-options li.right span{background:var(--green);color:#fff}.apt-options li strong{margin-left:auto;color:var(--green)}.apt-why{margin:0;font-size:13px;color:var(--muted-foreground)}.apt-section{padding-bottom:0}#sections,#tests,.apt-section>[id]{scroll-margin-top:84px}.apt-topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.apt-topic{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:16px}.apt-topic h3{font-size:15px;margin:0 0 3px}.apt-topic h3 a{color:inherit;text-decoration:none}.apt-topic h3 a:hover{color:var(--primary)}.apt-topic p{margin:0;font-size:12.5px;color:var(--muted-foreground)}.apt-actions{display:flex;gap:8px;flex:none}@media(max-width:820px){.apt-topics{grid-template-columns:1fr}}@media(max-width:620px){.apt-topic{flex-direction:column;align-items:stretch}.apt-actions .btn{flex:1;justify-content:center}}.choice.apt{grid-column:1/-1;display:flex;gap:14px;align-items:center}.choice.apt h3{margin:0 0 4px}.choice.apt .choice-icon{flex:none;background:var(--greenSoft);color:var(--green)}.article-content.explanation blockquote{margin:10px 0 2px;padding:9px 12px;border:1px solid color-mix(in srgb,var(--green) 35%,transparent);background:var(--greenSoft);border-radius:var(--rMD);color:var(--foreground)}.article-content.explanation blockquote p{margin:0}.article-content.explanation blockquote strong:first-child{color:var(--green)}.article-content.explanation blockquote strong:first-child:before{content:"⚡ "}@layer components{.wordmark img{width:214px;height:auto}.public-mobile-actions{display:none;align-items:center;gap:8px}.public-menu{position:relative}.public-menu-trigger svg{width:19px;height:19px}.public-menu-trigger:focus-visible{outline:3px solid var(--primary);outline-offset:3px}.public-menu-trigger[aria-expanded=true]{background:var(--primarySoft);border-color:color-mix(in srgb,var(--primary) 35%,var(--border));color:var(--primaryStrong)}.public-menu-panel{position:absolute;right:0;top:52px;width:min(320px,calc(100vw - 32px));padding:12px;background:var(--card);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);z-index:80}.public-menu-panel nav{display:grid;gap:2px}.public-menu-panel nav a{padding:11px 12px;border-radius:10px;color:var(--muted-foreground);font-size:14px;font-weight:750}.public-menu-panel nav a.active,.public-menu-panel nav a:focus-visible,.public-menu-panel nav a:hover{background:var(--primarySoft);color:var(--primaryStrong)}.public-menu-account{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}.public-menu-account .btn{padding-inline:10px}@media(max-width:1050px){.public-actions,.public-links{display:none}.public-mobile-actions{display:flex}}@media(max-width:440px){.public-nav{height:66px}.public-menu-panel{top:48px}}}@layer components{.home-page{overflow:hidden;color:var(--home-ink)}.home-page h1,.home-page h2,.home-page h3{font-family:var(--font-jakarta),var(--font-inter),sans-serif}.home-page a{outline-offset:4px}.home-page a:focus-visible{outline:3px solid var(--primary)}.home-kicker{margin:0 0 8px!important;color:var(--primaryStrong);font-size:12px!important;font-weight:850;letter-spacing:.09em;text-transform:uppercase}.home-hero{position:relative;min-height:650px;padding-block:72px 86px;display:grid;grid-template-columns:minmax(0,1.03fr) minmax(440px,.97fr);gap:72px;align-items:center}.home-hero:before{content:"";position:absolute;left:-18%;top:7%;width:430px;height:430px;border-radius:50%;background:color-mix(in srgb,var(--primary) 7%,transparent);filter:blur(2px);z-index:-1}.home-hero-copy{max-width:690px}.home-eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border:1px solid color-mix(in srgb,var(--primary) 22%,var(--border));border-radius:999px;background:color-mix(in srgb,var(--home-wash) 74%,var(--card));color:var(--primaryStrong);font-size:12px;font-weight:800;letter-spacing:.02em}.home-eyebrow svg{width:14px;height:14px}.home-hero h1{font-size:clamp(54px,5.25vw,76px)!important;line-height:1.02!important;letter-spacing:-.055em;margin:22px 0 20px!important;max-width:760px}.home-hero h1 span{position:relative;display:inline-block;color:var(--primaryStrong)}.home-hero h1 span:after{content:"";position:absolute;left:1%;right:-1%;bottom:-8px;height:9px;background:var(--home-pencil);border-radius:80% 12% 75% 16%;opacity:.75;transform:rotate(-1.1deg);z-index:-1}.home-lead{max-width:600px;margin:0!important;color:var(--home-muted);font-size:19px!important;line-height:1.65}.home-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.home-actions .btn{min-height:48px;padding-inline:20px}.home-actions svg,.home-next-note>.btn svg{width:17px;height:17px}.home-primary-cta{box-shadow:0 10px 24px color-mix(in srgb,var(--primary) 26%,transparent)}.home-proof{list-style:none!important;margin:24px 0 0!important;padding:0!important;display:flex;flex-wrap:wrap;gap:10px 18px;color:var(--home-muted);font-size:12.5px;font-weight:750}.home-proof li{display:flex;align-items:center;gap:6px}.home-proof svg{width:15px;height:15px;padding:2px;border-radius:50%;background:var(--greenSoft);color:var(--green);stroke-width:3}.home-desk{position:relative;padding:28px 26px 34px 8px;transform:rotate(1deg)}.home-desk:before{content:"";position:absolute;inset:4% 1% 3% 5%;border-radius:30px;background:linear-gradient(145deg,var(--home-wash-strong),color-mix(in srgb,var(--cyanSoft) 45%,var(--home-wash)));transform:rotate(4deg);z-index:-2}.home-notebook{position:relative;overflow:hidden;padding:34px 30px 28px 50px;background-color:var(--home-paper);background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 31px,var(--home-paper-rule) 32px);border:1px solid color-mix(in srgb,var(--primary) 13%,var(--border));border-radius:10px 24px 24px 10px;box-shadow:0 24px 60px rgba(39,54,87,.14);transform:rotate(-1deg)}.home-notebook:before{content:"";position:absolute;left:25px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 55%,transparent)}.home-tape{position:absolute;z-index:2;top:10px;left:42%;width:92px;height:26px;background:color-mix(in srgb,var(--home-pencil) 60%,transparent);transform:rotate(-5deg);opacity:.8}.home-pencil{position:absolute;right:4px;bottom:22px;width:12px;height:150px;border-radius:10px;background:linear-gradient(90deg,#e88543 0 28%,#f6ad68 28% 74%,#d97736 74%);box-shadow:0 8px 14px rgba(39,54,87,.18);transform:rotate(12deg)}.home-pencil:after{content:"";position:absolute;bottom:-20px;border-left:6px solid transparent;border-right:6px solid transparent;border-top:22px solid #d8b58e}.home-notebook-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:24px}.home-notebook-heading span{color:var(--home-muted);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.home-notebook-heading h2{margin:4px 0 0!important;font-size:25px!important;letter-spacing:-.03em}.home-notebook-heading>svg{width:24px;height:24px;color:var(--orange)}.home-plan{list-style:none!important;margin:0!important;padding:0!important;display:grid;gap:12px}.home-plan li{display:grid;grid-template-columns:38px 1fr auto;gap:12px;align-items:center;min-height:62px;padding:9px 10px 9px 8px;background:color-mix(in srgb,var(--home-paper) 88%,transparent);border-radius:12px}.home-plan-check{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;background:var(--primarySoft);color:var(--primaryStrong)}.home-plan-check svg{width:17px;height:17px}.home-plan li:nth-child(2) .home-plan-check{background:var(--cyanSoft);color:var(--cyan)}.home-plan li:nth-child(3) .home-plan-check{background:var(--orangeSoft);color:var(--orange)}.home-plan strong{display:block;font-size:14px}.home-plan small{display:block;margin-top:2px;color:var(--home-muted);font-size:11.5px}.home-plan-time{color:var(--home-muted);font:700 11px/1 var(--font-inter),sans-serif;white-space:nowrap}.home-desk-sample{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:22px;padding-top:14px;border-top:1px dashed color-mix(in srgb,var(--primary) 30%,var(--border));font-size:11px;color:var(--home-muted);text-transform:uppercase;letter-spacing:.06em;font-weight:800}.home-desk-sample a{display:inline-flex;align-items:center;gap:7px;color:var(--primaryStrong);font-size:12px;text-transform:none;letter-spacing:0}.home-desk-sample svg{width:14px;height:14px}.home-lanes-section{position:relative;padding-block:74px 50px;background:linear-gradient(180deg,color-mix(in srgb,var(--home-wash) 54%,var(--background)),color-mix(in srgb,var(--background) 98%,transparent))}.home-lanes-section:before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(to right,color-mix(in srgb,var(--primary) 6%,transparent) 1px,transparent 1px),linear-gradient(to bottom,color-mix(in srgb,var(--primary) 6%,transparent) 1px,transparent 1px);background-size:32px 32px;mask-image:linear-gradient(180deg,transparent,black 18%,black 78%,transparent)}.home-lanes-section>.shell{position:relative}.home-section-heading{max-width:680px;margin-bottom:34px}.home-section-heading h2{margin:0 0 10px!important;font-size:clamp(32px,3vw,44px)!important;line-height:1.14;letter-spacing:-.04em}.home-section-heading>p:last-child{margin:0!important;color:var(--home-muted);font-size:15px;line-height:1.65}.home-lanes{display:grid;gap:14px}.home-lane{position:relative;display:grid;grid-template-columns:52px 58px minmax(0,1fr) auto;gap:18px;align-items:center;min-height:154px;padding:25px 26px;border:1px solid color-mix(in srgb,var(--primary) 12%,var(--border));border-radius:18px;background:color-mix(in srgb,var(--card) 94%,transparent);box-shadow:0 4px 0 color-mix(in srgb,var(--primary) 7%,transparent);transition:transform .18s ease,border-color .18s ease}.home-lane:hover{transform:translateX(4px);border-color:color-mix(in srgb,var(--primary) 40%,var(--border))}.home-lane-number{align-self:start;color:color-mix(in srgb,var(--home-muted) 55%,transparent);font:800 12px/1 var(--font-jakarta),sans-serif;letter-spacing:.08em}.home-lane-icon{width:52px;height:52px;display:grid;place-items:center;border-radius:16px;background:var(--primarySoft);color:var(--primaryStrong)}.home-lane-icon svg{width:23px;height:23px}.home-lane-copy h3{margin:0 0 6px!important;font-size:21px!important;letter-spacing:-.025em}.home-lane-copy>p:not(.home-kicker){max-width:680px;margin:0!important;color:var(--home-muted);font-size:13.5px;line-height:1.55}.home-lane-copy ul{list-style:none!important;margin:13px 0 0!important;padding:0!important;display:flex;flex-wrap:wrap;gap:7px}.home-lane-copy li{padding:5px 8px;border-radius:7px;background:var(--muted);color:var(--home-muted);font-size:10.5px;font-weight:750}.home-text-link{display:inline-flex;align-items:center;gap:8px;color:var(--primaryStrong);font-size:13px;font-weight:850;white-space:nowrap}.home-text-link svg{width:17px;height:17px;transition:transform .16s}.home-text-link:hover svg{transform:translateX(3px)}.home-lane-code .home-lane-icon{background:var(--cyanSoft);color:var(--cyan)}.home-lane-code .home-kicker,.home-lane-code .home-text-link{color:var(--cyan)}.home-lane-aptitude .home-lane-icon{background:var(--greenSoft);color:var(--green)}.home-lane-aptitude .home-kicker,.home-lane-aptitude .home-text-link{color:var(--green)}.home-loop-section{padding-block:66px 76px}.home-section-heading-wide{max-width:none;display:grid;grid-template-columns:1fr minmax(280px,460px);gap:70px;align-items:end}.home-section-heading-wide>p{padding-bottom:4px}.home-loop{position:relative;list-style:none!important;margin:42px 0 0!important;padding:0!important;display:grid;grid-template-columns:repeat(4,1fr)}.home-loop li{position:relative;padding:0 22px 0 0}.home-loop li:not(:last-child):after{content:"";position:absolute;z-index:0;left:58px;right:0;top:29px;height:1px;background:linear-gradient(90deg,color-mix(in srgb,var(--primary) 42%,var(--border)),color-mix(in srgb,var(--green) 42%,var(--border)))}.home-loop-icon{position:relative;z-index:1;width:58px;height:58px;display:grid;place-items:center;margin-bottom:22px;border:1px solid color-mix(in srgb,var(--primary) 20%,var(--border));border-radius:50%;background:var(--background);color:var(--primaryStrong)}.home-loop-icon svg{width:21px;height:21px}.home-loop-number{color:var(--home-muted);font-size:10px;font-weight:850;letter-spacing:.1em}.home-loop h3{margin:7px 0 6px!important;font-size:18px!important}.home-loop p{max-width:210px;margin:0!important;color:var(--home-muted);font-size:12.5px;line-height:1.55}.home-next-section{padding-bottom:58px}.home-next-note{position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(280px,.8fr) minmax(360px,1fr) auto;gap:36px;align-items:center;padding:38px 40px;border:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));border-radius:26px;background:var(--home-paper);box-shadow:var(--shadowSm)}.home-next-note:before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:linear-gradient(var(--primary),var(--cyan),var(--home-pencil))}.home-next-note h2{margin:0 0 8px!important;font-size:27px!important;line-height:1.22;letter-spacing:-.035em}.home-next-note>div:first-child>p:last-child{margin:0!important;color:var(--home-muted);font-size:13px;line-height:1.55}.home-sample-links{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.home-sample-links a{display:grid;grid-template-columns:auto 1fr auto;gap:9px;align-items:center;padding:10px;border-radius:11px;color:var(--home-ink);background:var(--muted)}.home-sample-links a>svg:first-child{width:18px;height:18px;color:var(--primaryStrong)}.home-sample-links a>svg:last-child{width:13px;height:13px;color:var(--home-muted)}.home-sample-links span{font-size:11px;font-weight:800;line-height:1.25}.home-sample-links small{display:block;margin-bottom:2px;color:var(--home-muted);font-size:9px;font-weight:750;text-transform:uppercase;letter-spacing:.06em}.home-next-note>.btn{justify-self:end}@media(max-width:1180px){.home-hero{grid-template-columns:minmax(0,1fr) minmax(400px,.9fr);gap:38px}.home-next-note{grid-template-columns:1fr auto}.home-sample-links{grid-column:1/-1;grid-row:2}.home-next-note>.btn{grid-column:2;grid-row:1}}@media(max-width:900px){.home-hero{min-height:0;padding-block:56px 74px;grid-template-columns:1fr;gap:54px}.home-hero-copy{max-width:720px}.home-desk{width:min(620px,90%);margin:auto}.home-lane{grid-template-columns:42px 52px 1fr}.home-text-link{grid-column:3;justify-self:start}.home-lane-number{grid-row:1/3}.home-section-heading-wide{grid-template-columns:1fr;gap:8px}.home-next-note{grid-template-columns:1fr}.home-next-note>.btn,.home-sample-links{grid-column:auto;grid-row:auto}.home-next-note>.btn{justify-self:start}}@media(max-width:640px){.home-hero{padding-block:42px 60px;gap:44px}.home-hero:before{width:280px;height:280px}.home-hero h1{font-size:44px!important;letter-spacing:-.05em;margin-block:18px!important}.home-lead{font-size:16px!important;line-height:1.6}.home-actions{display:grid}.home-actions .btn{width:100%}.home-proof{display:grid;gap:9px;margin-top:20px!important}.home-desk{width:100%;padding:19px 12px 25px 0}.home-notebook{padding:29px 17px 23px 37px}.home-notebook:before{left:20px}.home-pencil{display:none}.home-tape{left:38%;width:74px}.home-notebook-heading h2{font-size:21px!important}.home-plan li{grid-template-columns:34px 1fr;gap:9px}.home-plan-time{display:none}.home-desk-sample{align-items:flex-start;flex-direction:column}.home-lanes-section{padding-block:58px 38px}.home-section-heading{margin-bottom:26px}.home-section-heading h2{font-size:31px!important}.home-lane{grid-template-columns:46px 1fr;gap:13px;padding:21px 18px}.home-lane-number{display:none}.home-lane-icon{width:46px;height:46px}.home-lane-copy{grid-column:2}.home-lane-copy h3{font-size:18px!important}.home-lane-copy ul{gap:5px}.home-text-link{grid-column:2}.home-loop-section{padding-block:52px 62px}.home-loop{grid-template-columns:1fr 1fr;gap:30px 16px}.home-loop li{padding:0}.home-loop li:after{display:none}.home-loop-icon{margin-bottom:15px}.home-next-section{padding-bottom:24px}.home-next-note{padding:29px 22px 25px}.home-next-note h2{font-size:24px!important}.home-sample-links{grid-template-columns:1fr}.home-next-note>.btn{width:100%}}}@layer components{.tp-page{position:relative;padding-bottom:48px}.tp-page-header{position:relative;margin-bottom:8px;border-bottom:1px dashed color-mix(in srgb,var(--primary) 24%,var(--border))}.tp-page-header:after{content:"";position:absolute;left:0;bottom:-2px;width:86px;height:3px;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--cyan),var(--home-pencil))}.tp-page-header h1,.tp-section-head h1,.tp-section-head h2,.tp-section-heading h2{font-family:var(--font-jakarta),var(--font-inter),sans-serif;letter-spacing:-.035em!important}.tp-page-header h1{font-size:clamp(27px,3vw,38px)!important;line-height:1.15}.tp-page-header>div>div>div>p:first-child{font-weight:750}.tp-breadcrumbs ol{padding:5px 8px;border-radius:9px;background:color-mix(in srgb,var(--muted) 72%,transparent)}.tp-section-heading{padding-top:8px}.tp-section-heading h2{font-size:20px}.tp-section-head{position:relative;margin-bottom:22px;padding-bottom:14px;border-bottom:1px dashed color-mix(in srgb,var(--primary) 22%,var(--border))}.tp-section-head:after{content:"";position:absolute;left:0;bottom:-2px;width:58px;height:3px;border-radius:999px;background:var(--home-pencil)}.tp-stat-card{position:relative;overflow:hidden;box-shadow:none!important;border-color:color-mix(in srgb,var(--primary) 14%,var(--border))!important}.tp-stat-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--primary),var(--cyan))}.tp-stat-card p:nth-child(2){font-family:var(--font-jakarta),var(--font-inter),sans-serif}.tp-empty,.tp-empty-state{position:relative;overflow:hidden;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 31px,color-mix(in srgb,var(--home-paper-rule) 65%,transparent) 32px)!important;border-style:dashed!important}.tp-empty-mark{display:grid;place-items:center;width:38px;height:38px;margin:0 auto 12px;border-radius:12px;background:var(--primarySoft);color:var(--primaryStrong);font-size:16px}.tp-notice{border-left-width:4px!important}.tp-status-wrap{background:radial-gradient(circle at 25% 20%,color-mix(in srgb,var(--primary) 12%,transparent),transparent 28rem)}.tp-status-card{position:relative;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 31px,color-mix(in srgb,var(--home-paper-rule) 55%,transparent) 32px)!important;box-shadow:0 18px 60px rgba(39,54,87,.1)!important}.app-shell{max-width:none;background:linear-gradient(90deg,color-mix(in srgb,var(--card) 96%,transparent) 0 var(--sidebarW),transparent var(--sidebarW))}.app-sidebar{border-right:1px solid color-mix(in srgb,var(--primary) 17%,var(--border));box-shadow:8px 0 28px rgba(39,54,87,.035)}.app-sidebar:after{content:"";position:absolute;right:18px;top:88px;bottom:20px;width:1px;background:color-mix(in srgb,var(--home-pencil) 34%,transparent);pointer-events:none}.side-label{font-size:10px!important;letter-spacing:.12em!important;color:color-mix(in srgb,var(--muted-foreground) 80%,transparent)!important}.nav-btn{position:relative;border:1px solid transparent!important}.nav-btn.active{border-color:color-mix(in srgb,var(--primary) 16%,transparent)!important;box-shadow:inset 3px 0 var(--primary)}.app-main{position:relative;background-image:linear-gradient(to right,color-mix(in srgb,var(--primary) 3.5%,transparent) 1px,transparent 1px),linear-gradient(to bottom,color-mix(in srgb,var(--primary) 3.5%,transparent) 1px,transparent 1px);background-size:40px 40px}.app-main:before{content:"";position:fixed;inset:0 0 0 var(--sidebarW);pointer-events:none;background:linear-gradient(var(--background),transparent 150px);z-index:-1}.app-top{border-bottom-style:dashed!important}.app-main :where(.rounded-2xl.border.bg-card,.rounded-3xl.border.bg-card){border-color:color-mix(in srgb,var(--primary) 12%,var(--border));box-shadow:0 3px 0 color-mix(in srgb,var(--primary) 6%,transparent)}.app-main .view-in :where(h1,h2,h3){font-family:var(--font-jakarta),var(--font-inter),sans-serif;letter-spacing:-.025em}.app-main [data-slot=card]{border-color:color-mix(in srgb,var(--primary) 13%,var(--border));border-radius:15px;box-shadow:0 3px 0 color-mix(in srgb,var(--primary) 6%,transparent)}.app-main [data-slot=table-container]{border-radius:14px}.app-main :where(.bg-card.rounded-lg.shadow,.bg-card.rounded-lg.shadow-soft){border:1px solid color-mix(in srgb,var(--primary) 13%,var(--border));border-radius:14px!important;box-shadow:0 3px 0 color-mix(in srgb,var(--primary) 6%,transparent)!important}.app-main :where(input,select,textarea){border-color:color-mix(in srgb,var(--primary) 15%,var(--border));box-shadow:none!important}.app-main :where(input,select,textarea):focus{border-color:var(--primary)}.app-main :where(table){font-variant-numeric:tabular-nums}.app-main :where(thead){background:color-mix(in srgb,var(--primarySoft) 45%,var(--muted))}.app-main :where(th){font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted-foreground)}.class-card,.content-card,.course,.lesson-card,.metric,.path-card,.resource,.revise-row,.sidebox,.skill-card{box-shadow:none!important;border-color:color-mix(in srgb,var(--primary) 14%,var(--border))!important}.class-card{position:relative;overflow:hidden;border-radius:12px 18px 18px 12px!important;background:var(--home-paper)!important}.class-card:before{content:"";position:absolute;left:8px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 45%,transparent)}.class-card:hover{box-shadow:0 8px 24px color-mix(in srgb,var(--primary) 12%,transparent)!important}.content-card,.course,.path-card{position:relative;overflow:hidden;border-radius:15px!important;background:color-mix(in srgb,var(--home-paper) 96%,var(--card))!important}.content-card:after,.course:after,.path-card:after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--cyan),var(--home-pencil));opacity:.55}.browse-layout{gap:28px!important}.browse-layout .filters{border-radius:14px!important;box-shadow:none!important;background:color-mix(in srgb,var(--home-paper) 94%,var(--card))!important}.filter-btn{border-left:3px solid transparent!important}.filter-btn.active{border-left-color:var(--primary)!important}.topic-box{position:relative;overflow:hidden;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 31px,var(--home-paper-rule) 32px)!important;color:var(--home-ink)!important;border:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));border-radius:12px 24px 24px 12px!important;box-shadow:var(--shadowSm)}.topic-box:before{content:"";position:absolute;left:25px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 55%,transparent)}.topic-box>*{position:relative}.topic-box h1{font-family:var(--font-jakarta),var(--font-inter),sans-serif;color:var(--home-ink)}.topic-box p{color:var(--home-muted)!important}.topic-box .eyebrow{background:var(--primarySoft)!important;color:var(--primaryStrong)!important}.topic-box .btn{background:var(--primary)!important;color:var(--primary-foreground)!important}.resource{grid-template-columns:44px 1fr auto;border-radius:13px!important;background:var(--home-paper)!important}.resource:hover{border-color:color-mix(in srgb,var(--primary) 42%,var(--border))!important}.iconbox,.resico{border-radius:11px!important}.article{position:relative;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 35px,color-mix(in srgb,var(--home-paper-rule) 48%,transparent) 36px)!important;border-radius:12px 24px 24px 12px!important;box-shadow:none!important}.article:before{content:"";position:absolute;left:20px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 48%,transparent)}.article>*{position:relative}.article h1{font-family:var(--font-jakarta),var(--font-inter),sans-serif;letter-spacing:-.035em}.article-wrap:has(.lesson-reading-layout){max-width:1180px}.lesson-reading-layout{display:grid;grid-template-columns:minmax(0,820px) 220px;gap:28px;align-items:start}.lesson-toc{position:sticky;top:100px;padding:18px 0}.lesson-discussion{max-width:820px;margin-top:20px;padding:24px;box-shadow:none!important}.lesson-discussion h2{font-family:var(--font-jakarta),var(--font-inter),sans-serif}.palette,.question-card{box-shadow:none!important;border-color:color-mix(in srgb,var(--primary) 18%,var(--border))!important}.welcome{position:relative;overflow:hidden;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 35px,var(--home-paper-rule) 36px)!important;color:var(--home-ink)!important;border:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));border-radius:12px 24px 24px 12px!important;box-shadow:none!important}.welcome:before{content:"";position:absolute;left:22px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 55%,transparent)}.welcome>*{position:relative}.welcome h1{font-family:var(--font-jakarta),var(--font-inter),sans-serif;color:var(--home-ink)!important}.welcome p{color:var(--home-muted)!important}.welcome .eyebrow{background:var(--primarySoft)!important;color:var(--primaryStrong)!important}.welcome .btn.primary{background:var(--primary)!important;color:var(--primary-foreground)!important}.welcome .btn.secondary{background:var(--card)!important;border-color:var(--border)!important;color:var(--foreground)!important}.focus-wrap{max-width:960px!important}.focus-header{padding-bottom:13px;border-bottom:1px dashed var(--border)}.practice-shell{gap:14px!important}.palette,.practice-card{background:var(--home-paper)!important}.palette{border-radius:14px!important}.visual-steps{display:flex;gap:7px;justify-content:center;margin-top:14px}.visual-steps button{width:10px;height:10px;border:1px solid color-mix(in srgb,var(--primary) 30%,var(--border));border-radius:999px;padding:0;background:var(--surface3)}.visual-steps button[aria-current=step]{width:26px;background:var(--primary)}.visual-steps button:focus-visible{outline:2px solid var(--primary);outline-offset:3px}.auth-page{grid-template-columns:minmax(220px,.7fr) minmax(360px,460px);align-items:center;justify-content:center;gap:80px;min-height:calc(100vh - 74px);padding-block:48px}.auth-note,.auth-page{position:relative;display:grid}.auth-note{gap:5px;padding:44px 36px 38px 54px;background-color:var(--home-paper);background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 35px,var(--home-paper-rule) 36px);border:1px solid var(--border);border-radius:9px 22px 22px 9px;box-shadow:var(--shadow);transform:rotate(-2deg)}.auth-note:before{content:"";position:absolute;left:28px;top:0;bottom:0;width:1px;background:color-mix(in srgb,var(--home-pencil) 55%,transparent)}.auth-note span{color:var(--home-muted);font-size:13px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.auth-note strong{font:800 clamp(34px,4vw,54px)/1 var(--font-jakarta),sans-serif;color:var(--primaryStrong);letter-spacing:-.045em}.auth-card{position:relative;width:100%!important;padding:30px!important;border-radius:16px!important;box-shadow:0 20px 60px rgba(39,54,87,.11)!important}.auth-card h1{margin:14px 0 5px!important;font:800 29px/1.15 var(--font-jakarta),sans-serif;letter-spacing:-.035em}.auth-subtitle{margin:0!important;color:var(--muted-foreground)!important;font-size:14px;line-height:1.55}.auth-footer,.auth-form{margin-top:22px}.auth-footer{padding-top:18px;border-top:1px dashed var(--border);text-align:center;color:var(--muted-foreground);font-size:13px}.site-footer{position:relative;margin-top:54px;border-top:1px solid color-mix(in srgb,var(--primary) 16%,var(--border));background:color-mix(in srgb,var(--home-paper) 92%,var(--background))}.site-footer:before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--cyan),var(--home-pencil),var(--green));opacity:.7}.site-footer-grid{display:grid;grid-template-columns:minmax(230px,1.4fr) repeat(5,minmax(120px,.7fr));gap:34px;padding-block:44px 36px!important}.site-footer-brand{max-width:310px}.site-footer-brand p{margin:14px 0 0;color:var(--home-muted);font-size:13px;line-height:1.65}.site-footer-column strong{font:800 12px/1 var(--font-jakarta),sans-serif;letter-spacing:.07em;text-transform:uppercase}.site-footer-column ul{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:9px}.site-footer-column a{color:var(--home-muted);font-size:13px}.site-footer-column a:hover{color:var(--primaryStrong)}.site-footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding-block:17px 25px!important;border-top:1px dashed var(--border);color:var(--home-muted);font-size:12px}@media(max-width:1050px){.site-footer-grid{grid-template-columns:repeat(3,1fr)}.site-footer-brand{grid-column:1/-1}.auth-page{grid-template-columns:1fr;gap:30px;max-width:560px}.auth-note{display:none}}@media(max-width:820px){.app-main{background-size:32px 32px}.app-main:before{display:none}.tp-page{padding-bottom:34px}.tp-page-header{padding-top:14px!important}.site-footer-grid{grid-template-columns:1fr 1fr;gap:28px}.site-footer-brand{grid-column:1/-1}.lesson-reading-layout{grid-template-columns:1fr}.lesson-toc{display:none}.lesson-discussion{max-width:none}}@media(max-width:620px){.tp-page-header>div,.tp-section-heading{align-items:flex-start}.tp-section-heading{flex-direction:column}.topic-box{padding:25px 22px 25px 40px!important}.topic-box:before{left:20px}.topic-box h1{font-size:30px!important}.auth-page{padding-block:24px}.auth-card{padding:24px 20px!important}.site-footer{margin-top:36px}.site-footer-grid{grid-template-columns:1fr 1fr;padding-block:36px 28px!important}.site-footer-column:last-child{grid-column:1/-1}}}@layer components{.class-grid{gap:0;border-block:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))}.class-card{min-width:0;padding:28px 10px!important;border:0!important;border-right:1px solid color-mix(in srgb,var(--primary) 14%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.class-card:last-child{border-right:0!important}.class-card:before{display:none}.class-card:hover{transform:none!important;background:color-mix(in srgb,var(--primarySoft) 52%,transparent)!important;box-shadow:none!important}.class-card strong{font:800 34px/1 var(--font-jakarta),var(--font-inter),sans-serif;letter-spacing:-.05em}.class-card span{display:block;margin-top:9px;font-size:11px;font-weight:750;letter-spacing:.04em;text-transform:uppercase}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 36px}.course{min-height:0;padding:24px 0!important;border:0!important;border-top:1px solid color-mix(in srgb,var(--primary) 17%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.course:after{display:none}.course h3{margin-top:12px}.course .btn{align-self:flex-start;margin-top:20px!important;padding-inline:0;background:transparent!important;border:0!important;color:var(--primaryStrong)!important}.course .btn:after{content:" →"}.content-grid{gap:0 32px}.content-card{min-height:210px;padding:24px 0!important;border:0!important;border-top:2px solid color-mix(in srgb,var(--primary) 30%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.content-card:after{display:none}.content-card:hover{border-top-color:var(--primary)!important;box-shadow:none!important}.content-card .iconbox{margin-bottom:22px}.path-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 36px}.path-card{min-height:180px;padding:24px 0!important;border:0!important;border-top:1px solid color-mix(in srgb,var(--primary) 19%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.path-card:after{display:none}.path-card:hover{border-top-color:var(--cyan)!important;box-shadow:none!important}.resource-list{gap:0}.resource{padding:18px 0;border:0;border-bottom:1px solid color-mix(in srgb,var(--primary) 15%,var(--border));border-radius:0!important;background:transparent!important}.resource:hover{background:color-mix(in srgb,var(--primarySoft) 25%,transparent)!important}.sidebox{border-radius:10px!important;box-shadow:none!important}.revise-list{gap:0}.revise-row{padding:16px 0!important;border:0!important;border-bottom:1px solid color-mix(in srgb,var(--primary) 15%,var(--border))!important;border-radius:0!important;background:transparent!important}.skill-grid{gap:0 36px}.skill-card{padding:22px 0!important;border:0!important;border-top:1px solid color-mix(in srgb,var(--primary) 17%,var(--border))!important;border-radius:0!important;background:transparent!important}.metric-stack{gap:0}.metric{padding:17px 0!important;border:0!important;border-bottom:1px solid color-mix(in srgb,var(--primary) 15%,var(--border))!important;border-radius:0!important;background:transparent!important}.lab{grid-template-columns:210px minmax(0,1fr);gap:34px;align-items:start}.lab-side{position:sticky;top:96px;padding:6px 0;height:max-content;border:0;border-right:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));border-radius:0;background:transparent}.topic-btn{position:relative;padding:11px 18px 11px 12px;border-radius:0;font-size:13px;line-height:1.35}.topic-btn:before{content:"";position:absolute;right:-1px;top:8px;bottom:8px;width:3px;background:transparent}.topic-btn.active,.topic-btn:hover{background:transparent;color:var(--primaryStrong)}.topic-btn.active:before{background:var(--primary)}.tabs{gap:24px;margin:0 0 22px;border-bottom:1px solid color-mix(in srgb,var(--primary) 17%,var(--border));overflow:visible}.tab{position:relative;padding:10px 0 13px;border:0;border-radius:0;color:var(--muted-foreground);font-size:13px}.tab,.tab:after{background:transparent}.tab:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px}.tab.active{background:transparent;color:var(--foreground)}.tab.active:after{background:var(--primary)}.lesson-card{max-width:900px;padding:22px 0 4px;border:0;border-radius:0;background:transparent;box-shadow:none}.lesson-card h2{font-size:clamp(28px,3vw,38px);letter-spacing:-.035em}.lesson-card>p{max-width:740px;font-size:16px;line-height:1.7}.steps{gap:0;margin-block:26px}.step{padding:18px 0;border-top:1px solid color-mix(in srgb,var(--primary) 14%,var(--border));grid-template-columns:40px 1fr}.stepno{border-radius:50%;background:transparent;border:1px solid color-mix(in srgb,var(--primary) 34%,var(--border))}.lab-practice{grid-template-columns:190px minmax(0,1fr);gap:24px}.lab-practice>div{min-width:0}.practice-shell{grid-template-columns:minmax(280px,.72fr) minmax(540px,1.48fr);gap:22px!important;align-items:start}.practice-card{max-height:calc(100vh - 220px);overflow:auto;padding:18px 22px 28px 0!important;border:0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important;scrollbar-width:thin}.practice-card h2{font:800 clamp(26px,2.4vw,34px)/1.15 var(--font-jakarta),var(--font-inter),sans-serif;letter-spacing:-.035em}.practice-card .example{border:0;border-left:2px solid color-mix(in srgb,var(--cyan) 55%,var(--border));border-radius:0;background:color-mix(in srgb,var(--muted) 58%,transparent)}.code-workspace{min-width:0;position:sticky;top:96px}.editor{border:1px solid #30363d;border-radius:10px;box-shadow:0 18px 48px rgba(4,8,18,.16)}.editorbar{min-height:48px;height:auto;gap:12px}.editor-tools{display:flex;align-items:center;gap:8px}.editor-focus{display:inline-flex;align-items:center;gap:7px;border:1px solid #30363d;border-radius:8px;padding:7px 9px;background:#0d1117;color:#c9d1d9;font-size:12px;font-weight:750}.editor-focus:hover{background:#1c2530}.editor-focus:focus-visible{outline:2px solid #8b87ff;outline-offset:2px}.editor-focus svg{width:15px;height:15px}.editor .cm-editor{min-height:600px;max-height:calc(100vh - 250px);font-size:14px}.editor .cm-scroller{min-height:inherit}.editor-focused{grid-template-columns:1fr}.editor-focused .practice-card{display:none}.editor-focused .editor .cm-editor{min-height:calc(100vh - 230px);max-height:none}.lab:has(.practice-shell.editor-focused){grid-template-columns:1fr}.lab:has(.practice-shell.editor-focused) .lab-side{display:none}.app-main [data-slot=card]{border-width:0 0 1px!important;border-radius:0!important;box-shadow:none!important;background:color-mix(in srgb,var(--card) 48%,transparent)}.app-main :where(.rounded-2xl.border.bg-card,.rounded-3xl.border.bg-card){border-width:0 0 1px!important;border-radius:0!important;box-shadow:none!important}.app-main :where(.bg-card.rounded-lg.shadow,.bg-card.rounded-lg.shadow-soft){border-width:0 0 1px!important;border-radius:0!important;box-shadow:none!important}@media(max-width:1180px){.lab-practice{grid-template-columns:160px minmax(0,1fr);gap:18px}.practice-shell{grid-template-columns:minmax(250px,.7fr) minmax(440px,1.3fr)}}@media(max-width:1050px){.lab,.lab-practice{grid-template-columns:1fr;gap:18px}.lab-side{position:static;display:flex;border-right:0;border-bottom:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));overflow:auto;padding:0}.topic-btn{width:auto;padding:10px 10px 12px;white-space:nowrap}.topic-btn:before{left:8px;right:8px;top:auto;bottom:-1px;width:auto;height:3px}.practice-shell{grid-template-columns:minmax(260px,.7fr) minmax(420px,1.3fr);overflow:visible}.practice-card{max-height:620px}.code-workspace{position:static}.editor .cm-editor{min-height:560px;max-height:none}}@media(max-width:820px){.class-grid{grid-template-columns:repeat(4,1fr)}.class-card:nth-child(4){border-right:0!important}.class-card:nth-child(-n+4){border-bottom:1px solid color-mix(in srgb,var(--primary) 14%,var(--border))!important}.course-grid,.path-grid{grid-template-columns:1fr;gap:0}.content-grid{grid-template-columns:1fr 1fr}.practice-shell{grid-template-columns:1fr}.practice-card{max-height:none;padding-right:0!important}.editor .cm-editor{min-height:560px}.editor-focused .practice-card{display:none}}@media(max-width:620px){.class-grid{grid-template-columns:repeat(2,1fr)}.class-card{border-bottom:1px solid color-mix(in srgb,var(--primary) 14%,var(--border))!important}.class-card:nth-child(2n){border-right:0!important}.class-card:last-child{grid-column:1/-1}.content-grid{grid-template-columns:1fr}.content-card{min-height:0}.tabs{gap:20px}.tab{font-size:12px}.practice-card{padding-top:8px!important}.editorbar{align-items:flex-start;flex-direction:column;padding:10px 12px}.editor-tools{width:100%;justify-content:space-between}.editor-focus span{display:none}.editor .cm-editor{min-height:500px;font-size:13px}.editor-actions{align-items:stretch;flex-direction:column}.editor-actions>div{display:grid!important;grid-template-columns:1fr 1fr}.editor-actions .btn{width:100%}}.browse-layout>*{min-width:0}.browse-layout .filters{padding:4px 18px 4px 0;border:0!important;border-right:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.apt-topics{gap:0 36px}.apt-topic{padding:19px 0!important;border:0!important;border-top:1px solid color-mix(in srgb,var(--primary) 17%,var(--border))!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.focus-wrap .question-card{padding-inline:0;border:0!important;border-top:2px solid color-mix(in srgb,var(--primary) 28%,var(--border))!important;border-radius:0!important;background:transparent!important}.test-layout .palette{padding:18px 0 18px 18px;border:0!important;border-left:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))!important;border-radius:0!important;background:transparent!important}@media(max-width:1050px){.browse-layout .filters{padding:0 0 10px;border-right:0!important;border-bottom:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))!important}.test-layout .palette{padding:18px 0;border-left:0!important;border-top:1px solid color-mix(in srgb,var(--primary) 18%,var(--border))!important}}@media(max-width:620px){.section-head{align-items:flex-start;flex-direction:column}.section-head .btn{max-width:100%;white-space:normal}}}@layer components{body{font-size:16px}.section-head h1,.section-head h2,h1,h2,h3{font-family:var(--font-heading)}.public-links{gap:22px}.public-links a{font-size:13px}.study-page{padding-block:46px 78px}.study-page-intro{display:flex;align-items:end;justify-content:space-between;gap:28px;padding-bottom:24px;border-bottom:1px solid var(--border)}.study-page-intro>div{max-width:760px}.study-page-intro h1{margin:4px 0 8px;font-size:clamp(34px,4vw,52px);line-height:1.08;letter-spacing:-.045em}.study-page-intro p:not(.study-kicker){margin:0;color:var(--muted-foreground);font-size:16px;line-height:1.65}.study-kicker{margin:0!important;color:var(--brand-marker)!important;font-size:13px!important;font-weight:850;letter-spacing:.075em;text-transform:uppercase}.study-promise{display:flex;flex-wrap:wrap;gap:12px 24px;padding:18px 0 6px;color:var(--muted-foreground);font-size:13px;font-weight:700}.study-promise span{display:flex;align-items:center;gap:7px}.study-promise svg{width:16px;height:16px;color:var(--primaryStrong)}.study-grade-overview{max-width:1050px;margin-inline:auto}.study-chapter-list,.study-subject-list{display:grid;margin-top:24px;border-top:1px solid var(--border)}.study-chapter-row,.study-subject-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:18px;padding:24px 4px;border-bottom:1px solid var(--border);transition:background-color .15s ease}.study-chapter-row:hover,.study-subject-row:hover{background:color-mix(in srgb,var(--primarySoft) 35%,transparent)}.study-subject-row .subject-icon{width:48px;height:48px;border-radius:12px}.study-chapter-copy h2,.study-subject-copy h2{margin:0 0 5px;font-size:18px;letter-spacing:-.015em}.study-chapter-copy>p,.study-subject-copy>p{max-width:720px;margin:0;color:var(--muted-foreground);font-size:14px;line-height:1.55}.study-row-meta{display:flex;flex-wrap:wrap;gap:6px 16px;margin-top:10px;color:var(--muted-foreground);font-size:13px}.study-row-meta span+span:before{content:"·";margin-right:16px;color:var(--border)}.study-row-action{display:inline-flex;align-items:center;justify-content:flex-end;gap:8px;min-height:44px;color:var(--primaryStrong);font-size:14px;font-weight:800;white-space:nowrap}.study-row-action svg{width:17px;height:17px;transition:transform .15s ease}.study-row-action:hover svg{transform:translateX(3px)}.study-row-action:focus-visible{outline:2px solid var(--primary);outline-offset:4px;border-radius:4px}.study-chapter-number{display:grid;place-items:center;width:50px;height:50px;border:1px solid color-mix(in srgb,var(--primary) 24%,var(--border));border-radius:50%;color:var(--primaryStrong);font:800 14px/1 var(--font-heading);font-variant-numeric:tabular-nums}.topic-hero{padding-block:34px 16px}.topic-box{padding:28px 0 30px 28px!important;border:0!important;border-left:3px solid var(--primary)!important;border-radius:0!important;background:transparent!important;background-image:none!important;box-shadow:none!important;align-items:center}.topic-box:before{display:none}.topic-box h1{margin:7px 0 8px;font-size:clamp(36px,4vw,52px);letter-spacing:-.045em}.topic-box p{font-size:16px;line-height:1.6}.topic-box .btn{flex:none}.study-topic-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;padding-block:28px 82px}.study-section-intro{margin-bottom:8px}.study-section-intro h2{margin:5px 0;font-size:28px;letter-spacing:-.035em}.study-section-intro>p:last-child{max-width:650px;color:var(--muted-foreground);font-size:14px}.study-journey{list-style:none;margin:0;padding:0}.study-journey-step{display:grid;grid-template-columns:24px 44px minmax(0,1fr) auto;gap:14px;align-items:center;min-height:128px;padding:20px 0;border-bottom:1px solid var(--border)}.study-journey-rail{align-self:stretch;display:flex;flex-direction:column;align-items:center;color:var(--primary)}.study-journey-rail svg{width:20px;height:20px;flex:none;fill:var(--background)}.study-journey-rail span{width:1px;flex:1;margin-top:6px;background:var(--border)}.study-journey-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--primarySoft);color:var(--primaryStrong)}.study-journey-icon svg{width:20px;height:20px}.study-journey-step.is-watch .study-journey-icon{background:var(--cyanSoft);color:var(--cyan)}.study-journey-step.is-practice .study-journey-icon{background:var(--orangeSoft);color:var(--orange)}.study-journey-step.is-test .study-journey-icon{background:var(--greenSoft);color:var(--green)}.study-journey-label{margin:0 0 3px!important;color:var(--muted-foreground);font-size:13px!important;font-weight:750;text-transform:capitalize}.study-journey-copy h2{margin:0 0 4px;font-size:17px}.study-journey-copy>p:not(.study-journey-label){margin:0;color:var(--muted-foreground);font-size:14px;line-height:1.5}.study-journey-meta{display:block;margin-top:7px;color:var(--muted-foreground);font-size:13px}.study-save-note{position:sticky;top:100px;align-self:start;padding:24px 0 24px 22px;border-left:2px solid color-mix(in srgb,var(--primary) 30%,var(--border))}.study-save-note h2{margin:6px 0 8px;font-size:22px;letter-spacing:-.025em}.study-save-note>p:not(.study-kicker){color:var(--muted-foreground);font-size:14px;line-height:1.6}.study-save-note .btn{width:100%;margin-top:8px}.study-text-link{display:block;margin-top:16px;color:var(--primaryStrong);font-size:13px;font-weight:750;text-align:center}.mobile-more-panel{display:none}@media(max-width:1050px){.public-links{gap:16px}.study-topic-layout{grid-template-columns:1fr;gap:26px}.study-save-note{position:static;padding:22px 0;border-left:0;border-top:2px solid color-mix(in srgb,var(--primary) 28%,var(--border))}}@media(max-width:760px){.study-page{padding-block:28px 64px}.study-page-intro{align-items:flex-start;flex-direction:column}.study-page-intro h1{font-size:36px}.study-chapter-row,.study-subject-row{grid-template-columns:auto minmax(0,1fr);gap:14px;padding:22px 0}.study-chapter-row .study-row-action,.study-subject-row .study-row-action{grid-column:2;justify-content:flex-start;min-height:36px}.study-row-meta span+span:before{display:none}.study-row-meta{display:grid;gap:3px}.topic-box{align-items:flex-start;padding:24px 0 26px 18px!important}.topic-box .btn{width:100%}.study-journey-step{grid-template-columns:20px 38px minmax(0,1fr);align-items:start;gap:10px;min-height:0}.study-journey-icon{width:38px;height:38px}.study-journey-step .study-row-action{grid-column:3;justify-content:flex-start;min-height:36px}.mobile-more-panel{position:fixed;display:block;left:10px;right:10px;bottom:82px;z-index:69;padding:18px;background:color-mix(in srgb,var(--card) 97%,transparent);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow)}.mobile-more-panel>strong{display:block;margin-bottom:10px;font:800 14px/1.3 var(--font-heading)}.mobile-more-panel nav{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}.mobile-more-panel a{display:flex;align-items:center;gap:9px;min-height:44px;padding:9px 10px;border-radius:9px;color:var(--muted-foreground);font-size:13px;font-weight:700}.mobile-more-panel a.active,.mobile-more-panel a:hover{background:var(--primarySoft);color:var(--primaryStrong)}.mobile-more-panel svg{width:18px;height:18px}}}.tp-section-head{align-items:flex-end;margin:0 0 28px;padding:0 0 22px 20px;border-bottom:1px solid color-mix(in srgb,var(--primary) 20%,var(--border))}.tp-section-head:before{position:absolute;top:3px;bottom:23px;width:3px;border-radius:99px;background:linear-gradient(to bottom,var(--primaryStrong) 0 70%,var(--home-pencil) 70% 100%)}.tp-section-head:after{display:none}.tp-section-head h1,.tp-section-head h2{margin:0!important;font-size:clamp(30px,3vw,40px)!important;font-weight:800!important;line-height:1.08!important;letter-spacing:-.045em!important}.apt-topic h3{font-size:16px;line-height:1.35}.btn.primary:hover:not(:disabled){background:var(--primary);border-color:var(--primary);transform:translateY(-1px)}.btn.secondary:hover:not(:disabled){background:color-mix(in srgb,var(--muted) 72%,transparent);border-color:color-mix(in srgb,var(--foreground) 34%,var(--border));transform:translateY(-1px)}.btn.sm{min-height:34px;padding:0 11px;border-radius:7px;font-size:13px}@media(max-width:760px){.tp-section-head{align-items:flex-start;flex-direction:column;padding:0 0 20px 16px}.tp-section-head:before{bottom:21px}.tp-section-head h1,.tp-section-head h2{font-size:30px!important}.tp-section-actions{width:100%;padding-top:4px}.tp-section-actions .btn{width:100%}.study-section-directory>a{grid-template-columns:34px minmax(0,1fr);min-height:0;padding:22px 0}.study-section-directory>a>span:last-child{grid-column:2;justify-self:start;margin-top:12px}}@layer components{.shell{max-width:var(--max);padding-inline:clamp(18px,3vw,44px)}.section{padding-block:clamp(38px,5vw,72px)}.btn{position:relative;min-height:44px;padding:10px 17px;border:1px solid transparent;border-radius:var(--rMD);font-family:var(--font-ui);font-size:14px;font-weight:750;letter-spacing:-.01em;box-shadow:none;transition:transform .16s ease,background-color .16s ease,border-color .16s ease,box-shadow .16s ease}.btn.primary{background:var(--primary);border-color:var(--primaryStrong);color:var(--primary-foreground);box-shadow:3px 3px 0 color-mix(in srgb,var(--primaryStrong) 34%,var(--line))}.btn.primary:before{content:"";width:3px;height:16px;background:currentColor;box-shadow:5px -3px 0 currentColor,10px -6px 0 currentColor;opacity:.52;margin-right:11px}.btn.primary:hover:not(:disabled){background:var(--primaryStrong);border-color:var(--primaryStrong);transform:translate(-1px,-1px);box-shadow:5px 5px 0 color-mix(in srgb,var(--primaryStrong) 30%,var(--line))}.btn.secondary{background:transparent;border-color:color-mix(in srgb,var(--foreground) 24%,var(--border));color:var(--foreground)}.btn.secondary:hover:not(:disabled){background:var(--surface2);border-color:color-mix(in srgb,var(--foreground) 46%,var(--border));transform:none}.btn.ghost{color:var(--primaryStrong);border-color:transparent}.btn.ghost:hover{background:var(--primarySoft)}.btn:disabled{background:var(--disabledSoft)!important;border-color:var(--border)!important;color:var(--disabled)!important;box-shadow:none!important}.iconbtn{width:44px;height:44px;border-radius:var(--rMD);border-color:color-mix(in srgb,var(--foreground) 19%,var(--border));background:transparent;transition:background-color .16s ease,border-color .16s ease}.iconbtn:hover{background:var(--surface2);border-color:color-mix(in srgb,var(--foreground) 38%,var(--border))}.home-text-link,.study-row-action,.textbtn{color:var(--primaryStrong);text-decoration-thickness:1px;text-underline-offset:4px}.home-text-link:hover,.study-row-action:hover,.textbtn:hover{text-decoration:underline}.badge{border:1px solid var(--border);border-radius:4px;background:transparent;color:var(--muted-foreground);font:600 10px/1.1 var(--font-code);letter-spacing:.06em;text-transform:uppercase}.eyebrow,.home-eyebrow{border:0!important;border-left:3px solid var(--primary)!important;border-radius:0!important;background:transparent!important;color:var(--brand-marker)!important;padding:2px 0 2px 10px!important;font:700 11px/1.35 var(--font-code)!important;letter-spacing:.075em!important;text-transform:uppercase}.home-kicker,.study-kicker,.tp-section-eyebrow{color:var(--brand-marker)!important;font:600 11px/1.4 var(--font-code)!important;letter-spacing:.09em!important;text-transform:uppercase}.card{border-color:var(--border);border-radius:var(--rLG);background:var(--card);box-shadow:none}.progress{height:7px;border-radius:0;background:var(--surface3)}.progress span{border-radius:0;background:repeating-linear-gradient(90deg,var(--green) 0 18px,transparent 18px 21px),var(--surface3)}.skeleton{background:linear-gradient(90deg,var(--surface2),color-mix(in srgb,var(--surface) 78%,var(--surface2)),var(--surface2));background-size:220% 100%;border-radius:4px}.public-header{background:color-mix(in srgb,var(--background) 94%,transparent);border-bottom-color:var(--border);backdrop-filter:blur(14px)}.public-nav{height:78px}.public-links{gap:28px}.public-links a{position:relative;padding:27px 0 25px;color:var(--muted-foreground);font-size:13px;font-weight:700}.public-links a:after{content:"";position:absolute;left:0;right:100%;bottom:-1px;height:3px;background:var(--primary);transition:right .18s ease}.public-links a.active,.public-links a:hover{color:var(--foreground)}.public-links a.active:after,.public-links a:hover:after{right:0}.brand .wordmark>.mark{width:39px;height:39px}.public-actions{gap:9px}.public-menu-panel{border-radius:var(--rLG)!important;background:var(--card)!important;box-shadow:var(--shadow)!important}.home-page{overflow:hidden}.home-hero{position:relative;min-height:650px;padding-block:clamp(62px,8vw,118px);grid-template-columns:minmax(0,.9fr) minmax(460px,1.1fr);gap:clamp(52px,7vw,108px)}.home-hero:before{content:"01  ·  SMALL STEPS / DEEP UNDERSTANDING";position:absolute;left:clamp(18px,3vw,44px);bottom:24px;color:var(--muted-foreground);font:500 10px/1 var(--font-code);letter-spacing:.11em}.home-hero-copy h1{margin:22px 0;font-family:var(--font-editorial);font-size:clamp(68px,7.2vw,112px);font-weight:520;line-height:.84;letter-spacing:-.055em}.home-hero-copy h1 span{position:relative;color:var(--primaryStrong);font-style:italic}.home-hero-copy h1 span:after{height:3px;background:var(--primary)}.home-lead{max-width:580px;color:var(--muted-foreground);font-size:18px;line-height:1.7}.home-actions{margin-top:30px}.home-proof{margin-top:26px!important;color:var(--muted-foreground);font-size:12px!important}.home-proof svg{color:var(--green)!important}.home-desk{transform:rotate(1deg)}.home-notebook{border-color:var(--border)!important;border-radius:4px 18px 18px 4px!important;background-color:var(--home-paper)!important;background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 35px,color-mix(in srgb,var(--home-paper-rule) 64%,transparent) 36px)!important;box-shadow:10px 14px 0 color-mix(in srgb,var(--green) 12%,var(--surface2)),var(--shadow)!important}.home-notebook:before{background:color-mix(in srgb,var(--primary) 35%,transparent)!important}.home-tape{background:color-mix(in srgb,var(--primary) 28%,transparent)!important}.home-pencil{background:var(--primary)!important}.home-notebook-heading h2{font-family:var(--font-editorial);font-size:32px;font-weight:600;letter-spacing:-.025em}.home-plan-check{border-radius:4px!important}.home-plan-time{font-family:var(--font-code)}.home-lanes-section{border-block:1px solid var(--border);background:color-mix(in srgb,var(--surface) 58%,transparent)}.home-next-note h2,.home-section-heading h2{font-family:var(--font-editorial);font-size:clamp(40px,5vw,68px)!important;font-weight:520!important;line-height:.98!important;letter-spacing:-.04em!important}.home-lanes{border-top:1px solid var(--border)}.home-lane{border-radius:0!important;background:transparent!important;box-shadow:none!important}.home-lane-number,.home-loop-number{font-family:var(--font-code)!important;color:var(--primaryStrong)!important}.home-lane h3{font-family:var(--font-editorial)!important;font-size:clamp(26px,2.2vw,36px)!important;font-weight:600!important;line-height:1.08!important}.home-lane-icon{border-radius:4px!important}.home-loop{border-bottom:1px solid var(--border)}.home-loop li{border-right-color:var(--border)!important;background:transparent!important}.home-loop-icon{border-radius:4px!important;background:var(--accent-surface,var(--cyanSoft))!important;color:var(--green)!important}.home-next-note{border-radius:4px 20px 20px 4px!important;border-left:4px solid var(--primary)!important;background:var(--surface)!important;box-shadow:none!important}.home-sample-links a{border-radius:0!important;border-color:var(--border)!important;background:transparent!important}.apt-study-hero h1,.article h1,.auth-card h1,.cs-study-hero h1,.study-page-intro h1,.topic-box h1,.tp-page-header h1,.welcome h1{font-family:var(--font-editorial)!important;font-weight:560!important;letter-spacing:-.035em!important}.study-page-intro h1,.tp-page-header h1{font-size:clamp(42px,5vw,64px)!important;line-height:1!important}.section-head h1,.section-head h2,.study-section-intro h2,.tp-section-head h1,.tp-section-head h2{font-family:var(--font-editorial)!important;font-weight:580!important;letter-spacing:-.03em!important}.tp-section-head{padding-left:0;border-bottom-color:var(--border)}.tp-section-head:before{left:0;top:auto;bottom:-2px;width:72px;height:3px;background:var(--primary)}.section-head p,.tp-section-description{font-size:15px!important;line-height:1.6!important}.study-page-intro{border-bottom-color:var(--border)}.study-chapter-row,.study-subject-row{padding-block:26px}.study-chapter-row:hover,.study-subject-row:hover{background:color-mix(in srgb,var(--accent) 48%,transparent)}.study-chapter-copy h2,.study-subject-copy h2{font-size:20px}.study-chapter-number{width:52px;height:52px;border:0;border-radius:0;background:var(--surface2);color:var(--primaryStrong);font-family:var(--font-code);font-weight:600}.study-chapter-number:after{content:"";position:absolute}.study-row-meta{font-family:var(--font-code);font-size:11px}.study-journey-step{border-bottom-color:var(--border)}.study-journey-icon{border-radius:4px}.study-journey-label,.study-journey-meta{font-family:var(--font-code);font-size:11px!important}.study-journey-copy h2{font-size:19px}.topic-box{border-left-color:var(--primary)!important}.topic-box h1{font-size:clamp(44px,5vw,68px)!important}.study-save-note{border-left-color:var(--green)}.class-grid{border-color:var(--border)}.class-card strong{font-family:var(--font-editorial)!important;font-weight:600!important;color:var(--primaryStrong)!important}.class-card span{font-family:var(--font-code)}.filter-btn{border-radius:0!important}.filter-btn.active,.filter-btn:hover{background:transparent!important;color:var(--primaryStrong)!important}.filter-btn.active{border-left-color:var(--primary)!important}.study-filter-tab{position:relative;flex:none;min-height:40px;padding:8px 14px;border:0;border-bottom:1px solid var(--border);border-radius:0;color:var(--muted-foreground);font-size:13px;font-weight:700;transition:color .16s ease,border-color .16s ease}.study-filter-tab:hover{color:var(--foreground);border-bottom-color:color-mix(in srgb,var(--primary) 50%,var(--border))}.study-filter-tab.is-active{border-bottom:3px solid var(--primary);color:var(--primaryStrong)}.study-filter-subtab{min-height:34px;padding:6px 9px;border:0;border-radius:4px;color:var(--muted-foreground);font:600 11px/1.35 var(--font-code);letter-spacing:.02em}.study-filter-subtab:hover{background:var(--surface2);color:var(--foreground)}.study-filter-subtab.is-active{background:var(--primarySoft);color:var(--primaryStrong)}.article-wrap{padding-top:30px}.article{padding:clamp(32px,5vw,64px) clamp(26px,6vw,72px)!important;border:1px solid var(--border)!important;border-radius:4px 18px 18px 4px!important}.article:before{left:28px!important;background:color-mix(in srgb,var(--primary) 46%,transparent)!important}.article h1{font-size:clamp(44px,4.25vw,62px)!important;line-height:1.03!important}.article>.lead{max-width:720px;font-size:18px!important;line-height:1.7!important}.article-content{font-size:1.08rem;line-height:1.82}.article-content p{max-width:72ch}.article-content blockquote,.callout{border:0;border-left:3px solid var(--green);border-radius:0;background:var(--cyanSoft)}.article-content table{border-radius:0}.article-content th{background:var(--surface2);font-family:var(--font-code);font-size:11px;text-transform:uppercase;letter-spacing:.04em}.lesson-toc{font-family:var(--font-ui)}.reading-progress{background:var(--primary)!important}.apt-study-hero,.cs-study-hero{border-bottom:1px solid var(--border)}.apt-study-hero h1,.cs-study-hero h1{font-size:clamp(52px,6vw,82px)!important;line-height:.96!important}.apt-worked-example,.cs-path-map{border:1px solid var(--border)!important;border-radius:4px 16px 16px 4px!important;box-shadow:none!important}.apt-topic{border-top-color:var(--border)!important}.apt-topic h3{font-size:19px}.apt-actions .btn.primary:before{display:none}.code-window,.editor{border-radius:6px!important}.code-window pre,.editor,.guide-code{font-family:var(--font-code)}.lab{gap:44px}.practice-shell{grid-template-columns:minmax(300px,.64fr) minmax(620px,1.55fr)!important;gap:30px!important}.practice-shell.editor-focused{grid-template-columns:1fr!important}.practice-card{max-height:calc(100vh - 190px)}.code-workspace{top:92px}.editor .cm-editor{min-height:660px;max-height:calc(100vh - 210px);font-family:var(--font-code)}.topic-btn.active:before{background:var(--primary)}.tabs{border-bottom-color:var(--border)}.tab.active:after{background:var(--primary)}.app-sidebar{background:var(--surface)!important;border-right-color:var(--border)!important}.app-top{background:color-mix(in srgb,var(--background) 94%,transparent)!important;border-bottom:1px solid var(--border)!important}.app-main{background:transparent!important}.app-main:before{display:none!important}.app-main .view-in :where(h1,h2,h3){font-family:var(--font-ui);letter-spacing:-.025em}.app-main .view-in :where(.tp-page-header h1,.study-page-intro h1){font-family:var(--font-editorial)!important}.app-nav a{border-radius:4px!important}.app-nav a.active{background:var(--primarySoft)!important;color:var(--primaryStrong)!important}.app-nav a.active:before{background:var(--primary)!important}.mobile-app-nav{background:color-mix(in srgb,var(--surface) 96%,transparent)!important;border-top-color:var(--border)!important}[data-slot=card]{border-radius:var(--rLG)!important;box-shadow:none!important}[data-slot=button]{border-radius:var(--rMD)!important;font-family:var(--font-ui)}[data-slot=input],input,select,textarea{border-radius:var(--rMD)!important;background:var(--surface)!important;border-color:color-mix(in srgb,var(--foreground) 20%,var(--border))!important}input:focus,select:focus,textarea:focus{border-color:var(--focus)!important}[data-slot=table-container]{border-radius:var(--rMD)!important}.app-main :where(thead){background:var(--surface2)!important}.app-main :where(th){font-family:var(--font-code);font-weight:600}.notice{border-radius:var(--rMD)!important}.empty,.tp-empty,.tp-empty-state{border:0!important;border-block:1px solid var(--border)!important;border-radius:0!important;background-color:transparent!important;background-image:none!important}.tp-empty-mark{border-radius:4px!important;background:var(--primarySoft)!important;color:var(--primary)!important}.site-footer{border-top-color:var(--border);background:var(--surface)}.site-footer:before{height:4px;background:repeating-linear-gradient(90deg,var(--primary) 0 42px,transparent 42px 50px,var(--green) 50px 86px,transparent 86px 94px);opacity:1}.site-footer-column strong{font-family:var(--font-code);font-weight:600}.site-footer-column a{color:var(--muted-foreground)}@media(max-width:1180px){.home-hero{grid-template-columns:minmax(0,.86fr) minmax(420px,1.14fr);gap:42px}.home-hero-copy h1{font-size:76px}.practice-shell{grid-template-columns:minmax(270px,.7fr) minmax(500px,1.3fr)!important}.editor .cm-editor{min-height:600px}}@media(max-width:1050px){.home-hero{grid-template-columns:1fr;min-height:0;padding-bottom:82px}.home-hero-copy{max-width:760px}.home-desk{max-width:780px;margin-inline:auto;width:100%}.practice-shell{grid-template-columns:minmax(250px,.72fr) minmax(430px,1.28fr)!important}.lab-practice{grid-template-columns:1fr!important}.code-workspace{position:static}}@media(max-width:820px){.shell{padding-inline:22px}.public-nav{height:70px}.home-hero-copy h1{font-size:clamp(60px,12vw,82px)}.home-lanes{grid-template-columns:1fr!important}.home-lane{border-right:0!important}.home-loop{grid-template-columns:1fr 1fr!important}.home-loop li:nth-child(2){border-right:0!important}.home-loop li:nth-child(2n):after{display:none}.practice-shell{grid-template-columns:1fr!important}.editor .cm-editor{min-height:580px;max-height:none}.practice-card{max-height:none}.article{padding-left:54px!important}.article:before{left:25px!important}}@media(max-width:620px){.shell{padding-inline:16px}.home-hero{padding-block:44px 76px}.home-hero-copy h1{font-size:clamp(52px,16vw,70px);line-height:.88}.home-lead{font-size:16px}.home-actions .btn{width:100%}.home-proof{display:grid!important;gap:8px!important}.home-notebook{padding:24px 18px 22px 38px!important}.home-next-note h2,.home-section-heading h2{font-size:40px!important}.home-loop{grid-template-columns:1fr!important}.home-loop li{border-right:0!important;border-bottom:1px solid var(--border)}.article{padding:28px 18px 34px 42px!important}.article:before{left:20px!important}.article h1{font-size:40px!important}.article>.lead{font-size:16px!important}.article-content{font-size:1rem;line-height:1.75}.study-page-intro h1,.topic-box h1,.tp-page-header h1{font-size:42px!important}.btn{min-height:46px}.public-menu-account .btn{width:100%}.editor .cm-editor{min-height:520px}}}.tp-section-head{padding-left:0;border-bottom:1px solid var(--border)}.tp-section-head:before{content:"";left:0;right:auto;top:auto;bottom:-2px;width:72px;height:3px;border-radius:0;background:var(--primary)}.tp-section-head h1,.tp-section-head h2{font-family:var(--font-editorial)!important;font-weight:580!important;line-height:1.06!important;letter-spacing:-.03em!important}.btn.primary:hover:not(:disabled){background:var(--primaryStrong);border-color:var(--primaryStrong);transform:translate(-1px,-1px)}.btn.secondary:hover:not(:disabled){background:var(--surface2);border-color:color-mix(in srgb,var(--foreground) 46%,var(--border));transform:none}@media(max-width:760px){.tp-section-head{padding-left:0}.tp-section-head:before{bottom:-2px;width:58px;height:3px}}.legal-page ul{margin:10px 0 0;padding-left:22px;display:grid;gap:8px;font-size:16px;line-height:1.7;color:color-mix(in srgb,var(--foreground) 88%,var(--muted-foreground))}.legal-page a{color:var(--primary);font-weight:650;text-underline-offset:3px}.legal-updated{margin-top:6px;font-size:13px!important;color:var(--muted-foreground)!important}.crumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:4px 0;margin:0;padding:0;list-style:none}.crumb-list li+li:before{content:"/";margin:0 6px;color:var(--muted-foreground);opacity:.7}.crumb-list a{color:inherit;text-underline-offset:3px}.crumb-list a:hover{color:var(--foreground)}.lesson-updated{margin-top:4px;font-size:13px!important;color:var(--muted-foreground)!important}.lesson-byline{display:grid;gap:2px;margin:8px 0 22px}.lesson-byline p{margin:0;font-size:14px!important;line-height:1.55!important}.lesson-byline a{color:var(--primary);font-weight:650;text-underline-offset:3px}.lesson-byline-cred,.soon-badge{color:var(--muted-foreground)}.soon-badge{display:inline-flex;align-items:center;margin-left:6px;padding:2px 7px;border-radius:999px;background:var(--muted);font-size:10.5px;font-weight:700;letter-spacing:.02em;line-height:1.4;white-space:nowrap;vertical-align:middle}.soon-badge--compact{margin-left:0;padding:0 5px;font-size:9px}.study-prefs fieldset.field{border:0;padding:0;min-width:0}.study-prefs legend{padding:0;margin-bottom:8px;font-size:12px;font-weight:800;color:var(--muted-foreground)}.study-prefs legend span{font-weight:500;margin-left:6px}.area-pick{display:flex;flex-wrap:wrap;gap:8px}.area-option{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 14px;border:1px solid var(--border);border-radius:var(--rMD);background:var(--card);color:var(--foreground);font-size:14px;font-weight:650;cursor:pointer}.area-option svg{width:16px;height:16px;color:var(--muted-foreground)}.area-option input{width:16px;height:16px;margin:0;accent-color:var(--primary)}.area-option:has(input:checked){border-color:var(--primary);background:var(--primarySoft)}.area-option:has(input:focus-visible){outline:2px solid var(--primary);outline-offset:2px}.study-prefs-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:16px}.study-prefs-hint{font-size:13px;color:var(--muted-foreground)}.modal .study-prefs-actions{justify-content:flex-end}.modal .study-prefs+.modal-actions{margin-top:8px}.student-learning-more{margin:32px 0 12px;font-size:15px;font-weight:750;color:var(--muted-foreground)}