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:root{--paper:#f5f6f2;--ink:#161c1a;--muted:#626b65;--line:#dce1d8;--accent:#d7fa64;--soft:#ebeee6;--sans:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:5px}button{font:inherit;color:inherit;cursor:pointer}a,button,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #2e6ea6;outline-offset:5px}::selection{background:var(--accent);color:var(--ink)}[hidden]{display:none!important}.wrap{width:min(1200px,calc(100% - 80px));margin-inline:auto}.skip{position:fixed;left:20px;top:-100px;z-index:20;padding:10px 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/* Reading pages use the same typography and a quiet, open layout. */
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@media(min-width:1320px){.hero{gap:58px}.hero h1{font-size:66px}.hero .actions{gap:20px}.hero .text-link{font-size:13px}.hero .button{padding-inline:18px}}
@media(max-width:1080px){.wrap{width:calc(100% - 48px)}.header-inner{gap:28px}.nav{gap:20px}.hero{gap:32px}.hero h1{font-size:54px}.hero .actions{gap:15px}.hero .button,.hero .text-link{font-size:13px}.bench-content{padding:22px}.bench-foot{display:block}.bench-foot p{max-width:none}.bench-foot a{display:inline-block;margin-top:12px}.route-row{grid-template-columns:50px minmax(0,1fr) 280px;gap:22px}.run-inner{gap:40px}.skill-row{gap:18px}.article-layout{grid-template-columns:170px minmax(0,1fr);gap:38px}}
@media(max-width:820px){.header-inner{gap:20px}.nav{gap:16px;font-size:12px}.brand{font-size:20px}.hero{gap:26px;grid-template-columns:minmax(0,44fr) minmax(0,56fr);padding:52px 0}.hero h1{font-size:46px}.hero .lede{font-size:15px}.workbench-top{padding:16px}.bench-content{padding:18px}.finding h2{font-size:19px}.demo-code{font-size:10px}.route-row{grid-template-columns:38px minmax(0,1fr) 210px;gap:16px}.route-copy h3{font-size:23px}.run-inner{gap:30px}.run-copy h2{font-size:29px}.section-heading{gap:30px}.section-heading h2{font-size:30px}.skill-row{grid-template-columns:1fr 1fr 20px}.skill-evidence{grid-column:2;grid-row:2}.skill-row>span{grid-column:3;grid-row:1}.skill-row>div:first-child{grid-row:1/3}.example-grid{grid-template-columns:repeat(2,1fr);gap:30px}.example-item h3{min-height:0}.closing{gap:30px}.closing h2{font-size:25px}.content-page .skill-row{grid-template-columns:1fr 1.5fr}.content-page .skill-row>div:last-child{grid-column:2}.lesson-row{grid-template-columns:35px 1fr 24px}.lesson-output{grid-column:2}.lesson-row .arrow{grid-column:3;grid-row:1}.article-layout{grid-template-columns:140px minmax(0,1fr);gap:28px}}
@media(max-width:640px){html{scroll-padding-top:90px}.wrap{width:calc(100% - 40px)}.header-inner{height:62px;gap:10px;justify-content:space-between}.brand{font-size:20px;gap:7px;letter-spacing:-.7px}.brand-mark{width:23px;height:23px}.brand-dot{width:6px;height:6px}.nav{display:none}.language-switch{gap:8px;font-size:12px}.language-switch a{padding:12px 2px}.hero{display:block;padding:28px 0 50px}.hero .eyebrow{font-size:10px;margin-bottom:16px;letter-spacing:.04em}.hero h1{font-size:39px;line-height:1.16;letter-spacing:-1.8px;font-weight:660;margin-bottom:18px}.desktop-title{display:none}.mobile-title{display:block}.hero .lede{font-size:15px;line-height:1.75;margin:0;max-width:none}.actions{gap:17px;flex-wrap:nowrap;margin-top:22px}.hero .button{font-size:12px;padding:12px 15px;gap:12px;min-height:46px}.hero .text-link{font-size:12px;white-space:nowrap}.hero-note{display:none}.hero-demo{margin-top:30px}.workbench{border-radius:12px}.workbench-top{padding:15px 18px;font-size:11px}.workbench-badge{font-size:9px}.bench-content{padding:20px 18px}.bench-address{font-size:10px}.demo-tabs{margin:18px 0 22px}.demo-tabs button{min-height:38px;font-size:12px;padding:7px 14px}.finding{min-height:58px;gap:10px}.finding h2{font-size:20px;line-height:1.5}.finding-symbol{width:22px;height:22px;font-size:13px}.code-label{font-size:9px;margin:19px 0 10px}.demo-code{font-size:10px;padding:13px;min-height:120px;line-height:1.85}.demo-result{font-size:11px}.bench-foot{font-size:10px;margin-top:20px;padding-top:15px}.bench-foot a{margin-top:10px}.demo-caption{font-size:10px;margin-top:13px}.section-heading{display:block;margin-bottom:27px}.section-heading h2{font-size:28px;letter-spacing:-.7px;line-height:1.45}.section-heading .eyebrow{font-size:11px;margin-bottom:10px}.section-heading>p{font-size:14px;line-height:1.8;margin-top:15px}.path-section{padding:6px 0 50px}.route-row{grid-template-columns:35px minmax(0,1fr);gap:14px;padding:26px 0}.route-number{font-size:24px}.route-copy h3{font-size:23px;letter-spacing:-.5px;margin-bottom:9px}.route-subtitle{font-size:13px}.route-description{font-size:13px;line-height:1.8;margin-bottom:12px}.route-output{font-size:11px}.route-mechanism{grid-column:2;align-items:flex-start;gap:2px;margin-top:-1px}.mechanism{max-width:275px}.route-mechanism>span{font-size:12px}.run-section{padding:42px 0}.run-inner{display:block}.run-copy .eyebrow{font-size:10px}.run-copy h2{font-size:28px;letter-spacing:-.6px;line-height:1.4;margin-bottom:18px}.run-copy>p:not(.eyebrow){font-size:14px;line-height:1.85;margin-bottom:20px}.run-copy>a{font-size:12px}.run-stamp{font-size:10px;margin-top:22px}.run-output{padding:0 16px 17px;margin-top:28px;border-radius:9px}.terminal-code pre{font-size:9px;max-height:none;line-height:1.8}.run-limit{font-size:11px}.directory-section{padding:50px 0 45px}.skill-row{grid-template-columns:minmax(0,1fr) 18px;gap:8px 14px;padding:20px 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p{font-size:11px}.footer-links{justify-content:flex-start;gap:12px 22px;margin-top:22px}.preview-label{text-align:left;margin-top:3px}.page-head{padding:30px 0 32px}.page-head h1{font-size:35px;letter-spacing:-1px}.page-head .lede{font-size:16px}.page-meta{font-size:11px;line-height:1.8}.breadcrumb{font-size:11px;padding-top:23px}.article-layout{display:block;padding-bottom:50px}.desktop-toc{display:none}.mobile-toc{display:block;border-block:1px solid var(--line);padding:14px 0;margin:0 0 28px;font-size:13px}.mobile-toc ul{list-style:none;padding:0}.mobile-toc li{margin:10px 0}.prose h2{font-size:25px;margin-top:35px}.prose h3{font-size:19px}.prose p,.prose li{font-size:16px;line-height:1.85}.prose pre{padding:16px;font-size:11px}.prose code{font-size:12px}.code-toolbar{font-size:10px;padding:8px 10px;gap:12px}.copy-button{font-size:10px;padding:7px 10px}.callout{padding:18px 20px;font-size:14px}.prose table{font-size:12px}.page-next{flex-wrap:wrap;font-size:13px}.lesson-row{padding:23px 0;gap:13px;grid-template-columns:28px 1fr 16px}.lesson-title{font-size:20px}.lesson-desc{font-size:14px}.lesson-number{font-size:23px}.content-page .skill-row{grid-template-columns:1fr;gap:10px}.content-page .skill-row>div:first-child{grid-row:auto}.content-page .skill-row>div:last-child,.content-page .skill-row>p{grid-column:1;grid-row:auto;margin:0}.section{padding:35px 0}}
@media(max-width:360px){.hero h1{font-size:38px;letter-spacing:-2.2px}.actions{gap:12px}.hero .button{padding-inline:11px}.hero .text-link{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.button:hover{transform:none}}
.mobile-menu{display:none}@media(max-width:640px){.language-switch{margin-left:auto}.mobile-menu{display:block;flex:none}.mobile-menu summary{cursor:pointer;list-style:none;display:grid;place-items:center;width:32px;height:40px}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu summary svg{width:20px;height:20px;stroke:currentColor;stroke-width:1.5;fill:none}.mobile-menu nav{position:absolute;top:61px;left:0;right:0;border-bottom:1px solid var(--line);background:var(--paper);padding:15px 20px;display:grid;grid-template-columns:1fr 1fr;gap:8px 20px;font-size:13px;box-shadow:0 12px 18px -16px #17211944}.mobile-menu nav a{padding:8px 0;text-decoration:none}}
.journey-hero h1{font-size:60px}.journey-hero .text-link{font-size:12px}.journey-hero .hero-note{font-size:10px;max-width:450px}@media(min-width:1320px){.journey-hero h1{font-size:64px}}@media(max-width:1080px){.journey-hero h1{font-size:51px}}@media(max-width:820px){.journey-hero h1{font-size:43px}}@media(max-width:640px){.journey-hero{padding-top:24px}.journey-hero h1{font-size:39px;line-height:1.13;letter-spacing:-1.5px;margin-bottom:16px}.journey-hero .hero-demo{margin-top:26px}.journey-hero .lede{font-size:14px;line-height:1.8}.journey-hero .actions{margin-top:20px}.journey-hero .button{padding-inline:12px}.journey-hero .text-link{font-size:11px}.journey-hero .eyebrow{margin-bottom:14px}}
.usage-modes{display:flex;flex-wrap:wrap;gap:10px 22px;font-size:12px;color:#647357;padding-top:15px}.usage-modes span{display:flex;gap:7px;align-items:center}.usage-modes span::before{content:'';width:4px;height:4px;background:#91a36c;border-radius:50%}.start-paths{display:grid;grid-template-columns:1fr 1fr;gap:32px}.start-path{background:#eaf0df;border-radius:10px;padding:30px;text-decoration:none}.start-path .eyebrow{font:11px var(--mono);color:#7d9061;margin-bottom:16px}.start-path h2{font-size:27px;line-height:1.4;font-weight:620;letter-spacing:-.6px;margin:0 0 14px}.start-path p{font-size:14px;color:var(--muted);margin:0 0 18px}.start-path .text-link{font-size:24px}.existing-links{display:flex;flex-direction:column;gap:9px}.existing-links a{display:flex;gap:15px;align-items:center;font-size:13px}.existing-links strong{font:11px var(--mono);color:#6b8050}@media(max-width:640px){.start-paths{grid-template-columns:1fr;gap:20px}.start-path{padding:24px}.start-path h2{font-size:24px}.usage-modes{font-size:11px;gap:8px 14px}}
.stage-action h3{display:flex;gap:14px;align-items:baseline}.stage-action h3 span{font:12px var(--mono);color:#7d9161}.prose .action-output{font-size:14px;padding-left:16px;border-left:2px solid #cbdba5;color:#60704f}.evidence-note{font-size:12px!important;color:#758269;background:#e8eedf;padding:12px 16px;border-radius:5px}.concept-short-list details{border:none;border-bottom:1px solid var(--line);padding:12px 0;margin:0}.concept-short-list summary{font-size:14px}.concept-short-list p{font-size:14px;margin:14px 0 8px}.concept-short-list a{font-size:12px}.stage-skills>a{display:grid;grid-template-columns:1fr 170px 20px;gap:20px;text-decoration:none;border-block:1px solid var(--line);padding:18px 0;margin-top:-1px}.stage-skills strong{font-size:16px;display:block}.stage-skills div>span{display:block;font-size:13px;color:var(--muted);margin-top:7px}.stage-skills small{font-size:10px;line-height:1.8;color:#718164}.stage-skills>a:hover strong{text-decoration:underline}.concept-funnel{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:20px 0}.concept-funnel>a{text-decoration:none;border-top:2px solid #c2d59b;padding-top:15px}.concept-funnel strong{display:block;font-size:17px}.concept-funnel span{display:block;font-size:13px;color:var(--muted);margin-top:10px}.concept-funnel small{display:block;font-size:11px;color:#7c896f;margin-top:7px}.prose .funnel-note,.funnel-note{font-size:11px;color:var(--muted);line-height:1.8}.concept-entry{border-bottom:1px solid var(--line);padding-bottom:22px}.concept-sources{font-size:11px!important}.concept-filter{font-size:13px;display:flex;align-items:center;gap:18px;margin:32px 0 26px}.concept-filter select{font:inherit;max-width:100%;padding:10px 12px;background:var(--paper);border:1px solid #b9c5ac;border-radius:5px}.prose .editorial-note{font-size:12px;color:var(--muted);line-height:1.8}.curriculum-sources{padding-bottom:30px;border-bottom:1px solid var(--line);margin-bottom:36px}@media(max-width:640px){.stage-skills>a{grid-template-columns:minmax(0,1fr) 15px;gap:12px}.stage-skills small{grid-column:1;grid-row:2}.stage-skills>a>span{grid-column:2;grid-row:1}.concept-funnel{gap:20px 15px;grid-template-columns:repeat(2,minmax(0,1fr))}.concept-funnel strong{font-size:16px}.concept-filter{display:block}.concept-filter select{display:block;margin-top:10px;width:100%}}
.home-concepts{padding:0 0 68px}.home-concepts .concept-funnel{grid-template-columns:repeat(6,minmax(0,1fr));gap:20px}.home-concepts .concept-funnel span{font-size:12px}.home-concepts .concept-funnel small{font-size:10px}.home-resource-links{display:flex;gap:32px;font-size:13px;margin-top:24px}@media(max-width:820px){.home-concepts .concept-funnel{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:640px){.home-concepts{padding-bottom:44px}.home-concepts .concept-funnel{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px 20px}.home-resource-links{display:block;font-size:12px}.home-resource-links a{display:block;margin-top:13px}}
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/* Evidence boundaries and outputs are essential reading, not fine print. */
.route-output{font-size:13px;color:#5c6a51}.home-concepts .concept-funnel small,.concept-funnel small{font-size:12px;line-height:1.7;color:#5b6a50}.home-concepts .concept-funnel span{font-size:13px;color:#596650}.funnel-note,.prose .funnel-note{font-size:12px;color:#626b5b}.bench-foot{font-size:12px;line-height:1.7;color:#b5c3ad}.bench-foot p{max-width:300px}.bench-foot a{font-size:11px}.demo-caption{font-size:12px;color:#5e6958}.run-limit{font-size:12px;color:#afbea4}.skill-evidence>small{font-size:11px;color:#637155}.preview-label{font-size:11px;color:#647358}@media(max-width:640px){.route-output{font-size:12px}.bench-foot{font-size:12px}.bench-foot a{font-size:12px}.demo-caption{font-size:11px}.home-concepts .concept-funnel span{font-size:13px}.home-concepts .concept-funnel small{font-size:12px}.run-limit{font-size:12px}.skill-evidence>small{font-size:11px}}

/* Beginner teaching layer: one story, one task, optional detail. */
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4px;color:#405b31;font-size:19px;font-weight:600}.story-result small{font-size:13px;color:#5c6854}.story-page{padding:18px 22px;background:#f9faf6;border-radius:10px;text-align:center}.story-page>.story-label{text-align:left}.story-timer{font-size:48px;letter-spacing:-2px;line-height:1.2;font-weight:550;font-variant-numeric:tabular-nums}.story-timer span{color:#809569;margin:0 5px}.story-button{display:block;width:fit-content;margin:12px auto;background:var(--accent);border-radius:6px;padding:9px 30px;font-size:13px;font-weight:600}.story-page p{font-size:11px;color:#647357;margin:12px 0 0}.search-story .story-boundary{font-size:12px;line-height:1.75;color:#5b6850;margin:18px 0 0}.beginner-entries{padding:0 0 44px}.beginner-entries>p{font-size:16px;margin:0 0 24px}.beginner-entries>div{display:grid;grid-template-columns:1fr 1fr;gap:40px}.entry-link{display:block;text-decoration:none;border-top:2px solid #bdce9e;padding:20px 0 0}.entry-link>strong{display:block;font-size:18px;font-weight:600;line-height:1.6}.entry-link>strong>span{color:#708854}.entry-link>span,.entry-link>p{display:block;font-size:14px;color:var(--muted);line-height:1.9;margin:10px 0 0;max-width:500px}.entry-link:hover strong{text-decoration:underline}.entry-link h2{font-size:23px;margin:0 0 12px}.entry-link>a{font-size:14px;display:inline-block;margin-top:15px}.beginner-section{padding:46px 0 54px;border-top:1px solid var(--line)}.beginner-section>.eyebrow{color:#637358;margin-bottom:14px}.beginner-section h2{font-size:34px;line-height:1.4;letter-spacing:-1px;font-weight:620;margin:0 0 24px;max-width:800px}.beginner-section-intro{font-size:16px;line-height:1.85;color:var(--muted);max-width:700px;margin:0 0 30px}.beginner-flow ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 34px;list-style:none;padding:0;margin:26px 0}.beginner-flow li{border-top:2px solid #cad7b4;padding-top:17px;font-size:15px;line-height:1.9;position:relative}.beginner-flow li:before{content:'↓';position:absolute;top:-12px;right:0;background:var(--paper);padding-left:12px;color:#83936e}.mechanism-distinction{font-size:14px;color:#64715a;line-height:1.9;max-width:900px;margin:28px 0 0}.home-practice{display:grid;grid-template-columns:.75fr 1fr;gap:70px}.home-practice .eyebrow{color:#637358}.home-practice .prose>p:first-child{font-size:21px;color:#25351b}.home-practice .prose>p:last-child>a{font-size:15px}.beginner-lesson-list{border-top:1px solid var(--line)}.beginner-lesson-row{display:grid;grid-template-columns:52px minmax(0,1fr) 200px 20px;gap:24px;align-items:center;padding:27px 0;border-bottom:1px solid var(--line);text-decoration:none}.beginner-lesson-row h3{font-size:23px;line-height:1.4;font-weight:610;margin:0 0 9px}.beginner-lesson-row p{font-size:15px;color:var(--muted);margin:0;line-height:1.75}.beginner-lesson-output{font-size:13px;color:#667757}.beginner-lesson-row:hover h3{text-decoration:underline}.beginner-takeaway p,.beginner-ai>p{font-size:16px;line-height:1.9;max-width:800px}.beginner-takeaway p:last-child{font-size:13px;color:#667358}.beginner-ai>.text-link{font-size:14px}.beginner-disclosure{margin:14px 0;border:none;border-top:1px solid var(--line);padding:16px 0}.beginner-disclosure>summary{cursor:pointer;font-size:16px;font-weight:560;line-height:1.7}.beginner-disclosure[open]>summary{margin-bottom:18px}.beginner-disclosure>p{font-size:15px!important;line-height:1.9}.home-technical{margin-top:32px}.technical-workbench{max-width:660px;margin:24px 0 32px}.home-technical li{font-size:14px;line-height:1.85;margin:12px 0}.beginner-page .page-head{max-width:850px;padding-bottom:28px}.beginner-page .page-head h1{font-size:48px}.beginner-page .page-head .lede{font-size:23px;line-height:1.6;color:#49553f}.beginner-page .article-layout{grid-template-columns:190px minmax(0,750px);gap:80px}.beginner-page .prose>p:first-child{font-size:18px}.beginner-step{margin:30px 0 38px}.beginner-step:first-of-type{margin-top:32px}.beginner-step h2{font-size:25px;margin:0 0 16px}.prose .one-action{border-left:3px solid #a9c372;padding:4px 0 4px 20px;font-size:19px;line-height:1.85}.worked-record{margin:0;background:#e9eedf;border-radius:8px;padding:22px 24px}.worked-record figcaption{font-size:12px;color:#5d6d4f;margin-bottom:15px}.prose .worked-record pre{background:none;border:none;padding:0;margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:16px/1.95 var(--sans);color:var(--ink)}.lesson-paths h3{font-size:19px;margin:25px 0 10px}.lesson-paths h3:first-child{margin-top:0}.lesson-paths p{font-size:16px}.prose .lesson-save{font-size:13px;color:#68745d;margin-top:24px}.prose .optional-skills p,.prose .optional-skills li{font-size:15px}.optional-skills li>p{font-size:13px!important;color:#68745d;margin:6px 0 16px}.complete-checklist .evidence-note{margin-top:24px}.complete-checklist h2{font-size:23px}.complete-checklist .prose{max-width:100%}.lesson-next{border-top:2px solid #b4c98c;margin-top:40px;padding-top:26px}.lesson-next h2{font-size:25px;margin:0 0 15px}.lesson-next .page-next{gap:24px;align-items:start}.lesson-next .page-next>a{max-width:65%;font-size:14px;line-height:1.7}.beginner-page summary:focus-visible,.entry-link:focus-visible,.beginner-lesson-row:focus-visible{outline:2px solid #718c48;outline-offset:5px}
@media(min-width:1320px){.beginner-hero h1{font-size:64px}}
@media(max-width:1080px){.beginner-hero h1{font-size:51px}.beginner-hero{gap:36px}.search-story{padding:22px}.beginner-page .article-layout{grid-template-columns:160px minmax(0,1fr);gap:45px}.beginner-lesson-row{grid-template-columns:42px minmax(0,1fr) 150px 18px;gap:20px}}
@media(max-width:820px){.beginner-hero h1{font-size:45px}.search-story{padding:20px}.beginner-hero .lede{font-size:15px}.beginner-intro{font-size:14px}.story-result p{font-size:17px}.home-practice{gap:35px}.beginner-section h2{font-size:30px}.beginner-flow ol{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px}.beginner-page .article-layout{grid-template-columns:135px minmax(0,1fr);gap:28px}}
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.mobile-seo-intro{display:none}@media(max-width:640px){.beginner-hero .beginner-intro{display:none}.beginner-entries>.mobile-seo-intro{display:block;font-size:14px;line-height:1.85;margin:0 0 20px}}