:root{--ink:#1b2823;--muted:#68736d;--paper:#f7f8f3;--white:#fff;--line:#e6e9e1;--green:#c9f36a;--green-dark:#2f4822;--orange:#ff875a;--blue:#dcecff;--shadow:0 16px 42px #1b28230e;--sans:'DM Sans',sans-serif;--display:'Space Grotesk',sans-serif;--mono:'DM Mono',monospace}
    *{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.55 var(--sans)}button,input,textarea{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}:focus-visible{outline:3px solid #738e4f;outline-offset:3px}.wrap{width:min(1180px,calc(100% - 48px));margin:auto}.topline{height:4px;background:linear-gradient(90deg,var(--green) 0 38%,#8b9fff 38% 62%,#ffb17f 62% 81%,#8fe3d1 81%)}
    header{height:76px;display:flex;align-items:center;border-bottom:1px solid var(--line);background:#f7f8f3eF;position:sticky;top:0;z-index:8;backdrop-filter:blur(12px)}.nav{display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:10px;align-items:center;font:700 18px var(--display);letter-spacing:-.6px}.brandmark{width:34px;height:34px;background:var(--ink);color:var(--green);border-radius:11px;display:grid;place-items:center;font:700 20px var(--mono);transform:rotate(-4deg)}.navlinks{display:flex;gap:30px;color:#5d6962;font-size:14px;font-weight:600}.navlinks a:hover{color:var(--ink)}.navright{display:flex;align-items:center;gap:12px}.tiny-label{font:11px var(--mono);color:var(--muted)}.avatar{width:34px;height:34px;background:#e8e5ff;color:#56469a;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}.mobile-menu{display:none;border:0;background:none;font-size:22px}
    .hero{padding:70px 0 72px;overflow:hidden;position:relative}.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:60px;align-items:center}.eyebrow{display:flex;align-items:center;gap:9px;font:11px var(--mono);letter-spacing:.07em;text-transform:uppercase;color:#718074}.live-dot{height:7px;width:7px;background:#8bbd37;border-radius:50%;box-shadow:0 0 0 4px #c9f36a55}.hero h1{font:600 clamp(46px,6.2vw,76px)/.99 var(--display);letter-spacing:-5px;margin:22px 0 22px;max-width:600px}.hero h1 em{font-style:normal;color:#657a42}.hero p{font-size:17px;line-height:1.7;color:#657168;max-width:460px;margin:0 0 30px}.actions{display:flex;gap:12px;align-items:center}.btn{border:0;display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:11px;padding:13px 18px;font-weight:700;transition:transform .18s,box-shadow .18s}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--ink);color:white;box-shadow:0 5px 0 #35433c}.btn-primary:hover{box-shadow:0 7px 0 #35433c}.btn-plain{background:transparent;color:var(--ink)}.btn-lime{background:var(--green);color:var(--ink)}.hero-note{font-size:12px;color:#849087;margin-top:18px}.hero-visual{position:relative;min-height:364px;display:grid;place-items:center}.hero-blob{width:370px;height:330px;position:absolute;background:#e8f0dc;border-radius:51% 49% 58% 42% / 42% 48% 52% 58%;transform:rotate(-7deg)}.hero-dots{position:absolute;inset:2px 6px auto auto;width:106px;height:60px;opacity:.45;background-image:radial-gradient(#668445 1.5px,transparent 1.5px);background-size:13px 13px}.editor-card{position:relative;width:min(425px,95%);background:#19231f;color:#f1f4e9;border-radius:17px;box-shadow:0 28px 64px #18251d2b;overflow:hidden;transform:rotate(1.5deg);z-index:1}.editor-top{height:44px;border-bottom:1px solid #ffffff14;padding:0 17px;display:flex;align-items:center;justify-content:space-between;font:11px var(--mono);color:#9ca9a0}.dots{display:flex;gap:5px}.dots i{width:7px;height:7px;border-radius:50%;background:#718078}.dots i:first-child{background:#ff8973}.dots i:nth-child(2){background:#f6ce66}.dots i:nth-child(3){background:#91d77b}.editor-body{padding:23px 22px 15px;font:13px/1.9 var(--mono);min-height:214px}.ln{display:inline-block;width:22px;color:#66736b}.pink{color:#f1a0c3}.yellow{color:#e8d57c}.mint{color:#a8dcaa}.blue{color:#8fc2ee}.editor-footer{padding:12px 18px;border-top:1px solid #ffffff14;display:flex;align-items:center;justify-content:space-between;color:#aab5aa;font-size:11px}.run-pill{border:0;border-radius:7px;background:var(--green);padding:7px 11px;font:500 11px var(--mono);color:#283522}.sticker{position:absolute;z-index:2;bottom:28px;left:7px;background:white;padding:12px 15px;border-radius:12px;box-shadow:var(--shadow);font-size:12px;transform:rotate(-5deg)}.sticker strong{font:600 15px var(--display);display:block}.sticker .star{color:#f5a149}
    .strip{border-block:1px solid var(--line);background:#f0f2ec}.stripin{height:76px;display:flex;align-items:center;justify-content:space-between;gap:22px}.strip-label{font:11px var(--mono);text-transform:uppercase;letter-spacing:.08em;color:#7e8a80}.language-list{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.language{display:flex;align-items:center;gap:7px;padding:8px 12px;border:1px solid #e4e7df;border-radius:9px;background:#ffffff80;font-size:12px;font-weight:700}.lang-icon{font:12px var(--mono);color:#5c7448}.language:nth-child(2) .lang-icon{color:#8060af}.language:nth-child(3) .lang-icon{color:#b28a1e}.language:nth-child(4) .lang-icon{color:#3977bd}
    section{scroll-margin-top:96px}.section{padding:82px 0}.section-head{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:28px}.section-kicker{font:11px var(--mono);text-transform:uppercase;letter-spacing:.09em;color:#7b8a79}.section h2{font:600 clamp(30px,4vw,43px)/1.1 var(--display);letter-spacing:-1.9px;margin:10px 0 0}.section-sub{color:#778179;max-width:375px;margin:0}.track-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.track{border:1px solid var(--line);background:white;border-radius:15px;padding:20px;transition:transform .2s,box-shadow .2s}.track:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.track-top{display:flex;align-items:center;justify-content:space-between}.track-symbol{width:37px;height:37px;border-radius:11px;display:grid;place-items:center;font:15px var(--mono);background:#eff7e7;color:#59823c}.track:nth-child(2) .track-symbol{background:#f2edff;color:#7559b2}.track:nth-child(3) .track-symbol{background:#fff4df;color:#aa7d16}.track:nth-child(4) .track-symbol{background:#e8f2ff;color:#4877b2}.track .count{font:10px var(--mono);color:#8d968f}.track h3{font:600 19px var(--display);margin:17px 0 6px;letter-spacing:-.4px}.track p{margin:0;color:#7b847e;font-size:13px;min-height:40px}.track-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:20px;padding-top:14px;border-top:1px solid #eef0eb;font-size:11px;color:#879088}.arrow{font-size:17px;color:#708557}
    .lessons-section{background:#eff2eb}.lessons-layout{display:grid;grid-template-columns:1fr 285px;gap:38px;align-items:start}.filters{display:flex;align-items:center;gap:8px;margin:0 0 19px;flex-wrap:wrap}.filter{border:1px solid #dfe4da;background:#f8f9f5;border-radius:8px;padding:8px 12px;font-size:11px;font-weight:700;color:#667169}.filter.active{background:var(--ink);color:white;border-color:var(--ink)}.search{margin-left:auto;position:relative}.search input{width:187px;padding:9px 11px 9px 32px;border:1px solid #dfe4da;border-radius:8px;background:#f9faf6;font-size:11px;outline:none}.search input:focus{border-color:#91a57a}.search span{position:absolute;left:11px;top:7px;color:#828e84}.lesson-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}.lesson-card{background:white;border:1px solid #e5e8e1;border-radius:13px;padding:17px;cursor:pointer;transition:.2s}.lesson-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.lesson-top{display:flex;justify-content:space-between;align-items:center}.tag{font:10px var(--mono);padding:5px 8px;border-radius:6px;background:#eef6e2;color:#557a39}.tag.css{background:#f3edff;color:#795eb4}.tag.js{background:#fff4dc;color:#94711f}.tag.python{background:#e8f2ff;color:#3f72ae}.duration{font:10px var(--mono);color:#98a099}.lesson-card h3{font:600 17px var(--display);letter-spacing:-.35px;margin:13px 0 5px}.lesson-card p{font-size:12px;color:#778079;margin:0;min-height:36px}.card-foot{display:flex;justify-content:space-between;align-items:center;margin-top:17px;padding-top:12px;border-top:1px solid #f0f1ed;font-size:10px;color:#8b938c}.level{display:flex;align-items:center;gap:5px}.level i{width:6px;height:6px;border-radius:50%;background:#b6d77a}.level.intermediate i{background:#edb15d}.empty{display:none;padding:35px;text-align:center;color:#778079;grid-column:1/-1}.side-card{background:var(--ink);color:#eff4e7;border-radius:16px;padding:21px;position:sticky;top:102px}.side-eyebrow{font:10px var(--mono);color:#a5c77c;text-transform:uppercase;letter-spacing:.08em}.side-card h3{font:600 21px/1.17 var(--display);letter-spacing:-.7px;margin:14px 0 8px}.side-card p{font-size:12px;color:#a8b4a7;margin:0}.progress-wrap{margin:22px 0 18px}.progress-label{display:flex;justify-content:space-between;font:10px var(--mono);color:#a9b5a8;margin-bottom:8px}.progressbar{height:5px;background:#ffffff20;border-radius:5px;overflow:hidden}.progressbar span{display:block;width:0;height:100%;background:var(--green);transition:width .4s}.side-button{width:100%;padding:11px;border-radius:8px;border:1px solid #ffffff2a;background:#ffffff0d;color:white;font-size:12px;font-weight:700}.recent{border-top:1px solid #ffffff1c;margin-top:18px;padding-top:15px;font-size:10px;color:#afbaab}.recent strong{display:block;color:#f0f3e9;margin-top:5px;font-size:12px}
    .practice{padding:76px 0}.practice-wrap{background:#e6efd9;border-radius:21px;padding:42px;display:grid;grid-template-columns:.85fr 1.15fr;gap:44px;align-items:center;overflow:hidden}.practice h2{font:600 clamp(30px,4vw,44px)/1.05 var(--display);letter-spacing:-2px;margin:13px 0}.practice-copy p{color:#64715e;max-width:350px}.mode-pills{display:flex;gap:6px;margin-top:23px}.mode{border:1px solid #d3ddc9;background:#f7f9f3;border-radius:7px;padding:7px 10px;font:10px var(--mono);color:#64705e}.mode.active{background:#24332a;color:#fff;border-color:#24332a}.playground{border-radius:13px;background:#19231f;box-shadow:0 18px 34px #26342225;overflow:hidden}.play-top{height:41px;padding:0 13px;display:flex;align-items:center;justify-content:space-between;color:#96a49a;font:10px var(--mono);border-bottom:1px solid #ffffff16}.play-top b{font-weight:400}.play-top i{font-style:normal;color:#bce781}.play-editor{display:block;width:100%;height:165px;resize:vertical;border:0;outline:0;background:#19231f;color:#cbd8c7;padding:16px 19px;font:12px/1.75 var(--mono);tab-size:2}.play-bottom{display:flex;justify-content:space-between;align-items:center;padding:10px 13px;border-top:1px solid #ffffff16}.play-bottom small{font:10px var(--mono);color:#849188}.output{min-height:36px;padding:8px 18px 13px;color:#d8e7d5;font:11px/1.5 var(--mono);white-space:pre-wrap}.output:empty{display:none}.footer{padding:30px 0;border-top:1px solid var(--line);color:#7b867e;font-size:11px}.footin{display:flex;justify-content:space-between;align-items:center}.footbrand{font:600 14px var(--display);color:var(--ink)}.footlinks{display:flex;gap:20px}.footlinks a:hover{color:var(--ink)}
    dialog{border:0;padding:0;border-radius:18px;width:min(620px,calc(100% - 30px));box-shadow:0 25px 90px #1119;color:var(--ink)}dialog::backdrop{background:#142019a8;backdrop-filter:blur(3px)}.modal{padding:27px}.modal-head{display:flex;justify-content:space-between}.close{border:0;background:#f0f2ec;border-radius:50%;width:32px;height:32px;font-size:19px}.modal h2{font:600 29px var(--display);letter-spacing:-1px;margin:18px 0 6px}.modal-desc{color:#718077}.modal-content{border-top:1px solid var(--line);margin-top:20px;padding-top:18px}.modal-content h3{font:600 16px var(--display)}.modal-content code{font:12px var(--mono);background:#f0f2eb;padding:2px 5px;border-radius:4px}.modal-content pre{background:#19231f;color:#dbe6d3;border-radius:10px;padding:16px;overflow:auto;font:12px/1.8 var(--mono)}.modal-actions{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.done-note{font-size:11px;color:#7e897f}
    @media(max-width:900px){.hero-grid{gap:25px}.track-grid{grid-template-columns:repeat(2,1fr)}.lessons-layout{grid-template-columns:1fr 250px;gap:20px}.search{margin-left:0}.practice-wrap{padding:30px;gap:25px}}
    @media(max-width:680px){.wrap{width:min(100% - 32px,520px)}header{height:65px}.navlinks{display:none;position:absolute;top:64px;left:0;right:0;padding:18px 24px;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;gap:15px}.navlinks.open{display:flex}.mobile-menu{display:block}.navright .tiny-label{display:none}.hero{padding:48px 0 45px}.hero-grid{grid-template-columns:1fr;gap:10px}.hero h1{font-size:57px;letter-spacing:-3.8px}.hero p{font-size:15px}.hero-visual{min-height:320px}.hero-blob{width:300px;height:270px}.editor-card{width:min(390px,94%)}.sticker{bottom:7px}.stripin{height:auto;min-height:80px;padding:14px 0;display:block}.strip-label{margin-bottom:10px}.language-list{gap:6px}.language{padding:7px 9px;font-size:11px}.section{padding:58px 0}.section-head{display:block}.section-sub{margin-top:12px}.track-grid{gap:10px}.track{padding:15px}.track h3{font-size:17px}.track p{font-size:12px}.track-bottom{margin-top:13px;padding-top:11px}.lessons-layout{grid-template-columns:1fr}.side-card{position:static;grid-row:1}.filters{gap:6px}.filter{padding:7px 9px}.search{width:100%;order:2}.search input{width:100%}.lesson-grid{gap:9px}.lesson-card{padding:13px}.lesson-card h3{font-size:15px}.lesson-card p{font-size:11px}.practice{padding:45px 0}.practice-wrap{grid-template-columns:1fr;padding:25px 18px;gap:20px}.play-editor{height:145px}.footin{align-items:flex-start;gap:15px;flex-direction:column}.footlinks{gap:14px;flex-wrap:wrap}}
    @media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
  
/* Multi-page classroom */
.content-wrap{width:min(1080px,calc(100% - 48px));margin:0 auto}.page-intro{padding:58px 0 34px}.breadcrumb{font:10px var(--mono);color:#829087;letter-spacing:.06em;text-transform:uppercase;margin-bottom:15px}.breadcrumb a:hover{color:var(--ink)}.page-intro h1{font:600 clamp(36px,5vw,57px)/1.04 var(--display);letter-spacing:-2.8px;margin:12px 0}.page-intro p{max-width:650px;color:#66736b;font-size:16px;margin:0}.page-chip{display:inline-flex;align-items:center;gap:7px;font:10px var(--mono);padding:7px 10px;border-radius:7px;background:#edf4e2;color:#547439}.page-chip.css{background:#f3edff;color:#795eb4}.page-chip.js{background:#fff4dc;color:#94711f}.page-chip.python{background:#e8f2ff;color:#3f72ae}.content-section{padding:24px 0 70px}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.course-card{padding:23px;border:1px solid var(--line);border-radius:15px;background:#fff;display:flex;flex-direction:column;min-height:205px;transition:transform .2s,box-shadow .2s}.course-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.course-card h2{font:600 24px var(--display);letter-spacing:-.8px;margin:17px 0 6px}.course-card p{font-size:13px;color:#728078;margin:0;max-width:480px}.course-card-foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:21px;color:#88928b;font:10px var(--mono)}.course-card .arrow{font-size:17px}.catalog-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:19px}.catalog-toolbar .search{margin-left:auto}.catalog-toolbar .search input{width:230px}.lesson-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-index-card{background:white;border:1px solid var(--line);border-radius:12px;padding:17px;display:block;transition:transform .2s,box-shadow .2s}.lesson-index-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.lesson-index-card h3{font:600 17px var(--display);margin:11px 0 5px}.lesson-index-card p{font-size:12px;color:#758078;margin:0}.lesson-index-card .lesson-meta{display:flex;justify-content:space-between;align-items:center;font:10px var(--mono);color:#939d95}.lesson-index-card .lesson-open{display:block;margin-top:14px;padding-top:11px;border-top:1px solid #eef0eb;font-size:11px;color:#627850}.lesson-article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:clamp(20px,4vw,34px);margin:0 0 16px;scroll-margin-top:96px}.lesson-article h2{font:600 25px var(--display);letter-spacing:-.8px;margin:10px 0}.lesson-article>p{color:#65726a;max-width:720px}.lesson-article .step-label{font:10px var(--mono);color:#879387;text-transform:uppercase;letter-spacing:.06em}.code-sample{margin:16px 0;background:#19231f;color:#dbe6d3;padding:17px 19px;border-radius:10px;overflow:auto;font:12px/1.8 var(--mono);white-space:pre}.code-sample .comment{color:#98a995}.lesson-tip{background:#eff5e8;border-left:3px solid #a2c86d;border-radius:0 9px 9px 0;padding:13px 15px;color:#55634d;font-size:12px;margin:15px 0}.lesson-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:17px}.complete-button{border:1px solid #dce5d1;background:#f2f7eb;border-radius:8px;padding:9px 12px;color:#425b31;font-size:11px;font-weight:700}.complete-button[aria-pressed="true"]{background:#dff0ca}.lesson-status{font-size:11px;color:#718077}.quiz{margin-top:18px;border-top:1px solid #edf0e9;padding-top:15px}.quiz h3{font:600 15px var(--display);margin:0 0 10px}.quiz-options{display:flex;gap:8px;flex-wrap:wrap}.quiz-option{border:1px solid #dfe5da;border-radius:8px;background:#fafbf8;padding:8px 11px;font-size:11px;color:#546158}.quiz-option:hover{border-color:#91a57a}.quiz-feedback{min-height:20px;margin:9px 0 0;color:#60794a;font-size:11px}.course-progress{display:flex;justify-content:space-between;align-items:center;gap:12px;background:#eaf0e1;border:1px solid #dce5d4;border-radius:11px;padding:13px 16px;margin:14px 0 18px;font-size:12px;color:#5e6c5a}.course-progress strong{color:var(--ink)}.next-course{display:flex;justify-content:space-between;align-items:center;padding:18px 0 10px;color:#6e7b70;font-size:12px}.next-course a{font-weight:700;color:#445938}.play-page{padding:20px 0 70px}.play-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:18px;align-items:start}.playground{margin:0}.play-help{background:#fff;border:1px solid var(--line);border-radius:13px;padding:19px}.play-help h2{font:600 17px var(--display);margin:0 0 9px}.play-help p,.play-help li{font-size:11px;color:#728078}.play-help ul{padding-left:17px}.play-help .callout{margin-top:14px;background:#f0f5e8;border-radius:8px;padding:11px;color:#5f6b56}.play-result{border:0;background:#fff;width:100%;min-height:160px;padding:14px;border-radius:0 0 11px 11px;color:#24332a}.path-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.path-step{background:#fff;border:1px solid var(--line);border-radius:13px;padding:19px}.path-step .number{font:10px var(--mono);color:#91a078}.path-step h2{font:600 18px var(--display);margin:12px 0 6px}.path-step p{font-size:12px;color:#758078;margin:0}.site-footer .foot-brand{font:600 14px var(--display);color:var(--ink)}.site-footer{padding:25px 0;border-top:1px solid var(--line);color:#7b867e;font-size:11px}.site-footer-inner{width:min(1080px,calc(100% - 48px));margin:auto;display:flex;justify-content:space-between;align-items:center;gap:18px}.site-footer-links{display:flex;gap:18px;flex-wrap:wrap}.site-footer-links a:hover{color:var(--ink)}.card-count{font:10px var(--mono);color:#8d968f}.no-lessons{grid-column:1/-1;display:none;padding:28px;text-align:center;color:#758078}.progress-summary{font:10px var(--mono);color:#748071}.page-split{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}.learning-note{background:#e8efdc;border-radius:15px;padding:23px}.learning-note h2{font:600 22px var(--display);margin:8px 0}.learning-note p{font-size:12px;color:#65715e}.learning-note a{font-weight:700;font-size:12px}.plain-list{padding-left:20px;color:#657168;font-size:13px}.plain-list li{margin:8px 0}
@media(max-width:760px){.content-wrap{width:min(100% - 32px,560px)}.course-grid,.lesson-index{grid-template-columns:1fr}.play-layout{grid-template-columns:1fr}.play-help{order:-1}.path-steps{grid-template-columns:1fr}.page-split{grid-template-columns:1fr}.site-footer-inner{width:min(100% - 32px,560px);align-items:flex-start;flex-direction:column}.catalog-toolbar .search{width:100%;order:2}.catalog-toolbar .search input{width:100%}.page-intro{padding:42px 0 26px}}
.course-card[hidden],.lesson-index-card[hidden]{display:none!important}#output:not(:empty){display:block}.playground .mode-pills{padding:10px 14px 0;margin-top:0}.playground .mode{background:#24322a;border-color:#3d4a40;color:#c0cabd}.playground .mode.active{background:#c9f36a;border-color:#c9f36a;color:#1b2823}
.play-editor:focus-visible{outline:3px solid var(--green);outline-offset:-3px}