@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=DM+Sans:wght@400;500;600;700;800&display=swap');
:root{--paper:#f5f5f0;--surface:#fff;--ink:#17211f;--muted:#77817d;--line:#e6e8e2;--jade:#0c9b77;--jade-dark:#087557;--jade-pale:#e6f6ef;--mint:#64c9a2;--coral:#e77b63;--lilac:#9c83da;--sky:#5f9fe0;--gold:#daa632;--sans:'DM Sans',Inter,system-ui,sans-serif;--mono:'DM Mono',monospace;--shadow:0 10px 30px #1e37230c}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:14px;-webkit-font-smoothing:antialiased}a{color:inherit}.site-frame{min-height:100vh;max-width:1800px;margin:auto;background:var(--paper)}.topbar{height:66px;display:flex;align-items:center;justify-content:space-between;padding:0 38px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:11px;text-decoration:none}.brand-mark{width:34px;height:34px;border-radius:10px;background:#17211f;color:#b8f3d8;display:flex;align-items:center;justify-content:center;font:700 10px var(--mono);letter-spacing:-2px;padding-right:4px;position:relative;box-shadow:inset 0 0 0 1px #ffffff1c}.brand-mark i{position:absolute;right:3px;bottom:2px;color:#80e4b9;font:bold 15px var(--mono);font-style:normal}.brand-name{font-size:14px;font-weight:800;letter-spacing:-.55px}.brand-name span{color:var(--jade);font-weight:600}.top-links{display:flex;gap:34px;margin-left:40px}.top-links a{text-decoration:none;color:#56615e;font-size:12px;font-weight:600}.top-links a:hover{color:var(--jade-dark)}.top-actions{display:flex;align-items:center;gap:18px}.top-progress{font-size:11px;color:#59645f;font-weight:600;display:flex;align-items:center;gap:8px}.status-dot{width:7px;height:7px;background:var(--jade);border-radius:50%;box-shadow:0 0 0 3px var(--jade-pale)}.menu-toggle{display:none;border:0;background:none;font-size:20px}.workspace{display:grid;grid-template-columns:277px minmax(0,1fr);min-height:calc(100vh - 108px)}.sidebar{background:#fafaf7;border-right:1px solid var(--line);padding:28px 18px 22px 24px;display:flex;flex-direction:column;min-height:calc(100vh - 108px)}.side-intro{padding:3px 0 19px}.eyebrow,.section-kicker{font:500 9px var(--mono);letter-spacing:1.7px;color:var(--jade-dark)}.side-intro h2{font-size:21px;line-height:1.18;letter-spacing:-.8px;margin:13px 0 8px}.side-intro h2 span{color:var(--jade)}.side-intro p{color:var(--muted);font-size:11px;margin:0}.side-search{height:36px;border:1px solid #e6e8e2;background:#fff;border-radius:7px;display:flex;align-items:center;padding:0 9px;gap:8px;color:#89928f;margin:0 0 17px}.side-search>span{font-size:21px;line-height:1;transform:rotate(-20deg)}.side-search input{border:0;outline:0;min-width:0;flex:1;background:transparent;font:11px var(--sans);color:var(--ink)}.side-search kbd{border:1px solid var(--line);border-radius:3px;font:9px var(--mono);padding:2px 4px;color:#89928f}.chapter-list{overflow-y:auto;max-height:calc(100vh - 342px);scrollbar-width:thin;scrollbar-color:#d5ddd7 transparent}.part-label{font:500 9px var(--mono);text-transform:uppercase;letter-spacing:1.05px;color:#8a938f;padding:14px 7px 7px}.chapter-button{display:grid;grid-template-columns:22px minmax(0,1fr) 13px;align-items:center;width:100%;gap:7px;text-align:left;border:0;background:transparent;padding:7px 7px;border-radius:6px;cursor:pointer;color:#53605b;font:500 10.5px/1.35 var(--sans);position:relative}.chapter-button:hover{background:#f0f3ef}.chapter-button.active{color:#1d4c3e;background:#e7f5ee;font-weight:700}.chapter-button.active::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:3px;border-radius:3px;background:var(--jade)}.chapter-num{font:10px var(--mono);color:#9aa39e}.chapter-button.active .chapter-num{color:var(--jade-dark)}.chapter-button.done .chapter-num{color:var(--jade)}.chapter-check{font-size:10px;color:var(--jade);font-weight:700}.side-note{margin-top:auto;border-top:1px solid var(--line);padding:16px 2px 0;display:flex;gap:10px;align-items:flex-start}.note-icon{border-radius:6px;background:#edf2eb;width:25px;height:25px;display:grid;place-items:center;color:var(--jade-dark);font:12px var(--mono);flex:none}.side-note strong{font-size:10px}.side-note p{font-size:9px;line-height:1.6;color:var(--muted);margin:4px 0 0}main{min-width:0;padding:0 6.4% 48px}.hero{max-width:1030px;margin:0 auto;padding:40px 0 22px}.hero-top{display:flex;justify-content:space-between;align-items:center}.breadcrumb{font-size:10px;color:#8a948f}.breadcrumb span{margin:0 6px;color:#bdc4bf}.hero-label{display:flex;align-items:center;gap:7px;font:10px var(--mono);text-transform:uppercase;letter-spacing:1.1px;color:var(--jade-dark)}.hero h1{font-size:clamp(29px,4.3vw,48px);max-width:750px;line-height:1.04;letter-spacing:-2px;margin:20px 0 13px}.hero-copy{font-size:13px;color:#67716d;max-width:580px;line-height:1.7;margin:0}.hero-meta{display:flex;gap:19px;margin-top:21px;color:#7a8480;font-size:10px;align-items:center}.meta-item{display:flex;gap:6px;align-items:center}.meta-icon{color:var(--jade);font-size:12px}.hero-actions{display:flex;gap:9px;margin-top:23px}.btn{border:1px solid #dfe5df;border-radius:6px;padding:10px 14px;font:600 10px var(--sans);cursor:pointer;background:white;color:#3d4a44;transition:all .18s}.btn:hover{border-color:var(--jade);color:var(--jade-dark);transform:translateY(-1px)}.btn-primary{background:var(--jade);border-color:var(--jade);color:#fff}.btn-primary:hover{background:var(--jade-dark);color:white}.hero-rule{height:1px;background:var(--line);margin:26px 0 22px}.lesson-layout{max-width:1030px;margin:auto;display:grid;grid-template-columns:minmax(0,1fr) 212px;gap:35px;align-items:start}.lesson-body{min-width:0}.lesson-section{margin:0 0 27px}.lesson-section h2{font-size:17px;letter-spacing:-.4px;margin:0 0 11px;display:flex;align-items:center;gap:10px}.section-marker{width:3px;height:18px;border-radius:3px;background:var(--jade)}.lesson-section p{font-size:12px;color:#59645f;line-height:1.8;margin:0 0 10px}.lesson-section p strong{color:#26322d}.example-card{background:#17211f;border-radius:9px;overflow:hidden;margin:13px 0 8px;box-shadow:var(--shadow)}.code-header{height:34px;border-bottom:1px solid #ffffff13;display:flex;align-items:center;justify-content:space-between;padding:0 12px;color:#94a39d;font:9px var(--mono)}.code-dots{display:flex;gap:4px;margin-right:auto}.code-dots i{width:6px;height:6px;background:#ee8571;border-radius:50%}.code-dots i:nth-child(2){background:#e5bd5a}.code-dots i:nth-child(3){background:#67c89d}.code-file{margin-left:9px}.copy-button{background:transparent;color:#a9b7b0;border:0;cursor:pointer;font:9px var(--mono)}.copy-button:hover{color:#b3f2d5}.code-block{padding:16px 18px;color:#dce9e2;font:12px/1.75 var(--mono);white-space:pre-wrap;overflow-x:auto;margin:0}.output-label{font:9px var(--mono);letter-spacing:1px;color:#89958e;margin-top:12px}.output-block{background:#fff;border:1px solid var(--line);border-radius:7px;padding:10px 13px;color:#56635c;font:11px/1.7 var(--mono);white-space:pre-wrap;margin:6px 0 0}.callout{background:#eaf5ef;border-left:3px solid var(--jade);border-radius:0 6px 6px 0;padding:11px 13px;margin-top:12px}.callout p{margin:0}.lesson-side{position:sticky;top:91px}.side-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px;margin-bottom:13px}.side-card h3{font-size:10px;margin:0 0 11px}.side-card p{font-size:10px;line-height:1.65;color:#75807a;margin:0}.side-card ul{list-style:none;margin:0;padding:0}.side-card li{font-size:9.5px;line-height:1.6;color:#64706a;margin:8px 0;display:flex;gap:7px}.side-card li::before{content:'•';color:var(--jade);font-weight:bold}.progress-track{height:4px;border-radius:5px;background:#e8eee9;margin-top:10px;overflow:hidden}.progress-fill{height:100%;background:var(--jade);transition:width .3s}.exercise-item{padding:10px 0;border-top:1px solid #eef0ec}.exercise-item:first-of-type{border-top:0}.exercise-item p{font-size:10px;color:#56615c;line-height:1.65;margin:0 0 6px}.solution{font-size:9px;color:var(--jade-dark);font-weight:600;cursor:pointer}.solution-text{font-size:9px!important;color:#75807a!important;margin:7px 0 0!important}.solution-text[hidden]{display:none}.chapter-footer{max-width:1030px;margin:30px auto 0;border-top:1px solid var(--line);padding-top:18px;display:flex;align-items:center;justify-content:space-between}.chapter-footer small{display:block;color:#8a938e;font:9px var(--mono);letter-spacing:.8px;margin-bottom:6px}.chapter-footer strong{font-size:11px}.chapter-footer .btn{font-size:10px}.home-wrap{max-width:1030px;margin:0 auto}.home-hero{padding:58px 0 30px;display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}.home-kicker{display:inline-flex;gap:8px;align-items:center;background:#e8f5ee;color:#28745b;border-radius:99px;padding:7px 11px;font:9px var(--mono);letter-spacing:.7px}.home-hero h1{font-size:clamp(38px,5vw,59px);line-height:.99;letter-spacing:-3px;margin:18px 0}.home-hero h1 em{font-style:normal;color:var(--jade)}.home-hero p{font-size:13px;line-height:1.8;color:#68736d;max-width:470px}.home-cta{display:flex;gap:9px;margin-top:21px}.terminal-art{background:#182420;border-radius:13px;padding:0 0 18px;box-shadow:0 18px 38px #17251b1a;transform:rotate(1deg)}.terminal-top{display:flex;align-items:center;padding:12px;gap:5px;border-bottom:1px solid #ffffff15}.terminal-top i{width:7px;height:7px;background:#ef826d;border-radius:50%}.terminal-top i:nth-child(2){background:#e2bc59}.terminal-top i:nth-child(3){background:#65c89c}.terminal-name{font:9px var(--mono);color:#81938a;margin-left:auto}.terminal-code{padding:17px 20px 8px;font:11px/2.05 var(--mono);color:#d6e1da}.terminal-code .comment{color:#7c9288}.terminal-code .green{color:#80e5b2}.terminal-code .yellow{color:#efc36c}.terminal-code .violet{color:#c4a9f3}.terminal-code .prompt{color:#688077}.terminal-result{margin:0 20px;padding:8px 10px;border-radius:5px;background:#ffffff0c;color:#a0ecbc;font:9px var(--mono)}.stats-row{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:8px 0 42px}.stat{padding:0 15px;border-right:1px solid var(--line)}.stat:first-child{padding-left:0}.stat:last-child{border:0}.stat strong{font-size:21px;letter-spacing:-.8px}.stat span{display:block;color:#7c8681;font-size:9px;margin-top:4px}.home-section{margin:0 0 43px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:15px}.section-heading h2{font-size:20px;letter-spacing:-.8px;margin:0}.section-heading p{font-size:10px;color:#7a8580;margin:5px 0 0}.part-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.part-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:13px;cursor:pointer;transition:transform .18s,border-color .18s;text-align:left;min-height:103px}.part-card:hover{transform:translateY(-2px);border-color:#b9ddcc}.part-swatch{width:18px;height:3px;border-radius:4px;background:var(--jade);margin-bottom:11px}.part-card strong{font-size:10px;display:block;line-height:1.4}.part-card small{font-size:9px;color:#89938e;display:block;margin-top:5px}.project-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.project-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px}.project-card h3{font-size:12px;margin:0 0 7px}.project-card p{font-size:10px;color:#737e78;line-height:1.6;margin:5px 0}.project-card .tag{font:8px var(--mono);text-transform:uppercase;letter-spacing:.8px;color:var(--jade-dark)}.resources-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.resource-card{display:block;background:#fff;border:1px solid var(--line);border-radius:7px;padding:11px 12px;text-decoration:none}.resource-card:hover{border-color:#a7d8c2}.resource-card small{color:var(--jade-dark);font:8px var(--mono);text-transform:uppercase;letter-spacing:.9px}.resource-card strong{display:block;font-size:10px;margin:5px 0}.resource-card p{font-size:9px;color:#7b8580;line-height:1.5;margin:0}.notice{background:#fbf2e6;border-left:3px solid #dda845;border-radius:0 6px 6px 0;padding:13px 15px;color:#6b5e49;font-size:10px;line-height:1.7}.article-head{max-width:1030px;margin:auto;padding:29px 0 18px}.article-head h1{font-size:30px;letter-spacing:-1.2px;margin:11px 0 8px}.article-head p{font-size:11px;color:#79837d;margin:0}.empty-state{padding:20px 8px;color:#86908a;font-size:10px}.footer{border-top:1px solid var(--line);padding:14px 38px;display:flex;justify-content:space-between;color:#939b97;font:8px var(--mono);letter-spacing:.8px}.footer-dot{color:var(--jade);padding:0 5px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--jade);outline-offset:3px}
@media(max-width:1000px){.topbar{padding:0 24px}.workspace{grid-template-columns:244px minmax(0,1fr)}.sidebar{padding-left:18px;padding-right:14px}main{padding-left:4%;padding-right:4%}.lesson-layout{grid-template-columns:minmax(0,1fr) 185px;gap:22px}.part-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.topbar{height:58px;padding:0 16px}.top-links{display:none}.menu-toggle{display:block}.top-progress{font-size:10px}.workspace{display:block;min-height:calc(100vh - 100px)}.sidebar{display:none;position:fixed;z-index:30;top:58px;bottom:0;left:0;width:min(310px,88vw);min-height:0;box-shadow:12px 0 30px #17211f1f}.sidebar.open{display:flex}.chapter-list{max-height:calc(100vh - 325px)}main{padding:0 19px 38px}.hero{padding-top:28px}.hero h1{letter-spacing:-1.4px}.hero-meta{gap:11px;flex-wrap:wrap}.lesson-layout{display:block}.lesson-side{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:22px}.side-card{margin:0}.side-card:last-child{grid-column:1/-1}.home-hero{padding:35px 0 20px;grid-template-columns:1fr;gap:23px}.home-hero h1{font-size:45px}.terminal-art{max-width:500px}.stats-row{grid-template-columns:repeat(2,1fr);gap:15px}.stat:nth-child(2){border:0}.stat:nth-child(3){padding-left:0}.project-list,.resources-grid{grid-template-columns:1fr}.chapter-footer{gap:12px}.footer{padding:13px 17px;font-size:7px}.hero-rule{margin:19px 0}.article-head h1{font-size:27px}}
@media(max-width:430px){.brand-name{font-size:12px}.top-progress{gap:6px}.home-hero h1{font-size:39px}.home-cta{flex-wrap:wrap}.lesson-side{grid-template-columns:1fr}.side-card:last-child{grid-column:auto}.chapter-footer .btn{padding:9px}.chapter-footer strong{font-size:10px}.footer span:last-child{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

.topic-list{margin:9px 0 15px;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 12px}.topic-list li{position:relative;padding-left:14px;font-size:10.5px;line-height:1.55;color:#64706a}.topic-list li::before{content:'✓';position:absolute;left:0;top:0;color:var(--jade);font-weight:700}@media(max-width:520px){.topic-list{grid-template-columns:1fr}}