:root{--page-width:1180px;--gutter:32px}
*{box-sizing:border-box}
html{scroll-padding-top:32px}
.wrap{width:min(var(--page-width),calc(100% - var(--gutter)*2));margin-inline:auto}
header.wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:96px;border-bottom:1px solid var(--line)}
header nav{display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.brand{display:inline-flex;align-items:center;gap:9px;white-space:nowrap}
.hero{display:grid;grid-template-columns:minmax(0,1.16fr) minmax(0,1fr);gap:65px;align-items:center;padding-block:98px 78px}
.hero-copy{min-width:0}
.hero h1{font-size:clamp(3.35rem,6.1vw,5.65rem);line-height:1.02;letter-spacing:-.065em;margin:22px 0 26px;max-width:760px}
.hero h1 span{color:var(--accent)}
.hero-copy>p{max-width:520px;font-size:1.06rem;line-height:1.8}
.hero .actions,.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero .hero-note{font-size:.8rem;margin-top:24px}
.terminal{min-width:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface);box-shadow:0 22px 75px #0004;transform:rotate(-1deg)}
.terminal-bar{display:flex;align-items:center;gap:7px;padding:15px 19px;background:var(--raised);border-bottom:1px solid var(--line);font:11px/1.5 ui-monospace,monospace;color:var(--muted)}
.terminal-bar>span:last-child{margin-left:auto}
.terminal-bar i,.terminal-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--line)}
.terminal-bar i:first-child{background:#d47371}.terminal-bar i:nth-child(2){background:#d7b46d}.terminal-bar i:nth-child(3){background:#a4c67b}
.terminal-body{padding:26px 24px 30px;font:12px/1.85 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}
.terminal-line{margin-bottom:12px}.terminal-line:last-child{margin-bottom:0}.terminal-line .muted{color:var(--muted)}
.terminal-footer{padding:13px 22px;border-top:1px solid var(--line);font:11px/1.6 ui-monospace,monospace;color:var(--muted);display:flex;justify-content:space-between;gap:14px}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));padding-block:25px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);gap:25px}
.stats>div{display:flex;gap:12px;align-items:center}.stats strong{font-size:1.6rem;color:var(--text)}.stats span{font-size:.82rem;color:var(--muted)}
section.wrap{padding-block:88px 0;scroll-margin-top:24px}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.7fr);column-gap:80px;align-items:end;margin-bottom:32px}
.section-head .eyebrow{grid-column:1/-1;margin-bottom:14px}.section-head h2{margin:0}.section-head p{margin:0;max-width:450px}
.route-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.lesson{min-width:0;display:flex;flex-direction:column;padding:26px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
.lesson-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:26px}.number{font:14px ui-monospace,monospace;color:var(--muted)}
.lesson h3{margin:0 0 12px}.lesson>p{margin:0 0 23px;font-size:.9rem;line-height:1.7}.lesson details{margin-top:auto}.lesson details p,.lesson details li{font-size:.86rem;line-height:1.75}.lesson label{display:flex;align-items:center;gap:10px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line);font-size:.8rem;min-height:44px;cursor:pointer}
input[type=checkbox]{accent-color:var(--accent);width:17px;height:17px;flex:none}
.progress-track{height:4px;border-radius:4px;background:var(--line);overflow:hidden;margin:20px 0 25px}.progress-fill{height:100%;background:var(--accent);width:0;transition:width .2s ease}
.architecture-grid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:54px;align-items:center}.explainer p{line-height:1.8}.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:23px 0}.tabs button{min-height:44px;padding:10px 18px}.tabs button[aria-selected=true],.tabs button[aria-pressed=true]{background:var(--accent);color:var(--canvas);border-color:var(--accent)}
.panel,.flow{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:28px;min-width:0}.flow-row{display:flex;align-items:center;justify-content:center;gap:12px;margin:18px 0}.node{border:1px solid var(--line);padding:16px;border-radius:5px;text-align:center;min-width:0;font:12px/1.6 ui-monospace,monospace;background:var(--raised);flex:1}.arrow{color:var(--accent);flex:none}.flow>p{font-size:.78rem;text-align:center;margin-bottom:0}.flow .eyebrow{margin-bottom:24px}
.concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.concept{padding:28px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-width:0}.concept h3{margin:12px 0}.concept p{font-size:.9rem;line-height:1.75;margin-bottom:0}.concept .tag{font-size:.7rem}
.lab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.lab-grid h3{margin-top:0}.lab-grid p,.lab-grid li{font-size:.9rem;line-height:1.8}.checklist{display:grid;gap:8px}.checklist label{display:flex;align-items:start;gap:12px;min-height:44px;padding:10px 0;font-size:.9rem;line-height:1.6}.checklist input{margin-top:3px}.panel pre{max-width:100%;overflow-x:auto}.panel .button{margin-top:16px}
footer.wrap{margin-top:90px;padding-block:35px;display:flex;justify-content:space-between;gap:25px;align-items:center;border-top:1px solid var(--line);font-size:.8rem}
footer p{margin:0}footer a{white-space:nowrap}main{min-width:0}article,section{min-width:0}p,li{overflow-wrap:break-word}pre{overflow-x:auto;max-width:100%}.sources{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:26px}.sources a{font-size:.85rem}
@media(min-width:1400px){.hero{padding-block:112px 92px}}
@media(max-width:1000px){.hero{gap:32px}.hero h1{font-size:4.2rem}.terminal-body{padding:23px 18px;font-size:11px}.section-head{column-gap:40px}.lesson{padding:22px}.architecture-grid{gap:30px}}
@media(max-width:900px){.hero{grid-template-columns:minmax(0,1fr);gap:48px;padding-block:65px}.hero-copy>p{max-width:650px}.hero h1{font-size:clamp(3.8rem,9vw,5.8rem);max-width:750px}.terminal{max-width:650px;width:100%;transform:none}.terminal-body{font-size:13px}.route-grid,.concept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.architecture-grid{grid-template-columns:minmax(0,1fr)}.section-head{grid-template-columns:minmax(0,1fr);gap:16px}.section-head p{max-width:600px}section.wrap{padding-top:70px}header nav{gap:20px}.stats>div{flex-direction:column;align-items:start;gap:4px}}
@media(max-width:600px){:root{--gutter:22px}header.wrap{min-height:90px;align-items:start;justify-content:center;flex-direction:column;padding-block:20px;gap:18px}header nav{gap:10px 20px;width:100%;font-size:.8rem}header nav a{min-height:30px;display:inline-flex;align-items:center}.hero{padding-block:48px;gap:34px}.hero h1{font-size:clamp(3.05rem,13vw,4.5rem);letter-spacing:-.06em}.hero-copy>p{font-size:1rem}.hero .actions,.hero-actions{align-items:stretch}.hero .actions .button,.hero-actions .button{justify-content:center}.terminal-body{font-size:11px;padding:22px 17px}.terminal-footer{font-size:10px;padding-inline:16px}.stats{gap:14px;padding-block:21px}.stats strong{font-size:1.3rem}.stats span{font-size:.72rem}.route-grid,.concept-grid,.lab-grid{grid-template-columns:minmax(0,1fr)}section.wrap{padding-top:55px}.section-head{margin-bottom:24px}.lesson{padding:25px}.lesson-top{margin-bottom:22px}.concept{padding:25px}.panel,.flow{padding:22px}.flow-row{gap:8px}.node{padding:13px 9px;font-size:10px}.arrow{font-size:12px}footer.wrap{margin-top:60px;flex-direction:column;align-items:start;padding-block:28px;gap:14px}.sources{gap:12px 18px}}
@media(max-width:360px){:root{--gutter:18px}.hero h1{font-size:2.9rem}.hero .actions,.hero-actions{flex-direction:column}.terminal-bar{padding-inline:14px;font-size:9px}.terminal-body{font-size:10px}.terminal-footer{flex-wrap:wrap;gap:4px}.stats{gap:10px}.stats span{font-size:.68rem}.flow{padding:17px}.node{padding:11px 7px}.tabs button{padding:10px 14px}}
@media(prefers-reduced-motion:reduce){.progress-fill{transition:none}}
.skip-link{position:absolute;left:16px;top:8px;transform:translateY(-180%);z-index:10;background:var(--accent);color:var(--canvas);padding:12px 20px}.skip-link:focus{transform:none}.progress-row{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:.85rem}.progress-row button{padding:8px 14px}.hero-copy>.hero-meta{font:11px/1.8 ui-monospace,monospace;margin-top:25px;color:var(--muted)}.section-note{font-size:.8rem;margin-top:20px}.lab-grid .terminal{transform:none}.lab-grid .terminal-body>p{font-family:system-ui,sans-serif}header nav a{min-height:44px;display:inline-flex;align-items:center}@media(max-width:600px){.progress-row{align-items:start;flex-direction:column}}