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:root{--font-inter:"Inter Variable";--font-noto-sans:"Noto Sans Variable";--font-noto-mono:"Noto Sans Mono Variable";--paper:#f7f5f1;--paper-deep:#eeeae3;--ink:#18212d;--muted:#64707d;--line:#d8d3ca;--line-strong:#b9b2a7;--white:#fffdfa;--blue:#2556a8;--blue-soft:#e5ecf8;--purple:#6a3fa0;--purple-soft:#eee7f7;--teal:#0b746b;--teal-soft:#dcefeb;--amber:#9a5a12;--amber-soft:#f5e9d9;--danger:#9a3730;--shadow:0 16px 50px #18212d17;--topbar-height:72px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{background:var(--paper);color:var(--ink);font-family:var(--font-noto-sans,"Noto Sans"), var(--font-inter,Inter), Arial, sans-serif;margin:0;line-height:1.6}h1,h2,h3,h4,button,input,select,textarea,nav{font-family:var(--font-inter,Inter), var(--font-noto-sans,"Noto Sans"), Arial, sans-serif}pre,code,kbd,samp{font-family:var(--font-noto-mono,"Noto Sans Mono"), ui-monospace, 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var(--line);scrollbar-width:thin;background:#f0ede7;position:sticky;overflow-y:auto}.rail-intro{flex-direction:column;padding:22px 20px 12px;display:flex}.rail-intro span,.section-heading>span,.lesson-section>header>span,.module-meta span,.completion-kicker,.version-note strong,.concept-visual figcaption>span{color:var(--blue);font-family:var(--font-noto-mono,"Noto Sans Mono"), monospace;letter-spacing:.1em;text-transform:uppercase;font-size:10px;font-weight:750}.rail-intro strong{margin-top:3px;font-size:12px}.module-list{margin:0;padding:0 10px 16px;list-style:none}.module-list li+li{margin-top:3px}.module-list button{text-align:left;background:0 0;border:1px solid #0000;border-radius:8px;grid-template-columns:30px 1fr 24px;align-items:center;gap:8px;width:100%;min-height:58px;padding:8px 9px;display:grid}.module-list button:hover{background:#fff9}.module-list button.is-current{background:var(--blue-soft);box-shadow:inset 3px 0 0 var(--blue);border-color:#b8c9e7}.module-list-item.is-foundation{border-bottom:1px solid var(--line-strong);margin-bottom:10px;padding-bottom:9px}.module-list-item.is-foundation>button{background:#f0e8f8b8;border-color:#c9b9dd}.module-list-item.is-foundation>button.is-current{background:var(--purple-soft);box-shadow:inset 3px 0 0 var(--purple);border-color:#a98bc8}.module-number{color:var(--blue);font-family:var(--font-noto-mono,"Noto Sans Mono"), monospace;font-size:11px}.module-list-copy{flex-direction:column;min-width:0;line-height:1.25;display:flex}.module-list-copy strong{text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.module-list-copy small{color:var(--muted);margin-top:5px;font-size:10px}.module-status-icon{border:1px solid var(--line);background:var(--paper);width:22px;height:22px;color:var(--teal);font-family:var(--font-noto-mono,"Noto Sans Mono"), 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var(--line);grid-template-columns:130px 1fr;gap:16px;margin-top:26px;padding:16px 0;display:grid}.outcome-line span{color:var(--teal);font-family:var(--font-noto-mono,"Noto Sans Mono"), monospace;letter-spacing:.08em;text-transform:uppercase;font-size:10px;font-weight:750}.outcome-line strong{font-size:14px;font-weight:630;line-height:1.45}.free-path-note{background:var(--blue-soft);border:1px solid #c8d5e9;border-radius:8px;grid-template-columns:130px 1fr;gap:16px;margin-top:14px;padding:13px 15px;display:grid}.free-path-note strong,.lesson-picker-label{color:var(--blue);font-family:var(--font-noto-mono,"Noto Sans Mono"), monospace;letter-spacing:.08em;text-transform:uppercase;font-size:10px;font-weight:750}.free-path-note p{color:#354b6d;margin:0;font-size:12px;line-height:1.5}.lesson-picker-label{margin-top:24px}.section-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 24px;margin-top:22px;display:grid}.section-nav a{color:#4d5864;grid-template-columns:36px 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