.reader{--paper:#faf9f4;--paper-dim:#f2f0e8;--ink:#1c1e1a;--ink-soft:#5c6055;--rule:#dcd8c8;--green:#2e6b4f;--green-bg:#e3ede4;--amber:#874e09;--amber-bg:#f3e6d0;--blue:#385a86;--blue-bg:#e1e8ef;--red:#9c3f3a;--red-bg:#f2e0dd;--mono:"DM Mono", monospace;--sans:Manrope, system-ui, -apple-system, sans-serif;background:var(--paper);min-height:100vh;color:var(--ink);font-family:var(--sans);margin:0;padding:0;line-height:1.6}.reader.dark{--paper:#142019;--paper-dim:#1d2c21;--ink:#edf4eb;--ink-soft:#b4c2b4;--rule:#3b4c3e;--green:#a4d9ad;--green-bg:#203c2a;--amber:#e6bd78;--amber-bg:#493b24;--blue:#a7c4ea;--blue-bg:#293b52;--red:#f1aea6;--red-bg:#4b2d2d}.reader-progress{z-index:100;background:var(--green);transform-origin:0;height:3px;transition:transform .15s linear;position:fixed;inset:0 0 auto}.reader-nav{border-bottom:1px solid var(--rule);background:var(--paper);z-index:90;justify-content:space-between;align-items:center;height:42px;padding:0 4vw;display:flex;position:sticky;top:0}.nav-brand-group{align-items:center;gap:10px;display:flex}.reader-brand{letter-spacing:.08em;color:var(--ink);align-items:center;gap:8px;font:600 11px DM Mono,monospace;text-decoration:none;display:flex}.brand-symbol{background:var(--green);color:#142019;border-radius:5px;place-items:center;width:22px;height:22px;font:700 11px DM Mono,monospace;display:grid}.shell-badge{color:var(--green);background:var(--green-bg);border:1px solid var(--rule);white-space:nowrap;border-radius:4px;padding:2px 7px;font:600 11px DM Mono,monospace}.reader-nav-links{gap:20px;display:flex}.reader-nav-links a{color:var(--ink-soft);text-transform:uppercase;font:500 11px DM Mono,monospace;text-decoration:none}.reader-nav-links a:hover{color:var(--ink)}.nav-actions{align-items:center;gap:8px;display:flex}.shell-language{border:1px solid var(--rule);border-radius:6px;padding:2px;display:flex}.shell-language button{color:var(--ink-soft);cursor:pointer;background:0 0;border:0;border-radius:4px;padding:3px 8px;font:500 11px DM Mono,monospace}.shell-language button.active{background:var(--green);color:#142019;font-weight:700}.reader-theme,.reader-complete{border:1px solid var(--rule);color:var(--ink);cursor:pointer;background:0 0;border-radius:6px;align-items:center;gap:6px;padding:4px 10px;font:500 11px DM Mono,monospace;display:inline-flex}.reader-complete.is-done{border-color:var(--green);color:var(--green);background:var(--green-bg)}.layout{grid-template-columns:220px 1fr;gap:40px;max-width:1040px;margin:0 auto;padding:40px 24px 100px;display:grid}nav.rail{font-family:var(--mono);align-self:start;font-size:12.5px;position:sticky;top:60px}nav.rail ol{border-left:2px solid var(--rule);margin:0;padding:0;list-style:none}nav.rail li{margin:0}nav.rail a{color:var(--ink-soft);border-left:2px solid #0000;align-items:baseline;gap:10px;margin-left:-2px;padding:9px 0 9px 16px;text-decoration:none;transition:color .15s,border-color .15s;display:flex}nav.rail a .n{color:var(--rule);font-weight:600}nav.rail a.active{border-left:2px solid var(--green);color:var(--ink);font-weight:600}nav.rail a.active .n{color:var(--green)}nav.rail a:hover{color:var(--ink)}.reader-main{min-width:0}header.hero{border-bottom:1px solid var(--rule);max-width:720px;margin:0 0 32px;padding-bottom:36px}.eyebrow{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 14px;font-size:12px}header.hero h1{font-family:var(--sans);letter-spacing:-.01em;color:var(--ink);margin:0 0 18px;font-size:clamp(30px,5vw,44px);font-weight:700;line-height:1.1}header.hero p.lede{color:var(--ink-soft);max-width:660px;margin:0 0 24px;font-size:16.5px;line-height:1.6}.startbox{background:var(--paper-dim);border:1px solid var(--rule);border-radius:8px;align-items:flex-start;gap:14px;max-width:660px;margin-bottom:12px;padding:16px 18px;font-size:14px;display:flex}.startbox .ico{font-size:18px;line-height:1.2}.startbox b{font-family:var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--green);margin-bottom:4px;font-size:11px;display:block}.startbox p{color:var(--ink);margin:0;font-size:13.5px;line-height:1.5}.guide-ul,.guide-ol{max-width:680px;margin:16px 0 24px;padding-left:28px}.guide-ul{list-style:outside}.guide-ol{list-style:decimal}.guide-li{color:var(--ink);word-break:normal;overflow-wrap:break-word;margin-bottom:10px;font-size:16px;line-height:1.7}.decision-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;max-width:680px;margin:24px 0 32px;padding:0;list-style:none;display:grid}.decision-card{border:1px solid var(--rule);background:var(--paper-dim);word-break:normal;overflow-wrap:break-word;border-radius:10px;padding:18px 20px;transition:border-color .2s}.decision-card:hover{border-color:var(--green)}.decision-card .tag{font-family:var(--mono);letter-spacing:.04em;background:var(--green-bg);color:var(--green);border-radius:4px;margin-bottom:10px;padding:3px 8px;font-size:11px;font-weight:700;display:inline-block}.decision-card p,.decision-card div{color:var(--ink);margin:0;font-size:14.5px;line-height:1.65}.senior-box,blockquote{border:1px solid var(--rule);background:var(--blue-bg);word-break:normal;overflow-wrap:break-word;border-radius:10px;align-items:flex-start;gap:16px;max-width:680px;margin:24px 0 32px;padding:20px 22px;display:flex}.senior-box>div,blockquote>div{flex:1;min-width:0}.senior-box .ico{flex-shrink:0;font-size:20px;line-height:1.3}.senior-box b{font-family:var(--mono);letter-spacing:.04em;color:var(--blue);margin-bottom:4px;font-size:12px;display:block}.senior-box p,blockquote p{color:var(--ink);margin:4px 0 0;font-size:14.5px;line-height:1.65}.code-block-card{border:1px solid var(--rule);background:var(--paper-dim);border-radius:8px;max-width:720px;margin:20px 0;overflow:hidden}.code-header{border-bottom:1px solid var(--rule);font-family:var(--mono);color:var(--ink-soft);background:#0000000a;align-items:center;gap:6px;padding:8px 14px;font-size:11px;display:flex}.code-header .dot{border-radius:50%;width:9px;height:9px}.code-header .dot.red{background:#ff5f56}.code-header .dot.yellow{background:#ffbd2e}.code-header .dot.green{background:#27c93f}.code-header small{text-transform:uppercase;margin-left:auto;font-weight:600}.code-block-card pre{margin:0;padding:16px;overflow-x:auto}.code-block-card code{font-family:var(--mono);color:var(--ink);background:0 0;border:0;padding:0;font-size:12.5px}.guide-search{background:var(--paper-dim);border:1px solid var(--rule);border-radius:8px;align-items:center;gap:10px;max-width:660px;margin:24px 0 32px;padding:10px 14px;display:flex}.guide-search svg{width:15px;height:15px;color:var(--ink-soft);flex-shrink:0}.guide-search input{width:100%;color:var(--ink);background:0 0;border:0;outline:0;font:12px DM Mono,monospace}.guide-search button{color:var(--ink-soft);cursor:pointer;background:0 0;border:0;padding:0 4px;font-size:14px}section.step{border-bottom:1px solid var(--rule);padding:44px 0;scroll-margin-top:56px}section.step:first-of-type{padding-top:0}.step-num{font-family:var(--mono);color:var(--green);letter-spacing:.08em;margin:0 0 6px;font-size:13px;font-weight:700}.step h2{letter-spacing:-.01em;color:var(--ink);margin:0 0 16px;font-size:26px}.step h3.sub{font-size:14.5px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);align-items:center;gap:8px;margin:28px 0 12px;display:flex}.step h3.sub:after{content:"";background:var(--rule);flex:1;height:1px}.step-divider{background:var(--rule);border:0;height:1px;margin:28px 0}.step-markdown{color:var(--ink);max-width:680px;font-size:16px;line-height:1.75}.step-markdown p{margin:0 0 20px;line-height:1.75}.step-markdown strong,.step-markdown b,.reader.dark .step-markdown strong,.reader.dark .step-markdown b{color:var(--ink);font-weight:700}.reader.dark .step-markdown strong,.reader.dark .step-markdown b{color:#edf4eb}.step-markdown em,.step-markdown i{color:var(--ink);font-style:italic}.reader.dark .step-markdown em,.reader.dark .step-markdown i{color:#edf4eb}.step-markdown a{color:var(--green);text-underline-offset:3px;font-weight:600;text-decoration:underline;transition:color .15s}.step-markdown a:hover{color:var(--ink)}.reader.dark .step-markdown a{color:#a4dab2}.reader.dark .step-markdown a:hover{color:#edf4eb}.step-markdown code{font-family:var(--mono);background:color-mix(in srgb, var(--green) 8%, var(--paper-dim));border:1px solid var(--rule);color:var(--green);word-break:break-word;border-radius:4px;padding:2px 6px;font-size:13px}.reader.dark .step-markdown code{color:#a4dab2;background:#a4dab21f;border-color:#3b4c3e}.step-markdown del,.step-markdown s{opacity:.75;text-decoration:line-through}.takeaways-section{border-top:1px solid var(--rule);margin-top:48px;padding-top:32px}.takeaway-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:16px;display:grid}.takeaway-card{background:var(--paper-dim);border:1px solid var(--rule);border-radius:8px;padding:16px}.takeaway-card .num{font-family:var(--mono);color:var(--green);margin-bottom:8px;font-size:11px;font-weight:700;display:block}.takeaway-card p{margin:0;font-size:13.5px;line-height:1.55}.reader-footer{border-top:1px solid var(--rule);margin-top:48px;padding-top:32px}.chapter-nav-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.chapter-nav-card{background:var(--paper-dim);border:1px solid var(--rule);color:var(--ink);border-radius:8px;flex-direction:column;gap:6px;padding:16px 18px;text-decoration:none;transition:border-color .2s;display:flex}.chapter-nav-card:hover{border-color:var(--green)}.chapter-nav-card small{letter-spacing:.08em;color:var(--green);font:600 11px DM Mono,monospace}.chapter-nav-card b{font-size:13px;line-height:1.4}.chapter-nav-card.next{text-align:right;align-items:flex-end}@media (max-width:800px){.layout{grid-template-columns:1fr;padding:24px 16px 60px}nav.rail{display:none}.chapter-nav-grid{grid-template-columns:1fr}}