.ebl{--bg:#0a1128;--bg-2:#111a38;--bg-3:#0e1730;--ink:#f5f7fa;--ink-2:#9ca3af;--ink-3:#8a93a6;--line:#1e2a4a;--accent:#1a73e8;--accent-2:#4a90f0;--accent-ink:#6ea8ff;--accent-soft:#1a73e824;--cta:#2ee59d;--cta-2:#5cf2b8;--cta-text:#0a1128;--good:#2ee59d;--good-soft:#2ee59d1f;--bad:#f08573;--bad-soft:#f085731f;--node:#15224a;--shadow:0 1px 2px #02061773, 0 8px 24px #02061766;--shadow-lg:0 2px 4px #02061780, 0 20px 50px #02061799;--radius:14px;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}.ebl[data-theme=light]{--bg:#f5f7fa;--bg-2:#fff;--bg-3:#eaeff6;--ink:#0a1128;--ink-2:#3d4a63;--ink-3:#66738c;--line:#d8e0ec;--accent:#1a73e8;--accent-2:#1765cc;--accent-ink:#1a73e8;--accent-soft:#e3edfb;--cta:#2ee59d;--cta-2:#4ff0b0;--cta-text:#0a1128;--good:#177a50;--good-soft:#dff5eb;--bad:#b3372a;--bad-soft:#f9e6e3;--node:#fff;--shadow:0 1px 2px #0a11280f, 0 8px 24px 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var(--line);display:none;position:fixed;bottom:0;left:0;right:0}.ebl .sticky-cta .btn{width:100%}@media (max-width:640px){.ebl .sticky-cta.show{display:block}.ebl{padding-bottom:76px}}.ebl .ch1-card{border:1px solid var(--line);background:var(--bg-2);box-shadow:var(--shadow-lg);text-align:center;border-radius:18px;max-width:820px;margin:0 auto;padding:38px 30px}.ebl .ch1-card>h2{margin-bottom:8px}.ebl .ch1-card .ch1-sub{color:var(--ink-2);margin-bottom:24px;font-size:16px}.ebl .btn-ghost{color:var(--accent-ink);border:1px solid var(--accent);cursor:pointer;background:0 0;border-radius:12px;justify-content:center;align-items:center;gap:10px;padding:13px 26px;font-size:15px;font-weight:700;transition:background .15s,transform .15s;display:inline-flex}.ebl .btn-ghost:hover{background:var(--accent-soft);transform:translateY(-2px)}.ebl .btn-ghost:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.ebl .ch1-body{text-align:left;margin-top:38px;display:none}.ebl .ch1-body.open{display:block}.ebl .chapter{max-width:680px;margin:0 auto;font-size:16.5px;line-height:1.7}.ebl .chapter p{margin:0 0 1.3em}.ebl .chapter .ch-no{letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);margin-bottom:8px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;display:block}.ebl .chapter h3{margin:0 0 14px;font-size:clamp(24px,3.4vw,32px)}.ebl .chapter .ch-lede{color:var(--ink-2);margin-bottom:1.6em;font-style:italic}.ebl .chapter hr{border:none;border-top:1px solid var(--line);margin:2em 0}.ebl .chapter h4{color:#2ee59d;margin:2.1em 0 .8em;font-size:19px;line-height:1.35}.ebl[data-theme=light] .chapter h4{color:#0e9b63}.ebl .chapter blockquote{color:#1a73e8;border-left:3px solid #1a73e8;margin:1.8em 0;padding-left:18px;font-size:19px;font-style:italic;font-weight:600;line-height:1.55}.ebl .ch1-close{border:1px solid var(--line);background:var(--bg-3);text-align:center;border-radius:14px;max-width:680px;margin:2.6em auto 0;padding:28px 24px}.ebl .ch1-close h3{margin-bottom:16px;font-size:19px}.ebl .ch1-toc{flex-wrap:wrap;justify-content:center;gap:8px;margin:0 0 22px;padding:0;list-style:none;display:flex}.ebl .ch1-toc li{border:1px solid var(--line);background:var(--bg-2);color:var(--ink-2);border-radius:999px;padding:6px 12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px}.ebl .reveal{opacity:0;transition:opacity .6s,transform .6s;transform:translateY(22px)}.ebl .reveal.in{opacity:1;transform:none}@media (prefers-reduced-motion:reduce){.ebl .reveal{opacity:1;transition:none;transform:none}.ebl .btn,.ebl .b-card,.ebl .cover-frame img{transition:none}}