:root{--brand-navy: #1a1b3a;--brand-navy-soft: #2a2c56;--brand-violet: #6d28d9;--brand-violet-light: #8b5cf6;--brand-lavender: #ede9fe;--brand-lavender-mid: #c4b5fd;--brand-paper: #faf9fc;--brand-ink-soft: #5b5c7a;--brand-line: #e4e1f0;--brand-gradient: linear-gradient(135deg, #8b5cf6 0%, #312e81 100%);--navy-900: #0c0d1c;--navy-800: #101228;--navy-700: #14152e;--bg: var(--navy-900);--bg-elevated: var(--navy-800);--surface: var(--navy-700);--surface-raised: var(--brand-navy);--surface-high: var(--brand-navy-soft);--text: #f4f3fb;--text-muted: #a5a3c4;--text-faint: #8a88ad;--accent: var(--brand-violet-light);--accent-strong: var(--brand-violet);--accent-soft: var(--brand-lavender-mid);--accent-wash: rgba(139, 92, 246, .12);--accent-wash-strong: rgba(139, 92, 246, .22);--line: rgba(196, 181, 253, .14);--line-strong: rgba(196, 181, 253, .28);--ok: #4ade80;--warn: #fbbf24;--risk: #fb7185;--shadow-lift: 0 24px 64px -20px rgba(0, 0, 0, .75);--shadow-glow: 0 0 48px -8px rgba(139, 92, 246, 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a{display:flex;align-items:center;gap:.85rem}.spine-dot{position:relative;z-index:1;width:12px;height:12px;flex:none;border-radius:50%;background:var(--bg);border:2px solid var(--line-strong);transition:border-color var(--dur) var(--ease-out-expo),background-color var(--dur) var(--ease-out-expo),transform var(--dur) var(--ease-out-expo)}.spine-label{position:absolute;left:1.65rem;top:50%;margin-top:-.55em;font-family:var(--font-mono);font-size:.7rem;line-height:1.1;letter-spacing:.11em;text-transform:uppercase;white-space:nowrap;color:var(--text-faint);opacity:0;transform:translate(-6px);transition:opacity var(--dur) var(--ease-out-expo),transform var(--dur) var(--ease-out-expo),color var(--dur) var(--ease-out-expo)}.spine:hover .spine-label,.spine-node.is-active .spine-label,.spine-node a:focus-visible .spine-label{opacity:1;transform:translate(0)}.spine-node.is-done .spine-dot{background:var(--accent);border-color:var(--accent)}.spine-node.is-active 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.arith-bar{background:linear-gradient(180deg,var(--brand-violet-light),var(--brand-violet))}.arith-note{font-size:.78rem}.consequences ul{display:grid;gap:1rem;max-width:62ch}@media(min-width:900px){.consequences ul{grid-template-columns:repeat(3,1fr);gap:2rem;max-width:none}}.consequences li{position:relative;padding-left:1.4rem;color:var(--text-muted);line-height:1.62}.consequences li:before{content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;border-radius:50%;border:1.5px solid var(--risk)}.consequences strong{color:var(--text);font-weight:600}.split{display:grid;gap:clamp(2.5rem,1rem + 5vw,4.5rem);align-items:start}.split-steps{display:flex;flex-direction:column;gap:clamp(3rem,2rem + 6vw,8rem)}.step{display:flex;flex-direction:column;gap:.85rem;align-items:flex-start;opacity:.42;transition:opacity var(--dur-slow) var(--ease-out-expo)}.step.is-active{opacity:1}.step-n{color:var(--accent);font-size:.75rem;letter-spacing:.14em}.step .muted{max-width:44ch}.split-sticky{position:sticky;top:calc(var(--nav-h) + 3rem)}.deck{padding:0;overflow:hidden;box-shadow:var(--shadow-lift)}.deck-head,.deck-foot{display:flex;align-items:center;gap:.75rem;padding:.85rem 1.1rem;background:var(--bg-elevated)}.deck-head{border-bottom:1px solid var(--line)}.deck-foot{border-top:1px solid var(--line)}.deck-head .mono{font-size:.74rem}.deck-live{margin-inline-start:auto;display:inline-flex;align-items:center;gap:.4rem;font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}.deck-live i{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse 2s var(--ease-in-out-quart) infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.8)}}.deck-slide{width:100%;height:auto;background:var(--surface);padding:.5rem}.deck-region rect{fill:var(--text-faint);opacity:.28;transition:fill var(--dur-slow) var(--ease-out-expo),opacity var(--dur-slow) 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