:root{--bg:#f3f4ef;--ink:#111716;--muted:#52605a;--line:#cfd6cf;--accent:#d65035;--yellow:#efcc53;--dark:#111716;--panel:#fff;--shadow:0 18px 48px #11171620;color-scheme:light}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow:hidden}button,a{font:inherit}button{cursor:pointer}a{color:inherit;text-underline-offset:3px}.deck{height:100vh;position:relative;width:100vw}.slide{display:none;position:absolute;inset:0;width:100vw;height:100vh;overflow-y:auto;align-content:center;gap:16px;padding:clamp(40px,5vw,72px) clamp(34px,8vw,116px) 110px}.slide.active{display:grid}.slide>*{max-width:1180px}.slide.dark{background:var(--dark);color:#f7f7ed}.slide.title{background:linear-gradient(115deg,#f3f4ef 0%,#f3f4ef 62%,#e5ebdf 62%,#e5ebdf 100%)}.slide.example{background:#e9eee8}.kicker{color:var(--accent);font-size:.9rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;margin-bottom:15px}.dark .kicker{color:var(--yellow)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(4rem,8vw,8.5rem);letter-spacing:-.075em;line-height:.94;margin-bottom:24px}h2{font-size:clamp(2.5rem,5.2vw,5.75rem);letter-spacing:-.06em;line-height:1.02;margin-bottom:22px}h2 b{color:var(--accent);font-weight:500}h1 em,h2 em{font-family:Georgia,serif;font-weight:400;letter-spacing:-.075em}h1 em{color:var(--accent)}.dark h2 em{color:var(--yellow)}h3{font-size:clamp(1.15rem,1.65vw,1.5rem);margin-bottom:9px}p,li,blockquote{font-size:clamp(1.1rem,1.75vw,1.55rem);line-height:1.4}.lede{font-size:clamp(1.45rem,2.5vw,2.4rem);line-height:1.25;max-width:950px;color:var(--muted)}.dark .lede{color:#d0d8cc}.small,.source-line{color:var(--muted);font-size:clamp(.95rem,1.15vw,1.08rem)}.dark .source-line{color:#bdc7b9}.title .lede{margin-bottom:30px}.tags{display:flex;gap:10px;flex-wrap:wrap}.tags span{border:1px solid #9baa9a;padding:9px 16px;border-radius:100px;font-weight:700}.title-mark{position:absolute;right:8vw;bottom:17vh;width:160px;height:160px;border:18px solid var(--ink);border-radius:50%;display:flex;align-items:center;justify-content:space-around;font-size:.8rem;font-weight:900;transform:rotate(-20deg)}.title-mark i{height:95px;border-left:17px solid var(--accent)}.split,.check-grid,.combine-grid,.system-grid{display:grid;gap:18px;margin-top:24px}.split{grid-template-columns:repeat(3,minmax(0,1fr))}.split:has(> :nth-child(2):last-child){grid-template-columns:repeat(2,minmax(0,1fr))}.panel,.check-grid>div,.combine-grid>div,.system-grid>div{background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:24px}.panel p,.check-grid p,.combine-grid p{color:var(--muted);font-size:clamp(1rem,1.35vw,1.25rem);margin:0}.number{display:inline-block;color:var(--accent);font-size:2.5rem;font-weight:900;margin-bottom:20px}.callout{border-left:7px solid var(--accent);background:#fff;padding:24px 28px;margin-top:25px;font-size:clamp(1.15rem,1.85vw,1.7rem);font-weight:650;max-width:1000px}.brief-strip{display:flex;flex-wrap:wrap;gap:12px;margin-top:35px}.brief-strip span{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px 20px;color:var(--muted);font-size:1rem}.brief-strip strong{display:block;color:var(--ink);font-size:1.1rem;margin-top:5px}.noun-grid{display:flex;flex-wrap:wrap;gap:12px;margin:12px 0 18px}.noun-grid span{background:#fff;border:2px solid var(--ink);border-radius:100px;padding:12px 23px;font-size:clamp(1.15rem,1.9vw,1.7rem);font-weight:700}.activity{background:#f8ecd2}.activity .kicker{color:#9e492c}ol{padding-left:1.25em;margin:6px 0 0}li+li{margin-top:10px}.equation{font-family:Georgia,serif;font-size:clamp(2rem,4vw,4rem);border-top:1px solid #5c6b63;border-bottom:1px solid #5c6b63;padding:22px 0;margin-top:20px}.equation span{color:var(--yellow);padding:0 .35em}.combine-grid,.check-grid,.system-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.combine-grid span{font-size:clamp(1.5rem,2.4vw,2.3rem);font-weight:850;letter-spacing:-.03em}.combine-grid p{margin-top:10px}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:20px}.steps div{background:#fff;padding:20px;border-radius:8px}.steps strong{display:block;color:var(--accent);font-size:2.4rem}.steps span{font-size:1.1rem}.check-grid strong{font-size:clamp(1.3rem,1.8vw,1.8rem)}.check-grid p{margin-top:8px}.yes{border-top:7px solid #42745b}.no{border-top:7px solid var(--accent)}blockquote{border-left:5px solid var(--accent);padding-left:24px;margin:28px 0 0;font-family:Georgia,serif;font-style:italic;font-size:clamp(1.45rem,2.2vw,2.2rem)}blockquote cite{display:block;font-family:Inter,system-ui,sans-serif;font-size:.9rem;font-style:normal;font-weight:700;margin-top:12px}.system-grid>div{display:grid;gap:8px}.system-grid b{color:var(--accent);font-size:1rem}.system-grid strong{font-size:clamp(1.4rem,2.2vw,2.1rem)}.system-grid span{font-size:1.1rem;color:var(--muted)}.arrow-chain{display:flex;flex-wrap:wrap;gap:15px;align-items:center;margin-top:32px}.arrow-chain span{font-size:clamp(1.25rem,2vw,2rem);font-weight:800;padding:13px 18px;border:1px solid var(--line);background:#fff;border-radius:6px}.arrow-chain b{color:var(--accent);font-size:2rem}.deliverables{columns:2;column-gap:70px}.deliverables li{break-inside:avoid}.question-stack p{border-bottom:1px solid #a7b4aa;padding:11px 0;margin:0;font-size:clamp(1.3rem,2.3vw,2.2rem)}.sources ul{list-style:none;padding:0;max-width:1050px}.sources li{padding:15px 0;border-bottom:1px solid var(--line);font-size:1.2rem}.sources li a{font-weight:750}.sources li span{display:block;color:var(--muted);font-size:1rem;margin-top:5px}.controls{position:fixed;z-index:10;bottom:25px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:5px;background:#111716f0;color:#fff;border:1px solid #ffffff26;border-radius:15px;box-shadow:var(--shadow);padding:8px;max-width:calc(100vw - 20px)}.icon-button,.text-button{height:42px;border:0;border-radius:8px;background:transparent;color:inherit}.icon-button{min-width:42px;font-size:1.6rem;line-height:1}.text-button{padding:0 13px;font-size:.9rem;font-weight:650}.icon-button:hover,.text-button:hover,.text-button[aria-pressed=true]{background:#ffffff28}.icon-button:disabled{opacity:.35;cursor:default}.status{min-width:180px;display:flex;justify-content:space-between;gap:12px;align-items:center;padding:0 12px;font-size:.85rem}.status span{color:#b9c7b8}.progress{height:5px;position:fixed;z-index:9;bottom:0;left:0;right:0;background:#d2d9ce}.progress span{display:block;height:100%;background:var(--accent);transition:width .2s}.show-controls{display:none;position:fixed;z-index:11;bottom:14px;left:50%;transform:translateX(-50%);border:0;background:var(--dark);color:#fff;border-radius:9px;padding:6px 20px;font-size:1.3rem}.controls-collapsed .controls{display:none}.controls-collapsed .show-controls{display:block}.note-box{display:none;background:#fff7de;color:var(--ink);border:1px solid #dfc47a;border-radius:8px;padding:15px 18px;margin-top:10px;max-width:950px}.note-box strong{font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:#8a5a24}.note-box p{font-size:1rem;margin:7px 0 0}.show-notes .slide.active .note-box{display:block}.show-notes .slide.active{align-content:start}dialog{border:0;border-radius:14px;width:min(1000px,92vw);max-height:88vh;padding:25px;background:var(--bg);box-shadow:0 25px 80px #0007}dialog::backdrop{background:#111716bb}.dialog-head{display:flex;justify-content:space-between;align-items:center}.dialog-head h2{font-size:2rem;margin:0}.dialog-head button{color:var(--ink)}.overview-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:20px}.overview-group{background:#fff;border:1px solid var(--line);border-radius:8px;padding:15px}.overview-group h3{font-size:1rem;color:var(--accent);margin:0 0 10px}.overview-group button{display:block;width:100%;background:transparent;border:0;border-radius:5px;text-align:left;padding:8px;font-size:.95rem}.overview-group button:hover,.overview-group button[aria-current=true]{background:#e5ece5}.overview-group small{color:var(--muted);margin-right:8px}
@media(max-width:850px){body{overflow:auto}.slide{padding:35px 24px 110px;min-height:100vh;height:auto}.split,.split:has(> :nth-child(2):last-child),.combine-grid,.check-grid,.system-grid{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.title-mark{display:none}.deliverables{columns:1}.controls{bottom:10px;overflow-x:auto;width:max-content}.status{min-width:140px}.text-button{padding:0 8px}.overview-grid{grid-template-columns:1fr 1fr}}
@media(max-width:550px){h1{font-size:clamp(3.2rem,14vw,5rem)}h2{font-size:clamp(2.25rem,10vw,3.5rem)}.steps,.overview-grid{grid-template-columns:1fr}.controls{left:10px;right:10px;width:auto;transform:none}.status{min-width:105px}.status strong{max-width:75px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.text-button{font-size:.78rem}.brief-strip span{flex:1 1 100%}}
@media print{@page{size:landscape;margin:0}html,body,.deck{height:auto;width:auto;overflow:visible}.slide,.slide.active{position:static;display:grid!important;width:100vw;height:100vh;min-height:100vh;overflow:hidden;page-break-after:always;break-after:page;padding:6vh 7vw 8vh}.slide.dark{-webkit-print-color-adjust:exact;print-color-adjust:exact}.controls,.show-controls,.progress,dialog,.note-box{display:none!important}}