:root{color-scheme:dark;--bg:#090c0b;--surface:#101612;--ink:#efeee7;--muted:#a2aaa3;--dim:#7e8b81;--line:#29332c;--accent:#b0dbbe;--accent-dark:#1e3829;--gold:#d9be8c;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;-webkit-font-smoothing:antialiased}body{overscroll-behavior-x:none}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:disabled{opacity:.28;cursor:default}a{color:var(--accent);text-underline-offset:4px}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button{touch-action:manipulation}h1,h2,h3,p{margin:0}button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.4}.reader{max-width:1600px;margin:auto;height:100svh;min-height:620px;display:flex;flex-direction:column;padding:0 max(36px,env(safe-area-inset-right)) 0 max(36px,env(safe-area-inset-left))}.masthead{height:90px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-size:12px;letter-spacing:.18em;text-decoration:none;font-weight:650}.brand svg{width:27px;height:27px;fill:none;stroke:var(--accent);stroke-width:1.3}.edition{font-size:10px;letter-spacing:.18em;color:var(--dim)}.text-button{border:0;background:none;min-height:44px;padding:0;display:flex;align-items:center;gap:9px;color:var(--muted);font-size:12px}.text-button:hover{color:var(--ink)}.bookline{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:60px;color:var(--dim);font-size:10px;letter-spacing:.12em;flex-shrink:0}.bookline i{font-style:normal;margin:0 12px;color:#4c5d50}#reading-time{letter-spacing:.03em}#stage{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:var(--line) transparent;touch-action:pan-y;display:flex}#stage:focus{outline:0}#slide{width:100%;display:flex;flex-direction:column;margin:auto 0;padding:24px 36px 30px;animation:arrive .28s ease-out}.slide-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(35px,5vw,90px);align-items:center}.slide-copy{max-width:600px}.eyebrow{font-size:10px;line-height:1.5;letter-spacing:.17em;font-weight:550;color:var(--accent);text-transform:uppercase;display:block}.slide-number{color:var(--dim);margin-right:10px;font-variant-numeric:tabular-nums}.slide-title{font-size:clamp(32px,3.4vw,54px);font-weight:440;letter-spacing:-.045em;line-height:1.1;margin:22px 0}.slide-title:focus{outline:0}.slide-intro{font-size:clamp(16px,1.35vw,20px);line-height:1.6;color:#c6cdc7;max-width:580px}.slide-body{font-size:15px;line-height:1.7;color:var(--muted);margin-top:19px;max-width:580px}.slide-note{font-size:11px;line-height:1.6;color:var(--dim);margin-top:22px}.takeaway{margin-top:38px;border-top:1px solid var(--line);padding-top:18px;display:flex;gap:20px;align-items:baseline;line-height:1.6;color:#b8c4ba;font-size:13px}.takeaway span{white-space:nowrap;font-size:9px;letter-spacing:.14em;color:var(--dim)}.visual{min-width:0}.visual-label{font-size:9px;letter-spacing:.15em;text-transform:uppercase;color:var(--dim);margin-bottom:21px;display:flex;align-items:center;gap:12px}.visual-label:after{content:"";height:1px;background:var(--line);flex:1}.visual-headline{font-size:22px;line-height:1.35;font-weight:450;letter-spacing:-.02em;margin-bottom:22px}.concept-list{display:flex;flex-direction:column;gap:0}.concept-item{display:flex;gap:20px;padding:19px 0;border-top:1px solid var(--line)}.concept-item:last-child{padding-bottom:0}.concept-index{font-family:ui-monospace,monospace;font-size:10px;color:var(--dim);padding-top:4px}.concept-item h3{font-size:16px;font-weight:500;color:var(--accent);line-height:1.4;margin-bottom:6px}.concept-item p{font-size:14px;color:var(--muted);line-height:1.6}.comparison{display:flex;flex-direction:column;gap:14px}.comparison-block{border:1px solid var(--line);padding:22px 25px;border-radius:3px;background:#0d110f;position:relative}.comparison-block:last-child{border-color:#42604b;background:#101b14}.comparison-block .eyebrow{font-size:9px;margin-bottom:12px;color:var(--dim)}.comparison-block:last-child .eyebrow{color:var(--accent)}.comparison-block p{font-size:17px;line-height:1.6;color:#c7cec9}.comparison-block:last-child p{color:var(--ink)}.pyramid-stack{display:flex;flex-direction:column;align-items:center;gap:0}.pyramid-apex{padding:22px 28px;border:1px solid #5d8769;background:#14251a;text-align:center;width:88%;font-size:20px;line-height:1.4;color:var(--accent);border-radius:3px}.pyramid-connector{width:66%;height:35px;border:1px solid #405e48;border-bottom:0;position:relative;margin-top:30px}.pyramid-connector:before{content:"";position:absolute;left:50%;top:-31px;width:1px;height:30px;background:#405e48}.pyramid-branches{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;width:100%}.pyramid-branch{border:1px solid var(--line);padding:16px 12px;text-align:center;border-radius:3px;background:var(--surface)}.pyramid-branch h3{font-size:13px;font-weight:500;line-height:1.4;color:var(--accent)}.pyramid-branch p{font-size:12px;line-height:1.5;margin-top:8px;color:var(--muted)}.pyramid-bottom{margin:24px 0 0;text-align:center;font-size:10px;letter-spacing:.09em;color:var(--dim)}.cover .slide-title{font-size:clamp(54px,5.5vw,86px);max-width:620px;font-weight:420;line-height:1.02}.cover .slide-intro{font-size:19px;max-width:510px}.cover .slide-body{max-width:490px}.cover-visual{min-height:340px;position:relative;display:flex;align-items:center;justify-content:center}.cover-visual svg{width:100%;max-height:410px;overflow:visible}.cover .takeaway{border-top:0;margin-top:30px;padding-top:0}.cover .takeaway span{color:var(--accent)}.cover-caption{font-size:10px;color:var(--dim);letter-spacing:.15em;text-align:center;margin-top:10px}.cover-start{margin-top:28px;background:var(--accent);color:#102016;border:1px solid var(--accent);padding:13px 20px;min-height:48px;border-radius:3px;font-size:13px;display:inline-flex;gap:35px;align-items:center}.cover-start:hover{background:#c9ebd3}.exercise-prompt{font-size:18px;line-height:1.5;margin-bottom:18px;color:var(--ink)}.exercise-options{display:flex;flex-direction:column;gap:10px}.exercise-option{background:#101612;border:1px solid #344339;border-radius:3px;text-align:left;padding:15px 17px;font-size:14px;line-height:1.5;display:flex;gap:14px;align-items:baseline;min-height:48px}.exercise-option>span{color:var(--dim);font-size:10px;font-family:ui-monospace,monospace}.exercise-option:hover{border-color:var(--accent)}.exercise-option[data-selected=true]{border-color:var(--gold);background:#241f15}.exercise-option[data-correct=true]{border-color:var(--accent);background:#14251a}.exercise-feedback{margin-top:18px;font-size:14px;line-height:1.65;color:var(--muted);border-left:2px solid var(--accent);padding-left:17px}.exercise-feedback strong{font-weight:550;display:block;margin-bottom:5px;color:var(--accent)}.question-visual{border-left:1px solid #567661;padding:12px 0 12px 30px}.question-visual .visual-headline{font-size:30px;font-weight:400;line-height:1.35;color:var(--accent)}.check-item{display:flex;gap:16px;padding:16px 0;border-top:1px solid var(--line)}.check-item>span{color:var(--accent);font-size:17px}.check-item h3{font-size:15px;font-weight:500;margin-bottom:5px}.check-item p{color:var(--muted);font-size:13px;line-height:1.6}.closing .slide-title{font-size:clamp(36px,4.2vw,64px)}.navigation{flex-shrink:0;padding-top:10px;padding-bottom:max(14px,env(safe-area-inset-bottom))}.chapter-progress{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}.chapter-button{position:relative;text-align:left;border:0;border-top:2px solid #263229;background:transparent;padding:13px 0 9px;color:var(--dim);font-size:10px;letter-spacing:.035em;min-height:44px}.chapter-button .chapter-fill{position:absolute;left:0;top:-2px;height:2px;background:var(--accent)}.chapter-button[aria-current=true]{color:var(--accent)}.chapter-button .chapter-index{margin-right:8px;font-size:9px;font-family:ui-monospace,monospace}.navigation-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:13px}.navigation-hint{color:var(--dim);font-size:10px;letter-spacing:.02em}kbd{font:inherit;border:1px solid var(--line);border-radius:3px;padding:3px 5px}.page-controls{display:flex;align-items:center;gap:9px}#page-count{font-size:12px;font-variant-numeric:tabular-nums;color:var(--dim);margin-right:14px;min-width:46px}#page-count strong{color:var(--ink);font-weight:450}.arrow-button{min-width:44px;height:44px;border:1px solid #354239;border-radius:50%;background:transparent;font-size:20px;font-weight:300;color:var(--muted);display:grid;place-items:center}.arrow-button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.arrow-button.primary{background:var(--accent);color:#122518;border-color:var(--accent)}.arrow-button.primary:hover:not(:disabled){background:#c9ebd3;color:#122518}.skip-link{position:fixed;top:-80px;left:20px;padding:12px;background:var(--accent);color:var(--bg);z-index:20}.skip-link:focus{top:10px}dialog{background:#101612;color:var(--ink);border:1px solid #3a4c3f;border-radius:8px;width:min(740px,calc(100% - 28px));max-height:85svh;padding:30px;box-shadow:0 24px 100px #0008}dialog::backdrop{background:#000b;backdrop-filter:blur(6px)}.dialog-header{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:22px}.dialog-header h2{font-size:30px;font-weight:450;letter-spacing:-.03em;margin-top:8px}.dialog-copy{font-size:14px;line-height:1.7;color:var(--muted);margin-bottom:20px}.toc-section{margin:26px 0 10px;color:var(--accent);font-size:10px;letter-spacing:.15em;text-transform:uppercase}.toc-item{display:flex;gap:18px;align-items:center;border:0;border-bottom:1px solid var(--line);padding:13px 10px;min-height:48px;background:none;color:var(--muted);text-align:left;width:100%;font-size:14px;line-height:1.5}.toc-item span{color:var(--dim);font-size:10px;font-variant-numeric:tabular-nums}.toc-item:hover,.toc-item[aria-current=true]{background:#1d2b20;color:var(--ink)}.source-entry{padding:20px 0;border-top:1px solid var(--line)}.source-entry h3{font-size:16px;font-weight:500;line-height:1.5}.source-entry p{font-size:13px;line-height:1.7;color:var(--muted);margin-top:8px}.source-entry .source-author{font-size:10px;color:var(--accent);letter-spacing:.06em;margin-bottom:7px}.source-tabs{display:flex;gap:20px;flex-wrap:wrap}.source-tabs button{border:0;border-bottom:1px solid transparent;background:none;padding:10px 0;color:var(--muted);font-size:12px;min-height:44px}.source-tabs button[aria-pressed=true]{border-color:var(--accent);color:var(--accent)}.restart{margin-top:24px;border:1px solid var(--line);padding:12px 18px;min-height:44px;background:none;border-radius:3px;font-size:12px}.resume-link{display:block;margin-top:16px;color:var(--accent);border:0;background:none;padding:8px 0;font-size:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes arrive{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1600px){.reader{padding-left:60px;padding-right:60px}}@media(max-width:1100px){.reader{padding-left:28px;padding-right:28px}#slide{padding-left:8px;padding-right:8px}.slide-layout{gap:35px}.slide-title{font-size:38px}.cover .slide-title{font-size:62px}.slide-intro{font-size:17px}.slide-body{font-size:14px}.pyramid-branches{gap:6px}.pyramid-branch{padding:14px 9px}}
@media(max-width:740px){.reader{padding-left:22px;padding-right:22px;min-height:500px}.masthead{height:68px}.brand{font-size:10px;letter-spacing:.14em;gap:9px}.brand svg{width:23px;height:23px}.edition{display:none}.bookline{min-height:47px;font-size:8px;gap:6px;letter-spacing:.08em}.bookline i{margin:0 7px}#reading-time{font-size:8px;letter-spacing:0}.text-button{font-size:11px}.slide-layout{grid-template-columns:1fr;gap:30px;align-items:start}#slide{padding:16px 0 26px;margin:0}.slide-title{font-size:38px;line-height:1.1;margin:17px 0}.slide-intro{font-size:16px;line-height:1.6}.slide-body{font-size:14px;margin-top:15px;line-height:1.65}.slide-note{margin-top:15px}.eyebrow{font-size:9px}.visual-label{margin-bottom:16px}.visual-headline{font-size:21px}.concept-item{padding:14px 0;gap:15px}.concept-item p{font-size:13px}.concept-item h3{font-size:15px}.takeaway{margin-top:26px;padding-top:16px;gap:10px;flex-direction:column;font-size:12px}.cover .slide-title{font-size:56px;margin-top:20px;max-width:450px}.cover .slide-intro{font-size:17px}.cover .slide-body{font-size:14px}.cover .slide-layout{gap:16px}.cover-visual{min-height:0;height:210px}.cover-visual svg{height:210px;width:auto;max-width:100%}.cover-caption{font-size:8px;margin-top:2px}.cover-start{margin-top:20px}.cover .takeaway{margin-top:20px}.navigation{padding-top:0;padding-bottom:max(12px,env(safe-area-inset-bottom))}.chapter-button{font-size:8px;line-height:1.4;letter-spacing:0;padding:10px 0 4px;min-height:38px}.chapter-button .chapter-index{display:none}.navigation-row{padding-top:7px;gap:8px}.navigation-hint{display:none}.source-button{font-size:10px;gap:7px}.source-button svg{width:16px}.page-controls{gap:7px}#page-count{font-size:11px;margin-right:5px}.arrow-button{min-width:42px;height:42px}.comparison-block{padding:19px}.comparison-block p{font-size:15px}.pyramid-apex{font-size:18px;padding:18px}.pyramid-branch p{font-size:11px}.pyramid-branch h3{font-size:12px}.exercise-option{font-size:13px;padding:13px 14px}.exercise-prompt{font-size:16px}.question-visual{padding-left:20px}.question-visual .visual-headline{font-size:25px}dialog{padding:22px;max-height:90svh}.dialog-header h2{font-size:25px}.closing .slide-title{font-size:42px}}
@media(max-width:370px){.reader{padding-left:16px;padding-right:16px}.bookline{font-size:7px}.slide-title{font-size:34px}.cover .slide-title{font-size:48px}.source-button{font-size:9px}.page-controls{gap:5px}#page-count{font-size:10px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;scroll-behavior:auto!important}}
@media print{html,body{background:#fff;color:#111}.reader{height:auto;min-height:0}.masthead,.bookline,.navigation,dialog,.cover-start,.resume-link{display:none}#stage{overflow:visible;display:block}#slide{padding:20px}.slide-layout{display:block}.visual{margin-top:25px}*{color:#111!important;border-color:#999!important;background:transparent!important}.slide-title{font-size:32px}.slide-intro,.slide-body{font-size:12px}.takeaway{font-size:11px}}
/* Compact opening keeps the full visual within a typical phone viewport. */
@media(max-width:740px){.cover .slide-title{font-size:48px}.cover .slide-body{font-size:13px;line-height:1.6}.cover-visual,.cover-visual svg{height:135px}.cover .takeaway{margin-top:12px;gap:4px}.cover .slide-layout{gap:10px}.cover-start{margin-top:16px}.cover .slide-intro{font-size:16px}}