:root{--paper:#f7f5f0;--white:#fffefa;--ink:#303b35;--muted:#70786d;--pine:#526b62;--line:#dddcd1;--gold:#cba766;font-family:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Segoe UI',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(ellipse at 12% 0%,#dce6da66,transparent 36rem),radial-gradient(ellipse at 100% 30%,#eee0c755,transparent 32rem);-webkit-font-smoothing:antialiased}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit}a{color:inherit}button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid #9eb7ab;outline-offset:5px}button{cursor:pointer}.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.topbar{width:min(980px,calc(100% - 40px));margin:auto;padding:24px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-link{display:inline-flex;align-items:center;gap:11px;text-decoration:none;font-weight:720;letter-spacing:-.02em}.brand-mark{width:36px;height:36px;display:grid;place-items:center;background:#e8ecdf;border-radius:49% 51% 46% 54%;transform:rotate(-5deg)}.brand-mark img{width:31px;height:31px;transform:rotate(5deg)}.brand-version{font-size:10px;font-weight:400;color:var(--muted);margin-left:4px}.home{display:flex;align-items:center;gap:7px;text-decoration:none;color:var(--muted);font-size:13px}.home:hover{color:var(--pine)}.home .icon{width:16px}
.shell{width:min(980px,calc(100% - 40px));margin:auto;padding:12px 0 0}.hero{text-align:center;max-width:760px;margin:0 auto 24px;position:relative}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border:1px solid #526b622e;border-radius:999px;background:#fffefa88;color:var(--pine);font-size:11px;letter-spacing:.13em}.eyebrow .icon{width:15px;height:15px}h1{font-size:clamp(17px,4.2vw,40px);white-space:nowrap;letter-spacing:-.045em;line-height:1.3;margin:20px 0 12px;font-weight:730}.hero-copy{font-size:17px;line-height:1.9;color:var(--muted);margin:0}.hero-star{position:absolute;right:8px;top:8px;color:var(--gold);transform:rotate(12deg);width:35px;height:35px}
.layout{display:grid;grid-template-columns:minmax(330px,.95fr) minmax(0,1fr);gap:22px;align-items:start}.panel{border:1px solid #6370682e;border-radius:24px;background:var(--white);box-shadow:0 16px 52px #2d393209}.mapPanel{position:sticky;top:24px;padding:24px 18px 18px;background:linear-gradient(150deg,#fffefb,#f9f8ee)}.mapheading{display:flex;align-items:flex-start;gap:8px;padding:0 6px}.mapheading .icon{margin-top:3px}.mapheading .icon{color:var(--gold)}.maptitle{font-size:16px;font-weight:650;letter-spacing:.02em;line-height:1.6;margin:0;overflow-wrap:anywhere}.mapdesc{font-size:12px;color:#b2b8ac;line-height:1.8;margin:8px 6px 0;text-align:right}.atlas{display:block;width:100%;height:auto;margin:16px 0 0;overflow:visible}.node{cursor:pointer;outline:none}.node text{pointer-events:none}.node .ring{transition:stroke-width .2s,fill-opacity .2s}.node:hover .ring,.node:focus-visible .ring{stroke-width:3}.node:focus-visible .ring{stroke:var(--ink)}.legend{display:flex;justify-content:center;gap:13px;font-size:10px;color:var(--muted);border-top:1px dashed var(--line);padding-top:16px;margin-top:14px}.dot{display:inline-block;width:7px;height:7px;border-radius:48% 52% 42% 58%;margin-right:4px}.content{padding:28px 30px 22px;touch-action:pan-y;scroll-margin-top:24px}.chapterline{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.kicker{font-size:10px;letter-spacing:.16em;color:var(--pine);font-weight:650}.domain{font-size:10px;color:#8a795c;background:#f3efdf;border-radius:999px;padding:5px 9px}.title{font-size:30px;line-height:1.35;letter-spacing:-.035em;margin:13px 0 10px}.idea{font-size:16px;line-height:1.8;margin:0 0 22px;color:#536357}.art{position:relative;border-top:1px solid #e6e5d9;padding-top:17px}.smallhead{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.04em;margin:23px 0 9px}.smallhead .icon{width:15px;height:15px}.modelhead{margin:0;color:#758367}.art svg{display:block;width:100%;height:205px;margin:3px 0 7px}.bodytext{font-size:14px;line-height:1.95;margin:0}.example{padding:13px 16px;background:#f3f4ec;border-radius:3px 13px 12px 14px;border-left:2px solid #c6d1b8}.thought{display:flex;align-items:flex-start;gap:9px;border-top:1px dashed var(--line);margin-top:22px;padding-top:17px;font-size:14px;line-height:1.9;color:#776a50}.thought .icon{color:#b59a65;margin-top:3px;width:18px}.foot{margin-top:24px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px}#prev{grid-column:1;grid-row:1;justify-self:start}#count{grid-column:2;grid-row:1}#next{grid-column:3;grid-row:1;justify-self:end}.button[hidden]{display:none}.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid #d8ddd3;background:transparent;border-radius:999px;padding:10px 14px;font-size:12px;min-height:40px}.button:hover{background:#edf0e7;border-color:#b8c5b5}.button .icon{width:15px;height:15px}.next{background:var(--pine);color:var(--white);border-color:var(--pine)}.next:hover{background:#3f554d;color:var(--white);border-color:#3f554d}.counter{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.mobile-map{display:none}.mapback{display:none}.maphead{display:flex;align-items:center;justify-content:space-between;gap:10px}.maphead .button{padding:8px;min-height:36px;flex-shrink:0}.footer{max-width:760px;margin:30px auto 0;padding:0 0 28px;text-align:center;font-size:10px;color:#8c9286;line-height:1.9}.footer p{margin:0}.footer .signature{margin-top:10px;letter-spacing:.04em}.fade{animation:appear .22s ease}@keyframes appear{from{opacity:.5;transform:translateY(4px)}to{opacity:1;transform:none}}
@media(max-width:760px){.topbar{padding:20px 0}.shell{padding-top:6px}.hero{margin-bottom:22px}.hero-copy{font-size:15px}.hero-star{right:0;top:13px;width:23px}.layout{grid-template-columns:1fr}.mapPanel{display:none}.mobile-map{display:inline-flex;white-space:nowrap;padding:8px 12px;font-size:11px}.content{padding:23px 21px 20px;border-radius:22px}.title{font-size:28px}.idea{font-size:15px}.art svg{height:198px}.mapback.show{display:flex;position:fixed;inset:0;z-index:10;background:#303b3555;padding:12px;overflow:auto;align-items:safe center;justify-content:center;backdrop-filter:blur(5px)}.mapback .panel{width:100%;max-width:400px;padding:22px;max-height:calc(100dvh - 40px);overflow:auto}.mapback .atlas{max-height:55dvh}.footer{padding-bottom:22px}.brand-version{display:none}h1{margin-top:18px}}
@media(max-width:360px){.topbar,.shell{width:calc(100% - 28px)}.content{padding:20px 16px}.button{padding:9px 11px}.hero-copy{font-size:14px}.hero-star{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.book-search{position:relative;max-width:420px;margin:18px auto 0;text-align:left;z-index:2}
#search-form{display:flex;align-items:center;gap:10px;padding:6px 7px 6px 16px;background:var(--white);border:1px solid #6370683d;border-radius:999px;box-shadow:0 5px 18px #2d393206}
#search-form:focus-within{border-color:var(--pine);box-shadow:0 0 0 3px #526b6212}
#search-form>.icon{width:18px;height:18px;color:var(--muted)}
#book-query{min-width:0;width:100%;flex:1;border:0;background:transparent;color:var(--ink);font:inherit;font-size:13px;outline:none;line-height:1.6}
#book-query::placeholder{color:#8c9286}.search-submit{border:0;border-radius:999px;background:var(--pine);color:var(--white);font-size:12px;padding:10px 17px;min-height:40px;flex-shrink:0}.search-submit:hover{background:#3f554d}

.book-results{position:absolute;top:54px;left:0;right:0;background:var(--white);border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:0 14px 36px #2d39321a}
.book-results[hidden]{display:none}.search-status{font-size:12px;line-height:1.8;color:var(--muted);margin:0 4px 7px}.book-results ul{list-style:none;padding:0;margin:0;max-height:280px;overflow:auto}.book-result{display:flex;flex-direction:column;gap:7px;width:100%;padding:14px 10px;border:0;border-radius:10px;background:transparent;text-align:left}.book-result:hover,.book-result:focus-visible{background:#edf0e7}.book-result:focus-visible{outline-offset:-3px}.book-result strong{font-size:13px;line-height:1.6;font-weight:600}.book-result span{font-size:11px;color:var(--muted);line-height:1.7}
/* iOS Safari zooms the whole page when a focused field is under 16px. */
@media(max-width:760px),(pointer:coarse){#book-query{font-size:16px}}
@media(max-width:760px){.book-search{width:calc(100% - 16px)}.book-results{top:56px;padding:10px}.book-results ul{max-height:min(280px,45dvh);overscroll-behavior:contain}.book-result{min-height:56px}}
@media(max-width:360px){#search-form{gap:6px;padding-left:12px}.search-submit{padding:10px 12px}}

@media(max-width:760px){.chapterline{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 10px}.kicker{grid-column:1;grid-row:1}.domain{grid-column:1;grid-row:2;justify-self:start}.mobile-map{grid-column:2;grid-row:1 / span 2;max-width:180px;white-space:normal;text-align:left}.art svg{height:auto;aspect-ratio:326 / 195;margin:10px 0 12px}.art svg text{font-size:16px}.art svg .model-detail{font-size:14px}}

/* The book map is an illustrated place to explore, with live stops above it. */
@media(min-width:1000px){.layout{grid-template-columns:440px minmax(0,1fr)}}
.mapPanel{padding:24px 16px 18px;background:#fffdf6;overflow:hidden}
.journey-map{margin:8px 0 0;overflow:visible}
.node:focus-visible .map-stop-line{opacity:1;stroke:#526b62;stroke-width:3}
.node:hover .map-stop-line{opacity:1}
.map-stop rect{pointer-events:all}
.map-stop>path,.map-stop>ellipse,.map-stop>g{pointer-events:none}
.mapPanel .mapdesc{text-align:right;margin-top:6px}

.mapPanel .legend{margin-top:2px}
.mapback .panel{background:#fffdf6}
@media(max-width:760px){.mapback .panel{max-width:460px;padding:20px 10px;max-height:calc(100dvh - 24px)}.mapback .atlas{max-height:none}.mapback .mapdesc{text-align:right}}
.overview-map{margin-top:0}



/* A quiet traditional-script colophon beneath a hairline, separate from navigation. */
.mapPanel .map-caption,.mapback .map-caption{width:72%;margin:20px auto 0;padding:12px 0 0;border-top:.5px solid #d5d2c638;font-family:'STKaiti','KaiTi','Kaiti SC','BiauKai','DFKai-SB','Songti TC',serif;font-size:11px;font-style:normal;font-weight:400;letter-spacing:.08em;line-height:1.8;color:#c4c1b8;white-space:nowrap;display:flex;align-items:center;justify-content:center;gap:8px}
@media(max-width:760px){.mapback .map-caption{width:80%;font-size:10.5px;margin-top:16px;padding-top:10px}}
.map-tool-icon{display:block;width:28px;height:28px;object-fit:contain;flex:0 0 auto}
.mapheading,.map-dialog-heading{align-items:center}
.map-dialog-heading{display:flex;gap:8px;min-width:0}
@media(max-width:760px){.art .strategy-art text,.art .systems-art text{font-size:15px}.art .strategy-art .model-detail,.art .systems-art .model-detail{font-size:12px}.strategy-map,.systems-map{min-width:240px}}

.caption-name{color:#b5bcab}.caption-diamond{flex:0 0 auto;width:3px;height:3px;border-radius:.4px .6px .35px .5px;background:#cfc7b2;transform:translateY(.5px) rotate(45deg);opacity:.45}.caption-site{font-family:Georgia,'Times New Roman',serif;font-size:9.5px;letter-spacing:.04em;color:#b5bcab;text-decoration:none;border-bottom:.5px solid transparent;transition:color .2s,border-color .2s}.caption-site:hover,.caption-site:focus-visible{color:#8a9683;border-bottom-color:#9fa89455;outline:none}

#desktopAtlas,#mobileAtlas{-webkit-touch-callout:none;user-select:none;-webkit-user-select:none;touch-action:pan-y pinch-zoom}
.map-export-status{position:fixed;z-index:20;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);padding:12px 18px;margin:0;border:1px solid var(--line);border-radius:14px;background:var(--white);color:var(--muted);font-size:13px;line-height:1.6;box-shadow:0 8px 30px #303b351a;pointer-events:none}.map-export-status[hidden]{display:none}
.map-download-menu{position:fixed;z-index:21;min-width:148px;padding:5px;border:1px solid var(--line);border-radius:12px;background:var(--white);box-shadow:0 8px 28px #303b3522}.map-download-menu[hidden]{display:none}.map-download-menu button{display:block;width:100%;padding:10px 16px;border:0;border-radius:8px;background:transparent;text-align:left;font:inherit;font-size:13px;line-height:1.6}.map-download-menu button:hover,.map-download-menu button:focus-visible{background:#edf0e7;outline:none}

/* Desktop reading desk: one frame, map as a quiet index beside the chapter. The 1px gap shows the frame colour as the divider. */
@media(min-width:761px){.layout{gap:1px;align-items:stretch;background:#e6e5d9;border:1px solid #6370682e;border-radius:24px;overflow:clip;box-shadow:0 16px 52px #2d393209}.layout>.panel{border:0;border-radius:0;box-shadow:none}.mapPanel{position:static;overflow:clip;display:flex;flex-direction:column}.mapPanel.is-pinned .map-sticky{position:sticky;top:20px}.map-track{flex:1;position:relative;display:flex;flex-direction:column}.map-sticky{position:relative;z-index:1;background:#fffdf6}.map-scenery{position:absolute;left:-16px;right:-16px;bottom:-18px;height:112px;pointer-events:none;-webkit-mask-image:linear-gradient(transparent,#000 48px);mask-image:linear-gradient(transparent,#000 48px)}.map-scenery[hidden]{display:none}.map-scenery[data-tier="2"]{height:160px}.map-scenery[data-tier="3"]{height:208px}.scenery-far,.scenery-sky{display:none}[data-tier="2"] .scenery-far,[data-tier="3"] .scenery-far,[data-tier="3"] .scenery-sky{display:inline}.map-scenery svg{display:block;width:100%;height:100%}.content{display:flex;flex-direction:column}.content .foot{margin-top:auto;padding-top:24px}}
/* 600-wide canvas at 360px keeps 26-unit node names near 15.6px, level with body text. */
@media(min-width:1000px){.topbar,.shell{width:min(1040px,calc(100% - 64px))}.topbar{padding:18px 0}.shell{padding-top:0}.hero{max-width:none;margin:0 0 20px;display:grid;grid-template-columns:auto minmax(300px,340px);align-items:center;justify-content:space-between;gap:4px 32px;text-align:left}.hero-star{display:none}h1{font-size:26px;margin:0}.hero-copy{font-size:14px;line-height:1.7}.book-search{grid-column:2;grid-row:1 / span 2;margin:0;max-width:none}.layout{grid-template-columns:392px minmax(0,1fr)}.mapPanel{padding:22px 16px 18px}.map-sticky{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;column-gap:10px}.mapPanel .mapdesc{margin:0;padding-right:6px}#desktopAtlas,.mapPanel .map-caption{grid-column:1 / -1}.content{padding:32px 44px 24px}.title{font-size:29px}.idea{font-size:17px}.bodytext,.thought{font-size:15px}}

.concept-table{border-top:1px solid #e6e5d9;padding-top:10px}.concept-table[hidden]{display:none}.concept-table table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.7}.concept-table th,.concept-table td{text-align:left;vertical-align:top;padding:8px 10px 8px 0;border-bottom:1px solid #eeeee4;font-weight:400}.concept-table thead th{font-size:12px;color:#a2a894;padding-top:4px}.concept-table tbody th{color:#596653;white-space:nowrap}.concept-table td{color:#7a8571}.concept-table tr>:last-child{padding-right:0}.concept-table tbody tr:last-child>*{border-bottom:0}@media(max-width:760px){.concept-table table{font-size:12px;line-height:1.6}.concept-table thead th{font-size:11px}.concept-table th,.concept-table td{padding:7px 8px 7px 0}.concept-table tbody th{white-space:normal;width:22%}}

@media(max-width:760px){.art .innovator-art text{font-size:15px}.art .innovator-art .model-detail{font-size:12px}.innovator-map{min-width:240px}}

/* Keep desktop section spacing on an 18px rhythm as revisits gain fuller examples. */
@media(min-width:761px){.content .idea{margin-bottom:18px}.content .smallhead:not(.modelhead){margin-top:18px}.content .thought{margin-top:18px;padding-top:14px}.content .foot{padding-top:18px}}

/* Trap mechanisms sit beside their own captions; retain the taller intrinsic canvas. */
.model-figure{margin:0}
.trap-figure .modelhead{display:block;margin:10px 0 16px;text-align:center;font-size:12px;font-weight:400;line-height:1.7}
.art svg.trap-art{height:auto;aspect-ratio:auto;max-width:440px;margin-inline:auto}

/* Keep the closing note on the same reading line as the chapter. */
.finale{margin-top:26px}
.finale[hidden],.finale-next[hidden]{display:none}
.finale-summary{display:grid;grid-template-columns:30px minmax(0,1fr);column-gap:10px;row-gap:4px;align-items:start}
.finale-mark{grid-row:1 / span 2;display:grid;justify-items:center;gap:3px}
.finale-label{color:#826634;font-size:13px;line-height:1.25;letter-spacing:.1em;font-family:'STKaiti','KaiTi','Kaiti SC',serif;white-space:nowrap}
.finale-insight{margin:0;font-size:20px;line-height:1.5;font-weight:650;color:var(--ink);overflow-wrap:anywhere}
.finale-insight span{display:inline-block;max-inline-size:100%}
.finale-thesis{grid-column:2;margin:0;font-size:14px;line-height:1.75;color:var(--muted);overflow-wrap:anywhere}
.finale-map{display:none;min-height:44px;margin-top:6px;padding:8px 0;border:0;border-radius:0;background:transparent;font-weight:600;color:var(--pine)}
.finale-map:hover,.finale-map:focus-visible{background:transparent;text-decoration:underline;text-underline-offset:3px}
.finale-next{display:grid;gap:3px;width:100%;margin-top:16px;padding:12px 0 0;border:0;border-top:1px solid var(--line);background:transparent;text-align:left}
.finale-next-heading{display:grid;grid-template-columns:max-content minmax(0,auto) auto;justify-content:start;align-items:baseline;gap:8px;color:var(--pine)}
.finale-next-label,.finale-next-reason{font-size:12px;line-height:1.7;color:var(--muted)}
.finale-next strong{font-size:15px;line-height:1.55;font-weight:600;overflow-wrap:anywhere}
.finale-next-heading > :last-child{align-self:center;display:flex}
.finale-next .icon{width:14px;height:14px}
.finale-next:hover strong,.finale-next:focus-visible strong{text-decoration:underline;text-underline-offset:3px}
@media(max-width:760px){.finale-insight{font-size:18px}.finale-map{display:inline-flex}.finale-next{margin-top:6px}}