:root{--bg:#f6f1e8;--paper:#fefcf7;--ink:#26241f;--soft:#57524a;--muted:#6b645a;--line:#d0c5b4;--green:#1f4a3a;--tint:#dfe6dc;--serif:"Songti SC", STSong, "Noto Serif SC", serif;--sans:"PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);font:17px/1.75 var(--sans);margin:0}a{color:var(--green);text-underline-offset:5px}button{font:inherit;cursor:pointer;color:inherit;background:0 0;border:0;min-height:44px}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--green);outline-offset:5px}h1:focus{outline:none}p{margin:0 0 20px}h1{font:500 clamp(32px, 3.5vw, 50px)/1.25 var(--serif);letter-spacing:-.025em;margin:0}strong{font-weight:600}.review-bar{border-bottom:1px solid var(--line);align-items:center;gap:24px;min-height:70px;padding:12px max(28px,50vw - 600px);display:flex}.identity{color:var(--ink);white-space:nowrap;font-family:Georgia,serif;font-size:20px;text-decoration:none}.identity span{color:var(--muted);font-size:16px}.experiment{color:var(--muted);margin-right:auto;font-size:13px}.review-bar button{border-bottom:1px solid var(--green);white-space:nowrap;font-size:14px}.scene-nav{border-bottom:1px solid var(--line);gap:28px;max-width:1200px;margin:auto;padding:12px 0;display:flex}.scene-nav a{color:var(--muted);align-items:center;gap:10px;min-height:44px;font-size:14px;text-decoration:none;display:flex}.scene-nav a[aria-current=step]{color:var(--green);box-shadow:inset 0 -2px var(--green);font-weight:600}.rag-intro main{max-width:1200px;margin:auto}.scene{padding:34px 0 0;scroll-margin-top:24px}.scene[hidden]{display:none}.eyebrow,.label{color:var(--muted);letter-spacing:.05em;font-size:13px}.eyebrow{margin:0 0 12px}.scene-heading{margin-bottom:34px}.scene-body{min-height:370px}.copy p{color:var(--soft)}.copy .lead,.lead{font:500 28px/1.55 var(--serif);color:var(--ink);margin-bottom:24px}.business,.game-intro,.first-game,.closing{grid-template-columns:1fr 1fr;align-items:start;gap:70px;display:grid}.business{padding-top:20px}.business-example{border-left:1px solid var(--line);padding:0 0 0 40px}blockquote{font:500 27px/1.6 var(--serif);margin:0 0 28px}.document-lines{border-block:1px solid var(--line);color:var(--soft);flex-wrap:wrap;gap:8px 22px;margin-bottom:26px;padding:18px 0;font-size:15px;display:flex}.gap{color:var(--soft);font-size:17px}.flow{border-bottom:1px solid var(--line);grid-template-columns:repeat(4,1fr);gap:32px;margin:0;padding:22px 0 32px;list-style:none;display:grid}.flow li{position:relative}.flow li:not(:last-child):after{content:"→";color:var(--muted);position:absolute;top:26px;right:-20px}.flow span,.flow strong,.flow small{display:block}.flow strong{margin:12px 0 8px;font-size:23px;line-height:1.5}.flow small{color:var(--muted);font-size:15px}.intro{color:var(--soft)}.hinge{margin-top:30px}.hinge .label{margin-bottom:12px}.hinge p:last-child{font:500 30px/1.6 var(--serif);color:var(--green)}.underline{text-underline-offset:7px;text-decoration:underline #a9b7a7}.game-figure{min-width:0;margin:0}.shot-link{display:block}.crop{background:#eee5d6;width:100%;position:relative;overflow:hidden}.crop img{width:100%;height:auto;display:block;position:absolute;left:0}.room{aspect-ratio:388/234}.room img{top:-99.57%}.entry{aspect-ratio:388/585;max-width:310px;margin:auto}.entry img{top:0}.ranking{aspect-ratio:388/572;max-width:328px;margin:auto}.ranking img{top:-132.17%}figcaption{color:var(--muted);margin-top:12px;font-size:12px;line-height:1.7}figcaption span{font-size:13px}.first-game figcaption,.closing figcaption{text-align:center}.mapping{margin:22px 0 0}.mapping div{border-top:1px solid var(--line);grid-template-columns:105px 1fr;gap:18px;padding:12px 0;display:grid}dt{font-size:16px;font-weight:600}dd{color:var(--soft);margin:0;font-size:15px;line-height:1.7}.boundary{color:var(--muted);border-left:2px solid var(--line);margin-top:28px;padding-left:18px;font-size:14px}.instructions{counter-reset:step;margin:24px 0;padding:0;list-style:none}.instructions li{border-top:1px solid var(--line);counter-increment:step;padding:12px 0 12px 40px;position:relative}.instructions li:before{content:counter(step, decimal-leading-zero);color:var(--muted);font-size:13px;position:absolute;top:12px;left:0}.instructions strong,.instructions span{display:block}.instructions span{color:var(--soft);margin-top:4px;font-size:15px}.small-note{font-size:14px;line-height:1.8;color:var(--muted)!important}.copy .insight{color:var(--green);border-top:1px solid var(--line);padding-top:20px;font-size:21px;line-height:1.65}.closing .lead{font-size:26px}.scene-footer{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:32px;margin-top:32px;padding:20px 0 24px;display:flex}.scene-footer p{color:var(--soft);margin:0;font-size:15px}.next{background:var(--green);color:var(--paper);white-space:nowrap;border-radius:3px;padding:10px 22px;font-size:15px}.footer-actions{flex-direction:column;align-items:flex-end;gap:12px;display:flex}.footer-actions a{font-size:13px}.review-only{line-height:1.7;color:var(--muted)!important;font-size:12px!important}.recap-continuation{border-top:1px dashed var(--line);margin-top:24px;padding-top:18px}.recap-continuation p{margin-bottom:12px}details{color:var(--soft);font-size:14px}summary{cursor:pointer;min-height:44px;color:var(--green);padding:8px 0}details ol{columns:2;padding-left:24px;line-height:2}details>p{font-size:12px}.review-bottom{border-top:1px solid var(--line);max-width:1200px;color:var(--muted);justify-content:space-between;align-items:center;margin:0 auto;padding:16px 0 25px;font-size:13px;display:flex}.review-bottom p{margin:0}.review-bottom button{font-size:13px}.review-bottom button:disabled{color:var(--muted);cursor:default}.mobile-break{display:none}.all-mode .scene{border-bottom:1px solid var(--line);margin-bottom:36px;padding-bottom:40px}.all-mode .scene-footer .next{color:var(--green);border:1px solid var(--line);background:0 0}.all-mode .review-bottom{display:none}@media (width>=701px){.game-intro .shot-link{max-width:460px}.first-game .entry{max-width:280px}#scene-4 .scene-footer{margin-top:24px;padding-top:16px;padding-bottom:16px}#scene-4 .footer-actions{gap:8px}}@media (hover:hover){.next:hover{background:#173a2d}a:hover{color:#173a2d}.scene-nav a:hover{color:var(--green)}}@media (width<=1260px){.rag-intro main,.scene-nav,.review-bottom{margin-inline:28px}.business,.game-intro,.first-game,.closing{gap:44px}.scene-nav{gap:22px}}@media (width<=700px){body{font-size:16px}.review-bar{flex-wrap:wrap;gap:12px;min-height:90px;padding:10px 20px}.identity{font-size:18px}.experiment{margin-left:auto;margin-right:0;font-size:11px}.review-bar button{text-align:left;min-height:32px;color:var(--green);border:0;flex-basis:100%;padding:0;font-size:13px}.rag-intro main,.scene-nav,.review-bottom{margin-inline:20px}.scene-nav{justify-content:space-between;gap:0;padding-block:6px}.scene-nav a{justify-content:center;width:42px;font-size:14px}.scene-nav a span{display:none}.scene{padding-top:24px}.scene-heading{margin-bottom:26px}.eyebrow{font-size:12px}h1{font-size:32px}.scene-body{min-height:0}.business,.game-intro,.first-game,.closing{grid-template-columns:1fr;gap:26px}.copy .lead,.lead{font-size:25px}.business{padding-top:0}.business-example{padding-left:20px}blockquote{font-size:23px}.flow{grid-template-columns:1fr;gap:22px;padding-top:12px;padding-bottom:24px}.flow li{border-left:1px solid var(--line);padding-left:25px}.flow li:not(:last-child):after{content:"↓";background:var(--bg);font-size:15px;inset:auto auto -27px 0}.flow strong{margin:4px 0;font-size:21px}.flow small{font-size:14px}.hinge p:last-child{font-size:25px}.mapping div{grid-template-columns:90px 1fr;gap:12px}.mapping dd{font-size:14px}.boundary{margin-top:20px}.first-game .game-figure{grid-row:2}.entry{max-width:310px}.scene-footer{flex-direction:column;align-items:stretch;gap:18px;margin-top:24px;padding-bottom:22px}.scene-footer .next{white-space:normal;text-align:center}.footer-actions{align-items:stretch}.footer-actions>a{text-align:right}.review-bottom{gap:12px}.review-bottom button{padding-inline:0}.mobile-break{display:block}details ol{columns:1}.all-mode .scene{margin-bottom:24px;padding-bottom:24px}.review-bar button{min-height:44px}}@media (prefers-reduced-motion:no-preference){.scene:not([hidden]) .scene-body{animation:.18s ease-out appear}@keyframes appear{0%{opacity:.6}to{opacity:1}}}@media print{.review-bar,.scene-nav,.review-bottom,.next,.footer-actions{display:none}.scene[hidden]{display:block}.scene{break-before:page}.scene:first-child{break-before:auto}.rag-intro main{margin:0}.scene-footer{display:block}}.rag-intro [hidden]{display:none!important}.screenshot-note{color:var(--muted);margin:18px 0;font-size:12px}.screenshot-note a{margin-left:12px}.review-bar{justify-content:space-between}.review-bar nav{gap:14px;font-size:12px;display:flex}.review-bar>a{font-size:13px}.rag-intro>main{max-width:1200px;margin-inline:auto}.scene-nav{flex-wrap:wrap}.scene-nav a,.scene-footer .next{white-space:normal}.rag-intro:lang(en){--serif:Georgia, serif;--sans:Inter, sans-serif}.rag-intro:lang(ja){--serif:"Yu Mincho", serif;--sans:"Hiragino Kaku Gothic ProN", sans-serif}@media (width<=1260px){.rag-intro>main{margin-inline:28px}}@media (width<=700px){.rag-intro>main{margin-inline:20px}.scene-nav a{gap:4px;width:auto;padding-inline:3px;font-size:12px}.scene-nav a span{display:inline}.review-bar nav{gap:10px}.review-bar{min-height:70px}.screenshot-note a{margin-top:8px;margin-left:0;display:block}}